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3.3V Single-Piece 4Mb Nonvolatile SRAM
with Clock
Power-Down/Power-Up Condition
V CC
V TP
t DR
~ 2.5V
t F
t R
t REC
CE,
WE
AND
CS
BACKUP CURRENT
SUPPLIED FROM
LITHIUM BATTERY
RST
t PD
V OL
t RPD
SLEWS WITH
V CC
t PU
t RPU
V OL
V IH
(SEE NOTES 1, 7.)
Typical Operating Characteristics
(V CC = 3.3V, T A = +25 ° C, unless otherwise noted.)
SUPPLY CURRENT
vs. OPERATING FREQUENCY
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
BATTERY CHARGER CURRENT
vs. BATTERY VOLTAGE
7
6
5
5MHz CE-ACTIVATED
50% DUTY CYCLE
T A = +25°C
1000
900
V CC = CE = 3.3V,
V BAT = V CHARGE ,
OSC = ON
8
7
6
V CC = CE = 3.3V
4
800
5
1MHz CE-ACTIVATED
3
2
5MHz ADDRESS-ACTIVATED
100% DUTY CYCLE
50% DUTY CYCLE
700
4
3
2
600
1
0
1MHz ADDRESS-ACTIVATED
100% DUTY CYCLE
500
1
0
V CHARGE
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.0
3.1
3.2
3.3
3.4
3.5
3.6
0
0.2
0.4
0.6
0.8
1.0
V CC (V)
V CC (V)
DELTA V BELOW V CHARGE (V)
_____________________________________________________________________
7
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