Rainbow Electronics DS1500 - Manual (Page 8)

DS1500 Y2KC Watchdog RTC with Nonvolatile Control
8 of 19
WAKEUP/KICKSTART TIMING
(T
A
= +25°C) (Figure 6)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Kickstart-Input Pulse Width t
KSPW
2 ms
Wakeup/Kickstart Power-On Timeout t
POTO
(Note 11) 2 s
Note: Time intervals shown above are referenced in Wakeup/Kickstart.
Figure 6. Wakeup/Kickstart Timing Diagram
Note 1: Limits at -40°C are not production tested and are guaranteed by design.
Note 2: Voltage referenced to ground.
Note 3: Outputs are open.
Note 4: The
IRQ, PWR, and RST outputs are open drain.
Note 5: Value for voltage and currents is from the V
CCI
input pin to the V
CCO
pin.
Note 6: If V
PF
is less than V
BAT
and V
BAUX
, the device power is switched from V
CC
to the greater of V
BAT
or V
BAUX
when V
CC
drops below V
PF
. If V
PF
is greater than V
BAT
and V
BAUX
, the device power is switched from V
CC
to the greater of V
BAT
or V
BAUX
when V
CC
drops below the greater
of V
BAT
or V
BAUX
.
Note 7: Value for voltage and currents is from the V
BAT
or V
BAUX
input pin to the V
CCO
pin.
Note 8: I
BAT1
and I
BAT2
are specified with V
CCO
floating and do not include any RAM current.
Note 9: V
BAT
or V
BAUX
current. Using a 32,768Hz crystal connected to X1 and X2.
Note 10: These parameters are sampled with a 5pF load and are not 100% tested.
Note 11: Typical values are at +25°C, nominal (active) supply, unless otherwise noted.
Note 12: If the oscillator is not enabled, the startup time of the oscillator after V
CCI
is applied is added to the wakeup/kickstart timeout.