Quad RS-232 receiver — what the 120Kbps and hysteresis mean for the line
The MAX1489ECSD+T: Rated at 120Kbps, this receiver supports standard RS-232 data rates up to 115.2 kbps with margin — the 1.11 V of receiver hysteresis filters out noise on long cable runs, so a 15-meter RS-232 cable in an industrial control cabinet won't glitch on coupled motor-drive noise.
Operates from a single 4.5V to 5.5V supply — a clean 5V rail from a linear regulator or a 5V bus in a PLC backplane. Housed in a 14-SOIC (0.154-inch width, 3.90 mm body) surface-mount package — standard footprint for hand-assembly or rework with a hot-air station.