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FM3570MT20X Datasheet

  • FM3570MT20X

  • CPU CONFIGURATION CONTROLLER Register/Multiplexer for Microp...

  • 8頁

  • FAIRCHILD

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FM3570 CPU CONFIGURATION CONTROLLER
Register/Multiplexer for Microprocessor VID
Preliminary
March 2001
FM3570
CPU CONFIGURATION CONTROLLER
Register/Multiplexer for Microprocessor VID
General Description
The Fairchild FM3570 replaces the CPU motherboard鈥檚 configu-
ration switches with an electronic implementation consisting of a
4/5-bit multiplexed, 1-bit latched port, standard 2-wire bus inter-
face, 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 device has open-
drain 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
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 non-
volatile registers is output to the Y-port. The FM3570 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
Choice of 2.5V Outputs or Open-Drain Outputs
Block Diagram
Non_Mux_Out
I[4:0]
Y[4:0]
Mux1
SOPRA
Mux2
SOPRB
MXSB, MXSA
IIC Read Logic
Mux3
Control Logic
MUXSEL
OVRD
SDA
SCL
IIC
Interface
Shift
Register
Slave Address
Register
ASEL
Comparator
Start/Stop
Logic
漏 2001 Fairchild Semiconductor Corporation
FM3570 Rev. A
1
www.fairchildsemi.com

FM3570MT20X 產(chǎn)品屬性

  • Fairchild Semiconductor

  • 編碼器、解碼器、復(fù)用器和解復(fù)用器

  • 6.3 V

  • + 85 C

  • SMD/SMT

  • TSSOP-20

  • Reel

  • - 30 C

  • 2500

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