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general description the max13223e is a +3.0v to +5.5v-powered eia/tia-232 and v.28 communications interface with fault protection on the rs-232 line interface. this allows shorts of the transmitter outputs and receiver inputs to voltages in the 70v range without adversely affecting the max13223e. the max13223e achieves 1a supply current using maxims autoshutdown? feature. the max13223e automatically enters a low-power shutdown mode when the rs-232 cable is disconnected or the receivers are inactive. the device turns on again when a valid transition at any receiver input is sensed. a proprietary, high-efficiency, dual charge-pump power supply and a low-dropout transmitter combine to deliver true rs-232 performance from a single +3.0v to +5.5v supply. the max13223e has two receivers and two drivers and is guaranteed to run at data rates of 250kbps for one trans - mitter switching while maintaining rs-232 output levels. the max13223e operates from input voltages ranging from +3.0v to +5.5v and is available in a 20-pin, 6.5mm x 4.4mm, tssop package. the max13223e is specified over the -40c to +85c temperature range. applications telematics equipment base stations utility meters industrial equipment telecomm equipment pos terminal equipment beneits and features robust protection to withstand load dumps, miswiring, and connector failures? 70v fault protection ? overvoltage current limiting ? current protection at transmitter outputs ? thermal shutdown protection flexible power requirements simplify design ? +3.0v to +5.5v single supply voltage ? true rs-232 performance (up to 250kbps) even from +3.0v supply voltage autoshutdown simplifies power savings? automatically enters shutdown mode if rs-232 cable is disconnected or receivers are inactive automatically activates from shutdown when any valid transition is sensed ? 1a typical shutdown current autoshutdown is a trademark of maxim integrated products, inc. 19-4585; rev 3; 2/15 + denotes a lead(pb)-free/rohs-compliant package. part temp range pin-package max13223eeup+ -40 c to +85 c 20 tssop max13223e forceon en r2out r1out forceoff invalid r2in gnd rs-232outputs ttl/cmos inputs t2in t1in r1in t2out t1out v- v+ v cc v cc v cc rs-232inputs to power-management unit ttl/cmos outputs c3 c bypass 0.1f c4 5k ? 5k ? c2- c2+ c2 c1- c1+ c1 max13223e 70v fault-protected, 3.0v to 5.5v, 2tx/2rx rs-232 transceiver typical operating circuit ordering information downloaded from: http:///
(voltages referenced to gnd.) v cc ....................................................................... -0.3v to +7.0v v+ ......................................................................... -0.3v to +7.0v v- ......................................................................... +0.3v to -7.0v v+ to v- .............................................................................. +13v input voltages t1in, t2in, en , forceon, forceoff ...... -0.3v to +6.0v r1in, r2in ..................................................................... 70v output voltages t1out, t2out .............................................................. 70v r1out, r2out, invalid ....................... -0.3v to (v cc + 0.3v) short-circuit duration t1out, t2out ...................................................... continuous continuous power dissipation (t a = +70c) tssop (derate 13.6mw/c above +70c) .............. 1084mw operating temperature range .......................... -40c to +85c junction temperature ...................................................... +150c storage temperature range ........................... -65c to +150c lead temperature (soldering, 10s) ................................. +300c soldering temperature (reflow) ....................................... +260c tssop junction-to-ambient thermal resistance ( ja ) ....... 73.8c/w junction-to-case thermal resistance ( jc ) ............... 20c/w (note 1) (v cc = +3.0v to +5.5v, t a = -40c to +85c, unless otherwise noted. typical values are at v cc = +3.3v, t a = +25c, unless other - wise noted. for v cc = +3.0v to +3.6v, c1 = c2 = c3 = 0.1f, c4 = 1f. for v cc = +4.5v to +5.5v, c1 = 47nf, c2 = c3 = 330nf, c4 = 1f.) (note 2) parameter symbol conditions min typ max units supply voltage v cc 3.0 5.5 v supply current autoshutdown disabled (forceon = forceoff = v cc ), no load 8 15 ma supply current autoshutdown i asd forceon = gnd, forceoff = v cc , r1in and r2in idle, t1in and t2in idle 1.0 10 a supply current shutdown i sd forceoff = gnd 1.0 10 a logic inputs input-logic low v t_in,lo t_in, en , forceon, forceoff , v cc = +3.3v to +3.6v, +5.0v to +5.5v 0.8 v input-logic high v t_in,hi t_in, forceon, forceoff , en v cc = +3.3v 2.0 v v cc = +5.0v 2.4 transmitter input hysteresis v tx,inhys 0.5 v input leakage current i in,lkg t_in, en , forceon, forceoff 0.01 1 a receiver outputs output leakage current i rx,out,lkg en = v cc 0.05 10 a output-voltage low v rx,out,lo i out = 1.6ma 0.4 v output-voltage high v rx,out,hi i out = -1.0ma v cc - 0.6 v cc - 0.2 v max13223e 70v fault-protected, 3.0v to 5.5v, 2tx/2rx rs-232 transceiver www.maximintegrated.com maxim integrated 2 note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-layer board. for detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial . absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. package thermal characteristicselectrical characteristics downloaded from: http:///
(v cc = +3.0v to +5.5v, t a = -40c to +85c, unless otherwise noted. typical values are at v cc = +3.3v, t a = +25c, unless other - wise noted. for v cc = +3.0v to +3.6v, c1 = c2 = c3 = 0.1f, c4 = 1f. for v cc = +4.5v to +5.5v, c1 = 47nf, c2 = c3 = 330nf, c4 = 1f.) (note 2) parameter symbol conditions min typ max units invalid output (autoshutdown (forceon = gnd, forceoff = v cc )) receiver-input level to invalid output high v rx_in, inv_hi figure 6a positive level 2.7 v negative level -2.7 receiver-input level to invalid output low v rx_in, inv_lo figure 6a -0.3 +0.3 v invalid output-voltage low v rx,inv_lo i out = 1.6ma 0.4 v invalid output-voltage high v rx,inv_hi i out = -1.0ma v cc - 0.6 v receiver inputs input-voltage range v rx,in (note 3) -70 +70 v overvoltage threshold |v rx,ovthr | 24 28.3 32 v input threshold low v rx,lo v cc = +3.3v 0.6 v v cc = +5.0v 0.8 input threshold high v rx,hi v cc = +3.3v 2.4 v v cc = +5.0v 2.4 input resistance r rx,inres -24v < v r_in < +24v (note 3) 3 5 7 k? v cc = v+ = v- = 0v 35 250 +32v < |v r_in | < +70v 35 250 transmitter outputs output-voltage swing v o r l = 3k?, figure 4 5 6 v output resistance r tx,rout v cc = v+ = v- = 0v, v t_out = 2v 300 ? overvoltage protection threshold |v tx,fb | 14 19 v output short-circuit current i tx,short t_out = gnd 80 ma overvoltage current i tx,ifbout v t_out > v tx,fb 6 ma v t_out < -v tx,fb -6 output leakage current in shutdown mode i tx,lkg v t_out = +12v 450 900 a v t_out = -12v, v cc = 0v, or +3v to +5.5v in shutdown mode -150 -80 protectionovervoltage protection range r1in, r2in, t1out, t2out -70 +70 v esd protection (note 4) r1in, r2in, t1out, t2out iec 6100-4-2 contact discharge 8 kv human body model 8 all other pins human body model 2 max13223e 70v fault-protected, 3.0v to 5.5v, 2tx/2rx rs-232 transceiver www.maximintegrated.com maxim integrated 3 electrical characteristics (continued) downloaded from: http:///
(v cc = +3.0v to +5.5v, t a = -40c to +85c, unless otherwise noted. typical values are at v cc = +3.3v, t a = +25c, unless other - wise noted. for v cc = +3.0v to +3.6v, c1 = c2 = c3 = 0.1f, c4 = 1f. for v cc = +4.5v to +5.5v, c1 = 47nf, c2 = c3 = 330nf, c4 = 1f.) (note 2) note 2: all devices are 100% production tested at t a = +85c. specifications are over -40c to +85c and are guaranteed by design. note 3: both receivers will operate over the 70v input range. the input resistance increases with input voltage. the input resis - tance will increase within 24v |v r_in | 32v. note 4: guaranteed by design, not production tested. note 5: transmitter skew is measured at the transmitter zero crosspoints. note 6: output recovery time is the delayed time for the transmitter to enter normal operating mode after an overvoltage condition. parameter symbol conditions min typ max units maximum data rate dr r l = 3k?, c l = 1000pf, one transmitter switching, figure 1 250 kbps receiver positive or negative threshold to invalid high t invh v cc = 5v, figure 6b 1 s receiver positive or negative threshold to invalid low t invl v cc = 5v, figure 6b 30 s receiver edge to transmitters enabled t wu v cc = 5v, figure 6b 135 s receiver-output enable time t rx,en normal operation 200 ns receiver-output disable time t rx,dis normal operation 200 ns receiver skew |t prhl - t prlh | 50 ns transmitter skew |t pthl - t ptlh | (note 5) 200 ns receiver propagation delay t prhl c l = 150pf, figure 4 0.3 s t prlh 0.3 transmitter propagation delay t pthl c l = 1nf, r l = 3k?, figure 3 0.8 s t ptlh 0.6 transmitter fall time or rise time t r , t f figure 3 0.3 s transmitter time to exit shutdown t shdn figure 7 100 s output recovery time t tx,rec c l = 1nf, r l = 5k (note 6) 100 s transition-region slew rate sr out v cc = +3.3v, r l = 3k? to 7k?, t a = +25oc, measured from +3v to -3v or -3v to +3v, one transmitter switching, c l = 1nf 6 30 v/s max13223e 70v fault-protected, 3.0v to 5.5v, 2tx/2rx rs-232 transceiver www.maximintegrated.com maxim integrated 4 timing characteristics downloaded from: http:///
figure 1. driver test circuit figure 3. driver propagation delay figure 4. receiver propagation delay figure 2. receiver test circuit c l r l v o t_in t_out 0 t pthl 0 v 0 -v 0 t_in t_out -3v 3v t f t r 0 3v -3v v cc /2 t ptlh v cc /2 v cc t prhl t prlh 1.3v 1.7v v cc /2 v cc /2 v il v 0h v 0l r_in r_out v ih t r , t f 10ns t_in t_out r_in r_out 15pf max13223e 70v fault-protected, 3.0v to 5.5v, 2tx/2rx rs-232 transceiver www.maximintegrated.com maxim integrated 5 test circuits timing diagrams downloaded from: http:///
(t a = +25c, unless otherwise noted.) 0 22 2018 16 14 12 10 86 4 2 0 5000 slew rate vs. load capacitance max13223e toc02 load capacitance (pf) slew rate (v/s) 2000 1000 3000 4000 + slew - slew 0 10 5 2520 15 4035 30 45 0 2000 1000 3000 4000 5000 operating supply current vs. load capacitance max13223e toc03 load capacitance (pf) supply current (ma) 250kbps 120kbps 20kbps t1 transmitting at 250kbpst2 transmitting at 15.6kbps transmitter time to exit shutdown max13223e toc04 40s/div 5v/div2v/div t2outt1out v cc = +3.3v c1Cc4 = 0.1f forceon =forceoff -8 -6 -4 -2 0 2 4 6 8 0 1000 2000 3000 4000 5000 transmitter output voltage vs. load capacitance max13223e toc01 load capacitance (pf) transmitter output voltage (v) v out+ v out- 2019 18 17 16 15 14 13 12 3 4 5 6 7 8 v cc gnd t1out c1- v+ c1+ r1inr1out forceon t1in t2out v- c2- c2+ 12 11 9 10 t2in r2out r2in tssop max13223e invalid forceoff en top view max13223e 70v fault-protected, 3.0v to 5.5v, 2tx/2rx rs-232 transceiver maxim integrated 6 www.maximintegrated.com typical operating characteristics pin coniguration downloaded from: http:///
detailed description figure 2 shows the receiver test circuit. figure 3 shows driver propagation delay and figure 4 shows receiver propagation delay. dual charge-pump voltage converter the max13223e internal power supply consists of a dual-mode regulated charge pump that provides output voltages of +5.5v (doubling charge pump) and -5.5v (inverting charge pump), regardless of the input voltage (v cc ) over the +3.0v to +5.5v range. the charge pumps operate in a discontinuous mode. if the output voltages are less than 5.5v, the charge pumps are enabled. if the output voltages exceed 5.5v, the charge pumps are dis - abled. each charge pump requires a flying capacitor (c1, c2) and a reservoir capacitor (c3, c4) to generate the v+ and v- supplies. rs-232 transmitters the transmitters are inverting level translators that convert logic levels to eia/tia-232/v.28 levels. they guarantee a 250kbps data rate with worst-case loads of 3k in paral - lel with 1000pf, providing compatibility with pc-to-pc communication software. the max13223e can operate at data rates of 250kbps (max). transmitters can be par - alleled to drive multiple receivers. when forceoff is driven to ground, or the autoshutdown circuitry senses invalid voltage levels at all receiver inputs, the transmitters are disabled and the outputs are forced into a high-imped - ance state. figure 5 shows a complete system connection. rs-232 receivers the max13223es receivers convert rs-232 signals to logic output levels. both receiver outputs can be three - stated using the en input. in shutdown ( forceoff or autoshutdown), the max13223es receiver outputs are active and asserted low if en = low (table 1). driving en high places the receivers outputs in a high-impedance state. pin name function 1 en receiver enable control input. drive en low for normal operation. drive en high to force the receiver outputs (r1out, r2out) into a high-impedance state. 2 c1+ positive terminal of the voltage doubler charge-pump capacitor 3 v+ +5.5v generated by charge pump 4 c1- negative terminal of the voltage doubler charge-pump capacitor 5 c2+ positive terminal of inverting charge-pump capacitor 6 c2- negative terminal of inverting charge-pump capacitor 7 v- -5.5v generated by charge pump 8 t2out rs-232 transmitter 2 output 9 r2in rs-232 receiver 2 input 10 r2out receiver 2 logic output 11 invalid valid signal detector output. invalid is high if a valid rs-232 level is present on any receiver input. 12 t2in transmitter 2 logic input 13 t1in transmitter 1 logic input 14 forceon active-high forceon input. drive forceon high to override autoshutdown, keeping transmitters and charge pump on ( forceoff must be high). 15 r1out receiver 1 logic output 16 r1in rs-232 receiver 1 input 17 t1out rs-232 transmitter 1 output 18 gnd ground 19 v cc +3.0v to +5.5v supply voltage. bypass v cc with a 0.1f ceramic capacitor located as close to the device as possible. 20 forceoff active-low forceoff input. drive forceoff low to shut down transmitters, receivers, and on-board charge pumps, overriding autoshutdown and forceon. max13223e 70v fault-protected, 3.0v to 5.5v, 2tx/2rx rs-232 transceiver www.maximintegrated.com maxim integrated 7 pin description downloaded from: http:///
autoshutdown the max13223e achieves 1a supply current with maxims autoshutdown feature, which operates when forceon is low and forceoff is high. when the device senses no valid signal levels on both receiver inputs for > 30s (typ), the onboard charge pump and drivers are shut off, reducing supply current to 1a. this occurs if the rs-232 cable is disconnected or the connect - ed peripheral transmitters are turned off. the device turns on again when a valid level is applied to either rs-232 receiver input. as a result, the system saves power. table 2 summarizes the max13223es operating modes. forceon and forceoff override autoshutdown. when neither control is asserted, the ic selects between these states automatically, based on receiver input levels. figure 6a shows the input levels and figure 6b shows the timing diagram for autoshutdown operation. software-controlled shutdown if direct software control is desired, invalid can be used to indicate a dtr or ring indicator signal. connect forceoff and forceon together to bypass autoshutdown; therefore, the line acts as a shdn input. table 1. receiver control truth table figure 5. interface under control of pmu figures 6a and 6b. trip levels for entering and exiting autoshutdown en operation mode r_out 0 active (forceon), or active (autoshutdown) active 0 shutdown ( forceoff ), or shutdown (autoshutdown) active and asserted low 1 shutdown status is dont care high impedance max13223e uart forceon forceoff power- management unit or cpu invalid rs-232 receiver input autoshutdown, transmitter disabled, 1a supply current -2.7v b) a) -0.3v +2.7v+0.3v 0 indeterminate indeterminate transmitter enabled, invalid high transmitter enabled, invalid high t invl t invh t wu v+ v- 0 +2.7v+0.3v -0.3v-2.7v 0 v cc v cc receiver input voltage (v) invalid output (v) invalidregion max13223e 70v fault-protected, 3.0v to 5.5v, 2tx/2rx rs-232 transceiver www.maximintegrated.com maxim integrated 8 downloaded from: http:///
applications information capacitor selection the capacitor type used for c1Cc4 is not critical for prop - er operation; either polarized or nonpolarized capacitors may be used. the charge pump requires 0.1f capaci - tors for 3.3v operation. for other supply voltages, see table 3 for required capacitor values. do not use values smaller than those listed in table 3. increasing the capaci - tor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consump - tion. c2, c3, and c4 can be increased without changing c1s value. however, do not increase c1 without also increasing the values of c2, c3, and c4 to maintain the proper ratios (c1 to the other capacitors). when using the minimum required capacitor values, make sure the capacitor value does not degrade excessively with temperature. if in doubt, use capacitors with a larger nom - inal value. the capacitors equivalent series resistance (esr) usually rises at low temperatures and influences the amount of ripple on v+ and v-. power-supply decoupling in most circumstances, a 0.1f v cc bypass capacitor is adequate. in applications that are sensitive to power-sup - ply noise, decouple v cc to ground with a capacitor of the same value as the charge-pump capacitor c1. connect bypass capacitors as close to the ic as possible. transmitter outputs when exiting shutdown figure 7 shows two transmitter outputs when exiting shut - down mode. as they become active, the two transmitter outputs are shown going to opposite rs-232 levels. each transmitter is loaded with 3k in parallel with 2500pf. the transmitter outputs display no ringing or undesirable transients as they come out of shutdown. note that the transmitters are enabled only when the magnitude of v- exceeds approximately 3v. table 2. autoshutdown control table 3. required capacitor values x = dont care. figure 7. transmitter outputs when exiting shutdown or powering up inputs outputs forceoff forceon valid receiver input level invalid output operation mode t_out 0 x no 0 shutdown (forced off) high-z 0 x yes 1 shutdown (forced off) high-z 1 0 no 0 shutdown (autoshutdown) high-z 1 0 yes 1 active (autoshutdown) active 1 1 no 0 active (forced on) active 1 1 yes 1 active (forced on) active v cc (v) c1, c bypass (f) c2, c3 (f) c4 (f) 3.0 to 3.6 0.1 0.1 1 4.5 to 5.5 0.047 0.33 1 40s/div 5v/div2v/div t2outt1out v cc = +3.3v c1Cc4 = 0.1f forceon =forceoff max13223e 70v fault-protected, 3.0v to 5.5v, 2tx/2rx rs-232 transceiver www.maximintegrated.com maxim integrated 9 downloaded from: http:///
fault protection the max13223e is designed to survive faults such as direct shorts to power supplies, miswiring faults, connec - tor failures, and tool misapplications of the transmitter outputs and receiver inputs to voltages in the 70v range without damage. this fault protection is applicable in all modes of the max13223e: active, shutdown, and pow - ered down. both receivers operate over the 70v input range, but the termination resistor (r rx,i ) increases when |v r_in | voltage exceeds 32v. a receivers input termina - tion resistor reduces to its nominal value if the input volt - age reduces to within the 24v range. the receiver inputs and transmitter outputs are independently fault protected. 8kv esd protection as with all maxim devices, esd-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. in using the max13223e, c4 must be a 1f capacitor for the extended esd protection. the driver outputs and receiver inputs of the max13223e have extra protec - tion against static electricity. maxims engineers have developed state-of-the-art structures to protect these pins against esd of 8kv without damage. the esd structures withstand high esd in all states: normal operation, shutdown, and powered down. after an esd event, maxims e versions keep working without latchup, whereas competing rs-232 products can latch and must be powered down to remove latchup. esd protection can be tested in various ways. the transmitter outputs and receiver inputs of this product family are characterized for protection to the following limits: 1) 8kv using the human body model 2) 8kv using the contact-discharge method specified in iec 61000-4-2 esd test conditions esd performance depends on a variety of conditions. contact maxim for a reliability report that documents test setup, test methodology, and test results. human body model figure 8a shows the human body model and figure 8b shows the current waveform it generates when dis - charged into a low impedance. this model consists of a 100pf capacitor charged to the esd voltage of interest, which is then discharged into the test device through a 1.5k resistor. iec 61000-4-2 the iec 61000-4-2 standard covers esd testing and performance of finished equipment. it does not specifically refer to integrated circuits. the major difference between tests done using the human body model and iec 61000-4- 2 is higher peak current in iec 61000-4-2, because series resistance is lower in the iec 61000-4-2 model. hence, the esd withstand voltage measured to iec 61000-4-2 is generally lower than that measured using the human body model. figure 9a shows the iec 61000-4-2 model and figure 9b shows the current waveform for the 8kv, iec 61000-4-2, level 4, esd contact-discharge method. figure 8a. human body esd test model figure 8b. human body current waveform charge-current limit resistor discharge resistance storagecapacitor c s 100pf r c 1m r d 1500 high- voltage dc source device under test i p 100% 90% 36.8% t rl time t dl current waveform peak-to-peak ringing(not drawn to scale) i r 10% 0 0 amperes max13223e 70v fault-protected, 3.0v to 5.5v, 2tx/2rx rs-232 transceiver www.maximintegrated.com maxim integrated 10 downloaded from: http:///
figure 9a. iec 61000-4-2 esd test model figure 9b. iec 61000-4-2 esd generator current waveform package type package code outline no. land pattern no. 20 tssop u20+2 21-0066 90-0116 charge current limit resistor discharge resistance storagecapacitor c s 150pf r c 50m to 100m r d 330 high- voltage dc source device under test t r = 0.7ns to 1ns 30ns 60ns t 100% 90%10% i peak i max13223e 70v fault-protected, 3.0v to 5.5v, 2tx/2rx rs-232 transceiver www.maximintegrated.com maxim integrated 11 package information for the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. chip information process: cmos downloaded from: http:///
revision number revision date description pages changed 0 4/09 initial release 1 2/11 added soldering information to the absolute maximum ratings section; updated the electrical characteristics globals information for c1 = c2 = c3 = 0.1f and c2 = c3 = 330nf; corrected the reference of v out to v t_out for the overvoltage current parameter in the electrical characteristics table; added r_out to figure 2; updated the rs-232 receivers section description and table 1; added the land pattern no. to the package information table 2, 3, 4, 5, 7, 8, 11 2 11/14 removed automotive reference in applications section 1 3 2/15 added the beneits and features section 1 maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and speciications without n otice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. max13223e 70v fault-protected, 3.0v to 5.5v, 2tx/2rx rs-232 transceiver ? 2015 maxim integrated products, inc. 12 revision history for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. downloaded from: http:///

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