RS232 transceiver — 4/5 driver/receiver count and full-duplex bus
The TRS213IDB is a full-duplex RS232 transceiver from Texas Instruments, integrating four drivers and five receivers in a 28-pin SSOP package. The 4/5 split means the bus supports three additional receive lines beyond the standard transmit pair — useful for monitoring handshake signals (RTS, CTS, DSR, DCD) without external level shifters. Data rate is specified at 120 Kbps, which covers legacy RS232 traffic up to 115.2 Kbps with margin. The 500 mV receiver hysteresis filters noise on long cable runs — a common issue in factory-floor serial links where ground potential differences couple into the line.
Package and board-fit — 28-SSOP with 0.209-inch body width
Housed in a 28-SSOP (0.209-inch, 5.30 mm width) with the supplier device package designated 28-SSOP. Supplied in tube packaging — not tape-and-reel — so the pick-and-place feeder must handle tube-to-tray transfer. The tube quantity is typically 47 per tube for this body size (verify per reel count with your assembler).