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exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-7000 ? fax (50)668-70 7 ? www.exar.com sp232a_00_05 308 description features sp232a enhanced rs-232 line drivers/receivers ? operates from a single +5v power supply ? meets all rs-232f and itu v.28 specifcations ? operates with 0. f ceramic capacitors ? high data rate - 20kbps under load ? low power cmos operation ? +/-2kv human body model esd protection ? lead free packaging available the sp232a is a line driver and receiver pair that meets the specifcations of rs-232 and v.28 serial protocols. this device is pin-to-pin compatible with popular industry standard pinouts. the sp232a offers 20kbps data rate under load, small ceramic type 0. f charge pump capacitors and overall ruggedness for comercial applications. the sp232a features exar's bicmos design allowing for low power operation without sacrifcing performance. this device is avaialble in plastic dip, soicw and nsoic packages operating over the commercial and industrial temperature ranges.
exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-7000 ? fax (50)668-70 7 ? www.exar.com sp232a_00_05 308 2 absolute maximum r atings these are stress ratings only and functional opera - tion of the device at these ratings or any other above those indicated in the operation sections of the speci - fcations below are not implied. exposure to absolute maximum ratings conditions for extended periods of time may affect reliability. supply voltage (v cc )...............................................+ 6v v+........................................................................... (vcc-0.3v) to + .0v v- .............................................................................- .0v input voltages tin.....................................................-0.3v to (vcc + 0.3v) rin............................................................................+/-5v output voltages tout...............................................(v+, +0.3v) to (v-, -0.3v rout...................................................-0.3v to (vcc + 0.3v) vcc=5v 0%, 0. f charge pump capacitors, t min to t max , unless otherwise noted, typical values are vcc=5v and t a =25c short circuit duration tout.....................................................continuous package power dissipation: plastic dip...............................................375mw (derate 7mw/c above +70c) small outline...........................................375mw (derate 7mw/c above +70c) storage temperature..................-65c to + 50c lead temperature (soldering, 0s).......... +300c electri cal characteristics parameter test conditions min typ max unit ttl input logic threshold low t in 0.8 volts logic threshold high tin 2.0 volts logic pull-up current tin = 0v 5 200 a ttl output output voltge low i out = 3.2 ma: v cc = +5v 0.4 volts output voltage high i out = -1.0 ma 3.5 volts rs-232 output o utput voltage swing a ll transmitter outputs loaded with 3k ohms to gnd +/-5.0 +/-6.5v volts output resistance vcc = 0v, vout = +/-2v 300 ohms output short circuit current infnite duration +/-8 ma maximum data rate cl = 2500pf, rl = 3k 20 240 kbps rs-232 input voltage range -5 +5 volts voltage threshold low vcc = 5v, t a =25c 0.8 .2 volts voltage threshold high vcc = 5v, t a =25c .7 2.4 volts hysteresis vcc = 5v, t a =25c 0.2 0.5 .0 volts resistance t a =25c, -15v v in +15v 3 5 7 k
3 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-7000 ? fax (50)668-70 7 ? www.exar.com sp232a_00_05 308 dynamic characteristics driver propagation delay ttl to rs_232; cl = 50pf .5 3.0 s receiver propagation delay rs-232 to ttl, 0. .0 s instantaneous slew rate cl = 10pf, rl = 3-7k 30 v/ s transition region slew rate cl = 2500pf, rl = 3k; measured from +3v to -3v or -3v to +3v 0 v/ s power requirements vcc power supply current no load, vcc = 5v, t a =25c .5 5 ma vcc power supply current, loaded all transmitters rl = 3k, t a =25c ma electri cal characteristics vcc=5v 0%, 0. f charge pump capacitors, t min to t max , unless otherwise noted, typical values are vcc=5v and t a =25c pin assignments pin number pin name pin function c+ positive terminal of the voltage doubler charge pump capacitor 2 v+ +6.5v generated by the charge pump 3 c- negative terminal of the voltage doubler charge pump capacitor 4 c2+ positive terminal of the inverting charge pump capacitor 5 c2- negative terminal of the inverting charge pump capacitor 6 v- -6.7v generated by the charge pump 7 t2out rs-232 driver output 8 r2in rs-232 receiver input 9 r2out ttl/cmos receiver output 0 t2in ttl/cmos driver input tin ttl/cmos driver input 2 rout ttl/cmos receiver output 3 rin rs-232 receiver input 4 tout rs-232 driver output 5 gnd ground 6 vcc 5v supply voltage
exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-7000 ? fax (50)668-70 7 ? www.exar.com sp232a_00_05 308 4 description deta iled description the sp232a transceiver is a two driver and two receiver device that meets the eia/tia- 232 and v.28 serial communication protocol. the device is pin-to-pin compatible with popular industry standard pinouts. the sp232a offers 20kbps data rate, 0v/ s slew rate and a regulated charge pump that operates from a single 5v supply. the proprietary on-board charge pump generates a regulated output of +/-6.5v for rs- 232 compliant voltage levels. theory of operation the sp232a is made up of three basic circuit blocks: . driver, 2. receiver, and 3. charge pump. drivers the drivers are inverting level transmitters that convert ttl or cmos logic levels to eia/tia- 232 levels with an inverted sense relative to the input logic levels. typically, the rs-232 output voltage swing is +/-6.5v with no load and +/- 5.0v minimum when fully loaded. the driver out - puts are protected against infnite short-circuits to ground without degradation in reliability. the drivers can guarantee output data rates of 20kbps under worst case loading of 3k ohms and 2500pf. the driver output slew rate is internally limited to 30v/ s in order to meet the eia standards (eia-232f). additionally, the driver output low to high transition meet the monotonicity output requirements of the standard. receivers the receivers convert eia/tia-232 signal levels to ttl or cmos logic output levels. since the input is usually from a transmission line, where long cable length and system interference can degrade the signal, the receiver inputs have a typical hysteresis margin of 500mv. this en - sures that the receiver is virtually immune to noisy transmission lines. should a input be left unconnected, an internal 5kohm pull-down re - sistor to ground will commit the output of the re - ceiver to a logic high state. the input voltage range for the sp232a receiver is +/- 5v. charge pump the charge pump is a patented design and uses a unique approach compared to older less effcient designs. the charge pump requires 4 external capacitors and uses a four phase volt - age shifting technique. the internal power sup - ply consists of a regulated dual charge pump that provides output voltages of +/-6.5v. this is important to maintain compliant rs-232 lev - els regardless of power supply fuctuations. the charge pump operates in a discontinous mode using an internal oscillator. if the voltages are less than a magnitude of 6.5v, the charge pump is enabled. if the output voltage exceed a magnitude of 6.5v then the charge pump is disabled. the internal oscillator controls the four phases of the voltage shifting. a description of each phase follows: phase 1 vss charge store and double: the positive ter - minals of capacitors c and c2 are charged from vcc with their negative terminals initially connected to ground. c + is then connected to ground and the stored charge from c - is superimposed onto c2-. since c2+ is still con - nected to vcc the voltage potential across c2 is now 2 x vcc. phase 2 vss transfer and invert: phase two connects the negative terminal of c2 to the vss storage capacitor and the positive terminal of c2 to ground. this transfers the doubled and inverted (v-) voltage onto c4. meanwhile, capacitor c is charged from vcc in order to prepare it for its next phase. phase 3 vdd charge store and double: phase three is identical to the frst phase. the positive termi - nals of c and c2 are charged from vcc with their negative terminals initially connected to ground. c + is then connected to ground and the stored charge from c - is superimposed onto c2-. since c2+ is still connected to vcc the voltage potential across capacitor c2 is now 2 x vcc.
5 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-7000 ? fax (50)668-70 7 ? www.exar.com sp232a_00_05 308 description phase 4 vdd transfer. the fourth phase connects the negative terminal of c2 to ground and the posi - tive terminal of c2 to the vdd storage capacitor . this transfers the doubled (v+) voltage onto c3. meanwhile, capacitor c is charged from vcc to prepare it for its next phase. under lightly loaded conditions, the intelligent pump oscillator maximizes effciency by running only as needed to maintain v+ and v- voltage levels. since interface transceivers spend most of their time at idle, this power-effcient innova - tion can greatly reduce total power consump - tion. this improvement is made possible by the independent phase sequences of the exar charge pump design. the clock rate of the charge pump typically op - erates greater than 70khz allowing the pump to operate effciently with small 0.1uf capacitors. effcient operation depends on rapid charging and discharging of c and c2. therefore, the capacitors should be mounted as close as pos - sible to the ic and have a low esr (equivalent series resistance). inexpensive, surface mount ceramic capacitors are ideal for use on charge pump. if polarized capacitors are used the posi - tive and negative terminals should be connect - ed as shown on the typical operating circuit. a diagram of the 4 individual phases is shown in figure . c 2 + - v cc c 3 c 4 c 1 + + + e - e - phases 1 and 3: store/double. double charge from c 1 onto c2. c 2 is now charged to -2xvcc + c 2 + - v cc c 3 c 4 c 1 + + + e - + e + e + c 2 + - v cc c 3 c 4 c 1 + + + phase 2 ? vss transfer from c2 to c4. meanwhile c 1 is charged to vcc e - e - e - + vss transfer from c2 to c3. meanwhile c1 is charged to vcc v dd v- v+ v- v+ v+ patented 5,306,954 phase 4 v dd figure . charge pump phases
exar corporation 48720 kato road, fremont ca, 94538 ? (5 0)668-7000 ? fax (5 0)668-70 7 ? www.exar.com sp232a_ 00_05 3 0 8 6 typ i cal perf o rma n ce character i st i cs figure 2, charge pump waveforms with no load ( = c +, 2 = c2+, 3 = v+, 4 = v-). figure 3, charge pump waveforms when fully loaded with 3k ohms ( = c +, 2 = c2+, 3 = v+, 4 = v-). figure 4, loopback results at 60khz and 2500pf load ( = txin, 2 = txout/rxin, 3 = rxout). figure 5, charge pump outputs at start up ( = vcc, 2 = v+, 3 = v-). figure 6, typical application circuit
7 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-7000 ? fax (50)668-70 7 ? www.exar.com sp232a_00_05 308
exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-7000 ? fax (50)668-70 7 ? www.exar.com sp232a_00_05 308 8
9 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-7000 ? fax (50)668-70 7 ? www.exar.com sp232a_00_05 308
exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-7000 ? fax (50)668-70 7 ? www.exar.com sp232a_00_05 308 0 notice exar corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliabil - ity. 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 ef fectiveness. products are not authorized for use in such applications unless exar corporation receives, in writting, 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 2008 exar corporation datasheet may 2008 send your interface technical inquiry with technical details to: customersupport@exar.com reproduction, in part or whole, without the prior written consent of exar corporation is prohibited. ordering information part number lead free tape & reel temperature range package type sp232acn -l /tr from 0 to +70 0 c 6 pin nsoic sp232act -l /tr from 0 to +70 0 c 16 pin wsoic sp232acp -l /tr from 0 to +70 0 c 6 pin pdip sp232aen -l /tr from -40 to +85 0 c 6 pin nsoic sp232aet -l /tr from -40 to +85 0 c 16 pin wsoic sp232aep -l /tr from -40 to +85 0 c 6 pin pdip all packages are available as lead free (rohs compliant). to order add -l suffx to part number. for tape and reel add /tr. reel quantity is 2,500 for nsoic. example: sp232acn-l/tr = lead free and tape and reel. sp232acn/tr = standard with tape and reel.
mouser electronics authorized distributor click to view pricing, inventory, delivery & lifecycle information: exar: ? sp232aet-l? sp232acn-l? sp232acp-l? SP232AEN-L? sp232act-l? sp232aep-l? sp232acn-l/tr? sp232aen- l/tr? sp232aet-l/tr? sp232act-l/tr

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