CAT24C44GL-TE13 CATALYST [Catalyst Semiconductor], CAT24C44GL-TE13 Datasheet - Page 6

• Manufacturer Part Number: CAT24C44GL-TE13
• Description: 256-Bit Serial Nonvolatile CMOS Static RAM
• Manufacturer: CATALYST [Catalyst Semiconductor]

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).
Doc. No. 1083, Rev. R
DO
SK
CE
CE
SK
DI
DI
SK CYCLE #
V IH
x
6
t DS
t CES
t SKH
HIGH-Z
1
7
1/F SK
t DH
t SKL
t PD
2
8
6
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.
t CEH
D0
n
9
t PD
D1
10
t CDS
Dn
11
Characteristics subject to change without notice
© 2005 by Catalyst Semiconductor, Inc.
t Z
HIGH-Z