FM31278/276/274/272 - 5V I2C Companion
A general-purpose comparator compares an external
input pin to the onboard 1.2V reference. This is
useful for generating a power-fail interrupt (NMI) but
can be used for any purpose. The family also includes
a programmable 64-bit serial number that can be
locked making it unalterable. Additionally it offers a
dual battery-backed event counter that tracks the
number of rising or falling edges detected on
dedicated input pins.
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
CAL/PFO
/RST
PFI
X1, X2
SDA
SCL
Serial Clock
VBAK
VDD
VSS
Battery-Backup Supply
Supply Voltage
Ground
Pin Configuration
VDD
SCL
SDA
X2
1
2
14
13
CNT1
CNT2
A0
3
4
12
11
A1
5
6
7
10
9
X1
CAL/PFO
PFI
RST
VSS
8
VBAK
Ordering Information
Base Configuration Memory Size Operating Voltage Reset Threshold
Ordering Part Number
FM31278-G
FM31278-GTR (tape&reel)
FM31276-G
FM31276-GTR (tape&reel)
FM31274-G
FM31274-GTR (tape&reel)
FM31272-G
FM31278
FM31276
FM31274 *
FM31272 *
256Kb
256Kb
64Kb
64Kb
16Kb
16Kb
4Kb
4.0-5.5V
4.0-5.5V
4.0-5.5V
4.0-5.5V
4.0-5.5V
4.0-5.5V
4.0-5.5V
4.0-5.5V
3.9, 4.4V
3.9, 4.4V
3.9, 4.4V
3.9, 4.4V
3.9, 4.4V
3.9, 4.4V
3.9, 4.4V
3.9, 4.4V
4Kb
FM31272-GTR (tape&reel)
* The FM31274 and FM31272 devices are EOL as of Sept. 2011.
Rev. 2.1
Sept. 2011
Page 2 of 26
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
