DS1556 Maxim, DS1556 Datasheet - Page 15

• Manufacturer Part Number: DS1556
• Description: The DS1556 is a full-function, year-2000-compliant (Y2KC), real-time clock/calendar (RTC) with an RTC alarm, watchdog timer, power-on reset, battery monitor, and 128k x 8 nonvolatile static RAM
• Manufacturer: Maxim

POWER-UP/DOWN CHARACTERISTICS—5V
(V
Figure 8. Power-Up/Down Waveform Timing (5V Device)
CE or WE at V
Power-Down
V
V
V
V
Expected Data-Retention Time
(Oscillator On)
CC
CC
CC
CC
PF
= 5.0V 10%, Over the Operating Range.)
to RST High
Fall Time: V
Fall Time: V
Rise Time: V
PARAMETER
IH
, Before
PF(MAX)
PF(MIN)
PF(MIN)
to V
to V
to V
SO
PF(MAX)
PF(MIN)
SYMBOL
t
t
t
t
REC
t
t
DR
PD
FB
R
F
15 of 18
DS1556 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM
(Notes 6, 7)
CONDITIONS
MIN
300
10
40
10
0
0
TYP
MAX
200
UNITS
years
ms
s
s
s
s