ADM1487E

www.DataSheet4U.com 5 V, ±15 kV ESD Protected Half-Duplex, RS-485/RS-422 Transceivers ADM485E/ADM487E/ADM1487E FEATURES TIA/EIA RS-485-/RS-422-compliant ESD protection on RS-485 I/O pins ±15 kV human body model Data rates ADM487E: 250 kbps ADM485E/ADM1487E: 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 FUNCTIONAL BLOCK DIAGRAM VCC ADM485E/ ADM487E/ ADM1487E RO RE DE DI D 06356-001 R A B APPLICATIONS Energy/power metering Lighting systems Industrial control Telecommunications Security systems Instrumentation GND Figure 1. GENERAL DESCRIPTION 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 Telecommunication Industry Association/Electronics Industries Association (TIA/EIA) standards RS-485 and RS-422. The ADM487E and ADM1487E have a 1/4 unit load receiver input impedance that allows up to 128 transceivers on a bus, whereas the ADM485E allows up to 32 transceivers on a bus. Because only one driver is enabled at any time, the output of a disabled or power-down driver is three-stated to avoid overloading the bus. The driver outputs are slew rate-limited to reduce EMI and data errors caused by reflections from improperly terminated buses. Excessive power dissipation caused by...