VT82885 データシートの表示（PDF） - Unspecified

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VT82885

Real Time Clock

Unspecified 

VIA Technologies, Inc.

VCC

4.5V

VBAT

CS#

tF

tPD

CURRENT SUPPLIED

FROM EXTERNAL

LITHIUM ENERGY CELL

DATA RETENTION

tDR

VT82885

Real Time Clock

tR

tREC

POWER DOWN/POWER UP TIMING

PARAMETER

SYMBOL MIN

CS# at VIH before Power-Down tPD

0

VCC slew from 4.5V to 0V

(CS# at VIH)

tF

300

VCC slew from 0V to 4.5V

(CS# at VIH)

tR

100

CS# at VIH after Power-Up

tREC

20

TYP

MAX

UNITS

µs

µs

NOTES

µs

200

ms

(tA = 25°C)

PARAMETER

Expected Data Retention

SYMBOL MIN

tDR

10

TYP

MAX

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

undershots, of any amplitude, allowed when

device is in battery backup mode.

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