DS1236
power-down in a sleep mode. Removal of the sleep mode by the
PBRST
input is not affected by the IN
pin threshold at V
TP
when the RC pin is tied high (CMOS mode). Subsequent power-up of the V
CC
supply
with the RC pin tied high will activate the RST and
RST
outputs as the main supply rises above V
BAT
. A
high-to-low transition on the WC/
SC
pin must follow a high-to-low transition on the ST pin by t
WC
to
invoke a Sleep mode for the DS1236.
FRESHNESS SEAL
Figure 8
NOTE: This series of pulses must be applied during normal +5 volt operation.
POWER SWITCHING
Figure 9
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