Ultralow Power RS-485/RS-422 Transceiver

The ADM1487 is an ultralow power RS-485/RS-422 transceiver consisting of one driver and one receiver per package. Quiescent operating current is typically 80 µA and 1 µA in shutdown mode. The driver and receiver both have three-state outputs. This allows multiple drivers to be connected to an RS-485/RS-422 bus or several receiver outputs to be connected to a serial data bus. The driver will maintain a high impedance output state even with power off, while the receiver features fail-safe operation that guarantees a logic high output if the inputs are left open circuit.

The device has slew rate limited drivers to minimize electromagnetic interference (EMI) and reduce reflections caused by incorrectly terminated cable.

* 250 kbps data rate * Glitch-free driver power-up allows hot connection * Driver maintains high output impedance with power off * Low power—120 µA max ICC with driver disabled * High input impedance—up to 256 transceivers on bus