CAT24C44VI-GT3 ON Semiconductor, CAT24C44VI-GT3 Datasheet - Page 7

• Manufacturer Part Number: CAT24C44VI-GT3
• Description: IC NVRAM SERIAL 256BIT 8SOIC
• Manufacturer: ON Semiconductor

Specifications of CAT24C44VI-GT3

• Format - Memory: RAM
• Memory Type: NVSRAM (Non-Volatile SRAM)
• Memory Size: 256 (16 x 16)
• Speed: 1MHz
• Interface: 3-Wire Serial
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

RCL/RECALL
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
STO/STORE
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
Figure 5. Recall Cycle Timing
Figure 6. Hardware Store Cycle Timing
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Characteristics subject to change without notice
RECALL
RECALL
RECALL
RECALL
STORE
STORE
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
software or hardware recall operation).
instruction issued).
t RCC
HIGH-Z
t ST
t ORC
CC
falls below this level, the store
t ARC
UNDEFINED DATA
VALID DATA
Doc. No. MD-1083, Rev. T
CC
CAT24C44
falls below