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exar corporation 48720 kato road, fremont ca, 94538 ? (510) 668-7000 ? fax (510) 668-7017 ? www.exar.com sp339e rs-232/rs-485/rs-422 transceiver with internal termination oct 2011 rev. 1.0.0 general description the sp339 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 one driver and one receiver (1tx/1rx) in bo th half and full 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 sp339e operates from a single power supply, either 3.3v or 5v, with low id le current (2ma typical in all modes). 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 ? 1 driver, 1 receiver rs-485/422 full and half duplex configuration 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 sp338e 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 sp339eer1-l 40-pin qfn -40c to +85c active sp339eer1-l/tr 40-pin qfn -40c to +85c active SP339ECR1-L 40-pin qfn 0c to +70c active SP339ECR1-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) 20v driver output voltage (from ground) 20v 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 sp339e 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)
sp339e 3 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination pin descriptions by mode (mode1, mode0) pin name 00, figure 1 01, figure 2 10, figure 3 11, figure 4 1 l1 r1 output 1 1 2 l2 r2 output r1 output r1 output 3 l3 t1 input t1 input t1 input 4 l4 t2 input 5 l6 r3 output 1 1 6 l7 t3 input 7 l8 r4 output 1 1 8 l9 r5 output 1 1 9 vcc v cc 10 gnd ground 11 slew slew = v cc enables 250kbps slew limiting 12 dir1 t1 enable, r1 disable t1 enable 13 n/c this pin is not used and is disconnected internally 14 mode0 0 1 0 1 15 mode1 0 0 1 1 16 n/c this pin is not used and is disconnected internally 17 term enables rs-485/422 receiver termination 18 n/c this pin is not used and is disconnected internally 19 enable enable = v cc for operation, enable = 0v for shutdown 20 vcc v cc
sp339e 4 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0 pin descriptions by mode (mode1, mode0) pin name 00, figure 1 01, figure 2 10, figure 3 11, figure 4 21 r9 r5 input 22 r8 r4 input 23 gnd ground 24 r7 t3 output 25 r6 r3 input 26 gnd ground 27 r4 t2 output r1 input b 28 r3 t1 output r2 input a 29 gnd ground 30 r2 r2 input r1 input a, t1 out a t1 out a 31 r1 r1 input r1 input b, t1 out b t1 out b 32 vcc v cc 33 vss v ss - charge pump negative supply, 0.1 f 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, 0.1 f 38 vcc v cc 39 c2+ c 2+ - charge pump cap 2 positive lead, 0.1 f 40 vdd v dd - charge pump positive supply, 0.1 f to ground
sp339e 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 8 ma no load, idle inputs i cc supply current (rs-485) 2 8 ma no load, idle inputs i cc vcc shutdown current 1 10 a enable = 0v transmitter and logic input pins: pi ns 3, 4, 6, 11, 12, 14, 15, 17-19 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, 12, 14, 15, 17-19 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 sp339e 6 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0 electrical character istics (continued)
sp339e 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 5 -7v v cm +12v r term termination resistance 100 120 140 ? term = v cc , figure 5 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 6 1.5 v cc v r l = 54 ? (rs-485), figure 6 1.5 v cc v v cm = -7v, figure 7 1.5 v cc v v cm = +12v, figure 7 ? v od change in magnitude of differential output voltage -0.2 +0.2 v r l = 54 ? or 100 ? , figure 6 v cm driver commonmode output voltage 3 v r l = 54 ? or 100 ? , figure 6 ? v cm change in magnitude of common mode output voltage 0.2 v r l = 54 ? or 100 ? , figure 6 i osd driver output short circuit current 250 ma -7v v o +12v, figure 8 i o driver output leakage current 100 a dir1 = 0v in mode 11, or enable = 0v, -7v v o +12v
sp339e 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 9 ? 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 10 ? 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 10 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 10 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 9 ? 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 10 ? 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 10 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 10
sp339e 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 11 ? 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 12 ? 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 figure 13 t rhz , t rlz receiver output disable time 200 ns t dzh , t dzl driver output enable time 1000 ns figure 14 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 11 ? 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 12 ? 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 figure 13 t rhz , t rlz receiver output disable time 200 ns t dzh , t dzl driver output enable time 200 ns figure 14 t dhz , t dlz driver output disable time 200 ns
sp339e 10 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0 block diagram by mode (mode1, mode0) f igure 1. m ode 00 - l oopback
f igure 2. m ode 01 - rs-232 sp339e 11 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination
f igure 3. m ode 10 - rs-485 h alf d uplex sp339e 12 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0
f igure 4. m ode 11 - rs-485/422 f ull d uplex sp339e 13 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination
f igure 5. rs-485/422 r eceiver t ermination r esistance f igure 6. rs-485/422 d ifferential d river o utput v oltage f igure 7. rs-485/422 d ifferential d river o utput v oltage over c ommon m ode sp339e 14 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0 test fixtures
f igure 8. rs-485/422 d river o utput s hort c ircuit c urrent f igure 9. rs-232 r eceiver p ropagation d elay sp339e 15 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination
f igure 10. rs-232 d river p ropagation d elay f igure 11. rs-485/422 r eceiver p ropagation d elay sp339e 16 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0
f igure 12. rs-485/422 d river p ropagation d elay and r ise /f all t imes f igure 13. rs-485/422 r eceiver o utput e nable /d isable t imes sp339e 17 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination
f igure 14. rs-485/422 d river o utput e nable /d isable t imes sp339e 18 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0
sp339e 19 rev. 1.0.0 rs-232/rs-485/rs-422 transcei ver with internal termination product summary the sp339 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 one driver and one receiver (1tx /1rx) in both half and full duplex configurations. the rs-232 mode (3tx/5rx) provides full support of a ll 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 ac ross multiple serial protocols. a termination resistor may be necessary for accurate rs-485/422 communication, but must be removed when the lines are used for rs-232. sp339e provides an elegant solution to this pr oblem 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 sp339e 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 sp339e: 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 sp339e has passed both hbm and iec 61000-4-2 testing without damage. 20v fault tolerance all bus pins on the sp339e are protected against direct shor ts or long term faults, up to 20v. this allows the part to interoperate with legacy systems using 1 5v rs-232 logic levels wit hout damage or failure. diagnostic loopback mode the sp339e includes a diagnostic digital loop back mode for system testing as shown in figure 1 . the loopback mode connects the ttl driver inputs to the ttl receiver outputs, bypassing the analog driver and receiver circuitry. the analog/bus pins are internally disconnected in this mode.
f igure 15. qfn40 sp339e 20 rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0 package drawings
revision history d ate r evision d escription october 2011 1.0.0 production release 21 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 oct 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. sp339e rs-232/rs-485/rs-422 transceiver with internal termination rev. 1.0.0

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