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max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown general description the max3221/max3223/max3243 achieve 1? supply current with maxim? revolutionary autoshutdown feature. when the max3221/max3223/max3243 do not sense a valid signal level on their receiver inputs, the on-board power supply and drivers shut down. this occurs if the rs-232 cable is disconnected or if the transmitters of the connected peripheral are turned off. the system turns on again when a valid level is applied to any rs-232 receiver input. the max3221/max3223/max3243 require only 0.1? capacitors in 3.3v operation, and can operate from input voltages ranging from +3.0v to +5.5v. a proprietary, high-efficiency, dual charge-pump power supply and a low-dropout transmitter combine to deliv- er true rs-232 performance from a single +3.0v to +5.5v supply. the max3221 is a 1-driver/1-receiver 16-pin ssop version of the 20-pin 2-driver/2-receiver max3223. the max3243 is a 3-driver/5-receiver with a comple- mentary always-active receiver for external monitoring in a variety of 28 pin packages. please see order information table for package offerings. applications battery-powered equipment hand-held equipment peripherals portable diagnostics equipment benefits and features integrated charge pump circuitry simplifies power requirements ? eliminates the need for a ?2 supply ? operation from a single +3.3v or +5v supply 1? supply current in shutdown mode saves power ? autoshutdown feature is enabled after no activity on receiver inputs for 30? ? software control option for shutdown 19-0306; rev 9; 1/15 part max3221cae max3221eue ? -40? to +85? 0? to +70? temp range pin-package 16 ssop 16 tssop ? future product?ontact factory for availability. autoshutdown and ucsp are trademarks of maxim integrated products, inc. pin configurations appear at end of data sheet. typical operating circuits appear at end of data sheet. max3223epp -40? to +85? 20 plastic dip max3223eap -40? to +85? 20 ssop max3243cwi 0? to +70? 28 wide so max3243cai 0? to +70? 28 ssop max3243ewi -40? to +85? 28 wide so max3243eai -40? to +85? 28 ssop max3223cpp max3223cap 0? to +70? 0? to +70? 20 plastic dip 20 ssop ordering information selector guide max3221 max3223 max3243 1 2 3 1 2 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 5 yes yes yes part tx rx v cc range (v) autoshutdown max3221cue ? 0? to +70? 16 tssop max3221eae -40? to +85? 16 ssop max3223cup 0? to +70? 20 tssop MAX3223EUP -40? to +85? 20 tssop max3243cui 0? to +70? 28 tssop max3243eui -40? to +85? 28 tssop
maxim integrated | 2 www.maximintegrated.com max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown absolute maximum ratings electrical characteristics (v cc = +3.0v to +5.5v, c1?4 = 0.1? (note 2), t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) 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 ...........................................................................-0.3v to +6v v+ (note 1) ...............................................................-0.3v to +7v v- (note 1) ...............................................................+0.3v to -7v v+ + | v- | (note 1).................................................................+13v input voltages t_in, forceoff , forceon, en (max3223) ......-0.3v to +6v r_in ...................................................................................?5v output voltages t_out.............................................................................?3.2v r_out, invalid ......................................-0.3v to (v cc + 0.3v) short-circuit duration t_out ......................................................................continuous continuous power dissipation (t a = +70?) 16-pin ssop (derate 7.14mw/? above +70?) ...........571mw 16-pin tssop (derate 6.70mw/? above +70?) .........533mw 20-pin plastic dip (derate 11.11mw/? above +70?)....889mw 20-pin ssop (derate 8.00mw/? above +70?) ...........640mw 20-pin tssop dip (derate 7.00mw/? above +70?).....559mw 28-pin wide so (derate 12.50mw/? above +70?) ............1w 28-pin ssop (derate 9.52mw/? above +70?) ...........762mw 28-pin tssop (derate 8.70mw/? above +70?) .........696mw operating temperature ranges max32_ _c_ _.......................................................0? to +70? max32_ _e_ _ ....................................................-40? to +85? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? note 1: v+ and v- can have maximum magnitudes of 7v, but their absolute difference cannot exceed 13v. i out = 1.6ma receivers disabled t_in, en, forceon, forceoff t_in, en, forceon, forceoff t_in, forceon, forceoff , en (max3223) i out = -1.0ma conditions v v cc - 0.6 v cc - 0.1 output voltage high v 0.4 output voltage low ? ?.05 ?0 output leakage current ? ?.01 ?.0 input leakage current v 2.4 input logic threshold high ? 1.0 10 v 0.8 input logic threshold low units min typ max parameter v cc = 3.3v v cc = 5.0v 2.0 supply current, autoshutdown supply current, shutdown ? 1.0 10 supply current, autoshutdown disabled v cc = 3.3v or 5.0v, t a = +25? ma 0.3 1.0 2.7 receiver positive or negative threshold to invalid high (t invh ) figure 5 ? 1 receiver threshold to transmitters enabled (t wu ) figure 5 ? 250 receiver positive or negative threshold to invalid low (t invl ) figure 5 ? 30 receiver input thresholds to transmitters enabled figure 5 v -2.7 invalid output voltage low i out = 1.6ma v 0.4 receiver input thresholds to transmitters disabled 1? supply current, figure 5 v -0.3 0.3 positive threshold negative threshold invalid output voltage high i out = -1.0ma v v cc - 0.6 dc characteristics logic inputs and receiver outputs autoshutdown (forceon = gnd, forceoff = v cc ) all r_in open, forceon = gnd, forceoff = v cc forceoff = gnd forceon = forceoff = v cc , no load
max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown maxim integrated | 3 www.maximintegrated.com electrical characteristics (continued) (v cc = +3.0v to +5.5v, c1?4 = 0.1? (note 2), t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) note 2: c1?4 = 0.1?, tested at 3.3v 10%. c1 = 0.047?, c2?4 = 0.33?, tested at 5.0v 10%. 200 normal operation 200 receiver output enable time normal operation ns t plh receiver input to receiver output, c l = 150pf 4 8.0 30 transition-region slew rate v/? v cc = 3.3v, r l = 3k to 7k , t a = +25?, measured from +3v to -3v or -3v to +3v transmitter skew 200 ns ? t phl - t plh ? parameter min typ max units ?5 output short-circuit current ?5 60 ma output resistance 300 10m output leakage current ? input threshold low 0.6 1.2 v ?.0 ?.4 output voltage swing v maximum data rate 120 235 kbps receiver propagation delay 0.3 ? conditions v cc = v+ = v- = 0v, transmitter output = ?v v out = ?2v, v cc = 0v or 3.0v to 5.5v, transmitters disabled r l = 3k , c l = 1000pf, one transmitter switching all transmitter outputs loaded with 3k to ground ns receiver output disable time t phl 0.3 input voltage range -25 25 v input hysteresis 0.3 v input threshold high v input resistance 35 7 k t a = +25? 0.8 1.5 1.8 2.4 1.5 2.4 t a = +25? t a = +25? v cc = 3.3v v cc = 3.3v v cc = 5.0v v cc = 5.0v c l = 200pf to 2500pf c l = 200pf to 1000pf 630 ? transmitter output voltage v t1in = t2in = gnd, t3in = v cc , t3out loaded with 3k to gnd, t1out and t2out loaded with 2.5ma each max3221/max3223 max3243 200 1000 receiver skew 100 ns ? t phl - t plh ? max3221/max3223 max3243 100 500 receiver inputs timing characteristics transmitter outputs mouse driveability (max3243)
maxim integrated | 4 www.maximintegrated.com max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown typical operating characteristics (v cc = +3.3v, 235kbps data rate, 0.1? capacitors, all transmitters loaded with 3k , t a = +25?, unless otherwise noted.) -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 0 max3221/max3223 transmitter output voltage vs. load capacitance max3221/3223-01 load capacitance (pf) transmitter output voltage (v) 2000 3000 1000 4000 5000 v out+ v out- 0 2 4 6 8 10 12 14 16 18 20 22 150 500 max3221/max3223 slew rate vs. load capacitance max3221/3223-02 load capacitance (pf) slew rate (v/ s) 2000 3000 1000 4000 5000 for data rates up to 235kbps +slew -slew 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 0 max3221/max3223 supply current vs. load capacitance when transmitting data max3221/3223-03 load capacitance (pf) 3 3 su cu ( ) max3221 supply current (ma) 2000 3000 1000 4000 5000 235kbps 120kbps 20kbps -7.5 -5.0 -2.5 0 2.5 5.0 7.5 0 max3243 transmitter output voltage vs. load capacitance max3221/3223-04 load capacitance (pf) transmitter output voltage (v) 2000 3000 1000 4000 5000 v out + 1 transmitter at 235kbps 2 transmitters at 30kbps v out - all outputs loaded with 3k +c l 0.1 f charge-pump capacitors for all data rates up to 235kbps 4 6 8 10 12 14 16 18 20 22 24 0 max3243 slew rate vs. load capacitance max3221/3223-05 load capacitance (pf) slew rate (v/ s) 2000 3000 1000 4000 5000 +slew -slew 0 5 10 15 20 25 30 35 45 40 0 max3243 supply current vs. load capacitance when transmitting data max3221/3223-06 load capacitance (pf) supply current (ma) 2000 3000 1000 4000 5000 235kbps 120kbps 20kbps
maxim integrated | 5 www.maximintegrated.com max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown pin description noninverting receiver output?ctive in shutdown r2outb output of the valid signal detector. indicates if a valid rs-232 level is pres- ent on receiver inputs logic ?? invalid drive low to shut down transmitters and on-board power supply. this over- rides all automatic circuitry and forceon (table 1). forceoff drive high to override automatic circuitry keeping transmitters on ( forceoff must be high) (table 1). forceon negative terminal of the voltage doubler charge-pump capacitor c1- rs-232 receiver inputs r_in rs-232 transmitter outputs t_out ttl/cmos transmitter inputs t_in ttl/cmos receiver outputs r_out -5.5v generated by the charge pump v- negative terminal of inverting charge-pump capacitor c2- positive terminal of inverting charge-pump capacitor c2+ receiver enable control. drive low for normal operation. drive high to force the receiver outputs into a high-z state. en function ground gnd +3.0v to +5.5v supply voltage v cc laplink is a trademark of traveling software. detailed description dual charge-pump voltage converter the max3221/max3223/max3243? internal power supply consists of a regulated dual 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 disabled. 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 con- vert cmos-logic levels to 5.0v eia/tia-232 levels. they guarantee a 120kbps data rate with worst-case loads of 3k in parallel with 1000pf, providing compatibility with pc-to-pc communication software (such as laplink). typically, the max3221/max3223/max3243 can oper- ate at data rates of 235kbps. transmitters can be paral- leled to drive multiple receivers or mice (max3243). figure 1 shows a complete system connection. when forceoff is driven to ground, or the auto- shutdown circuitry senses invalid voltage levels at all receiver inputs, the transmitters are disabled and the outputs are forced into a high-impedance state. 10 16 12 4 8 13 11 9 7 6 5 1 14 15 name max3221 +5.5v generated by the charge pump v+ 3 positive terminal of the voltage doubler charge-pump capacitor c1+ 2 11 20 14 4 9, 16 8, 17 12, 13 10, 15 7 6 5 1 18 19 20 21 22 23 24 4? 9, 10, 11 12, 13, 14 15?9 3 2 1 25 26 max3223 3 max3243 27 2 28 pin
maxim integrated | 6 www.maximintegrated.com max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown rs-232 receivers the max3221/max3223/max3243? receivers convert rs-232 signals to cmos-logic output levels. all receivers have one inverting three-state output. in shut- down ( forceoff = low) or in autoshutdown, the max3221/max3223? receivers are active (table 1). driving en high places the receiver(s) in a high-imped- ance state. the max3243? receivers are high imped- ance when the part is shut down. the max3243 has an always-active complementary output (r2outb). r2outb is an extra output that mon- itors receiver activity while the other receivers are high impedance. this allows ring indicator to be monitored without forward biasing other devices connected to the receiver outputs. this is ideal for systems where v cc is set to 0v in shutdown to accommodate peripherals, such as uarts (figure 2). max3243 i/o chip with uart cpu rs-232 power management unit or keyboard controller forceoff forceon invalid max3243 t1out r2outb tx 5k uart v cc t1in three-stated logic transition detector r2in protection diode r2out forceoff = gnd v cc to p rx previous rs-232 tx uart shdn = gnd v cc v cc gnd rx 5k (a) older rs-232: powered-down uart draws current from active receiver output in shutdown. (b) new max3243: in shutdown, r2outb is used to monitor external devices and r2out is three stated, eliminating a current path through the uart's protection diode. gnd protection diode i i figure 1. interface under control of pmu figure 2. the max3243 detects rs-232 activity when the uart and interface are shut down.
max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown maxim integrated | 7 www.maximintegrated.com autoshutdown a 1? supply current is achieved with maxim? new autoshutdown feature, which operates when forceon is low and forceoff is high. when the max3221/max3223/max3243 sense no valid signal levels on all receiver inputs for 30?, the on-board power supply and drivers are shut off, reducing supply current to 1?. this occurs if the rs-232 cable is dis- connected or the connected peripheral transmitters are turned off. the system 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. when using autoshutdown, the invalid output is high when the device is on and low when the device is shut down. because i nvalid indicates the receiver inputs?condition, it can be used in any mode (figure 3). table 2 and figure 3c summarize the max3221/ max3223/max3243 operating modes. forceon and forceoff override the automatic circuitry and force the transceiver into its normal operating state or into its low-power standby state. when neither control is assert- ed, the ic selects between these states automatically based on receiver input levels. figures 3a, 3b, and 5a depict valid and invalid rs-232 receiver levels. a mouse or other system with autoshutdown may need time to wake up. figure 4 shows a circuit that forces the transmitters on for 100ms, allowing enough time for the other system to realize that the max3221/max3223/ table 1a. max3221/max3223 f f o o r r c c e e o o f f f f and enable control truth table table 1b. max3243 f f o o r r c c e e o o f f f f control truth table active* 1 1 active* 0 1 f f o o r r c c e e o o f f f f high-z 1 0 high-z 0 0 t_out e e n n high-z active high-z active r_out +0.3v -0.3v invalid to max32_ _ 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? counter r active* 1 high-z 0 t_out f f o o r r c c e e o o f f f f active* high-z r_out active active r2outb figure 3a. max32_ _ entering 1? supply mode via autoshutdown * note: if the part is in autoshutdown mode ( forceoff = v cc , forceon = gnd), it is shut down if no valid rs-232 levels are present on all receiver inputs. forceon master shdn line 0.1 f1m forceoff max3221 max3223 max3243 power management unit figure 4. autoshutdown with initial turn-on to wake up a mouse or another system +2.7v -2.7v invalid to max32_ _ 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? counter r figure 3b. max32_ _ with transmitters enabled using autoshutdown 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. figure 3c. autoshutdown logic
maxim integrated | 8 www.maximintegrated.com max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown max3243 is awake. if the other system outputs valid rs-232 signals within that time, the rs-232 ports on both systems remain enabled. when shut down, the device? charge pumps are turned off, v+ decays to v cc , v- decays to ground, and the transmitter outputs are disabled (high impedance). the time required to exit shutdown is typically 100? (figure 5b). software-controlled shutdown if direct software control is desired, invalid can be used to indicate dtr or ring indicator signal. tie forceoff and forceon together to bypass auto- shutdown so the line acts like a shdn input. applications information capacitor selection the capacitor type used for c1?4 is not critical for proper operation; either polarized or nonpolarized capacitors may be used. the charge pump requires 0.1? capacitors for 3.3v operation. for other supply voltages, refer to table 3 for required capacitor values. do not use values smaller than those listed in table 3. increasing the capacitor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. c2, c3, and c4 can be increased without changing c1? 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 capaci- tors with a larger nominal value. the capacitor? equiva- lent series resistance (esr) usually rises at low temperatures and influences the amount of ripple on v+ and v-. table 2. autoshutdown logic rs-232 signal present at receiver input f f o o r r c c e e o o f f f f input forceon input i i n n v v a a l l i i d d output transceiver status yes h x h normal operation no h h l normal operation (forced on) no h l l shutdown (autoshutdown) yes l x h shutdown (forced off) no l x l shutdown (forced off) 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 -2.7v -0.3v +2.7v +0.3v 0v indeterminate indeterminate (b) (a) figure 5. autoshutdown trip levels
max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown maxim integrated | 9 www.maximintegrated.com power-supply decoupling in most circumstances a 0.1? bypass capacitor is adequate. in applications that are sensitive to power- supply 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 6 shows two transmitter outputs when exiting shutdown mode. as they become active, the two trans- mitter 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 shut- down. note that the transmitters are enabled only when the magnitude of v- exceeds approximately 3v. figure 7a shows the max3243? transmitter output voltage vs. current per transmitter. figure 7b is a mouse driver test circuit. mouse driveability (max3243) the max3243 has been specifically designed to power serial mice while operating from low-voltage power sup- plies. it has been tested with samples of ten major mouse models from six manufacturers including the leading three: logitech (5 models), mouse systems, and microsoft. the max3243 successfully drove all serial mice and met their respective current and voltage requirements. figure 7a shows the transmitter outputs under increasing load current. the max3243? switching regulator ensures the transmitters will supply at least 5v during worst-case conditions. the autoshutdown feature does not work with a mouse, so forceoff and forceon should be connected to v cc . high data rates the max3221/max3223/max3243 maintain the rs-232 ?.0v minimum transmitter output voltage even at high data rates. figure 8 shows a transmitter loopback test circuit. figure 9 shows a loopback test result at 120kbps, and figure 10 shows the same test at 235kbps. for figure 9, all three transmitters were driv- en simultaneously at 120kbps into rs-232 loads in par- allel with 1000pf. for figure 10, a single transmitter was driven at 235kbps, but all three transmitters were loaded with an rs-232 receiver in parallel with 1000pf. interconnection with 3v and 5v logic the max3221/max3223/max3243 can directly inter- face with various 5v logic families, including act and hct cmos. see table 4 for more information on possi- ble combinations of interconnections. -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 01234567 max32 2 load current per transmitter (ma) transmitter output voltage (v) v out + v cc = 3.0v v out - v out + v cc v out - t 1 t 2 t 3 figure 7a. max3243 transmitter output voltage vs. load current per transmitter 5v/div v cc = +3.3v c1?4 = 0.1 f 2v/div t2 50 s/div t1 figure 6. transmitter outputs when exiting shutdown or powering up
maxim integrated | 10 www.maximintegrated.com max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown +v computer serial port +v -v gnd tx serial mouse max3243 forceoff 23 r5out 15 r4out 16 r3out 17 r2out 18 r1out 19 r2outb 20 logic outputs 5k 5k 5k 5k 5k r5in 8 r4in 7 r3in 6 r2in 5 r1in 4 rs-232 inputs gnd 25 logic inputs t3in 12 t2in 13 t1in 14 c2- 2 c2+ 1 c1- 24 c1+ 28 t3out 11 t2out 10 t1out 9 v- 3 v+ 27 v cc v cc c4 0.1 f c3 0.1 f 0.1 f 26 c1 0.1 f c2 0.1 f forceon invalid 22 21 to power management unit +3.3v figure 7b. mouse driver test circuit
max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown maxim integrated | 11 www.maximintegrated.com figure 10. loopback test result at 235kbps t1in r1out v cc = +3.3v, 235kbps c1?4 = 0.1 f t1out 5v/div 5v/div 2 s/div 5v/div max3221 max3223 max3243 5k r_ in r_ out en (max3221/3) c2- c2+ c1- c1+ v- v+ v cc c4 c3 c1 c2 0.1 f v cc forceoff t_ out t_ in gnd v cc 0v 1000pf figure 8. loopback test circuit figure 9. loopback test result at 120kbps t1in r1out v cc = +3.3v, 120kbps c1?4 = 0.1 f t1out 5v/div 5v/div 5v/div 5 s/div table 4. logic family compatibility with various supply voltages table 3. required capacitor values v cc supply voltage (v) compatibility 3.3 3.3 compatible with all cmos families. 5 5 compatible with all ttl and cmos-logic families. system power- supply voltage (v) 5 3.3 compatible with act and hct cmos, and with ttl. incompatible with ac, hc, or cd4000 cmos. v cc (v) c1 (f) c2, c3, c4 (f) 3.0 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.1 0.47
maxim integrated | 12 www.maximintegrated.com max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown typical operating circuits max3221 forceon en 12 1 r1out 9 forceoff 16 invalid 10 gnd 14 t1in 11 c2- 6 c2+ 5 c1- 4 c1+ 2 r1in 8 t1out 13 v- 7 v+ 3 v cc v cc c4 0.1 f c3 0.1 f 0.1 f 15 c1 0.1 f c2 0.1 f c5 +3.3v to power management unit 5k max3223 forceon en 14 1 r2out 10 r1out 15 forceoff 20 invalid 11 r2in 9 gnd 18 rs-232 outputs ttl/cmos inputs t2in 12 t1in 13 c2- 6 c2+ 5 c1- 4 c1+ 2 r1in 16 t2out 8 t1out 17 v- 7 v+ 3 v cc v cc c4 0.1 f c3 0.1 f 0.1 f 19 c1 0.1 f c2 0.1 f c5 +3.3v rs-232 inputs to power management unit ttl/cmos outputs 5k 5k max3243 forceoff 23 r5out 15 r4out 16 r3out 17 r2out 18 r1out 19 r2outb 20 logic outputs 5k 5k 5k 5k 5k r5in 8 r4in 7 r3in 6 r2in 5 r1in 4 rs-232 inputs gnd 25 rs-232 outputs logic inputs t3in 12 t2in 13 t1in 14 c2- 2 c2+ 1 c1- 24 c1+ 28 t3out 11 t2out 10 t1out 9 v- 3 v+ 27 v cc v cc c4 0.1 f c3 0.1 f 0.1 f 26 c1 0.1 f c2 0.1 f forceon invalid 22 21 to power management unit +3.3v
max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown maxim integrated | 13 www.maximintegrated.com 3v-powered eia/tia-232 and eia/tia-562 transceivers from maxim 0.1? capacitors, max242 pinout 232 120 2 2/2 3.0 to 5.5 max3222 0.1? capacitors, autoshutdown 232 120 2 2/2 3.0 to 5.5 max3223 0.1? capacitors, autoshutdown complementary receiver, drives mice 232 120 1 3/5 3.0 to 5.5 max3243 0.1? capacitors, max232 pinout 232 120 n/a 2/2 3.0 to 5.5 max3232 0.1? capacitors, 16-pin ssop 232 120 1 1/1 3.0 to 5.5 max3221 232 562 232 562 232 eia/tia- 232 or 562 2.7 to 3.6 autoshutdown, complementary receiver, drives mice, transient detection 235 5 3/5 max3212 0.1? capacitors 120 2 2/2 3.0 to 3.6 max563 operates directly from batteries without a voltage regulator 120 2 2/2 1.8 to 4.25 max218 no. of receivers active in shutdown power- supply voltage (v) 230kbps guaranteed data rate 230 5 3/5 2.7 to 5.25 max562 drives mice 120 5 3/5 3.0 to 3.6 max212 features guar- anteed data rate (kbps) no. of transmitters/ receivers part 0.1? capacitors, 2 complemen- tary receivers, drives mice 232 120 5 3/5 3.0 to 5.5 max3241
maxim integrated | 14 www.maximintegrated.com max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown pin configurations 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 forceoff v cc gnd t1out c1- v+ c1+ en r1in r1out forceon t1in t2out v- c2- c2+ 12 11 9 10 t2in invalid r2out r2in dip/ssop/tssop max3223 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 c1+ v+ v cc gnd c1- forceon forceoff invalid r2outb r1out r2out r3out r4out r5out c2+ c2- v- r1in r2in r3in r4in r5in t1out t2out t3out t3in t2in t1in so/ssop/tssop max3243 top view 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 en c1+ v+ c1- c2+ c2- v- r1in forceoff v cc gnd t1out forceon t1in invalid r1out max3221 ssop/tssop
max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown maxim integrated | 15 www.maximintegrated.com ssop.eps package outline, ssop, 5.3 mm 1 1 21-0056 c rev. document control no. approval proprietary information title: notes: 1. d&e do not include mold flash. 2. mold flash or protrusions not to exceed .15 mm (.006"). 3. controlling dimension: millimeters. 4. meets jedec mo150. 5. leads to be coplanar within 0.10 mm. 7.90 h l 0 0.301 0.025 8 0.311 0.037 0 7.65 0.63 8 0.95 max 5.38 millimeters b c d e e a1 dim a see variations 0.0256 bsc 0.010 0.004 0.205 0.002 0.015 0.008 0.212 0.008 inches min max 0.078 0.65 bsc 0.25 0.09 5.20 0.05 0.38 0.20 0.21 min 1.73 1.99 millimeters 6.07 6.07 10.07 8.07 7.07 inches d d d d d 0.239 0.239 0.397 0.317 0.278 min 0.249 0.249 0.407 0.328 0.289 max min 6.33 6.33 10.33 8.33 7.33 14l 16l 28l 24l 20l max n a d e a1 l c h e n 1 2 b 0.068 tssop4.40mm.eps 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 per tains to the package regardless of rohs status.
maxim integrated | 16 www.maximintegrated.com max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown soicw.eps package outline, .300" soic 1 1 21-0042 b rev. document control no. approval proprietary information title: top view front view max 0.012 0.104 0.019 0.299 0.013 inches 0.291 0.009 e c dim 0.014 0.004 b a1 min 0.093 a 0.23 7.40 7.60 0.32 millimeters 0.10 0.35 2.35 min 0.49 0.30 max 2.65 0.050 0.016 l 0.40 1.27 0.512 0.496 d d min dim d inches max 12.60 13.00 millimeters min max 20 ac 0.447 0.463 ab 11.75 11.35 18 0.398 0.413 aa 10.50 10.10 16 n ms013 side view h 0.419 0.394 10.00 10.65 e 0.050 1.27 d 0.614 0.598 15.20 24 15.60 ad d 0.713 0.697 17.70 28 18.10 ae h e n d a1 b e a 0-8 c l 1 variations: pdipn.eps package information (continued) 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 per tains to the package regardless of rohs status.
maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integr ated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifications without notice 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. 2015 maxim integrated products , inc. | 17 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds web site at www.maximintegrated.com. max3221/max3223/max3243 +3v to +5.5v rs-232 transceivers with autoshutdown revision history revision number revision date description pages changed 9 1/15 updated general description and benefits and features sections 1

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