RS232 transceiver for 3V to 5.5V rails
The MAX13223EEUP+T is a full-duplex RS232 transceiver from Analog Devices, integrating two drivers and two receivers in a single 20-TSSOP package. It handles data rates up to 250kbps, which covers the standard RS232 band for serial console, modem, and industrial controller links.
Receiver hysteresis and signal integrity
Receiver hysteresis is specified at 500 mV, which provides noise immunity on the RS232 bus. In a factory-floor cable run subject to motor-drive coupling, that margin keeps the receiver from toggling on induced transients below the threshold. Full-duplex operation means the two driver/receiver pairs can transmit and receive simultaneously, as required for a standard RS232 point-to-point link. The 250kbps data rate is sufficient for most legacy serial protocols including Modbus RTU at 115.2 kbaud with headroom.
The supplier device package is listed as 20-TSSOP, matching the package/case entry.