Datasheet

DS1643/DS1643P
11 of 17
POWER-UP/DOWN AC CHARACTERISTICS
(V
CC
= 5.0V 10%, T
A
= 0C to +70C.)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
CE or WE at V
IH
, CE2 at V
IL
, Before
Power-down
t
PD
0
s
V
CC
Fall Time: V
PF(MAX)
to V
PF(MIN)
t
F
300
s
V
CC
Fall Time: V
PF(MIN)
to V
BAT
t
FB
10
s
V
CC
Rise Time: V
PF(MIN)
to V
PF(MAX)
t
R
0
s
Power-Up Recover Time t
REC
35 ms
Expected Data Retention Time
(Oscillator On)
t
DR
10 years 5, 6
POWER-UP/POWER-DOWN TIMING
CAPACITANCE
(T
A
= +25C)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Capacitance on All Pins C
IN
7 pF
Capacitance on All Output Pins C
O
10 pF