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general description the mxl1544/MAX3175 are four-driver/four-receiver multiprotocol transceivers that operate from a single +5v supply in conjunction with the mxl1543. the mxl1544/MAX3175, along with the mxl1543 and mxl1344a, form a complete software-selectable data terminal equipment (dte) or data communication equipment (dce) interface port that supports the v.28 (rs-232), v.10/v.11 (rs-449/v.36, eia-530, eia-530a, x.21, rs-423), and v.35 protocols. the mxl1544/ MAX3175 transceivers carry serial interface control sig- naling, while the mxl1543 carries the high-speed clock and data signals. typically, the mxl1543 is terminated using the mxl1344a. the MAX3175 is identical to the mxl1544 except for the addition of a 10? (typ) glitch rejection circuit at the receiver inputs. the mxl1544/ MAX3175 are available in 28-pin ssop packages. applications data networking csu and dsu data routers switches pci cards telecommunication equipment features mxl1544/MAX3175, mxl1543, mxl1344a chipset is pin compatible with ltc1544, ltc1543, ltc1344a chipset chipset operates from a single +5v supply software-selectable dce/ dte supports v.28 (rs-232), v.10/v.11 (rs-449/v.36, eia-530, eia-530a, x.21, rs-423) protocols flow-through pin configuration true fail-safe operation low 0.5a shutdown current (no-cable mode) 10s receiver input deglitching (MAX3175 only) tuv-certified net1/net2 and tbr1/tbr2 compliant mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers ________________________________________________________________ maxim integrated products 1 ordering information 19-1992; rev 0; 4/01 part temp. range pin-package mxl1544 cai 0 c to +70 c 28 ssop MAX3175 cai 0 c to +70 c 28 ssop typical operating circuit d1 d2 d3 d4 r1 r2 r3 mxl1543 rxd rxc txd txc scte d1 d2 d3 r1 r2 r3 mxl1544 MAX3175 cts dsr rts dtr dcd rxc b rxd a (104) rxd b sg (102) shield (101) rts a (105) rts b dtr a (108) dtr b dcd a (107) dcd b dsr a (109) cts a (106) dsr b cts b ll a (141) txd b scte a (113) scte b txc a (114) txc b txd a (103) db-25 connector 13 r4 ll rxc a (115) 18 5 10 8 22 6 23 20 19 4 1 7 16 3 9 17 12 15 11 24 14 2 mxl1344a pin configuration appears at end of data sheet. for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com.
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = +5v, v dd = +6.8v, v ee = -5.6v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (note 2) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. all voltages to gnd unless otherwise noted supply voltages v cc .......................................................................-0.3v to +6v v dd ....................................................................-0.3v to +7.2v v ee ........................................................................+0.3v to -7v v dd to v ee (note 1)............................................................13v logic input voltage m0, m1, m2, dce/ dte , invert, t_in..................-0.3v to +6v logic output voltage r_out ....................................................-0.3v to (v cc + 0.3v) transmitter outputs t_out_, t_out_/r_in........................................-15v to +15v short-circuit duration.............................................continuous receiver inputs r_in_, t_out_/r_in_ .........................................-15v to +15v continuous power dissipation (t a = +70?) 28-pin ssop (derate 11.1mw/? above +70?) .........889mw operating temperature range...............................0? to +70? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units power supplies rs-530, rs-530a, x.21, no load 2.7 rs-530, rs-530a, x.21, full load 95 120 v.28, no load 1 2 v.28, full load 1 2 ma v c c s up p l y c ur r ent ( d c e m od e) ( d i g i tal inp uts = g n d or v c c ) ( tr ansm i tter s o utp uts s tati c) i cc no-cable mode, invert = v c c 0.5 10 a rs-530, rs-530a, x.21, no load 2.1 rs-530, x.21, full load 14 rs-530a, full load 25 v.28, no load 1 v.28, full load 12 ma v ee supply current (dce mode) (digital inputs = gnd or v cc ) (transmitters outputs static) i ee no-cable mode 0.5 a rs-530, rs-530a, x.21, no load 0.6 rs-530, rs-530a, x.21, full load 1 v.28, no load 1 v.28, full load 12 ma v d d s up p l y c ur r ent ( d c e m od e) ( d i g i tal inp uts = g n d or v c c ) ( tr ansm i tter s o utp uts s tati c) i dd no-cable mode 0.5 a rs-530, rs-530a, x.21, full load 300 internal power dissipation (dce mode) p d v.28, full load 54 mw logic inputs (m0, m1, m2, dce/ dte , invert, t1in, t2in, t3in, t4in) input high voltage v ih 2.0 v input low voltage v il 0.8 v t1in, t2in, t3in, t4in 10 m0, m1, m2, dce/ dte , invert = gnd -100 -50 -30 logic input current i in m0, m1, m2, dce/ dte , invert = v cc 10 a note 1: v dd and v ee - can have maximum magnitude of 7.2v and 7v, respectively, but their difference cannot exceed 13v.
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers _______________________________________________________________________________________ 3 parameter symbol conditions min typ max units logic outputs (r1out, r2out, r3out, r4out) output high voltage v oh i source = 4ma 3 4.5 v output low voltage v ol i sink = 4ma 0.3 0.8 v output short-circuit current i sc 0 v out v cc -50 50 ma output pullup current i l v out = 0, no-cable mode 70 a receiver inputs receiver glitch rejection MAX3175 only 5 10 15 s v.11 transmitter open-circuit differential output voltage v odo op en ci r cui t, r = 1.95k ? ( fi g ur e 1) 5v r = 50 ? (figure 1), t a = +25 c 0.5 ? v odo 0.67 ? v odo loaded differential output voltage v odl r = 50 ? (figure 1) 2 v change in magnitude of output differential voltage ? v od r = 50 ? (figure 1) 0.2 v common-mode output voltage v oc r = 50 ? (figure 1) 3 v change in magnitude of output common-mode voltage ? v oc r = 50 ? (figure 1) 0.2 v short-circuit current i sc v out = gnd 150 ma output leakage current i z -0.25v < v out < +0.25v, power-off or no- cable mode 1 100 a rise or fall time t r , t f r = 50 ? (figures 2, 5) 2 15 25 ns transmitter input to output t phl , t plh r = 50 ? (figures 2, 5) 50 75 ns data skew |t phl - t plh | (figures 2, 5) 3 12 ns output-to-output skew (figures 2, 5) 3 ns v.11 receiver differential input voltage v th -7v v cm 7v -200 200 mv input hysteresis ? v th -7v v cm 7v 15 40 mv receiver input current i in -10v v a , b 10v 0.66 ma receiver input resistance r in -10v v a , b 10v 15 30 k ? rise or fall time t r , t f (figures 2, 6) 15 ns mxl1544 50 80 ns receiver input to output t phl , t plh (figures 2, 6) MAX3175 10 s mxl1544 4 16 ns data skew |t phl - t plh | (figures 2, 6) MAX3175 1 s electrical characteristics (continued) (v cc = +5v, v dd = +6.8v, v ee = -5.6v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 c.) (note 2)
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers 4 _______________________________________________________________________________________ electrical characteristics (continued) (v cc = +5v, v dd = +6.8v, v ee = -5.6v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 c.) (note 2) parameter symbol conditions min typ max units v.10 transmitter open-circuit output voltage swing v o r l = 3.9k ? (figure 3) 4 6v r l = 450 ? (figure 3) 3.6 output voltage swing v t r l = 450 ? (figure 3), t a = +25 c 0.9 x v o v short-circuit current i sc v o = gnd, t a = +25 c 150 ma output leakage current i z -0.25v < v out < +0.25v, power-off or no-cable mode 1 100 a rise or fall time t r , t f r l = 450 ? , c l = 100pf (figures 3, 7) 2 s transmitter input to output t phl , t plh r l = 450 ? , c l = 100pf (figures 3, 7) 1 s v.10 receiver differential threshold voltage v th -250 250 mv input hysteresis ? v th 25 50 mv receiver input current i in -10v v a 10v 0.66 ma receiver input impedance r in -10v v a 10v 15 30 k ? rise or fall time t r , t f (figures 4, 8) 15 ns mxl1544 55 ns t plh MAX3175 10 s mxl1544 109 ns receiver input to output t phl ( fi g ur es 4, 8) MAX3175 10 s mxl1544 60 ns data skew |t phl - t plh | ( fi g ur es 4, 8) MAX3175 1 s v.28 transmitter open circuit (figure 3) 7v output voltage swing v o r l = 3k ? (figure 3) 5 6v short-circuit current i sc v o = gnd 150 ma output leakage current i z -0.25v v out +0.25v, power-off or no-cable mode 1 100 a output slew rate sr r l = 3k ? , c l = 2500pf (figures 3, 7) 4 30 v/ s t phl 1.5 2.5 transmitter input to output t plh r l = 3k ? , c l = 2500pf (figures 3, 7) 1.5 3 s v.28 receiver input low voltage v il 1.3 0.8 v input high voltage v ih 2.0 1.3 v input hysteresis v hys 0.05 0.3 v input resistance r in -15v < v in < +15v 3 5 7 k ? rise or fall time t r , t f (figures 4, 8) 15 ns
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers _______________________________________________________________________________________ 5 120 0.1 1 10 100 1000 10,000 100 80 60 40 20 v.11 mode supply current (i cc ) vs. data rate mxl1544/MAX3175 toc01 data rate (kbps) i cc (ma) 0 full load, r = 50 ? dce mode invert = 1 no load, r = 1.95k ? 10 1 0.1 1 10 100 1000 10,000 v.11 mode supply current (i dd ) vs. data rate 2 3 mxl1544/MAX3175 toc02 data rate (kbps) i dd (ma) 5 4 8 9 7 6 full, r = 50 ? no load, r = 1.95k ? dce mode invert = 1 0 10 1 0.1 1 10 100 1000 10,000 v.11 mode supply current (i ee ) vs. data rate 2 3 mxl1544/MAX3175 toc03 data rate (kbps) i ee (ma) 5 4 8 9 7 6 full, r = 50 ? no load, r = 1.95k ? dce mode invert = 1 0 typical operating characteristics (t a = +25 c, unless otherwise noted.) electrical characteristics (continued) (v cc = +5v, v dd = +6.8v, v ee = -5.6v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 c.) (note 2) parameter symbol conditions min typ max units mxl1544 60 100 ns t plh MAX3175 10 s mxl1544 70 450 ns receiver input to output t phl (figures 4, 8) MAX3175 10 s note 2: mxl1544/MAX3175 are designed to operate with v dd and v ee supplied by the mxl1543 charge pump. 0.65 0.66 0.67 0.68 0.69 0.70 0.71 0.72 0.73 0 50 100 150 200 250 v.28 mode supply current (i cc ) vs. data rate mxl1544/MAX3175 toc04 data rate (kbps) i cc (ma) dce mode invert = 0 full load (r l = 3k ? , c l = 2500) and no load
-300 -100 -200 100 0 200 300 -10 0 -5 5 10 v.11 receiver input current vs. input voltage mxl1544/MAX3175 toc10 input voltage (v) input current ( a) mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers 6 _______________________________________________________________________________________ typical operating characteristics (continued) (t a = +25 c, unless otherwise noted.) v.28 mode supply current (i dd ) vs. data rate mxl1544/MAX3175 toc05 data rate (kbps) i dd (ma) 0 5 15 10 20 25 0100 50 150 200 250 dce mode invert = 0 no load full load, r l = 3k ?, c l = 2500pf 0 10 5 20 15 30 25 35 0100 50 150 200 250 v.28 mode supply current (i ee ) vs. data rate mxl1544/MAX3175 toc06 data rate (kbps) i ee (ma) dce mode invert = 0 full load, r l = 3k ? , c l = 2500pf no load -5 -2 -3 -4 0 -1 4 3 2 1 5 0 10203040506070 v.11 loaded differential output voltage vs. temperature mxl1544/MAX3175 toc07 temperature ( c) differential output voltage (v) dce mode invert = 1 r l = 50 ? v out+ v out- -10 -4 -6 -8 0 -2 8 6 4 2 10 0 10203040506070 v.28 loaded output voltage vs. temperature mxl1544/MAX3175 toc09 temperature ( c) output voltage (v) dce mode r l = 3k ? v out- v out+ -10 -4 -6 -8 0 -2 8 6 4 2 10 0 10203040506070 v.10 loaded output voltage vs. temperature mxl1544/MAX3175 toc08 temperature ( c) output voltage (v) v out+ v out- dce mode r l = 450 ?
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers _______________________________________________________________________________________ 7 0 1.0 0.5 2.0 1.5 3.0 2.5 3.5 0 1000 1500 500 2000 2500 3000 v.10 transmitter rise and fall time vs. load capacitance mxl1544/MAX3175 toc13 capacitance (pf) rise/fall time ( s) rise fall 4 s/div mxl1544 loopback scope photo v.11 mode (unloaded) t in t out / r in 5v/div 5v/div 5v/div mxl1544/MAX3175 toc14 r out 4 s/div mxl1544 loopback scope photo v.28 mode (loaded) t in t out / r in 5v/div 5v/div 5v/div mxl1544/MAX3175 toc15 r out 4 s/div mxl1544 loopback scope photo v.10 mode (loaded) t in t out / r in 5v/div 5v/div 5v/div mxl1544/MAX3175 toc16 r out -5 -2 -3 -4 -1 0 1 2 3 4 5 -15 -5 -10 0 5 10 15 v.28 receiver input current vs. input voltage mxl1544/MAX3175 toc11 input voltage (v) input current (ma) 0 4 2 10 8 6 16 14 12 18 02000 1000 3000 4000 5000 v.28 slew rate vs. load capacitance mxl1544/MAX3175 toc12 capacitance (pf) slew rate (v/ s) slew- slew+ typical operating characteristics (continued) (t a = +25 c, unless otherwise noted.)
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers 8 _______________________________________________________________________________________ pin description pin name function 1v cc +5v supply voltage ( 5%). bypass with a 1f capacitor to ground. 2v dd positive supply generated by mxl1543. bypass with a 1f capacitor to ground. 3 t1in transmitter 1 ttl-compatible input 4 t2in transmitter 2 ttl-compatible input 5 t3in transmitter 3 ttl-compatible input 6 r1out receiver 1 cmos output 7 r2out receiver 2 cmos output 8 r3out receiver 3 cmos output 9 t4in transmitter 4 ttl-compatible input 10 r4out receiver 4 cmos output 11 m0 ttl-compatible mode select pin with internal pullup to v cc 12 m1 ttl-compatible mode select pin with internal pullup to v cc 13 m2 ttl-compatible mode select pin with internal pullup to v cc 14 dce/ dte ttl-compatible input with internal pullup to v cc . logic level high selects dce interface. 15 invert ttl inp ut w i th inter nal p ul l up to v c c . in v e rt = h igh r ever ses acti on of d c e / dte for c hannel 4. 16 t4outa/r4ina transmitter output/inverting receiver input 17 r3inb noninverting receiver input 18 r3ina inverting receiver input 19 r2inb noninverting receiver input 20 r2ina inverting receiver input 21 t3outb/r1inb noninverting transmitter output/noninverting receiver input 22 t3outa/r1ina inverting transmitter output/inverting receiver input 23 t2outb noninverting transmitter output 24 t2outa inverting transmitter output 25 t1outb noninverting transmitter output 26 t1outa inverting transmitter output 27 gnd ground 28 v ee negative supply generated by mxl1543. bypass with a 1f capacitor to ground.
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers _______________________________________________________________________________________ 9 detailed description the mxl1544/MAX3175 are four-driver/four-receiver multiprotocol transceivers that operate from a single +5v supply and the charge pump from the mxl1543. the mxl1544/MAX3175, along with the mxl1543 and mxl1344a, form a complete software-selectable dte or dce interface port that supports the v.28 (rs-232), v.10/v.11 (rs-449, v.36, eia-530, eia-530a, x.21, rs- 423), and v.35 protocols. the mxl1544 or MAX3175 usually carries the control signals. the mxl1543 car- ries the high-speed clock and data signals, and the mxl1344a provides termination for the clock and data signals. the mxl1544/MAX3175 feature a 0.5a no-cable mode, true fail-safe operation, and thermal shutdown circuitry. thermal shutdown protects the drivers against excessive power dissipation. when activated, the ther- mal shutdown circuitry places the driver outputs into a high-impedance state. the MAX3175 deglitching fea- ture reduces errors in unterminated equipment. the state of the mode-select pins m0, m1, and m2 determines which serial-interface protocol is selected (table 1). the state of the dce/ dte input determines whether the transceivers will be configured as a dte serial port or a dce serial port. when the dce/ dte input is logic high, driver t3 is activated and receiver r1 is disabled. when the dce/ dte input is logic low, driver t3 is disabled and receiver r1 is activated. the invert pin state changes the dce/ dte functionality regarding t4 and r4 only. m0, m1, m2, invert, and dce/ dte are internally pulled up to v cc to ensure logic high if left unconnected. v oc r r v od figure 1. v.11 dc test circuit c l r l v o da figure 3. v.10/v.28 driver test circuit 100pf 15pf 100pf 100 ? d a b b a r 15pf dar figure 2. v.11 ac test circuit figure 4. v.10/v.28 receiver test circuit test circuits
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers 10 ______________________________________________________________________________________ f = 1mhz: t r 10ns: t f 10ns v diff = v(b) - v(a) 1.5v 1/2 v 0 v 0 90% 10% 50% t plh 5v 0 v 0 -v 0 d a b b-a t r t skew 1.5v t phl t skew 90% 10% 50% t f figure 5. v.11, v.35 driver propagation delays v 0d2 -v 0d2 v 0h v 0l b-a r 0 input output 0 1.5v f = 1mhz: t r 10ns: t f 10ns t plh 1.5v t phl figure 6. v.11, v.35 receiver propagation delays 1.5v 0 t phl 3v 0 v 0 -v 0 d a -3v 3v t f 0 0 t plh 3v -3v t r figure 7. v.10, v.28 driver propagation delays v ih v il v 0h v 0l a r 1.3v t phl 0.8v 1.7v t plh 2.4v figure 8. v.10, v.28 receiver propagation delays switching time waveforms
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers ______________________________________________________________________________________ 11 the mxl1544/MAX3175s mode can be selected through software control of the m0, m1, m2, invert, and dce/ dte inputs. alternatively, the mode can be selected by shorting the appropriate combination of mode control inputs to gnd (the inputs left floating will be internally pulled up to v cc - logic high). if the m0, m1, and m2 mode inputs are all unconnected, the mxl1544/MAX3175 will enter no-cable mode. fail-safe the mxl1544/MAX3175 guarantee a logic high receiver output when the receiver inputs are shorted or open, or when they are connected to a terminated transmission line with all drivers disabled. the v.11 receiver threshold is set between -200mv and 0mv to guarantee fail-safe operation. if the differential receiver input voltage (b - a) is 0mv, rout is logic high. in the case of a terminated bus with all transmitters dis- abled, the receiver s differential input voltage is pulled to 0 by the termination. with the receiver thresholds of the mxl1544/MAX3175, this results in rout logic high. the v.10 receiver threshold is set between -250mv and 0mv. if the v.10 receiver input voltage is less than or equal to -250mv, rout is logic high. the v.28 receiv- er threshold is set between 0.8v and 2.0v. if the receiv- er input voltage is less than or equal to 0.8v, rout is logic high. in the case of a terminated bus with trans- mitters disabled, the receiver s input voltage is pulled to 0 by the termination. applications information cable-selectable mode a cable-selectable, multiprotocol dte/dce interface is shown in figure 9. the mode control lines m0, m1, and dce/ dte are wired to the db-25 connector. to select the serial interface mode, the appropriate combination of m0, m1, m2, and dce/ dte are grounded within the cable wiring. the control lines that are not grounded are pulled high by the internal pullups on the mxl1543. the serial interface protocol of the mxl1544/MAX3175 is now selected based on the cable that is connected to the db-25 interface. v.10 (rs-423) interface the v.10 interface (figure 10) is an unbalanced single- ended interface capable of driving a 450 ? load. the v.10 driver generates a minimum v o voltage of 4v across a and c when unloaded and a minimum volt- age of 0.9 ? v o when loaded with 450 ? . the v.10 receiver has a single-ended input and does not reject common-mode differences between c and c . the v.10 receiver input trip threshold is defined between +250mv and -250mv with input impedance character- istic shown in figure 11. the mxl1544/MAX3175 v.10 mode receiver has a dif- ferential threshold between -250mv and +250mv. to ensure that the receiver has proper fail-safe operation see the fail-safe section. to aid in rejecting system noise, the mxl1544/MAX3175 v.10 receiver has a typi- cal hysteresis of 25mv. switch s3 in figure 12 is open in v.10 mode to disable the v.28 5k ? termination at the receiver input. switch s4 is closed and switch s5 is open to internally ground the receiver b input. v.11 (rs-422) interface as shown in figure 13, the v.11 protocol is a fully bal- anced differential interface. the v.11 driver generates a minimum of 2v between nodes a and b when 100 ? minimum resistance is presented at the load. the v.11 receiver is sensitive to differential signals of 200mv at receiver inputs a and b . the v.11 receiver input must comply with the impedance curve of figure 11 and reject common-mode signals developed across the cable (referenced from c to c in figure 13) of up to 7v. the mxl1544/MAX3175 v.11 mode receiver has a dif- ferential threshold between -200mv and +200mv. to ensure that the receiver has proper fail-safe operation; see the fail-safe section. to aid in rejecting system noise, the mxl1544/MAX3175 v.11 receiver has a typi- cal hysteresis of 15mv. switch s3 in figure 14 is open in v.11 mode to disable the v.28 5k ? termination at the inverting receiver input. because the control signals are slow (60kbps), 100 ? termination resistance is generally not required for the mxl1544/MAX3175. the receiver inputs must also be compliant with the impedance curve shown in figure 11. v.28 (rs-232) interface the v.28 interface is an unbalanced single-ended inter- face (figure 10). the v.28 generator provides a mini- mum of 5v across the 3k ? load impedance between a and c . the v.28 receiver has single-ended input. the mxl1544/MAX3175 v.28 mode receiver has a threshold between +0.8v and +2.0v. to aid in rejecting system noise, the mxl1544/MAX3175 v.28 receiver has a typical hysteresis of 50mv. switch s3 in figure 15 is closed in v.28 mode to enable the 5k ? v.28 termina- tion at the receiver inputs. no-cable mode the mxl1544/MAX3175 will enter no-cable mode when the mode-select pins are left unconnected or connect- ed high (m0 = m1 = m2 = 1). in this mode, the multi- protocol drivers and receivers are disabled and the
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers 12 ______________________________________________________________________________________ cts a 4 25 21 18 2 14 24 11 15 12 17 9 3 16 7 19 20 23 8 10 6 22 5 13 cts b dsr a dsr b dcd a dcd b dtr a dtr b rts a rts b rxd a rxd b rxc a rxc b txc a txc b scte a scte b txd a txd b charge pump dte dce rts a rts b dtr a dtr b dcd a dcd b dsr a dsr b cts a cts b txd a txd b scte a scte b txc a txc b rxc a rxc b rxd a rxd b sg m2 c12 1 f c13 1 f c5 4.7 f c2 1 f c1 1 f c4 1 f c3 4.7 f 2 21 d1 d2 d3 r1 r2 r3 28 27 26 25 24 23 22 21 20 19 18 17 16 15 3 v cc 5v 1 2 4 5 6 7 8 9 10 11 12 13 14 14 3 4 6 7 9 10 16 15 18 17 19 20 22 23 24 1 5 8111213 c6 100pf c7 100pf c8 100pf m1 m0 dce/dte m1 m2 dce/dte m0 v cc v cc v cc v ee v ee v cc v dd gnd latch mxl1344a mxl1543 d1 d2 d3 d4 r1 r2 r3 26 27 28 25 24 23 22 21 20 19 18 17 5 6 7 8 9 4 3 1 2 r4 16 15 10 11 12 13 nc nc 14 m1 m2 dce/dte invert m0 db-25 connector mxl1544 MAX3175 c11 1 f c10 1 f c9 1 f 1 shield dte_txd/dce_rxd dte_scte/dce_rxc dte_txc/dce_txc dte_rxc/dce_scte dte_rxd/dce_txd dte_rts/dce_cts dte_dtr/dce_dsr dte_dcd/dce_dcd dte_dsr/dce_dtr dte_cts/dce_rts m1 dce/dte m0 mode v.35 rs-449. v.36 rs-232 pin 18 pin 7 n.c. pin 7 pin 21 pin 7 pin 7 n.c. cable wiring for mode selection mode dte dce pin 25 pin 7 n.c. cable wiring for dte/dce selection figure 9. cable-selectable multiprotocol dce/dte port with db-25 connector
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers ______________________________________________________________________________________ 13 supply current is less than 10a. the receiver outputs enter a high-impedance state in no-cable mode, which allows these output lines to be shared with other receiv- er outputs (the receiver outputs have an internal pullup resistor to pull the outputs high if not driven). also, in no-cable mode, the transmitter outputs enter a high- impedance state, so these output lines can be shared with other devices. receiver glitch rejection to improve operation in an unterminated or otherwise noisy system, the MAX3175 features 10s of receiver input glitch rejection. the glitch-rejection circuitry blocks the reception of high-frequency noise (t b < 5s) while receiving a low-frequency signal (t b >15s) allow- ing glitch-free operation in unterminated systems at up to 60kbps. the mxl1544 does not have this feature and can be operated at frequencies greater than 60kbps if properly terminated. a c a c generator unbalanced interconnecting cable cable termination receiver load -3.25ma 3.25ma -10v +10v -3v +3v v z i z r6 10k ? r8 5k ? a b c a b gnd r5 30k ? r7 10k ? r4 30k ? s4 s5 mxl1544 MAX3175 s3 receiver 100 ? min a b c a b c generator balanced interconnecting cable cable termination receiver load figure 10. typical v.10/v.28 interface figure 11. receiver input impedance curve figure 12. v.10 internal resistance network figure 13. typical v.11 interface
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers 14 ______________________________________________________________________________________ dte vs. dce operation figure 16 shows a port with one db-25 connector that can be configured for either dte or dce operation. the configuration requires separate cables for proper sig- nal routing in dte or dce operation. figure 16 illus- trates a dce or dte controller-selectable interface. the dce/ dte and invert inputs switch the port s mode of operation (table 1). the mxl1543 and mxl1544/MAX3175 can be connect- ed for either dte or dce operation in one of two ways: a dedicated dte or dce port with an appropriate gen- der connector or a port with a connector that can be configured for dte or dce operation by rerouting the signals to the mxl1543 and mxl1544/MAX3175 using a dedicated dte cable or dedicated dce cable. the interface mode is selected by logic outputs from the controller or from jumpers to either v cc or gnd on the mode select pins. a dedicated dce port using a db-25 female connector is shown in figure 17. figure 18 illus- trates a dedicated dte port using a db-25 male con- nector. r6 10k ? r8 5k ? a b c a b gnd r5 30k ? r7 10k ? r4 30k ? mxl1544 MAX3175 s3 receiver r6 10k ? r8 5k ? a b c a b gnd r5 30k ? r7 10k ? r4 30k ? mxl1544 MAX3175 s3 receiver figure 15. v.28 termination and internal resistance network figure 14. v.11 internal resistance networks
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers ______________________________________________________________________________________ 15 protocol m2 m1 m0 dce/ dte invert t1 t2 t3 r1 r2 r3 t4 r4 not used (default v.11) 0 0 0 0 0 v.11 v.11 z v.11 v.11 v.11 z v.10 rs-530a 0 0 1 0 0 v.11 v.10 z v.11 v.10 v.11 z v.10 rs-530 0 1 0 0 0 v.11 v.11 z v.11 v.11 v.11 z v.10 x.21 0 1 1 0 0 v.11 v.11 z v.11 v.11 v.11 z v.10 v.35 1 0 0 0 0 v.28 v.28 z v.28 v.28 v.28 z v.28 rs-449/v.36 1 0 1 0 0 v.11 v.11 z v.11 v.11 v.11 z v.10 v.28/rs-232 1 1 0 0 0 v.28 v.28 z v.28 v.28 v.28 z v.28 no cable 1 1 1 0 0 z z z z z z z z not used (default v.11) 0 0 0 0 1 v.11 v.11 z v.11 v.11 v.11 v.10 z rs-530a 0 0 1 0 1 v.11 v.10 z v.11 v.10 v.11 v.10 z rs-530 0 1 0 0 1 v.11 v.11 z v.11 v.11 v.11 v.10 z x.21 0 1 1 0 1 v.11 v.11 z v.11 v.11 v.11 v.10 z v.35 1 0 0 0 1 v.28 v.28 z v.28 v.28 v.28 v.28 z rs-449/v.36 1 0 1 0 1 v.11 v.11 z v.11 v.11 v.11 v.10 z v.28/rs-232 1 1 0 0 1 v.28 v.28 z v.28 v.28 v.28 v.28 z no cable 1 1 1 0 1 z z z z z z z z not used (default v.11) 0 0 0 1 0 v.11 v.11 v.11 z v.11 v.11 v.10 z rs-530a 0 0 1 1 0 v.11 v.10 v.11 z v.10 v.11 v.10 z rs-530 0 1 0 1 0 v.11 v.11 v.11 z v.11 v.11 v.10 z x.21 0 1 1 1 0 v.11 v.11 v.11 z v.11 v.11 v.10 z v.35 1 0 0 1 0 v.28 v.28 v.28 z v.28 v.28 v.28 z rs-449/v.36 1 0 1 1 0 v.11 v.11 v.11 z v.11 v.11 v.10 z v.28/rs-232 1 1 0 1 0 v.28 v.28 v.28 z v.28 v.28 v.28 z no cable 1 1 1 1 0 z z z z z z z z not used (default v.11) 0 0 0 1 1 v.11 v.11 v.11 z v.11 v.11 z v.10 rs-530a 0 0 1 1 1 v.11 v.10 v.11 z v.10 v.11 z v.10 rs-530 0 1 0 1 1 v.11 v.11 v.11 z v.11 v.11 z v.10 x.21 0 1 1 1 1 v.11 v.11 v.11 z v.11 v.11 z v.10 v.35 1 0 0 1 1 v.28 v.28 v.28 z v.28 v.28 z v.28 rs-449/v.36 1 0 1 1 1 v.11 v.11 v.11 z v.11 v.11 z v.10 v.28/rs-232 1 1 0 1 1 v.28 v.28 v.28 z v.28 v.28 z v.28 no cable 1 1 1 1 1 z z z z z z z z table 1. mode select table
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers 16 ______________________________________________________________________________________ cts a 4 2 14 24 11 15 12 17 9 3 16 7 19 20 23 8 10 6 22 5 13 18 cts b dsr a dsr b dcd a dcd b dtr a dtr b rts a rts b rxd a rxd b rxc a rxc b txc a txc b scte a scte b txd a txd b charge pump dte dce rts a rts b dtr a dtr b dcd a dcd b dsr a dsr b cts a cts b ll a ll a txd a txd b scte a scte b txc a txc b rxc a rxc b rxd a rxd b sg m2 c12 1 f c13 1 f c5 4.7 f c2 1 f c1 1 f c4 1 f c3 4.7 f 2 21 d1 d2 d3 r1 r2 r3 28 27 26 25 24 23 22 21 20 19 18 17 16 15 3 v cc 5v 1 2 4 5 6 7 8 9 10 11 12 13 14 14 3 4 6 7 9 10 16 15 18 17 19 20 22 23 24 1 5 8111213 c6 100pf c7 100pf c8 100pf m1 m0 dce/dte m1 m2 dce/dte m0 v cc v cc v ee v ee v cc v dd gnd latch mxl1344a mxl1543 d1 d2 d3 d4 r1 r2 r3 26 27 28 25 24 23 22 21 20 19 18 17 5 6 7 8 9 4 3 1 2 r4 16 15 10 11 12 13 14 m1 m2 dce/dte invert m0 m1 m2 invert dce/dte m0 db-25 connector mxl1544 MAX3175 c11 1 f c10 1 f c9 1 f 1 shield dte_txd/dce_rxd dte_scte/dce_rxc dte_txc/dce_txc dte_rxc/dce_scte dte_rxd/dce_txd dte_rts/dce_cts dte_dtr/dce_dsr dte_dcd/dce_dcd dte_dsr/dce_dtr dte_cts/dce_rts dte_ll/dce_ll figure 16. controller-selectable multiprotocol dce/dte port with db-25 connector
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers ______________________________________________________________________________________ 17 cts a (106) 5 3 16 17 9 15 12 24 11 2 14 7 13 6 22 8 10 20 23 4 19 18 cts b dsr a (107) dsr b dcd a (109) dcd b dtr a (108) dtr b rts a (105) rts b rxd b rxc a (115) rxc b scte a (113) scte b txd a (103) txd b charge pump ll a (141) rxd a (104) txc a (114) txc b sgnd (102) m2 c12 1 f c13 1 f c5 4.7 f c2 1 f c1 1 f c4 1 f c3 4.7 f 2 21 d1 d2 d3 r1 r2 r3 28 27 26 25 24 23 22 21 20 19 18 17 16 15 3 v cc 5v 1 2 4 5 6 7 8 9 10 11 12 13 14 14 3 4 6 7 9 10 16 15 18 17 19 20 22 23 24 1 5 8111213 c6 100pf c7 100pf c8 100pf m1 m0 dce/dte m1 m2 dce/dte m0 v cc v cc v cc v ee v ee v cc v dd gnd latch mxl1344a mxl1543 d1 d2 d3 d4 r1 r2 r3 26 27 28 25 24 23 22 21 20 19 18 17 5 6 7 8 9 4 3 1 2 r4 16 15 10 11 12 13 14 nc nc m1 m2 dce/dte invert m0 m1 m2 invert m0 db-25 female connector mxl1544 MAX3175 c11 1 f c10 1 f c9 1 f 1 shield (101) rxd rxc txc scte txd cts dsr dcd dtr rts ll figure 17. controller-selectable dce port with db-25 connector
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers 18 ______________________________________________________________________________________ 4 2 14 24 11 15 12 17 9 3 16 7 19 20 23 8 10 6 22 5 13 18 charge pump rts a (105) rts b dtr a (108) dtr b dcd a (109) dcd b dsr a (107) dsr b cts a (106) cts b ll a (141) txd a (103) txd b scte a (113) scte b txc a (114) txc b rxc a (115) rxc b rxd a (104) rxd b sg m2 c12 1 f c13 1 f c5 4.7 f c2 1 f c1 1 f c4 1 f c3 4.7 f 2 21 d1 d2 d3 r1 r2 r3 28 27 26 25 24 23 22 21 20 19 18 17 16 15 3 v cc 5v 1 2 4 5 6 7 8 9 10 11 12 13 14 14 3 4 6 7 9 10 16 15 18 17 19 20 22 23 24 1 5 8111213 c6 100pf c7 100pf c8 100pf m1 m0 dce/dte m1 m2 dce/dte m0 v cc v cc v ee v ee v cc v dd gnd latch mxl1344a mxl1543 d1 d2 d3 d4 r1 r2 r3 26 27 28 25 24 23 22 21 20 19 18 17 5 6 7 8 9 4 3 1 2 r4 16 15 10 11 12 13 14 m1 m2 dce/dte invert m0 m1 m2 invert m0 db-25 male connector mxl1544 MAX3175 c11 1 f c10 1 f c9 1 f 1 shield txd scte txc rxc rxd rts dtr dcd dsr cts ll figure 18. controller-selectable multiprotocol dte port with db-25 connector
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers ______________________________________________________________________________________ 19 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 v ee gnd t1outa t1outb t2outa t2outb invert t3outa/r1ina t3outb/r1inb r2ina r2inb r3ina r3inb t4outa/r4ina dce/dte m2 m1 m0 r4out t4in r3out r2out r1out t3in t2in t1in v dd v cc ssop top view mxl1544 MAX3175 pin configuration chip information transistor count: 2348 process: bicmos
mxl1544/MAX3175 +5v multiprotocol, software-selectable control transceivers maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 20 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2001 maxim integrated products printed usa is a registered trademark of maxim integrated products. package information ssop.eps

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