RS-232 transceiver with 250 kbps — the bus-speed ceiling
The 250 kbps data rate is the line-speed limit — fine for legacy serial ports, terminal interfaces, and industrial controllers that don't push past 115.2 kbps. If your design expects 1 Mbps handshaking, the MAX3232E family (1 Mbps rated) is the next step up, though the pinout and supply range are shared.
Receiver hysteresis is specified at 300 mV, which gives clean logic transitions on a noisy RS-232 bus — useful in factory-floor or motor-drive environments where common-mode noise couples into the cable.