ADM3485E Datasheet | Analog Devices

EATURES TIA/EIA RS-485/RS-422 pliant ±15 k V ESD protection on RS-485 input/output pins 12 Mbps data rate Half-duplex transceiver Up to 32 nodes on the bus Receiver open-circuit, fail-safe design Low power shutdown current Outputs high-Z when disabled or powered off mon-mode input range: - 7 V to +12 V Thermal shutdown and short-circuit protection Industry-standard 75176 pinout 8-lead narrow SOIC package APPLICATIONS Power/energy metering Telemunications EMI-sensitive systems Industrial control Local area networks GENERAL DESCRIPTION The ADM3485E is a 3.3 V, low power data transceiver with ±15 k V ESD protection, suitable for half-duplex munication on multipoint bus transmission lines. The ADM3485E is designed for balanced data transmission and plies with TIA/EIA standards RS­485 and RS-422. The ADM3485E is a half-duplex transceiver that shares differential lines and has separate enable inputs for the driver and the receiver. The devices have a 12 kΩ receiver input impedance, which allows up to 32 transceivers on a bus. Because only one driver FUNCTIONAL BLOCK DIAGRAM RO R RE DE DI D 03338-001 Figure 1. should be enabled at any time, the output of a disabled or powered-down driver is tristated to avoid overloading the bus. The receiver has a fail-safe feature that ensures a logic high output when the inputs are floating. Excessive power dissipation caused by bus contention or by output shorting is prevented with a thermal shutdown circuit. The part is fully specified over the industrial temperature range and is available in an 8-lead narrow SOIC package. Rev. D Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog...