BQ3285EC Datasheet, PDF (22/26 Pages) Texas Instruments – Real-Time Clock (RTC)

bq3285EC/LC
Power-Down/Power-Up Timing—bq3285LC (T_A = T_OPR)
Symbol
Parameter
Minimum Typical Maximum Unit
Conditions
tF
VCC slew from 2.7V to 0V
300
-
tR
VCC slew from 0V to 2.7V
100
-
-
µs
-
µs
tCSR
CS at VIH after power-up
20
-
Internal write-protection
200
ms period after VCC passes VPFD
on power-up.
Caution: Negative undershoots below the absolute maximum rating of -0.3V in battery-backup mode
may affect data integrity.
Power-Down/Power-Up Timing—bq3285LC
July 1996
22