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DS1631 Datasheet, PDF (12/19 Pages) National Semiconductor (TI) – CMOS Dual Peripheral Drivers
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POWER-DOWN/POWER-UP TIMING
PARAMETER
CE at VIH before Power-Down
VCC Slew from VPF(MAX) to
VPF(MIN)( CE at VIH)
VCC Slew from VPF(MAX) to
VPF(MIN)( CE at VIH)
CE at VIH after Power-Up
SYMBOL
tPD
tF
tR
tREC
MIN
0
300
0
1.5
PARAMETER
Expected Data Retention Time
SYMBOL
tDR
MIN
10
DS1244/DS1244P
Over the operating range (3.3V)
TYP
MAX UNITS NOTES
ms
ms
ms
2.5
ms
TYP
MAX
(TA = +25°C)
UNITS NOTES
years
9
Warning: Under no circumstances are negative undershoots, of any amplitude, allowed when device is
in battery-backup mode.
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