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exar corporation 48720 kato road, fremont ca, 94538 ? (510) 668-7000 ? fax (510) 668-7017 ? www.exar.com sp338e rs-232/rs-485/rs-422 transceiver with internal termination november 2011 rev. 1.0.0 general description the sp338 is an advanced multiprotocol transceiver supporting rs-232, rs-485, and rs-422 serial standards in a 40 pin qfn package. integrated cable termination and four configuration modes allow all three protocols to be used interchangeably over a single cable or connector wit h no additional switching components. full operation requires only four external charge pump capacitors. the rs-485/422 modes feature up to two drivers and four receivers (2tx/4rx) in half, full, and mixed duplex configurations. the rs-232 mode (3tx/5rx) provides full support of all eight signals commonly used with the db9 rs-232 connector. a dedicated diagnostic loopback mode is also provided. 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). all transmitter outputs and receiver inputs feature robust electrostatic discharge (esd) protection to 15kv human body model (hbm) and 8kv iec- 61000-4-2 contact. each receiver output has full fail- safe protection to avoid sy stem lockup, oscillation, or indeterminate states by def aulting 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. the rs-485/422 receiver inputs are high impedance (>96k ? when termination is disabled), allowing up to 256 devices on a single communication bus (1/8th unit load). the sp338 operates from a single power supply, either 3.3v or 5v, with low idle current. the shutdown mode consumes less than 10a for low power standby operation. features ? pin selectable cable termination ? no external resistors required for rs-485/422 termination and biasing ? 3.3v or 5v single supply operation ? robust esd protection on bus pins 15kv human body model (hbm) 8kv iec 61000-4-2 (contact) ? max data rate of 20mbps in rs-485/422 modes and up to 1mbps in rs-232 modes ? pin selectable 250kbps slew limiting ? 3 drivers, 5 receivers rs-232/v.28 ? 2 drivers, 4 receivers rs-485/422 full, half, and mixed duplex configurations 1/8th unit load, up to 256 receivers on bus ? rs-485/422 enhanced failsafe for open, shorted, or terminated but idle inputs ? space saving 6mm x 6mm qfn-40 package ? pin compatible with sp339e typical applications ? dual protocol serial ports (rs-232 or rs-485/422) ? industrial computers ? industrial and process control equipment ? point-of-sale equipment ? networking equipment ? hvac controls equipment ? building security and automation equipment ordering information p art n umber p ackage o perating t emperature r ange d evice s tatus sp338eer1-l 40-pin qfn -40c to +85c active sp338eer1-l/tr 40-pin qfn -40c to +85c active SP338ECR1-L 40-pin qfn 0c to +70c active SP338ECR1-L/tr 40-pin qfn 0c to +70c active
absolute maximum ratings these are stress ratings only and functional operation of the device at these rating s or any other above those indicated in the operation sections to the specificati ons below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliabili ty and cause permanent damage to the device. supply voltage v cc -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 voltage at ttl input pins -0.3v to (v cc + 0.5v) storage temperature range -65c to +150c lead temperature (soldering, 10s) +300c power dissipation 40-pin qfn (derate 17mw/c above +70c) 500mw sp338e 2 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0 caution: esd (electrostatic discharge) sensitive device. perman ent 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 m in . t yp . m ax . u nits r1-r9 tx output & rx input pins 15 kv human body model (hbm) 8 kv iec 61000-4-2 (contact) all other pins 2 kv human body model (hbm)
sp338e 3 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination pin descriptions by mode (mode2, mode1, mode0) pin name 000, figure 1 001, figure 2 010, figure 3 011, figure 4 100, figure 5 101, figure 6 110, figure 7 111, figure 8 1 l1 r1 output 1 1 1 1 1 1 2 l2 r2 output r1 output r1 output r1 output r1 output r1 output r1 output 3 l3 t1 input t1 input t1 input t1 input t1 input t1 input t1 input 4 l4 t2 input 5 l6 r3 output 1 1 1 1 1 r2 output 6 l7 t3 input t2 input t2 input 7 l8 r4 output 1 1 r2 output 1 1 r3 output 8 l9 r5 output 1 1 1 1 1 r4 output 9 vcc v cc 10 gnd ground 11 slew slew = v cc enables 250kbps slew limiting 12 dir1 t1 enable, r1 disable t1 enable t1 enable t1 enable t1 enable, r1 disable t1 enable, r1 disable 13 dir2 t2 enable t2 enable, r2 disable 14 mode0 0 1 0 1 0 1 0 1 15 mode1 0 0 1 1 0 0 1 1 16 mode2 0 0 0 0 1 1 1 1 17 term enables rs-485/422 receiver termination 18 invdir inverts dir1 and dir2, where applicable 19 enable enable = v cc for operation, enable = 0v for shutdown 20 vcc v cc
sp338e 4 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0 pin descriptions by mode (mode2, mode1, mode0) pin name 000, figure 1 001, figure 2 010, figure 3 011, figure 4 100, figure 5 101, figure 6 110, figure 7 111, figure 8 21 r9 r5 input r2 input b r1 input b r4 input b 22 r8 r4 input r2 input a r4 input a 23 gnd ground 24 r7 t3 output t2 out a r1 input a r3 input a t2 out a 25 r6 r3 input t2 out b r3 input b t2 out b 26 gnd ground 27 r4 t2 output r1 input b r1 input b t1 out a r1 input a t1 out a r2 input b 28 r3 t1 output r2 input a r1 input a r2 input a 29 gnd ground 30 r2 r2 input r1 input a t1 out a t1 out a t1 out a r1 input a t1 out a 31 r1 r1 input r1 input b t1 out b t1 out b t1 out b t1 out b r1 input b t1 out b r1 input b t1 out b 32 vcc v cc 33 vss v ss - charge pump negative s upply, 0.1uf from ground 34 c2- c 2+ - charge pump cap 2 negative lead 35 c1- c 1- - charge pump cap 1 negative lead 36 gnd ground 37 c1+ c 1+ - charge pump cap 1 positive lead, 0.1uf 38 vcc v cc 39 c2+ c 2+ - charge pump cap 2 positive lead, 0.1uf 40 vdd v dd - charge pump positive supply, 0.1uf to ground
sp338e 5 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination electrical characteristics u nless otherwise noted : v cc = +3.3v 5% or +5.0v 5%, 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 dc characteristics i cc supply current (rs-232) 2 10 ma no load, idle inputs i cc supply current (rs-485) 4 10 ma no load, idle inputs i cc vcc shutdown current 1 10 a enable = 0v transmitter and logic input pi ns: pins 3, 4, 6, 11-19 v ih logic input voltage high 2.0 v v cc = 3.3v v ih logic input voltage high 2.4 v v cc = 5.0v v il logic input voltage low 0.8 v i il logic input leakage current low 1 a input low (v in = 0v) i ih logic input leakage current high 1 a input high (v in = v cc ), pins 3, 4 and 6 i pd logic input pull-down current 50 a input high (v in = v cc ), pins 11-19 v hys logic input hysteresis 200 mv receiver outputs: pins 1, 2, 5, 7, 8 v oh receiver output voltage high v cc -0.6 v i out = -1.5ma v ol receiver output voltage low 0.4 v i out = 2.5ma i oss receiver output shortcircuit current 20 60 ma 0 v o v cc i oz receiver output leakage current 0.1 1 a 0 v o v cc, receivers disabled
u nless otherwise noted : v cc = +3.3v 5% or +5.0v 5%, 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 single-ended receiver inputs (rs-232) 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 0.3 v r in input resistance 3 5 7 k ? -15v v in +15v single-ended driver outputs (rs-232) v o output voltage swing 5.0 5.5 v output loaded with 3k ? to gnd 7.0 v no load output i sc short circuit current 60 ma v o = 0v r off power off impedance 300 10m ? v cc = 0v, v o = 2v sp338e 6 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0 electrical character istics (continued)
sp338e 7 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination electrical characteristics (continued) u nless otherwise noted : v cc = +3.3v 5% or +5.0v 5%, 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 differential receiver in puts (rs-485 / rs-422) r in receiver input resistance 96 k ? term = 0v, -7v v in +12v v th receiver differential threshold voltage -200 -125 -50 mv ? v th receiver input hysteresis 25 mv v cm = 0v i in receiver input current 125 a v in = +12v -100 a v in = -7v r term termination resistance 100 120 155 ? term = v cc , figure 9 -7v v cm +12v r term termination resistance 100 120 140 ? term = v cc , figure 9 v cm = 0v differential driver ou tputs (rs-485 / rs-422) v od differential driver output 2 v cc v r l = 100 ? (rs-422), figure 10 1.5 v cc v r l = 54 ? (rs-485), figure 10 1.5 v cc v v cm = -7v, figure 11 1.5 v cc v v cm = +12v, figure 11 ? v od change in magnitude of differential output voltage -0.2 +0.2 v r l = 54 ? or 100 ? , figure 10 v cm driver commonmode output voltage 3 v r l = 54 ? or 100 ? , figure 10 ? v cm change in magnitude of common mode output voltage 0.2 v r l = 54 ? or 100 ? , figure 10 i osd driver output short circuit current 250 ma -7v v o +12v, figure 12 i o driver output leakage current 100 a enable = 0v, or dir1 = 0v and dir2 = 0v in full duplex modes, -7v v o +12v
sp338e 8 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0 timing characteristics u nless otherwise noted : v cc = +3.3v 5% or +5.0v 5%, 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 = vcc), 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 13 ? 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 14 ? 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 4 30 v/ s v cc = 3.3v, r l = 3k ? to 7k ?, c l = 150pf to 2500pf, figure 14 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 14 rs-232, data rate = 1mbps (slew = 0v), one trans mitter 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 13 ? 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 14 ? 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 15 150 v/ s v cc = 3.3v, r l = 3k ? to 7k ?, c l = 150pf to 1000pf, figure 14 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 14
sp338e 9 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination timing characteris tics (continued) u nless otherwise noted : v cc = +3.3v 5% or +5.0v 5%, 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 = vcc), 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 15 ? t rphl -t rplh ? receiver propagation delay skew 20 ns t dphl , t dplh driver propagation delay 500 1000 ns r l = 54 ?, c l = 50pf, figure 16 ? 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 17 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 18 t dhz , t dlz driver output disable time 200 ns rs-485/rs-422, data rate = 20mbps (slew = 0v), 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 15 ? 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 16 ? 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 17 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 18 t dhz , t dlz driver output disable time 200 ns
sp338e 10 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0 block diagram by mode (mode2, mode1, mode0) f igure 1. m ode 000 - l oopback
f igure 2. m ode 001 - rs-232 sp338e 11 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination
f igure 3. m ode 010 - rs-485 h alf d uplex #1 sp338e 12 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0
f igure 4. m ode 011 - rs-485/422 f ull d uplex #1 sp338e 13 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination
f igure 5. m ode 100 - rs-485/422 f ull d uplex #2 sp338e 14 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0
f igure 6. m ode 101 - rs-485/422 f ull d uplex #3 sp338e 15 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination
f igure 7. m ode 110 - rs-485 h alf d uplex #2 sp338e 16 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0
f igure 8. m ode 111 - rs-485/422 m ixed d uplex sp338e 17 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination
f igure 9. rs-485/422 r eceiver t ermination r esistance f igure 10. rs-485/422 d ifferential d river o utput v oltage f igure 11. rs-485/422 d ifferential d river o utput v oltage over c ommon m ode sp338e 18 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0 test fixtures
f igure 12. rs-485/422 d river o utput s hort c ircuit c urrent f igure 13. rs-232 r eceiver p ropagation d elay sp338e 19 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination
f igure 14. rs-232 d river p ropagation d elay f igure 15. rs-485/422 r eceiver p ropagation d elay sp338e 20 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0
f igure 16. rs-485/422 d river p ropagation d elay and r ise /f all t imes f igure 17. rs-485/422 r eceiver o utput e nable /d isable t imes sp338e 21 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination
f igure 18. rs-485/422 d river o utput e nable /d isable t imes sp338e 22 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0
sp338e 23 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination product summary the sp338 is an advanced multiprotocol transceiver su pporting rs-232, rs-485, and rs-422 serial standards in a 40 pin qfn package. integrated cable termination an d four configuration modes allow all three protocols to be used interchangeably over a si ngle cable or connector with no additi onal switching components. the rs- 485/422 modes feature up to two drivers and four receivers (2tx/4rx) in ha lf, full, and mixed duplex configurations. the rs-232 mode (3tx/5rx) provides fu ll support of all eight signals commonly used with the db9 rs-232 connector. a dedicated mode is also available for diagnostic loopback testing. internally switched cable termination enabling and disabling the rs -485/422 term ination resistor is one of the la rgest challenges system designers face when sharing a single connector or pair of lines bet ween multiple serial protoc ols. a termination resistor may be necessary for accurate rs-485/422 communication, but must be removed when the lines are used for rs-232. sp338 provides an elegant so lution to this problem by integrating the termination resistor and switching control, and allowing it to be switched in and ou t of the circuit with a single pin. no external switching components are required. enhanced failsafe ordinary rs-485 differential receiver s will be in an indetermin ate state whenever the data bus is not being actively driven. the enhanced failsafe feature of the sp338 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 no ise margin, while maintaini ng compliance with the eia/tia- 485 standard of 200mv. no external biasing resistor s 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 electros tatic 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, shutdown and powered down. esd protection is be tested in various ways. exar uses the following methods to qualify the protection structures designed into sp338: 15kv using the human body model (hbm) -8kv using iec 61000-4-2 contact discharge the iec 61000-4-2 standard is more rigorous than hbm, resulting in lower voltage 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 sp338 has passed both hbm and iec 61000-4-2 testing without damage. diagnostic loopback mode the sp338 includes a diagnostic digital loop ba ck mode for system testing as shown in figure 1 . the loopback mode connects the ttl driver inputs to the ttl receiv er outputs, bypassing the analog driver and receiver circuitry. the analog/bus pins are in ternally disconnected in this mode.
f igure 19. qfn40 sp338e 24 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0 package drawings
revision history d ate r evision d escription november 2011 1.0.0 production release 25 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 november 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. sp338e rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0

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