General Description
The F81438 is programmable, monolithic multi-protocol transceiver device that contains RS-232 and RS-485 / RS-422 drivers and receivers. The F81438 can be reconfigured into four operating modes including RS-232 only (3TX/5RX), one RS-485 (1TX/1RX) driver (TX) half duplex mode, one RS-485 (1TX/1RX) receiver (RX) half duplex mode, and RS-422 (1TX/1RX) full duplex mode which can be selected whenever you need by changing the logic state of the 2 mode selection pins. The device can implement a dual-mode serial port, mixed mode ports or as an interface signal translator. The extra charge pumps deliver true RS-232 driver output voltage from a single power supply at 5V. A slew rate control pin configures driver outputs for either high data rate or slew-controlled data rates. Slew-controlled outputs minimize the problems that caused by the reflections and ringing on long or un-terminated cables.

FEATURE List
◾ 5V Single Supply Operation
◾ Robust ±15kV ESD Protection (IEC 61000-4-2 Air Gap)
◾ Mixed RS-232 / RS-485 Modes
◾ Adjustable Slew Rate for Minimize EMI Error
◾ RS-485 Advance Failsafe on Open, Short or Terminated Lines
◾ 28 Pin TSSOP Packaging
◾ Flexible 4 Operation Modes Selected by 2 Configuration Pins
◾ One set of 3T5R RS-232 V.28 Drivers & Receivers
◾ One Set of RS-485 Drivers (Half Duplex Configuration)
◾ One Set of RS-485 Receivers (Half Duplex Configuration)
◾ One set of RS-422 Driver & Receiver (Full Duplex Configuration)