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F81438 jan, 2012 v0.11p F81438 single 5v rs232/rs422/rs485 multiprotocol transceiver release date: jan, 2012 version: v0.11p
F81438 jan, 2012 v0.11p F81438 datasheet revision history version date page revision history v0.10p 2011/11 - preliminary v0.11p 2012/01 - made clarification and correction delete 28-sop package update pin 21 & 22 description please note that all data and specificat ions are subject to change without not ice. all the trade marks of products and companies mentioned in this data sheet belong to their respective owners. life support applications these products are not designed for us e in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. cust omers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify fintek for any damages resulting from such improper use or sales.
F81438 jan, 2012 v0.11p table of content 1 general de scripti on ........................................................................................................... ...................................... 4 2 feature list ............................................................................................................................... ............................... 4 3 pin confi gurati on ............................................................................................................. ........................................ 5 4 pin descr iption ............................................................................................................... ......................................... 5 5 function de scription .......................................................................................................... ...................................... 7 5.1 mode sele ction ................................................................................................................ ............................. 7 5.2 mode descr iption .............................................................................................................. ............................ 8 5.2.1 pure rs-232 (mode 01) ......................................................................................................... ................... 8 5.2.2 rs-485 driver half duplex (m ode 10) ........................................................................................... ........... 9 5.2.3 rs-485 receiver full duplex (m ode 11) ......................................................................................... ......... 9 5.2.4 pure rs-422 full d uplex (m ode 00) ............................................................................................. .......... 10 6 electrical charac teristics request ............................................................................................ ............................ 11 7 ordering info rmati on .......................................................................................................... ................................... 18 8 top marking s pecificat ion ..................................................................................................... ................................ 18 9 package s pec. ................................................................................................................. ..................................... 19 10 application circui t ........................................................................................................... ....................................... 20
F81438 jan, 2012 v0.11p 4 1 general description the F81438 is programmable, monolithic multi-protocol transceiver device that contains rs-232 and rs-485 / rs-422 drivers and receivers. the F81438 can be reconfigured into four operating modes including rs-232 only (3tx/5rx), one rs-485 (1tx/1rx) driver (tx) half duplex mode, one rs-485 (1tx/1rx) receiver (rx) half duplex mode , and rs-422 (1tx/1rx) fu ll duplex mode which can be selected whenever you need by changing the logic state of the 2 mode selection pins. the device can implement a dual-mode serial port, mixed mode ports or as an interface signal translator. the extra charge pumps deliver true rs-232 driver output voltage from a single power supply at 5v. a slew rate control pin configures driver outputs for either high data rate or slew-controlled data rates. slew-controlled outputs minimize the problems that caused by the 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 receivers have advanced failsafe protection to prevent oscillati on when inputs are un - connected. in rs-232 mode each receiver input has a 5k ? pull-down to ground. 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 (iec 61000-4-2 air gap). 2 feature list ? 5v single supply operation ? robust 15kv esd protection (iec 61000-4-2 air gap) ? mixed rs-232 / rs-485 modes ? adjustable slew rate for minimize emi error ? rs-485 advance failsafe on open, short or terminated lines ? 28 pin tssop packaging ? flexible 4 operation modes selected by 2 configuration pins ? one set of 3t5r rs-232 v.28 drivers & receivers ? one set of rs-485 drivers (half duplex configuration) ? one set of rs-485 receivers (half duplex configuration) ? one set of rs-422 driver & receiver (full duplex configuration)
F81438 jan, 2012 v0.11p 5 3 pin configuration 4 pin description in t in t,pu 8ua ain aout o 4 - ttl level input pin. - ttl level input pin, pull up 8ua. - input pin (receiver). - output pin (buffer driver). - output pin with 4ma driver. p - power. 4.1. power pin pin pin name type description 5 vcc p 5v power supply voltage input 8 gnd p gnd.
F81438 jan, 2012 v0.11p 6 4.2. transceiver pin pin name type description single ended full-duplex half-duplex 1 t1_in in t t1 driver input t driver enable active high t driver enable active high, r enable active low 3 r5_in ain/aout r5 receiver input t(b) driver output r(b) receiver intput, t (b) output 4 r4_in ain /aout r4 receiver input t(a) driver output t(a) driver output, r(a) receiver input 6 r1_in ain r1 receiver input high impedance high impedance 7 t1_out aout t1 driver output high impedance high impedance 15 r2_in ain r2 receiver input high impedance high impedance 16 r3_in ain r3 receiver input high impedance high impedance 17 t2_out ain t2 driver output r(a) receiver input high impedance 18 t3_out ain t3 driver output r(b) receiver input high impedance 19 r2_out o 4 r2 reveiver output high 20 r3_out o 4 r3 receiver output high 21 r4_out o 4 r4 receiver output r receiver output r receiver output high 22 r5_out o 4 r5 receiver output high impedance r receiver output high 26 r1_out o 4 r1 receiver output high 27 t3_in in t t3 driver input high impedance high impedance 28 t2_in in t t2 driver input t driver input t driver input 4.3. charge pump, mode select & other functions pin pin name type description 9 c1+ pump positive terminal of the 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 positive flying capacitor 14 v- pump vss storage capacitor 2 mode_1 in t mode selection pin-1 23 mode_2 in t mode selection pin-2 24 sd in t shutdown pin. 25 slew in t,pu 8ua slew rate control pin, logica l low input will limit driver slew from either rs-232 to 1mbps or rs-485 to 10mbps
F81438 jan, 2012 v0.11p 7 5 function description 5.1 mode selection the F81438 drivers and receivers can be configured to operate either as the standard rs-232 or rs-485 / rs-422 devices. it can be reconfigured into four operating modes, and be selected by 2 configuration pins. the table below shows how to use the configuration pins to select the function you want. table 1: mode select configuration pin 2 mode_1 pin 23 mode_2 mode status 0 1 pure rs-232 3t/ 5r rs-232. 1 0 rs-485 receiver half duplex 1t/1r rs-485 1 1 rs-485 driver half duplex 1t/1r rs-485 0 0 pure rs-422 full duplex 1t/1r rs422 mode the rs-485 / rs-422 drivers have the differential outputs and receivers have the differential inputs. rs-232 drivers and receivers are single-ended with the inverting outputs. the following table shows the characteristic of F81438 in rs-485 / rs-422 full & half duplex mode. table 2: rs-232: mode 01 drivers r eceivers input output input output 0 5v 3v 0 1 -5v -3v 1 open -5v open 1 table 3: rs-485 driver & receiver half duplex: mode 10, mode 11 t ransmitting r eceiving inputs outputs inputs outputs de/re txin tx(a) tx(b) de/re rx(a) - rx(b) rxout 1 1 0 1 1 x high-z 1 0 1 0 1 x high-z 0 x high-z high-z 0 > -50mv 1 0 <-200mv 0 0 open / shorted 1
F81438 jan, 2012 v0.11p 8 table 4: rs-422 full duplex: mode 00 drivers receivers inputs outputs inputs outputs tx_en tx_in tx(a) tx(b) rx(a) - rx(b) rxout 1 1 0 1 > -50mv 1 1 0 1 0 < -200mv 0 0 x high-z open / shorted 1 5.2 mode description 5.2.1 pure rs-232 (mode 01) the F81438 supports all signals used in rs-232 over an 8 pin rj-45 as defined in tia/eia-561. for dte serial port only three drivers are required. F81438 may also be used to implement a standard serial 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 needed on dedicated lines. if both signals are required, add a discrete transceiver such as F81438. figure 1: pure rs-232 mode 26 6 1 7 28 17 27 18 19 15 20 16 21 4 22 3 mode 01
F81438 jan, 2012 v0.11p 9 5.2.2 rs-485 driver half duplex (mode 10) t he F81438 provides 1 set of rs-485 driver half duplex 1t/1r. figure 2: rs-485 driv er half duplex mode 5.2.3 rs-485 receiver full duplex (mode 11) the F81438 provides 1 set of rs-485 receiver half duplex 1t/1r. figure 3: rs-485 receiver half duplex mode 20 16 22 18 28 1 21 4 3 mode 10 26 6 27 7 19 15 mode 11 20 16 22 18 28 1 21 4 3 26 6 27 7 19 15
F81438 jan, 2012 v0.11p 10 5.2.4 pure rs-422 full duplex (mode 00) t he F81438 provides 1 set of rs-422 full duplex 1t/1r. figure 4: pure rs-422 full duplex mode mode 00 28 1 4 3 17 18 21 26 6 27 7 19 15 20 16
F81438 jan, 2012 v0.11p 11 6 electrical characteristics request 6.1 absolute maximum ratings parameter rating unit power supply voltage +6.0 v receiver input voltage (dc input voltage) -13.2 to +13.2 v input voltage at ttl input pins -0.3 to vcc +0.5 v driver output voltage (from ground) -7.5 to +12.5 v short cirecuit duration, txout to gnd continous - storage tempreature -65 to +150 c lead temperature (soldering, 10s) +300 c note: exposure to conditions beyond those listed under absolute maximum ratings may adversely affect the life and reliability of the device 6.2 dc characteristics ( t a = 0 c to 70 c, vdd = +5.0v 5% ) parameter conditions min typ max unit supply current (rs-232) no load, mode = 01. 2 30 ma supply current (rs-485) no load, mode = 10, 11. 2 ma supply current (rs-422) mode = 00. 2 ma (t a = 0 c to 70 c, vdd = +5.0v 5%) parameter sym. min. typ. max. unit conditions transmitter and logic input pins (mode, slew) 1, 2, 23, 24, 25, 27, 28 logic input voltage high v il 2.4 v vdd = 5.0 v logic input voltage low - 0.8 v logic input pull-up current - 15 a tx_in pull high current i it 15 a logic input hysteresis - 0.5 v rs-232 and rs-485 / 422 receiver outputs rx_out: pin 19, 20, 21, 22, 26 receiver output voltage high v oh vcc- 0.6 v iout = -1.5ma. receiver output voltage low v ol 0.4 v iout = 2.5ma. receiver output short-circuit current i os 20 60 ma 0 < vo < vcc. receiver output leakage current - 0.05 1 a receivers disabled. rs-232 single-end receiver input (rx_in, pin 3, 4, 6, 15, 16) input voltage range - -13.2 +13.2 v input threshold low v il 0.8 1.5 v vcc = 5.0v. input threshold high v ih 1.8 2.4 v vcc = 5.0v. input hysteresis - 0.5 v input resistance - 3 5 7 k ? rs-485 / rs-422 differential receiver inputs (rx_in, pin 3, 4) receiver differential threshold voltage - -250 -200 mv v b = 0v. receiver input hysteresis - 30 mv v cm = 0v.
F81438 jan, 2012 v0.11p 12 input current - 200 300 a de = 0v, vin = 12v, full-duplex. input current - -200 -300 a de = 0v, vin = - 7v, full-duplex. input resistance 30 k ? -7v vcm +12v rs232 single-ended/rs422/485 driver outputs (tx_out, rs-232, pin 7, 17, 18) output voltage swing - 5.0 5.4 v rload = 3k ? to gnd. - 6.0 v no load output. output short circuit current - 60 ma vo = 0v. power off impedance - 300 10m ? vcc = 0v; vo = 2v. rs-485 / rs-422 differential driver outputs (tx_out) differential driver output - 2 vcc v rload = 100 ? (rs422) - 1.5 vcc v rload = 54 ? (rs485) - 1.5 vcc v vcm = -7v - 1.5 vcc v vcm = +12v change in magnitude of differential output voltage - -0.2 +0.2 v rload = 47 ? driver common mode output volt- age - 3 v rload = 47 ? change in magnitude of common mode output voltage - 0.2 v rload = 47 ? driver output short circuit current - 250 ma v = +12v to -7v output leakage current - 200 300 ua de = 0v or shutdown, vo = +12v to -7v. t di vcc vod voc rl/2 rl/2
F81438 jan, 2012 v0.11p 13 6.3 ac characteristics (t a = 0 c to 70 c, vdd = +5.0v 5%) parameter sym. min typ max unit conditions rs-232 (slew = gnd, 250kbps, one transmitter switching) maximum data rate 250 kbps rl=3k, cl=1000p receiver propagation delay t phl , t plh 100 ns cl=150pf receiver skew |t phl - t plh | 50 ns cl=150pf driver skew |t thl ? t tlh | 100 ns transition-region slew rate 3.0v 6 30 v/ s vcc=3v, rl=3~7k, cl=150~1000pf rs-232 (slew = vcc, 1mbps, one transmitter switching) maximum data rate - 1 mbps rl = 3k, cl = 250pf. receiver propagation delay t phl , t plh 100 ns cl = 150pf. receiver skew |t phl - t plh | 50 ns cl = 150pf. driver skew |t thl ? t tlh | 25 ns transition-region slew rate 3.0v 90 v/ s vcc = 5v, rl = 3~7k , ? cl = 150~1000pf.
F81438 jan, 2012 v0.11p 14 propagation delay driver slew rate rs-485/rs-422 (slew = gnd, 250kbps, one transmitter switching) maximum data rate 250 kbps r diff =47 ? , cl=47p. differential output propagation delay time t dphl , t dplh 250 1500 ns driver rise and fall time t r , t f 200 1500 ns driver propagation delay skew t skew 200 ns
F81438 jan, 2012 v0.11p 15 propagation delay parameter sym. min typ max unit conditions driver output enable time 300 ns driver output disable time 300 ns
F81438 jan, 2012 v0.11p 16 parameter sym. min typ max unit conditions receiver propagation delay t dphl , t dplh 150 ns parameter sym. min typ max unit conditions receiver enable to output high t zh 50 ns receiver enable to output low t zl 50 ns receiver output high to disable t hz 50 ns receiver output low to disable t lz 50 ns
F81438 jan, 2012 v0.11p 17 rs-485/rs-422 (slew = vcc, 10mbps, one transmitter switching) maximum data rate 10 mbps r diff =47 ? , cl=47pf. differential output propagation delay time t dphl , t dplh 60 120 ns driver rise and fall time t r , t f 10 25 ns driver propagation delay skew t skew 10 ns driver output enable time 300 ns driver output disable time 300 ns receiver propagation delay t dphl , t dplh 150 ns receiver enable to output high t zh 32 ns receiver enable to output low t zl 32 ns receiver output high to disable t hz 40 ns receiver output low to disable t lz 40 ns
F81438 jan, 2012 v0.11p 18 7 ordering information 8 top marking specification the version identification is shown as the bold re d characters. please refer to below for detail: part number package type production flow F81438g 28-tssop green package commercial, 0 c to +70 c 2 n d line: assembly plant code (x) + assembled year code (x) + week code (xx) + fintek internal code (xx) + ic version (x) where a means version a, b means version b, ? : pin 1 identifier 1 s t line: fintek logo 2 n d line: device name ? F81438g, where g means 28-tssop 3 r d line: wafer fab code (xxxx?xx) F81438g xxxxxx x xxxxxx.xx
F81438 jan, 2012 v0.11p 19 9 package spec. 28-tssop package
F81438 jan, 2012 v0.11p 20 10 application circuit ri ri slew slew r5_i n mod e_1 slew mod e_2 sd 8 t2_out 24 F81438 2 23 26 9 tit le size document number rev date: sheet of F81438 a b 11 monday , nov ember 07, 2011 r1_out sin# dtr# dsr# gnd cts# dcd# 5 9 4 8 3 7 2 6 1 rts# ri# sout# 10 sin rts dsr cts ri sout dtr dcd sd mod e_2 mod e_1 r4_i n sout# ri# cts# dtr# sin# dsr# dcd# rts# 19 t1_out r2_out t3_out c 1.0uf sd r2_i n 11 mod e_ 1 r3_i n 12 mod e_ 2 r1_i n 13 slew 3 14 17 25 4 7 5 18 15 16 t1_i n 6 1 t2_i n cts sin dcd 28 dtr sout gnd gnd db9 host 5v r3_out 20 t3_i n 27 r4_out 21 vcc r5_out 22 c 0.1uf c 0.1uf c 0.1uf c 0.1uf cts rts dsr gnd dtr sout sin dcd sd mod e_1 mod e_2 dsr rts vcc c2+ v+ c1+ c1- c2- v- gnd sd m ode _1 m ode _2 m ode mode selection 0 0 1 rs232 0 0 0 rs422 1 x x shutdow n m ode 0 1 1 rs485 (default tx) 0 1 0 rs485 (default rx)

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