IDT1339
REAL-TIME CLOCK WITH SERIAL I
2
C INTERFACE
RTC
Table 1. Power Control
Supply Condition
V
CC
< V
PF
, V
CC
<
V
BACKUP
V
CC
< V
PF
, V
CC
>
V
BACKUP
V
CC
> V
PF
, V
CC
<
V
BACKUP
V
CC
> V
PF
, V
CC
>
V
BACKUP
Read/Write
Access
No
No
Yes
Yes
Powered
By
V
BACKUP
V
CC
V
CC
V
CC
Power-up/down Timing
Table 2. Power-up/down Characteristics
Ambient Temperature -40 to +85° C
Parameter
Recovery at Power-up
V
CC
Fall Time; V
PF(MAX)
to V
PF(MIN)
V
CC
Rise Time; V
PF(MIN)
to V
PF(MAX)
Symbol
t
REC
t
VCCF
t
VCCR
Conditions
(see note below)
Min.
300
0
Typ.
Max.
2
Units
ms
µs
µs
Note:
This delay applies only if the oscillator is running. If the oscillator is disabled or stopped, no power-up delay
occurs.
IDT®
REAL-TIME CLOCK WITH SERIAL I
2
C INTERFACE
5
IDT1339
REV K 032910