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exar corporation 48720 kato road, fremont ca, 94538 ? (510) 668-7000 ? fax (510) 668-7017 ? www.exar.com sp330e rs-232/RS-485/rs-422 transceiver with 1.65v-5.5v interface november 2013 rev. 1.0.0 general description the sp330 is an advanced multiprotocol transceiver supporting rs-232, RS-485, and rs-422 serial standards and featuring a variable low voltage logic interface, down to 1.65v. full operation requires only four external charge pump capacitors. the RS-485/ rs-232 mode pin selects RS-485 mode when high, and rs-232 mode when low. in RS-485 mode the half/ full pin configures the transceiver as either half or full duplex. the high speed drivers operate up to 20mbps in rs- 485/422 modes, and up to 1mbps in rs-232 mode. all drivers can be slew limited to 250kbps in any mode to minimize electromagnetic interference (emi) by setting the dedicated slew pin low. all transmitter outputs and receiver inputs feature robust electrostatic discharge (esd) protection to ? 15kv iec 61000-4-2 airg ap, 15kv human body model (hbm) and 8kv iec 61000-4-2 contact. each receiver output has full fail-safe protection to avoid system lockup, oscillation, or indeterminate states by defaulting to logic-high output level when the inputs are open, shorted, or terminated but undriven. no external biasing resistors are required. the rs-232 receiver inputs include a 5k ? pull-down to ground when in rs-232 mode. the RS-485/422 receiver inputs are high impedance (>96k ? ), allowing up to 256 devices on a single communication bus ? (1/8th unit load). the sp330 operates from a single power supply, either 3.3v or 5v, with low idle current. the shutdown mode consumes less than 1 a in low power standby operation with rs-232 receivers enabled. features ? robust esd protection: 15kv iec 61000-4-2 air gap discharge 8kv iec 61000-4-2 contact discharge 15kv human body model (hbm) ? 20mbps RS-485 and 1mbps rs-232 data rates ? pin-selectable 250kbps slew limiting ? single supply operation from +3v to +5.5v ? 1.65v to 5.5v logic interface v l pin ? 2 drivers, 2 receivers rs-232/v.28 ? 1 driver, 1 receiver RS-485/422 full or half duplex configuration 1/8th unit load, up to 256 receivers on bus ? RS-485/422 enhanced receiver fail-safe for open, shorted, or terminated but idle inputs ? 10na shutdown supply current (typical) ? small 24 tssop package typical applications ? software programmable serial ports ? (rs-232, rs-422, RS-485) ? industrial and single board computers ? industrial and process control equipment ? point-of-sale equipment ? hvac controls and networking equipment ? building security and automation ordering information p art n umber p ackage o perating t emperature r ange d evice s tatus sp330eey-l 24-pin tssop -40c to +85c active sp330eey-l/tr 24-pin tssop -40c to +85c active n ote : sp330eey-l and sp3 30eey-l/tr are green / rohs compliant
sp330e 2 rs-232/RS-485/rs -422 transceiver with 1.65v-5.5v interface rev. 1.0.0 caution: esd (electrostatic discharge) sensitive device. permanent damage may occur on unconnected devices subject to high energy electrostatic fields. unused devices must be stored in conductive foam or shunts. personnel should be properly grounded prior to handling this device. the protective foam should be discharged to the destination socket before devices are removed. esd protection absolute maximum ratings these are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections to the specifications below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability and cause permanent damage to the device. supply voltage v cc -0.3v to +6.0v logic interface voltage v l v l ? v cc voltage at ttl input pins -0.3v to +6.0v receiver input voltage (from ground) 18v driver output voltage (from ground) 18v short circuit duration, tx out to ground continuous storage temperature range -65c to +150c lead temperature (soldering, 10s) +300c power dissipation 24-pin tssop (derate 26.0mw/c above +70c) 900mw m in . t yp . m ax . u nits tx output & rx input pins 15 kv iec 61000-4-2 airgap 8 kv iec 61000-4-2 contact 15 kv human body model (hbm) all other pins 3 kv human body model (hbm)
sp330e 3 rev. 1.0.0 rs-232/RS-485/rs-422 transceive r with 1.65v-5.5v interface electrical characteristics u nless otherwise noted : ? v cc = +3.0v to +5.5v, c1-c4 = 0.1 f; t a = t min to t max . typical values are at v l = v cc = 3.3v, t a = +25c. s ymbol p arameters m in . t yp . m ax . u nits c onditions dc characteristics i cc supply current (rs-232) 1 2.5 ma no load, idle inputs, RS-485/ rs-232 = 0v i cc supply current (RS-485/422) 1.8 4.5 ma no load, idle inputs, RS-485/ rs-232 = v cc i cc vcc shutdown current 0.01 1 a shdn = 0v, receiver inputs open or grounded transmitter and logic inputs (pins 11 - 14 & 18 - 20) v il logic input voltage low v l 3 v v ih logic input voltage high 2v l 3 v i inl logic input leakage current 0.01 1 a i inpd logic input pulldown current 10 50 a re pin 18, v in = v l v hys logic input hysteresis 200 mv rs-232 and RS-485/422 receiver outputs (pins 8 & 9) v ol receiver output voltage low 0.4 v i out = 1.5ma v oh receiver output voltage high v l -0.6 v i out = -1.5ma i oss receiver output short circuit current 20 85 ma 0 ? v o ?? v l i oz receiver output leakage current 0.05 1 a 0 ?? v o ?? v l, receivers disabled
sp330e 4 rs-232/RS-485/rs -422 transceiver with 1.65v-5.5v interface rev. 1.0.0 electrical characteristics (continued) u nless otherwise noted : ? v cc = +3.0v to +5.5v, c1-c4 = 0.1 f; t a = t min to t max . typical values are at v cc = 3.3v, t a = +25c. s ymbol p arameters m in . t yp . m ax . u nits c onditions rs-232 single-ended receiver inputs (pins 16 & 17) v in input voltage range -15 +15 v v il input threshold low 0.6 1.2 v v cc = 3.3v 0.8 1.5 v v cc = 5.0v v ih input threshold high 1.5 2.0 v v cc = 3.3v 1.8 2.4 v v cc = 5.0v v hys input hysteresis 0.5 v r in input resistance 3 5 7 k ? -15v ? v in ? +15v rs-232 single-ended transmitter outputs (pins 6 & 7) v out output voltage swing 5.0 5.5 v outputs loaded with 3k ? to gnd r off output power off impedance 300 10m ? v cc = 0v, v out = 2v i sc output short circuit current 30 60 ma v out = 0v i o output leakage current 125 a shdn = 0v, v out = 9v, v cc = 0v or 5.5v
sp330e 5 rev. 1.0.0 rs-232/RS-485/rs-422 transceive r with 1.65v-5.5v interface electrical characteristics (continued) u nless otherwise noted : ? v cc = +3.0v to +5.5v, c1-c4 = 0.1 f; t a = t min to t max . typical values are at v cc = 3.3v, t a = +25c. s ymbol p arameters m in . t yp . m ax . u nits c onditions RS-485/422 differential receiver inputs (a,b) r in receiver input resistance 96 k ? -7v ? v cm ? +12v i in receiver input current 125 a v in = +12v -100 a v in = -7v v th receiver differential threshold voltage -200 -125 -50 mv -7v ? v cm ? +12v ? v th receiver input hysteresis 25 mv RS-485/422 differential driver outputs (y, z) v od differential driver output 1.5 v cc v r l = 54 ? (RS-485), figure 4 1.5 v cc v -7v ? v cm ? +12v, figure 5 2 v cc v r l = 100 ? (rs-422), figure 4 ? ? v od ? change in magnitude of differential output voltage 0.2 v r l = 54 ? or 100 ? , figure 4 v cm driver common mode output voltage 3 v r l = 54 ? or 100 ? , figure 4 ? ? v cm ? change in magnitude of common mode output voltage 0.2 v r l = 54 ? or 100 ? , figure 4 i osd driver output short circuit current 250 ma -7v ? v y or v z ?? +12v, figure 6 i o driver output leakage current 125 a de = 0v or shdn = 0v, v y or v z = -7v or +12v, v cc = 0v or 5.5v
sp330e 6 rs-232/RS-485/rs -422 transceiver with 1.65v-5.5v interface rev. 1.0.0 timing characteristics u nless otherwise noted : ? v cc = +3.0v to +5.5v, c1-c4 = 0.1 f; t a = t min to t max . typical values are at v cc = 3.3v, t a = +25c. s ymbol p arameters m in . t yp . m ax . u nits c onditions all modes t enable enable from shutdown 1000 ns t shutdown enable to shutdown 1000 ns rs-232, data rate = 250kbps ( slew = 0v), one transmitter switching maximum data rate 250 kbps r l = 3k ? , c l = 1000pf t rhl , t rlh receiver propagation delay 100 ns c l = 150pf, figure 7 ? t rhl -t rlh ? receiver propagation delay skew 100 ns t dhl , t dlh driver propagation delay 1400 ns r l = 3k ? , c l = 2500pf, figure 8 ? t dhl -t dlh ? driver propagation delay skew 600 ns t shl, t slh transition region slew rate from +3.0v to -3.0v or -3.0v to +3.0v 6 30 v/ s v cc = +3.3v, r l = 3k ? to 7k ? , c l = 150pf to 2500pf, t a = 25c, figure 8 t shl, t slh transition region slew rate from +3.0v to -3.0v or -3.0v to +3.0v 4 30 v/ s v cc = +3.3v, r l = 3k ? to 7k ? , c l = 150pf to 2500pf, figure 8 rs-232, data rate = 1mbps ( slew = v cc ), one transmitter switching maximum data rate 1 mbps r l = 3k ? , c l = 250pf t rhl , t rlh receiver propagation delay 100 ns c l = 150pf, figure 7 ? t rhl -t rlh ? receiver propagation delay skew 100 ns t dhl , t dlh driver propagation delay 300 ns r l = 3k ? , c l = 1000pf, figure 8 ? t dhl -t dlh ? driver propagation delay skew 150 ns t shl, t slh transition region slew rate from +3.0v to -3.0v or -3.0v to +3.0v 13 150 v/ s v cc = +3.3v, r l = 3k ? to 7k ? , c l = 150pf to 1000pf, figure 8 t shl, t slh transition region slew rate from +3.0v to -3.0v or -3.0v to +3.0v 24 150 v/ s v cc = +3.3v, r l = 3k ? to 7k ? , c l = 150pf to 1000pf, t a = 25c, figure 8
sp330e 7 rev. 1.0.0 rs-232/RS-485/rs-422 transceive r with 1.65v-5.5v interface timing characteristics (continued) u nless otherwise noted : ? v cc = +3.0v to +5.5v, c1-c4 = 0.1 f; t a = t min to t max . typical values are at v cc = 3.3v, t a = +25c. s ymbol p arameters m in . t yp . m ax . u nits c onditions RS-485/rs-422, data rate = 250kbps ( slew = 0v), one transmitter switching maximum data rate 250 kbps r l = 54 ? , c l = 50pf t rphl , t rplh receiver propagation delay 50 150 ns c l = 15pf, figure 9 ? t rphl -t rplh ? receiver propagation delay skew 10 ns t dphl , t dplh driver propagation delay 500 1000 ns r l = 54 ? , c l = 50pf, figure 10 ? t dphl -t dplh ? driver propagation delay skew 100 ns t dr, t df driver rise and fall time 300 650 1200 ns t rzh , t rzl receiver output enable time 200 ns c l = 15pf, figure 11 t rhz , t rlz receiver output disable time 200 ns t dzh , t dzl driver output enable time 1000 ns r l = 500 ? , c l = 50pf, figure 12 t dhz , t dlz driver output disable time 200 ns RS-485/rs-422, data rate = 20mbps ( slew = v cc ), one transmitter switching maximum data rate 20 mbps r l = 54 ? , c l = 50pf t rphl , t rplh receiver propagation delay 50 150 ns c l = 15pf, figure 9 ? t rphl -t rplh ? receiver propagation delay skew 10 ns t dphl , t dplh driver propagation delay 30 100 ns r l = 54 ? , c l = 50pf, figure 10 ? t dphl -t dplh ? driver propagation delay skew 10 ns t dr, t df driver rise and fall time 10 20 ns t rzh , t rzl receiver output enable time 200 ns c l = 15pf, figure 11 t rhz , t rlz receiver output disable time 200 ns t dzh , t dzl driver output enable time 200 ns r l = 500 ? , c l = 50pf, figure 12 t dhz , t dlz driver output disable time 200 ns
sp330e 8 rs-232/RS-485/rs -422 transceiver with 1.65v-5.5v interface rev. 1.0.0 pin descriptions pin name rs-232 RS-485 full duplex RS-485 half duplex 1 c1+ charge pump cap 1 positive lead, 0.1 f 2 vl logic supply for ttl inputs and outputs, v l = +1.65v to +5.5v or tie to v cc 3 vcc main supply, v cc = +3.0v to +5.5v, bypa ss to ground with 1.0 f 4 c1- charge pump cap 1 negative lead 5 gnd ground 6 t1out, b/z transmitter 1 output z driver neg output b/z neg input/output 7 t2out, a/y transmitter 2 output y driver pos output a/y pos input/output 8 r1out receiver 1 output x x 9 r2out, ro receiver 2 output receiver ttl output receiver ttl output 10 11 shdn low power shutdown mode when low 12 slew data rate limited to 250kbps when low 13 RS-485/ rs-232 0 1 1 14 half/ full x 0 1 15 gnd ground 16 r2in, a receiver 2 input a pos receiver input x 17 r1in, b receiver 1 input b neg receiver input x 18 re x receiver enabled when low 19 t2in, de transmitter 2 input driver enabled when high 20 t1in, di transmitter 1 input driver ttl input 21 v- charge pump negative supply, 0.1 f from ground 22 c2- charge pump cap 2 negative lead 23 c2+ charge pump cap 2 positive lead, 0.1 f 24 v+ charge pump positive supply, 0.1 f to ground
sp330e 9 rev. 1.0.0 rs-232/RS-485/rs-422 transceive r with 1.65v-5.5v interface suggested db9 connector pinout db9 pin rs-232 RS-485 full duplex RS-485 half duplex 1 2 rxd rx+ 3 txd tx- data- 4 5 ground 6 7 rts tx+ data+ 8 cts rx- 9
sp330e 10 rs-232/RS-485/rs -422 transceiver with 1.65v-5.5v interface rev. 1.0.0 block diagrams f igure 1. rs-232 m ode pin 18 has a 300k ? internal pull-down (not shown). t1out t2out r1out r2out 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 c2 0.1f c3 0.1f cc 1.0f t2 r1 r2 t1 c4 0.1f c1 0.1f c1+ v l v cc c1- gnd _____ shdn _____ slew v+ c2+ c2- v- gnd ______ RS-485/rs-232 t1in t2in r1in r2in sp330 24 pin tssop rs-232 5k " 5k "
sp330e 11 rev. 1.0.0 rs-232/RS-485/rs-422 transceive r with 1.65v-5.5v interface f igure 2. RS-485 f ull d uplex m ode pin 18 has a 300k ? internal pull-down (not shown). v+ c2+ c2- v- gnd ____ half/full ______ RS-485/rs-232 z y ro 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 c2 0.1f c3 0.1f cc 1.0f c4 0.1f c1 0.1f c1+ v l v cc c1- gnd _____ shdn _____ slew di de __ re b a sp330 24 pin tssop RS-485 full duplex r d
sp330e 12 rs-232/RS-485/rs -422 transceiver with 1.65v-5.5v interface rev. 1.0.0 f igure 3. RS-485 h alf d uplex m ode pin 18 has a 300k ? internal pull-down (not shown). v+ c2+ c2- v- gnd ____ half/full ______ RS-485/rs-232 b/z a/y ro 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 c2 0.1f c3 0.1f cc 1.0f c4 0.1f c1 0.1f c1+ v l v cc c1- gnd _____ shdn _____ slew di de __ re sp330 24 pin tssop RS-485 half duplex r d
sp330e 13 rev. 1.0.0 rs-232/RS-485/rs-422 transceive r with 1.65v-5.5v interface test circuits f igure 4. RS-485/422 d ifferential d river o utput v oltage f igure 5. RS-485/422 d ifferential d river o utput v oltage over c ommon m ode f igure 6. RS-485/422 d river o utput s hort c ircuit c urrent d v od v cm de = v l di=0vorv l z y r l 2 r l 2 d v od v cm 60 " 375 " 375 " z y de = v l di=0vorv l d -7v to +12v v z y i osd de = 0v or v l di=0vorv l
sp330e 14 rs-232/RS-485/rs -422 transceiver with 1.65v-5.5v interface rev. 1.0.0 f igure 7. rs-232 r eceiver p ropagation d elay f igure 8. rs-232 d river p ropagation d elay c l rx v in v out +3v -3v v oh v ol t rhl t rlh v in v out 1.5v 1.5v v l 2 v l 2 r l c l tx v in v out v l 0v +3v -3v t shl t slh v in v out t dhl 0v 0v t dlh v l 2 v l 2
sp330e 15 rev. 1.0.0 rs-232/RS-485/rs-422 transceive r with 1.65v-5.5v interface f igure 9. RS-485/422 r eceiver p ropagation d elay f igure 10. RS-485/422 d river p ropagation d elay and r ise /f all t imes c l b a r re = 0v ro b a ro t rplh t rphl +1v 0v -1v v oh v ol v l 2 v l 2 d v od r l c l z y de = v l di v l 0v z y v od+ 0v v od- v od 90% 10% 90% 10% t dr t df t dplh t dphl di v od (v y -v z ) t skew =|t dphl ? t dplh | v l 2 v l 2
sp330e 16 rs-232/RS-485/rs -422 transceiver with 1.65v-5.5v interface rev. 1.0.0 f igure 11. RS-485/422 r eceiver o utput e nable /d isable t imes r l c l ro b a r re v l 0v v oh 0v v oh 2 v oh -0.25v t rzh t rhz re v a =v cc v b =0v ro v l 2 v l 2 c l ro b a r re r l v l v l 0v v l v ol v l +v ol 2 v ol +0.25v t rzl t rlz re v a =0v v b =v cc ro v l 2 v l 2
sp330e 17 rev. 1.0.0 rs-232/RS-485/rs-422 transceive r with 1.65v-5.5v interface f igure 12. RS-485/422 d river o utput e nable /d isable t imes r l c l d testingz:di=0v testingy:di=v l de z y v out v l 0v v oh v ol de v out v oh +v ol 2 v oh -0.25v t dzh t dhz v l 2 v l 2 r l c l d de v cc z y v out testingz:di=v l testingy:di=0v v l 0v v oh v ol t dzl t dlz de v out v oh +v ol 2 v ol +0.25v v l 2 v l 2
sp330e 18 rs-232/RS-485/rs -422 transceiver with 1.65v-5.5v interface rev. 1.0.0 product summary the sp330 is an advanced multiprotocol transceiver supporting rs-232, RS-485, and rs-422 serial standards. the multiple configuration modes allow all three protocols to be used interchangeably over a single cable or connector with no additional switching components. full operation requires only four external charge pump capacitors. enhanced failsafe the enhanced failsafe feature of the sp330 guarantees a logic-high receiver output when the receiver inputs are open, shorted, or terminated but idle/undriven. the enhanced failsafe interprets 0v differential as a logic high with a minimum 50mv noise margin, while maintaining compliance with the eia/tia-485 standard of 200mv. no external biasing resistors are required, further easing the usage of multiple protocols over a single connector. 15kv esd protection esd protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. the bus pins (driver outputs and receiver inputs) have extra protection structures, which have been tested up to 15kv without damage. these structures withstand high esd in all states: normal operation, in shutdown, and when powered off. esd protection is be tested in various ways. exar uses the following methods to qualify the protection structures designed into sp330: 8kv using iec 61000-4-2 contact discharge 15kv using iec 61000-4-2 airgap discharge 15kv using the human body model (hbm) the iec 61000-4-2 standard is more rigorous than hb m, resulting in lower volt age levels compared with hbm for the same level of esd protection. because iec 61000-4-2 specifies a lower series resistance, the peak current is higher than hbm. the sp330 has passed both hbm and iec 61000-4-2 testing without damage. variable logic level voltage the sp330 includes a v l pin which reduces the logic level thresholds to interface with processors operating at reduced supply voltages. this pin should be connected to the supply voltage of the processor or uart block, or can be connected to v cc for typical logic levels.
sp330e 19 rev. 1.0.0 rs-232/RS-485/rs-422 transceive r with 1.65v-5.5v interface truth tables t able 1: rs-232 tx t ruth t able inputs outputs shdn RS-485/ rs-232 di/t1in, de/t2in z(b)/t1out, y(a)/t2out 0 x x 1/8th unit load 1 0 0 1 1 0 1 0 1 1 x RS-485 mode t able 2: rs-232 rx t ruth t able inputs outputs shdn RS-485/ rs-232 b/r1in, a/r2in r1out, ro/r2out x 0 0 1 x 0 1 0 x 0 inputs open 1 x 1 x r1out high-z, ro/r2out in RS-485 mode
sp330e 20 rs-232/RS-485/rs -422 transceiver with 1.65v-5.5v interface rev. 1.0.0 t able 3: RS-485/422 tx t ruth t able inputs outputs shdn RS-485/ rs-232 de/t2in di/t1in z(b)/t1out y(a)/t2out 0 x x x 1/8th unit load 1/8th unit load 1 1 0 x 1/8th unit load 1/8th unit load 1 1 1 0 1 0 1 1 1 1 0 1 x 0 x x rs-232 mode t able 4: RS-485/422 rx t ruth t able inputs output RS-485/ rs-232 shdn half/ full re (a-b) (y-z) ro/r2out 1 0 x x x x high-z 1 1 0 0 ? ? -50mv x 1 1 1 0 0 ? -200mv x 0 1 1 0 0 floating x 1 1 1 1 0 x ? ? -50mv 1 1 1 1 0 x ? -200mv 0 1 1 1 0 x floating 1 1 1 x 1 x x high-z 0 x x x x x rs-232 mode
sp330e 21 rev. 1.0.0 rs-232/RS-485/rs-422 transceive r with 1.65v-5.5v interface package drawings f igure 13. tssop 24 d rawing ecn 1347-07 11/19/2013
sp330e 22 rs-232/RS-485/rs -422 transceiver with 1.65v-5.5v interface rev. 1.0.0 f igure 14. tssop 24 d imensions
23 notice exar corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. exar corporation 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 infringement. charts and schedules contained 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 checked; no responsibilit y, 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 ca n reasonably be expected to cause failure of the life support syst em or to significantly affect its safety or effectiveness. products are not authorized for use in such applications unless exar corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liabilit y of exar corporation is adequately protected under the circumstances. copyright 2013 exar corporation datasheet november 2013. 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 corporation is prohibited. sp330e rev. 1.0.0 rs-232/RS-485/rs-422 transceive r with 1.65v-5.5v interface revision history d ate r evision d escription nov 2013 1.0.0 production release

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