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general description the max3230e/max3231e are +2.5v to +5.5v pow- ered eia/tia-232 and v.28/v.24 communications inter- faces with low power requirements, high data-rate capabilities, and enhanced electrostatic discharge (esd) protection, in a chip-scale package (ucsp). all transmitter outputs and receiver inputs are protect- ed to ?5kv using iec 1000-4-2 air-gap discharge, ?kv using iec 1000-4-2 contact discharge, and ?5kv using the human body model. the max3230e/max3231e achieve a 1? supply cur- rent with maxim? autoshutdown feature. they save power without changing the existing bios or operating systems by entering low-power shutdown mode when the rs-232 cable is disconnected, or when the trans- mitters of the connected peripherals are off. the transceivers have a proprietary low-dropout trans- mitter output stage, delivering rs-232-compliant perfor- mance from a +3.1v to +5.5v supply, and rs-232- compatible performance with a supply voltage as low as +2.5v. the dual charge pump requires only four, small 0.1? capacitors for operation from a +3.0v sup- ply. each device is guaranteed to run at data rates of 250kbps while maintaining rs-232 output levels. the max3230e/max3231e offer a separate power-sup- ply input for the logic interface, allowing configurable logic levels on the receiver outputs and transmitter inputs. operating over a +1.65v to v cc range, v l pro- vides the max3230e/max3231e compatibility with mul- tiple logic families. the max3231e contains one receiver and one transmit- ter. the max3230e contains two receivers and two trans- mitters. the max3230e/max3231e are available in tiny chip-scale packaging and are specified across the extended industrial (-40? to +85?) temperature range. applications personal digital assistants cell-phone data lump cables set-top boxes hand-held devices cell phones features ? 6 x 5 chip-scale packaging (ucsp) ? esd protection for rs-232 i/o pins ?5kv?ec 1000-4-2 air-gap discharge ?kv?ec 1000-4-2 contact discharge ?5kv?uman body model ? 1? low-power autoshutdown ? 250kbps guaranteed data rate ? meet eia/tia-232 specifications down to +3.1v ? rs-232 compatible to +2.5v allows operation from single li+ cell ? small 0.1? capacitors ? configurable logic levels max3230e/max3231e ?5kv esd-protected +2.5v to +5.5v rs-232 transceivers in ucsp ________________________________________________________________ maxim integrated products 1 max3230e 5k ? t2out t2in ttl/cmos inputs c2- c2+ c1- c1+ a1 a5 c1 d1 a2 a3 a6 b6 b1 a4 e3 e4 e2 e1 c5 b5 v- v+ v cc 2.5v to 5.5v c4 0.1 f c3 0.1 f c1 0.1 f c bypass c2 0.1 f 0.1 f forceoff forceon invalid t1out t1in gnd v l to power- management unit rs-232 outputs v l v l v l 1.65v to 5.5v 5k ? r2in r2out ttl/cmos outputs d6 c6 e6 e5 r1in r1out rs-232 inputs v l v l 0.1 f t ypical operating circuits 19-3250; rev 0; 5/04 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information ? part ? temp range ? bump-package m a x3 2 3 0 e e bv - t -40? to +85? 6 x 5 ucsp m a x3 2 3 1 e e bv - t -40? to +85? 6 x 5 ucsp ? ucsp is a trademark of maxim integrated products, inc. autoshutdown is a trademark of maxim integrated products, inc. typical operating circuits continued at end of data sheet. pin configurations appear at end of data sheet.
max3230e/max3231e ?5kv esd-protected +2.5v to +5.5v rs-232 transceivers in ucsp 2 _______________________________________________________________________________________ absolute maximum ratings stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. v cc to gnd ...........................................................-0.3v to +6.0v v+ to gnd .............................................................-0.3v to +7.0v v- to gnd ..............................................................+0.3v to -7.0v v+ to |v-| (note 1) ................................................................+13v v l to gnd..............................................................-0.3v to +6.0v input voltages t_in_, forceon, forceoff to gnd .....-0.3v to (v l + 0.3v) r_in_ to gnd ...................................................................?5v output voltages t _ out to gnd ...............................................................?3.2v r _ out invalid to gnd ............................-0.3v to (v l + 0.3v) invalid to gnd.........................................-0.3v to (v cc + 0.3v) short-circuit duration t _ out to gnd........................continuous continuous power dissipation (t a = +70?) 6 ? 5 ucsp (derate 10.1mw/? above +70?) ...........805mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? bump temperature (soldering) infrared (15s) ...............................................................+200? vapor phase (20s) .......................................................+215? electrical characteristics (v cc = +2.5v to +5.5v, v l = +1.65v to +5.5v, c1?4 = 0.1?, tested at +3.3v ?0%, t a = t min to t max . typical values are at t a = +25?, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units dc characteristics v l input voltage range v l 1.65 v cc + 0.3 v forceon = gnd forceoff = v l , all r in open 10 forceoff = gnd 10 ? v cc supply current, autoshutdown i cc forceon, forceoff = v l 1ma v cc supply current, autoshutdown disabled i cc forceon = forceoff = v l , no load 0.3 1 ma v l supply current t_in, i l forceon or forceoff = gnd or v l , v cc = v l = +5v, no receivers switching 1a logic inputs input-logic low t_in, forceon, forceoff 0.4 v input-logic high t_in, forceon, forceoff 0.66 ? v l v transmitter input hysteresis 0.5 v input leakage current t_in, forceon, forceoff ?.01 ? ? receiver outputs output leakage currents r_out, receivers disabled, forceoff = gnd or in autoshutdown ?0 ? output-voltage low i out = 0.8ma 0.4 v output-voltage high i out = -0.5ma v l - 0.4 v l - 0.1 v note 1: v+ and v- can have maximum magnitudes of 7v, but their absolute difference cannot exceed 13v.
max3230e/max3231e ?5kv esd-protected +2.5v to +5.5v rs-232 transceivers in ucsp _______________________________________________________________________________________ 3 electrical characteristics (continued) (v cc = +2.5v to +5.5v, v l = +1.65v to +5.5v, c1?4 = 0.1?, tested at +3.3v ?0%, t a = t min to t max . typical values are at t a = +25?, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units receiver inputs input voltage range -25 +25 v v cc = +3.3v 0.6 1.2 input-threshold low t a = +25? v cc = +5.0v 0.8 1.7 v v cc = +3.3v 1.3 2.4 input-threshold high t a = +25? v cc = +5.0v 1.8 2.4 v input hysteresis 0.5 v input resistance 357k ? automatic shutdown positive threshold 2.7 receiver input threshold to invalid output high figure 3a negative threshold -2.7 v receiver input threshold to invalid output low -0.3 +0.3 v receiver positive or negative threshold to invalid high t invh v cc = +5.0v, figure 3b 1 s receiver positive or negative threshold to invalid low t invl v cc = +5.0v, figure 3b 30 ? receiver edge to transmitters enabled t wu v cc = +5.0v, figure 3b 100 ? invalid output output-voltage low i out = 0.8ma 0.4 v output-voltage high i out = -0.5ma v cc - 0.4 v cc - 0.1 v transmitter outputs v cc mode switch point (v cc falling) t_out = ?.0v to ?.7v 2.85 3.10 v v cc mode switch point (v cc rising) t_out = ?.7v to ?.0v 3.3 3.7 v v c c m od e s w i tch- p oi nt h yster esi s 400 mv v cc = +3.1v to +5.5v, v cc falling, t a = +25? ? ?.4 output voltage swing all transmitter outputs loaded with 3k ? to ground v cc = +2.5v to +3.1v, v cc rising ?.7 v output resistance v cc = v+ = v- = 0, t_out = ?v 300 10m ? output short-circuit current ?0 ma output leakage current t_out = ?2v, transmitters disabled ?5 ? esd protection human body model ?5 iec 1000-4-2 air-gap discharge ?5 r_in, t_out iec 1000-4-2 contact discharge ? kv
max3230e/max3231e ?5kv esd-protected +2.5v to +5.5v rs-232 transceivers in ucsp 4 _______________________________________________________________________________________ note 2: v cc must be greater than v l . timing characteristics (v cc = +2.5v to +5.5v, v l = +1.65v to +5.5v, c1?4 = 0.1?, tested at +3.3v ?0%, t a = t min to t max . typical values are at t a = +25?, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units maximum data rate r l = 3k ? , c l = 1000pf, one transmitter switching 250 kbps receiver propagation delay receiver input to receiver output, c l = 150pf 0.15 ? receiver-output enable time v cc = v l = +5v 200 ns receiver-output disable time v cc = v l = +5v 200 ns transmitter skew | t phl - t plh | 100 ns receiver skew | t phl - t plh |50ns transition-region slew rate r l = 3k ? to 7k ? , c l = 150pf to 1000pf, t a = +25? 63 0 v/? t ypical operating characteristics (v cc = +3.3v, 250kbps data rate, 0.1? capacitors, all transmitters loaded with 3k ? and c l , t a = +25?, unless otherwise noted.) -6 -2 -4 2 0 4 6 0 1500 2000 500 1000 2500 3000 transmitter output voltage vs. load capacitance max3230/31e toc01 load capacitance (pf) transmitter output voltage (v) v oh v ol v cc rising 0 10 5 20 15 25 30 0 2500 3000 slew rate vs. load capacitance max3230/31e toc02 load capacitance (pf) slew rate (v/ s) 1000 500 1500 2000 v cc = 5.5v v cc = 2.5v 0 6 4 2 8 10 12 14 16 18 20 0 1000 500 1500 2000 2500 3000 operating supply current vs. load capacitance (max3231e) max3230/31e toc03 load capacitance (pf) operating supply current (ma) 250kbps 20kbps
max3230e/max3231e ?5kv esd-protected +2.5v to +5.5v rs-232 transceivers in ucsp _______________________________________________________________________________________ 5 bump max3230e max3231e name function a1 a1 v cc +2.5v to +5.5v supply voltage a2 a2 c2+ inverting charge-pump capacitor positive terminal a3 a3 c2- inverting charge-pump capacitor negative terminal a4 a4 v- negative supply voltage (-5.5v/-4.0v) generated by charge pump a5 a5 v l logic supply input. logic-level input for receiver outputs and transmitter inputs. connect v l to the system-logic supply voltage or v cc if no logic supply is required. a6, b6 a6 t_in transmitter input(s) b1 b1 v+ positive supply voltage (+5.5v/+4.0v) generated by charge pump. if charge pump is generating +4.0v, the device has switched from rs-232-compliant to rs-232- compatible mode. b2, b3, b4, c2, c3, c4, d2?5 b2, b3, b4, c2, c3, c4, d2?5 n.c. no connection. these locations are not populated with solder bumps. b5 b5 forceon active-high forceon input. drive forceon high to override automatic circuitry, keeping transmitters and charge pumps on. c1 c1 c1+ positive regulated charge-pump capacitor positive terminal c5 c5 forceoff active-low forceoff input. drive forceoff low to shut down transmitters, receivers, and on-board charge pump. this overrides all automatic circuitry and forceon. pin description t ypical operating characteristics (continued) (v cc = +3.3v, 250kbps data rate, 0.1? capacitors, all transmitters loaded with 3k ? and c l , t a = +25?, unless otherwise noted.) 0 6 4 2 8 10 12 14 16 18 20 2.5 3.5 3.0 4.0 4.5 5.0 5.5 operating supply current vs. supply voltage (max3231e) max3230/31e toc04 supply voltage (v) operating supply current (ma) -8 -4 -6 2 0 -2 8 6 4 10 2.5 3.5 3.0 4.0 4.5 5.0 5.5 transmitter output voltage vs. supply voltage (v cc rising) max3230/31e toc05 supply voltage (v) transmitter output voltage (v) v oh v ol -8 -4 -6 2 0 -2 8 6 4 10 2.5 3.5 3.0 4.0 4.5 5.0 5.5 transmitter output voltage vs. supply voltage (v cc falling) max3230/31e toc06 supply voltage (v) transmitter output voltage (v) v oh v ol
max3230e/max3231e ?5kv esd-protected +2.5v to +5.5v rs-232 transceivers in ucsp 6 _______________________________________________________________________________________ detailed description dual mode regulated charge-pump voltage converter the max3230e/max3231e internal power supply con- sists of a dual-mode regulated charge pump. for sup- ply voltages above +3.7v, the charge pump generates +5.5v at v+ and -5.5v at v-. the charge pumps oper- ate in a discontinuous mode. if the output voltages are less than ?.5v, the charge pumps are enabled. if the output voltages exceed ?.5v, the charge pumps are disabled. for supply voltages below +2.85v, the charge pump generates +4.0v at v+ and -4.0v at v-. the charge pumps operate in a discontinuous mode. if the output voltages are less than ?.0v, the charge pumps are enabled. if the output voltages exceed ?.0v, the charge pumps are disabled. each charge pump requires a flying capacitor (c1, c2) and a reservoir capacitor (c3, c4) to generate the v+ and v- supply voltages. voltage generation in the switchover region the max3230e/max3231e include a switchover circuit between these two modes that have approximately 400mv of hysteresis around the switchover point. the hysteresis is shown in figure 1 . this large hysteresis eliminates mode changes due to power-supply bounce. for example, a three-cell nimh battery system starts at v cc = +3.6v, and the charge pump generates an out- put voltage of ?.5v. as the battery discharges, the max3230e/max3231e maintain the outputs in regula- tion until the battery voltage drops below +3.1v. the output regulation points then change to ?.0v. when v cc is rising, the charge pump generates an out- put voltage of ?.0v, while v cc is between +2.5v and +3.5v. when v cc rises above the switchover voltage of +3.5v, the charge pump switches modes to generate an output of ?.5v. table 1 shows different supply schemes and their oper- ating voltage ranges. rs-232 transmitters the transmitters are inverting level translators that convert cmos logic levels to rs-232 levels. the max3230e/max3231e automatically reduce the rs-232-compliant levels (?.5v) to rs-232-compatible levels (?.0v) when v cc falls below approximately +3.1v. the reduced levels also reduce supply-current requirements, extending battery life. built-in hysteresis of approximately 400mv for v cc ensures that the rs- figure 1. v+ switchover for changing v cc 0 6v 4v 0 20ms/div v cc v+ dual mode is a trademark of maxim integrated products, inc. bump max3230e max3231e name function c6, d6 c6 r_out receiver output(s) d1 d1 c1- positive regulated charge-pump capacitor negative terminal e1 e1 gnd ground e2 e2 invalid valid signal-detector output. invalid is enabled low if no valid rs-232 level is present on any receiver input. e3, e4 e3 t_out rs-232 transmitter output(s) e5, e6 e5 r_in rs-232 receiver input(s) b6, d6, e4, e6 n.c. no connection. these locations are populated with solder bumps, but are electrically isolated. pin description (continued)
max3230e/max3231e ?5kv esd-protected +2.5v to +5.5v rs-232 transceivers in ucsp _______________________________________________________________________________________ 7 232 output levels do not change if v cc is noisy or has a sudden current draw causing the supply voltage to drop slightly. the outputs return to rs-232-compliant levels (?.5v) when v cc rises above approximately +3.5v. the max3230e/max3231e transmitters guarantee a 250kbps data rate with worst-case loads of 3k ? in par- allel with 1000pf. when forceoff is driven to ground, the transmitters and receivers are disabled and the outputs become high impedance. when the autoshutdown circuitry senses that all receiver and transmitter inputs are inac- tive for more than 30?, the transmitters are disabled and the outputs go to a high-impedance state. when the power is off, the max3230e/max3231e permit the transmitter outputs to be driven up to ?2v. the transmitter inputs do not have pullup resistors. connect unused inputs to gnd or v l . rs-232 receivers the max3230e/max3231e receivers convert rs-232 signals to logic-output levels. all receivers have invert- ing tri-state outputs and can be active or inactive. in shutdown ( forceoff = low) or in autoshutdown, the max3230e/max3231e receivers are in a high-imped- ance state ( table 2 ). the max3230e/max3231e feature an invalid output that is enabled low when no valid rs-232 signal levels have been detected on any receiver inputs. invalid is functional in any mode ( figures 2 and 3 ). autoshutdown the max3230e/max3231e achieve a 1? supply cur- rent with maxim? autoshutdown feature, which oper- ates when forceon is low and forceoff is high. when these devices sense no valid signal levels on all receiver inputs for 30?, the on-board charge pump and drivers are shut off, reducing v cc supply current to 1?. this occurs if the rs-232 cable is disconnected or the connected peripheral transmitters are turned off. the device turns on again when a valid level is applied to any rs-232 receiver input. as a result, the system saves power without changes to the existing bios or operating system. table 2 and figure 2c summarize the max3230e/ max3231e operating modes. forceon and forceoff override autoshutdown. when neither con- trol is asserted, the ic selects between these states automatically, based on receiver input levels. figures 2a, 2b , and 3a depict valid and invalid rs-232-receiver levels. figures 3a and 3b show the input levels and tim- ing diagram for autoshutdown operation. a system with autoshutdown can require time to wake up. figure 4 shows a circuit that forces the transmitters on for 100ms, allowing enough time for the other sys- tem to realize that the max3230e/max3231e are system supply (v) v cc (v) v l (v) rs-232 mode 1 li+ cell +2.4 to +4.2 regulated system voltage compliant/compatible 3 nicad/nimh cells +2.4 to +3.8 regulated system voltage compliant/compatible regulated voltage only (v cc falling) +3.0 to +5.5 +3.0 to +5.5 compliant regulated voltage only (v cc falling) +2.5 to +3.0 +2.5 to +3.0 compatible table 1. operating supply options table 2. output control truth table transceiver status forceon forceoff receiver status invalid shutdown (autoshutdown) low high high impedance low shutdown (forced off) x low high impedance ? normal operation (forced on) high high active ? normal operation (autoshutdown) low high active high x = don? care. ? = invalid output state is determined by r_in input levels.
active. if the other system transmits valid rs-232 sig- nals within that time, the rs-232 ports on both systems remain enabled. when shut down, the device? charge pumps are off, v+ is pulled to v cc , v- is pulled to ground, and the transmitter outputs are high impedance. the time required to exit shutdown is typically 100? ( figure 3b ). v l logic supply input unlike other rs-232 interface devices, where the receiv- er outputs swing between 0 and v cc , the max3230e/ max3231e feature a separate logic supply input (v l ) that sets v oh for the receiver outputs. the transmitter inputs (t_in), forceon, and forceoff , are also referred to v l . this feature allows maximum flexibility in interfacing to different systems and logic levels. connect v l to the system? logic supply voltage (+1.65v to +5.5v), and bypass it with a 0.1? capacitor to gnd. if the logic supply is the same as v cc , connect v l to v cc . always enable v cc before enabling the v l supply. v cc must be greater than or equal to the v l supply. software-controlled shutdown if direct software control is desired, connect forceoff and forceon together to disable autoshutdown. the microcontroller (?) then drives forceoff and forceon like a shdn input. invalid can be used to alert the ? to indicate serial data activity. ?5kv esd protection as with all maxim devices, esd-protection structures are incorporated on all pins to protect against electro- static discharges encountered during handling and assembly. the driver outputs and receiver inputs of the max3230e/max3231e have extra protection against static electricity. maxim? engineers have developed state-of-the-art structures to protect these pins against esd of ?5kv without damage. the esd structures withstand high esd in all states: normal operation, shut- down, and power-down. after an esd event, maxim? 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 trans- mitter outputs and receiver inputs of this product family are characterized for protection to the following limits: 1) ?5kv using the human body model 2) ?kv using the contact discharge method specified in iec 1000-4-2 3) ?5kv using the iec 1000-4-2 air-gap method 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 5a shows the human body model. figure 5b 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, max3230e/max3231e ?5kv esd-protected +2.5v to +5.5v rs-232 transceivers in ucsp 8 _______________________________________________________________________________________ figure 2a. max323_e entering 1? supply mode with autoshutdown +0.3v -0.3v invalid to max323 _e power supply and transmitters r_in transmitters are disabled, reducing supply current to 1 a if all receiver inputs are between +0.3v and -0.3v for at least 30 s. 30 s counter r figure 2b. max323_e with transmitters enabled using autoshutdown +2.7v -2.7v invalid to max323 _e power supply r_in transmitters are enabled if: any receiver input is greater than +2.7v or less than -2.7v. any receiver input has been between +0.3v and -0.3v for less than 30 s. 30 s counter r figure 2c. max323_e autoshutdown logic forceoff power down invalid forceon invalid is an internally generated signal that is used by the autoshutdown logic and appears as an output of the device. power down is only an internal signal. it controls the operational status of the transmitters and the power supplies. v cc
max3230e/max3231e ?5kv esd-protected +2.5v to +5.5v rs-232 transceivers in ucsp _______________________________________________________________________________________ 9 which is then discharged into the test device through a 1.5k ? resistor. iec 1000-4-2 the iec 1000-4-2 standard covers esd testing and per- formance of finished equipment. it does not specifically refer to ics. the max3230e/max3231e aid in designing equipment that meets level 4 (the highest level) of iec 1000-4-2, without the need for additional 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, because series resistance is lower in the iec 1000-4-2 model. hence, the esd with- stands voltage measured to iec 1000-4-2 and is gener- ally lower than that measured using the human body model. figure 6a shows the iec 1000-4-2 model, and figure 6b shows the current waveform for the ?kv iec 1000-4-2 level 4 esd contact discharge test. 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. its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufactur- ing. of course, all pins require this protection during manufacturing, not just rs-232 inputs and outputs. therefore, after pc board assembly, the machine model is less relevant to i/o ports. applications information capacitor selection the capacitor type used for c1?4 is not critical for proper operation; either polarized or nonpolarized capacitors can be used. however, ceramic chip capaci- tors with an x7r or x5r dielectric work best. the charge pump requires 0.1? capacitors for 3.3v operation. for other supply voltages, see table 3 for required capaci- tor values. do not use values smaller than those listed in table 3 . increasing the capacitor values (e.g., by a fac- tor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. c2, c3, and c4 can be increased without changing the vaue of c1. caution: 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 exces- sively with temperature. if in doubt, use capacitors with figure 3. autoshutdown trip levels v- v cc 0 v+ 0 v cc t invl t wu invalid region receiver input voltage (v) invalid output (v) t invh transmitters enabled, invalid high receiver input levels autoshutdown, transmitters disabled, 1 a supply current, invalid low transmitters enabled, invalid high a) b) -2.7v -0.3v +2.7v +0.3v 0 indeterminate indeterminate figure 4. autoshutdown with initial turn-on to wake up a mouse or another system forceon master shdn line 0.1 f1m ? forceoff max3230e max3231e power- management unit
max3230e/max3231e ?5kv esd-protected +2.5v to +5.5v rs-232 transceivers in ucsp a larger nominal value. the capacitor? 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 0.1? v cc bypass capacitor is adequate. in applications that are sensitive to power- supply noise, use a capacitor of the same value as the charge-pump capacitor c1. connect bypass capaci- tors as close to the ic as possible. transmitter outputs when exiting shutdown figure 7 shows a transmitter output when exiting shut- down mode. the transmitter is loaded with 3k ? in par- allel with 1000pf. the transmitter output displays no ringing or undesirable transients as it comes out of shutdown, and is enabled only when the magnitude of v- exceeds approximately -3v. high data rates the max3230e/max3231e maintain the rs-232 ?.0v minimum transmitter output voltage even at high data rates. figure 8 shows a transmitter loopback test cir- cuit. figure 9 shows a loopback test result at 120kbps, and figure 10 shows the same test at 250kbps. for figure 9 , the transmitter was driven at 120kbps into an rs-232 load in parallel with 1000pf. for figure 10 , a single transmitter was driven at 250kbps and loaded with an rs-232 receiver in parallel with 1000pf. charge-current- limit resistor discharge resistance storage capacitor c s 150pf r c 50m ? to 100m ? r d 330 ? high- voltage dc source device under test figure 6a. iec 1000-4-2 esd test model t r = 0.7ns to 1ns 30ns 60ns t 100% 90% 10% i peak i figure 6b. iec 1000-4-2 esd generator current waveform v cc (v) c1, c bypass (?) c2, c3, c4 (?) 2.5 to 3.0 0.22 0.22 3.0 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.22 1 table 3. required capacitor values 10 _____________________________________________________________________________________ charge-current- limit resistor discharge resistance storage capacitor c s 100pf r c 1m ? r d 1500 ? high- voltage dc source device under test figure 5a. human body esd test models 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 figure 5b. human body model current waveform
max3230e/max3231e ?5kv esd-protected +2.5v to +5.5v rs-232 transceivers in ucsp ucsp applications information for the latest application details on ucsp construction, dimensions, tape carrier information, pc board tech- niques, bump-pad layout, and recommended reflow tem- perature profile, as well as the latest information on reliability testing results, refer to the application note ucsp? wafer-level chip-scale package available on maxim? website at www.maxim-ic.com/ucsp. chip information transistor count: 698 process: cmos figure 8. transmitter loopback test circuit max3231e 5k ? r1in r1out c2- c2+ c1- c1+ v- v+ v cc v cc c4 c3 c1 c2 0.1 f 0.1 f forceoff forceon invalid t1out t1in gnd v l to power- management unit 1000pf v l v l v l v l figure 9. loopback test result at 120kbps 0 r_out t_out t_in -5v 5v 0 5v 5v 0 4 s/div figure 10. loopback test result at 250kbps 0 -5v 5v 0 5v 5v 0 r_out t_out t_in 4 s/div figure 7. transmitter outputs exiting shutdown or powering up forceon = forceoff t_out 4 s/div 0 2v/div 0 5v/div ______________________________________________________________________________________ 11
max3230e/max3231e ?5kv esd-protected +2.5v to +5.5v rs-232 transceivers in ucsp 12 ______________________________________________________________________________________ max3231e 5k ? r1in r1out ttl/cmos c2- c2+ c1- c1+ a1 a5 c1 d1 a2 a3 a6 c6 b1 a4 e3 e5 e2 e1 c5 b5 v- v+ v cc 2.5v to 5.5v c4 0.1 f c3 0.1 f c1 0.1 f c bypass c2 0.1 f 0.1 f 0.1 f forceoff forceon invalid t1out t1in gnd v l to power- management unit rs-232 v l v l v l 1.65v to 5.5v t ypical operating circuits (continued)
max3230e/max3231e ?5kv esd-protected +2.5v to +5.5v rs-232 transceivers in ucsp ______________________________________________________________________________________ 13 v cc 12 3456 c2+ c2- fon = forceon foff = forceoff inv = invalid v l t1in v+ n.c. n.c. fon n.c. t2in n.c. c1+ n.c. foff n.c. r2out c1- n.c. n.c. n.c. n.c. r1out gnd inv t1out t2out r2in a b c d e r1in v- max3230e top view pin configurations
max3230e/max3231e ?5kv esd-protected +2.5v to +5.5v rs-232 transceivers in ucsp 14 ______________________________________________________________________________________ v cc 12 3456 c2+ c2- fon = forceon foff = forceoff inv = invalid v l t1in v+ n.c. n.c. fon n.c. n.c. n.c. c1+ n.c. foff n.c. r1out c1- n.c. n.c. n.c. n.c. n.c. gnd inv t1out n.c. r1in a b c d e n.c. v- max3231e top view pin configurations (continued)
max3230e/max3231e ?5kv esd-protected +2.5v to +5.5v rs-232 transceivers in ucsp maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 15 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. 30l, ucsp 6x5 .eps g 1 1 21-0123 package ? outline, ? 6x5 ? ucsp package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .)

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