CAT24C44GL-TE13 datasheet(6/9 Pages) CATALYST

Part #	CAT24C44GL-TE13

Description	256-Bit Serial Nonvolatile CMOS Static RAM

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Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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6

CAT24C44

Doc. No. 1083, Rev. R

Characteristics subject to change without notice

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/EEPROM store

disable) instruction must first be preceded by the WREN

(RAM write/EEPROM store enable) instruction. Once

writing/storing is enabled, it will remain enabled until

power to the device is removed, the WRDS instruction is

sent, or an EEPROM store has been executed (STO).

Figure 4. Write Cycle Timing

Figure 3. Read Cycle Timing

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

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

EEPROM.

Data can be read normally from the CAT24C44 regard-

less of the “write enable latch” status.

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CAT24C44GL-TE13 Datasheet(PDF) 6 Page - Catalyst Semiconductor

CAT24C44GL-TE13 Datasheet(HTML) 6 Page - Catalyst Semiconductor

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