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1 tm file number 6003.1 caution: these devices are sensitive to electrostatic discharge; follow proper ic handling procedures. 1-888-intersil or 321-724-7143 | intersil and design is a trademark of intersil americas inc. copyright ? intersil americas inc. 2001, all rights reserved ICL3237 1 microamp supply-current, +3v to +5.5v, 1mbps, rs-232 transmitters/receivers the intersil ICL3237 contains 3.0v to 5.5v powered rs-232 transmitters/receivers which meet ela/tia-232 and v.28/v.24 specifications, even at v cc = 3.0v. targeted applications are cell phones, pdas, palmtops, and notebook and laptop computers where the low operational, and even lower standby, power consumption is critical. efficient on- chip charge pumps, coupled with manual powerdown function, reduce the standby supply current to a 1 atrickle. small footprint packaging, and the use of small, low value capacitors ensure board space savings as well. data rates greater than 1mbps (mbaud = v cc ) are guaranteed at worst case load conditions. this family is fully compatible with 3.3v only systems, mixed 3.3v and 5.0v systems, and 5.0v only systems. the ICL3237 is a 5 driver, 3 receiver device that also includes a noninverting always-active receiver for ?wake-up? capability. table 1 summarizes the features of the device represented by this data sheet, while application note an9863 summarizes the features of each device comprising the icl32xx 3v family. features drop in replacement for max3237 meets eia/tia-232 and v.28/v.24 specifications at 3v latch-up free on-chip voltage converters require only four external capacitors manual powerdown features flow through pinout receiver hysteresis for improved noise immunity pinselectabledatarate guaranteedminimumdatarate....... 250kbps/1mbps guaranteedminimumslewrate.......6v/ sor24v/ s wide power supply range . . . .... single+3vto+5.5v low supply current in powerdown state ...........1 a applications any system requiring rs-232 communication ports - battery powered, hand-held, and portable equipment - laptop computers, notebooks, palmtops - modems, printers and other peripherals - digital cameras - cellular/mobile phone related literature technical brief tb363 ?guidelines for handling and processing moisture sensitive surface mount devices (smds)? an9863 ?3v to +5.5v, 250k-1mbps, rs-232 transmitters/receivers? ordering information part no. temp. range ( o c) package pkg. no. ICL3237ca 0 to 70 28 ld ssop m28.209 ICL3237ca-t 0 to 70 tape and reel m28.209 ICL3237ia -40 to 85 28 ld ssop m28.209 ICL3237ia-t -40 to 85 tape and reel m28.209 table 1. summary of features part number no. of tx. no. of rx. no. of monitor rx. (r outb ) (note 1) data rate (kbps) rx. enable function? ready output? manual power- down? automatic powerdown function? ICL3237 5 3 1 250/1000 yes no yes no note: 1. data rate is selectable via the mbaud pin. data sheet july 2001 itle l32 ) bjec croa pply rren 3v .5v, bps s- 2 ns tters ecei rs) utho ) eyw s tersi rpor on, ico ucto ow wer, h ed, ltage v, ,
2 pinout ICL3237 (ssop) top view c2+ gnd c2- v- t1 out t2 out t3 out r1 in r2 in r3 in t5 out en shdn c1+ v cc c1- t1 in t2 in r1 out t4 in r3 out t5 in r1 outb mbaud v+ t3 in r2 out 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 t4 out pin descriptions pin function v cc system power supply input (3.0v to 5.5v). v+ internally generated positive transmitter supply (+5.5v). v- internally generated negative transmitter supply (-5.5v). gnd ground connection. c1+ external capacitor (voltage doubler) is connected to this lead. c1- external capacitor (voltage doubler) is connected to this lead. c2+ external capacitor (voltage inverter) is connected to this lead. c2- external capacitor (voltage inverter) is connected to this lead. t in ttl/cmos compatible transmitter inputs. t out rs-232 level (nominally 5.5v) transmitter outputs. r in rs-232 compatible receiver inputs. r out ttl/cmos level receiver outputs. r outb ttl/cmos level, noninverting, always enabled receiver output. en active low receiver enable control; doesn?t disable r outb output. shdn active low input to shutdown transmitters and on-board power supply, to place device in low power mode. mbaud input low selects 250kbps data rate, and input high selects 1mbps data rate. ICL3237
3 typical operating circuit ICL3237 26 v cc t1 out t2 out t3 out t1 in t2 in t3 in t 1 t 2 t 3 0.1 f + 0.1 f + 0.1 f 24 23 5 6 22 7 28 25 27 4 v+ v- c1+ c1- c2+ c2- + 0.1 f 1 3 r1 out r1 in 8 5k ? r2 out r2 in 9 20 5k ? r3 out r3 in 11 18 5k ? 21 r1 outb c 1 c 2 + c 3 c 4 en shdn 13 gnd 14 +3.3v + 0.1 f 16 2 v cc ttl/cmos logic levels rs-232 levels rs-232 levels r 1 r 2 r 3 15 mbaud to control logic + c 3 (optional connection, note) note: the negative terminal of c 3 can be connected to either v cc or gnd. t4 out t5 out t4 in t5 in t 4 t 5 19 10 17 12 ICL3237
4 absolute maximum ratings thermal information v cc toground................................ -0.3vto6v v+toground................................. -0.3vto7v v-toground................................. +0.3vto-7v v+tov- ........................................... 14v input voltages t in ,en , shdn .............................. -0.3vto6v mbaud ............................. -0.3vtov cc +0.3v r in ............................................ 25v output voltages t out ......................................... 13.2v r out ...............................-0.3vtov cc +0.3v short circuit duration t out ..................................... continuous esdrating .........................seespecificationtable thermal resistance (typical, note 2) ja ( o c/w) 28ldssoppackage ....................... 100 moisture sensitivity (see technical brief tb363) allpackages ...................................level1 maximum junction temperature (plastic package) . . . . . . . 150 o c maximumstoragetemperaturerange.......... -65 o cto150 o c maximum lead temperature (soldering 10s) . . . . . . . . . . . . 300 o c (lead tips only) operating conditions temperature range ICL3237c.................................0 o cto70 o c ICL3237i................................. -40 o cto85 o c caution: stresses above those listed in ?absolute maximum ratings? may cause permanent damage to the device. this is a stress only rating and operatio nofthe device at these or any other conditions above those indicated in the operational sections of this specification is not implied. note: 2. ja is measured with the component mounted on a low effective thermal conductivity test board in free air. see tech brief tb379 for details. electrical specifications test conditions: v cc =3v,c 1 -c 4 =0.22 f; v cc = 3.15v to 5.5v, c 1 -c 4 =0.1 f, unless otherwise specified. typicals are at t a =25 o c parameter test conditions temp ( o c) min typ max units dc characteristics supply current, powerdown disabled all outputs unloaded, v cc = 3.15v, shdn =v cc 25 - 0.3 1.0 ma supply current, powerdown shdn =gnd 25 - 1.0 10 a logic and transmitter inputs and receiver outputs input logic threshold low t in ,en , shdn , mbaud full - - 0.8 v input logic threshold high t in ,en , shdn , mbaud v cc =3.3v full 2.0 - - v v cc =5.0v full 2.4 - - v transmitter input hysteresis 25 - 0.5 - v input leakage current t in ,en , shdn , mbaud full - 0.01 1.0 a output leakage current en =v cc (receivers disabled) full - 0.05 10 a output voltage low i out =1.6ma full - - 0.4 v output voltage high i out = -1.0ma full v cc -0.6 v cc -0.1 - v receiver inputs input voltage range full -25 - 25 v input threshold low v cc = 3.3v 25 0.6 1.2 - v v cc = 5.0v 25 0.8 1.5 - v input threshold high v cc = 3.3v to 5.0v 25 - 1.6 2.4 v input hysteresis 25 - 0.3 - v input resistance 25 3 5 7 k ? transmitter outputs output voltage swing all transmitter outputs loaded with 3k ? to ground full 5.0 5.4 - v ICL3237
5 detailed description the ICL3237 operates from a single +3v to +5.5v supply, guarantees a 1mbps minimum data rate, requires only four small external 0.1 f capacitors, features low power consumption, and meets all eia/tia-232 and v.28 specifications. the circuit is divided into three sections: the charge pump, the transmitters, and the receivers. charge-pump intersil?s new icl32xx family utilizes regulated on-chip dual charge pumps as voltage doublers, and voltage inverters to generate 5.5v transmitter supplies from a v cc supply as low as 3.0v. this allows these devices to maintain rs-232 compliant output levels over the 10% tolerance range of 3.3v powered systems. the efficient on-chip power supplies require only four small, external 0.1 f capacitors for the voltage doubler and inverter functions at v cc =3.3v.see the ?capacitor selection? section, and table 3 for capacitor recommendations for other operating conditions. the charge pumps operate discontinuously (i.e., they turn off as soon as the v+ and v- supplies are pumped up to the nominal values), resulting in significant power savings. output resistance v cc =v+=v-=0v,transmitteroutput= 2v full 300 10m - ? output short-circuit current full - 35 60 ma output leakage current v out = 12v, v cc =0vor3vto5.5v,shdn =gnd full - - 25 a timing characteristics maximum data rate r l =3k ?, one transmitter switching c l = 1000pf mbaud = gnd full 250 700 - kbps v cc =3vto4.5v, c l = 250pf mbaud = v cc full 1000 1700 - kbps v cc = 4.5v to 5.5v, c l = 1000pf mbaud = v cc full 1000 1100 - kbps receiver propagation delay receiver input to receiver output, c l = 150pf t phl 25 - 0.15 - s t plh 25 - 0.15 - s receiver output enable time normal operation 25 - 200 - ns receiver output disable time normal operation 25 - 200 - ns transmitter skew t phl -t plh, note 3 mbaud = gnd 25 - 100 ns mbaud = v cc ,v cc =3.0v 25 - 25 ns receiver skew t phl -t plh ,c l = 150pf 25 - 50 - ns transition region slew rate v cc =3.3v, r l =3k ? to 7k ?, measured from 3v to -3v or -3v to 3v c l = 150pf to 1000pf mbaud = gnd 25 6 17 30 v/ s mbaud = v cc 25 24 40 150 v/ s c l = 150pf to 2500pf mbaud = gnd 25 4 12 30 v/ s esd performance rs-232 pins (t out ,r in ) human body model 25 - 15 - kv iec1000-4-2 contact discharge 25 - 8-kv iec1000-4-2 air gap discharge 25 - > 8-kv all other pins human body model 25 - 2.5 - kv note: 3. skew is measured at the input switching points (1.4v). electrical specifications test conditions: v cc =3v,c 1 -c 4 =0.22 f; v cc = 3.15v to 5.5v, c 1 -c 4 =0.1 f, unless otherwise specified. typicals are at t a =25 o c (continued) parameter test conditions temp ( o c) min typ max units ICL3237
6 transmitters the transmitters are proprietary, low dropout, inverting drivers that translate ttl/cmos inputs to eia/tia-232 output levels. coupled with the on-chip 5.5v supplies, these transmitters deliver true rs-232 levels over a wide range of single supply system voltages. all transmitter outputs disable and assume a high impedance state when the device enters the powerdown mode (see table 2). these outputs may be driven to 12v when disabled. the ICL3237 guarantees a 1mbps data rate (if mbaud = 1) for full load conditions (3k ? and 250pf), v cc 3.0v, with one transmitter operating at full speed. under more typical conditions of v cc 3.3v, c 1-4 =0.1 f, r l =3k ? ,and c l = 250pf, one transmitter easily operates at 1.7mbps. transmitter inputs float if left unconnected, and may cause i cc increases. connect unused inputs to gnd for the best performance. receivers the ICL3237 device contains standard inverting receivers that three-state only when the en control line is driven high. additionally, it includes a noninverting (monitor) receiver (denoted by the r outb label) that is always active, regardless of the state of any control lines. all the receivers convert rs-232 signals to cmos output levels and accept inputs up to 25v while presenting the required 3k ? to 7k ? input impedance (see figure 1) even if the power is off (v cc = 0v). the receivers? schmitt trigger input stage uses hysteresis to increase noise immunity and decrease errors due to slow input signal transitions. monitor receivers remain active even during manual powerdown and forced receiver disable, making them extremely useful for ring indicator monitoring. standard receivers driving powered down peripherals must be disabled to prevent current flow through the peripheral?s protection diodes (see figures 2 and 3). this renders them useless for wake up functions, but the corresponding monitor receiver can be dedicated to this task as shown in figure 3. powerdown functionality this 3v device requires a nominal supply current of 0.3ma during normal operation (not in powerdown mode). this is considerably less than the 5ma to 11ma current required of 5v rs-232 devices. the already low current requirement drops significantly when the device enters powerdown mode. in powerdown, supply current drops to 1 a, because the on-chip charge pump turns off (v+ collapses to v cc ,v- collapses to gnd), and the transmitter outputs three-state. this micro-power mode makes the ICL3237 ideal for battery powered and portable applications. software controlled (manual) powerdown on the ICL3237, the powerdown control is via a simple shutdown (shdn ) pin. driving this pin high enables normal operation, while driving it low forces the ic into it?s powerdown state. connect shdn to v cc if the powerdown function isn?t needed. note that all the receiver outputs remain enabled during shutdown (see table 2). for the lowest power consumption during powerdown, the receivers shouldalsobedisabledbydrivingtheen input high (see next section, and figures 2 and 3). the time required to exit powerdown, and resume transmission is only 100 s. receiver enable control this device also features an en input to control the receiver outputs. driving en high disables all the inverting (standard) receiver outputs placing them in a high impedance state. this is useful to eliminate supply current, due to a receiver output forward biasing the protection diode, when driving the input of a powered down (v cc = gnd) peripheral (see figure 2). the enable input has no effect on transmitter nor monitor (r outb ) outputs. table 2. powerdown and enable logic truth table shdn input en input transmitter outputs receiver outputs r outb output mode of operation l l high-z active active manual powerdown l h high-z high-z active manual powerdown w/rcvr. disabled h l active active active normal operation h h active high-z active normal operation w/rcvr. disabled r xout gnd v rout v cc 5k ? r xin -25v v rin +25v gnd v cc figure 1. inverting receiver connections ICL3237
7 megabaud selection in normal operating mode (mbaud = gnd), the ICL3237 transmitters guarantee a 250kbps data rate with worst-case loads of 3k ? in parallel with 1000pf. this provides compatibility with pc-to-pc communication software, such as laplink?. for higher speed serial communications, the ICL3237 features megabaud operation. in megabaud operating mode (mbaud = v cc ), the ICL3237 transmitters guarantee a 1mbps data rate with worst-case loads of 3k ? in parallel with 250pf for 3.0v < v cc <4.5v.for5v 10% operation, the ICL3237 transmitters guarantee a 1mbps data rate into worst-case loads of 3k ? in parallel with 1000pf. capacitor selection the charge pumps require 0.1 f capacitors for 3.3v operation. for other supply voltages refer to table 3 for capacitor values. do not use values smaller than those listed in table 3. increasing the capacitor values (by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. c 2 ,c 3 , and c 4 can be increased without increasing c 1 ?s value, however, do not increase c 1 without also increasing c 2 ,c 3 , and c 4 to maintain the proper ratios (c 1 to the other capacitors). when using minimum required capacitor values, make sure that capacitor values do not degrade excessively with temperature. if in doubt, use capacitors with a larger nominal value. the capacitor?s equivalent series resistance (esr) usually rises at low temperatures and it influences the amount of ripple on v+ and v-. power supply decoupling in most circumstances a 0.1 f bypass capacitor is adequate. in applications that are particularly sensitive to power supply noise, decouple v cc to ground with a capacitor of the same value as the charge-pump capacitor c 1 . connect the bypass capacitor as close as possible to the ic. transmitter outputs when exiting powerdown figure 4 shows the response of two transmitter outputs when exiting powerdown mode. as they activate, the two transmitter outputs properly go to opposite rs-232 levels, with no glitching, ringing, nor undesirable transients. each transmitter is loaded with 3k ? in parallel with 2500pf. note that the transmitters enable only when the magnitude of the supplies exceed approximately 3v. high data rates the ICL3237 maintains the rs-232 5v minimum transmitter output voltages even at high data rates. figure 5 details a transmitter loopback test circuit, and figure 6 illustrates the standard speed loopback test result for a single transmitter driving 1000pf and an rs-232 load at 250kbps. figure 7 shows the megabaud loopback results for a single transmitter driving 250pf and an rs-232 load at 1mbps. the static transmitters were also loaded with an rs-232 receiver. figure 2. power drain through powered down peripheral old v cc powered gnd shdn =gnd v cc rx tx v cc current v out =v cc flow rs-232 chip down uart figure 3. disabled receivers prevent power drain ICL3237 transition r x t x r1 outb r1 out t1 in v cc v cc to r1 in t1 out v out =hi-z powered shdn = gnd, en =v cc detector down uart wake-up logic table 3. required capacitor values v cc (v) c 1 ( f) c 2 ,c 3 ,c 4 ( f) 3.0 to 3.6 0.22 0.22 3.15 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.22 1.0 ICL3237 laplink? is a registered trademark of traveling software.
8 interconnection with 3v and 5v logic the ICL3237 directly interfaces with most 5v logic families, including act and hct cmos. see table 4 for more information on possible combinations of interconnections. figure 5. transmitter loopback test circuit figure 6. loopback test at 250kbps (c l = 1000pf) time (20 s/div.) t1 t2 2v/div. 5v/div. v cc = +3.3v shdn figure 4. transmitter outputs when exiting powerdown c1 - c4 = 0.1 f ICL3237 v cc c 1 c 2 c 4 c 3 + + + + c l v+ v- 5k t in r out c1+ c1- c2+ c2- r in t out + v cc 0.1 f v cc en shdn mbaud gnd or v cc t1 in t1 out r1 out 2 s/div. 5v/div. v cc =+3.3v c1 - c4 = 0.1 f mbaud = gnd figure 7. loopback test at 1mbps (c l =250pf) table 4. logic family compatibility with various supply voltages system power-supply voltage (v) 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. 5 3.3 compatible with act and hct cmos, and with ttl. incompatible with ac, hc, or cd4000 cmos. t1 in t1 out r1 out 0.5 s/div. 5v/div. v cc = +3.3v c1 - c4 = 0.1 f mbaud = v cc ICL3237
9 typical performance curves v cc =3.3v,t a =25 o c figure 8. low speed transmitter output voltage vs load capacitance figure 9. high speed transmitter output voltage vs load capacitance figure 10. low speed slew rate vs load capacitance figure 11. high speed slew rate vs load capacitance figure 12. low speed supply current vs load capacitance when transmitting data figure 13. high speed supply current vs load capacitance when transmitting data -6 -4 -2 0 2 4 6 1000 2000 3000 4000 5000 0 load capacitance (pf) transmitter output voltage (v) 1 transmitter at 250kbps v out + v out - other transmitters at 30kbps mbaud = gnd -6 -4 -2 0 2 4 6 1000 2000 3000 4000 5000 0 load capacitance (pf) transmitter output voltage (v) 1 transmitter at 1mbps v out + v out - other transmitters at 30kbps mbaud = v cc load capacitance (pf) slew rate (v/ s) 0 1000 2000 3000 4000 5000 5 10 15 20 25 +slew -slew mbaud = gnd -slew load capacitance (pf) slew rate (v/ s) 0 1000 2000 3000 4000 5000 10 30 50 -slew +slew 70 90 mbaud = v cc 0 20 25 30 35 40 55 45 50 0 1000 2000 3000 4000 5000 load capacitance (pf) supply current (ma) 20kbps 250kbps 120kbps mbaud = gnd 20 30 40 50 80 60 70 0 1000 2000 3000 4000 5000 load capacitance (pf) supply current (ma) 120kbps 1mbps 250kbps 90 mbaud = v cc ICL3237
10 die characteristics die dimensions 106 mils x 128 mils (2700 m x 3250 m) metallization type: metal 1: aisi (1%) thickness: metal 1: 8k ? type: metal 2: aisi (1%) thickness: metal 2: 10k ? substrate potential (powered up) gnd passivation type: silox thickness: 13k ? transistor count 619 process si gate cmos figure 14. supply current vs supply voltage typical performance curves v cc =3.3v,t a =25 o c (continued) supply current (ma) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0 0.5 1.0 1.5 2.0 supply voltage (v) 2.5 3.0 3.5 no load all outputs static ICL3237
11 all intersil products are manufactured, assembled and tested utilizing iso9000 quality systems. intersil corporation?s quality certifications can be viewed at website www.intersil.com/design/quality intersil products are sold by description only. intersil corporation reserves the right to make changes in circuit design and/or specifications at a ny time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnished by intersil is believed to b e accurate and reliable. how- ever, no responsibility is assumed by intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties wh ich may result from its use. no license is granted by implication or otherwise under any patent or patent rights of intersil or its subsidiaries. for information regarding intersil corporation and its products, see web site www.intersil.com sales office headquarters north america intersil corporation 2401 palm bay rd., mail stop 53-204 palm bay, fl 32905 tel: (321) 724-7000 fax: (321) 724-7240 europe intersil sa mercure center 100,ruedelafusee 1130 brussels, belgium tel: (32) 2.724.2111 fax: (32) 2.724.22.05 asia intersil ltd. 8f-2, 96, sec. 1, chien-kuo north, taipei, taiwan 104 republic of china tel: 886-2-2515-8508 fax: 886-2-2515-8369 ICL3237 shrink small outline plastic packages (ssop) notes: 1. symbols are defined in the ?mo series symbol list? in section 2.2 of publication number 95. 2. dimensioning and tolerancing per ansi y14.5m - 1982. 3. dimension ?d? does not include mold flash, protrusions or gate burrs. mold flash, protrusion and gate burrs shall not exceed 0.20mm (0.0078 inch) per side. 4. dimension ?e? does not include interlead flash or protrusions. inter- lead flash and protrusions shall not exceed 0.20mm (0.0078 inch) per side. 5. the chamfer on the body is optional. if it is not present, a visual in- dex feature must be located within the crosshatched area. 6. ?l? is the length of terminal for soldering to a substrate. 7. ?n? is the number of terminal positions. 8. terminal numbers are shown for reference only. 9. dimension ?b? does not include dambar protrusion. allowable dam- bar protrusion shall be 0.13mm (0.005 inch) total in excess of ?b? dimension at maximum material condition. 10. controlling dimension: millimeter. converted inch dimensions are not necessarily exact. index area e d n 123 -b- 0.25(0.010) c a m bs e -a- l b m -c- a1 a seating plane 0.10(0.004) c h 0.25(0.010) b m m 0.25 0.010 gauge plane a2 m28.209 (jedec mo-150-ah issue b) 28 lead shrink small outline plastic package symbol inches millimeters notes min max min max a - 0.078 - 2.00 - a1 0.002 - 0.05 - - a2 0.065 0.072 1.65 1.85 - b 0.009 0.014 0.22 0.38 9 c 0.004 0.009 0.09 0.25 - d 0.390 0.413 9.90 10.50 3 e 0.197 0.220 5.00 5.60 4 e 0.026 bsc 0.65 bsc - h 0.292 0.322 7.40 8.20 - l 0.022 0.037 0.55 0.95 6 n28 287 0 o 8 o 0 o 8 o - rev. 1 3/95

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