Meets EIA RS-485 standard 5 Mbps data rate Single 5 V supply –7 V to 12 V bus common-mode range High speed, low power BiCMOS Thermal shutdown protection Short-circuit protection Driver propagation delay: 10 ns typical Receiver propagation delay: 15 ns typical High-Z outputs with power off Superior upgrade for LTC485

The ADM2483 differential bus transceiver is a galvanically separated integrated component designed for bidirectional data transfer over balanced multipoint bus transmission lines. It meets ANSI EIA/TIA-485-A and ISO 8482: 1987 standards (E). The ADM2483 combines a 3-channel isolator, a three-state differential line driver, and a differential input receiver into a single device using Analog Devices, Inc.'s iCoupler technology. The logic side of the device is powered by either a 5 V or 3 V source, while the bus side is supplied only by a 5 V supply. To prevent reflections caused by poorly terminated transmission lines, the ADM2483 is slew-limited. The data rate is limited to 500 kbps due to the restricted slew rate. The input impedance of the device is 96 k, enabling up to 256 transceivers on the bus. Internally, the driver differential outputs and receiver differential inputs comprise a differential input/output (I/O) port. When the driver is deactivated or VDD1 or VDD2 = 0 V, the bus is under minimum load. There is also an active-high receiver disable function, which forces the receive output to enter a high impedance condition. When the receiver inputs are open or shorted, a real fail-safe feature provides a logic-high receiver output level. This ensures that the receiver outputs are in a known condition before and after communication begins and terminates.