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exar corporation 48720 kato road, fremont ca, 94538 ? (510) 668-7000 ? fax (510) 668-7017 ? www.exar.com sp336e 3.3v / 5v programmable rs-232/rs-485/rs-422 serial transceiver january 2011 rev. 1.0.1 general description the sp336e is a monolithic serial multi-transceiver device that contains both rs-232 and rs-485/rs- 422 line drivers and receivers. the configuration of the sp336e can be reconfigured into eight operating modes including rs-232 only (4tx/4rx), rs-485/ rs-422 only (2tx/2rx) full or half duplex, two rs- 232/rs-485 mixed modes. two shutdown modes and a diagnostic loop-back mode. modes may be selected at any time by ch anging the logic state of the three mode pins. the device can implement a dual- mode serial port, mixed mode ports or as an interface signal translator. the exar charge pumps deliver true rs-232 driver output voltages from a single power supply at either 3.3v or 5v. the sp336e requires only four 0.1 f capacitors for charge pump. a slew rate control pin configures driver outputs for either high data rate or slew-controlled data rates. slew- controlled outputs minimize problems with reflections and ringing on long or un-terminated cables. all rs- 485 receivers or transceivers feature high impedance which allow up to 256 transceivers on a shared bus. when configured in rs-485/rs-422 mode, each driver may be individually enabled or put into tri-state, simplifying use on shared buses or bidirectional communication. all receiver s have advanced failsafe protection to prevent oscilla tion when inputs are un- connected. in rs-232 mode each receiver input has a 5k ohm pull-down to grou nd. differential 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 or 5v single supply operation ? robust +/-15kv esd protec tion (iec 61000-4-2 air gap) ? software selectable mode selection ? up to 4 drivers, 4 receivers rs-232/v.28 ? up to 2 drivers, 2 receivers rs-485/rs-422 full or half duplex configurations 1/8th unit load, up to 256 receivers on bus ? mixed rs-232/rs-485 modes ? pin programmable slew rate for reduced emi ? rs-485 advanced failsafe on open, short or terminated lines ? diagnostic loop-back function ? 28 pin soic or tssop packaging typical applications ? factory automation equipment ? security networks ? industrial/process control networks ? point-of-sales equipment ? gaming machines ? serial protocol translator s (ex. rs-232 to rs-485/ rs-422) ? embedded industrial pc?s ? building environmental control systems (ex. hvac) ? cable repeaters / port extenders / hubs
f igure 1. t ypical rs-232 a pplication c ircuit sp336e 2 3.3v / 5v programmable rs-232/rs-485/rs-422 serial transceiver rev. 1.0.1
f igure 2. p in o ut a ssignment 2 1 3 4 5 6 7 8 9 10 11 12 14 13 15 16 17 18 19 20 21 22 23 24 25 26 27 28 soic/ tssop sp336e t3_in t2_in t1_in slew mode_0 mode_2 r4_out r3_out r2_out r1_out r4_in r3_in r2_in r1_in t4_in mode_1 t4_out t3_out vcc t1_out t2_out gnd c1+ v+ c2+ c1- c2- v- ordering information p art n umber p ackage o perating t emperature r ange d evice s tatus sp336ect-l 28-pin soic-w 0c to +70c active sp336ecy-l 28-pin tssop 0c to +70c active sp336eet-l 28-pin soic-w -40c to +85c active sp336eey-l 28-pin tssop -40c to +85c active sp336e 3 rev. 1.0.1 3.3v / 5v programmable rs-232 /rs-485/rs-422 serial transceiver
f igure 3. t ypical rs-485 a pplication c ircuit sp336e 4 3.3v / 5v programmable rs-232/rs-485/rs-422 serial transceiver rev. 1.0.1
sp336e 5 rev. 1.0.1 3.3v / 5v programmable rs-232 /rs-485/rs-422 serial transceiver pin descriptions pin assignments p in n umber p in n ame t ype d escription s ingle e nded f ull -d uplex h alf -d uplex 1 t4_in i t4 driver ttl input. t3 driver enable active high. t3 driver enable active high, r3 enable active low. 2 mode_1 i mode configuration pin 1. 3 t4_out o t4 driver output. t3(b) output. t3(b) output, r3(b) input. 4 t3_out o t3 driver output. t3(a) output. t3(a) output, r3(a) input. 5 vcc pwr power supply voltage. 6 t1_out o t1 driver output. t1(a) output. t1(a) output, r1(a) input. 7 t2_out o t2 driver output. t1(b) output. t1(b) output, r1(b) input. 8 gnd pwr ground. 9 c1+ pmp positive terminal of po sitive flying capacitor. 10 v+ pmp vdd storage capacitor. 11 c2+ pmp positive terminal of negative flying capacitor. 12 c1- pmp negative terminal of positive flying capacitor. 13 c2- pmp negative terminal of negative flying capacitor. 14 v- pmp vss storage capacitor. 15 r1_in i r1 receiver input. r1(a) receiver input. high impedance. 16 r2_in i r2 receiver input. r1(b) receiver input. r2 receiver input. 17 r3_in i r3 receiver input. r3(a) receiver input. high impedance. 18 r4_in i r4 receiver input. r3(b) receiver input. r4 receiver input. 19 r1_out o r1 receiver output. 20 r2_out o r2 receiver output. high impedance. r2 receiver output. 21 r3_out o r3 receiver output. 22 r4_out o r4 receiver output. high impedance. r4 receiver output. 23 mode_2 i mode configuration pin 2. 24 mode_0 i mode configuration pin 0. 25 slew i slew rate control. logic low input will limit driver slew from either rs-232 or rs-485 to 250kbps. 26 t1_in i t1 driver input.
sp336e 6 3.3v / 5v programmable rs-232/rs-485/rs-422 serial transceiver rev. 1.0.1 pin type: i=input, o=output, pwr=power supply, pmp = charge pump. 27 t2_in i t2 driver input. t1 driver enable active high. t1 driver enable active high and r1 receiver enable active low. 28 t3_in i t3 driver input. pin assignments p in n umber p in n ame t ype d escription s ingle e nded f ull -d uplex h alf -d uplex
sp336e 7 rev. 1.0.1 3.3v / 5v programmable rs-232 /rs-485/rs-422 serial transceiver mode configuration o peration : rs-232 m ode m ixed -p rotocol f ull d uplex m ode (m0, m1, m2) 4t/4r rs-232 2t/2r rs-232 & 1t/1r rs-485 001 011
sp336e 8 3.3v / 5v programmable rs-232/rs-485/rs-422 serial transceiver rev. 1.0.1 mode configuration o peration : l ow p ower s hutdown rs-485/rs-422 f ull d uplex a ll i/o at h igh impedance m ode (m0, m1, m2) (continued) 2t/2r rs-485 111 101
sp336e 9 rev. 1.0.1 3.3v / 5v programmable rs-232 /rs-485/rs-422 serial transceiver mode configuration o peration : l oop -b ack txi n to rxo ut m ixed -p rotocol h alf d uplex txo ut and rxi n h igh i mpedance m ode (m0, m1, m2) (continued) 2t/3r rs-232 & 1t/1r rs-485 000 010
sp336e 10 3.3v / 5v programmable rs-232/rs-485/rs-422 serial transceiver rev. 1.0.1 mode configuration o peration : l ow p ower , 4 rx a ctive rs-485/rs-422 h alf d uplex d rivers at h igh i mpedance m ode (m0, m1, m2) (continued) 2t/2r rs-485 & 2r rs-232 110 100
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) -15v to +15v 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 sp336e 11 rev. 1.0.1 3.3v / 5v programmable rs-232 /rs-485/rs-422 serial 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%; 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) 2 30 ma no load, mode = 001. i cc supply current (rs-485) 6.5 20 ma no load, mode = 101. i cc vcc shutdown current 1 20 p a mode = 111. transmitter and logic input pins: pi ns 1, 2, 23, 24, 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 pull-up current +/-15 p a v hys logic input hysteresis 0.5 v rs-232 and rs-485/422 receiver outputs: pins 19, 20, 21, 22 v oh receiver output voltage high vcc- 0.6 v i out = -1.5ma. v ol receiver output voltage low 0.4 v i out = 2.5ma. i oss receiver output short-circuit current +/-20 +/-60 ma 0 < vo < vcc.
sp336e 12 3.3v / 5v programmable rs-232/rs-485/rs-422 serial transceiver rev. 1.0.1 i oz receiver output leakage current +/- 0.05 +/-1 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 volt - age -200 -125 -50 mv v th receiver input hysteresis 30 mv v cm = 0v. i in input current 125 a de = 0v, v in = 12v, full-duplex. -100 a de = 0v, v in = -7v, full-duplex. single-ended driver outputs (rs-232) v o output voltage swing +/-5.0 +/-5.4 v output loaded with 3k to gnd. +/-6.0 v no load output. short circuit current +/-60 ma v o = 0v. power off impedance 300 10m 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 4. 1.5 vcc v r l = 54 (rs-485), figure 4. 1.5 vcc v v cm = -7v, figure 5. 1.5 vcc v v cm = +12v, figure 5. v od change in magnitude of differential output voltage -0.2 +0.2 v r l = 54 or 100 , figure 4. v oc driver common mode output volt - age 3 v r l = 54 or 100 , figure 4. v oc change in magnitude of common mode output voltage 0.2 v r l = 54 or 100 , figure 4. driver output short circuit current +/-250 ma v = +12v to -7v, figure 6. i o output leakage current +/-100 a de = 0v or shutdown, v o = +12v to -7v. u nless otherwise noted : v cc = +3.3v +/-5% or +5.0v +/-5%; 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
sp336e 13 rev. 1.0.1 3.3v / 5v programmable rs-232 /rs-485/rs-422 serial transceiver esd protection esd protection for rx_in and tx_out pins +/-15 kv iec 61000-4-2 air discharge. +/-8 kv iec 61000-4-2 contact discharge. +/-15 kv human body model. all other pins +/-2 kv human body model. timing characteristics rs-232 (slew = gnd, 250kbps, one transmitter switching) maximum data rate 250 kbps r l = 3k , c l = 1000pf. t phl , t plh receiver propagation delay 100 ns c l = 150pf. ? t phl -t plh ? receiver skew 50 ns c l = 150pf. ? t phl -t plh ? driver skew 100 ns t thl, t tlh transition-region slew rate from +3.0v to -3.0v or -3.0v to +3.0v 6 30 v/ s vcc = 3.3v, t a =25c, r l = 3k to 7k , c l = 150pf to 1000pf, figures 20 and 21. rs-232 (slew = vcc, 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 22 and 23. ? t phl -t plh ? receiver skew 50 ns c l = 150pf. ? t phl -t plh ? driver skew 25 ns t thl, t tlh transition-region slew rate from +3.0v to -3.0v or -3.0v to +3.0v 90 v/ s vcc = 3.3v, r l = 3k to 7k , c l = 150pf to 1000pf. rs-485/rs-422 (slew = gnd, 250kbps, one transmitter switching) maximum data rate 250 kbps r diff = 54 , c l = 50pf. t dphl , t dplh differential output propagation delay time 250 1500 ns figures 7 and 8. t r, t f driver rise and fall time 200 1500 ns figures 7 and 8. ? t dphl - t dplh ? driver propagation delay skew 200 ns figures 7 and 8. t dzh , t dzl driver output enable time 1500 ns figures 9, 10, 11 and 12. t dhz , t dlz driver output disable time 1500 ns figures 9, 10, 11 and 12. t phl , t plh receiver propagation delay 150 ns figures 13 and 14. t zh receiver enable to output high 50 ns figures 15 and 16. t zl receiver enable to output low 50 ns figures 15 and 17. t hz receiver output high to disable 50 ns figures 15 and 18. u nless otherwise noted : v cc = +3.3v +/-5% or +5.0v +/-5%; 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
sp336e 14 3.3v / 5v programmable rs-232/rs-485/rs-422 serial transceiver rev. 1.0.1 t lz receiver output low to disable 50 ns figures 15 and 19. rs-485/rs-422 (slew = vcc, 10mbp s, one transmitter switching) maximum data rate 10 mbps r diff = 54 , c l = 50pf. t dphl , t dplh differential output propagation delay time 60 120 ns figures 7 and 8. t r, t f driver rise and fall time 10 25 ns figures 7 and 8. ? t dphl - t dplh ? driver propagation delay skew 10 ns figures 7 and 8. t dzh , t dzl driver output enable time 900 ns figures 9, 10, 11 and 12. t dhz , t dlz driver output disable time 900 ns figures 9, 10, 11 and 12. t phl , t plh receiver propagation delay 150 ns figures 13 and 14. t zh receiver enable to output high 32 ns figures 15 and 16. t zl receiver enable to output low 32 ns figures 15 and 17. t hz receiver output high to disable 40 ns figures 15 and 18. t lz receiver output low to disable 40 ns figures 15 and 19. u nless otherwise noted : v cc = +3.3v +/-5% or +5.0v +/-5%; 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
sp336e 15 rev. 1.0.1 3.3v / 5v programmable rs-232 /rs-485/rs-422 serial transceiver 1.0 function tables the sp336e drivers and receivers may be configured to operate as either standard rs-485/rs-422 or rs-232 devices. rs-485/rs422 drivers have differential outputs and receivers have differential inputs. rs-232 drivers and receivers are single-ended with inverting outputs. t able 1: r-485/rs-422 f ull d uplex : m ode 011 (t3, r3), m ode 101 (t1, t3, r1, r3) d rivers r eceivers inputs outputs inputs output tx_en tx_in tx(a) tx(b) rx(a) - rx(b) rxout 1 1 1 0 > -50mv 1 1 0 0 1 d -200mv 0 0 x high-z open / shorted 1 t able 2: r-485/rs-422 h alf d uplex : m ode 010 (t3, r3), m ode 100 (t1, t3, r1, r3) t ransmitting r eceiving inputs outputs inputs outputs de/ re txin tx(a) tx(b) de/ re rx(a) - rx(b) rxout 1 1 1 0 1 x high-z 1 0 0 1 1 x high-z 0 x high-z high-z 0 > -50mv 1 0 d -200mv 0 0 open / shorted 1 t able 3: rs-232 m ode 001 (a ll tx and rx), m odes 011, 010 (t1, t2, r1, r2), m ode 110 (r1- r4) d rivers r eceivers input output input output 0 t 5v t 3v 0 1 d -5v d -3v 1 open d -5v open 1
f igure 4. 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 5. rs-485 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 f igure 6. 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 100 -7v to +12v v sp336e 16 3.3v / 5v programmable rs-232/rs-485/rs-422 serial transceiver rev. 1.0.1
f igure 7. rs-485 d river p ropagation d elay t est c ircuit a b tx di r l 54 c l 50pf 3.3v v od f igure 8. rs-485 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% f igure 9. 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 sp336e 17 rev. 1.0.1 3.3v / 5v programmable rs-232 /rs-485/rs-422 serial transceiver
f igure 10. rs-485 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 11. rs-485 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 f igure 12. 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 sp336e 18 3.3v / 5v programmable rs-232/rs-485/rs-422 serial transceiver rev. 1.0.1
f igure 13. rs-485 r eceiver p ropagation d elay t est c ircuit out r a b v id re c l 15pf f igure 14. rs-485 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 f igure 15. 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 sp336e 19 rev. 1.0.1 3.3v / 5v programmable rs-232 /rs-485/rs-422 serial transceiver
f igure 16. rs-485 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 17. rs-485 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 sp336e 20 3.3v / 5v programmable rs-232/rs-485/rs-422 serial transceiver rev. 1.0.1
f igure 18. 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 19. rs-485 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 20. rs-232 d river o utput s lew r ate t est c ircuit generator 50 r l out c l tx sp336e 21 rev. 1.0.1 3.3v / 5v programmable rs-232 /rs-485/rs-422 serial transceiver
f igure 21. 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 22. rs-232 r eceiver p ropagation d ela t est c ircuit generator 50 out c l rx f igure 23. 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 sp336e 22 3.3v / 5v programmable rs-232/rs-485/rs-422 serial transceiver rev. 1.0.1
sp336e 23 rev. 1.0.1 3.3v / 5v programmable rs-232 /rs-485/rs-422 serial transceiver 2.0 suggested application diagrams the sp336e supports all signals used in rs-232 over an 8 pin modular jack (rj-45) as defined in tia/eia- 561. for dte serial port only three drivers are required. driver_1 is not used in this configuration and its driver input should be tied to high or low. sp336e may also be used to implement a standard seri al port over a db-9 connector (tia/eia-574 or the standard ibm serial port). in that case either dsr or ri signal can be supported. both dsr and ri are used mainly for dial-up connections and are typically not neede d on dedicated lines. if both signals are required, add a discrete transceiver such as sp3220e. an alternative implementation would be to use the sp336e to emulate the functionality of two dual-channel rs-232 transceivers (2 x sp232?s or equivalent). loop-back changing from rs-232 mode (mode 001) to loop-b ack mode (mode 000) duplicat es the function of an external loop-back plug. loop-back can be used to te st serial port functionalit y or to diagnose faults. f igure 24. rs-232e s erial p ort (eia-561 / eia-574)
sp336e 24 3.3v / 5v programmable rs-232/rs-485/rs-422 serial transceiver rev. 1.0.1 rs-232 to rs-485 translator sp336e can be used to implement a single-chip rs-232 to rs-485 translator function. both full-duplex (4-wire rs-485) and half-duplex (2-wire rs-485) configurations are shown. rs-485 is capable of communicating on data cables up to 4000 feet (1200 meter) which makes it an ideal interface for extending the reach of short- range serial ports like rs-232. the configurations shown ca n be used to connect directly to existing pc type rs-232 serial ports to enable extended-reach communication. the rts signal (circuit ca or 105) is used as a transmit direction control signal for half-duplex. the on condition puts the repeater into transmit mode and inhibits receive. on a half-duplex channel rxd should be held in mark state (binary 1) when receiver 3 is inactive. driver 1 on the sp336e can be used to generate dsr or cts signal to indicate to the host terminal that the translator is powered-on and ready. shutdown modes sp336e features two shutdown modes. in mode 111 (full shutdown) all drivers and receivers are at high impedance. in mode 110, all drivers are tri-state but all four receivers remain active. in modes 101 and 100 two differential receivers can be kept active while the di fferential drivers are tri-stated using the tx_en inputs. f igure 25. rs-232 / rs-485 t ranslator f ul l-d uplex c able -e xtender (m ode 011)
f igure 26. rs-232 / rs-485 t ranslator h alf -d uplex c able -e xtender (m ode 010) sp336e 25 rev. 1.0.1 3.3v / 5v programmable rs-232 /rs-485/rs-422 serial transceiver
sp336e 26 3.3v / 5v programmable rs-232/rs-485/rs-422 serial transceiver rev. 1.0.1 bus repeater mode 101 can be used as a bus-repeater to extend t he reach of an rs-422 bus. this configuration is best suited for point-to-point or multi-drop communications because the drivers are always active and echoing data from their corresponding receiver. for applications where multiple nodes are allowed to tr ansmit, some type of bus arbitration should be used. one technique would be to use sp336e in conjunction with external decoder logic, packet buffers and node address fields embedded in the data stream. receiving the correct node address triggers tx_en to pass data onward. mode 100 could implement a repeater / gateway to part ition or extend rs-485 networks. direction control determines when data is forwarded to or from segments a and b. f igure 27. rs-422 b us -r epeater (m ode 101)
f igure 28. rs-485 b us -r epeater (m ode 100) sp336e 27 rev. 1.0.1 3.3v / 5v programmable rs-232 /rs-485/rs-422 serial transceiver
f igure 29. 28 p in soicw p ackage o utline d rawing sp336e 28 3.3v / 5v programmable rs-232/rs-485/rs-422 serial transceiver rev. 1.0.1
f igure 30. 28 p in tssop p ackage o utline d rawing sp336e 29 rev. 1.0.1 3.3v / 5v programmable rs-232 /rs-485/rs-422 serial transceiver
revision history d ate r evision d escription march 2010 1.0.0 production release. january 2011 1.0.1 rs-485/rs4-222 (slew = gnd, 250kbps, one transmitter s witching) driver enable / disable time maximum limit was changed from 900ns to 1500ns to better match the performance of the product. add inverting sym bol to all half-duplex receiver block dia - gram enable inputs. update pin description table. 30 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 january 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. sp336e 3.3v / 5v programmable rs-232/rs-485/rs-422 serial transceiver rev. 1.0.1

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