MAX489EPD+ [Analog Devices]

The MAX481, MAX483, MAX485, MAX487–MAX491, and MAX1487 are low-power transceivers for RS-485 and RS-422 communication. Each part contains one driver and one receiver. Some models feature reduced slew-rate drivers to minimize EMI and reflections, allowing error-free data transmission up to 250kbps, while others support up to 2.5Mbps. They draw between 120µA and 500µA of supply current, with a low-current shutdown mode consuming only 0.1µA. 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. The MAX487 and MAX1487 feature quarter-unit-load receiver input impedance, allowing up to 128 transceivers on the bus. Full-duplex communications are obtained using the MAX488–MAX491, while the MAX481, MAX483, MAX485, MAX487, and MAX1487 are designed for half-duplex applications.