bq3285ED/LD
Power-Down/Power-Up Timing—bq3285ED (TA = TOPR
)
Symbol
Parameter
Minimum
300
Typical
Maximum
Unit
Conditions
tF
VCC slew from 4.5V to 0V
VCC slew from 0V to 4.5V
-
-
-
-
µs
µs
tR
100
Internal write-protection
tCSR
CS at VIH after power-up
20
-
200
ms
period after VCC passes VPFD
on power-up.
Ca u tion : Nega tive u n d er sh oots below th e a bsolu te m a xim u m r a tin g of -0.3V in ba tter y-ba ck u p m od e
m a y a ffect d a ta in tegr ity.
Power-Down/Power-Up Timing—bq3285ED
tF
tR
4.5
VPFD
4.5
VPFD
VCC
VSO
VSO
tCSR
CS
T3285L08.eps
July 1997
21
TI [ TEXAS INSTRUMENTS ]
