The MAX3243CDBR is a Texas Instruments RS232 full-duplex transceiver in a 28-SSOP package. It integrates three drivers and five receivers, supporting a 250kbps data rate across a 3V to 5.5V supply range.
28-SSOP package and board-fit
Housed in a 28-SSOP (0.209", 5.30mm width) surface-mount package — the 0.65mm pitch typical of SSOP-28 demands a 2-layer board with adequate trace breakout under the body. The supplier device package is 28-SSOP, so the land pattern is consistent across TI's SSOP-28 RS232 parts.
Driver/receiver count and receiver hysteresis
With three drivers and five receivers, the MAX3243CDBR handles a typical DB9 RS232 port (TxD, RxD, RTS, CTS, DSR, DCD, RI, DTR) plus a spare receiver channel. The 300 mV receiver hysteresis provides noise immunity on long cable runs — the threshold band rejects line noise below that level without external filtering.