FM31278/276/274/272 - 5V I2C Companion
Pin Configuration
CNT1
CNT2
A0
A1
CAL/PFO
RST
VSS
1
2
3
4
5
6
7
14
13
12
11
10
9
8
VDD
SCL
SDA
X2
X1
PFI
VBAK
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
FM31278
FM31276
FM31274
FM31272
Memory Size
256Kb
64Kb
16Kb
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
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
