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CAT24C44 Datasheet(PDF) 1 Page - Catalyst Semiconductor

Part No. CAT24C44
Description  256-Bit Serial Nonvolatile CMOS Static RAM
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Manufacturer  CATALYST [Catalyst Semiconductor]
Direct Link  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT24C44 Datasheet(HTML) 1 Page - Catalyst Semiconductor

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CAT24C44
256-Bit Serial Nonvolatile CMOS Static RAM
FEATURES
s Single 5V Supply
s Infinite E2PROM to RAM Recall
s CMOS and TTL Compatible I/O
s Low CMOS Power Consumption:
–Active: 3 mA Max.
–Standby: 30
µA Max.
s Power Up/Down Protection
s 10 Year Data Retention
s JEDEC Standard Pinouts:
–8-pin DIP
–8-pin SOIC
s 100,000 Program/Erase Cycles (E2PROM)
s Auto Recall on Power-up
s Commercial, Industrial and Automotive
Temperature Ranges
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 E2PROM array which allows for easy trans-
fer of data from RAM array to E2PROM (STORE) and
from E2PROM to RAM (RECALL). STORE operations
are completed in 10ms max. and RECALL operations
typically within 1.5
µs. The CAT24C44 features unlimited
RAM write operations either through external RAM
writes or internal recalls from E2PROM. Internal false
PIN CONFIGURATION
store protection circuitry prohibits STORE operations
when VCC is less than 3.5V (typical) ensuring E2PROM
data integrity.
The CAT24C44 is manufactured using Catalyst’s ad-
vanced CMOS floating gate technology. It is designed to
endure 100,000 program/erase cycles (E2PROM) and
has a data retention of 10 years. The device is available
in JEDEC approved 8-pin plastic DIP and SOIC pack-
ages.
PIN FUNCTIONS
Pin Name
Function
SK
Serial Clock
DI
Serial Input
DO
Serial Data Output
CE
Chip Enable
RECALL
Recall
STORE
Store
VCC
+5V
VSS
Ground
SOIC Package (S)
DI
DO
1
2
3
4
CE
SK
RECALL
VSS
VCC
STORE
8
7
6
5
1
2
3
4
8
7
6
5
CE
SK
DI
DO
VCC
RECALL
VSS
STORE
DIP Package (P)
5157 FHD F01
© 1998 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. 25019-0A 2/98 N-1


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