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FM3565M20X Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FM3565M20X Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 7 page 1 www.fairchildsemi.com www.fairchildsemi.com FM3565 Rev. A.1 FM3565 CPU CONFIGURATION CONTROLLER Register/Multiplexer for Microprocessor VID General Description The Fairchild FM3565 replaces the PC motherboard’s CPU configuration switches with an electronic implementation, consist- ing 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 deter- mined 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. Block Diagram Preliminary March 2001 SOPRA SOPRB IIC Interface Start/Stop Logic Shift Register Slave Address Register Comparator Control Logic Mux3 Mux2 Y [4:0] I [4:0] IIC Read Logic SDA SCL ASEL OVRD MUXSEL A/B MXSB, MXSA Mux1 The serial port is an IIC compatible slave-only interface and supports both 100kbit and 400kbit modes of operation. The port is used to read the I-Port and to write data to the internal non- volatile registers. The FM3565 is fabricated with advanced CMOS technology to achieve high density and low power operation. Features I Extended Operating Voltage Range 3.0V-5.5V I IIC Compatible Slave Interface. I ESD performance: Human body model > 2000V I Open-Drain Outputs © 2001 Fairchild Semiconductor Corporation |
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