ADM1487E 5 V, ±15 kV ESD Protected, Half Duplex RS-485/RS-422 Transceiver (2.5 Mbps, ¼ Load)

The ADM485E/ADM487E/ADM1487E are 5 V low power data transceivers with ±15 kV ESD protection suitable for halfduplex communication on multipoint bus transmission lines. They are designed for balanced data transmission and comply with TIA/EIA standards RS-485 and RS-422. The ADM487E and the ADM1487E have a 1/4 unit load receiver input impedance that allows up to 128 transceivers on a bus, while the ADM485E allow up to 32 transceivers on a bus. Since only one driver is enabled at any time, the output of a disabled or powerdown driver is three-stated to avoid overloading the bus. The driver outputs are slew rate-limited in order to reduce EMI and data errors caused by reflections from improperly terminated buses. Excessive power dissipation caused by bus contention or output shorting is prevented with a thermal shutdown circuit. The parts are fully specified over the industrial temperature ranges and are available in 8-lead SOIC packages. Applications Energy/power metering Lighting systems Industrial control Telecommunications Security systems Instrumentation

Applications

Energy/power metering
Lighting systems
Industrial control
Telecommunications
Security systems
Instrumentation

Features and Benefits

TIA/EIA RS-485/RS-422 compliant
ESD protection on RS-485 I/O pins
±15 kV human body model
Data rates: 2.5 Mbps
Half-duplex options

Reduced slew rates for low EMI
−7 V to +12 V common-mode input range
Thermal shutdown and short-circuit protection
8-lead SOIC packages

Interface & Isolation

Interface RS-485 and RS-422

Data Sheets

Document	note
ADM485E/ADM487E/ADM1487E: 5 V, 15 kV ESD Protected Half-Duplex, RS-485/RS-422 Transceivers Data Sheet (Rev. B)	PDF 757 kB

Application Notes

Document	note
AN-1176: Component Footprints and Symbols in the Binary .Bxl File Format (Rev. 0)	PDF 671 kB
AN-960: RS-485/RS-422 Circuit Implementation Guide (Rev. 0)	PDF 245 kB