FM3565

The Fairchild FM3565 replaces the PC motherboard’s CPU configuration switches with an electronic implementation, consisting of a 5-bit multiplexed port, standard 2-wire bus interface, and non-volatile latches with external hardware control.

The FM3565 multiplexes the I-port input signals with two internal non-volatile registers that can be loaded through the serial port.The multiplexer output is under hardware control, and is determined by the inputs OVRD, MUXSEL, and A/B. Pull-up resistors are provided on the input port to accommodate connections to open drain outputs and to eliminate the need for external resistors.The device has open-drain outputs for easy interface to devices with different V_DD Levels.