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1 rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation the sp3244e/3245e is a 3-driver/5-receiver device ideal for mobile phone, consumer and pda applications. these devices use an internal high-ef?ciency, charge-pump power supply that requires only 0.1f capacitors for 3.3v single-supply operation. this charge pump and sipexs driver archi - tecture allow the sp3244e/3245e to deliver compliant rs-232 performance from a power supply ranging from +3.0v to +5.5v. at voltages between +2.7v and +3.0v the driver outputs are compliant with rs-562 and can interface to rs-232 in portable applications. the auto on-line ? plus feature allows the device to automatically enter a low power shutdown mode if all receiver and driver inputs have been idle for 30 seconds. the device will wake-up from this automatic shutdown state upon detecting activity. this power saving feature functions without system intervention or modi?cations to software or drivers. sp3244e supports serial data rates of 250kbps minimum under full load and while maintaining slew rates of less than 30v/s. sp3245e is capable of high speed communication of up to 1mbps. description features applications ? portable rs-232 ? laptops and handheld pcs and pda ? cellular telephones, datacables, chargingcradles ? diagnostic/upload ports on embedded applications ? use in conjunction with low-voltage uart or microcontroller ? sp3244e is cross-compatible with max3244e, icl3244e ? sp3245e is cross-compatible with max3245e, icl3245e sp3244e-sp3245e 3.0v to 5.5v rs-232 transceivers with auto on-line? plus ? contains 3-drivers and 5-receivers; single-chip dte (pc or terminal) serial port transceiver ? auto on-line ? plus ? sp3244e slew-controlled to 250kbps under load ? sp3245e 1mbps data rate for high-speed rs-232 ? meets true eia/tia-232-f and itu v.28 standards from a +3.0v to +5.5v power supply ? adheres to eia/tia-562 for interoperability with eia/tia-232 down to a +2.7v supply voltage ? regulated charge pump yields stable rs-232 outputs regardless of v cc variations ? esd speci?cations: 15kv human body model 15kv iec1000-4-2 air discharge 8kv iec1000-4-2 contact discharge sp3244e sp3245e 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 c2+ c2- v- r 1 in r 2 in r 3 in r 4 in r 5 in t 1 out t 2 out t 3 out t 3 in t 2 in t 1 in c1+ v+ v cc gnd c1- online shutdow n status r 2 out r 1 out r 2 out r 3 out r 4 out r 5 out
rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation 2 pin assignments name function pin number (t)ssop qfn c2+ positive terminal of the inverting charge pump capacitor. 1 29 c2- negative terminal of the inverting charge pump capacitor. 2 30 v- regulated -5.5v output generated by the charge pump. 3 31 r1in rs-232 receiver input. 4 1 r2in rs-232 receiver input. 5 2 r3in rs-232 receiver input. 6 3 r4in rs-232 receiver input. 7 4 r5in rs-232 receiver input. 8 5 t1out rs-232 driver output. 9 6 t2out rs-232 driver output. 10 7 t3out rs-232 driver output. 11 8 t3in ttl/cmos driver input. 12 10 t2in ttl/cmos driver input. 13 11 t1in ttl/cmos driver input. 14 12 r5out ttl/cmos receiver output. 15 13 r4out ttl/cmos receiver output. 16 14 r3out ttl/cmos receiver output. 17 15 r2out ttl/cmos receiver output. 18 17 r1out ttl/cmos receiver output. 19 18 r2out non-inverting receiver 2 output; active in shutdown. 20 19 status status output. 21 20 shutdown forced shutdown input. drive low to shut down drivers, receivers and charge pump. will override auto on-line ? plus . do not leave this pin open. 22 21 online auto on-line ? input. active low enabled automatic power saving feature. equivalent to competitor's forceon pin. do not leave this pin open. 23 22 c1- negative terminal of the voltage doubler charge pump capacitor. 24 23 gnd ground connection. 25 24 vcc device power supply pin (3.0v to 5.5v). 26 26 v+ regulated +5.5v output generated by the charge pump. 27 27 c1+ positive terminal of the voltage doubler charge pump capacitor. 28 28
3 rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation absolute maximum ratings supply voltage (vcc).......................-0.3v to + 6.0v v+ (note 1)......................................-0.3v to + 7.0v v- (note 1).......................................+0.3v to - 7.0v |v+| + |v-| .......................................................+13v input voltage at ttl input pin.. -0.3v tov cc +0.3v rxin..............................................................+/-18v driver output (from ground)...................... +/-13.2v rxout, status .....................-0.3v to v cc + 0.3v short circuit duration, txout to gnd, continuous (one output at a time maximum) storage temperature.....................-65c to +150c operating temperature sp324xecx................0c to +70c operating temperature sp324xeex...........-40c to +85c lead temperature (soldering, 10s)..............+300c ssop-28, ? ja = 67.1oc/w tssop-28, ? ja = 83.6oc/w qfn- 32, ? ja= 22.4oc/w these are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the opera - tion sections of the speci?cations below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. note 1: v+ and v- can have maximum magnitudes of 7v, but their absolute difference cannot exceed 13v. electrical characteristics pin assignments unless otherwise noted v cc = +3.0v to +5.5v, t amb = t min to t max , c1Cc4 = 0.1f. typical values are at t amb = +25c, v cc = 3.3v. parameters symb test conditions min. typ. max. unit dc characteristics supply current, auto on-line ? plus i cc 3 receivers idle, txin = vcc or gnd, online = gnd, shutdown = vcc note 1 1 10 a supply current, shutdown i cc 2 shutdown = gnd 1 10 a supply current, active i cc 1 online = shutdown = vcc, no load 1 5 ma driver input and logic input pins: logic input voltage high v ih vcc = 3.3v 2 v vcc = 5.0v 2.4 low v il 0.8 logic threshold v t 1.5 logic input leakage current i il 0.01 1.0 a logic input hysteresis v hys 100 mv receiver outputs and status output receiver output voltage low v ol i out = -1.6ma 0.4 v receiver output voltage high v oh i out = 1ma v cc -0.6 v receiver output leakage current i oz receivers disabled. 0.4v < v o < 5.5v 0.02 1 a note 1: characterized, not 100% tested.
rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation 4 electrical characteristics parameters symb test conditions min. typ. max. unit receiver inputs input voltage range -15 +15 v input threshold low v cc = 3.3v 0.6 1.0 v v cc = 5.0v 0.8 1.2 input threshold high v cc = 3.3v 1.2 2.4 v v cc = 5.0v 1.7 2.4 v input hysteresis 200 mv input resistance t a = 25oc 3 4.5 7 k? driver outputs output voltage swing v o all transmitter outputs loaded with 3k? to gnd 5.0 5.6 v output load = open circuit 15.0 short circuit current vout = 0v 60 ma power-off impedance v cc = v+ = v- = 0, transmitter outputs = 2v 300 10m ? output leakage current v cc = 0 or 3v to 3.3v, v out = 12v, drivers disabled 25 a mouse drivability t1in = t2in = gnd, t3in = v cc , t3 loaded with 3k? to gnd, t1out and t2out loaded with 2.5ma each 5.0 v esd protection iec 1000-4-2 air discharge 15 esd protection for rxin, txout pins iec 1000-4-2 contact discharge 8 kv human body model 15 all other pins human body model 2 kv auto on-line ? plus ( online = gnd, shutdown = vcc) rx input threshold to status output high 2.7 v rx input threshold to status output low 0.3 v threshold to status high t sth 0.4 s threshold to status low t stl 30 s rx or tx transition to drivers enabled t online 100 s last rx or tx transition to driv - ers disabled t offline note 1 15 30 60 sec note 1: characterized, not 100% tested. unless otherwise noted v cc = +3.0v to +5.5v, t amb = t min to t max , c1Cc4 = 0.1f. typical values are at t amb = +25c, v cc = 3.3v.
5 rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation timing characteristics unless otherwise noted v cc = +3.0v to +5.5v, t amb = t min to t max , c1Cc4 = 0.1f. typical values are at t amb = +25c, v cc = 3.3v. parameters symbol test conditions min. typ. max. unit sp3244e maximum data rate r l = 3k?, c l = 1000pf. one transmitter switching. 250 kbps driver propagation delay t dphl , t dplh c l =1000 p f 1600 ns transition-region slew rate r l =3k? to 7k?, c l =150pf to 1000pf, measurements taken from +3v to -3v or from -3v to +3v. 4 30 v/s driver skew |t dphl - t dplh | at zero crossing 50 ns receiver propagation delay t rphl ,t rplh r in to r out , c l = 150pf 0.15 s receiver output enable time t rzh , t rzl 0.04 2.0 s receiver output disable time t rzh , t rlz 0.1 2.0 s receiver skew |t phl - t plh | at 1.5v 40 ns sp3245e maximum data rate r l = 3k?, c l = 250pf. one transmitter switching. 1000 kbps r l = 3k?, c l = 1000pf. one transmitter switching. 500 kbps driver propagation delay t dphl , t dplh c l =250 p f 700 ns transition-region slew rate r l =3k? to 7k?, c l =150pf to 250pf, measurements taken from +3v to -3v or from -3v to +3v. 24 150 v/s driver skew |t dhpl - t dplh | at zero crossing 100 ns receiver propagation delay t rphl ,t rplh r in to r out , c l = 150pf 0.15 s receiver output enable time t rzh , t rzl 0.05 2.0 s receiver output disable time t rzh , t rlz 0.1 2.0 s receiver skew |t phl - t plh | at 1.5v 90 ns
rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation 6 0 50 100 150 200 250 300 350 400 0 250 500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500 load capacitance (pf) skew (ns) 3244, 250kbps 3245, 1mbps typical performance characteristics turn on time vs. temperature i cc vs. load capacitance transmitter output vs. load capacitance transmitter input to receiver output propaga - tion delay vs. load capacitance transmitter output slew rate vs. load capaci - tance transmitter skew vs. load capacitance 0 5 10 15 20 25 30 35 40 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 load capacitiance (pf) supply current (ma) 250kbps 1mbps 0 0.5 1 1.5 2 2.5 3 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 load capacitiance (pf) tin to rout propagation delay (us) 0 5 10 15 20 25 30 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 load capacitiance (pf) transmitter output slew rate (v/us) -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 load capacitiance (pf) transmitter output voltage (v) v- v+ 100 150 200 250 300 350 400 -55 -30 -5 20 45 70 95 temperature (oc) charge pump turn-on time (us) supply current (ma) transmitter output voltage (v) t in to r out propagation delay (s) charge pump turn-on time (s) transmitter output slew rate (v/s) skew (ns)
7 rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation typical performance characteristics sp3244e charge pump waveforms for 250kbps clock rate sp3244e charge pump levels out of shut - down sp3244e charge pump levels into shut - down sp3244e c2+ charge pump waveforms - vcc=3.3v, all channels switching sp3244e charge pump power on timevcc=3.3v, t=27c sp3244e c2+ charge pump waveforms - vcc=5.0v, all channels switching
rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation 8 typical performance characteristics sp3244e charge pump power on time - vcc=3.3v, t=-40c sp3244e waveforms for 250kpbs clock rate rl=3k? cl=4700pf sp3244e charge pump power on time - vcc=3.3v, t=85oc sp3244e waveforms for 250kpbs clock rate rl=3k? cl=1000pf sp3245e waveforms for 1mbps clock rate rl=3k? cl=1000pf sp3245e waveforms for 1mbps clock rate rl=3k? cl=50pf
9 rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation sp2345 waveforms for 1mbps clock rate - rl=3k, cl=250pf typical performance characteristics
rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation 10 description the sp3244e and sp3245e are 3-driver/5-re - ceiver devices ideal for serial ports in battery- powered, portable, or handheld applications such as notebook or handheld computers. sp3244e/3245e transceivers meet the eia/ tia-232 and itu-t v.28/v.24 communication protocols for reliable serial communication. the sp3244e/3245e devices feature sipexs proprietary and patented (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 sp3244e/3245e is an ideal choice for power sensitive designs. with the auto on-line ? plus enabled the sp3244e/3245e reduces power consumption to a 1a supply current whenever the transceivers are idle. in shutdown, the internal charge pump and the drivers will shut down. receivers remain active unless the device is put into manual shutdown using the shutdown pin. this feature allows design engineers to address power saving concerns without major design changes. theory of operation the sp3244e/3245e is made up of four basic circuit blocks: 1. drivers, 2. receivers, 3. the sipex propri - etary charge pump, and 4. auto on-line ? plus 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 +5.4v with no load and +5v minimum fully loaded. the driver outputs are protected against in?nite short circuits to ground without degradation in reliability. these drivers comply with the eia/tia-232-f and all previous rs-232 versions. unused driver inputs should be connected to gnd or vcc. the sp3244e/3245e devices operate at this typical data rate when fully loaded. the drivers can guarantee output data rates fully loaded with 3k? in parallel with 1000pf (sp3244e), or 250pf (sp3245e) ensuring compatibility with popular pc-to-pc communication software. the slew rate of the driver output on the sp3244e is internally limited to a maximum of 30v/s in order to meet the eia standards (eia rs-232d 2.1.7, paragraph 5). the slew rate of sp3245e is not limited to enable higher speed data transfers. the transition of the loaded output from high to low also meets the monotonic signal transition requirements of the standard. receivers the receivers convert eia/tia-232 signal levels to ttl or cmos logic output levels. re - ceivers remain active unless the device is put into manual shutdown using the shutdown pin. the non-inverted output of receiver 2 ( r2out ) will continue to be active in all modes, including shutdown. since receiver input is usually from a transmis - sion line where long cable lengths and system interference can degrade the signal, the inputs have a typical hysteresis margin of 500mv. this ensures that the receiver is virtually im - mune 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. highly ef?cient charge pump the charge pump is used to generate positive and negative signal voltages for the rs-232 drivers. this enables fully compliant rs-232 and v.28 signals from a single 3.0 or 5.5v power supply. the charge pumps use four external capaci - tors to hold and transfer electrical charge. the sipex patented design (us patent #5,306,954) uses a unique approach compared to older less ef?cient designs. the pumps use a fourCphase voltage shifting technique to attain symmetrical v+ and v- power supplies. an intelligent control oscillator regulates the operation of the charge pump to maintain the proper voltages at maxi - mum ef?ciency. phase 1 vss charge store and double. the positive terminals of capacitors c1 and c2 are charged from vcc with their negative terminals initially connected to ground. c1+ is then connected to ground and the stored charge from c1C is superimposed onto c2C . since c2+ is still connected to vcc the voltage potential across capacitor c2 is now 2 x v cc .
11 rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation description c 2 + - v cc c 3 c 4 c 1 + + + e - e - phases 1 and 3: store/double. double charge from c1 onto c2. c2 is now charged to -2xvcc + c 2 + - v cc c 3 c 4 c 1 + + + e - + e + e + c 2 + - v cc c 3 c 4 c 1 + + + phase 2 C vss transfer from c2 to c4. meanwhile c1 is charged to vcc e - e - e - + vss transfer from c2 to c3. meanwhile c1 is charged to vcc v dd v- v+ v- v+ v+ patented 5,306,954 (sipex, inc.) phase 4 v dd charge pump phases minimum recommended charge pump capacitor values input voltage v cc charge pump capacitor value for sp32xx 3.0v to 3.6v c1-c4=0.1f 4.5v to 5.5v c1=0.047f, c2-c4=0.33f 3.0v to 5.5v c1-c4=0.22f charge pump capacitor v alues
rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation 12 description surface mount ceramic capacitors (such as are widely used for power-supply decoupling) are ideal for use on the charge pump. the charge pumps are designed to be able to function prop - erly with a wide range of capacitor styles and val - ues. if polarized capacitors are used the positive and negative terminals should be connected as shown on the typical operating circuit. capacitance values may be increased if operat - ing at higher v cc or to provide greater stability as the capacitors age. see charge pump capacitor value table on page 11. auto on-line ? plus circuitry the sp3244e/3245e devices have the advanced auto on-line ? plus feature that saves power by turning off the charge pumps and driver outputs when the transceiver inputs are idle for more than 30 seconds. rs-232 signals use both positive and negative voltages of greater than 5v magnitude. receiv - ers have nominal 5k? impedance to ground. even when idle, drivers will maintain output signal voltage creating a continuous current ?ow. in low power battery operated devices this constant current drain can decrease battery life signi?cantly. phase 2 vss transfer and invert: phase two connects the negative terminal of c2 to the vss stor - age capacitor and the positive terminal of c2 to ground. this transfers the doubled and inverted (vC) voltage onto c4. meanwhile, capacitor c1 charged from vcc to prepare it for its next phase. phase 3 v dd charge store and double: phase three is identical to the ?rst phase. the positive ter - minals of capacitors c1 and c2 are charged from v cc with their negative terminals initially connected to ground. c1+ is then connected to ground and the stored charge from c1C is superimposed onto c2C. since c2+ is still connected to v cc the voltage potential across capacitor c2 is now 2 x v cc . phase 4 v dd transfer: the fourth phase connects the negative terminal of c2 to ground and the posi - tive terminal of c2 to the v dd storage capacitor. this transfers the doubled (v+) voltage onto c3. meanwhile, capacitor c1 charged from v cc to prepare it for its next phase. the sipex chargepump generates v+ and vC independently from v cc . hence in a noCload condition v+ and v- will be symmetrical. older charge pump approaches generate v+ and then use part of that stored charge to generate v-. because of inherent losses the magnitude of v- will be smaller than v+ on these older designs. under lightly loaded conditions the intelligent pump oscillator maximizes ef?ciency by running only as needed to maintain v+ and vC. since interface transceivers often spend much of their time at idle this power-ef?cient innovation can greatly reduce total power consumption. this improvement is made possible by the indepen - dent phase sequence of the sipex charge-pump design. the clock rate for the charge pump typically op - erates at greater than 70khz allowing the pump to run ef?ciently with small 0.1f capacitors. ef?cient operation depends on rapidly charging and discharging c1 and c2, therefore capacitors should be mounted close to the ic and have low esr (equivalent series resistance). inexpensive fig u re 0 r e c ei v er 5 k? c u r r ent pat h to g round r e c e i v e r 5 k ? reciever 5k? current path to gnd auto on-line ? plus devices may be con?gured to emulate the behavior of devices with our earlier auto on-line ? feature. auto on-line ? plus puts the device into a low power mode when driver and receiver inputs are idle and re- awakes upon detecting signal transitions. auto on-line ? puts the device into a low power mode when receiver inputs are left ?oating and re- awakes when receivers are driven greater than 2.7v magnitude by incoming rs-232 signal.
13 rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation description 15kv esd protection esd-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. the driver output and receiver inputs of the sp3244e/3245e have extra protection against static electricity. sipex uses state-of- the-art structures to protect these pins against esd of 15kv without damage. the esd struc - tures withstand high esd in all states: normal operation, shutdown, and powered down. after an esd event, the sp3244e/3245e keep work - ing without latch-up or damage. esd protection can be tested in various ways. the transmitter outputs and receiver inputs of the sp3244e/3245e are characterized for protection to the following limits: ? 15kv using the human body model ? 8kv using the contact discharge method speci?ed in iec 1000-4-2 ? 15kv using the air-gap discharge method speci?ed in iec 1000-4-2 auto on-line ? plus provides greater power savings in typical operation because the trans - ceiver will go into low power standby mode unless a communication link is in use. signals such as cts, rts, dtr, dsr, or ri will typi - cally change signal-state to establish hand - shaking before any actual data-communication takes place. transitions on these handshake signals will wake up the auto on-line ? plus transceiver to prepare it for sending data (t online 100s typical). receivers remain active to detect incoming signals in auto on-line ? plus standby mode. receiver outputs may be disabled by enter - ing manual shutdown by driving shutdown pin to logic 0. a special non-inverted receiver output r2out remains active in all modes, including shutdown pin at logic 0. in some applications if there is a signi?cant delay (greater than t offline ) between the handshaking transitions and the start of data communication the transceiver may enter auto on-line ? plus standby mode before data communication begins. the t offline interval is at least 15 seconds and no longer than 60 seconds. in applications where the transceiver needs to remain active anytime it is connected to live rs-232 signals, even if those signals remain idle for longer than t offline , then the status output may be used to drive the online pin. the status output pin functions the same in both auto on-line ? and auto on-line ? plus de - vices. status will output logic 1 if any of the receiver inputs are driven greater than 2.7v magnitude by incoming rs-232 signals and drives logic 0 if receiver inputs are ?oating or driven to ground. driving the online pin with the status output disables auto on-line ? plus (forced on-line) whenever rs-232 voltages are seen on any receiver inputs. if no rs-232 voltages are seen on the receiver inputs the auto on-line ? plus transceiver will still activate its charge pump and driver outputs when the driver inputs are active. this allows the trans - ceiver to signal a remote auto on-line ? or auto on-line ? plus, on the other end of the data cable, to wake up. the status output pin remains active in all modes, including shutdown pin at logic 0. connecting status output to drive both online and shutdown will wake the trans - ceiver if any receiver inputs are driven greater than 2.7v magnitude and put the transceiver into forced shutdown mode if all receiver inputs are ?oating or driven to ground.
rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation 14 esd test conditions esd performance depends on a variety of conditions. contact sipex for a reliability report that documents test setup, methodology and results. iec 1000-4-2 the iec 1000-4-2 standard covers esd testing and performance of ?nished equip - ment. however, it does not speci?cally refer to integrated circuits. the sp3244e/3245e helps you design equipment to meet iec 1000-4-2, without sacri?cing boardspace and cost for external esd-protection components. the major difference between tests done using the human body model and iec 1000-4-2 is a higher peak current in iec 1000-4-2. description auto on-line? plus truth table series resistance is lower in the iec 1000-4-2 model. hence, the esd withstand voltage mea - sured to iec 1000-4-2 is generally lower than that measured using the human body model. the air-gap test involves approaching the device with a charged probe. the contact discharge method connects the probe to the device before the probe is energized. machine model the machine model for esd tests all pins using a 200pf storage capacitor and zero discharge resistance. the objective is to emulate the stress caused when i/o pins are contacted by handling equipment during test and assembly. device pin tested human body model iec1000-4-2 air discharge contact discharge level txout 15kv 15kv 8kv 4 rxin 15kv 15kv 8kv 4 txin, rxout, online , shutdown , status 2kv 2kv 2kv 1 operating mode online shutdown |rxin| > 2.7 v idle inputs (rxin & txin) txout rxout r2out forced shutdown x 0 x x high-z high-z active forced online 1 1 x x active active active auto on-line ? plus (wake when active) 0 1 x active active active active auto on-line ? plus (off-line when idle) 0 1 x idle > 30s high-z active active auto on-line ? plus (wake on cable) status 1 yes x active active active auto on-line ? plus (wake when active) status 1 no active active active active auto on-line ? plus (off-line when idle) status 1 no idle > 30s high-z active active auto on-line ? (wake on cable) status status yes x active active active auto on-line ? (auto shutoff) status status no x high-z active active esd table
15 rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation description indeterminate indeterminate invalid level: st a tus = 0 va lid rs232 level: st a tus = 1 va lid rs232 level: st a tus = 1 0.3v 2.7v -0.3v -2.7v receiver positive and negative threshold versus status output signal 30 second timer edge detect t_in edge detect r_in r s shutdown idle online shutdown online low-power shutdown idle shutdown online low-power shutdown idle auto on-line ? plus logic status output logic shutdown logic 30 second timer edge detect t_in edge detect r_in r s shutdown idle online shutdown online low-power shutdown idle
rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation 16 auto on-line ? plus receiver inputs invalid region } transmitter inputs transmitter outputs status output output vcc 0 vcc 0 v+ vcc 0 v- t tstl t sth t offline t online t offline t online auto on-line ? plus timing diagram t stl (=30 s typ.) t sth (=0.4 s typ.) t offline (=30 s typ.) t online (=100 s typ.)
17 rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation typical operating circuit sp3244e/45e v cc c1+ 26 v cc 28 + c5 0.1f c1 0.1f 0.1f c2 + + 24 c1- 1 c2+ 2 c2- 14 t 1 in t 2 in t 3 in t 1 out t 2 out t 3 out 13 12 ttl/cmo s inputs 20 r 2 out r 1 out r 2 out 19 18 r 3 out r 4 out r 5 out 17 16 15 ttl/cmos outputs v cc 22 23 21 to p supervisor circuit shutdow n online status gnd 25 5k? 5k? 5k? 5k? 5k? r 5 in r 4 in r 3 in r 2 in r 1 in v+ v- 27 3 9 10 11 4 5 6 7 8 rs-232 inputs rs-232 outputs c3 c4 0.1f 0.1f + + online control auto on-line ? plus
rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation 18 package pinout sp3244e sp3245e 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 c2+ c2- v- r 1 in r 2 in r 3 in r 4 in r 5 in t 1 out t 2 out t 3 out t 3 in t 2 in t 1 in c1+ v+ v cc gnd c1- online shutdow n status r 2 out r 1 out r 2 out r 3 out r 4 out r 5 out 1 8 7 6 5 4 3 2 32 25 26 27 28 29 30 31 24 17 18 19 20 21 22 23 9 16 15 14 13 12 11 10 r1 in t1 out r4 in r3 in r2 in r5 in t3 out t2 out nc nc t3 in t1 in t2 in r3 out r4 out r5 out gnd r2 out c1- onlin e shutdown st a tus r2 out r1 out nc nc v cc v+ c1+ c2+ c2- v- sp3244/sp3245 qfn-32 to p view
19 rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation 28 pin tssop
rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation 20 28 pin ssop
21 rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation 32 pin qfn
rev m 10/9/06 sp3244e-sp3245e, 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus ? copyright 2006 sipex corporation 22 solved by sipex tm sipex corporation headquarters and sales of?ce 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liability arising out of the applica - tion or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. part number temperature range package type sp3244eca-l from 0o to +70oc 28 pin ssop sp3244ecy-l from 0o to +70oc 28 pin tssop sp3244eea-l from -40o to +85oc 28 pin ssop sp3244eey-l from -40o to +85oc 28 pin tssop SP3244EER1-L from -40o to +85oc 32 pin qfn sp3245eca-l from 0o to +70oc 28 pin ssop sp3245ecy-l from 0o to +70oc 28 pin tssop sp3245eea-l from -40o to +85oc 28 pin ssop sp3245eey-l from -40o to +85oc 28 pin tssop sp3245eer1-l from -40o to +85oc 32 pin qfn available in tape and reel. to order add "/tr" suf?x to part number, example: sp3244eca-l= standard: sp3244eca-l/tr =tape and reel available in lead free packaging. ordering information

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