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CAT24C44 Datasheet(PDF) 4 Page - Catalyst Semiconductor

Part No. CAT24C44
Description  256-Bit Serial Nonvolatile CMOS Static RAM
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Manufacturer  CATALYST [Catalyst Semiconductor]
Direct Link  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT24C44 Datasheet(HTML) 4 Page - Catalyst Semiconductor

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CAT24C44
Doc. No. 25019-0A 2/98 N-1
A.C. CHARACTERISTICS
VCC = 5V ±10%, unless otherwise specified.
Symbol
Parameter
Min.
Max.
Units
Conditions
FSK
SK Frequency
DC
1
MHz
tSKH
SK Positive Pulse Width
400
ns
tSKL
SK Negative Pulse Width
400
ns
CL = 100pF + 1TTL gate
tDS
Data Setup Time
400
ns
VOH = 2.2V, VOL = 0.65V
tDH
Data Hold Time
80
ns
VIH = 2.2V, VIL = 0.65V
tPD
SK Data Valid Time
375
ns
Input rise and fall times = 10ns
tZ
CE Disable Time
1
µs
tCES
CE Enable Setup Time
800
ns
tCEH
CE Enable Hold Time
400
ns
tCDS
CE De-Select Time
800
ns
A.C. CHARACTERISTICS, Store Cycle
VCC = 5V ±10%, unless otherwise specified.
Limits
Symbol
Parameter
Min.
Max.
Units
Conditions
tST
Store Time
10
ms
CL = 100pF + 1TTL gate
tSTP
Store Pulse Width
200
ns
VOH = 2.2V, VOL = 0.65V
tSTZ
Store Disable Time
100
ns
VIH = 2.2V, VIL = 0.65V
A.C. CHARACTERISTICS, Recall Cycle
VCC = 5V ±10%, unless otherwise specified.
Symbol
Parameter
Min.
Max.
Units
Conditions
tRCC
Recall Cycle Time
2.5
µs
tRCP
Recall Pulse Width
500
ns
CL = 100pF + 1TTL gate
tRCZ
Recall Disable Time
500
ns
VOH = 2.2V, VOL = 0.65V
tORC
Recall Enable Time
10
ns
VIH = 2.2V, VIL = 0.65V
tARC
Recall Data Access Time
1.5
µs
INSTRUCTION SET
Format
Instruction
Start Bit
Address
OP Code
Operation
WRDS
1
XXXX
0 0 0
Reset Write Enable Latch (Disables, Writes and Stores)
STO
1
XXXX
0 0 1
Store RAM Data in E2PROM
WRITE
1
AAAA
0 1 1
Write Data into RAM Address AAAA
WREN
1
XXXX
1 0 0
Set Write Enable Latch (Enables, Writes and Stores)
RCL
1
XXXX
1 0 1
Recall E2PROM Data into RAM
READ
1
AAAA
1 1 X
Read Data From RAM Address AAAA
X = Don’t care
A = Address bit


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