DATASHEET ISL8487, ISL81483, ISL81487 FN6050 Rev 8.00 1/8 Unit Load, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 March 14, 2016 Transceivers These Intersil RS-485/RS-422 devices are fractional unit Features load (UL), BiCMOS, 5V powered, single transceivers that Fractional Unit Load Allows up to 256 Devices on the Bus meet both the RS-485 and RS-422 standards for balanced communication. Unlike competitive devices, this Intersil Specified for 10% Tolerance Supplies family is specified for 10% tolerance supplies (4.5V to 5.5V). Class 3 ESD Protection (HBM) on all Pins >7kV The ISL81483 and ISL81487 present a 1/8 unit load to the High Data Rate Version (ISL81487) . up to 5Mbps RS-485 bus, which allows up to 256 transceivers on the Slew Rate Limited Versions for Error Free Data network for large node count systems (e.g., process Transmission (ISL8487, ISL81483) .up to 250kbps automation, remote meter reading systems). The 1/4 UL ISL8487 allows up to 128 transceivers on the bus. In a Low Current Shutdown Mode (Except ISL81487) 0.5 A remote utility meter reading system, individual (apartments Low Quiescent Supply Current: for example) utility meter readings are routed to a - ISL8487, ISL81483 145A (Max.) concentrator via an RS-485 network, so the high allowed - ISL81487 . 420A (Max.) node count minimizes the number of repeaters required to network all the meters. Data for all meters is then read out -7V to +12V Common Mode Input Voltage Range from the concentrator via a single access port, or a wireless Three State Rx and Tx Outputs link. 30ns Propagation Delays, 5ns Skew (ISL81487) Slew rate limited drivers on the ISL8487 and ISL81483 Half Duplex Pinouts reduce EMI, and minimize reflections from improperly terminated transmission lines, or unterminated stubs in Operate from a Single +5V Supply (10% Tolerance) multidrop and multipoint applications. Data rates up to Current Limiting and Thermal Shutdown for Driver 250kbps are achievable with these devices. Overload Protection Data rates up to 5Mbps are achievable by using the Drop-In Replacements for: MAX487 (ISL8487) MAX1483 ISL81487, which features higher slew rates. (ISL81483) MAX1487, LMS1487 (ISL81487) Receiver (Rx) inputs feature a fail-safe if open design, Pb-Free Plus Anneal Available (RoHS Compliant) which ensures a logic high Rx output if Rx inputs are floating. Applications Driver (Tx) outputs are short circuit protected, even for voltages exceeding the power supply voltage. Additionally, High Node Count Networks on-chip thermal shutdown circuitry disables the Tx outputs to Automated Utility Meter Reading Systems prevent damage if power dissipation becomes excessive. Factory Automation These half duplex devices multiplex the Rx inputs and Tx outputs to allow transceivers with Rx and Tx disable Security Networks functions in 8 lead packages. Building Environmental Control Systems Industrial/Process Control Networks TABLE 1. SUMMARY OF FEATURES RECEIVER/ PART HALF/FULL NO. OF DEVICES DATA RATE SLEW-RATE DRIVER QUIESCENT LOW POWER PIN NUMBER DUPLEX ALLOWED ON BUS (Mbps) LIMITED ENABLE I (A) SHUTDOWN COUNT CC ISL8487 Half 128 0.25 Yes Yes 120 Yes 8 (No longer available or supported) ISL81483 Half 256 0.25 Yes Yes 120 Yes 8 ISL81487 Half 256 5 No Yes 350 No 8 FN6050 Rev 8.00 Page 1 of 14 March 14, 2016ISL8487, ISL81483, ISL81487 Pinout Truth Tables ISL8487, ISL81483, ISL81487 (PDIP, SOIC) TRANSMITTING TOP VIEW INPUTS OUTPUTS RE DE DI Z Y RO 1 8 V CC R X 1101 RE 2 7 B/Z X 1010 DE 3 6 A/Y D 0 0 X High-Z High-Z DI 4 5 GND 1 0 X High-Z * High-Z * *Shutdown Mode for ISL8487, ISL81483 (see Note 7) RECEIVING INPUTS OUTPUT RE DE A-B RO 00 +0.2V 1 00 -0.2V 0 0 0 Inputs Open 1 10 X High-Z * 1 1 X High-Z *Shutdown Mode for ISL8487, ISL81483 (see Note 7) Ordering Information PART NO. PART MARKING TEMP. RANGE (C) PACKAGE PKG. DWG. ISL8487IBZ (Note) (No longer 8487IBZ -40 to 85 8 Ld SOIC* (Pb-free) M8.15 available, recommended replacement ISL8487EIBZ) ISL8487IPZ (Note) (No longer 8487IPZ -40 to 85 8 Ld PDIP** (Pb-free) E8.3 available, recommended replacement ISL8487EIPZ) ISL81483IBZ (Note) 81483IBZ -40 to 85 8 Ld SOIC* (Pb-free) M8.15 ISL81483IPZ (Note) 81483IPZ -40 to 85 8 Ld PDIP** (Pb-free) E8.3 ISL81487IBZ (Note) 81487IBZ -40 to 85 8 Ld SOIC* (Pb-free) M8.15 *SOIC also available in Tape and Reel Add -T to suffix. **Pb-free PDIPs can be used for through hole wave solder processing only. They are not intended for use in Reflow solder processing applications. NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. FN6050 Rev 8.00 Page 2 of 14 March 14, 2016