Receiver hysteresis and signal integrity
The MAX3232ECDW: The 300 mV receiver hysteresis provides built-in noise rejection on the RS-232 line — a 250 kbps link over a few metres of cable sees enough coupled noise to toggle a comparator without hysteresis, but the 300 mV dead band filters out low-amplitude ringing without external schmitt-trigger buffers.
Housed in a 16-pin SOIC wide-body (7.50 mm body width), the footprint matches the standard SOIC-16W land pattern. The 1.27 mm pitch is layout-friendly on two-layer boards — no micro-vias or fine-line escape needed for the RS-232 signals.