CAT24C44 datasheet(6/8 Pages) CATALYST

Part #	CAT24C44

Description	256-Bit Serial Nonvolatile CMOS Static RAM

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Manufacturer	CATALYST [Catalyst Semiconductor]

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CAT24C44

Doc. No. 25019-0A 2/98 N-1

WREN/WRDS

The CAT24C44 powers up in the program disable state

(the “write enable latch” is reset). Any programming

after power-up or after a WRDS (RAM write/E2PROM

store disable) instruction must first be preceded by the

WREN (RAM write/E2PROM store enable) instruction.

Once writing/storing is enabled, it will remain enabled

until power to the device is removed, the WRDS instruc-

tion is sent, or an E2PROM store has been executed

5157 FHD F05

Figure 4. Write Cycle Timing

Figure 3. Read Cycle Timing

5157 FHD F04

x

12n

SK

CE

tSKL

tSKH

1/FSK

tCEH

tDH

tDS

tCES

tCDS

DI

HIGH-Z

tPD

6789

10

11

tPD

tZ

VIH

HIGH-Z

SK CYCLE #

SK

CE

DI

DO

D0

D1

Dn

(STO). The WRDS (write/store disable) can be used to

disable all CAT24C44 programming functions, and will

prevent any accidental writing to the RAM, or storing to

the E2PROM.

Data can be read normally from the CAT24C44 regard-

less of the “write enable latch” status.

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