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CAT24C44 Datasheet(PDF) 2 Page - Catalyst Semiconductor

Part No. CAT24C44
Description  256-Bit Serial Nonvolatile CMOS Static RAM
Download  8 Pages
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Maker  CATALYST [Catalyst Semiconductor]
Homepage  http://www.catalyst-semiconductor.com
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CAT24C44 Datasheet(HTML) 2 Page - Catalyst Semiconductor

   
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CAT24C44
Doc. No. 25019-0A 2/98 N-1
POWER-UP TIMING(4)
Symbol
Parameter
Min.
Max.
Units
VCCSR
VCC Slew Rate
0.5
0.005
V/m
tpur
Power-Up to Read Operations
200
µs
tpuw
Power-Up to Write or Store Operation
5
ms
MODE SELECTION(1)(2)
Software
Write Enable
Previous Recall
Mode
STORE
STORE
STORE
STORE
STORE
RECALL
RECALL
RECALL
RECALL
RECALL
Instruction
Latch
Latch
Hardware Recall(3)
1
0
NOP
X
X
Software Recall
1
1
RCL
X
X
Hardware Store(3)
0
1
NOP
SET
TRUE
Software Store
1
1
STO
SET
TRUE
X = Don’t Care
BLOCK DIAGRAM
5157 FHD F09
ROW
DECODE
INSTRUCTION
REGISTER
COLUMN
DECODE
E
2PROM ARRAY
STORE
RECALL
STATIC RAM
ARRAY
256-BIT
STORE
RECALL
CE
DI
SK
INSTRUCTION
DECODE
4-BIT
COUNTER
CONTROL
LOGIC
VCC
VSS
DO
Note:
(1) The store operation has priority over all the other operations.
(2) The store operation is inhibited when VCC is below ≈ 3.5V.
(3) NOP designates that the device is not currently executing an instruction.
(4) This parameter is tested initially and after a design or process change that affects the parameter.


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