Active RS-422/RS-485 receiver for industrial comms
The MAX14891EATP+T is an active-production RS-422/RS-485 receiver IC from Analog Devices, supplied in a 20-TQFN (4x4 mm) package. It provides four receiver channels with no integrated drivers (0/4 configuration), targeting multi-drop bus interfaces where only receive-side termination is needed.
Receiver hysteresis and bus margin
The 230 mV receiver hysteresis sets the noise margin between logic thresholds — on a long RS-485 stub with ground-potential shifts or cable reflections, this hysteresis prevents the output from chattering on a slowly rising differential signal. The 35 Mbps data rate supports high-speed polling cycles on a factory-floor fieldbus segment without bit-error accumulation.
Supply rail and temperature grade
Operating from a single 4.5V to 5.5V rail, the receiver draws its bias from the same 5V supply that powers the bus transceiver side.
Package and board integration
Surface-mount assembly with the exposed pad soldered to the PCB copper is assumed in the thermal design.