DS12887 데이터 시트보기 (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS12887

Real Time Clock

Dallas Semiconductor -> Maxim Integrated 

POWER-DOWN/POWER-UP TIMING

DS12887

POWER-DOWN/POWER-UP TIMING

PARAMETER

SYMBOL MIN TYP

CS at VIH before Power-Down

VCC Slew from 4.5V to 0V ( CS at VIH)

VCC Slew from 0V to 4.5V ( CS at VIH)

CS at VIH after Power-Up

tP D

0

tF

300

tR

100

tREC

20

PARAMETER

Expected Data Retention

SYMBOL MIN TYP

tDR

10

MAX

200

MAX

UNITS

µs

µs

µs

ms

NOTES

(tA = 25°C)

UNITS NOTES

years

NOTE:

The real time clock will keep time to an accuracy of ±1 minute per month during data retention time for

the period of tDR.

WARNING:

Under no circumstances are negative undershoots, of any amplitude, allowed when device is in battery

backup mode.

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