FM31278-G 查看數據表（PDF） - Ramtron International Corporation
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FM31278-G Datasheet PDF : 25 Pages
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Pin Configuration
CNT1
1
14
CNT2
2
13
A0
3
12
A1
4
11
CAL/PFO
5
10
RST
6
9
VSS
7
8
VDD
SCL
SDA
X2
X1
PFI
VBAK
FM31278/276/274/272 - 5V I2C Companion
Pin Name
CNT1, CNT2
A0, A1
CAL/PFO
/RST
PFI
X1, X2
SDA
SCL
VBAK
VDD
VSS
Function
Event Counter Inputs
Device Select inputs
Clock Calibration and Early
Power-Fail Output
Reset Input/Output
Early Power-fail Input
Crystal Connections
Serial Data
Serial Clock
Battery-Backup Supply
Supply Voltage
Ground
Ordering Information
Base Configuration Memory Size
FM31278
256Kb
FM31276
64Kb
FM31274
16Kb
FM31272
4Kb
Operating Voltage
4.0-5.5V
4.0-5.5V
4.0-5.5V
4.0-5.5V
Reset Threshold
3.9, 4.4V
3.9, 4.4V
3.9, 4.4V
3.9, 4.4V
Ordering Part Number
FM31278-G
FM31276-G
FM31274-G
FM31272-G
Other memory configurations may be available. Please contact the factory for more information.
Rev. 2.0
Dec. 2007
Page 2 of 25
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