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exar corporation 48720 kato road, fremont ca, 94538 ? (510) 668-7000 ? fax (510) 668-7017 ? www.exar.com sp337e 3.3v to 5v rs-232/rs-485/rs-422 multiprotocol transceiver march 2011 rev. 1.0.2 general description the sp337e is a dual mode serial transceiver containing both rs-232 and rs-485/422 line drivers and receivers. the rs-232 mode provides three drivers and five receivers to support all eight signals commonly used in the db9 serial port connector (3tx/5rx). in rs-485 mode the device features two independent high speed rs-485/422 transmit and receive channels (2tx/2rx). the default rs-485 configuration is full-duplex, but half-duplex operation can be obtained by tying together the tx and ri pins, and the txen and rxen signals. the sp337e is pin compatible to exar?s sp334. the sp337eb features a maximum data rate of 250kbps in rs-232 mode and a maximum data rate of 15mbps in rs-485. however, the sp337eu features a maximum data rate of 1mbps in rs-232 mode and a maximum data rate of 15mbps in rs-485 mode. the exar -patented high efficiency charge pumps (5,306,954) deliver true rs-232 driver output voltages from a single power supply from 3.3v to 5v. charge pump outputs are self-monitored to minimize power consumption. the sp337e requires only four 0.1 f capacitors for complete functionality. all rs-485 receivers or transceivers feature high impedance inputs which allow up to 256 transceivers on a single shared bus. when configured in rs-485 mode, each driver may be individually enabled or put into tri-state, simplifying use on shared buses or for bidirectional communication. the rs-485/422 drivers can be disabled (high-z output) by the txen enable pin. the rs-232 receiver outputs can be disabled by the rxen enable pin. all receivers have advanced failsafe protection to prevent oscillation when in puts are un-connected. in rs-232 mode, each receiver input has a 5k pull- down to ground. in rs -485 mode, receivers will default to output logic 1 if inputs are floating, shorted, or open but terminated. all driver outputs and receiver inputs are protected against esd strikes up to +/-15,000 volts. features ? 3.3v to 5v single supply operation ? robust +/-15kv esd protection human body model ? max data rate of 15mbps in rs-485 mode and up to 1mbps in rs-232 mode (sp337eu) ? 3 drivers, 5 receivers rs-232/v.28 ? 2 drivers, 2 receivers rs-485/rs-422 full-duplex configuration 1/8th unit load, up to 256 receivers on bus ? rs-485 advanced failsafe on open, short or terminated lines ? full differential driver tr i-state (hi-z) control ? receiver output tri-state control ? wsoic-28 or t ssop-28 package typical applications ? dual protocol serial ports (rs-232 or rs-485) ? industrial computers ? industrial and process control equipment ? point-of-sales equipment ? networking equipment ? hvac controls equipment ? building security equipment
f igure 1. t ypical rs-232 and rs-485 a pplication c ircuits ordering information p art n umber p ackage o perating t emperature r ange d evice s tatus sp337ebct-l 28-pin wsoic 0c to +70c active sp337ebcy-l 28-pin tssop 0c to +70c active sp337ebet-l 28-pin wsoic -40c to +85c active sp337ebey-l 28-pin tssop -40c to +85c active SP337EUCT-L 28-pin wsoic 0c to +70c active sp337eucy-l 28-pin tssop 0c to +70c active sp337euet-l 28-pin wsoic -40c to +85c active sp337euey-l 28-pin tssop -40c to +85c active sp337e 2 3.3v to 5v rs-232/rs-485/rs-422 multiprotocol transceiver rev. 1.0.2
sp337e 3 rev. 1.0.2 3.3v to 5v rs-232/rs-485/rs-422 multiprotocol transceiver pin descriptions pin assignments p in # p in n ame t ype d escription rs-232 rs-485/rs-422 1 ti3 input t3 driver ttl input t3 driver ttl input this pin has a 400k pull-up to vcc in both rs-232 and rs-485 modes. the pull-up is disabled in the sp337eu shutdown mode. 2 txen input x* only rs-485 mode this pin has a 400k pull-up to vcc in both rs-232 and rs-485 modes. the pull-up is disabled in the sp337eu shutdown mode. 3 tx4 output x* t3(z) inverting output 4 tx3 output t3 driver output t3(y) non-inverting output 5 vcc power power supply voltage, between 3.3v and 5v 6 tx1 output t1 driver output t1(y) non-inverting output 7 tx2 output t2 driver output t1(z) inverting output 8 gnd power ground 9 c1+ pump positive terminal of po sitive flying capacitor 10 v+ pump vdd storage capacitor 11 c2+ pump positive terminal of negative flying capacitor 12 c1- pump negative terminal of positive flying capacitor 13 c2- pump negative terminal of ne gative flying capacitor 14 v- pump vss storage capacitor 15 ri1 input r1 receiver input, 5k pull-down r1(b) receiver inverting input 16 ri2 input r2 receiver input, 5k pull-down r1(a) receiver non-inverting input 17 ri3 input r3 receiver input, 5k pull-down r3(a) receiver non-inverting input 18 ri4 input r4 receiver input, 5k pull-down r3(b) receiver inverting input 19 rx1 output r1 receiver output 20 rx2 output r2 receiver output x* 21 rx3 output r3 receiver output 22 rx4 output r4 receiver output x* 23 rx5 output r5 receiver output x* 24 ri5 input r5 receiver input, 5k pull-down x* 25 rs232 /rs485 input mode select, either rs-232 (low) or rs-485/422 (high) mode 26 rxen input receiver enable for both rs-232 and rs-485/422 mode (active low)
sp337e 4 3.3v to 5v rs-232/rs-485/rs-422 multiprotocol transceiver rev. 1.0.2 * pins marked with an x in the above table are ignor ed or "don?t care" in the listed mode, provided they do not exceed vcc or go below ground. so me of these pins have a pull-up to vcc which remains active in both rs-232 and rs-485 mode, but is disabled in the sp337eu shutdown mode. 27 ti1 input t1 driver input t1 driver input this pin has a 400k pull-up to vcc in both rs-232 and rs-485 modes. the pull-up is disabled in the sp337eu shutdown mode. 28 ti2 input t2 driver input x* this pin has a 400k pull-up to vcc in both rs-232 and rs-485 modes. the pull-up is disabled in the sp337eu shutdown mode. pin assignments p in #p in n ame t ype d escription rs-232 rs-485/rs-422
absolute maximum ratings these are stress ratings only and functional operation of the dev ice at these ratings or any ot her above those indicated in the operation sections to the specifications below is not implied. exposure to absolute maximu m rating conditions for extended periods of time may affect rel iability and cause permanent damage to the device. supply voltage v cc +6.0v receiver input v in (dc input voltage) -16v to +16v input voltage at ttl input pins -0.3v to vcc + 0.5v driver output voltage (from ground) -7.5v to +12.5v short circuit duration, txout to gnd continuous storage temperature range -65c to + 150c lead temperature (soldering, 10s) +300c power dissipation 28-pin soic-w (derate 17mw/c above +70c) 938mw power dissipation 28-pin tssop (derate 12mw/c above +70c) 657mw sp337e 5 rev. 1.0.2 3.3v to 5v rs-232/rs-485/rs-422 multiprotocol transceiver caution: esd (electrostatic discharge) sensitive device. permanent damage may occur on unconnected devices su bject to high energy electr ostatic fields. unused devices must be stored in conductive foam or shunts. personnel should be properly grounded prior to handling this device. the p rotective foam should be discharged to the destination so cket before devices are removed. electrical characteristics u nless otherwise noted : v cc = +3.3v +/-5% or +5.0v +/-5%, c1-c4 = 0.1 p f; t a = t min to t max . t ypical values are at v cc = 3.3v, t a = +25 o c. s ymbol p arameters m in . typ. m ax . u nits c onditions dc characteristics i cc supply current (rs-232) 1.5 6.0 ma no load, rs232/rs485 = 0v i cc supply current (rs-485) 7.0 15 ma no load, rs232/rs485 = vcc i cc vcc shutdown current (sp337eu only) 1.0 10.0 p a txen = 0v, rxen = vcc (sp337eu only) transmitter and logic input pins : pins 1, 2, 25, 26, 27, 28 v ih logic input voltage high 2.0 v vcc = 3.3v v ih logic input voltage high 2.4 v vcc = 5.0v v il logic input voltage low 0.8 v i il logic input leakage current 1.0 p a input high (vin = vcc) i pu logic input pull-up current 15.0 p a input low (vin = 0v) v hys logic input hysteresis 0.5 v rs-232 and rs-485/422 receiver ou tputs: pins 19, 20, 21, 22, 23 v oh receiver output voltage high vcc-0.6 v i out = 1.0ma v ol receiver output voltage low 0.4 v i out = -3.2ma
sp337e 6 3.3v to 5v rs-232/rs-485/rs-422 multiprotocol transceiver rev. 1.0.2 i oss receiver output shortcircuit current +/-40 +/-65 ma 0 < vo < vcc i oz receiver output leakage current +/-0.1 +/-1.5 a receivers disabled single-ended receiver inputs (rs-232) input voltage range -15 +15 v input threshold low 0.6 1.2 v v cc = 3.3v 0.8 1.5 v v cc = 5.0v input threshold high 1.5 2.0 v v cc = 3.3v 1.8 2.4 v v cc = 5.0v input hysteresis 0.5 v input resistance 3 5 7 k differential receiver in puts (rs-485 / rs-422) r in receiver input resistance 96 k -7v v cm + 12v v th receiver differential threshold -200 -125 -50 mv v th receiver input hysteresis 30 mv v cm = 0v i in input current 125 a v in = 12v -100 a v in = -7v single-ended driver outputs (rs-232) v o output voltage swing +/-5.0 +/-5.4 v output loaded with 3k to gnd +/-7.0 v no load output short circuit current +/-60 ma v o = 0v power off impedance 300 10m w vcc = 0v; v o = +/-2v differential driver ou tputs (rs-485 / rs-422) v od differential driver output (tx_out) 2 vcc v r l = 100 (rs-422), figure 2 1.5 vcc v r l = 54 (rs-485), figure 2 1.5 vcc v v cm = -7v, figure 3 1.5 vcc v v cm = +12v, figure 3 v od change in magnitude of differential output voltage -0.2 +0.2 v r l = 54 or 100 , figure 2 v oc driver commonmode output voltage 3 v r l = 54 or 100 , figure 2 v oc change in magnitude of common mode output voltage 0.2 v r l = 54 or 100 , figure 2 i osd driver output short circuit current +/-250 ma v = +12v to -7v, figure 4 i o output leakage current +/-100 a txen = 0v or shutdown, v o = +12v to -7v timing characteristics u nless otherwise noted : v cc = +3.3v +/-5% or +5.0v +/-5%, c1-c4 = 0.1 f; t a = t min to t max . t ypical values are at v cc = 3.3v, t a = +25 o c. s ymbol p arameters m in .typ.m ax .u nits c onditions
sp337e 7 rev. 1.0.2 3.3v to 5v rs-232/rs-485/rs-422 multiprotocol transceiver rs-232 (sp337eb only) data rate = 250kbps, one transmitter switching maximum data rate 250 kbps r l = 3k , c l = 2500pf t phl , t plh receiver propagation delay 100 ns c l = 150pf, figures 20 and 21 ? t phl -t plh ? receiver skew 100 ns c l = 150pf, figures 20 and 21 t phl , t plh driver propagation delay 800 ? t phl -t plh ? driver skew 400 ns receiver output enable time 400 ns receiver output disable time 400 ns t thl, t tlh transition-region slew rate from +3.0v to -3.0v or -3.0v to +3.0v 4 30 v/ s vcc = 3.3v, r l = 3k to 7k , c l = 150pf to 2500pf, figures 18 and 19 rs-232 (sp337eu only) data rate = 1mbps, one transmitter switching maximum data rate 1 mbps r l = 3k , c l = 250pf t phl , t plh receiver propagation delay 100 ns c l = 150pf, figures 20 and 21 ? t phl -t plh ? receiver skew 100 ns c l = 150pf, figures 20 and 21 t phl , t plh driver propagation delay 250 ? t phl -t plh ? driver skew 150 ns receiver output enable time 400 ns receiver output disable time 400 ns t thl, t tlh transition-region slew rate from +3.0v to -3.0v or -3.0v to +3.0v 50 v/ s vcc = 3.3v, r l = 3k , c l = 150pf, figures 18 and 19 rs-485/rs-422 (sp337eb and sp337eu) data rate = 15mbps, one transmitter switching maximum data rate 15 20 mbps r diff = 54 , c l = 50pf t dphl , t dplh differential output propagation delay time 60 120 ns figures 5 and 6 t r, t f driver rise and fall time 15 25 ns figures 5 and 6 ? t dphl - t dplh ? driver propagation delay skew 10 ns figures 5 and 6 t dzh , t dzl driver output enable time 400 ns figures 7, 8, 9 and 10 t dhz , t dlz driver output disable time 400 ns figures 7, 8, 9 and 10 t phl , t plh receiver propagation delay 80 150 ns figures 11 and 12 t zh receiver enable to output high 100 200 ns figures 13 and 14 t zl receiver enable to output low 100 200 ns figures 13 and 15 t hz receiver output high to disable 100 200 ns figures 13 and 16 t lz receiver output low to disable 100 200 ns figures 13 and 17 u nless otherwise noted : v cc = +3.3v +/-5% or +5.0v +/-5%, c1-c4 = 0.1 f; t a = t min to t max . t ypical values are at v cc = 3.3v, t a = +25 o c. s ymbol p arameters m in .typ.m ax .u nits c onditions
sp337e 8 3.3v to 5v rs-232/rs-485/rs-422 multiprotocol transceiver rev. 1.0.2 rs-485/rs-422 shutdown feature applies to sp337eu only t dzzv shutdown to driver output valid 100 400 ns t dshutdwn driver time to shutdown 100 ns t rzzv shutdown to receiver output valid 400 800 ns t rshutdwn receiver time to shutdown 100 ns esd protection esd protection for tx and ri pins 3, 4, 6, 7, 15, 16, 17, 18, 24 +/-15 kv human body model all other pins +/-2 kv human body model f igure 2. rs-485 d river dc t est c ircuit r l /2 r l /2 v oc t v cc v od di f igure 3. rs-45 d river c ommon m ode l oad test a b tx di = 0 or vcc 60 de = 3.3v v od 375 375 v cm u nless otherwise noted v cc = +3.3v +/-5% or +5.0v +/-5%, c1-c4 = 0.1 p f t a = t min to t ma . t pical values are at v cc = 3.3v, t a = +25 o c. s mbol p arameters m in .tp.m a .u nits c onditions
f igure 4. rs-485 d river o utput s hort c ircuit t est a d di = 0 or vcc b en = 0 or vcc i os d -7v to +12v v f igure 5. rs-45 d river p ropagation d ela t est c ircuit a b tx di r l 54 c l 50pf 3.3v v od f igure 6. rs-45 d river t iming d iagram vcc 0v di a b v o + v diff v a C v b 0v v o C vcc/2 vcc/2 t plh t f t r v o 1/2v o 1/2v o t phl t skew = |t dplh - t dphl | t dplh t dphl 10% 90% 10% 90% sp337e 9 rev. 1.0.2 3.3v to 5v rs-232/rs-485/rs-422 multiprotocol transceiver
f igure 7. rs-485 d river e nable and d isable t est c ircuit generator 50 s1 r l = 500 out c l = 50pf tx vcc b a di f igure . rs-45 d river e nable and d isable t iming d iagram de out vcc/2 t dzh v om = (v ol + vcc)/2 0.25v vcc 0 0 t dhz f igure 9. rs-45 d river e nable and d isable t est c ircuit 2 generator 50 s1 r l = 500 out c l = 50pf tx 0 b a di vcc sp337e 10 3.3v to 5v rs-232/rs-45/rs-422 multiprotocol transceiver rev. 1.0.2
f igure 10. rs-485 d river e nable and d isable t iming d iagram 2 de out vcc/2 t dzl v om = (v ol + vcc)/2 0.25v vcc 0 v ol t dlz f igure 11. rs-45 r eceiver p ropagation d ela t est c ircuit out r a b v id re c l 15pf f igure 12. rs-45 r eceiver p ropagation d ela t iming d iagram b a out t phl t plh +1v -1v v oh v ol 1.5v sp337e 11 rev. 1.0.2 3.3v to 5v rs-232/rs-485/rs-422 multiprotocol transceiver
f igure 13. rs-485 r eceiver e nable and d isable t imes t est c ircuit 1.5v -1.5v s3 a generator 50 c l = 15pf r 1k s1 s2 vcc b re out f igure 14. rs-45 r eceiver e nable and d isable t imes t iming d iagram 1 3v 1.5v 0v re out s1 is open, s2 is closed, s3 = 1.5v v oh t zh v oh /2 f igure 15. rs-45 r eceiver e nable and d isable t imes t iming d iagram 2 3v 0v 1.5v v cc re out s1 is closed, s2 is open, s3 = -1.5v t zl v ol = v cc /2 v ol sp337e 12 3.3v to 5v rs-232/rs-45/rs-422 multiprotocol transceiver rev. 1.0.2
f igure 16. rs-485 r eceiver e nable and d isable t imes t iming d iagram 3 3v 1.5v 0v re out s1 is open, s2 is closed, s3 = 1.5v v oh t hz 0.25v f igure 17. rs-45 r eceiver e nable and d isable t imes t iming d iagram 4 3v 0v 1.5v v cc re out s1 is closed, s2 is open, s3 = -1.5v t lz v ol 0.25v f igure 1. rs-232 d river o utput s lew r ate t est c ircuit generator 50 r l out c l tx sp337e 13 rev. 1.0.2 3.3v to 5v rs-232/rs-485/rs-422 multiprotocol transceiver
f igure 19. rs-232 d river o utput s lew r ate t iming d iagram input out 1.5v t thl +3v 3v 0 v ol t tlh -3v f igure 20. rs-232 r eceiver p ropagation d ela t est c ircuit generator 50 out c l rx f igure 21. rs-232 r eceiver p ropagation d ela t iming d iagram input out 1.5v t phl v oh +3v 50% t plh -3v 1.5v 50% v ol sp337e 14 3.3v to 5v rs-232/rs-45/rs-422 multiprotocol transceiver rev. 1.0.2
t able 1: sp337eb rs232 /rs485 txen rxen operation charge pump driver and receiver low ignored low rs-232 3t/5r on receivers enabled low ignored high rs-232 3t/5r on receivers disabled (high-z output) high low low rs-485/422 full-duplex 2t/2r on drivers disabled (high-z output); receivers enabled high high high rs-485/422 full-duplex 2t/2r on drivers enabled; receivers disabled (high-z output) high low high rs-485/422 full-duplex 2t/2r on drivers disabled (high z output); receivers disabled (high z output) high high low rs-485/422 full-duplex 2t/2r on drivers enabled; receivers enabled sp337e 15 rev. 1.0.2 3.3v to 5v rs-232/rs-485/rs-422 multiprotocol transceiver sp337e mode configuration tables t able 2: sp337eu rs232 /rs485 txen rxen operation charge pump driver and receiver low ignored low rs-232 3t/5r on receivers enabled low ignored high rs-232 3t/5r on receivers disabled (high-z output) high low low rs-485/422 full-duplex 2t/2r on drivers disabled (high-z output); receivers enabled high high high rs-485/422 full-duplex 2t/2r on drivers enabled; receivers disabled (high-z output) high low high rs-485/422 full-duplex 2t/2r off (shutdown) drivers disabled (high z output); receivers disabled (high z output) high high low rs-485/422 full-duplex 2t/2r on drivers enabled; receivers enabled
f igure 22. 28 p in wsoic p ackage o utline d rawing sp337e 16 3.3v to 5v rs-232/rs-485/rs-422 multiprotocol transceiver rev. 1.0.2
f igure 23. 28 p in tssop p ackage o utline d rawing sp337e 17 rev. 1.0.2 3.3v to 5v rs-232/rs-485/rs-422 multiprotocol transceiver
revision history d ate r evision d escription december 2010 1.0.0 production release. december 2010 1.0.1 update esd information. march 2011 1.0.2 correct figure 1 rs-485 driver type error. 18 notice exar corporation reserves the right to make changes to the products contained in this publicat ion in order to improve design, performanc e or reliability. exar corp oration assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infr ingement. charts and schedules contai ned here in are only for illustration purposes and may vary depending upon a user?s specific application. while the information in this publication has been carefully ch ecked; no responsibility, however , is assumed for inaccuracies. exar corporation does not re commend the use of any of its products in life suppo rt applications where the failure or malfunction of the product can reasonably be ex pected to cause failure of the life support system or to significantly affect its safety or effectiveness. products ar e not authorized for use in such applications unless exar corporation receives , in writing, assuranc es to its satisfaction that: (a) th e risk of injury or damage has been minimized; (b) th e user assumes all such ris ks; (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 co rporation is prohibited. sp337e 3.3v to 5v rs-232/rs-485/rs-422 multiprotocol transceiver rev. 1.0.2

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