Datasheet

DS1553 64kB, Nonvolatile, Year-2000-Compliant Timekeeping RAM
17 of 20
POWER-UP/DOWN CHARACTERISTICS
(V
CC
= 3.3V ±10%, T
A
= Over the operating range.)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
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
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
10 years 6, 7
Figure 9. Power-Up/Down Waveform Timing 3.3V Device
CAPACITANCE
(T
A
= +25°C)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Capacitance on All Input Pins C
IN
7 pF 1
Capacitance on IRQ/FT, RST, and
DQ Pins
C
IO
10 pF 1