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| DS1286 Datasheet, PDF (13/18 Pages) Dallas Semiconductor – Watchdog Timekeeper | |||
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POWER-UP/POWER-DOWN CONDITION
PARAMETER
SYMBOL
CE at VIH before Power-Down
tPD
VCC Slew from 4.5V to 0V (CE at VIH)
tF
VCC Slew from 0V to 4.5V (CE at VIH)
tR
CE at VIH after Power-Up
tREC
MIN
0
350
100
POWER-DOWN/POWER-UP CONDITION
TYP
DS1284/DS1286
MAX
150
UNITS
ïs
ïs
ïs
ns
NOTES
(TA = +25°C)
PARAMETER
Expected Data-Retention Time
(DS1286)
SYMBOL MIN
tDR
10
TYP
MAX UNITS NOTES
years
9
WARNING: Under no circumstances are negative undershoots, of any amplitude, allowed
when device is in battery-backup mode.
13 of 18
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