FM31L278/L276/L274/L272 - 3V I2C Companion
Pin Configuration
Pin Name
CNT1, CNT2
A0, A1
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
VDD
SCL
SDA
X2
1
14
13
CNT1
CAL/PFO
2
CNT2
3
12
11
A0
/RST
PFI
4
A1
X1, X2
SDA
SCL
5
10
9
X1
CAL/PFO
6
Serial Clock
PFI
RST
VBAK
VDD
VSS
Battery-Backup Supply
Supply Voltage
7
8
VSS
VBAK
Ground
Ordering Information
Base Configuration Memory Size Operating Voltage Reset Threshold
Ordering Part Number
FM31L278-G
FM31L278
FM31L276
FM31L274
FM31L272
256Kb
256Kb
64Kb
64Kb
16Kb
16Kb
4Kb
2.7-3.6V
2.7-3.6V
2.7-3.6V
2.7-3.6V
2.7-3.6V
2.7-3.6V
2.7-3.6V
2.7-3.6V
2.6V, 2.9V
2.6V, 2.9V
2.6V, 2.9V
2.6V, 2.9V
2.6V, 2.9V
2.6V, 2.9V
2.6V, 2.9V
2.6V, 2.9V
FM31L278-GTR (tape&reel)
FM31L276-G
FM31L276-GTR (tape&reel)
FM31L274-G
FM31L274-GTR (tape&reel)
FM31L272-G
4Kb
FM31L272-GTR (tape&reel)
Other memory configurations may be available. Please contact the factory for more information.
Rev. 3.0
Feb. 2009
Page 2 of 25
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
