CAT24C44
256-Bit Serial Nonvolatile CMOS Static RAM
FEATURES
s Single 5V Supply
s JEDEC Standard Pinouts:
–8-pin DIP
–8-pin SOIC
s Infinite EEPROM to RAM Recall
s CMOS and TTL Compatible I/O
s 100,000 Program/Erase Cycles (EEPROM)
s Low CMOS Power Consumption:
s Auto Recall on Power-up
–Active: 3 mA Max.
–Standby: 30 µA Max.
s Commercial, Industrial and Automotive
Temperature Ranges
s Power Up/Down Protection
s "Green" Package Options Available
s 10 Year Data Retention
DESCRIPTION
The CAT24C44 Serial NVRAM is a 256-bit nonvolatile
memory organized as 16 words x 16 bits. The high
speed Static RAM array is bit for bit backed up by a
nonvolatile EEPROM array which allows for easy transfer of data from RAM array to EEPROM (STORE) and
from EEPROM to RAM (RECALL). STORE operations
are completed in 10ms max. and RECALL operations
typically within 1.5µs. The CAT24C44 features unlimited RAM write operations either through external RAM
writes or internal recalls from EEPROM. Internal false
store protection circuitry prohibits STORE operations
when VCC is less than 3.5V (typical) ensuring EEPROM
data integrity.
PIN CONFIGURATION
PIN FUNCTIONS
The CAT24C44 is manufactured using Catalyst’s advanced CMOS floating gate technology. It is designed to
endure 100,000 program/erase cycles (EEPROM) and
has a data retention of 10 years. The device is available
in JEDEC approved 8-pin plastic DIP and SOIC packages.
Pin Name
DIP Package (P, L, GL)
SOIC Package (S, V, GV)
Function
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
2
3
4
8
7
6
5
DO
CE
VCC
STORE
RECALL
VSS
1
Serial Data Output
Chip Enable
Recall
Store
+5V
VSS
VCC
CE
STORE SK
RECALL DI
VSS
DO
Serial Input
VCC
8
7
6
5
DI
STORE
1
2
3
4
Serial Clock
RECALL
CE
SK
DI
DO
SK
Ground
Doc. No. 1083, Rev. R
