BQ3287 Datasheet, PDF (3/8 Pages) Texas Instruments – Real-Time Clock RTC Module

bq3287/bq3287A
Power-Down/Power-Up Timing (TA = TOPR)
Symbol
Parameter
Minimum
tF
VCC slew from 4.5V to 0V
300
tR
VCC slew from 0V to 4.5V
100
Typical
-
-
tCSR
CS at VIH after power-up
20
-
t_DR
Data-retention and time-
keeping time
10
-
Maximum
-
-
200
Unit
µs
µs
ms
Conditions
Internal write-protection
period after VCC passes VPFD
on power-up.
-
years T_A = 25°C.
Note:
Clock accuracy is better than ± 1 minute per month at 25°C for the period of tDR.
Caution: Negative undershoots below the absolute maximum rating of -0.3V in battery-backup mode
may affect data integrity.
Power-Down/Power-Up Timing
Sept. 1996 D
3