CAT24C44GL-TE13 CATALYST [Catalyst Semiconductor], CAT24C44GL-TE13 Datasheet - Page 7

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

Data is transferred from the EEPROM data memory to
RAM by either sending the RCL instruction or by pulling
the RECALL input pin low. A recall operation must be
performed before the EEPROM store, or RAM write
operations can be executed. Either a hardware or soft-
ware recall operation will set the “previous recall” latch
internal to the CAT24C44.
POWER-ON RECALL
The CAT24C44 has a power-on recall function that
transfers the EEPROM data to the RAM. After Power-
up, all functions are inhibited for at least 200ns (T
from stable V
Data in the RAM memory area is stored in the EEPROM
memory either by sending the STO instruction or by
pulling the STORE input pin low. As security against any
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
RECALL
RECALL
RECALL
STORE
STORE
STORE
RECALL
RECALL
STORE
STORE
RECALL
STORE
DO
cc
DO
.
t RCZ
t STZ
pur
)
t RCP
7
HIGH-Z
inadvertent store operations, the following conditions
must each be met before data can be transferred into
nonvolatile storage:
• The “previous recall” latch must be set (either a
• The “write enable” latch must be set (WREN
• STO instruction issued or STORE input low.
During the store operation, all other CAT24C44 func-
tions are inhibited. Upon completion of the store opera-
tion, the “write enable” latch is reset. The device also
provides false store protection whenever V
a 3.5V level. If V
operation is disabled and the “write enable” latch is
reset.
t STP
t RCC
software or hardware recall operation).
instruction issued).
HIGH-Z
t ST
t ORC
CC
falls below this level, the store
t ARC
UNDEFINED DATA
VALID DATA
Doc. No. 1083, Rev. R
CC
falls below