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general description the max3222e/max3232e/max3237e/max3241e/ max3246e +3.0v-powered eia/tia-232 and v.28/v.24 communications interface devices feature low power con- sumption, high data-rate capabilities, and enhanced electrostatic-discharge (esd) protection. the enhanced esd structure protects all transmitter outputs and receiver inputs to ?5kv using iec 1000-4-2 air-gap discharge, ?kv using iec 1000-4-2 contact discharge (?kv for max3246e), and ?5kv using the human body model. the logic and receiver i/o pins of the max3237e are protected to the above standards, while the transmit- ter output pins are protected to ?5kv using the human body model. a proprietary low-dropout transmitter output stage delivers true rs-232 performance from a +3.0v to +5.5v power supply, using an internal dual charge pump. the charge pump requires only four small 0.1? capacitors for opera- tion from a +3.3v supply. each device guarantees opera- tion at data rates of 250kbps while maintaining rs-232 output levels. the max3237e guarantees operation at 250kbps in the normal operating mode and 1mbps in the megabaud operating mode, while maintaining rs-232- compliant output levels. the max3222e/max3232e have two receivers and two transmitters. the max3222e features a 1? shutdown mode that reduces power consumption in battery-pow- ered portable systems. the max3222e receivers remain active in shutdown mode, allowing monitoring of external devices while consuming only 1? of supply current. the max3222e and max3232e are pin, package, and func- tionally compatible with the industry-standard max242 and max232, respectively. the max3241e/max3246e are complete serial ports (three drivers/five receivers) designed for notebook and subnotebook computers. the max3237e (five drivers/ three receivers) is ideal for peripheral applications that require fast data transfer. these devices feature a shut- down mode in which all receivers remain active, while consuming only 1? (max3241e/max3246e) or 10na (max3237e). the max3222e, max3232e, and max3241e are avail- able in space-saving so, ssop, tqfn and tssop pack- ages. the max3237e is offered in an ssop package. the max3246e is offered in the ultra-small 6 x 6 ucsp package. next-generation device features ? ? for space-constrained applications max3228e/max3229e: 15kv esd-protected, +2.5v to +5.5v, rs-232 transceivers in ucsp ? ? for low-voltage or data cable applications max3380e/max3381e: +2.35v to +5.5v, 1 a, 2tx/2rx, rs-232 transceivers with 15kv esd-protected i/o and logic pins applications battery-powered equipment cell phones smart phones cell-phone data cables notebook, subnotebook, and palmtop computers printers xdsl modems 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers 19-1298; rev 12; 12/10 ordering information ordering information continued at end of data sheet. + denotes a lead(pb)-free/rohs-compliant package. * dice are tested at t a = +25?, dc parameters only. ** ep = exposed pad. /v denotes an automotive qualified part. pin configurations, selector guide, and typical operating circuits appear at end of data sheet. part temp range pin-package max3222e ctp+ 0c to +70c 20 tqfn-ep** (5mm x 5mm) max3222ecup+ 0c to +70c 20 tssop max3222ecap+ 0c to +70c 20 ssop max3222ecwn+ 0c to +70c 18 wide so max3222ecpn+ 0c to +70c 18 plastic dip max3222ec/d+ 0c to +70c dice* max3222eetp+ -40c to +85c 20 tqfn-ep** (5mm x 5mm) max3222eeup/v+ -40c to +85c 20 tssop max3222eeup+ -40c to +85c 20 tssop max3222eeap+ -40c to +85c 20 ssop max3222eewn+ -40c to +85c 18 wide so max3222eepn+ -40c to +85c 18 plastic dip max3232e cae+ 0c to +70c 16 ssop max3232ecwe+ 0c to +70c 16 wide so max3232ecpe+ 0c to +70c 16 plastic dip megabaud and ucsp are trademarks of maxim integrated products, inc. functional diagrams pin configurations appear at end of data sheet. functional diagrams continued at end of data sheet. ucsp is a trademark of maxim integrated products, inc. available evaluation kit available for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim?s website at www.maxim integrated.com. max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers absolute maximum ratings electrical characteristics (v cc = +3v to +5.5v, c1?4 = 0.1?, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (notes 3, 4) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. v cc to gnd ..............................................................-0.3v to +6v v+ to gnd (note 1) ..................................................-0.3v to +7v v- to gnd (note 1) ...................................................+0.3v to -7v v+ + |v-| (note 1).................................................................+13v input voltages t_in, en, shdn , mbaud to gnd ........................-0.3v to +6v r_in to gnd .....................................................................?5v output voltages t_out to gnd...............................................................?3.2v r_out, r_outb (max3237e/max3241e)...-0.3v to (v cc + 0.3v) short-circuit duration, t_out to gnd.......................continuous continuous power dissipation (t a = +70?) 16-pin ssop (derate 7.14mw/? above +70?) ..........571mw 16-pin tssop (derate 9.4mw/? above +70?) .......754.7mw 16-pin tqfn (derate 20.8mw/? above +70?) .....1666.7mw 16-pin wide so (derate 9.52mw/? above +70?) .....762mw 18-pin wide so (derate 9.52mw/? above +70?) .....762mw 18-pin pdip (derate 11.11mw/? above +70?)..........889mw 20-pin tqfn (derate 21.3mw/? above +70?) ........1702mw 20-pin tssop (derate 10.9mw/? above +70?) ........879mw 20-pin ssop (derate 8.00mw/? above +70?) ..........640mw 28-pin ssop (derate 9.52mw/? above +70?) ..........762mw 28-pin wide so (derate 12.50mw/? above +70?) .............1w 28-pin tssop (derate 12.8mw/? above +70?) ......1026mw 32-pin tqfn (derate 33.3mw/? above +70?)...........2666mw 6 x 6 ucsp (derate 12.6mw/? above +70?) .............1010mw operating temperature ranges max32_ _ec_ _ ...................................................0? to +70? max32_ _ee_ _.................................................-40? to +85? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) .......................................+260? bump reflow temperature (note 2) infrared, 15s..................................................................+200? vapor phase, 20s..........................................................+215? note 1: v+ and v- can have maximum magnitudes of 7v, but their absolute difference cannot exceed 13v. note 2: this device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device can be exposed to during board-level solder attach and rework. this limit permits only the use of the solder profiles recom- mended in the industry-standard specification, jedec 020a, paragraph 7.6, table 3 for ir/vpr and convection reflow. preheating is required. hand or wave soldering is not allowed. parameter conditions min typ max units dc characteristics (v cc = +3.3v or +5v, t a = +25c) max3222e, max3232e, max3241e, max3246e 0.3 1 supply current shdn = v cc , no load max3237e 0.5 2.0 ma shdn = gnd 1 10 a shutdown supply current shdn = r_in = gnd, t_in = gnd or v cc (max3237e) 10 300 na logic inputs input logic low t_in, en , shdn , mbaud 0.8 v v cc = +3.3v 2.0 input logic high t_in, en , shdn , mbaud v cc = +5.0v 2.4 v transmitter input hysteresis 0.5 v t_in, en , shdn max3222e, max3232e, max3241e, max3246e 0.01 1 input leakage current t_in, shdn , mbaud max3237e (note 5) 9 18 a 2 maxim integrated max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers electrical characteristics (continued) (v cc = +3v to +5.5v, c1?4 = 0.1?, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (notes 3, 4) parameter conditions min typ max units receiver outputs output leakage current r_out (max3222e/max3237e/max3241e/ max3246e), en = v cc , receivers disabled 0.05 10 a output-voltage low i out = 1.6ma (max3222e/max3232e/max3241e/ max3246e), i out = 1.0ma (max3237e) 0.4 v output-voltage high i out = -1.0ma v cc - 0.6 v cc - 0.1 v receiver inputs input voltage range -25 +25 v v cc = +3.3v 0.6 1.1 input threshold low t a = +25c v cc = +5.0v 0.8 1.5 v v cc = +3.3v 1.5 2.4 input threshold high t a = +25c v cc = +5.0v 2.0 2.4 v input hysteresis 0.5 v input resistance t a = +25c 3 5 7 k transmitter outputs output voltage swing all transmitter outputs loaded with 3k to ground (note 6) 5 5.4 v output resistance v cc = 0v, transmitter output = 2v 300 50k output short-circuit current 60 ma output leakage current v cc = 0v or +3.0v to +5.5v, v out = 12v, transmitters disabled (max3222e/max3232e/max3241e/max3246e) 25 a mouse drivability (max3241e) transmitter output voltage t1in = t2in = gnd, t3in = v cc , t3out loaded with 3k to gnd, t1out and t2out loaded with 2.5ma each 5 v esd protection human body model 15 iec 1000-4-2 air-gap discharge (except max3237e) 15 iec 1000-4-2 contact discharge (except max3237e) 8 r_in, t_out iec 1000-4-2 contact discharge (max3246e only) 9 kv human body model 15 iec 1000-4-2 air-gap discharge 15 t_in, r_in, r_out, en , shdn , mbaud max3237e iec 1000-4-2 contact discharge 8 kv maxim integrated 3 max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers timing characteristics?max3237e (v cc = +3v to +5.5v, c1?c4 = 0.1f, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) (note 3) note 3: max3222e/max3232e/max3241e: c1?c4 = 0.1f tested at +3.3v 10%; c1 = 0.047f, c2, c3, c4 = 0.33f tested at +5.0v 10%. max3237e: c1?c4 = 0.1f tested at +3.3v 5%, c1?c4 = 0.22f tested at +3.3v 10%; c1 = 0.047f, c2, c3, c4 = 0.33f tested at +5.0v 10%. max3246e: c1-c4 = 0.22f tested at +3.3v 10%; c1 = 0.22f, c2, c3, c4 = 0.54f tested at +5.0v 10%. note 4: max3246e devices are production tested at +25c. all limits are guaranteed by design over the operating temperature range. note 5: the max3237e logic inputs have an active positive feedback resistor. the input current goes to zero when the inputs are at the supply rails. note 6: max3241eeui is specified at t a = +25c. transmitter skew is measured at the transmitter zero crosspoints. parameter conditions min typ max units r l = 3k, c l = 1000pf, one transmitter switching, mbaud = gnd 250 v cc = +3.0v to +4.5v, r l = 3k, c l = 250pf, one transmitter switching, mbaud = v cc 1000 maximum data rate v cc = +4.5v to +5.5v, r l = 3k, c l = 1000pf, one transmitter switching, mbaud = v cc 1000 kbps t phl 0.15 receiver propagation delay r_in to r_out, c l = 150pf t plh 0.15 ? receiver output enable time normal operation 2.6 ? receiver output disable time normal operation 2.4 ? |t phl - t plh |, mbaud = gnd transmitter skew (note 7) |t phl - t plh |, mbaud = v cc 100 ns receiver skew |t phl - t plh |5 0 n s mbaud = gnd 6 30 c l = 150pf to 1000pf mbaud = v cc 24 150 v cc = +3.3v, r l = 3k to 7k , +3.0v to -3.0v or -3.0v to +3.0v, t a = +25? c l = 150pf to 2500pf, mbaud = gnd 43 0 v/? transition-region slew rate timing characteristicsmax3222e/max3232e/max3241e/max3246e (v cc = +3v to +5.5v, c1?4 = 0.1?, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (notes 3, 4) parameter symbol conditions min typ max units t a = t min to t max (max3222e/max3232e/ max3241e) (note 6) 250 maximum data rate r l = 3k, c l = 1000pf, one transmitter switching t a = + 25c ( m ax 3246e ) 250 kbps t phl 0.15 receiver propagation delay t plh receiver input to receiver output, c l = 150pf 0.15 ? receiver output enable time normal operation (except max3232e) 200 ns receiver output disable time normal operation (except max3232e) 200 ns transmitter skew |t phl - t plh | (note 7) 100 ns receiver skew |t phl - t plh |5 0 n s transition-region slew rate v c c = + 3.3v , t a = + 25c , r l = 3k to 7k , m easur ed fr om + 3.0v to - 3.0v or - 3.0v to + 3.0v , one tr ansm i tter sw i tchi ng c l = 150pf to 1000pf 6 30 v/? 4 maxim integrated max3222e/max3232e/max3237e/ max3241e/max3246e
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 0 1000 2000 3000 4000 5000 max3222e/max3232e transmitter output voltage vs. load capacitance max3237e toc01 load capacitance (pf) transmitter output voltage (v) t1 transmitting at 250kbps t2 transmitting at 15.6kbps v out+ v out- 0 6 2 4 10 8 14 12 16 0 1000 2000 3000 4000 5000 max3222e/max3232e slew rate vs. load capacitance max3237e toc02 load capacitance (pf) slew rate (v/s) +slew for data rates up to 250kbps -slew 0 25 20 15 5 10 35 30 40 45 0 2000 1000 3000 4000 5000 max3222e/max3232e operating supply current vs. load capacitance max3237e toc03 load capacitance (pf) supply current (ma) 250kbps 120kbps 20kbps t1 transmitting at 250kbps t2 transmitting at 15.6kbps 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers -6 -4 -2 0 2 4 6 0 max3237e transmitter output voltage vs. load capacitance (mbaud = gnd) max3237e toc07 load capacitance (pf) transmitter output voltage (v) 1000 1500 500 2000 2500 3000 for data rates up to 250kbps 1 transmitter at 250kbps 4 transmitters at 15.6kbps all transmitters loaded with 3k + c l 5 3 1 -1 -3 -5 v out+ v out- -6 -2 -4 2 0 4 6 -5 -3 1 -1 3 5 0 1000 1500 500 2000 2500 3000 max3246e toc07a load capacitance (pf) transmitter output voltage (v) v out- v out + for data rates up to 250kbps 1 transmitter 250kbps 4 transmitters 15.6kbps all transmitters loaded with 3k + c l max3237e transmitter output voltage vs. load capacitance -7.5 -5.0 -2.5 0 2.5 5.0 7.5 0 max3237e transmitter output voltage vs. load capacitance (mbaud = v cc ) max3237e toc08 load capacitance (pf) transmitter output voltage (v) 500 1000 1500 2000 1 transmitter at full data rate 4 transmitters at 1/16 data rate 3k + c l load, each output 2mbps 1.5mbps 1mbps 2mbps 1mbps 1.5mbps __________________________________________typical operating characteristics (v cc = +3.3v, 250kbps data rate, 0.1? capacitors, all transmitters loaded with 3k and c l , t a = +25?, unless otherwise noted.) -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 0 1000 2000 3000 4000 5000 max3241e transmitter output voltage vs. load capacitance max3237e to04 load capacitance (pf) transmitter output voltage (v) 1 transmitter at 250kbps 2 transmitters at 15.6kbps v out+ v out- 0 30 20 10 40 50 60 0 2000 1000 3000 4000 5000 max3241e operating supply current vs. load capacitance max3237e toc06 load capacitance (pf) supply current (ma) 250kbps 120kbps 20kbps 1 transmitter at 250kbps 2 transmitters at 15.6kbps 0 4 2 8 6 12 10 14 0 1000 2000 3000 4000 5000 max3241e slew rate vs. load capacitance max3237e toc05 load capacitance (pf) slew rate (v/s) maxim integrated 5 max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers typical operating characteristics (continued) (v cc = +3.3v, 250kbps data rate, 0.1? capacitors, all transmitters loaded with 3k and c l , t a = +25?, unless otherwise noted.) 0 20 60 40 80 100 0 max3237e transmitter skew vs. load capacitance (mbaud = v cc ) max3237e toc12 load capacitance (pf) 1000 1500 500 2000 transmitter skew (ns) |t plh - t phl | 1 transmitter at 500kbps 4 transmitters at 1/16 data rate all transmitters loaded with 3k + c l -6 -2 -4 2 0 4 6 -3 -5 1 -1 3 5 2.0 3.0 3.5 2.5 4.0 4.5 5.0 max3237e toc13 supply voltage (v) transmitter output voltage (v) v out- v out + 1 transmitter at 250kbps 4 transmitters at 15.6kbps all transmitters loaded with 3k + 1000pf max3237e transmitter output voltage vs. supply voltage (mbaud = gnd) 0 10 20 30 40 50 2.0 max3237e supply current vs. supply voltage (mbaud = gnd) max3237e toc14 supply voltage (v) supply current (ma) 3.0 3.5 2.5 4.0 4.5 5.0 1 transmitter at 250kbps 4 transmitters at 15.6kbps all transmitters loaded with 3k and 1000pf max3246e transmitter output voltage vs. load capacitance max3237e toc15 load capacitance (pf) transmitter output voltage (v) 4000 3000 1000 2000 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 -6 0 5000 1 transmitter at 250kbps 2 transmitters at 15.6kbps v out- v out+ 4 6 8 10 12 14 16 0 max3246e slew rate vs. load capacitance max3237e toc16 load capacitance (pf) slew rate (v/s) 2000 3000 1000 4000 5000 sr+ sr- 0 10 20 30 40 50 60 0 max3246e operating supply current vs. load capacitance max3237e toc17 load capacitance (pf) supply current (ma) 1000 2000 3000 4000 5000 1 transmitter at 250kbps 2 transmitters at 15.6kbps 55 45 35 25 15 5 250kbps 120kbps 20kbps 0 2 4 6 8 10 12 0 max3237e slew rate vs. load capacitance (mbaud = gnd) max3237e toc09 load capacitance (pf) slew rate (v/s) 1000 1500 500 2000 2500 3000 sr+ sr- 1 transmitter at 250kbps 4 transmitters at 15.6kbps all transmitters loaded with 3k + c l 0 10 20 30 50 40 60 70 0 max3237e slew rate vs. load capacitance (mbaud = v cc ) max3237e toc10 load capacitance (pf) slew rate (v/s) 500 1000 1500 2000 -slew, 1mbps +slew, 1mbps 1 transmitter at full data rate 4 transmitters at 1/16 data rate 3k + c l load each output -slew, 2mbps +slew, 2mbps 0 10 20 30 40 50 0 max3237e supply current vs. load capacitance when transmitting data (mbaud = gnd) max3237e toc11 load capacitance (pf) supply current (ma) 1000 1500 500 2000 2500 3000 250kbps 120kbps 20kbps 1 transmitter at 20kbps, 120kbps, 250kbps 4 transmitters at 15.6kbps all transmitters loaded with 3k + c l 6 maxim integrated max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers * these pins have an active positive feedback resistor internal to the max3237e, allowing unused inputs to be left unconnected. pin description pin max3222e max3232e max3241e tqfn so/ dip tssop/ ssop tqfn so/dip/ ssop/ 16-pin tssop 20-pin tssop max3237e ssop/ so/ tssop tqfn max3246e name function 19 1 1 13* 23 22 b3 en receiver enable. active low. 1 2 2 16 1 2 28 28 28 f3 c1+ positive terminal of voltage-doubler charge- pump capacitor 20 3 3 15 2 3 27 27 27 f1 v+ +5.5v generated by the charge pump 2 4 4 1 3 4 25 24 23 f4 c1- negative terminal of voltage-doubler charge- pump capacitor 3 5 5 2 4 5 1 1 29 e1 c2+ positive terminal of inverting charge-pump capacitor 4 6 6 3 5 6 3 2 30 d1 c2- negative terminal of inverting charge-pump capacitor 5 7 7 4 6 7 4 3 31 c1 v- -5.5v generated by the charge pump 6, 15 8, 15 8, 17 5, 12 7, 14 8, 17 5, 6, 7, 10, 12 9, 10, 11 6, 7, 8 f6, e6, d6 t_out rs-232 transmitter outputs 7, 14 9, 14 9, 16 6, 11 8, 13 9, 16 8, 9, 11 4? 1? a4, a5, a6, b6, c6 r_in rs-232 receiver inputs 8, 13 10, 13 10, 15 7, 10 9, 12 12, 15 18, 20, 21 15?9 13, 14, 15, 17, 18 c2, b1, a1, a2, a3 r_out ttl/cmos receiver outputs 10, 11 11, 12 12, 13 8, 9 10, 11 13, 14 17*, 19*, 22*, 23*, 24* 12, 13, 14 10, 11, 12 e3, e2, d2 t_in ttl/cmos transmitter inputs maxim integrated 7 max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers pin description (continued) pin max3222e max3232e max3241e tqfn so/ dip tssop/ ssop tqfn so/dip/ ssop/ 16-pin tssop 20-pin tssop max3237e ssop/ so/ tssop tqfn max3246e name function 16 16 18 13 15 18 2 25 24 f5 gnd ground 17 17 19 14 16 19 26 26 26 f2 v cc +3.0v to +5.5v supply voltage 18 18 20 14* 22 21 b2 shdn shutdown control. active low. 9, 12 11, 14 1, 10, 11, 20 9, 16, 25, 32 c3, d3, b4, c4, d4, e4, b5, c5, d5, e5 n.c. no connection. for max3246e, these locations are not populated with solder bumps. 15* mbaud megabaud control input. connect to gnd for normal operation; connect to v cc for 1mbps transmission rates. 16 20, 21 19, 20 r_outb noninverting complementary receiver outputs. always active. ep exposed pad. solder the exposed pad to the ground plane or leave unconnected (for tqfn only). 8 maxim integrated max3222e/max3232e/max3237e/ max3241e/max3246e
detailed description dual charge-pump voltage converter the max3222e/max3232e/max3237e/max3241e/ max3246e? internal power supply consists of a regu- lated dual charge pump that provides output voltages of +5.5v (doubling charge pump) and -5.5v (inverting charge pump) over the +3.0v to +5.5v v cc range. the charge pump operates in discontinuous mode; if the output voltages are less than 5.5v, the charge pump is enabled, and if the output voltages exceed 5.5v, the charge pump is disabled. each charge pump requires a flying capacitor (c1, c2) and a reservoir capacitor (c3, c4) to generate the v+ and v- supplies (figure 1). rs-232 transmitters the transmitters are inverting level translators that con- vert ttl/cmos-logic levels to ?v eia/tia-232-compli- ant levels. the max3222e/max3232e/max3237e/max3241e/ max3246e transmitters guarantee a 250kbps data rate with worst-case loads of 3k in parallel with 1000pf, providing compatibility with pc-to-pc communication software (such as laplink). transmitters can be par- alleled to drive multiple receivers or mice. the max3222e/max3237e/max3241e/max3246e transmitters are disabled and the outputs are forced into a high-impedance state when the device is in shut- down mode (shdn = gnd). the max3222e/ max3232e/max3237e/max3241e/max3246e permit the outputs to be driven up to ?2v in shutdown. the max3222e/max3232e/max3241e/max3246e transmitter inputs do not have pullup resistors. connect unused inputs to gnd or v cc . the max3237e? trans- mitter inputs have a 400k active positive-feedback resistor, allowing unused inputs to be left unconnected. max3237e megabaud operation for higher-speed serial communications, the max3237e features megabaud operation. in megabaud operating mode (mbaud = v cc ), the max3237e transmitters guarantee a 1mbps data rate with worst-case loads of 3k in parallel with 250pf for +3.0v < v cc < +4.5v. for +5v ?0% operation, the max3237e transmitters guarantee a 1mbps data rate into worst-case loads of 3k in parallel with 1000pf. rs-232 receivers the receivers convert rs-232 signals to cmos-logic output levels. the max3222e/max3237e/max3241e/ max3246e receivers have inverting three-state outputs. drive en high to place the receiver(s) into a high- impedance state. receivers can be either active or inactive in shutdown (table 1). max3222e max3232e max3237e max3241e max3246e 5k r_ in r_ out c2- c2+ c1- c1+ v- v+ v cc c4 c3 c1 c2 0.1f v cc t_ out t_ in gnd 7k 150pf max3222e max3232e max3237e max3241e max3246e 5k r_ in r_ out c2- c2+ c1- c1+ v- v+ v cc c4 c3 c1 c2 0.1f v cc t_ out t_ in gnd 3k 1000pf (2500pf, max3237e only) minimum slew-rate test circuit maximum slew-rate test circuit figure 1. slew-rate test circuits 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers laplink is a trademark of traveling software. maxim integrated 9 max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers the complementary outputs on the max3237e/ max3241e (r_outb) are always active, regardless of the state of en or shdn. this allows the device to be used for ring indicator applications without forward biasing other devices connected to the receiver outputs. this is ideal for systems where v cc drops to zero in shutdown to accommodate peripherals such as uarts (figure 2). max3222e/max3237e/max3241e/ max3246e shutdown mode supply current falls to less than 1? in shutdown mode ( shdn = low). the max3237e? supply current falls to10na (typ) when all receiver inputs are in the invalid range (-0.3v < r_in < +0.3v). when shut down, the device? charge pumps are shut off, v+ is pulled down to v cc , v- is pulled to ground, and the transmitter out- puts are disabled (high impedance). the time required to recover from shutdown is typically 100?, as shown in figure 3. connect shdn to v cc if shutdown mode is not used. shdn has no effect on r_out or r_outb (max3237e/max3241e). 15kv esd protection as with all maxim devices, esd-protection structures are incorporated to protect against electrostatic dis- charges encountered during handling and assembly. the driver outputs and receiver inputs of the max3222e/max3232e/max3237e/max3241e/max3246e have extra protection against static electricity. maxim? engineers have developed state-of-the-art structures to protect these pins against esd of ?5kv without damage. the esd structures withstand high esd in all states: normal operation, shutdown, and powered down. after an esd event, maxim? e versions keep working without latchup, whereas competing rs-232 products can latch and must be powered down to remove latchup. furthermore, the max3237e logic i/o pins also have ?5kv esd protection. protecting the logic i/o pins to ?5kv makes the max3237e ideal for data cable applications. t1out r1outb tx 5k uart v cc t1in logic transition detector r1in r1out three-stated en = v cc shdn = gnd v cc to p rx previous rs-232 tx uart protection diode protection diode shdn = gnd v cc v cc gnd rx 5k a) older rs-232: powered-down uart draws current from a a active receiver output in shutdown. b) new max3237e/max3241e: en shuts down receiver outputs b (except for b outputs), so no current flows to uart in shutdown. b b outputs indicate receiver activity during shutdown with en high. gnd max3237e/max3241e figure 2. detection of rs-232 activity when the uart and interface are shut down; comparison of max3237e/max3241e (b) with previous transceivers (a) 40s/div shdn t2out t1out 5v/div 0 2v/div 0 v cc = 3.3v c1?c4 = 0.1f figure 3. transmitter outputs recovering from shutdown or powering up 10 maxim integrated max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers esd protection can be tested in various ways; the transmitter outputs and receiver inputs for the max3222e/max3232e/max3241e/max3246e are characterized for protection to the following limits: ?5kv using the human body model ?kv using the contact discharge method specified in iec 1000-4-2 ?kv (max3246e only) using the contact discharge method specified in iec 1000-4-2 ?5kv using the air-gap discharge method speci- fied in iec 1000-4-2 charge-current- limit resistor discharge resistance storage capacitor c s 100pf r c 1m r d 1500 high- voltage dc source device- under- test figure 4a. human body esd test model i p 100% 90% 36.8% t rl time t dl current waveform peak-to-peak ringing (not drawn to scale) i r 10% 0 0 amperes figure 4b. human body model current waveform charge-current- limit resistor discharge resistance storage capacitor c s 150pf r c 50m to 100m r d 330 high- voltage dc source device- under- test figure 5a. iec 1000-4-2 esd test model t r = 0.7ns to 1ns 30ns 60ns t 100% 90% 10% i peak i figure 5b. iec 1000-4-2 esd generator current waveform table 1. max3222e/max3237e/max3241e/ max3246e shutdown and enable control truth table shdn en t_out r_out r_outb (max3237e/ max3241e) 0 0 high impedance active active 0 1 high impedance high impedance active 1 0 active active active 1 1 active high impedance active maxim integrated 11 max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers for the max3237e, all logic and rs-232 i/o pins are characterized for protection to ?5kv per the human body model. esd test conditions esd performance depends on a variety of conditions. contact maxim for a reliability report that documents test setup, test methodology, and test results. human body model figure 4a shows the human body model, and figure 4b shows the current waveform it generates when dis- charged into a low impedance. this model consists of a 100pf capacitor charged to the esd voltage of interest, which is then discharged into the test device through a 1.5k resistor. iec 1000-4-2 the iec 1000-4-2 standard covers esd testing and performance of finished equipment; it does not specifi- cally refer to integrated circuits. the max3222e/ max3232e/max3237e/max3241e/max3246e help you design equipment that meets level 4 (the highest level) of iec 1000-4-2, without the need for additional esd- protection components. the major difference between tests done using the human body model and iec 1000-4-2 is higher peak current in iec 1000-4-2, because series resistance is lower in the iec 1000-4-2 model. hence, the esd with- stand voltage measured to iec 1000-4-2 is generally lower than that measured using the human body model. figure 5a shows the iec 1000-4-2 model, and figure 5b shows the current waveform for the ?kv iec 1000-4-2 level 4 esd contact discharge test. the air- gap discharge test involves approaching the device with a charged probe. the contact discharge method connects the probe to the device before the probe is energized. machine model the machine model for esd tests all pins using a 200pf storage capacitor and zero discharge resis- tance. its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. all pins require this protection during manufacturing, not just rs-232 inputs and outputs. therefore, after pc board assembly, the machine model is less relevant to i/o ports. table 2. required minimum capacitor values -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 012345678910 max3222e-fig06a load current per transmitter (ma) transmitter output voltage (v) v out+ v out- v out+ v out- v cc v cc = 3.0v figure 6a. max3241e transmitter output voltage vs. load current per transmitter table 3. logic-family compatibility with various supply voltages v cc (v) c1 (f) c2, c3, c4 (f) max3222e/max3232e/max3241e 3.0 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.1 0.47 max3237e/max3246e 3.0 to 3.6 0.22 0.22 3.15 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.22 1.0 system power-supply voltage (v) v cc supply voltage (v) compatibility 3.3 3.3 compatible with all cmos families 55 compatible with all ttl and cmos families 5 3.3 c om p ati b l e w i th ac t and h c t c m os , and w i th ac , h c , or c d 4000 c m o s 12 maxim integrated max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers applications information capacitor selection the capacitor type used for c1?4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. the charge pump requires 0.1? capaci- tors for 3.3v operation. for other supply voltages, see table 2 for required capacitor values. do not use val- ues smaller than those listed in table 2. increasing the capacitor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. c2, c3, and c4 can be increased without changing c1? value. however, do not increase c1 without also increasing the values of c2, c3, c4, and c bypass to maintain the proper ratios (c1 to the other capacitors). when using the minimum required capacitor values, make sure the capacitor value does not degrade excessively with temperature. if in doubt, use capaci- tors with a larger nominal value. the capacitor? equiv- alent series resistance (esr), which usually rises at low temperatures, influences the amount of ripple on v+ and v-. power-supply decoupling in most circumstances, a 0.1? v cc bypass capacitor is adequate. in applications sensitive to power-supply noise, use a capacitor of the same value as charge- pump capacitor c1. connect bypass capacitors as close to the ic as possible. operation down to 2.7v transmitter outputs meet eia/tia-562 levels of ?.7v with supply voltages as low as 2.7v. max3241e en 23 r5out 15 r4out 16 r3out 17 r2out 18 r1out 19 r2outb 20 r1outb 21 5k 5k 5k 5k 5k r5in 8 v cc r4in 7 6 r2in 5 r1in 4 shdn 22 gnd 25 t3in 12 t2in 13 t1in 14 c2- 2 c2+ 1 c1- 24 c1+ 28 t3out 11 +v computer serial port +v -v gnd tx t2out 10 t1out 9 v- 3 v+ 27 v cc v cc c4 c3 c1 c2 c bypass v cc = +3.0v to +5.5v 26 r3in mouse figure 6b. mouse driver test circuit maxim integrated 13 max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers figure 7. loopback test circuit 2s/div t1in t1out r1out 5v/div 5v/div 5v/div v cc = 3.3v c1?c4 = 0.1f figure 8. max3241e loopback test result at 120kbps 2s/div t1in t1out r1out 5v/div 5v/div 5v/div v cc = 3.3v, c1?c4 = 0.1f figure 9. max3241e loopback test result at 250kbps +5v 0 +5v 0 -5v +5v 0 t_in t_out 5k + 250pf r_out 400ns/div v cc = 3.3v c1?c4 = 0.1f figure 10. max3237e loopback test result at 1000kbps (mbaud = v cc ) max3222e max3232e max3237e max3241e max3246e 5k r_ in r_ out c2- c2+ c1- c1+ v- v+ v cc c4 c3 c1 c2 0.1f v cc t_ out t_ in gnd 1000pf transmitter outputs recovering from shutdown figure 3 shows two transmitter outputs recovering from shutdown mode. as they become active, the two trans- mitter outputs are shown going to opposite rs-232 levels (one transmitter input is high; the other is low). each transmitter is loaded with 3k in parallel with 2500pf. the transmitter outputs display no ringing or undesir- able transients as they come out of shutdown. note that the transmitters are enabled only when the magnitude of v- exceeds approximately -3.0v. mouse drivability the max3241e is designed to power serial mice while operating from low-voltage power supplies. it has been tested with leading mouse brands from manu- facturers such as microsoft and logitech. the max3241e successfully drove all serial mice tested and met their current and voltage requirements. 14 maxim integrated max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers figure 6a shows the transmitter output voltages under increasing load current at +3.0v. figure 6b shows a typical mouse connection using the max3241e. high data rates the max3222e/max3232e/max3237e/max3241e/ max3246e maintain the rs-232 ?v minimum transmit- ter output voltage even at high data rates. figure 7 shows a transmitter loopback test circuit. figure 8 shows a loopback test result at 120kbps, and figure 9 shows the same test at 250kbps. for figure 8, all trans- mitters were driven simultaneously at 120kbps into rs- 232 loads in parallel with 1000pf. for figure 9, a single transmitter was driven at 250kbps, and all transmitters were loaded with an rs-232 receiver in parallel with 1000pf. the max3237e maintains the rs-232 ?.0v minimum transmitter output voltage at data rates up to 1mbps. figure 10 shows a loopback test result at 1mbps with mbaud = v cc . for figure 10, all transmitters were loaded with an rs-232 receiver in parallel with 250pf. interconnection with 3v and 5v logic the max3222e/max3232e/max3237e/max3241e/ max3246e can directly interface with various 5v logic families, including act and hct cmos. see table 3 for more information on possible combinations of inter- connections. ucsp reliability the ucsp represents a unique packaging form factor that may not perform equally to a packaged product through traditional mechanical reliability tests. ucsp reliability is integrally linked to the user? assembly methods, circuit board material, and usage environ- ment. the user should closely review these areas when considering use of a ucsp package. performance through operating life test and moisture resistance remains uncompromised as the wafer-fabrication process primarily determines it. mechanical stress performance is a greater considera- tion for a ucsp package. ucsps are attached through direct solder contact to the user? pc board, foregoing the inherent stress relief of a packaged product lead frame. solder joint contact integrity must be consid- ered. table 4 shows the testing done to characterize the ucsp reliability performance. in conclusion, the ucsp is capable of performing reliably through envi- ronmental stresses as indicated by the results in the table. additional usage data and recommendations are detailed in application note 1891: wafer-level packaging (wlp) and its applications . table 4. reliability test data test conditions duration failures per sample size temperature cycle t a = -35? to +85?, t a = -40? to +100? 150 cycles, 900 cycles 0/10, 0/200 operating life t a = +70? 240 hours 0/10 moisture resistance t a = +20? to +60?, 90% rh 240 hours 0/10 low-temperature storage t a = -20? 240 hours 0/10 low-temperature operational t a = -10? 24 hours 0/10 solderability 8-hour steam age 0/15 esd 15kv, human body model 0/5 high-temperature operating life t j = +150? 168 hours 0/45 maxim integrated 15 max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers __________________________________________________________pin configurations 20 19 18 17 16 15 14 13 1 2 3 8 12 11 10 4 5 6 7 shdn v cc gnd t1out c1- v+ c1+ en r1in r1out t1in t2in t2out v- c2- c2+ 9 r2in r2out tssop/ssop n.c. n.c. max3222e 20 19 18 17 16 15 14 13 1 2 3 8 12 11 10 4 5 6 7 n.c. v cc gnd t1out c1- v+ c1+ n.c. r1in r1out t2in r2out t2out v- c2- c2+ 9 r2in n.c. tssop t1in n.c. max3232e 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 v cc gnd t1out r1in c2+ c1- v+ c1+ max3232e r1out t1in t2in r2out r2in t2out v- c2- so/dip/ssop/tssop 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 c1+ v+ v cc gnd c1- en r5out shdn r1outb r2outb r1out r2out r3out r4out t1in t2in t3in t3out t2out t1out r5in r4in r3in r2in r1in v- c2- c2+ ssop/so/tssop tqfn max3241e top view 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 c1+ v+ v cc c1- t1in t2in mbaud t3in r1out r2out t4in r3out t5in r1outb shdn en t5out r3in t4out r2in r1in t3out t2out t1out v- c2- gnd c2+ ssop max3237e 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 shdn v cc gnd t1out c1- v+ c1+ en r1in r1out t1in t2in t2out v- c2- c2+ 10 9 r2out r2in so/dip max3222e 32 31 30 29 28 27 26 n.c. v- c2- c2+ c1+ v+ v cc 25 n.c. 9 10 11 12 13 14 15 n.c. t3in t2in t1in r5out r4out r3out 16 n.c. 17 18 19 20 21 22 23 r2out r1out r2outb r1outb shdn en c1- 8 7 6 5 4 3 2 t3out *ep *connect ep to gnd. t2out t1out r5in r4in r3in r2in max3241e 1r1in 24 gnd top view + + + + ++ + 16 maxim integrated max3222e/max3232e/max3237e/ max3241e/max3246e
pin configurations (continued) 19 20 18 17 7 6 8 c1- c2- v- 9 c1+ r1in n.c. t1in t1out 12 shdn 45 15 14 12 11 en v+ *ep n.c. r2out r2in t2out max3222e c2+ r1out 3 13 v cc 16 10 t2in gnd tqfn *ep top view 15 16 14 13 6 5 7 c2+ v- 8 c1- r1in t1in t1out 12 v cc 4 12 11 9 v+ c1+ t2in r2out r2in t2out max3232e c2- r1out 3 10 gnd tqfn top view ++ 15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers ucsp f6f5f4f3f2 e6 e3 d6 c6 b6 b3 a2 a3 a4 a5 a6 top view (bumps on bottom) t1out gnd c1-c1+ v cc r3in r2in r1in r5out r4out r4in r5in t3out t2out b2: shdn c2: r1out d2: t3in e2: t2in b3: en e3: t1in *connect ep to gnd. bumps b4, b5, c3, c4, c5, d3, d4, d5, e4, and e5 not populated e2 d2 c2 b2 f1 e1 d1 c1 b1 a1 v+ r3out r2out v- c2- c2+ max3246e + maxim integrated 17 max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers __________________________________________________typical operating circuits r2out10 1 r1out13 r2in 9 18 gnd 16 rs-232 outputs ttl/cmos inputs t2in 11 t1in 12 c2- 6 c2+ 5 c1- 4 c1+ 2 r1in 14 t2out 8 t1out 15 v- 7 v+ 3 v cc 17 c1 0.1f c2 0.1f c bypass +3.3v rs-232 inputs ttl/cmos outputs 5k 5k en shdn c3 * 0.1f c4 0.1f note: pin numbers refer to so/dip packages. max3222e pinout refers to so/dip packages. max3232e pinout refers to tssop/ssop/so/dip packages * c3 can be returned to either v cc or ground. r2out9 r1out12 r2in 8 gnd 15 rs-232 outputs ttl/cmos inputs t2in 10 t1in 11 c2- 5 c2+ 4 c1- 3 c1+ 1 r1in 13 t2out 7 t1out 14 v- 6 v+ 2 v cc c4 0.1f 16 c1 0.1f c2 0.1f c bypass +3.3v rs-232 inputs ttl/cmos outputs c3 * 0.1f 5k 5k see table 2 for capacitor selection. max3222e max3232e 18 maxim integrated max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers _____________________________________typical operating circuits (continued) en 23 r5out 15 r4out 16 r3out 17 r2out 18 r1out 19 r2outb 20 r1outb 21 ttl/cmos outputs 5k 5k 5k 5k 5k r5in 8 * c3 can be returned to either v cc or ground. r4in 7 r3in 6 r2in 5 r1in 4 rs-232 inputs shdn 22 gnd 25 rs-232 outputs ttl/cmos inputs t3in 12 t2in 13 t1in 14 c2- 2 c2+ 1 c1- 24 c1+ 28 t3out 11 t2out 10 t1out 9 v- 3 v+ 27 v cc c4 0.1f c3 * 0.1f c1 0.1f c2 0.1f 26 +3.3v c bypass max3241e en 13 r3out 18 r2out 20 r1out 21 r1outb 16 logic outputs 5k 5k 5k r3in 11 r2in 9 r1in 8 rs-232 inputs gnd 2 rs-232 outputs logic inputs t3in 22 t2in 23 t1in 24 c2- 3 c2+ 1 c1- 25 c1+ 28 t3out 7 t2out 6 t1out 5 t1 t2 t3 r1 r2 r3 v- 4 v+ 27 v cc 0.1f c3* 0.1f 0.1f 0.1f 26 mbaud 15 t5in 17 t4in 19 t5out 12 t4out 10 shdn 14 t4 t5 c bypass +3.3v max3237e maxim integrated 19 max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers _____________________________________typical operating circuits (continued) en b3 r5out a3 r4out a2 r3out a1 r2out b1 r1out c2 ttl/cmos outputs 5k 5k 5k 5k 5k r5in c6 * c3 can be returned to either v cc or ground. r4in b6 r3in a6 r2in a5 r1in a4 rs-232 inputs shdn b2 gnd f5 rs-232 outputs ttl/cmos inputs t3in d2 t2ine2 t1in e3 c2- d1 c2+ e1 c1- f4 c1+ f3 t3out d6 t2out e6 t1out f6 v- c1 v+ f1 v cc c4 0.1f c3 * 0.1f c1 0.1f c2 0.1f f2 +3.3v c bypass max3246e 20 maxim integrated max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers selector guide part no. of drivers/ receivers low-power shutdown guaranteed data rate (bps) max3222e 2/2 ? 250k max3232e 2/2 250k max3237e (normal) 5/3 ? 250k max3237e (megabaud) 5/3 ? 1m max3241e 3/5 ? 250k max3246e 3/5 ? 250k package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. ordering information (continued) part temp range pin-package max3232ecte+ 0c to +70c 16 tqfn-ep** (5mm x 5mm) max3232ecue+ 0c to +70c 16 tssop max3232ecup+ 0c to +70c 20 tssop max3232eeae+ -40c to +85c 16 ssop max3232eewe+ -40c to +85c 16 wide so max3232eepe+ -40c to +85c 16 plastic dip max3232eete+ -40c to +85c 16 tqfn-ep** (5mm x 5mm) max3232eeue+ -40c to +85c 16 tssop max3232eeup+ -40c to +85c 20 tssop max3237e cai+ 0c to +70c 28 ssop max3237eeai+ -40c to +85c 28 ssop max3241e cai+ 0c to +70c 28 ssop max3241ecwi+ 0c to +70c 28 wide so max3241ecui+ 0c to +70c 28 tssop max3241ectj+ 0c to +70c 32 tqfn-ep** (7mm x 7mm) max3241eeai+ -40c to +85c 28 ssop max3241eewi+ -40c to +85c 28 wide so max3241eeui+ -40c to +85c 28 tssop max3246e cbx-t+ 0c to +70c 6 x 6 ucsp ? max3246eebx-t+ -40c to +85c 6 x 6 ucsp ? + denotes a lead(pb)-free/rohs-compliant package. ? requires solder temperature profile described in the absolute maximum ratings section. ucsp reliability is integrally linked to the user? assembly methods, circuit board material, and environment. refer to the ucsp reliability notice in the ucsp reliability section of this datasheet for more information. ** ep = exposed pad. package type package code outline no. land pattern no. 20 tqfn t2055+5 20-0140 90-0010 20 tssop h20+2 21-0066 90-0116 20 ssop a20+1 21-0056 90-0094 18 wide so w18+1 21-0042 90-0181 18 pdip p18+5 21-0043 16 ssop a16+2 21-0056 90-0106 16 wide so w16+3 21-0042 90-0107 16 pdip p16+1 21-0043 16 tqfn t1655+2 21-0140 90-0072 16 tssop u16+1 21-0066 90-0117 28 ssop a28+1 21-0056 90-0095 28 wide so w28+6 21-0042 90-0109 28 tssop u28+2 21-0066 90-0171 32 tqfn t3277+2 21-0144 90-0125 6x6 hcsp b36+3 21-0082 refer to application note 1891 chip information process: bicmos maxim integrated 21 max3222e/max3232e/max3237e/ max3241e/max3246e
15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers revision number revision date description pages changed 11 10/07 corrected package information 22C28 12 12/10 changed all parts to lead free in the ordering information , added automotive qualified part to ordering information , corrected capacitor in typical operating circuits 1, 19 revision history 22 maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. ? 2010 maxim integrated the maxim logo and maxim integrated are trademarks of maxim integrated products, inc. max3222e/max3232e/max3237e/ max3241e/max3246e

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