RS-232 line interface with flexible supply
The MAX3243IDW is a full-duplex RS-232 transceiver integrating three drivers and five receivers in a single 28-SOIC package — a common count for multi-port serial interfaces in industrial controllers, point-of-sale terminals, and telecom line cards. Data rate is rated at 250 kbps, which covers standard UART speeds up to 115.2 kbps with margin for the cable capacitance and driver slew rate.
Temperature grade and package fit
The 28-SOIC wide-body (7.50 mm width) footprint is a standard surface-mount package — the same land pattern used by many RS-232 and RS-485 transceivers, so a board layout change is rarely needed when swapping between compatible parts. Receiver hysteresis is specified at 500 mV, which provides noise immunity on the RX line in electrically noisy environments without external Schmitt triggers.