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1 ? fn6051.2 isl8487e, isl81487l, isl81487e 15kv esd protected, 1/8 unit load, 5v, low power, high spee d or slew rate limited, rs-485/rs -422 transceivers these intersil rs-485/rs-422 devices are esd protected, fractional unit load (ul), bicmos, 5v powered, single transceivers that meet both the rs-485 and rs-422 standards for balanced communication. each driver output/ receiver input is protected against 15kv esd strikes, without latch-up. unlike competit ive devices, this intersil family is specified for 10% tolerance supplies (4.5v to 5.5v). all devices present a 1/8 ?unit load? to the rs-485 bus, which allows up to 256 transceivers on the network for large node count systems (e.g., pr ocess automation, remote meter reading systems). in a remote utility meter reading system, individual (apartments for example) utility meter readings are routed to a concentrator via an rs-485 network, so the high allowed node count minimizes the number of repeaters required to network all the meters. data for all meters is then read out from the concentrator via a single access port, or a wireless link. slew rate limited drivers on the isl8487e and isl81487l reduce emi, and minimize reflections from improperly terminated transmission lines, or unterminated stubs in multidrop and multipoint applications. data rates up to 250kbps are achievable with these devices. data rates up to 5mbps are achievable by using the isl81487e, which features higher slew rates. receiver (rx) inputs feature a ?fail-safe if open? design, which ensures a logic high rx output if rx inputs are floating. driver (tx) outputs are short circuit protected, even for voltages exceeding the power supply voltage. additionally, on-chip thermal shutdown circuitr y disables the tx outputs to prevent damage if power dissipation becomes excessive. these half duplex devices multiplex the rx inputs and tx outputs to allow transceivers with rx and tx disable functions in 8 lead packages. features ? rs-485 i/o pin esd protection . . . . . . . . . . . . . 15kv hbm - class 3 esd level on all other pins . . . . . . >7kv hbm ? fractional unit load allows up to 256 devices on the bus ? specified for 10% tolerance supplies ? high data rate version (isl81487e) . . . . . up to 5mbps ? slew rate limited versi ons for error free data transmission (isl8487e, isl81487l) . . . . .up to 250kbps ? low current shutdown mode (except isl81487e). . . . 1na ? low quiescent supply current: - isl8487e, isl81487l . . . . . . . . . . . . . . . 120 a (max.) - isl81487e . . . . . . . . . . . . . . . . . . . . . . . . 300 a (max.) ? -7v to +12v common mode input voltage range ? three state rx and tx outputs ? 30ns propagation delays, 5ns skew (isl81487e) ? half duplex pinouts ? operate from a single +5v supply (10% tolerance) ? current limiting and thermal shutdown for driver overload protection ? pin compatible replacements for: max487e, (isl8487e); ltc1487, adm1487 (isl81487l); max1487e, st485er (isl81487e) applications ? high node count networks ? automated utility meter reading systems ? factory automation ? security networks ? building environmental control systems ? industrial/process control networks table 1. summary of features part number half/full duplex no. of devices allowed on bus data rate (mbps) slew-rate limited? receiver/ driver enable? quiescent i cc ( a) low power shutdown? pin count isl8487e half 256 0.25 yes yes 100 yes 8 isl81487l half 256 0.25 yes yes 100 yes 8 isl81487e half 256 5 no yes 250 no 8 data sheet december 2003 caution: these devices are sensitive to electrosta tic discharge; follow proper ic handling procedures. 1-888-intersil or 321-724-7143 | intersil (and design) is a registered trademark of intersil americas inc. copyright ? intersil americas inc. 2003. all rights reserved all other trademarks mentioned are the property of their respective owners.
2 pinout isl8487e, isl81487l, isl81487e (pdip, soic) top view ordering information part no. (brand) temp. range ( o c) package pkg. dwg. # isl8487eib (8487eib) -40 to 85 8 ld soic m8.15 isl8487eip -40 to 85 8 ld pdip e8.3 isl81487lib (81487lib) -40 to 85 8 ld soic m8.15 isl81487lip -40 to 85 8 ld pdip e8.3 ISL81487EIB (81487eib) -40 to 85 8 ld soic m8.15 isl81487eip -40 to 85 8 ld pdip e8.3 note: soic also available in tape and reel; add ?-t? to suffix. ro re de di 1 2 3 4 8 7 6 5 v cc b/z a/y gnd d r truth tables transmitting inputs outputs re de di z y x1101 x1010 0 0 x high-z high-z 1 0 x high-z * high-z * *shutdown mode for isl8487e, isl81487l (see note 7) receiving inputs output re de a-b ro 00 +0.2v 1 00 -0.2v 0 0 0 inputs open 1 10xhigh-z * 1 1 x high-z *shutdown mode for isl8487e, isl81487l (see note 7) pin descriptions pin function ro receiver output: if a > b by at least 0.2v, ro is high; if a < b by 0.2v or more, ro is low; ro = high if a and b are unconne cted (floating). re receiver output enable. ro is enabled when re is low; ro is high impedance when re is high. de driver output enable. the driver outputs, y and z, are enabled by bringing de high. they are high impedance when de is low. di driver input. a low on di forces output y low and output z hi gh. similarly, a high on di forces output y high and output z lo w. gnd ground connection. a/y 15kv hbm esd protected, rs-485/422 level, noninverting receiver input and noninverting driver output. pin is an input (a) if de =0; pin is an output (y) if de = 1. b/z 15kv hbm esd protected, rs-485/422 level, inverting receiver input and inverting driver output. pin is an input (b) if de = 0; pin is an output (z) if de = 1. v cc system power supply input (4.5v to 5.5v). isl8487e, isl81487l, isl81487e
3 typical operating circuits isl8487e, isl81487l, isl81487e 0.1 f + d r 7 6 8 1 2 3 4 5 v cc gnd ro re de di a/y b/z +5v 0.1 f + d r 6 7 8 1 2 3 4 5 v cc gnd ro re de di a/y b/z +5v r t r t +5v isl8487e, isl81487l, isl81487e
4 ( absolute maximum rati ngs thermal information v cc to ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7v input voltages di, de, re . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5v to (v cc +0.5v) input/output voltages a/y, b/z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8v to +12.5v ro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5v to (v cc +0.5v) short circuit duration y, z. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous esd rating . . . . . . . . . . . . . . . . . . . . . . . . see specification table operating conditions temperature range isl8xxxix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 o c to 85 o c thermal resistance (typical, note 1) ja ( o c/w) 8 ld soic package . . . . . . . . . . . . . . . . . . . . . . . . . 170 8 ld pdip package . . . . . . . . . . . . . . . . . . . . . . . . . 140 maximum junction temperature (plastic package) . . . . . . . 150 o c maximum storage temperature range . . . . . . . . . -65 o c to 150 o c maximum lead temperature (soldering 10s) . . . . . . . . . . . . 300 o c (soic - lead tips only) caution: stresses above those listed in ?abs olute maximum ratings? may cause permanent dam age to the device. this is a stress o nly rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. note: 1. ja is measured with the component mounted on a low effective ther mal conductivity test board in free air. see tech brief tb379 fo r details. electrical specifications test conditions: v cc = 4.5v to 5.5v; unless otherwise specified. typicals are at v cc = 5v, t a = 25 o c, (note 2) parameter symbol test conditions temp ( o c) min typ max units dc characteristics driver differential v out (no load) v od1 full - - v cc v driver differential v out (with load) v od2 r = 50 ? (rs-422), (figure 1) full 2 3 - v r = 27 ? (rs-485), (figure 1) full 1.5 2.3 5 v change in magnitude of driver differential v out for complementary output states ? v od r = 27 ? or 50 ? , (figure 1) full - 0.01 0.2 v driver common-mode v out v oc r = 27 ? or 50 ? , (figure 1) full - - 3 v change in magnitude of driver common-mode v out for complementary output states ? v oc r = 27 ? or 50 ? , (figure 1) full - 0.01 0.2 v logic input high voltage v ih de, di, re full 2 - - v logic input low voltage v il de, di, re full - - 0.8 v logic input current i in1 de, di, re full -2 - 2 a input current (a/y, b/z), (note 10) i in2 de = 0v, v cc = 4.5 to 5.5v v in = 12v full - - 140 a v in = -7v full - - -120 a i in2 de = 0v, v cc = 0v v in = 12v full - - 180 a v in = -7v full - - -100 a receiver differential threshold voltage v th -7v v cm 12v full -0.2 - 0.2 v receiver input hysteresis ? v th v cm = 0v 25 - 70 - mv receiver output high voltage v oh i o = -4ma, v id = 200mv full 3.5 - - v receiver output low voltage v ol i o = -4ma, v id = 200mv full - - 0.4 v three-state (high impedance) receiver output current i ozr 0.4v v o 2.4v full - - 1 a receiver input resistance r in -7v v cm 12v full 96 - - k ? isl8487e, isl81487l, isl81487e
5 no-load supply current, (note 3) i cc isl81487e, di, re = 0v or v cc de = v cc full - 300 500 a de = 0v full - 250 300 a isl8487e, isl81487l, di, re = 0v or v cc de = v cc full - 150 200 a de = 0v full - 100 120 a shutdown supply current i shdn (note 7), de = 0v, re = v cc , di = 0v or v cc full - 1 50 na driver short-circuit current, v o = high or low i osd1 de = v cc , -7v v y or v z 12v, (note 4) full 35 - 250 ma receiver short-circuit current i osr 0v v o v cc full 7 - 85 ma switching characteristics (isl81487e) driver input to output delay t plh , t phl r diff = 54 ? , c l = 100pf, (figure 2) full 18 24 50 ns driver output skew t skew r diff = 54 ? , c l = 100pf, (figure 2) full - 3 10 ns driver differential rise or fall time t r , t f r diff = 54 ? , c l = 100pf, (figure 2) full 3 12 25 ns driver enable to output high t zh c l = 100pf, sw = gnd, (figure 2) full - 14 70 ns driver enable to output low t zl c l = 100pf, sw = v cc , (figure 2) full - 14 70 ns driver disable from output high t hz c l = 15pf, sw = gnd, (figure 2) full - 44 70 ns driver disable from output low t lz c l = 15pf, sw = v cc , (figure 2) full - 21 70 ns receiver input to output delay t plh , t phl (figure 4) full 30 90 150 ns receiver skew | t plh - t phl |t skd (figure 4) 25 - 5 - ns receiver enable to output high t zh c l = 15pf, sw = gnd, (figure 5) full - 9 50 ns receiver enable to output low t zl c l = 15pf, sw = v cc , (figure 5) full - 9 50 ns receiver disable from output high t hz c l = 15pf, sw = gnd, (figure 5) full - 9 50 ns receiver disable from output low t lz c l = 15pf, sw = v cc , (figure 5) full - 9 50 ns maximum data rate f max full 5 - - mbps switching characteristics (isl8487e) driver input to output delay t plh , t phl r diff = 54 ? , c l = 100pf, (figure 2) full 250 650 2000 ns driver output skew t skew r diff = 54 ? , c l = 100pf, (figure 2) full - 160 800 ns driver differential rise or fall time t r , t f r diff = 54 ? , c l = 100pf, (figure 2) full 250 900 2000 ns driver enable to output high t zh c l = 100pf, sw = gnd, (figure 3, note 5) full 250 1000 2000 ns driver enable to output low t zl c l = 100pf, sw = v cc , (figure 3, note 5) full 250 860 2000 ns driver disable from output high t hz c l = 15pf, sw = gnd, (figure 3) full 300 660 3000 ns driver disable from output low t lz c l = 15pf, sw = v cc , (figure 3) full 300 640 3000 ns receiver input to output delay t plh , t phl (figure 4) full 250 500 2000 ns receiver skew | t plh - t phl |t skd (figure 4) 25 - 60 - ns receiver enable to output high t zh c l = 15pf, sw = gnd, (figure 5, note 6) full - 10 50 ns receiver enable to output low t zl c l = 15pf, sw = v cc , (figure 5, note 6) full - 10 50 ns receiver disable from output high t hz c l = 15pf, sw = gnd, (figure 5) full - 10 50 ns receiver disable from output low t lz c l = 15pf, sw = v cc , (figure 5) full - 10 50 ns maximum data rate f max full 250 - - kbps time to shutdown t shdn (note 7) full 50 120 600 ns driver enable from shutdown to output high t zh(shdn) c l = 100pf, sw = gnd, (figure 3, notes 7, 8) full - 1000 2000 ns driver enable from shutdown to output low t zl(shdn) c l = 100pf, sw = v cc , (figure 3, notes 7, 8) full - 1000 2000 ns electrical specifications test conditions: v cc = 4.5v to 5.5v; unless otherwise specified. typicals are at v cc = 5v, t a = 25 o c, (note 2) (continued) parameter symbol test conditions temp ( o c) min typ max units isl8487e, isl81487l, isl81487e
6 receiver enable from shutdown to output high t zh(shdn) c l = 15pf, sw = gnd, (figure 5, notes 7, 9) full - 800 2500 ns receiver enable from shutdown to output low t zl(shdn) c l = 15pf, sw = v cc , (figure 5, notes 7, 9) full - 800 2500 ns switching characteristics (isl81487l) driver input to output delay t plh , t phl r diff = 54 ? , c l = 100pf, (figure 2) full 150 650 1200 ns driver output skew t skew r diff = 54 ? , c l = 100pf, (figure 2) full - 160 600 ns driver differential rise or fall time t r , t f r diff = 54 ? , c l = 100pf, (figure 2) full 250 900 1200 ns driver enable to output high t zh c l = 100pf, sw = gnd, (figure 3, note 5) full 100 1000 1500 ns driver enable to output low t zl c l = 100pf, sw = v cc , (figure 3, note 5) full 100 1000 1500 ns driver disable from output high t hz c l = 15pf, sw = gnd, (figure 3) full 150 750 1500 ns driver disable from output low t lz c l = 15pf, sw = v cc , (figure 3) full 150 750 1500 ns receiver input to output delay t plh , t phl (figure 4) full 30 175 250 ns receiver skew | t plh - t phl |t skd (figure 4) 25 - 13 - ns receiver enable to output high t zh c l = 15pf, sw = gnd, (figure 5, note 6) full - 10 50 ns receiver enable to output low t zl c l = 15pf, sw = v cc , (figure 5, note 6) full - 10 50 ns receiver disable from output high t hz c l = 15pf, sw = gnd, (figure 5) full - 10 50 ns receiver disable from output low t lz c l = 15pf, sw = v cc , (figure 5) full - 10 50 ns maximum data rate f max full 250 - - kbps time to shutdown t shdn (note 7) full 50 140 600 ns driver enable from shutdown to output high t zh(shdn) c l = 100pf, sw = gnd, (figure 3, notes 7, 8) full - 1100 2000 ns driver enable from shutdown to output low t zl(shdn) c l = 100pf, sw = v cc , (figure 3, notes 7, 8) full - 1000 2000 ns receiver enable from shutdown to output high t zh(shdn) c l = 15pf, sw = gnd, (figure 5, notes 7, 9) full - 900 2000 ns receiver enable from shutdown to output low t zl(shdn) c l = 15pf, sw = v cc , (figure 5, notes 7, 9) full - 900 2000 ns esd performance rs-485 pins (a/y, b/z) human body model 25 - 15 - kv all other pins 25 - > 7-kv notes: 2. currents into device pins are positive; currents out of devi ce pins are negative. voltages ar e referenced to ground unless ot herwise specified. 3. supply current specification is valid for loaded drivers when de = 0v. 4. applies to peak current. see ?typical pe rformance curves? for more information. 5. when testing the isl8487e and isl81487l, keep re = 0 to prevent the device from entering shdn. 6. when testing the isl8487e and isl81487l, the re signal high time must be short enough (typically <200ns) to prevent the device from entering shdn. 7. the isl8487e and isl81487l are put into shutdown by bringing re high and de low. if the inputs are in this state for less than 50ns, the parts are guaranteed not to enter shutdown. if the inputs are in this state for at least 600ns, the parts are guaranteed to have ente red shutdown. see ?low-power shutdown mode? section. 8. keep re = v cc , and set the de signal low time >600ns to ensure that the device enters shdn. 9. set the re signal high time >600ns to ens ure that the device enters shdn. 10. devices meeting these limits are denoted as ?1/8 unit load (1/8 ul)? transceivers. the rs-485 standard allows up to 32 unit loads on the bus, so there can be 256 1/8 ul devices on a bus. electrical specifications test conditions: v cc = 4.5v to 5.5v; unless otherwise specified. typicals are at v cc = 5v, t a = 25 o c, (note 2) (continued) parameter symbol test conditions temp ( o c) min typ max units isl8487e, isl81487l, isl81487e
7 test circuits and waveforms figure 1. driver v od and v oc figure 2a. test circuit figure 2b. measurement points figure 2. driver propagation delay and differential transition times figure 3a. test circuit figure 3b. measurement points figure 3. driver enable and disable times d de di v cc v od v oc r r z y d de di v cc signal generator c l = 100pf r diff z y c l = 100pf out (y) 3v 0v t plh 1.5v 1.5v v oh v ol 50% 50% t phl out (z) t phl v oh v ol 50% 50% t plh diff out (y - z) t r +v od -v od 90% 90% t f 10% 10% di skew = |t plh (y or z) - t phl (z or y)| d de di c l 500 ? z y v cc gnd sw (shdn) for isl8487e and isl81487l only. parameter output re di sw c l (pf) t hz y/z x 1/0 gnd 15 t lz y/z x 0/1 v cc 15 t zh y/z 0 (note 5) 1/0 gnd 100 t zl y/z 0 (note 5) 0/1 v cc 100 t zh(shdn) y/z 1 (note 7) 1/0 gnd 100 t zl(shdn) y/z 1 (note 7) 0/1 v cc 100 signal generator out (y, z) 3v 0v 1.5v 1.5v v oh 0v 2.3v v oh - 0.5v t hz out (y, z) v cc v ol 2.3v v ol + 0.5v t lz de output high output low t zl , t zl(shdn) t zh , t zh(shdn) note 7 note 7 note 7 isl8487e, isl81487l, isl81487e
8 application information rs-485 and rs-422 are diff erential (balanced) data transmission standards for use in long haul or noisy environments. rs-422 is a su bset of rs-485, so rs-485 transceivers are also rs-422 compliant. rs-422 is a point- to-multipoint (multidrop) stan dard, which allows only one driver and up to 10 (assuming one unit load devices) receivers on each bus. rs-485 is a true multipoint standard, which allows up to 32 one unit load devices (any combination of drivers and receivers) on each bus. to allow for multipoint operation, the rs-485 spec requires that drivers must handle bus content ion without sustaining any damage. another important advantage of rs-485 is the extended common mode range (cmr), which specifies that the driver outputs and receiver inputs withstand signals that range from +12v to -7v. rs-422 and rs-485 are intended for runs as long as 4000?, so the wide cmr is necessary to handle ground potential differences, as well as voltages induced in the cable by external fields. receiver features these devices utilize a different ial input receiver for maximum noise immunity and common mode rejection. input sensitivity is 200mv, as required by the rs-422 and rs-485 specifications. receiver input resistance of 96k ? surpasses the rs-422 spec of 4k ? , and is eight times the rs-485 ?unit load (ul)? requirement of 12k ? minimum. thus, these products are known as ?one-eighth ul? transceivers, and there can be up to 256 of these devices on a network while still complying with the rs-485 loading spec. receiver inputs function with common mode voltages as great as 7v outside the power supplies (i.e., +12v and -7v), making them ideal for long networks where induced voltages are a realistic concern. figure 4a. test circuit figure 4b. measurement points figure 4. receiver propagation delay figure 5a. test circuit figure 5b. measurement points figure 5. receiver enable and disable times test circuits and waveforms (continued) signal generator r ro re a b +1.5v 15pf ro 3v 0v t plh 1.5v 1.5v v cc 0v 50% 50% t phl a 1k ? v cc gnd sw (shdn) for isl8487e and isl81487l only. parameter de a sw t hz 0 +1.5v gnd t lz 0-1.5vv cc t zh (note 6) 0 +1.5v gnd t zl (note 6) 0 -1.5v v cc t zh(shdn) (note 7) 0 +1.5v gnd t zl(shdn) (note 7) 0 -1.5v v cc signal generator r ro re a b 15pf ro 3v 0v 1.5v 1.5v v oh 0v 1.5v v oh - 0.5v t hz ro v cc v ol 1.5v v ol + 0.5v t lz re output high output low t zl , t zl(shdn) t zh , t zh(shdn) note 7 note 7 note 7 isl8487e, isl81487l, isl81487e
9 all the receivers include a ?fail-safe if open? function that guarantees a high level receiver output if the receiver inputs are unconnected (floating). receivers easily meet the data rates supported by the corresponding driver, and receiver outputs are three-statable via the active low re input. driver features the rs-485/422 driver is a differential output device that delivers at least 1.5v across a 54 ? load (rs-485), and at least 2v across a 100 ? load (rs-422). the drivers feature low propagation delay skew to maximize bit width, and to minimize emi. driver outputs are three-stat able via the active high de input. the isl8487e and isl81487l driv er outputs are slew rate limited to minimize emi, and to minimize reflections in unterminated or improperly terminated networks. data rate on these slew rate limited versions is a maximum of 250kbps. isl81487e drivers are not limited, so faster output transition times allow data rates of at least 5mbps. data rate, cables, and terminations rs-485/422 are intended for network lengths up to 4000?, but the maximum system data rate decreas es as the transmission length increases. devices operating at 5mbps are limited to lengths less than a few hundred feet, while the 250kbps versions can operate at full data rates with lengths in excess of 1000?. twisted pair is the cable of choice for rs-485/422 networks. twisted pair cables tend to pick up noise and other electromagnetically induce d voltages as common mode signals, which are effectivel y rejected by the differential receivers in these ics. to minimize reflections, proper termination is imperative when using the 5mbps device. short networks using the 250kbps versions need not be terminated, but, terminations are recommended unless power dissipation is an overriding concern. in point-to-point, or point-to-mu ltipoint (single driver on bus) networks, the main cable should be terminated in its characteristic impedance (typically 120 ? ) at the end farthest from the driver. in multi-receiver applications, stubs connecting receivers to the main cable should be kept as short as possible. multipoint (multi-driver) systems require that the main cable be terminated in its characteristic impedance at both ends. stubs connecting a transceiver to the main cable should be kept as short as possible. built-in driver ov erload protection as stated previously, the rs-485 spec requires that drivers survive worst case bus contentions undamaged. these devices meet this requirement via driver output short circuit current limits, and on-chip thermal shutdown circuitry. the driver output stages inco rporate short circuit current limiting circuitry which ensures that the output current never exceeds the rs-485 spec, even at the common mode voltage range extremes. additi onally, these devices utilize a foldback circuit which reduces the short circuit current, and thus the power dissipation, w henever the contending voltage exceeds either supply. in the event of a major short circuit condition, these devices also include a thermal shutdow n feature that disables the drivers whenever the die temperature becomes excessive. this eliminates the power dissipation, allowing the die to cool. the drivers automatical ly re-enable after the die temperature drops about 15 degrees. if the contention persists, the therma l shutdown/re-enable cycle repeats until the fault is cleared. receivers stay operational during thermal shutdown. low power shutdown mode (excluding isl81487e) these cmos transceivers all use a fraction of the power required by their bipolar c ounterparts, but the isl8487e and isl81487l include a shutdown feature that reduces the already low quiescent i cc to a 1na trickle. they enter shutdown whenever the re ceiver and driver are simultaneously disabled (re =v cc and de = gnd) for a period of at least 600ns. disabl ing both the driver and the receiver for less than 50ns g uarantees that shutdown is not entered. note that receiver and driver enable times increase when enabling from shutdown. refer to notes 5-9, at the end of the electrical specification table, for more information. esd protection all pins on these interface devices include class 3 human body model (hbm) esd prot ection structures, but the rs-485 pins (driver outputs and receiver inputs) incorporate advanced structur es allowing them to survive esd events in excess of 15kv hbm. the rs-485 pins are particularly vulnerable to esd damage because they typically connect to an exposed port on the exterior of the finished product. simply t ouching the port pins, or connecting a cable, can caus e an esd event that might destroy unprotected ics. these new esd structures protect the device whether or not it is powered up, protect without allowing any latchup mechanism to activate, and without degrading the rs-485 common mode range of -7v to +12v. this built-in esd protection eliminates the need for board level protection st ructures (e.g., transient suppression diodes), and th e associated, undesirable capacitive load they present. isl8487e, isl81487l, isl81487e
10 human body model testing as the name implies, this test method emulates the esd event delivered to an ic during human handling. the tester delivers the charge stored on a 100pf capacitor through a 1.5k ? current limiting resistor into the pin under test. the hbm method determines an ics ability to withstand the esd events typically present during handling and manufacturing. the rs-485 pin survivability on this high esd family has been characterized to be in excess of 15kv, for discharges to gnd. typical performance curves v cc = 5v, t a = 25 o c, isl8487e, isl81487l and isl81487e; unless otherwise specified figure 6. driver output current vs differential output voltage figure 7. driver differen tial output voltage vs temperature figure 8. driver output current vs short circuit voltage figure 9. supply current vs temperature differential output voltage (v) driver output current (ma) 012345 0 10 20 30 40 50 60 70 80 90 -40 0 50 85 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 temperature ( o c) differential output voltage (v) -25 25 75 r diff = 54 ? r diff = 100 ? output voltage (v) -7 -6 -4 -2 0 2 4 6 8 10 12 output current (ma) -60 -40 -20 0 20 40 60 80 100 120 140 160 -80 -100 -120 y or z = high y or z = low isl81487e isl81487e isl8487e, isl81487l isl8487e, isl81487l 50 100 150 200 250 300 350 -40 0 50 85 temperature ( o c) i cc ( a) -25 25 75 isl81487e, de = v cc , re = x isl8487e, isl81487l, de = v cc , re = x isl81487e, de = gnd, re = x isl8487e, isl81487l, de = gnd, re = gnd isl8487e, isl81487l, isl81487e
11 figure 10. driver propagation delay vs temperature (isl8487e, isl81487l) figure 11. driver skew vs temperature (isl8487e, isl81487l) figure 12. driver propagation delay vs temperature (isl81487e) figure 13. driver skew vs temperature (isl81487e) figure 14. driver and receiver waveforms, low to high (isl8487e, isl81487l) figure 15. driver and receiver waveforms, high to low (isl8487e, isl81487l) typical performance curves v cc = 5v, t a = 25 o c, isl8487e, isl81487l and isl81487e; unless otherwise specified (continued) -40 0 50 85 temperature ( o c) -25 25 75 propagation delay (ns) t plhy t phly t plhz t phlz 450 500 550 600 650 700 750 -40 0 50 85 temperature ( o c) skew (ns) -25 25 75 |t plhy - t phlz | |t phly - t plhz | |cross pt. of y & z - cross pt. of y & z | 0 50 100 150 200 250 -40 0 50 85 temperature ( o c) -25 25 75 t plhy t phlz propagation delay (ns) t plhz 16 18 20 22 24 26 28 30 t phly -40 0 50 85 temperature ( o c) skew (ns) -25 25 75 |t plhy - t phlz| |t phly - t plhz| |crossing pt. of y & z - crossing pt. of y & z | 0 1 2 3 4 5 time (400ns/div) 0 receiver output (v) 3 4 1 2 r diff = 54 ? , c l = 100pf 0 5 driver output (v) 0 5 driver input (v) di ro a/y b/z 0 5 isl81487l isl8487e ro time (400ns/div) 0 receiver output (v) 3 4 1 2 r diff = 54 ? , c l = 100pf 0 5 driver output (v) 0 5 driver input (v) di ro a/y b/z 0 5 isl81487l isl8487e ro isl8487e, isl81487l, isl81487e
12 die characteristics substrate potential (powered up): gnd transistor count: 518 process: si gate cmos figure 16. driver and receiver waveforms, low to high (isl81487e) figure 17. driver and receiver waveforms, high to low (isl81487e) typical performance curves v cc = 5v, t a = 25 o c, isl8487e, isl81487l and isl81487e; unless otherwise specified (continued) time (20ns/div) 0 receiver output (v) 3 4 1 2 r diff = 54 ? , c l = 100pf 0 5 driver output (v) 0 5 driver input (v) di ro a/y b/z time (20ns/div) 0 receiver output (v) 3 4 1 2 r diff = 54 ? , c l = 100pf 0 5 driver output (v) 0 5 driver input (v) di ro a/y b/z isl8487e, isl81487l, isl81487e
13 dual-in-line plastic packages (pdip) c l e e a c e b e c -b- e1 index 12 3 n/2 n area seating base plane plane -c- d1 b1 b e d d1 a a2 l a 1 -a- 0.010 (0.25) c a m bs notes: 1. controlling dimensions: inch. in case of conflict between english and metric dimensions, the inch dimensions control. 2. dimensioning and tolerancing per ansi y14.5m - 1982. 3. symbols are defined in the ?mo se ries symbol list? in section 2.2 of publication no. 95. 4. dimensions a, a1 and l are m easured with the package seated in jedec seating plane gauge gs - 3. 5. d, d1, and e1 dimensions do not include mold flash or protru- sions. mold flash or protrusi ons shall not exceed 0.010 inch (0.25mm). 6. e and are measured with the leads constrained to be per- pendicular to datum . 7. e b and e c are measured at the lead tips with the leads uncon- strained. e c must be zero or greater. 8. b1 maximum dimensions do not include dambar protrusions. dambar protrusions shall not exceed 0.010 inch (0.25mm). 9. n is the maximum number of terminal positions. 10. corner leads (1, n, n/2 and n/2 + 1) for e8.3, e16.3, e18.3, e28.3, e42.6 will have a b1 dimension of 0.030 - 0.045 inch (0.76 - 1.14mm). e a -c- e8.3 (jedec ms-001-ba issue d) 8 lead dual-in-line plastic package symbol inches millimeters notes min max min max a - 0.210 - 5.33 4 a1 0.015 - 0.39 - 4 a2 0.115 0.195 2.93 4.95 - b 0.014 0.022 0.356 0.558 - b1 0.045 0.070 1.15 1.77 8, 10 c 0.008 0.014 0.204 0.355 - d 0.355 0.400 9.01 10.16 5 d1 0.005 - 0.13 - 5 e 0.300 0.325 7.62 8.25 6 e1 0.240 0.280 6.10 7.11 5 e 0.100 bsc 2.54 bsc - e a 0.300 bsc 7.62 bsc 6 e b - 0.430 - 10.92 7 l 0.115 0.150 2.93 3.81 4 n8 89 rev. 0 12/93 isl8487e, isl81487l, isl81487e
14 all intersil u.s. products are manufactured, asse mbled and tested utilizing iso9000 quality systems. intersil corporation?s quality ce rtifications can be viewed at www.intersil.com/design/quality intersil products are sold by description only. intersil corporation reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that da ta sheets are current before placing orders. information furnishe d by intersil is believed to be accurate and reliable. however, no responsibility is assumed by intersil or its subsidiaries for its use; nor for any infringements of paten ts 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 subsidiari es. for information regarding intersil corporation and its products, see www.intersil.com small outline plast ic packages (soic) 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) h x 45 o c h 0.25(0.010) b m m 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 0.15mm (0.006 inch) per side. 4. dimension ?e? does not include in terlead flash or protrusions. inter- lead flash and protrusions shall not exceed 0.25mm (0.010 inch) per side. 5. the chamfer on the body is optional. if it is not present, a visual index 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. the lead width ?b?, as measured 0.36mm (0.014 inch) or greater above the seating plane, shall not exceed a maximum value of 0.61mm (0.024 inch). 10. controlling dimension: millimete r. converted inch dimensions are not necessarily exact. m8.15 (jedec ms-012-aa issue c) 8 lead narrow body small outline plastic package symbol inches millimeters notes min max min max a 0.0532 0.0688 1.35 1.75 - a1 0.0040 0.0098 0.10 0.25 - b 0.013 0.020 0.33 0.51 9 c 0.0075 0.0098 0.19 0.25 - d 0.1890 0.1968 4.80 5.00 3 e 0.1497 0.1574 3.80 4.00 4 e 0.050 bsc 1.27 bsc - h 0.2284 0.2440 5.80 6.20 - h 0.0099 0.0196 0.25 0.50 5 l 0.016 0.050 0.40 1.27 6 n8 87 0 o 8 o 0 o 8 o - rev. 0 12/93 isl8487e, isl81487l, isl81487e

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