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? 2014 exar corporation xr32430/xr32431 3-driver/5-receiver intelligent rs-232 transceiver with 1.65v-5.5v interface exar.comxr32430_xr32431 rev 1a 1 / 13 general description the xr32430 and xr32431 products are 3 driver/ 5 receiver rs-232 transceivers. the xr32431 features a variable low volt- age logic interface, down to 1.65v. these products are intended for portable or hand-held applications such as notebook and palmtop computers. the xr32430eb and xr32431eb devices feature slew-rate limited outputs for reduced crosstalk and emi. the xr32430eh and xr32431eh devices are optimized for mid speed applications, with data rates up to 460kbps. the xr32430eu and xr32431eu devices are optimized for high speed designs with data rates up to 1mbps, easily meeting the demands of high speed rs-232 applications. the xr32430/31 uses an internal high-efficiency charge-pump power supply that requires only four 0.1 f capacitors in 3.3v operation. this charge pump combined with exar's driver archi- tecture allow the xr32430/31 to deliver compliant rs-232 perfor- mance from a single power supply ranging from +3.0v to +5.5v. the auto on-line? feature allows the device to automatically "wake-up" during a shutdown state when an rs-232 cable is con- nected and a connected peripheral is turned on. otherwise, the device automatically shuts itse lf down drawing less than 1 a. features ? meets true eia/tia- 232-f standards from a +3.0v to 5.5v power supply ? interoperable with ei a/tia-232 and adheres to eia/tia-562 down to a +2.7v power source ?1.65v to 5.5v logic interface v l pin (xr32431) ? auto on-line circuitry automatically wakes up from a 1 ? a shutdown ? regulated charge pump yields stable rs-232 outputs regardless of v cc variations ? enhanced esd specifications ? 15kv human body model ? 15kv iec61000-4-2 air discharge ? 8kv iec61000-4-2 contact discharge ? 250kbps/460kbps/1mbps min transmission rates (speed grades b/h/u) ? -40c to 85c ambient operating temperature ? lead-free (rohs 6) package applications ? industrial and single board computers ? industrial and proc ess control equipment ? point-of-sales equipment ? building security and automation ordering information C page 13 typical xr32431 applicat ion and package pinout t3out t2out t2in t3in r2in r2out r2out shutdown online status charge pump c1+ c1- c2+ c2- v+ v- rs-232 outputs rs-232 inputs ttl/cmos inputs ttl/cmos outputs auto on-line / control 5k ? t1out t1in r1in r1out 5k ? r4in r5in r4out r5out 5k ? 5k ? r3in r3out 5k ? 0.1 ? f v cc v cc v l v l 0.1 ? f 25 26 0.1 ? f 0.1 ? f 0.1 ? f 0.1 ? f to ? -p supervisor circuit v cc 23 28 29 30 30 26 22 21 20 1 2 3 4 5 6 7 8 12 11 10 18 17 19 15 14 13 24 1 2 3 4 5 9 10 11 17 6 12 18 nc r1in r2in t1out t2out nc nc t2in t1in r5out r1out c1- gnd vl vcc v+ c1+ c2+ c2- v- 25 26 27 29 30 31 32 28 r3in r4in r5in t3out t3in r2out r3out r4out r2out xr32431 32 pin qfn (5x5mm)
? 2014 exar corporation xr32430/xr32431 2 / 13 exar.com/xr32430_xr32431 rev 1a absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any maximum rating condition for extended periods may affect device reliability and lifetime. supply voltage (v cc )...................................-0.3v to +6.0v logic interface voltage (v l )................................v l v cc v+................................................................-0.3v to +7.0v v-.................................................................+0.3v to -7.0v v+ + |v-| ....................................................................13v icc (dc v cc or gnd current).............................100ma junction temperature...............................................125c input voltages txin, online , shutdown ,..........................-0.3v to +6.0v rxin..........................................................................15v output voltage txout.....................................................................13.2v rxout, status .............................................-0.3v to +6.0v short-circuit duration txout.............................................................continuous storage temperature...............................-65c to +150c esd rating rs-232 bus pins hbm - human body model....................................15kv iec614000-4-2 air discharge................................15kv iec614000-4-2 contact discharge..........................8kv operating conditions consumer operating temperature range.....................0c to +70c industrial operating temperature range.....................-40c to +85c v cc supply range........................................... 3.0v to 5.5v v l i/o supply range (v l v cc )..................... 1.65v to 5.5v thermal information (32 ld qfn (5x5mm) ) ? ja .....................................................................30.1(c/w) ? jc .....................................................................10.1(c/w)
? 2014 exar corporation xr32430/xr32431 3 / 13 exar.com/xr32430_xr32431 rev 1a electrical characteristics unless otherwise noted: t a = -40c to +85c, v cc = 3.3v10% or 5.0v10%, v l = v cc symbol parameter conditions min typ max units dc characteristics i cc1 supply current, auto on-line enabled all rxin open, online = gnd, shutdown = v l , v cc = v l = 3.3v, txin = v l or gnd ?1.010a i cc2 supply current, shutdown shutdown = gnd, v cc = v l = 3.3v, txin = v l or gnd ?1.010a i cc3 supply current, auto on-line dis- abled online = shutdown = v l , no load, v cc = v l = 3.3v, txin = v l or gnd ?0.31.0ma logic inputs and outputs - xr32430 v il input low voltage txin, online , shutdown ; 3.0v v cc 5.5v ?0.8v v ih input high voltage ? 2.4 v i il input leakage current txin, online , shutdown ; v in = 0v to v cc ?0.011.0 ? a i ol output leakage current status , rxout (receivers disabled); v out = 0v to v cc ? 0.05 10 ? a v ol output low voltage status , rxout; i out = 1.5ma ? 0.4 v v oh output high voltage status , rxout; i out = -1.5ma ? v cc - 0.6 v logic inputs and outputs - xr32431 v il input low voltage txin, online , shutdown ; 1.65v v l 5.5v & v l v cc ? 1/3 * v l v v ih input high voltage ? 2/3 * v l v i il input leakage current txin, online , shutdown ; v in = 0v to v l ?0.011.0 ? a i ol output leakage current status , rxout (receivers disabled); v out = 0v to v l ? 0.05 10 ? a v ol output low voltage status , rxout; i out = 1.5ma ? 0.4 v v oh output high voltage status , rxout; i out = -1.5ma ? v l - 0.6 v driver outputs v swing output voltage swing all drivers outputs loaded with 3k ? to gnd ? 5.0 5.4 v o r output resistance v cc = v+ = v- = 0v, v out = 2v ? 300 ? i osc output short-circuit current v out = 0v ? 35 60 ma i ol output leakage current v cc = 0v or 3.0v to 5.5v, v out = 12v ? 25 ? a receiver inputs ivr input voltage range ? -15 +15 v v il input low voltage v cc = 3.3v ? 0.6 1.2 v v cc = 5.0v ? 0.8 1.5 v
? 2014 exar corporation xr32430/xr32431 4 / 13 exar.com/xr32430_xr32431 rev 1a * limits applying over the full operating temperature range are denoted by a ? . v ih input high voltage v cc = 3.3v ? 1.5 2.4 v v cc = 5.0v ? 1.8 2.4 v rx hys receiver input hysteresis 0.3 v rx r receiver input resistance ? 3 5 7 k ? auto on-line circuitry characteristics (online = gnd, shutdown = v l , v l = v cc ) rx stsh receiver threshold to status high level ? -2.7 +2.7 v rx stsl receiver threshold to status low level ? -0.3 +0.3 v t stsh receiver threshold to status high figure 11 0.2 ? s t stsl receiver threshold to status low figure 11 30 ? s t online receiver thresholds to drivers enabled figure 11 , (charge pump fully dis- charged when receiver threshold crossed) 30 ? s t offline receiver thresholds to drivers dis- abled figure 11 35 ? s timing characteristics f max max output frequency (speed u) r l = 3k ? , c l = 250pf, 1 driver active, t amb = 0c to 70c ? 1000 kbps max output frequency (speed h) r l = 3k ? , c l = 1000pf, 1 driver active, t amb = 0c to 70c ? 460 kbps max output frequency (speed b) r l = 3k ? , c l = 1000pf, 1 driver active ? 250 kbps t phl receiver propagation delay (high to low) receiver input (<10ns rise/fall) to receiver output, c l = 150pf 0.15 ? s t plh receiver propagation delay (low to high) receiver input (<10ns rise/fall) to receiver output, c l = 150pf 0.15 ? s t rxskew receiver skew |t phl - t plh |50ns t rxoe receiver output enable time normal operation 200 ns t rxod receiver output disable time normal operation 200 ns t txskew driver skew (speeds u and h) |t phl - t plh | (driver propagation delays) ? 30 100 ns driver skew (speed b) |t phl - t plh | (driver propagation delays) ? 100 500 ns tx slew transition-region slew rate speeds u v cc = 3.3v, r l = 3k ?? to 7k ? , c l = 150pf to 250pf, measured from -3.0v to +3.0v or +3.0v to -3.0v 90 v/ ? s transition-region slew rate speed h v cc = 3.3v, r l = 3k ?? to 7k ? , c l = 150pf to 1000pf, measured from -3.0v to +3.0v or +3.0v to -3.0v 90 v/ ? s transition-region slew rate speed b ?6 30 v/ ? s symbol parameter conditions min typ max units
? 2014 exar corporation xr32430/xr32431 5 / 13 exar.com/xr32430_xr32431 rev 1a pin configuration pin assignments xr32340 xr32341 pin name type description 1, 2, 3, 4, 5 1, 2, 3, 4, 5 r1in, r2in, r3in, r4in, r5in inputs (5k ? pull- dwn)- 15kv esd protected, rs-232 receiver inputs 6. 7, 8 6. 7, 8 t1out, t2out, t3out output 15kv esd protected, rs-232 driver output 9,16, 25, 32 9,16, 32 nc - no connect (not connect to the die). can be le ft floating or tied to gnd or v cc . 10, 11, 12 10, 11, 12 t3in, t2in, t1in input ttl/cmos driver input 13,14,15, 17, 18, 19 13,14,15, 17, 18, 19 r5out, r4out, r3out, r2out, r1out, r2out output ttl/cmos receiver output 20 20 status output ttl/cmos level output indicating if no valid rs-232 levels are present at the r1in or r2in input pins. 21 21 shutdown input ttl/cmos level input, when driven low puts the part into shutdown mode (tri-stating driver outputs and disabling the charge- pump); normal operation when driven high. 22 22 online input ttl/cmos level input. a low input enables auto on-line mode, a high input disables auto on-line mode. 23, 28 23, 28 c1-, c1+ analog negative and positive te rminals of voltage doubler charge pump capacitor. 24 24 gnd supply ground -25v l supply i/o power supply 26 26 v cc supply power supply 27 27 v+ analog regulated positive (+5.5v) charge pump rail. 29, 30 29, 30 c2+, c2- analog positive and negative terminals of the inverting charge pump capacitor. 31 31 v- analog regulated positive (-5.5v) charge pump rail. - - paddle supply ground. the exposed paddle on the bottom of package is connected to device ground. the paddle should be connected to ground on pcb. 1 2 3 4 5 9 10 11 17 6 12 18 nc r1in r2in t1out t2out nc nc t2in t1in r5out r1out c1- gnd nc vcc v+ c1+ c2+ c2- vss 25 26 27 29 30 31 32 28 r3in r4in r5in t3out t3in r2out r3out r4out r2out xr32430 32 pin qfn (5x5mm) 1 2 3 4 5 9 10 11 17 6 12 18 nc r1in r2in t1out t2out nc nc t2in t1in r5out r1out c1- gnd vl vcc v+ c1+ c2+ c2- vss 25 26 27 29 30 31 32 28 r3in r4in r5in t3out t3in r2out r3out r4out r2out xr32431 32 pin qfn (5x5mm)
? 2014 exar corporation xr32430/xr32431 6 / 13 exar.com/xr32430_xr32431 rev 1a functional block diagram t3out t2out t2in t3in r2in r2out r2out shutdown online status charge pump c1+ c1- c2+ c2- v+ v- rs-232 outputs rs-232 inputs ttl/cmos inputs ttl/cmos outputs auto on-line / control 5k ? t1out t1in r1in r1out 5k ? r4in r5in r4out r5out 5k ? 5k ? r3in r3out 5k ?
? 2014 exar corporation xr32430/xr32431 7 / 13 exar.com/xr32430_xr32431 rev 1a typical performance characteristics figure 1: transmitter skew vs load capacitance figure 2: transmitter output voltage vs supply voltage figure 3: transmitter output voltage vs load capacitance figure 4: supply current vs load capacitance figure 5: supply current vs supply voltage figure 6: transmitter output voltage vs load capacitance 0 50 100 150 200 0 500 1000 1500 2000 skew (ns) load capacitance (pf) t1 at 1mbps t2/t3 at 31.2kbps all tx loaded with 3k : // c load -6 -4 -2 0 2 4 6 2.5 3 3.5 4 4.5 5 transmitter output voltage (v) supply voltage (v) 1 driver at 1mbps other drivers at 62.5kbps all drivers loaded with 3k : // 250pf -6 -4 -2 0 2 4 6 0 500 1000 1500 2000 transmitter output voltage (v) load capacitance (pf) xr32430eh, supply = 3.3v, t1 at full data rate (1mbps) t2/t3 at 1/16th data rate all drivers loads 3k : // c load 0 10 20 30 40 50 60 70 0 1000 2000 3000 4000 5000 supply current (ma) load capacitance (pf) 1mbps 250kbps 120kbps 20kbps t1 driver at full data rate t2/t3 drivers at 15.5kbps all drivers loaded with 3k : // c load 0 5 10 15 20 25 30 35 40 45 50 2.5 3 3.5 4 4.5 5 supply current (ma) supply voltage (v) 1mbps 500kbps 250kbps t1 at full data rate t2/t3 at 15.5kbps all drivers loaded with 3k : // 1000pf -6 -4 -2 0 2 4 6 0 1000 2000 3000 4000 5000 transmitter output voltage (v) load capacitance (pf) txout+ txout- xr32430eb, supply = 3.3v, t1 driver at 250kbps t2/t3 drivers at 15.5kbps all drivers loads 3k : // c load
? 2014 exar corporation xr32430/xr32431 8 / 13 exar.com/xr32430_xr32431 rev 1a application information general description the xr32430/31 transceiver meets the eia/tia-232 and itu-t v.28/v.24 communication protocols and can be implemented in battery-powered, portable, or hand-held applications such as notebook or laptop computers. the xr32430/31 device features exar's proprietary and pat- ented (u.s. 5,306,954) on-board charge pump circuitry that generates 5.5v rs-232 voltage levels from a single +3.0v to +5.5v power supply. the xr32430/31eu and xr32430/ 31eh devices can operate at a data rate of 1000kbps and 460kbps fully loaded while the xr32430/31eb devices fea- ture slew-rate limited outputs for reduced crosstalk and emi. the xr32430/31 is a 3-driver/5-receiver device, ideal for portable or hand-held applications. the xr32430/31 is an ideal choice for power sensitive designs. the xr32430/31 devices feature auto on- line? circuitry which reduces the power supply drain to a 1a supply current. the xr32430/31 includes one comple- mentary receiver that remains alert to monitor an external devices ring indicator while the xr32430/31 is shutdown. in many portable or hand-held applications, an rs-232 cable can be disconnected or a connected peripheral can be turned off. under these conditions, the internal charge pump and the drivers will be shut down. otherwise, the sys- tem automatically comes on line. this feature allows design engineers to address power saving concerns without major design changes. theory of operation the xr32430/31 series is made up of four basic circuit blocks: 1. drivers 2. receivers 3. the exar proprietary charge pump, and 4. auto on-line? circuitry. drivers the drivers are inverting level transmitters that convert ttl or cmos logic levels to 5.0v eia/tia-232 levels with an inverted sense relative to the input logic levels. typically, the rs-232 output voltage swing is 5.5v with no load and 5v minimum fully loaded. the driver outputs are protected against infinite short-circuits to ground without degradation in reliability. these drivers comply with the eia-tia-232-f and all previous rs-232 versions. unused drivers inputs should be connected to gnd or v cc /v l . the drivers have a minimum data rate of 250kbps (xr32430/31eb), 460kbps (xr32430/31eh) or 1mbps (xr32430/31eu) fully loaded. receivers the receivers convert +5.0v eia/tia-232 levels to ttl or cmos logic output levels. receivers are high-z when the auto on-line? circuitry is enabled and activated or when in shutdown. the truth table logic of the xr32430/31 driver and receiver outputs can be found in table 2 on page 11 . since receiver input is usually from a transmission line where long cable lengths and system interference can degrade the signal, the inputs have a typical hysteresis margin of 300mv. this ensures that the receiver is virtually immune to noisy transmission lines. should an input be left unconnected, an internal 5k pull-down resistor to ground will commit the output of the receiver to a high state. charge pump the charge pump is a exarCpatented design (u.s. 5,306,954) and uses a unique approach compared to older lessCefficient designs. the charge pump still requires four external capacitors, but uses a fourCphase voltage shifting technique to attain symmetrical 5.5v power supplies. the internal power supply consists of a regulated dual charge pump that provides output voltages of 5.5v regardless of the input voltage (v cc ) over the +3.0v to +5.5v range. this is important to maintain comp liant rs-232 levels regardless of power supply fluctuations. the charge pump operates in a discontinuous mode using an internal oscillator. if the ou tput voltages are less than a magnitude of 5.5v, the charge pump is enabled. if the out- put voltages exceed a magnitude of 5.5v, the charge pump is disabled. this oscillator controls the four phases of the voltage shifting. a description of each phase follows. phase 1 v- charge storage during this phase of the clock cycle, the positive side of capacitors c1 and c2 are initially charged to v cc . c1+ is then switched to gnd and the charge in c1C is transferred to c2C. since c2+ is con- nected to v cc , the voltage potential across capacitor c2 is now 2 times v cc .
? 2014 exar corporation xr32430/xr32431 9 / 13 exar.com/xr32430_xr32431 rev 1a figure 7: charge pump - phase 1 phase 2 v- transfer phase two of the clock connects the negative terminal of c2 to the vss st orage capacitor and the posi- tive terminal of c2 to gnd. this transfers a negative gener- ated voltage to c3. this generated voltage is regulated to a minimum voltage of -5.5v. simultaneous with the transfer of the voltage to c3, the positive side of capacitor c1 is switched to v cc and the negative side is connected to gnd. figure 8: charge pump - phase 2 phase 3 v+ charge storage the third phase of the clock is identi- cal to the first phase the charge transferred in c1 pro- duces Cv cc in the negative terminal of c1, which is applied to the negative side of capacitor c2. since c2+ is at v cc , the voltage potential across c2 is 2 times v cc . figure 9: charge pump - phase 3 phase 4 v+ transfer the fourth phase of the clock connects the negative terminal of c2 to gnd, and transfers this positive generated voltage across c2 to c4, the v+ storage capaci- tor. this voltage is regulated to +5.5v. at this voltage, the internal oscillator is disabled. simultaneous with the trans- fer of the voltage to c4, the positive side of capacitor c1 is switched to v cc and the negative side is connected to gnd, allowing the charge pump cycle to begin again. the charge pump cycle will continue as long as th e operational conditions for the internal oscillator are present. figure 10: charge pump - phase 4 since both v+ and vC are separately generated from v cc , in a noCload condition v+ an d vC will be symmetrical. older charge pump approaches that generate vC from v+ will show a decrease in the magnitude of vC compared to v+ due to the inherent inefficiencies in the design. the clock rate for the charge pump typically operates at greater than 250khz. the external capacitors can be as low as 0.1f with a 16v breakdown voltage rating. the exar-patented charge pumps are designed to operate reliably with a range of low cost capacitors. either polarized or non polarized capacitors may be used. if polarized capacitors are used they should be oriented as shown in the typical applications circu it. the v+ capacitor may be connected to either ground or vcc (polarity reversed.) c1 c2 c4 c3 v cc v + storage capacitor v - storage capacitor +v cc -v cc -v cc c1 c2 c4 c3 v cc -5.5v v + storage capacitor v - storage capacitor c1 c2 c4 c3 v cc v + storage capacitor v - storage capacitor +v cc -v cc -v cc c1 c2 c4 c3 v cc +5.5v v + storage capacitor v - storage capacitor
? 2014 exar corporation xr32430/xr32431 10 / 13 exar.com/xr32430_xr32431 rev 1a the charge pump operates with 0.1f capacitors for 3.3v operation. for other supply voltages, see the table for required capacitor values. do not use values smaller than those listed. increasing the capacitor values (e.g., by dou- bling in value) reduces ripple on the transmitter outputs and may slightly reduce power consumption. c2, c3, and c4 can be increased without changing c1s value. for best charge pump efficiency locate the charge pump and bypass capacitors as close as possible to the ic. sur- face mount capacitors are best for this purpose. using capacitors with lower equivale nt series resistance (esr) and self-inductance, along with minimizing parasitic pcb trace inductance will optimize charge pump operation. designers are also advised to consider that capacitor val- ues may shift over time and operating temperature. auto on-line ? circuitry the xr32430/31 devices have a patent pending auto on-line? circuitry on board that saves power in applica- tions such as laptop computers, palmtop (pda) computers and other portable systems. the xr32430/31 devices incorporate an auto on-line? circuit that automatically enables itself when the external transmitters are enabled and the cable is connected. con- versely, the auto on-line? circuit also disables most of the internal circuitry when the device is not being used and goes into a standby mode where the device typically draws 1a. this function is externally controlled by the online pin. when this pin is tied to a logic low, the auto on- line? function is active. once active, the device is enabled until there is no activity on the receiver inputs. the receiver input typically sees at least +3v, which are generated from the transmitters at the other end of the cable with a +5v minimum. when the external transmitters are disabled or the cable is disconnected, the receiver inputs will be pulled down by their internal 5k resistors to ground. when this occurs over a period of time, the internal transmitters will be dis- abled and the device goes into a shutdown or standby mode. when online is high, the auto on-line? mode is disabled. figure 11: auto on-line timing the status pin goes to a logic low when the cable is dis- connected or the external transmitters are disabled. when the xr32430/31 drivers and internal charge pump are disabled, the supply current is reduced to 1a. this can commonly occur in hand-held or portable applications where the rs-232 cable is disconnected or the rs-232 drivers of the connected peripheral are turned off. the auto on-line? mode can be disabled by the shut- down pin. if this pin is a logic low, the auto on-line? function will not operate regard less of the logic state of the online pin. the truth table logic of the xr32430/31 driver and receiver outputs can be found in table 3 on page 11 . the status pin outputs a logic low signal if the no valid rs-232 level is detected at either of the receiver inputs. this pin goes to a logic high when the external transmit- ters are enabled and the cable is connected providing valid rs-232 voltage levels to all the rxin receiver input pins. table 1: minimum recommended charge pump capacitor values supply voltage v cc charge pump capacitor value for xr32430/31 3.0v to 3.6v c1 - c4 = 0.1 ? f 4.5v to 5.5v c1 = 0.047 ? f, c2 - c4 = 0.33 ? f 3.0v to 5.5v c1 - c4 = 0.22 ? f invalid region rs-232 receiver input voltage t stsl t stsh t offline t online rs-232 driver output voltage status +5v -5v charge pump v+ v- v cc 0v
? 2014 exar corporation xr32430/xr32431 11 / 13 exar.com/xr32430_xr32431 rev 1a when the xr32430/31 is shut down, the charge pumps are turned off. v+ charge pump output decays to v cc , the v- output decays to gnd. the decay time will depend on the size of ca pacitors used for the charge pump . once in shutdown, the time required to exit the shut down state and have valid v+ and v- levels is typically 30s. for easy programming, the status can be used to indicate dsr or a ring indicator signal. tying online and shut- down together will bypass the auto on-line? circuitry so this connection acts like a shutdown input pin. table 2: xr32430/31 operation truth table valid rs-232 level at receiver input shutdown online driver outputs receiver outputs status mode of operation yes l x high-z high-z h manually forced shutdown no l x high-z high-z l manually forced shutdown yes h l active active h normal operation (auto on-line ? enabled) no h l high-z active l standby operation due to auto on-line ? circuitry yes h h active active h normal operation no h h active active l normal operation table 3: xr32430/31 driver and receiver truth table shutdown rxin rxout txin txout l x high-z x high-z hlhlh hhlhl
? 2014 exar corporation xr32430/xr32431 12 / 13 exar.com/xr32430_xr32431 rev 1a mechanical dimensions 32-pin qfn (5x5mm) ? ?
? 2014 exar corporation xr32430/xr32431 13 / 13 exar.com/xr32430_xr32431 rev 1a for further assistance: email: serialtechsupport@exar.com exar technical documentation: http://www.exar.com/techdoc/ exar corporation headquarters and sales offices 48720 kato road tel: +1 (510) 668-7000 fremont, ca 95438 - usa fax: +1 (510) 668-7001 notice exar corporation reserves the right to make changes to the produc ts contained in this publication in order to improve design, p erformance 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 herein are only for illustration purposes and may vary depending upon a users specific application. while the information in this publication has been carefully checked; no re sponsibility, however, is assumed for inaccuracies. exar corporation does not recommend the use of any of its product s in life support applications where the failure or malfunctio n of the product can reasonably be expected to cause failure of the life support system or to significantly af fect its safety or effectiveness. products are not authorized fo r 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 as sumes all such risks; (c) potential liability of exar cor- poration is adequately protected under the circumstances. reproduction, in part or whole, without the prior written consent of exar corporation is prohibited. ordering information revision history part number speed package green operating temperature range shipping packaging marking xr32430ebcr-f 250kbps 32-pin qfn yes 0c to +70c tray 32430ebcr xr32430ebcr-f/tr 250kbps 32-pin qfn yes 0c to +70c tape and reel 32430ebcr xr32430eber-f 250kbps 32-pin qfn yes -40c to +85c tray 32430eber xr32430eber-f/tr 250kbps 32-pin qfn yes -40c to +85c tape and reel 32430eber xr32430ehcr-f 460kbps 32-pin qfn yes 0c to +70c tray 32430ehcr xr32430ehcr-f/tr 460kbps 32-pin qfn yes 0c to +70c tape and reel 32430ehcr xr32430eucr-f 1mbps 32-pin qfn yes 0c to +70c tray 32430eucr xr32430eucr-f/tr 1mbps 32-pin qfn yes 0c to +70c tape and reel 32430eucr xr32431ebcr-f 250kbps 32-pin qfn yes 0c to +70c tray 32431ebcr xr32431ebcr-f/tr 250kbps 32-pin qfn yes 0c to +70c tape and reel 32431ebcr xr32431eber-f 250kbps 32-pin qfn yes -40c to +85c tray 32431eber xr32431eber-f/tr 250kbps 32-pin qfn yes -40c to +85c tape and reel 32431eber xr32431ehcr-f 460kbps 32-pin qfn yes 0c to +70c tray 32431ehcr xr32431ehcr-f/tr 460kbps 32-pin qfn yes 0c to +70c tape and reel 32431ehcr xr32431eucr-f 1mbps 32-pin qfn yes 0c to +70c tray 32431eucr xr32431eucr-f/tr 1mbps 32-pin qfn yes 0c to +70c tape and reel 32431eucr revision date description 1a september 2014 initial release of datasheet. ecn 1441-01 oct 2014

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