256-Bit Serial Nonvolatile CMOS Static RAM
Description
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: 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
–Active: 3 mA Max.
–Standby: 30 µA Max.
s Power Up/Down Protection s 10 Year Data Retention
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 transfer 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.
5µs.
The CAT24C44 features unlimited RAM write operations either through external RAM writes or internal recalls from E2PROM.
Internal false 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 advanced 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 packages.
PIN CONFIGURATION
DIP Package (P)
CE SK DI DO 1 2 3 4 8 7 6 5 VCC STORE RECALL VSS
PIN FUNCTIONS
Pin Name
SOIC Package (S)
CE SK DI DO 1 2 3 4 8 7 6 5 VCC STORE RECALL VSS
5157 FHD F01
Function Serial Clock Serial Input Serial Data Output Chip Enable Recall Store +5V Ground
SK DI DO CE RECALL STORE VCC VSS
© 1998 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc.
No.
25019-0A 2/98 N-1
1
CAT24C44
BLOCK DIAGRAM
E2PROM ARRAY RECALL ROW DECODE STATIC RAM ARRAY 256-BIT STORE CONTROL LOGIC STORE RECALL
CE DI SK INSTRUCTION REGISTER COLUMN DECODE DO VCC VSS INSTRUCTION DECODE 4-BIT COUNTER
5157 FHD F09...
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