DS1557 Maxim, DS1557 Datasheet - Page 15

• Manufacturer Part Number: DS1557
• Description: The DS1557 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 512k x 8 nonvolatile static RAM
• Manufacturer: Maxim

POWER-UP/DOWN CHARACTERISTICS—3.3V
(V
Figure 9. Power-Up/Down Waveform Timing—3.3V Device
CAPACITANCE
(T
CE or WE at V
Power-Down
V
V
V
Expected Data-Retention Time
(Oscillator On)
Capacitance on All Input Pins
Capacitance on IRQ/FT, RST,
and DQ Pins
A
CC
CC
CC
PF
= +25°C)
= 3.3V ±10%, T
to RST High
Fall Time: V
Rise Time: V
PARAMETER
PARAMETER
IH
, Before
PF(MAX)
PF(MIN)
A
= Over the Operating Range.)
to V
to V
PF(MAX)
PF(MIN)
SYMBOL
C
C
SYMBOL
IN
IO
t
t
t
REC
t
t
PD
DR
R
F
(Note 1)
(Note 1)
(Note 6)
15 of 17
CONDITIONS
CONDITIONS
MIN
300
MIN
40
10
0
0
TYP
TYP
MAX
MAX
14
10
200
UNITS
UNITS
years
pF
pF
ms
s
s
s