Datasheet

DS1556 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM
15 of 18
POWER-UP/DOWN CHARACTERISTICS—5V
(V
CC
= 5.0V 10%, Over the Operating Range.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CE or WE at V
IH
, 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
SO
t
FB
10
s
V
CC
Rise Time: V
PF(MIN)
to V
PF(MAX)
t
R
0
s
V
PF
to RST High
t
REC
40 200 ms
Expected Data-Retention Time
(Oscillator On)
t
DR
(Notes 6, 7) 10 years
Figure 8. Power-Up/Down Waveform Timing (5V Device)