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exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 SP3223E/eb/eu intelligent +3.0v to +5.5v rs-232 transceivers features ? meets true eia/tia-232-f standards from a +3.0v to +5.5v power supply ? interoperable with eia/tia-232 and adheres to eia/tia-562 down to a +2.7v power source ? auto on-line ? circuitry automatically wakes up from a a shutdown ? minimum 250kbps data rate under load (eb) ? mbps data rate for high speed rs-232 (eu) ? regulated charge pump yields stable rs-232 outputs regardless of v cc variations ? esd specifcations: + 5kv human body model + 5kv iec6 000-4-2 air discharge + 8kv iec6000-4-2 contact discharge description selection table now available in lead free packaging v- 1 2 3 4 17 18 19 20 5 6 7 16 15 14 shutdown c1+ v+ c1- c2+ c2- online en r 1 in gnd vcc t 1 out status 8 9 10 11 12 13 r 2 in r 2 out SP3223E t 2 out t 1 in t 2 in r 1 out the sp3223 products are rs-232 transceiver solutions intended for portable applications such as notebook and hand held computers. these products use an internal high-effciency, charge-pump power supply that requires only 0. f capacitors in 3.3v operation. this charge pump and exar's driver architecture allow the sp3223 series to deliver compliant rs-232 performance from a single power supply ranging from +3.3v to +5.0v. the sp3223 is a 2- driver/2-receiver device ideal for laptop/notebook computer and pda applications. the auto on-line ? feature allows the device to automatically "wake-up" during a shut - down state when an rs-232 cable is connected and a connected peripheral is turned on. otherwise, the device automatically shuts itself down drawing less than a. device power supplies rs- 232 drivers rs-232 receivers auto on-line ? ttl 3-state data rate (kbps) SP3223E +3.0v to +5.5v 2 2 yes yes 20 SP3223Eb +3.0v to +5.5v 2 2 yes yes 250 SP3223Eu +3.0v to +5.5v 2 2 yes yes 000
exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 2 absolute maximum ratings these are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifcations below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability and cause permanent damage to the device. v cc .......................................................-0.3v to +6.0v v+ (note ).......................................-0.3v to +7.0v v- (note )........................................+0.3v to -7.0v v+ + |v-| (note )...........................................+3v i cc (dc v cc or gnd current)......................... + 00ma input voltages txin, online, shutdown, en......................-0.3v to v cc + 0.3v rxin................................................................... + 5v output voltages txout............................................................. + 3.2v rxout, status.......................-0.3v to (v cc + 0.3v) short-circuit duration txout.....................................................continuous storage temperature......................-65c to + 50c power dissipation per package 20-pin ssop (derate 9.25mw/ o c above +70 o c)..750mw 20-pin tssop (derate .mw/ o c above +70 o c..900mw note 1: v+ and v- can have maximum magnitudes of 7v, but their absolute difference cannot exceed 3v. unless otherwise noted, the following specifcations apply for v cc = +3.0v to +5.5v with t amb = t min to t max . typical values apply at v cc = +3.3v or +5.0v and t amb = 25 c ( note 2) . electrical characteristics note 2 : c1 - c4 = 0.1f, tested at 3.3v 10%. c1 = 0.047f, c2-c4 = 0.33f, tested at 5v10%. parameter min. typ. max. units conditions dc characteristics supply current, auto on-line? .0 0 a all rxin open, online = gnd, shutdown = vcc, txin = vcc or gnd, vcc = +3.3v, t amb = +25oc supply current, shutdown .0 0 a shutdown = gnd, txin = vcc or gnd, vcc = +3.3v, t amb = +25oc supply current, auto on-line? disabled 0.3 .0 ma online = shutdown = vcc, no load, vcc = +3.3v, t amb = +25oc logic inputs and receiver outputs input logic threshold low high gnd 2.0 0.8 vcc v vcc = 3.3v or 5.0v, txin, en, shutdown, online input leakage current +/-0.0 +/-.0 a txin, en, online, shutdown, t amb = +25oc, vin = 0v to vcc output leakage current +/-0.05 +/-0 a receivers disabled, vout = 0v to vcc output voltage low 0.4 v i out = .6ma output voltage high vcc - 0.6 vcc - 0. v i out = -.0ma
3 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 unless otherwise noted, the following specifcations apply for v cc = +3.0v to +5.5v with t amb = t min to t max . typical values apply at v cc = +3.3v or +5.0v and t amb = 25 c ( note 2) . electrical characteristics note 2 : c1 - c4 = 0.1f, tested at 3.3v 10%. c1 = 0.047f, c2-c4 = 0.33f, tested at 5v10%. parameter min. typ. max. units conditions driver outputs output voltage swing +/-5.0 +/-5.4 v all driver outputs loaded with 3k? to gnd, t amb = +25oc output resistance 300 ? vcc = v+ = v- = 0v, vout = +/-2v output short-circuit current +/-35 +/-60 ma vout = 0v output leakage current +/-25 a vcc = 0v or 3.0v to 5.5v, vout = +/- 2v, driver disabled receiver inputs input voltage range -5 +5 v input threshold low 0.6 .2 v vcc = 3.3v input threshold low 0.8 .5 v vcc = 5.0v input threshold high .5 2.4 v vcc = 3.3v input threshold high .8 2.4 v vcc = 5.0v input hysteresis 0.3 v input resistance 3 5 7 k ? auto on-line? circuitry characteristics (online = gnd, shutdown = vcc) status output voltage low 0.4 v i out = .6ma status output voltage high vcc - 0.6 v i out = -.0ma receiver threshold to drivers enabled (t online ) 200 s figure 5 receiver positive or negative threshold to status high (t stsh ) 0.5 s figure 5 receiver positive or negative threshold to status low (t stsl ) 20 s figure 5
exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 4 unless otherwise noted, the following specifcations apply for v cc = +3.0v to +5.5v with t amb = t min to t max . typical values apply at v cc = +3.3v or +5.0v and t amb = 25 c. timing characteristics parameter min. typ. max. units conditions maximum data rate SP3223E 20 235 kbps rl = 3k?, c l = 000pf, one driver active SP3223Eb 250 SP3223Eu 000 rl = 3k?, c l = 250pf, one driver active receiver propagation delay t phl and t plh 0.5 a receiver input to receiver output, c l = 50pf receiver output enable time 200 ns normal operation receiver output disable time 200 ns normal operation driver skew e, eb 00 500 ns t phl - t plh , t amb = 25 c eu 50 00 ns receiver skew e, eb, eu 200 000 ns t phl - t plh transition-region slew rate e, eb 30 v/s vcc = 3.3v, rl = 3k?, t amb = 25 c, measurements taken from -3.0v to +3.0v or +3.0v to -3.0v eu 90
5 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 figure . SP3223E typical operating circuit typical operating circuit
exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 6 unless otherwise noted, the following performance characteristics apply for v cc = +3.3v, 250kbps data rate, all drivers loaded with 3k?, 0.1f charge pump capacitors, and t amb = +25 c. typical performance characteristics figure 2. transmitter output voltage vs. load capacitance for the SP3223Eb figure 3. slew rate vs. load capacitance for the SP3223Eb 30 25 20 15 10 5 0 0 500 1000 2000 3000 4000 5000 load capacitance (pf) - slew + slew 1 t ransmitter at 250kbps 1 t ransmitter at 15.6kbps all drivers loaded 3k + load cap 35 30 25 20 15 10 5 0 load capacitance (pf) 0 1000 2000 3000 4000 5000 2 5 0 k b p s 1 2 5 k b p s 2 0 k b p s 1 t ransmitter at 250kbps 1 t ransmitter at 15.6kbps all drivers loaded 3k + load cap figure 4. supply current vs. load capacitance when transmitting data for the SP3223Eb figure 5. supply current vs. supply voltage for the SP3223Eb 20 15 10 5 0 2.7 3 3.5 4 4.5 5 supply v oltage (v d c ) 1 t ransmitter at 250kbps 2 t ransmitters at 15.6kbps all drivers loaded with 3k // 1000pf figure 6. transmitter output voltage vs. supply voltage for the SP3223Eb 6 4 2 0 -2 -4 -6 0 1000 2000 3000 4000 5000 txout + txout - load capacitance (pf) 6 4 2 0 -2 -4 -6 2.7 3 3.5 4 4.5 5 supply v oltage (v d c ) t x o u t - t x o u t + supply voltage (vdc) supply voltage (vdc)
7 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 unless otherwise noted, the following performance characteristics apply for v cc = +3.3v, 000kbps data rate, all drivers loaded with 3k?, 0.1f charge pump capacitors, and t amb = +25 c. figure 8. transmitter output voltage vs. supply voltage for the SP3223Eu 2.7 3 3.5 4 4.5 5 supply v oltage (v) 6 4 2 0 -2 -4 -6 1 d r i v e r a t 1 m b p s o t h e r d r i v e r s a t 6 2 . 5 k b p s a l l d r i v e r s l o a d e d w i t h 3 k / / 2 5 0 p f figure 2. transmitter output voltage vs. supply voltage for the SP3223Eu 0 250 500 1000 1500 load capacitance (pf) 35 30 25 20 15 10 5 0 t 1 a t 1 m b p s t 2 a t 6 2 . 5 k b p s 2.7 3 3.5 4 4.5 5 supply v oltage (v) 6 4 2 0 -2 -4 -6 t 1 a t 1 m b p s t 2 a t 6 2 . 5 k b p s a l l d r i v e r s l o a d e d w i t h 3 k / / 2 5 0 p f figure 7. transmitter skew vs. load capacitance for the SP3223Eu 0 250 500 1000 1500 2000 200 150 100 50 0 load capacitance (pf) t 1 a t 5 0 0 k b p s t 2 a t 3 1 . 2 k b p s a l l t x l o a d e d 3 k / / c l o a d figure 9. transmitter output voltage vs. load capacitance for the SP3223Eu figure . supply current vs. supply voltage for the SP3223Eu 0 250 500 1000 1500 load capacitance (pf) 6 4 2 0 -2 -4 -6 t 1 a t 1 m b p s t 2 a t 6 2 . 5 k b p s 2.7 3 3.5 4 4.5 5 supply v oltage (v) 20 15 10 5 0 t 1 a t 1 m b p s t 2 a t 6 2 . 5 k b p s a l l d r i v e r s l o a d e d w i t h 3 k / / 2 5 0 p f figure 0. supply current vs. load capacitance for the SP3223Eu typical performance characteristics supply voltage (v) supply voltage (v) supply voltage (v)
exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 8 pin description name function pin # en receiver enable, apply logic low for normal operation. apply logic high to disable receiver outputs (high-z state). c+ positive terminal of the voltage doubler charge-pump capacitor 2 v+ regulated +5.5v output generated by charge pump 3 c- negative terminal of the voltage doubler charge-pump capacitor 4 c2+ positive terminal of the inverting charge-pump capacitor 5 c2- negative terminal of the inverting charge-pump capacitor 6 v- regulated -5.5v output generated by charge pump 7 t 2 out rs-232 driver output 8 r 2 in rs-232 receiver input 9 r 2 out ttl/cmos receiver output 0 status ttl/cmos output indicating online and shutdown status t 2 in ttl/cmos driver input 2 t in ttl/cmos driver input 3 online apply logic high to override auto on-line ? circuitry keeping drivers active (shutdown must also be logic high, refer to table 2). 4 r out ttl/cmos receiver output 5 r in rs-232 receiver input 6 t out rs-232 driver output 7 gnd ground 8 vcc +3.0v to +5.5v supply voltage 9 shutdown apply logic low to shut down drivers and charge pump. this overrides all auto on-line ? circuitry and online (refer to table 2). 20 table 2. pin description
9 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 description the sp3223 is a 2-driver/2-receiver device ideal for portable or handheld applications. the sp3223 transceivers meet the eia/tia- 232 and itu-t v.28/v.24 communication protocols and can be implemented in battery- powered, portable, or handheld applications such as notebook or handheld computers. the sp3223 devices feature exar's propri - etary on-board charge pump circuitry that generates 5.5v rs-232 voltage levels from a single +3.0v to +5.5v power supply. these devices are an ideal choice for power sensitive designs. featuring auto on-line ? circuitry, the sp3223 reduces the power sup - ply drain to a a supply current. in many portable or handheld 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 system automatically comes online. this feature allows design engineers to address power saving concerns without major design changes. theory of operation the sp3223 series is made up of four basic circuit blocks: . drivers, 2. receivers, 3. the exar pro - prietary 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 + 5.4v with no load and + 5v minimum fully loaded. the driver outputs are protected against infnite short-circuits to ground without degrada - tion in reliability. these drivers comply with the eia-tia-232f and all previous rs-232 versions. unused driver inputs should be connected to gnd or v cc . the drivers can guarantee output data rates fully loaded with 3k? in parallel with 000pf, (SP3223Eu, c l = 250pf) ensuring compatibility with pc-to-pc communication software. the slew rate of the driver output on the e and eb versions is internally limited to a maximum of 30v/s in order to meet the eia standards (eia rs-232d 2. .7, paragraph 5). the slew rate of eu version is not limited to enable higher speed data transfers. the transition of the loaded output from high to low also meets the monotonicity require - ments of the standard. figure 4 shows a loopback test circuit used to test the rs-232 drivers. figure 5 shows the test results where one driver was active at 250kbps and all drivers are loaded with an rs-232 receiver in parallel with a 000pf capacitor. rs-232 data transmission rate of 20kbps to mbps provide compatibility with designs in personal computer peripherals and lan applications. figure 3. interface circuitry controlled by micropro - cessor supervisory circuit sp3223 e 2 4 6 5 3 7 19 5k? 5k? gn d c1+ c1- c2+ c2- v+ v- v cc 11 12 15 10 0.1f + c2 c5 c1 + + c3 c4 + + 17 8 16 9 rs-232 outputs rs-232 inputs 14 20 11 v cc 18 r 1 ou t r 1 in t 1 ou t t 1 in t 2 in r 2 in r 2 ou t online shutdown status uart or serial c p supervisor ic ttl/cmos inputs v cc v in reset 0.1f 0.1f 0.1f 0.1f t 2 ou t en ttl/cmos outputs
exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 0 receivers the receivers convert 5.0v eia/tia-232 levels to ttl or cmos logic output levels. receivers have an inverting output that can be disabled by using the en pin. receivers are active when the auto on- line? circuitry is enabled or when in shut - down. during the shutdown, the receivers will continue to be active. if there is no activity present at the receivers for a period longer than 00s or when shutdown is enabled, the device goes into a standby mode where the circuit draws a. driving en to a logic high forces the outputs of the receivers into high-impedance. the truth table logic of the sp3223 driver and receiver outputs can be found in table 2 . since receiver input is usually from a trans - mission 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. table 3. shutdown and en truth tables note: in auto on-line ? mode where online = gnd and shutdown = v cc , the device will shut down if there is no activity present at the receiver inputs. figure 4. loopback test circuit for rs-232 driver data transmission rates charge pump the charge pump uses a unique approach compared to older lessCeffcient 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 input voltage (v cc ) over the +3.0v to +5.5v range. this is important to maintain compliant rs- 232 levels regardless of power supply fuctuations. figure 5. loopback test circuit result at 250kbps (all drivers fully loaded) device: sp3223 shutdown en t x out r x out 0 0 high z active 0 high z high z 0 active active active high z
exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 the charge pump operates in a discontinu - ous mode using an internal oscillator. if the output voltages are less than a magnitude of 5.5v, the charge pump is enabled. if the output voltages exceed a magnitude of 5.5v, the charge pump is disabled. this oscillator controls the four phases of the voltage shift - ing. a description of each phase follows. phase 1 v ss charge storage during this phase of the clock cycle, the positive side of capaci - tors c and c 2 are initially charged to v cc . c l + is then switched to gnd and the charge in c C is transferred to c 2 C . since c 2 + is con - nected to v cc , the voltage potential across capacitor c 2 is now 2 times v cc . phase 2 v ss transfer phase two of the clock connects the negative terminal of c 2 to the v ss storage capacitor and the positive terminal of c 2 to gnd. this transfers a negative gener - ated voltage to c 3 . this generated voltage is regulated to a minimum voltage of -5.5v. simultaneous with the transfer of the volt - age to c 3 , the positive side of capacitor c is switched to v cc and the negative side is connected to gnd. phase 3 v dd charge storage the third phase of the clock is identical to the frst phase the charge transferred in c produces Cv cc in the negative terminal of c , which is applied to the negative side of capacitor c 2 . since c 2 + is at v cc , the voltage potential across c 2 is 2 times v cc . phase 4 v dd transfer the fourth phase of the clock connects the negative terminal of c 2 to gnd, and transfers this positive generated voltage across c 2 to c 4 , the v dd storage capacitor. this voltage is regulated to +5.5v. at this voltage, the in - ternal oscillator is disabled. simultaneous with the transfer of the voltage to c 4 , the positive side of capacitor c is switched to v cc and the negative side is switched to gnd, al - lowing the charge pump cycle to begin again. the charge pump cycle will continue as long as the operational conditions for the internal oscillator are present. since both v + and v C are separately gener - ated from v cc , in a noCload condition v + and v C will be symmetrical. older charge pump approaches that generate v C from v + will show a decrease in the magnitude of v C compared to v + due to the inherent ineffciencies in the design. the exar charge pump is designed to operate reliably with a range of low cost capacitors. either polarized or non polar - ized capacitors may be used. if polarized capacitors are used they should be oriented as shown in the typical operating circuit. the v+ capacitor may be connected to either ground or vcc (polarity reversed.) the charge pump operates with 0. f capacitors for 3.3v operation. for other supply voltages, see table 4 for required capacitor values. do not use values smaller than those listed. increasing the capacitor values (e.g., by doubling in value) reduces ripple on the transmitter outputs and may slightly reduce power consumption. c2, c3, and c4 can be increased without changing c s value. for best charge pump effciency locate the charge pump and bypass capacitors as close as possible to the ic. surface mount capacitors are best for this purpose. using capacitors with lower equivalent series re - sistance (esr) and self-inductance, along with minimizing parasitic pcb trace induc - tance will optimize charge pump operation. designers are also advised to consider that capacitor values may shift over time and operating temperature.
exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 2 figure 6. charge pump - phase figure 7. charge pump - phase 2 v cc = +5v ?5v ?5v +5v v ss storage capacitor v dd storage capacitor c 1 c 2 c 3 c 4 + + + + ? ? ? ? v cc = +5v ?10v v ss storage capacitor v dd storage capacitor c 1 c 2 c 3 c 4 + + + + ? ? ? ? ch1 2.00v ch2 2.00v m 1.00ms ch1 1.96v 2 1 t t [ ] t 2 +6v a) c 2+ b) c 2 - -6v 0v 0v figure 8. charge pump waveforms figure 9. charge pump - phase 3 v cc = +5v ?5v +5v ?5v v ss storage capacitor v dd storage capacitor c 1 c 2 c 3 c 4 + + + + ? ? ? ? figure 20. charge pump - phase 4 v cc = +5v +10v v ss storage capacitor v dd storage capacitor c 1 c 2 c 3 c 4 + + + + ? ? ? ? minimum recommended charge pump capacitor value input voltage v cc charge pump capacitor value 3.0v to 3.6v c - c4 = 0.f 4.5v to 5.5v c = 0.047f, c2-c4 = 0.33f 3.0v to 5.5v c - c4 = 0.22f table 4. minimum charge pump capacitor values
3 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 auto on-line ? circuitry the sp3223 device has auto on-line ? circuitry on board that saves power in ap - plications such as laptop computers, pda's, and other portable systems. the sp3223 device incorporates an auto on-line ? circuit that automatically enables itself when the external transmitter is enabled and the cable is connected. conversely, 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 a. this function is externally controlled by the online pin. when this pin is tied to a logic low, the auto on-line ? function is ac - tive. once active, the device is enabled until there is no activity on receiver inputs. the receiver input typically sees at least 3v, which are generated from the transmitter at the other end of the cable with a 5v minimum. when the external transmitter is disabled or the cable is disconnected, the receiver input will be pulled down by its internal 5k? resistor to ground. when this occurs over a period of time, the internal transmitters will be disabled and the device goes into a shutdown or standby mode. when the online pin is high, the auto on-line ? mode is disabled. the auto on-line ? circuit has two stages: ) inactive detection 2) accumulated delay the frst stage, shown in figure 22, detects an inactive input. a logic high is asserted on r x inact if the cable is disconnected or the external transmitters are disabled. otherwise, r x inact will be at a logic low. this circuit is duplicated for each of the other receivers. the second stage of the auto on-line ? circuitry, shown in figure 23, processes the receiver's r x inact signal with an ac - cumulated delay that disables the device to a a typical supply current. the status pin goes to a logic low when the cable is disconnected, the external transmit - ter is disabled, or the shutdown pin is invoked. the typical accumulated delay is around 20s. when the sp3223 drivers and internal charge pump are disabled, the supply current is reduced to a typical. this can commonly occur in handheld or portable applications where the rs-232 cable is disconnected or the rs-232 drivers of the connected peripheral are truned off. the auto on-line ? mode can be disabled by the shutdown pin. if this pin is a logic low, the auto on-line ? function will not operate regardless of the logic state of the online pin. table 5 summarizes the logic of the auto on-line ? operating modes. the truth table logic of the sp3223 driver and receiver outputs can be found in table 3. the status pin outputs a logic low signal if the device is shutdown. this pin goes to a logic high when the external transmitter is enabled and the cable is connected. when the sp3223 device is shutdown, 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 capacitors 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 200s. for easy programming, the status can be used to indicate dtr or a ring indicator signal. tying online and shutdown together will bypass the auto on-line ? circuitry so this connection acts like a shut - down input pin
exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 4 figure 2 . auto on-line ? timing waveforms r e c e i v e r r s - 2 3 2 i n p u t v o l t a g e s s t a t u s + 5 v 0 v - 5 v t s t s l t s t s h t o n l i n e v c c 0 v d r i v e r r s - 2 3 2 o u t p u t v o l t a g e s 0 v + 2 . 7 v - 2 . 7 v s h u t d o w n table 5. auto on-line ? logic figure 22. stage i of auto on-line ? circuitry figure 23. stage ii of auto on-line ? circuitry rs-232 recei v er block r x inact inactive detection block r x in r x out r 1 on r 2 on delay buf fer delay buf fer shutdow n inactive rs-232 signal at receiver input shutdown online status transceiver status yes high low high normal operation (auto on-line?) no high high low normal operation no high low low shutdown (auto on-line?) yes low high/low high shutdown no low high/low low shutdown
5 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 esd t olerance t h e s p 3 2 2 3 s e r i e s i n c o r p o r a t e s ruggedized esd cells on all driver output and receiver input pins. the esd structure is improved over our previous family for more rugged applications and environments sensitive to electro-static discharges and associated transients. the improved esd tolerance is at least + 5kv without damage nor latch-up. there are different methods of esd testing applied: a) mil-std-883, method 305.7 b) iec6 000-4-2 air-discharge c) iec6000-4-2 direct contact the human body model has been the generally accepted esd testing method for semiconductors. this method is also specifed in mil-std-883, method 3015.7 for esd testing. the premise of this esd test is to simulate the human bodys potential to store electro-static energy and discharge it to an integrated circuit. the simulation is performed by using a test model as shown in figure 24. this method will test the ics capability to withstand an esd transient during normal handling such as in manu - facturing areas where the ic's tend to be handled frequently. the iec-6 000-4-2, formerly iec80 -2, is generally used for testing esd on equipment and systems. for system manufacturers, they must guarantee a certain amount of esd protection since the system itself is ex - posed to the outside environment and human presence. the premise with iec6 000-4-2 is that the system is required to withstand an amount of static electricity when esd is applied to points and surfaces of the equipment that are accessible to personnel during normal usage. the transceiver ic receives most of the esd current when the esd source is applied to the connector pins. the test circuit for iec6 000-4-2 is shown on figure 25. there are two methods within iec6 000-4-2, the air discharge method and the contact discharge method. with the air discharge method, an esd voltage is applied to the equipment under test (eut) through air. this simulates an electrically charged person ready to connect a cable onto the rear of the system only to fnd an unpleas - ant zap just before the person touches the back panel. the high energy potential on the person discharges through an arcing path to the rear panel of the system before he or she even touches the system. this energy, whether discharged directly or through air, is predominantly a function of the discharge current rather than the discharge voltage. variables with an air discharge such as approach speed of the object carrying the esd potential to the system and humidity will tend to change the discharge current. for example, the rise time of the discharge current varies with the approach speed. the contact discharge method applies the esd current directly to the eut. this method was devised to reduce the unpredictability of the esd arc. the discharge current rise time is constant since the energy is directly transferred without the air-gap arc. in situ - ations such as hand held systems, the esd charge can be directly discharged to the equipment from a person already holding the equipment. the current is transferred on to the keypad or the serial port of the equipment directly and then travels through the pcb and fnally to the ic. figure 24. esd test circuit for human body model
exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 6 device pin human b ody iec61000-4-2 tested model air discharge direct contact level driver outputs 15kv 15kv 8kv 4 receiver inputs 15kv 15kv 8kv 4 the circuit model in figures 24 and 25 rep - resent the typical esd testing circuit used for all three methods. the c s is initially charged with the dc power supply when the frst switch (sw ) is on. now that the capacitor is charged, the second switch (sw2) is on while sw switches off. the voltage stored in the capacitor is then applied through r s , the current limiting resistor, onto the device under test (dut). in esd tests, the sw2 switch is pulsed so that the device under test receives a duration of voltage. for the human body model, the current limiting resistor (r s ) and the source capacitor (c s ) are 1.5k? an 100pf, respectively. for iec-6 000-4-2, the current limiting resistor (r s ) and the source capacitor (c s ) are 330? an 50pf, respectively. the higher c s value and lower r s value in the iec6 000-4-2 model are more stringent than the human body model. the larger storage capacitor injects a higher voltage to the test point when sw2 is switched on. the lower current limiting resistor increases the current charge onto the test point. figure 26. esd test waveform for iec6 000-4-2 t=0ns t=30ns 0a 5a 30a t i figure 25. esd test circuit for iec6 000-4-2 table 6. transceiver esd tolerance levels
7 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 package: 20 pin tssop
exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 8 package: 20 pin ssop
9 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 part number temperature range package types SP3223Ebca-l ................................................... 0c to +70c -------------------------------------------- 20-pin ssop SP3223Ebca-l/tr ............................................. 0c to +70c -------------------------------------------- 20-pin ssop SP3223Ebcy-l ................................................... 0c to +70c ------------------------------------------- 20-pin tssop SP3223Ebcy-l/tr ............................................. 0c to +70c ------------------------------------------- 20-pin tssop SP3223Ebea-l ................................................. -40c to +85c ------------------------------------------- 20-pin ssop SP3223Ebea-l/tr ........................................... -40c to +85c ------------------------------------------- 20-pin ssop SP3223Ebey-l ................................................. -40c to +85c ------------------------------------------ 20-pin tssop SP3223Ebey-l/tr ........................................... -40c to +85c ------------------------------------------ 20-pin tssop SP3223Eca-l ..................................................... 0c to +70c ..................................................... 20-pin ssop sp3223 eca-l/tr ............................................... 0c to +70c ..................................................... 20-pin ssop SP3223Ecy-l ..................................................... 0c to +70c ................................................... 20-pin tssop SP3223Ecy-l/tr ............................................... 0c to +70c ................................................... 20-pin tssop SP3223Eea-l ................................................... -40c to +85c .................................................... 20-pin ssop sp3223 eea-l/tr ............................................. -40c to +85c .................................................... 20-pin ssop SP3223Eey-l .................................................... -40c to +85c .................................................. 20-pin tssop SP3223Eey-l/tr .............................................. -40c to +85c .................................................. 20-pin tssop SP3223Euca-l .................................................. 0c to +70c ..................................................... 20-pin ssop SP3223Euca-l/tr ............................................ 0c to +70c ..................................................... 20-pin ssop SP3223Eucy-l ................................................... 0c to +70c ................................................... 20-pin tssop SP3223Eucy-l/tr ............................................. 0c to +70c ................................................... 20-pin tssop SP3223Euea-l ................................................. -40c to +85c .................................................... 20-pin ssop SP3223Euea-l/tr ........................................... -40c to +85c .................................................... 20-pin ssop SP3223Euey-l ................................................. -40c to +85c .................................................. 20-pin tssop SP3223Euey-l/tr ........................................... -40c to +85c .................................................. 20-pin tssop note: "-l" indicates lead free packaging, "/tr" is for tape and reel option ordering information sp 3223 e u ey l /tr t ape and reel options ?l? suffix indicates lead free packaging package type a= ssop y=tssop t emperature range c= commercial range 0oc to 70oc e= extended range -40oc to 85oc speed indicator blank= 120kbps b= 250kbps u= 1mbps esd rating e= 15kv hbm and iec 1000- 4 part number product nomenclature
exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com SP3223E/eb/eu_0_06272 20 date revision description 0-06-06 --- legacy sipex data sheet nov 200 .0.0 convert to exar data sheet format and remove eol parts. june 202 .0. correct type error on page pin diagram. pin 9 should be r2in not rin, change esd protection levels to iec6000-4-2. revision history notice exar corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliability. exar corporation assumes 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 user's specifc application. while the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. exar corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to signifcantly af fect its safety or effectiveness. products are not authorized for use in such applications unless exar corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized ; (b) the user assumes all such risks; (c) potential liability of exar corporation is adequately protected under the circumstances. copyright 202 exar corporation datasheet june 202 for technical support please email exar's serial technical support group at: serialtechsupport@exar.com reproduction, in part or whole, without the prior written consent of exar corporation is prohibited.

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