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fn6045 rev 6.00 page 1 of 14 may 13, 2010 fn6045 rev 6.00 may 13, 2010 isl3232e, isl4221e , isl4223e qfn packaged, 15kv esd protected, +2.7v to +5.5v, 150na, 250kb ps, rs-232 transmitters/receivers datasheet the intersil isl3232e and isl42 21e, isl4223e devices are 2.7v to 5.5v powered rs-232 tr ansmitters/receivers which meet ela/tia-232 and v.28/v. 24 specifications, even at v cc = 3.0v. additionally, they p rovide 15kv esd protection (iec61000-4-2 air gap and human body model) on transmitter outputs and receiver inputs (rs-232 pins). targeted applications are pdas, palmtops, and hand-held products where the low operational, and even lower standby, power consumption is critical. e fficient on-chip charge pumps, coupled with manual and autom atic power-down functions, reduce the standby supply curren t to a 150na trickle. tiny 5mmx5mm quad flat no-lead (qfn) packaging and the use of small, low value cap acitors ensure board space savings as well. data rate s greater than 250kbps are guaranteed at worst case load conditions. the isl4221e is a 1 driver, 1 receiver device and the isl3232e and isl4223e are 2 driver, 2 receiver devices that, coupled with the 5mmx5mm qfn package, provide the industrys smallest, lowest po wer serial port suitable for pdas, and hand-held applications. the 5mmx5mm qfn requires 40% less board area than a 20 ld tssop, and is nearly 20% thinner. the isl4221e, isl4223e versions feature an automatic power-down function that powers down the on-chip power supply and driver circuits. t his occurs when an attached peripheral device is shut off or the rs-232 cable is removed, conserving system power autom atically without changes to the hardware or oper ating system. it po wers up again when a valid rs-232 voltage is app lied to any receiver input. table 1 summarizes the feat ures of the ics, while application note an9863 summa rizes the features of each device comprising the 3v rs-232 family. features ? available in near chip scale qfn (5mmx5mm) package, which is 40% smaller than a 20 ld tssop ? esd protection for rs-232 i/o pins to ? 15kv (iec61000) ? meets eia/tia-232 and v.28 /v.24 specifications at 3v ? rs-232 compatible with v cc = 2.7v ? on-chip voltage converters r equire only four external 0.1f capacitors ? manual and automatic power -down features (except isl3232e) ? receiver hysteresis for improved noise immunity ? guaranteed minimum data rate . . . . . . . . . . . . . 250kbps ? wide power supply range . . . . . . single +2.7v to +5.5v ? low supply current in power- down state . . . . . . . .150na ? pb-free available (rohs compliant) applications ? any space constrained system requiring rs-232 ports - battery powered, and portable equipment - hand-held products (gps receivers, bar code scanners, etc.) - pdas and palmtops, data cables - cellular/mobile phones, digital cameras related literature ? technical brief tb363 guidelines for handling and processing moisture sensit ive surface mount devices ? technical brief tb379 th ermal characterization of packages for ics ? technical brief tb389 pcb land pattern design and surface mount guidelines for qfn packages table 1. summary of features part number no. of tx. no. of rx. qfn pkg. available? data rate (kbps) rx. enable function? manual power-down? automatic power-down function? isl4221e 1 1 yes 250 yes yes yes isl3232e 2 2 yes 250 no no no isl4223e 2 2 yes 250 yes yes yes
isl3232e, isl4221e, isl4223e fn6045 rev 6.00 page 2 of 14 may 13, 2010 ordering information part number part marking temp. range (c) package pkg. dwg. # ISL3232EIRZ* (note) isl3232 eirz -40 to +85 16 ld qfn (pb-free) l16 .5x5b isl4221eir* isl 4221eir -40 to +85 16 ld qfn l16.5x5b isl4221eirz* (note) isl4221 eirz -40 to +85 16 ld qfn (pb-free) l16 .5x5b isl4223eir* isl 4223eir -40 to +85 20 ld qfn l20.5x5 isl4223eirz* (note) isl4223 eirz -40 to +85 20 ld qfn (pb-free) l20 .5x5 *add -t suffix for tape and reel. please refer to tb347 for d etails on reel specifications. note: these intersil pb-free plastic packaged products employ sp ecial pb-free material sets, molding compounds/die attach mater ials, and 100% matte tin plate plus anneal (e3 termination finish, which is ro hs compliant and compatible with both snpb and pb-free solderin g operations). intersil pb-free products are msl classified at pb-free peak reflow temp eratures that meet or exceed the pb-free requirements of ipc/je dec j std-020. pinouts isl3232e (16 ld qfn) top view isl4221e (16 ld qfn) top view isl4223e (20 ld qfn) top view 1 3 4 15 c1- c2+ c2- v- v+ c1+ vcc gnd 16 14 13 2 12 10 9 11 6 578 t1out r1in r1out t1in t2out r2in r2out t2in pd 1 3 4 15 v+ c1- c2+ c2- c1+ en forceoff vcc 16 14 13 2 12 10 9 11 6 578 gnd t1out forceon t1in v- r1in r1out invalid pd v+ c1- c2+ c2- v- c1+ en forceoff vcc gnd t2out r2in r2out invalid t2in t1out r1in r1out forceon t1in 1 2 3 4 5 78910 6 20 19 18 17 16 13 14 15 12 11 pd
isl3232e, isl4221e, isl4223e fn6045 rev 6.00 page 3 of 14 may 13, 2010 pin descriptions pin function vcc system power supply input (2.7v to 5.5v). v+ internally generated positiv e transmitter supply (+5.5v). v- internally generated negative transmitter supply (-5.5v). gnd ground connection. this is als o the potential of the thermal pad (pd) c1+ external capacitor (voltage doubler) is connected to this le ad. c1- external capacitor (voltage doubler) is connected to this le ad. c2+ external capacitor (voltage inverter) is connected to this l ead. c2- external capacitor (voltage inverter) is connected to this l ead. tin ttl/cmos compatible transmitter inputs. tout ? 15kv esd protected , rs-232 level (nominally ? 5.5v) transmitter outputs. rin ? 15kv esd protected , rs-232 compatible receiver inputs. rout ttl/cmos level receiver outputs. invalid active low output that indicates if no valid rs-232 levels are present on any receiver input. forceoff active low to shut down transmitters and on-chip power supply. this overrides any automatic circuitry and forceon (see table 2 ). forceon active high input to over ride automatic power-down circu itry thereby keeping transmi tters active. (forceoff must be high). en active low receiver enable control. pd exposed thermal pad. connect to gnd. typical operating circuits isl3232e 14 v cc t1 out t2 out t1 in t2 in t 1 t 2 0.1f + 0.1f + 0.1f 9 8 12 5 15 1 16 4 v+ v- c1+ c1- c2+ c2- + 0.1f 2 3 r1 out r1 in 11 5k ? r2 out r2 in 6 7 5k ? 10 c 1 c 2 + c 3 c 4 gnd +3.3v + 0.1f 13 ttl/cmos logic levels rs-232 levels r 1 r 2
isl3232e, isl4221e, isl4223e fn6045 rev 6.00 page 4 of 14 may 13, 2010 isl4221e isl4223e typical operating circuits 13 v cc t1 out t1 in t 1 0.1f + 0.1f + 0.1f 9 11 16 2 1 5 v+ v- c1+ c1- c2+ c2- + 0.1f 3 4 r1 out r1 in r 1 6 7 5k ? c 1 c 2 + c 3 c 4 en 15 gnd +3.3v + 0.1f 12 ttl/cmos logic rs-232 levels forceon forceoff 10 14 v cc 8 invalid to power control logic levels 17 v cc t1 out t2 out t1 in t2 in t 1 t 2 0.1f + 0.1f + 0.1f 11 10 15 6 20 2 1 5 v+ v- c1+ c1- c2+ c2- + 0.1f 3 4 r1 out r1 in 14 5k ? r2 out r2 in 7 8 5k ? 13 c 1 c 2 + c 3 c 4 en 19 gnd +3.3v + 0.1f 16 ttl/cmos logic levels rs-232 levels r 1 r 2 forceon forceoff 12 18 v cc 9 invalid to power control logic
isl3232e, isl4221e, isl4223e fn6045 rev 6.00 page 5 of 14 may 13, 2010 absolute maximum ratings thermal information v cc to gnd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3v to 6v v+ to gnd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3v to 7v v- to gnd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3v to -7v v+ to v- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14v input voltages t in , forceoff , forceon, en . . . . . . . . . . . . . . . -0.3v to 6v r in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ? 25v output voltages t out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ? 13.2v r out , invalid . . . . . . . . . . . . . . . . . . . . . . . . -0.3v to v cc +0.3v short circuit duration t out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous esd rating . . . . . . . . . . . . . . . . . . . . . . . . . se e specification table thermal resistance (typical) ? ja (c/w) ? jc (c/w) 16 ld qfn package (notes 1, 2). . . . . 35 4.3 20 ld qfn package (notes 1, 2). . . . . 32 4.3 maximum junction temperatur e (plastic package) . . . . . . +1 50c maximum storage temperature range . . . . . . . . . .-65c to +1 50c pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below http://www.intersil.com/pbfree/pb-freereflow.asp operating conditions temperature range . . . . . . . . . . . . . . . . . . . . . . . . . .-40c to +85c caution: do not operate at or near the maximum ratings listed fo r extended periods of time. exposure to such conditions may adv ersely impact product reliability and result in failures not covered by warranty. note: 1. ? ja is measured in free air with the component mounted on a high e ffective thermal conductivity t est board with direct attach f eatures. see tech brief tb379, and tech brief tb389. 2. for ? jc , the case temp location is the center of the exposed metal p ad on the package underside. electrical specifications test conditions: v cc = 3v to 5.5v, c 1 through c 4 = 0.1f; unless otherwise specified. typicals are at t a = +25c parameter test conditions temp ( c) min (note 4) typ max (note 4) units dc characteristics supply current, automatic power-down all r in open, forceon = gnd, forceoff = v cc (except isl3232e) 25 - 0.15 1 a supply current, power-down forceoff = gnd (except isl3232e) 25 - 0.15 1 a supply current, automatic power-down disabled all outputs unloaded, forceon = forceoff = v cc v cc = 3.15v 25 - 0.3 1.0 ma logic and transmitter inputs and receiver outputs input logic threshold low t in , forceon, forceoff , en full - - 0.8 v input logic threshold high t in , forceon, forceoff , en v cc = 3.3v full 2.0 - - v v cc = 5.0v full 2.4 - - v input leakage current t in , forceon, forceoff , en full - 0.01 1.0 a output leakage current en = v cc (except isl3232e) 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 automatic power-down (forceon = gnd, forceoff = v cc , except isl3232e) receiver input thresholds to enable transmitters isl4221e, isl4223e powers up (see figure 6) full -2.7 - 2.7 v receiver input thresholds to disable transmitters isl4221e, isl4223e powers down (see figure 6) full -0.3 - 0.3 v invalid output voltage low i out = 1.6ma full - - 0.4 v invalid output voltage high i out = -1.0ma full v cc - 0.6 - - v receiver threshold to transmitters enabled delay (t wu ) 25 - 100 - s receiver positive or negative threshold to invalid high delay (t invh ) 25 - 1 - s receiver positive or negative threshold to invalid low delay (t invl ) 25 - 30 - s
isl3232e, isl4221e, isl4223e fn6045 rev 6.00 page 6 of 14 may 13, 2010 receiver inputs input voltage range 25 -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 25 - 1.5 2.4 v v cc = 5.0v 25 - 1.8 2.4 v input hysteresis 25 - 0.5 - 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 output resistance v cc = v+ = v- = 0v, transmitter output = 2v full 300 10m - ? output short-circuit current full - 35 60 ma output leakage current v out = ? 12v, v cc = 0v, or v cc = 3v to 5.5v, with automatic power-down or forceoff = gnd full - - 25 a timing characteristics maximum data rate r l = 3k ??? c l = 1000pf, one transmitter switching full 250 500 - kbps receiver propagation delay r eceiver 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 (except isl3232e) 25 -200-ns receiver output disable time normal operation (except isl3232e) 2 5- 200 - ns transmitter skew t phl - t plh (note 3) 25 - 100 - ns receiver skew t phl - t plh 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 2500pf 25 4 - 30 v/s c l = 150pf to 1000pf 25 6 - 30 v/s esd performance rs-232 pins (tout, rin) human body model 25 - 15 - kv iec61000-4-2 contact discharge 25 - 8 - kv iec61000-4-2 air gap discharge 25 - 15 - kv all other pins human body model 25 - 2 - kv notes: 3. transmitter skew is measured at the transmitter zero crossing points. 4. parameters with min and/or max limits are 100% tested at +25 c, unless otherwise specified. t emperature limits established b y characterization and are not production tested. electrical specifications test conditions: v cc = 3v to 5.5v, c 1 through c 4 = 0.1f; unless otherwise specified. typicals are at t a = +25c (continued) parameter test conditions temp ( c) min (note 4) typ max (note 4) units
isl3232e, isl4221e, isl4223e fn6045 rev 6.00 page 7 of 14 may 13, 2010 detailed description the isl4221e, isl4223e and isl3232e operate from a single +2.7v to +5.5v supply, guarantee a 250kbps minimum data rate, require only four sma ll external 0.1f capacitors, feature low power consumptio n, and meet all ela rs-232c and v.28 specifications even with v cc = 3.0v. the circuit is divided into three sections: the charge pump, the transmitters and the receivers. charge-pump intersils new rs-232 devices u tilize regulated on-chip dual charge pumps as voltage doubler s, and voltage inverters to generate 5.5v transmitter supplies from a v cc supply as low as 3.0v. this allows them to maintain rs-232 compliant output levels over the 10% tolerance range of 3.3v powered systems. the effici ent on-chip power supplies require only four sma ll, external 0.1f capacitors for the voltage doubler and inverter functions. the charge pumps operate discontinuously (i.e., th ey turn off as soon as the v+ and v- supplies are pumped up to the nominal values), resulting in signifi cant power savings. transmitters the transmitters are proprietary, low dropout, inverting driver s 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 isl4221e, isl4223e transm itter outputs disable and assume a high impedance state when the device enters the power-down mode (see table 2). these outputs may be driven to 12v when disabled. the devices guarantee a 250kb ps data rate for full load conditions (3k ? and 1000pf), v cc ? 3.0v, with one transmitter operating at full speed. under more typical conditions of v cc ? 3.3v, r l = 3k ? , and c l = 250pf, one transmitter easily operates at 900kbps. transmitter inputs float if left unconnected, and may cause i cc increases. connect unused in puts to gnd for the best performance. receivers all these rs-232 devices contain standard inverting receivers, and the isl4221e, isl4223e receivers three-state via the en control line. all the receivers c onvert 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 receiver s schmitt trigger input stage uses hysteresis to increase noise immunity and decrease errors due to slow input signal transitions. receivers driving a powered down uart must be disabled to prevent current flow through, and possible damage to, the uarts protection diodes (se e figures 2 and 3). this can be accomplished on the isl4221e, i sl4223e by driving the en input high whenever the uart powers down. figure 3 also shows that the invalid output can be used to determine when the uart should be powered down. when the rs-232 cable is disconnected, invalid switches low indicating that the uart is no longer needed. rec onnecting the cable drives invalid back high, indicating that the uart should be powered up. r xout gnd ? v rout ? v cc 5k ? r xin -25v ? v rin ? +25v gnd v cc figure 1. inverting receiver connections 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 isl4221e, isl4223e transition r x t x invalid r out t in v cc v cc to r in t out v out = hi-z powered detector down uart wake-up logic en = v cc
isl3232e, isl4221e, isl4223e fn6045 rev 6.00 page 8 of 14 may 13, 2010 low power operation these 3v devices r equire a nominal supply current of 0.3ma, even at v cc = 5.5v, during normal operation (not in power-down mode). this is con siderably less than the 5ma to 11ma current required by c omparable 5v rs-232 devices, allowing users to reduce system power simply by switching to this new family. power-down functionality (excluding isl3232e) the already low current require ment drops significantly when the device enters power-down mode. in power-down, supply current drops to 150na because the on-chip charge pump turns off (v+ collapses to v cc , v- collapses to gnd) and the transmitter outputs three-state. receiver outputs are unaffected by power-down; refer to table 2 for details. this micro-power mode makes the isl4221e, isl4223e ideal for battery-powered and portable applications. software controlled (manual) power-down the isl4221e, isl4223e family p rovides pins that allow the user to force the ic into the low power, standby state. the isl4221e, isl4223e utiliz e a two pin approach where the forceon and forceoff inputs determine the ics mode. for always enabled operation, forceon and forceoff are both strapped high. to switch between active and power-down modes, under logi c or software control, only the forceoff input need be driven. the forceon state isnt critical, as forceoff dominates over forceon. nevertheless, if stric tly manual control ov er power-down is desired, the user m ust strap forceon h igh to disable the automatic power-down circuitry. connecting forceoff and forceon together disables the automatic power-down featur e, enabling them to function as a manual shutdown input (see figure 4). the time to recover from aut omatic power-down mode is typically 100s. table 2. power-down and enable logic truth table (excluding isl3 232e) rs-232 signal present at receiver input? forceoff input forceon input en input transmitter outputs receiver outputs invalid output mode of operation no h h l active active l normal operation (auto power-down disabled) no h h h active high-z l yes h l l active active h normal operation (auto power-down enabled) yes h l h active high-z h no h l l high-z active l power-down due to auto power-down logic no h l h high-z high-z l yes l x l high-z active h manual power-down yes l x h high-z high-z h manual power-down w/rcvr. disabled no l x l high-z active l manual power-down no l x h high-z high-z l manual power-down w/rcvr. disabled figure 4. connections for manual power-down when no valid receiver signals are present pwr forceoff invalid cpu i/o forceon isl4221e, isl4223e mgt logic uart figure 5. circuit to prevent auto power-down for 100ms after forced power-up isl4221e, isl4223e forceoff forceon power master power-down line 1m ? 0.1f management unit
isl3232e, isl4221e, isl4223e fn6045 rev 6.00 page 9 of 14 may 13, 2010 automatic power-down (excluding isl3232e) even greater power savings i s available by using the automatic power-down functi on. when no valid rs-232 voltages (see figure 6) are sen sed on any receiver input for 30s, the charge pum p and transmitters power-down, thereby reducing supply current to 150na. invalid receiver levels occur whenever the driv ing peripherals outputs are shut off (powered down) or whe n the rs-232 interface cable is disconnected. the isl42 21e, isl4223e powers back up whenever it detects a valid rs-232 voltage level on any receiver input. this automatic power-down feature provides additional system power sav ings without changes to the existing operating system. automatic power-down operates when the forceon input is low, and the forceoff input is high. tying forceon high disables automatic power-dow n, but manual power-down is always available via the overriding forceoff input. table 2 summarizes the automatic power-down functionality. some applications may need more time to wake up from shutdown. if automatic power-down is being utilized, the rs-232 device will re -enter power-down if valid receiver levels arent reestablished w ithin 30s of the isl4221e, isl4223e powering up. figure 5 illustrates a circuit that keeps the isl4221e, isl4223e f rom initiating automatic power-down for 100ms after p owering up. this gives the slow-to-wake peripheral circu it time to re-establish valid rs-232 output levels. the time to recover from automatic power-down mode is typically 100s. invalid output (excluding isl3232e) the invalid output always indicates whether or not a valid rs-232 signal (see figure 6) is present at any of the receiver inputs (see table 2), giving the user an easy way to determine when the interface block should power down. invalid receiver levels oc cur whenever the driving peripherals outputs are shut off (powered down) or when the rs-232 interface cable is di sconnected. in the case of a disconnected interface cable wh ere all the receiver inputs are floating (but pulled to gnd by the internal receiver pull down resistors), the invalid logic detects the invalid levels and drives the output low. the power management logic then uses this indicator to powe r-down the interface block. reconnecting the cable restores valid levels at the receiver inputs, invalid switches high, and t he power management logic wakes up the interface block. invalid can also be used to indicate the dtr or ring indicator signal, as long as the other receiver inputs are floating, or driven to gnd (as in the case of a powered down driver). invalid switches low after invalid levels have persisted on all of the receiver inputs for more than 30s (see figure 7). invalid switches back high 1s a fter detecting a valid rs-232 level on a receiver input. invalid operates in all modes (forced or automatic powe r-down, or forced on), so it is also useful for systems employing manual power-down circuitry. when automatic pow er-down is utilized, invalid = 0 indicates that the isl4221e, isl4223e is in power-down mode. capacitor selection the charge pumps require 0.1f, or greater, capacitors for proper operation. increasing the capacitor values (by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. when using minimum required capacitor values, make sure that capacitor values do not degrade excessively with temperature. if in doubt, use ca pacitors with a larger nominal value. the capacitors equivalent series resistance (esr) usually rises at low temperat ures and it influences the amount of ripple on v+ and v- . figure 6. definition of val id rs-232 receiver levels 0.3v -0.3v -2.7v 2.7v invalid level - powe r-down occurs after 30 s valid rs-232 level - isl4221e, isl4223e is active valid rs-232 level - isl4221e, isl4223e is active indeterminate - power-down may or indeterminate - power-down may or may not occur may not occur receiver inputs transmitter outputs invalid output v+ v cc 0 v- v cc 0 t invl t invh invalid region } figure 7. automatic power-down and invalid timing diagrams autopwdn pwr up
isl3232e, isl4221e, isl4223e fn6045 rev 6.00 page 10 of 14 may 13, 2010 power supply decoupling in most circumstances a 0.1f 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 power-down figure 8 shows the response o f two transmitter outputs when exiting power-down 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 en able only when the magnitude of the supplies exceed approximately 3v. operation down to 2.7v isl4221e, isl4223e and isl3232e transmitter outputs meet rs-562 levels (3.7v), at the full data rate, with v cc as low as 2.7v. rs-562 leve ls typically ensure inter operability with rs-232 devices. high data rates the isl4221e, isl4223e and isl3232e maintain the rs- 232 5v minimum transmitter output voltages even at high data rates. figure 9 details a transmitter loopback test circuit, and figure 10 illustrate s the loopback test result at 120kbps. for this test, all tra nsmitters were simultaneously driving rs-232 loads in paralle l with 1000pf, at 120kbps. figure 11 shows the loopback results for a single transmitter driving 1000pf and an rs-232 load at 250 kbps. the static transmitters were also load ed with an rs-232 receiver. time (20 s/div) t1 t2 2v/div 5v/div v cc = +3.3v forceoff figure 8. transmitter outputs when exiting power-down c1 - c4 = 0.1 f figure 9. transmitter loopback test circuit figure 10. loopback test at 120kbps figure 11. loopback test at 250kbps isl4221e, isl4223e v cc forceoff c 1 c 2 c 4 c 3 + + + + 1000pf v+ v- 5k t in r out c1+ c1- c2+ c2- r in t out + v cc 0.1 f v cc forceon t1 in t1 out r1 out time (5 s/div) v cc = +3.3v 5v/div c1 - c4 = 0.1 f t1 in t1 out r1 out time (2 s/div) 5v/div v cc = +3.3v c1 - c4 = 0.1 f
fn6045 rev 6.00 page 11 of 14 may 13, 2010 isl3232e, isl4221e, isl4223e intersil products are manufactured, assembled and tested utilizing iso9001 quality systems as noted in the quality certifications found at www.intersil.com/en/suppor t/qualandreliability.html intersil products are sold by description on ly. intersil may modify the circuit design an d/or specifications of products at any time without notice, provided that such modification does not, in intersil's sole judgment, affect the form, fit or function of the product. accordingly, the reader is cautioned to verify that datasheets are current before placing orders. information fu rnished by intersil is believed to be accu rate and reliable. however, no responsib ility is assumed by intersil or its subsidiaries for its use; nor for any infrin gements of patents or other rights of third parties which 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 www.intersil.com for additional products, see www.intersil.com/en/products.html ? copyright intersil americas ll c 2004-2010. all rights reserved. all trademarks and registered trademarks are the property of their respective owners. interconnection with 3v and 5v logic the isl4221e, isl4223e and is l3232e directly interface with 5v cmos and ttl logic fami lies. nevertheless, with the isl4221e, isl4223e and isl3232e at 3.3v, and the logic supply at 5v, ac, hc, and cd4 000 outputs can properly drive isl4221e, isl4223e and isl3232e inputs, but isl4221e, isl4223e and isl3232e outputs do not reach the minimum v ih for these logic families. see table 3 for more information. 15kv esd protection all pins on isl4221e, isl4223e and isl3232e devices include esd protection stru ctures, but the rs-232 pins (transmitter outpu ts and receiver inputs) incorporate advanced structures, which allow them to survive esd events up to 15kv. the rs-232 pins are particularly vulnerable to esd damage because they typically connect to an exposed port on th e exterior of the finished product. simply touching the port pins, or connecting a cable, can cause an esd event that might destroy unprotected ics. these new esd structures protec t the device whether or not it is powered-up, protect wit hout allowing any latchup mechanism to activate, and don t interfere with rs-232 signals as large as 25v. human body model (hbm) testing as the name implies, this tes t method emulates the esd event delivered to an ic during human ha ndling. the tester delivers the charge through a 1.5k ? current limiting resistor, making the test less severe t han the iec61000 test which utilizes a 330 ? limiting resist or. the hbm method determines an ics ab ility to withstand the esd transients typically present during handlin g and manufacturing. due to the random nat ure of these events, eac h pin is t ested with respect to all other pins. the rs-232 pins on e family devices can withstand hbm esd events to ? 15kv. iec61000-4-2 testing the iec61000-4-2 test met hod applies to finished equipment, rather than to an individual ic. therefore, the pins most likely to suffer an esd event are those that are exposed to the outside world (t he rs-232 pins in this case), and the ic is tested in its typi cal application configuration (power applied) rather than testing each pin-to-pin combination. the lower current limiting resistor coupled with the larger charge storage capacitor yields a test that is much more severe than the hbm tes t. the extra esd protection built into this devices rs-232 pins allows the design of equipment meeting level 4 cr iteria without the need for additional board level protection on the rs-232 port. air-gap discharg e test method for this test method, a charg ed probe tip moves toward the ic pin until the voltage arcs to it. the current waveform delivered to the ic pin depends on approach speed, humidity, temperature, etc., so it is difficult to obtain repeatable results. the e device rs-232 pins withstand 15kv air-gap discharges. contact discharge test method during the contact discharge test, the probe contacts the tested pin before the probe tip is energized, thereby eliminating the variables a ssociated with the air-gap discharge. the result is a more repeatable and predictable test, but equipment limits prevent testing devices at voltages higher than 8kv. all e family devices survive 8kv contact discharges on the rs-232 pins. table 3. 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. isl4221e, isl4223e and isl3232e outputs are incompatible with ac, hc, and cd4000 cmos inputs.
isl3232e, isl4221e, isl4223e fn6045 rev 6.00 page 12 of 14 may 13, 2010 typical performance curves v cc = 3.3v, t a = +25c figure 12. transmitter output voltage vs load capacitance figure 13. slew rate vs load capacitance figure 14. supply current vs load capacitance when transmitting data figure 15. supply current vs load capacitance when transmitting data figure 16. supply current vs supply voltage die characteristics substrate and qfn ther mal pad potential (powered up): gnd transistor count: isl3232e: 296 isl4221e: 286 isl4223e: 357 process: si gate cmos -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 load capacitance (pf) slew rate (v/ s) 0 1000 2000 3000 4000 5000 5 10 15 20 25 +slew -slew 0 5 10 15 20 25 30 45 35 40 0 1000 2000 3000 4000 5000 load capacitance (pf) supply current (ma) 20kbps 250kbps 120kbps isl4221e 0 5 10 15 20 25 30 45 35 40 0 1000 2000 3000 4000 5000 load capacitance (pf) supply current (ma) 20kbps 250kbps 120kbps isl4223e/isl3232e 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
isl3232e, isl4221e, isl4223e fn6045 rev 6.00 page 13 of 14 may 13, 2010 package outline drawing l16.5x5b 16 lead quad flat no-lead plastic package rev 2, 02/08 located within the zone indicat ed. the pin #1 identifier may be unless otherwise specified, tolerance : decimal 0.05 tiebar shown (if present) is a non-functional feature. the configuration of the pin #1 identifier is opt ional, but mus t be between 0.15mm and 0.30mm from the terminal tip. dimension b applies to the metalli zed terminal and is measured dimensions in ( ) for reference only. dimensioning and tolerancing conform to amse y14.5m-1994. 6. either a mold or mark feature. 3. 5. 4. 2. dimensions are in millimeters. 1. notes: bottom view detail "x" side view typical recommended land pattern top view 0.15 (4x) index area pin 1 6 5.00 5.00 b a pin #1 index area 16 13 4x 0.80 12x 2.4 6 4 3 . 10 0 . 15 1 cb a 0.10 m 0.33 +0.07 / -0.05 4 5 16x 0 . 60 8 9 12 1.00 max base plane seating plane 0.08 see detail "x" 0.10 c c c 0 . 00 min. 0 . 05 max. 0 . 2 ref c 5 ( 4 . 6 typ ) ( 3 . 10 ) ( 16x 0 .33 ) ( 16 x 0 . 8 ) ( 12x 0 . 80 ) +0.15 -0.10
isl3232e, isl4221e, isl4223e fn6045 rev 6.00 page 14 of 14 may 13, 2010 quad flat no-lead plastic package (qfn) micro lead frame pl astic package (mlfp) l20.5x5 20 lead quad flat no-lead plastic package symbol millimeters notes min nominal max a 0.80 0.90 1.00 - a1 - 0.02 0.05 - a2 - 0.65 1.00 9 a3 0.20 ref 9 b 0.23 0.30 0.38 5, 8 d 5.00 bsc - d1 4.75 bsc 9 d2 2.95 3.10 3.25 7, 8 e 5.00 bsc - e1 4.75 bsc 9 e2 2.95 3.10 3.25 7, 8 e 0.65 bsc - k0.20 - - - l 0.35 0.60 0.75 8 n202 nd 5 3 ne 5 3 p- -0.609 ? --129 rev. 4 11/04 notes: 1. dimensioning and tolerancing conform to asme y14.5-1994. 2. n is the number of terminals. 3. nd and ne refer to the number of terminals on each d and e. 4. all dimensions are in mill imeters. angles are in degrees. 5. dimension b applies to the meta llized terminal and is measure d between 0.15mm and 0.30mm from the terminal tip. 6. the configuration of the pin #1 identifier is optional, but m ust be located within the zone indicated. the pin #1 identifier may be either a mold or mark feature. 7. dimensions d2 and e2 are for the exposed pads which provide improved electrical and thermal performance. 8. nominal dimensions are provid ed to assist with pcb land patte rn design efforts, see intersil technical brief tb389. 9. features and dimensions a2, a3, d1, e1, p & ? are present when anvil singulation method is used and not present for saw singulation. 10. compliant to jedec mo-220vhhc issue i except for the "b" dimension.

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