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PDF FM3570 Datasheet ( Hoja de datos )

Número de pieza FM3570
Descripción CPU CONFIGURATION CONTROLLER Register/Multiplexer for Microprocessor VID
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo

Total 8 Páginas
		
FM3570 Hoja de datos, Descripción, Manual
Preliminary
March 2001
FM3570
CPU CONFIGURATION CONTROLLER
Register/Multiplexer for Microprocessor VID
General Description
The Fairchild FM3570 replaces the CPU motherboard’s 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 VDD
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]
SOPRA
SOPRB
IIC Read Logic
Mux3
SDA
SCL
IIC
Interface
Start/Stop
Logic
Shift
Register
Mux2
MXSB, MXSA
Y[4:0]
Mux1
Control Logic
MUXSEL
OVRD
Slave Address
Register
Comparator
ASEL
© 2001 Fairchild Semiconductor Corporation
FM3570 Rev. A
1
www.fairchildsemi.com

1 page

FM3570 pdf
Absolute Maximum Ratings (Note 1)
Supply Voltage (VCC )
DC Input Voltage (VI)
Output Voltage (VO)
Outputs 3-stated
Outputs Active (Note 2)
DC Input Diode Current (IIK) VI < 0V
DC Output Diode Current (IOK)
VO < 0V
VO > VCC
DC Output Source/Sink Current (IOH/IOL)
DC VCC or Ground Current per
Supply Pin (ICC or Ground)
Storage Temperature Range (TSTG)
-0.5V to +6.5V
-0.5V to +6.5V
-0.5V to +6.5V
-0.5 to VCC+0.5V
-50mA
-50mA
+50mA
±50mA
±100mA
-65°C to +150°C
Recommended Operating Conditions
(Note 3)
Power Supply
3.0V to 5.5V
Input Voltage
-0.3V to 5.5V
Output Voltage (VO)
0V to VCC
Output Current IOL
3mA
Free Air Operating Temperature(TA)
-0°C to +70°C
Minimum Input Edge Rate (dt/dv)
VIN = 0.8V to 2.0V, VCC = 3.0V
10ns/V
Note 1: The Absolute Maximum Ratingsare those values beyond which the safety
of the device cannot be guaranteed. The device should not be operated at these
limits. The parametric values defined in the Electrical Characteristicstable are not
guaranteed at the Absolute Maximum Ratings. The Recommended Operating
Conditionstable will define the conditions for actual device operation.
Note 2: IO Absolute Maximum Rating must be observed.
Note 3: Floating or unused pins (inputs or I/Os) must be held HIGH or LOW.
DC Electrical Characteristics (4.5V < VCC 5.5V unless stated otherwise)
Symbol
Parameter
Conditions
Min
VIH High Level Input Voltage
VIL Low Level Input Voltage
VOL Low Level Output Voltage
IIR Input Leakage Current
ICC Quiescent Supply Current
IOL = 100µA
IOL = 3mA
VI = VIL, VCC = 5.5V
VI = VCC or GND
VCC (VI, VO) 3.6V
VCC x 0.7
-10
300
Max
VCC x 0.3
0.2
0.4
+10
975
Units
V
V
V
µA
µA
DC Electrical Characteristics Extended (3.0V VCC 5.5V unless stated otherwise)
Symbol
Parameter
Conditions
Min Max
VIH High Level Input Voltage
VIL Low Level Input Voltage
VOL Low Level Output Voltage
VOH Output High Voltage
IIR Input Leakage Current
ICC Quiescent Supply Current
IOL = 100µA
IOL = 3mA
VI = VIL, VCC = 5.5V
VCC (VI, VO) 3.6V
VCC x 0.7
2.3
-10
300
VCC x 0.3
0.2
0.4
2.5
+10
975
Units
V
V
V
V
µA
µA
DC Electrical Characteristics I Port Inputs (VCC = 3.3V)
Symbol
Parameter
Conditions
VIH High Level Input Voltage
VIL Low Level Input Voltage
EPV = 2.5V
EPV = 2.5V
Min Max Units
1.2 V
0.5 V
FM3570 Rev. A
5 www.fairchildsemi.com

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