FM3570

The Fairchild FM3570 replaces the CPU motherboard's configuration switches with an electronic implementation consisting of a 4/5-bit multiplexed, 1-bit latched port, standard 2-wire bus interface,and non-volatile latches.

The FM3570 multiplexes the I-port input signals with two internal non-volatile registers that can be loaded through the serial port.The multiplexer is selected via the serial port and defaults to the I-port upon power-up. 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 FM3570 has opendrain outputs for easy interface to devices with different V_DD levels.

The serial port is an IIC compatible slave-only interface and supports both 100kbit and 400kbit modes of operation. The port of FM3570 is used to read the I-Port, write data to the internal non-volatile registers and select whether the I-port or one of the internal nonvolatile registers is output to the Y-port. The FM3570 is fabricated with advanced CMOS technology to achieve high density and low power operation.