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參數資料
| 型號： | 24C44 |
| 英文描述： | 256-Bit Serial Nonvolatile CMOS Static RAM |
| 中文描述： | 256位串行非易失性的CMOS靜態RAM |
| 文件頁數： | 1/8頁 |
| 文件大小： | 44K |
| 代理商： | 24C44 |
1
CAT24C44
256-Bit Serial Nonvolatile CMOS Static RAM
FEATURES
I
Single 5V Supply
I
Infinite E
2
PROM to RAM Recall
I
CMOS and TTL Compatible I/O
I
Low CMOS Power Consumption:
–Active: 3 mA Max.
–Standby: 30
μ
A Max.
I
Power Up/Down Protection
I
10 Year Data Retention
I
JEDEC Standard Pinouts:
–8-pin DIP
–8-pin SOIC
I
100,000 Program/Erase Cycles (E
2
PROM)
I
Auto Recall on Power-up
I
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 E
2
PROM array which allows for easy trans-
fer of data from RAM array to E
2
PROM (STORE) and
from E
2
PROM to RAM (RECALL). STORE operations
are completed in 10ms max. and RECALL operations
typically within 1.5
μ
s. The CAT24C44 features unlimited
RAM write operations either through external RAM
writes or internal recalls from E
2
PROM. Internal false
PIN CONFIGURATION
store protection circuitry prohibits STORE operations
when V
CC
is less than 3.5V (typical) ensuring E
2
PROM
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 (E
2
PROM) 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
V
CC
+5V
V
SS
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
STORE
RECALL
VSS
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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