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FM3565MT20X 数据表(PDF) 1 Page - Fairchild Semiconductor

部件名 FM3565MT20X
功能描述  CPU CONFIGURATION CONTROLLER Register/Multiplexer for Microprocessor VID
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

FM3565MT20X 数据表(HTML) 1 Page - Fairchild Semiconductor

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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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