BQ3285 Datasheet, PDF (17/22 Pages) Texas Instruments – Real-Time Clock RTC

bq3285
Power-Down/Power-Up Timing (T_A = T_OPR)
Symbol
Parameter
Minimum Typical
tF
VCC slew from 4.5V to 0V
300
-
tR
VCC slew from 0V to 4.5V
100
-
tCSR
CS at VIH after power-up
20
-
Maximum
-
-
200
Unit
µs
µs
ms
Conditions
Internal write-protection
period after VCC passes VPFD
on power-up.
Power-Down/Power-Up Timing
Jan. 1999 E
17