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exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp33_00_0260 the sp33 is a programmable rs-232 and/or rs-485 transceiver ic. the sp33 contains four drivers and four receivers when selected in rs-232 mode; and two drivers and two receivers when selected in rs-485 mode. the sp33 also contains a dual mode which has two rs-232 drivers/receivers plus one differential rs-485 driver/receiver. the rs-232 transceivers can typically operate at 230kbps while adhering to the rs-232 speci - fcations. the rs-485 transceivers can operate up to 10mbps while adhering to the rs-485 specifcations. the SP331 includes a self-test loopback mode where the driver outputs are internally confgured to the receiver inputs. this allows for easy diagnostic serial port testing without using an external loopback plug. the rs-232 and rs-485 drivers can be disabled (high-z output) by controlling a set of four select pins. description ? +5v only operation ? software programmable rs-232 or rs-485 selection ? four rs-232 transceivers in rs-232 mode ? two rs-485 full-duplex transceivers in rs-485 mode ? two rs-232 transceivers and one rs-485 transceiver in dual mode ? self-testing loopback mode ? full driver tri-state (hi-z) control ? ideal for rs-232 to rs-485 conversion sp33 programmable dual rs-232/rs-485 transceiver ti4 sel_b tx4 tx3 vcc tx1 tx2 gnd c1+ v+ (vdd) c2+ c1? c2? v? (vss) ti3 ti2 ti1 sel_c sel_a sel_d rx4 rx3 rx2 rx1 ri4 ri3 ri2 ri1 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 SP331 typical applications circuit sel a ttl/cmos ttl/cmos ttl/cmos 0.1f c1 + c1- c2 + c2- 1 sel b 2 +5v vcc 5 gnd 8 9 11 12 13 19 20 22 24 26 27 28 ttl/cmos ttl/cmos ttl/cmos ttl/cmos t1 t3 r1 rs-48 5 rs-48 5 rs-48 5 0v v+ v- 0v sel c rs-48 5 rs-48 5 rs-48 5 4 6 7 10 14 15 16 23 25 3 ri 1 ri 2 tx 3 tx 4 tx 1 tx 2 ti1 ti2 ti3 ti4 rx1 rx2 ttl/cmos 21 r3 17 18 ri 4 ri 3 rx3 rx4 15k 400k vc c 400k vc c sel d rs-48 5 rs-48 5 +5v +5v SP331 15k 15k 15k 0.1f 0.1f 0.1f
2 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp33_00_0260 specifications parameter min. typ. max. units conditions logic inputs v il 0.8 volts v ih 2.0 volts logic outputs v ol 0.4 volts i out = -3.2ma v oh 2.4 volts i out = .0ma rs-232 driver dc characteristics high level output +5.0 +5.0 volts r l = 3k?, v in = 0.8v low level output -5.0 -5.0 volts r l = 3k?, v in = 2.0v open circuit voltage -5 +5 volts short circuit current +/-00 ma v out = 0v power off impedance 300 ? v cc = 0v, v out = +/-2.0v ac characteristics slew rate 30 v/s r l = 3k?, c l = 50pf; v cc = +5.0v, t a @ 25c transistion time .5 s r l = 3k?, c l = 2500pf; between +/-3v, t a @ +25c maximum data rate 20 235 kbps r l = 3k?, c l = 2500pf propagation delay t phl 2 8 s measured from 1.5v of v in to 50% of v out ; r l = 3k? propagation delay t plh 2 8 s rs-232 receiver dc characteristics high threshold .7 3.0 volts low threshold 0.8 .2 volts receiver open circuit bias +2.0 volts input impedance 3 5 7 k? v in = +5v to -5v absolute maximum ratin gs 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. v cc .......................................................................+7v input voltages logic............................-0.5v to (vcc+0.5v) drivers.........................-0.5v to (vcc+0.5v) receivers......................+/-30v @ 100ma driver outputs..................................................+/-5v maximum data rate..........................8mbps (note 1) storage temperature.......................-65?c to +150?c power dissipation 28-pin wsoic...................................000mw package derating: 28-pin wsoic ? ja ................................................40 c/w limits are specifed at t a = 25c and v cc = +5.0v unless otherwise noted.
3 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp33_00_0260 specifications parameter min. typ. max. units conditions rs-232 receiver (continued) ac characteristics maximum data rate 20 235 kbps propagation delay t phl 0.25 s measured from 50% of v in to .5v of v out propagation delay t plh 0.25 s rs-485 driver dc characteristics open circuit voltage 6.0 volts differential output .5 5.0 volts r l = 54?, c l = 50pf balance +/-0.2 volts |v t | - |v t | common-mode output 3.0 volts output current 28.0 ma r l = 54? short circuit current +/-250 ma terminated in -7v to + 0v ac characteristics maximum data rate 0 mbps r l = 54? maximum data rate 8 mbps t a = +85c, note output transition time 30 50 ns rise/fall time, 0%-90% propagation delay t phl 80 20 ns see figures 2 & 4, r diff = 54?, c l = c l2 = 00pf propagation delay t plh 80 20 ns driver output skew 0 20 ns per figure 4, t skew = |t phl - t plh | rs-485 receiver dc characteristics common mode range -7.0 +2 volts receiver sensitivity +/-0.2 +/-0.3 volts -7v v cm +12v input impedance 2 5 k? -7v v cm +12v ac characteristics maximum data rate 0 mbps maximum data rate 8 mbps t a = +85c, note propagation delay t phl 30 200 ns see figures 2 & 6, r diff = 54?, c l = c l2 = 00pf propagation delay t plh 30 200 ns differential receiver skew 0 20 ns t skew = |t phl - t plh |, r diff = 54?, c l = c l2 = 00pf enable timing rs-485 driver enable time (see figures 3 and 5) enable to low 90 50 ns c l = 5pf, s closed enable to high 90 50 ns c l = 5pf, s 2 closed disable time (see figures 3 and 5) disable from low 80 20 ns c l = 5pf, s closed disable from high 80 20 ns c l = 5pf, s 2 closed limits are specifed at t a = 25c and v cc = +5.0v unless otherwise noted.
4 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp33_00_0260 specifications parameter min. typ. max. units conditions power requirements supply voltage v cc +4.75 +5.25 volts supply current i cc no load (t x disabled) 0 5 ma sel_a ? sel_d = "0001" no load (rs-232 mode) 5 30 ma sel_a ? sel_d = "0000" no load (rs-485 mode) 7 20 ma sel_a ? sel_d = "1100" environmental operating temperature commercial (_c_) 0 70 oc industrial (_e_) -40 +85 oc storage temperature -65 +50 oc receiver input graph rs-485 receiver +1.0ma -0.6ma +6v +12v -3v -7v maximum input current versus voltage 1 unit load test circuits a b r r v od v oc figure . driver dc test load circuit c l1 15pf ro a b a b di c l2 r l figure 2. driver/receiver timing test circuit 500? c l output under test s 1 s 2 v cc figure 3. driver timing test load #2 circuit limits are specifed at t a = 25c and v cc = +5.0v unless otherwise noted. note 1: exceeding the maximum data rate of 8mbps at t a = 85c may permanently damage the device
5 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp33_00_0260 figure 4. driver propagation delays figure 5. driver enable and disable times figure 6. receiver propagation delays +3v 0v driver input a b driver output v o + differential output v a ? v b 0v v o ? 1.5v 1.5v t plh t f t r f 1mhz; t r 10ns ; t f 10ns v o 1/2v o 1/2v o t phl t skew = |t dplh - t dphl | t dplh t dphl +3v 0v de 5v v ol a , b 0v 1.5v 1.5v t zl t zh f = 1mhz; t r < 10ns ; t f < 10ns v oh a , b 2.3v 2.3v t lz t hz 0.5v 0.5v output nor mally low output nor mally high v oh v ol receiver out 1.5v 1.5v t phl f = 1mhz; t r 10ns ; t f 10ns output v od2 + v od2 ? a ? b 0v 0v t plh input switching waveforms
6 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp33_00_0260 figure 7. typical rs-232 driver output figure 8. typical rs-485 driver output tt l inpu t driver outpu t ttl input driver output a driver output b differential output v a - v b figure 9. sp33 pinout ti4 sel_b tx4 tx3 vcc tx1 tx2 gnd c1+ v+ (vdd) c2+ c1? c2? v? (vss) ti3 ti2 ti1 sel_c sel_a sel_d rx4 rx3 rx2 rx1 ri4 ri3 ri2 ri1 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 SP331
7 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp33_00_0260 sel a ttl/cmo s ttl/cmo s ttl/cmo s c1+ c1- c2+ c2- 1 sel b 2 +5 v vc c 5 gn d 8 9 11 12 13 19 20 22 24 26 27 28 ttl/cmo s ttl/cmo s ttl/cmo s ttl/cmo s t1 t3 r1 rs-48 5 rs-48 5 rs-485 0v v+ v- 0v sel c rs-485 rs-48 5 rs-48 5 4 6 7 10 14 15 16 23 25 3 ri 1 ri 2 tx 3 tx 4 tx 1 tx 2 ti 1 ti 2 ti 3 ti 4 rx 1 rx 2 ttl/cmo s 21 r3 17 18 ri 4 ri 3 rx 3 rx 4 15k 400k vcc 400k vcc sel d rs-485 rs-48 5 +5 v +5 v +5 v gnd ttl/cmos ttl/cmos ttl/cmos ttl/cmos 0v 0.1f vcc v+ v- 0v sel c rs-23 2 ttl/cmos ttl/cmos ttl/cmos ttl/cmos t1 t2 t3 t4 tx 1 tx 2 tx 3 tx 4 ti1 ti2 ti3 ti4 ri1 ri2 ri3 ri4 rx1 rx2 rx3 rx4 1 3 4 5 6 7 8 10 c1 + c1- c2+ c2- 9 11 12 13 14 15 16 17 18 19 20 21 22 23 sel b 2 sel a 24 25 26 27 28 r1 r2 r3 r4 5k 400k vcc vcc vcc vcc rs-23 2 rs-23 2 rs-23 2 rs-23 2 rs-23 2 rs-23 2 rs-23 2 sel d 0v 0v SP331 SP331 0.1f 0.1f 0.1f 400k 400k 400k 5k 5k 5k 0.1f 0.1f 0.1f 0.1f 15k 15k 15k figure 0. typical operating circuit
8 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp33_00_0260 function t able for select pins a b c d mode function 0 0 0 0 rs-232 all four rs-232 drivers active 0 0 0 rs-232 all four rs-232 drivers tri-state 0 0 0 rs-232 all four rs-232 drivers tri-state 0 0 rs-232 rs-232 (4ch) loopback 0 0 0 rs-232/rs-485 t and t2 active rs-232; t3 tri-state rs-485 0 0 rs-232/rs-485 t and t2 tri-state rs-232; t3 active rs-485 0 0 rs-232/rs-485 t and t2 active rs-232; t3 tri-state rs-485 0 rs-232/rs-485 rs-232 (2ch) / rs-485 ( ch) loopback 0 0 0 rs-485/rs-232 t active rs-485; t3 and t4 active rs-232 0 0 rs-485/rs-232 t tr-state rs-485; t3 active rs-232; t4 active rs232 0 0 rs-485/rs-232 all rs-485 and rs-232 drivers tri-state 0 rs-485/rs-232 rs-485 ( ch) / rs-232 (2ch) loopback 0 0 rs-485 t and t3 active rs-485 0 rs-485 t tri-state rs-485; t3 active rs-485 0 rs-485 t active rs-485; t3 tri-state rs-485 rs-485 rs-485 (2ch) loopback table 1. mode function table. (refer to control logic confrmations for block diagrams) t heory of o peration the SP331 is made up of four separate circuit blocks the charge pump, drivers, receivers, and decoder. each of these circuit blocks is described in more detail below. chargeCpump the charge pump is a exar Cpatented design (u.s. 5,306,954) and uses a unique approach compared to older less effcient designs. the charge pump still requires four external capacitors, but uses a fourCphase voltage shifting technique to attain symmetrical 0v power supplies. figure 5(a) shows the waveform found on the positive side of capci - tor c2, and figure 5(b) shows the negative side of capcitor c2. 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 capaci - tors c and c 2 are initially charged to +5v. c l + is then switched to ground and charge transferred to c 2 C . since c 2 + is connected to +5v, the voltage potential across capacitor c 2 is now 0v. phase 2 v ss transfer phase two of the clock con - nects the negative terminal of c 2 to the v ss storage capacitor and the positive terminal of c 2 to ground, and transfers the generated Cl0v to c 3 . simultaneously, the positive side of capacitor c is switched to +5v and the negative 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 c produces C5v in the negative terminal of c , which is applied to the negative side of capacitor c 2 . since c 2 + is at +5v, the voltage potential across c 2 is l0v. phase 4 v dd transfer the fourth phase of the clock connects the negative terminal of c 2
9 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp33_00_0260 to ground and transfers the generated l0v across c 2 to c 4 , the v dd storage capacitor. again, simultaneously with this, the positive side of capacitor c is switched to +5v and the negative side is connected to ground, and the cycle begins again. since both v+ and v C are separately gen - erated from v cc in a noCload condition, v+ and v C will be symmetrical. older charge pump approaches that generate v C from v+ will show a decrease in the magnitude of v C compared to v+ due to the inherent ineffciencies in the design. the clock rate for the charge pump typically operates at 5khz. the external capaci - tors must be 0. f with a 6v breakdown rating. external power supplies for applications that do not require +5v only, external supplies can be applied at the v+ and v C pins. the value of the external sup - ply voltages must be no greater than l0v. the current drain for the 0v supplies is used for rs-232. for the rs-232 driver the current requirement will be 3.5ma per driver. the external power supplies should provide a power supply sequence of :+l0v, then +5v, followed by Cl0v. v cc = +5v ?5v ?5v +5v v ss storage capacitor v dd storage capacitor c 1 c 2 c 3 c 4 + + + + ? ? ? ? v cc = +5v ?10v v ss storage capacitor v dd storage capacitor c 1 c 2 c 3 c 4 + + + + ? ? ? ? v cc = +5v ?5v +5v ?5v v ss storage capacitor v dd storage capacitor c 1 c 2 c 3 c 4 + + + + ? ? ? ? v cc = +5v +10v v ss storage capacitor v dd storage capacitor c 1 c 2 c 3 c 4 + + + + ? ? ? ? figure . charge pump phase . figure 2. charge pump phase 2. figure 3. charge pump phase 3. figure 4. charge pump phase 4. +10v gnd gnd -10v a) c2+ b) c2- figure 5. charge pump waveforms
0 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp33_00_0260 drivers the SP331 has four independent rs-232 single-ended drivers and two differential rs-485 drivers. control for the mode selec - tion is done via a fourCbit control word. the drivers are pre-arranged such that for each mode of operation the relative position and functionality of the drivers are set up to ac - commodate the selected interface mode. as the mode of the drivers is changed, the elec - trical characteristics will change to support the requirements of clock, data, and control line signal levels. unused driver inputs can be left foating; however, to ensure a desired state with no input signal, pullCup resistors to +5v or pullCdown resistors to ground are suggested. since the driver inputs are both ttl or cmos compatible, any value resistor less than 100k? will suffce. when in rs-232 mode, the single-ended rs-232 drivers produce compliant rs-232e and itu v.28 signals. each of the four driv - ers output single-ended bipolar signals in access of 5v with a full load of 3k? and 2500pf applied as specifed. these drivers can also operate at least 20kbps. when programmed to rs-485 mode, the differential rs-485 drivers produce complaint rs-485 signals. each rs-485 driver outputs a unipolar signal on each output pin with a magnitude of at least .5v while loaded with a worst case of 54? between the driver's two output pins. the signal levels and drive capability of the rs-485 drivers allow the drivers to also comply with rs-422 levels. the transmission rate for the differential drivers is 10mbps. receivers the SP331 has four single-ended receivers when programmed for rs-232 mode and two differential receivers when programmed for rs-485 mode. control for the mode selection is done via a 4Cbit control word, as in the drivers. as the operating mode of the receivers is changed, the electrical characteristics will change to support the requirements of the appropriate serial standard. unused receiver inputs can be left foating without causing oscillation. to ensure a desired state of the receiver output, a pullCup resistor of 100k? to +5v should be connected to the inverting input for a logic low, or the nonCinverting input for a logic high. for single-ended receiv - ers, a pullCdown resistor to ground of 5k? is internally connected, which will ensure a logic high output. the rs-232 receiver has a singleCended input with a threshold of 0.8v to 2.4v. the rs-232 receiver has an operating voltage range of 5v and can receive signals up to 20kbps. rs-232 receivers are used in rs-232 mode for all signal types include data, clock, and control lines of the rs-232 serial port. the differential rs-485 receiver has an input impedance of 15k? and a differential thresh - old of 200mv. since the characteristics of an rs-422 receiver are actually subsets of rs-485, the receivers for rs-422 require - ments are identical to the rs-485 receivers. all of the differential receivers can receive data up to 10mbps. select mode pins similar to our sp500 family of multiprotocol products, the SP331 has the ability to change the confguration of the drivers and receiv - ers via a 4Cbit switch. referring to table ; rs-232 mode, rs-485 mode, or two differ - ent combinations of rs-232/rs-485 can be confgured using the sel_a and sel_b pins. the drivers can be put into tri-state mode by using the sel_c and sel_d pins. all receivers remain active during any tri-state condition of the drivers. loopback mode loopback is invoked by asserting "xx11" into the select pins. in rs-232/rs-485 or rs-485/rs-232 loopback mode, the rs-232 driver outputs loop back into the rs-232 receiver inputs and the rs-485 differential driver loops back into the rs-485 receiver. during loopback, the driver outputs and receiver inputs are disconnected from the outside world. the driver outputs are in tri- state and the receiver inputs are disabled. the input impedance of the receivers during loopback is approximately 15k? to ground.
exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp33_00_0260 sel a 0 0 0 0 0 0 sel b 0 0 0 0 0 0 sel c 0 0 0 0 0 0 0 0 sel d 0 0 0 0 0 0 0 0 SP331 control lo gic config uration (refer to table 1) SP331 loopback (refer to table 1) 28 t3 3 6 7 4 tx 4 tx 3 tx 1 tx 2 ti3 19 r1 16 15 ri 1 ri 2 rx1 t1 26 ti1 21 r3 18 17 ri 3 ri 4 rx3 28 t3 3 6 7 4 tx 4 tx 3 tx 1 tx 2 ti3 19 r1 16 15 ri 1 ri 2 rx 1 t1 r3 rx 3 21 26 ti1 17 ri 3 t4 ti4 1 r4 rx 4 22 18 ri 4 26 t1 7 4 3 6 tx 2 tx 1 tx 3 tx 4 ti1 21 r3 18 17 ri 3 ri 4 rx3 t3 r1 rx1 19 28 ti3 15 ri 1 t2 ti2 27 r2 rx2 20 16 ri 2 26 t1 7 6 tx 2 tx 1 ti1 r1 rx 1 19 15 ri 1 t2 ti2 27 r2 rx 2 20 16 ri 2 4 tx 3 t3 ti3 28 3 tx 4 t4 ti4 1 r3 rx 3 21 17 ri 3 r4 rx 4 22 18 ri 4 sel a 0 0 sel b 0 0 sel c sel d 26 t1 7 6 tx 2 tx 1 ti1 r1 rx 1 19 15 ri 1 t2 ti2 27 r2 rx 2 20 16 ri 2 4 tx 3 t3 ti3 28 3 tx 4 t4 ti4 1 r3 rx 3 21 17 ri 3 r4 rx 4 22 18 ri 4 26 t1 7 4 3 6 tx 2 tx 1 tx 3 tx 4 ti1 21 r3 18 17 ri 3 ri 4 rx3 t3 r1 rx1 19 28 ti3 15 ri 1 t2 ti2 27 r2 rx2 20 16 ri 2 28 t3 3 6 7 4 tx 4 tx 3 tx 1 tx 2 ti3 19 r1 16 15 ri 1 ri 2 rx1 t1 r3 rx3 21 26 ti1 17 ri 3 t4 ti4 1 r4 rx4 22 18 ri 4 28 t3 3 6 7 4 tx 4 tx 3 tx 1 tx 2 ti3 19 r1 16 15 ri 1 ri 2 rx1 t1 26 ti1 21 r3 18 17 ri 3 ri 4 rx3
2 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp33_00_0260
3 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp33_00_0260 ordering information model temperature range package types sp33 ct-l .......................................................................... 0c to +70c ............................................................................................. 28-pin wsoic sp33 ct-l/tr .................................................................... 0c to +70c ............................................................................................. 28-pin wsoic sp33 et-l....................................................................... -40c to +85c.............................................................................................28-pin wsoic sp33 et-l/tr................................................................. -40c to +85c.............................................................................................28-pin wsoic revision histor y date revision description 0-04-05 - legacy sipex datasheet 0/26/0 .0.0 convert to exar format. add revision history table. change revision to .0.0. add note 1 and change maximum rs-485 data rate at +85c. update abs max rating table. 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 effectiveness. 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 200 exar corporation datasheet january 200 send your interface technical inquiry with technical details to: uarttechsupport@exar.com reproduction, in part or whole, without the prior written consent of exar corporation is prohibited. note: /tr = tape and reel

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