MAX487EESA [Analog Devices]

The MAX481E, MAX483E, MAX485E, MAX487E–MAX491E, and MAX1487E are low-power transceivers for RS-485 and RS-422 communications in harsh environments. Each driver output and receiver input is protected against ±15kV electro-static discharge (ESD) shocks without latchup. These parts contain one driver and one receiver. Some models feature reduced slew-rate drivers to minimize EMI and reduce reflections, allowing error-free data transmission up to 250kbps, while others support up to 2.5Mbps. They draw as little as 120µA supply current when unloaded, with a low-current shutdown mode consuming only 0.5µA for MAX481E, MAX483E, and MAX487E. All parts operate from a single +5V supply. Drivers are short-circuit current limited and protected by thermal shutdown. The receiver input has a fail-safe feature that guarantees a logic-high output if the input is open circuit. MAX487E and MAX1487E feature quarter-unit-load receiver input impedance, allowing up to 128 transceivers on the bus.