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exar corporation 48720 kato road, fremont ca, 94538 ? 510-668-7017 ? www.exar.com sp385e_100_030811 1 sp385e enhanced +3v or +5v rs-232 line driver/receiver exar's sp385e is an enhanced version of the sp200 family of rs-232 line drivers/receivers. the sp385e offers +3.3v operation for eia-562 and eia-232 applications. the sp385e features offered maintains the same performance features offered in its predecessors. the sp385e is available in plastic soic or ssop packages operating over the commercial and industrial temperature ranges. the sp385e is pin compatible to the ltc1385 eia-562 transceiver with the exception that the drivers are disabled with the on/off pin. features operates from 3.3v or 5v power supply meets all eia-232d and v.28 specifca - tions at 5v. meets eia-562 specifcations at 3.3v two drivers and receivers operates with 0.1f to 10f capacitors high data rate - 120kbps under load low power shutdown 1a 3-state ttl/cmos receiver outputs low power cmos - 5ma operation improved esd specifcations: + 15kv human body model + 15kv iec61000-4-2 air discharge + 8kv iec61000-4-2 contact discharge description typical a pplication circuit now available in lead free packaging on/off v gn d t ou t r in r ou t t in t in r ou t n/ c c + v+ c - c + c - v- t ou t r in 2 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 1 1 cc 2 2 sp385e 2 1 2 2 1 1 1 r 2 r 1 t 2 t 1 ttl/cmos inputs rs232 outputs ttl/cmos outputs rs232 inputs charge pump
2 exar corporation 48720 kato road, fremont ca, 94538 ? 510-668-7017 ? www.exar.com sp385e_100_030811 absolute maximum ratings these are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifcations below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability and cause permanent damage to the device. v cc ................................................................... +6.0v v+ .............................................(vcc-0.3v) to +13.2v v- .................................................................... -13.2v input voltages txin, .......................................-0.3v to (vcc + 0.3v) rxin................................................................... + 15v output voltages txout.................................(v+, +0.3v) to (v-, -0.3v) rxout........................................-0.3v to (v cc +0.3v) short-circuit duration txout....................................................continuous storage temperature......................-65c to +150c v cc = +3.3v + 10%; cap on (v+) and (v-) = 1.0 f, c1 = c2 = 0.1f; t min to t max unless otherwise noted . electrical characteristics parameter min. ty p. max. units conditions ttl input input logic threshold low 0.8 v txin, on/off, vcc = 3.3v input logic threshold high 2.0 v txin, on/off, vcc = 3.3v logic pullup current 15 200 a t in = 0v maximum data rate 120 kbps c l = 2500pf, r l = 3k? ttl output ttl/cmos output voltage low 0.5 v i out = 3.2ma, vcc = 3.3v ttl/cmos output voltage high 2.4 v i out = -1.0ma leakage current + 0.05 + 10 a on/off = 0v, 0v v out vcc, t a = 25 c eia-562 output output voltage swing + 3.7 + 4.2 v all transmitter outputs loaded with 3k? to gnd power dissipation 20-pin ssop ..................................................750mw (derate 9.25mw/c above +70 c) 18-pin wide soic.........................................1260mw (derate 15.7mw/c above +70 c)
exar corporation 48720 kato road, fremont ca, 94538 ? 510-668-7017 ? www.exar.com sp385e_100_030811 3 electrical characteristics parameter min. ty p. max. units conditions eia-562 output (continued) power-off output resistance 300 ? v cc = 0v, v out = + 2v output short-circuit current + 10 ma infnite duration eia-562 input input voltage range -15 15 v input threshold low 0.8 1.2 v v cc = 3.3v, t a = +25c input threshold high 1.7 2.4 v v cc = 3.3v, t a = +25c input hysteresis 0.2 0.5 1.0 v v cc = 3.3v, t a = +25c input resistance 3 5 7 k? v in = 15v to -15v dynamic characteristics driver propagation delay 4.0 s ttl to rs-562 receiver propagation delay 1.5 s rs-562 to ttl instantaneous slew rate 30 v/s c l = 10pf, r l = 3k? - 7k?: t a = +25c transition-region slew rate 10 v/s c l = 2500pf, r l = 3k?; measured from +2v to -2v or -2v to +2v output enable time 300 ns output disable time 1000 ns power requirements vcc power supply current 3 6 ma no load, t a = +25c; vcc = 3.3v vcc power supply current 8 ma all transmitters r l = 3k?, t a = +25c shutdown supply current 0.01 5 a vcc = 3.3v, t a = +25c v cc = +3.3v + 10%; cap on (v+) and (v-) = 1.0 f, c1 = c2 = 0.1f; t min to t max unless otherwise noted .
4 exar corporation 48720 kato road, fremont ca, 94538 ? 510-668-7017 ? www.exar.com sp385e_100_030811 electrical characteristics v cc = +3.3v + 10%; cap on (v+) and (v-) = 1.0 f, c1 = c2 = 0.1f; t min to t max unless otherwise noted . parameter min. ty p. max. units conditions ttl input input logic threshold low 0.8 v txin, on/off input logic threshold high 2.0 v txin, on/off logic pullup current 15 200 a t in = 0v maximum data rate 120 kbps c l = 2500pf, r l = 3k? ttl output ttl/cmos output voltage low 0.4 v i out = 3.2ma, vcc = 5.0v ttl/cmos output voltage high 3.5 v i out = -1.0ma, vcc = 5.0v leakage current + 0.05 + 10 a on/off = 0v, 0v v out vcc, t a = 25 c eia-232 output output voltage swing + 5.0 + 9 v all transmitter outputs loaded with 3k? to gnd power-off output resis - tance 300 ? v cc = 0v, v out = + 2v output short-circuit current + 18 ma infnite duration eia-232 input input voltage range -15 15 v input threshold low 0.8 1.2 v v cc = 5v, t a = +25c input threshold high 1.7 2.4 v v cc = 5v, t a = +25c input hysteresis 0.2 0.5 1.0 v v cc = 5v, t a = +25c input resistance 3 5 7 k? v in = 15v to -15v dynamic characteristics propagation delay 1.5 s rs-232 to ttl instantaneous slew rate 30 v/s c l = 10pf, r l = 3k? - 7k?: t a = +25c transition-region slew rate 10 v/s cl = 2500pf, r l = 3k?; measured from +3v to -3v or -3v to +3v output enable time 400 ns output disable time 250 ns power requirements vcc power supply current 10 15 ma no load, t a = +25c; vcc = 5v vcc power supply current 25 ma all transmitters r l = 3k?, t a = +25c shutdown supply current 1 10 a vcc = 5v, t a = +25c
exar corporation 48720 kato road, fremont ca, 94538 ? 510-668-7017 ? www.exar.com sp385e_100_030811 5 ty pical performance characteristics 0 2 4 6 8 1 0 1 2 1 4 load current (ma) v? v oltage (v olts) -3 -4 -5 -6 -7 -8 -9 -10 -1 1 v cc = 5v v cc = 4v 0 5 10 15 20 load current (ma) 0 6 8 10 12 v+ (v olts) 2 4 25 30 35 40 v cc = 4v v cc = 5v -55 -40 0 2 5 7 0 8 5 125 t emperature ( c ) 0 5 10 15 20 25 30 i cc (ma) v cc = 5v v cc = 4v v cc = 3v 4.5 4.75 5.0 5.25 5.5 v cc (v olts) 6.8 7.4 7.6 7.8 8.0 8.2 8.4 v oh (v olts) 7.0 7.2 load current = 0m a t a = 25 c pinout on/off v gn d t ou t r in r ou t t in t in r ou t n/ c c + v+ c - c + c - v- t ou t r in 2 1 2 3 4 5 6 8 18 1 16 15 14 13 12 11 10 1 1 cc 2 2 sp385e 2 1 2 2 1 1 1 on/off v gn d t ou t r in r ou t t in t in r ou t n/ c n/ c c + v+ c - c + c - v- t out r in n/ c 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 1 1 cc 2 2 sp385e 2 1 2 2 1 1 1 2 18-pin wsoic 20-pin ssop
6 exar corporation 48720 kato road, fremont ca, 94538 ? 510-668-7017 ? www.exar.com sp385e_100_030811 ty pical operating circuit r 2 10 9 r in r out 2 r 1 13 14 r in r out 1 t 2 11 8 t out 2 t 1 12 15 t out 1 16 400k 400k ttl/cmos inputs rs232 outputs 4 2 c + 7 17 v v+ + + 0.1f 6.3v +5v inpu t 3 ttl/cmos outputs rs232 inputs 2 1 5k 16v 5k 6 5 c + + 0.1f 16v +5v to +10v vo ltage doubler 10f sp385e + 18 on/of f + 16v soic package +10v to -10v vo ltage inverter v- t in 2 t in 1 gnd 1.0f 1.0f r 2 12 9 r in r out 2 r 1 15 16 r in r out 1 t 2 13 8 t out 2 t 1 14 17 t out 1 18 400k 400k ttl/cmos inputs rs232 outputs 4 2 c + 7 19 v v+ + + 0.1f 6.3v +5v inpu t 3 ttl/cmos outputs rs232 inputs 2 1 5k 16v 5k 6 5 c + + 0.1f 16v +5v to +10v vo ltage doubler 10f sp385e + 20 on/of f + 16v ssop package +10v to -10v vo ltage inverter v- t in 2 t in 1 gnd 1.0f 1.0f
exar corporation 48720 kato road, fremont ca, 94538 ? 510-668-7017 ? www.exar.com sp385e_100_030811 7 features the exar sp385e is a +3v or +5v eia-232/ eia-562 line transceiver. it is a pin-for-pin alternative for the sp310a and will operate in the same socket with capacitors ranging from 0.1f to 10f, either polarized or nonCpolar - ized, in +3v supplies. the sp385e offers the same features such as 120kbps guaranteed transmission rate, increased drive current for longer and more fexible cable confgurations, low power dissipation and overall ruggedized construction for commercial and industrial environments. the sp385e also includes a shutdown feature that tri-states the drivers and the receivers. the sp385e includes a charge pump voltage converter which allows it to operate from a single +3.3v or +5v supply. these convert - ers double the v cc voltage input in order to generate the eia-232 or eia-562 output levels. for +5v operation, the sp385e driver out - puts adhere to all eia-232d and ccitt v.28 specifcations. while at +3.3v operation, the outputs adhere to eia-562 specifcations. due to exar's effcient charge pump design, the charge pump levels and the driver outputs are less noisy than other 3v eia-232 transceivers. the sp385e has a single control line which simultaneously shuts down the internal dc/dc converter and puts all transmitter and receiver outputs into a high impedance state. the sp385e is available in 18-pin plastic soic and 20-pin plastic ssop packages for operation over commercial and industrial temperature ranges. please consult the factory for surface-mount packaged parts supplied on tape-on-reel as well as parts screened to mil- m-38510. the sp385e is ideal for +3.3v battery ap - plications requiring low power operation. the charge pump strength allows the drivers to provide 4.0v signals, plenty for typical eia- 232 applications since the eia-232 receivers have input sensitivity levels of less than 3v. theor y of operation the sp385e device is made up of three basic circuit blocks 1) a driver/transmitter, 2) a receiver and 3) a charge pump. driver/transmitter the drivers are inverting transmitters, which accept ttl or cmos inputs and output the rs-232 signals with an inverted sense relative to the input logic levels. typically the rs-232 output voltage swing is 9v for 5v supply and 4.2v for 3.3v supply. even under worst case loading conditions of 3k? and 2500pf, the output is guaranteed to be 5v for a 5v supply and 3.7v for a 3.3v supply which adheres to eia-232 and eia-562 specifcations, respec - tively. the transmitter outputs are protected against infnite short-circuits to ground without degradation in reliability. the instantaneous slew rate of the transmit - ter output is internally limited to a maximum of 30v/s in order to meet the standards [eia 232-d 2.1.7, paragraph (5)]. however, the transition region slew rate of these enhanced products is typically 10v/s. the smooth tran - sition of the loaded output from vol to voh clearly meets the monotonicity requirements of the standard [eia 232-d 2.1.7, paragraphs (1) & (2)]. receivers the receivers convert rs-232 input signals to inverted ttl signals. since the input is usually from a transmission line, where long cable lengths and system interference can degrade the signal, the inputs have a typical hyster - esis margin of 500mv. this ensures that the receiver is virtually immune to noisy transmis - sion lines. the input thresholds are 0.8v minimum and 2.4v maximum, again well within the 3v rs- 232 requirements. the receiver inputs are also protected against voltages up to 15v. should an input be left unconnected, a 5k? pull-down resistor to ground will commit the output of the receiver to a high state. in actual system applications, it is quite pos - sible for signals to be applied to the receiver inputs before power is applied to the receiver circuitry. this occurs for example when a pc user attempts to print only to realize the printer wasnt turned on. in this case an rs-232 signal from the pc will appear on the receiver input at the printer. when the printer power is turned on, the receiver will operate normally. all of these enhanced devices are fully protected.
8 exar corporation 48720 kato road, fremont ca, 94538 ? 510-668-7017 ? www.exar.com sp385e_100_030811 charge pump the charge pump is a exarCpatented design (5,306,954) and uses a unique approach compared to older lessCeffcient designs. the charge pump still requires four external capaci - tors, but uses a fourCphase voltage shifting technique to attain symmetrical 10v power supplies. there is a freeCrunning oscillator that controls the four phases of the voltage shifting. a description of each phase follows. phase 1 v ss charge storage during this phase of the clock cycle, the positive side of capacitors c1 and c2 are initially charged to +5v. cl+ is then switched to ground and the charge in c1C is transferred to c2C. since c2+ is con - nected to +5v, the voltage potential across capacitor c2 is now 10v. phase 2 v ss transfer phase two of the clock con - nects the negative terminal of c2 to the v ss storage capacitor and the positive terminal of c2 to ground, and transfers the generated Cl0v to c3. simultaneously, the positive side of capacitor c 1 is switched to +5v and the nega - tive side is connected to ground. phase 3 v dd charge storage the third phase of the clock is identical to the frst phase the charge transferred in c1 produces C5v in the negative terminal of c1, which is applied to the negative side of capacitor c2. since c2+ is at +5v, the voltage potential across c2 is l0v. phase 4 v dd transfer the fourth phase of the clock connects the negative terminal of c2 to ground, and transfers the generated l0v across c2 to c4, the v dd storage capacitor. again, simultaneously with this, the positive side of capacitor c1 is switched to +5v and the negative side is connected to ground, and the cycle begins again. since both v+ and vC are separately gener - ated from v cc ; in a noCload condition v+ and vC will be symmetrical. older charge pump approaches that generate vC from v+ will show a decrease in the magnitude of vC com - pared to v+ due to the inherent ineffciencies in the design. the clock rate for the charge pump typically operates at 15khz. the external capacitors can be as low as 0.1f with a 16v breakdown voltage rating. figure 1. charge pump waveform +10v a) c2+ gnd gnd b) c2C C10v
exar corporation 48720 kato road, fremont ca, 94538 ? 510-668-7017 ? www.exar.com sp385e_100_030811 9 figure 3. charge pump phase 2 v cc = +5 v v ss storage capacitor v dd storage capacit o r c 1 c 2 c 3 c 4 + + + + ? ? ? ? -10v v cc = +5v ?5v ?5v +5v v ss storage capacitor v dd storage capacitor c 1 c 2 c 3 c 4 + + + + ? ? ? ? figure 2. charge pump phase 1 figure 4. charge pump phase 3 v cc = +5v ?5v ?5v +5v v ss storage capacitor v dd storage capacitor c 1 c 2 c 3 c 4 + + + + ? ? ? ? figure 5. charge pump phase 4 v cc = +5 v v ss storage capacitor v dd storage capacit o r c 1 c 2 c 3 c 4 + + + + ? ? ? ? +10v shutdown (on/off) the sp385e has a shut-down/standby mode to conserve power in battery-powered systems. to activate the shutdown mode, which stops the operation of the charge pump, a logic "0" is applied to the appropriate control line. the shut - down mode is controlled on the sp385e by a logic "0" on the on/off control line (pin 18 for the soic and pin 20 for the ssop packages); this puts the transmitter outputs in a tri-state mode.
10 exar corporation 48720 kato road, fremont ca, 94538 ? 510-668-7017 ? www.exar.com sp385e_100_030811 esd t olerance the sp385e device incorporates ruggedized esd cells on all driver output and receiver input pins. the esd structure is improved over our previous family for more rugged applications and environments sensitive to electro-static dis - charges and associated transients. the improved esd tolerance is at least + 15kv without damage nor latch-up. there are different methods of esd testing ap - plied: a) mil-std-883, method 3015.7 b) iec61000-4-2 air-discharge c) iec61000-4-2 direct contact the human body model has been the generally accepted esd testing method for semi-con - ductors. this method is also specified in mil-std-883, method 3015.7 for esd testing. the premise of this esd test is to simulate the human bodys potential to store electro-static energy and discharge it to an integrated circuit. the simulation is performed by using a test model as shown in figure 6. this method will test the ics capability to withstand an esd transient during normal handling such as in manufacturing areas where the ic's tend to be handled frequently. the iec-61000-4-2, formerly iec801-2, is gen - erally used for testing esd on equipment and systems. for system manufacturers, they must guarantee a certain amount of esd protection since the system itself is exposed to the outside environment and human presence. the premise with iec61000-4-2 is that the system is required to withstand an amount of static electricity when esd is applied to points and surfaces of the equipment that are accessible to personnel dur - ing normal usage. the transceiver ic receives most of the esd current when the esd source is applied to the connector pins. the test circuit for iec61000-4-2 is shown on figure 7. there are two methods within iec61000-4-2, the air discharge method and the contact discharge method. with the air discharge method, an esd voltage is applied to the equipment under test (eut) through air. this simulates an electrically charged person ready to connect a cable onto the rear of the system only to fnd an unpleasant zap just before the person touches the back panel. the high energy potential on the person discharges through an arcing path to the rear panel of the system before he or she even touches the sys - tem. this energy, whether discharged directly or through air, is predominantly a function of the discharge current rather than the discharge voltage. variables with an air discharge such as approach speed of the object carrying the esd potential to the system and humidity will tend to change the discharge current. for example, the rise time of the discharge current varies with the approach speed. the contact discharge method applies the esd current directly to the eut. this method was devised to reduce the unpredictability of the esd arc. the discharge current rise time is constant since the energy is directly transferred without the air-gap arc. in situations such as hand held sys - tems, the esd charge can be directly discharged to the equipment from a person already holding the equipment. the current is transferred on to the keypad or the serial port of the equipment directly and then travels through the pcb and fnally to the ic. figure 6. esd test circuit for human body model r c devic e under test dc power sourc e c s r s sw1 sw2
exar corporation 48720 kato road, fremont ca, 94538 ? 510-668-7017 ? www.exar.com sp385e_100_030811 11 device pin human body iec61000-4-2 tested model air discharge direct contact level driver outputs + 15kv + 15kv + 8kv 4 receiver inputs + 15kv + 15kv + 8kv 4 the circuit models in figures 6 and 7 represent the typical esd testing circuit used for all three methods. the c s is initially charged with the dc power supply when the frst switch (sw1) is on. now that the capacitor is charged, the second switch (sw2) is on while sw1 switches off. the voltage stored in the capacitor is then applied through r s , the current limiting resistor, onto the device under test (dut). in esd tests, the sw2 switch is pulsed so that the device under test receives a duration of voltage. for the human body model, the current limiting resistor (r s ) and the source capacitor (c s ) are 1.5k? an 100pf, respectively. for iec-61000-4-2, the current limiting resistor (r s ) and the source ca - pacitor (c s ) are 330? an 150pf, respectively. the higher c s value and lower r s value in the iec61000-4-2 model are more stringent than the human body model. the larger storage capaci - tor injects a higher voltage to the test point when sw2 is switched on. the lower current limiting resistor increases the current charge onto the test point. figure 8. esd test waveform for iec61000-4-2 figure 7. esd test circuit for iec61000-4-2 table 1. transceiver esd tolerance levels r s and r v add up to 330 for iec61000-4-2. r c devic e under test dc power sourc e c s r s sw1 sw2 r v contact-discharge model t = 0ns t = 30ns 0a 15a 30a i t
12 exar corporation 48720 kato road, fremont ca, 94538 ? 510-668-7017 ? www.exar.com sp385e_100_030811 package: 20 pin ssop
exar corporation 48720 kato road, fremont ca, 94538 ? 510-668-7017 ? www.exar.com sp385e_100_030811 13 package: 18 pin wsoic
14 exar corporation 48720 kato road, fremont ca, 94538 ? 510-668-7017 ? www.exar.com sp385e_100_030811 ordering information for tape and reel option add "/tr", example: sp385eet-l/tr. part number temp. range package sp385eca-l 0c to +70c 20 pin ssop sp385eca-l/tr 0c to +70c 20 pin ssop sp385ect-l 0c to +70c 18 pin wsoic sp385ect-l/tr 0c to +70c 18 pin wsoic sp385eea-l -40c to +85c 20 pin ssop sp385eea-l/tr -40c to +85c 20 pin ssop sp385eet-l -40c to +85c 18 pin wsoic sp385eet-l/tr -40c to +85c 18 pin wsoic
exar corporation 48720 kato road, fremont ca, 94538 ? 510-668-7017 ? www.exar.com sp385e_100_030811 15 revision history notice exar corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reli - ability. exar corporation assumes no representation that the circuits are free of patent infringement. charts and schedules contained herein are only for illustration purposes and may vary depending upon a user's specifc application. while the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. exar corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to signifcantly af fect its safety or effectiveness. products are not authorized for use in such applications unless exar corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized ; (b) the user assumes all such risks; (c) potential liability of exar corporation is adequately protected under the circumstances. copyright 2011 exar corporation datasheet march 2011 for technical support please email exar's serial technical support group at : serialtechsupport@exar.com reproduction, in part or whole, without the prior written consent of exar corporation is prohibited. date revision description 03/08/05 -- legacy sipex datasheet 03/08/11 1.0.0 convert to exar format, update ordering information and change esd specifcation to iec61000-4-2
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