IDT1338B-31
REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM
RTC
AC Electrical Characteristics
(V = V
to V
, TA = -40°C to +85°C) (Note 1)
CC(MAX)
CC
CC(MIN)
Parameter
Symbol
Conditions
Min.
100
Typ. Max. Units
SCL Clock Frequency
f
Fast Mode
400
100
kHz
µs
µs
µs
µs
µs
µs
ns
ns
ns
µs
pF
SCL
Standard Mode
Fast Mode
0
Bus Free Time Between a STOP and
START Condition
t
1.3
BUF
Standard Mode
Fast Mode
4.7
Hold Time (Repeated) START
Condition, Note 8
t
0.6
HD:STA
Standard Mode
Fast Mode
4.0
Low Period of SCL Clock
t
1.3
LOW
Standard Mode
Fast Mode
4.7
High Period of SCL Clock
t
0.6
HIGH
Standard Mode
Fast Mode
4.0
Setup Time for a Repeated START
Condition
t
0.6
SU:STA
Standard Mode
Fast Mode
4.7
Data Hold Time (Notes 9, 10)
t
0
0.9
HD:DAT
Standard Mode
Fast Mode
0
Data Setup Time (Note 11)
t
100
SU:DAT
Standard Mode
Fast Mode
250
Rise Time of Both SDA and SCL
Signals (Note 12)
t
20 + 0.1C
20 + 0.1C
20 + 0.1C
20 + 0.1C
0.6
300
1000
300
R
B
B
B
B
Standard Mode
Fast Mode
Fall Time of Both SDA and SCL Signals
(Note 12)
t
F
Standard Mode
Fast Mode
300
Setup Time for STOP Condition
t
SU:STO
Standard Mode
4.0
Capacitive Load for Each Bus Line
(Note 12)
C
400
10
B
I/O Capacitance (SDA, SCL)
C
Note 13
Note 14
pF
I/O
Oscillator Stop Flag (OSF) Delay
t
100
ms
OSF
WARNING: Negative undershoots below 0.3 V while the device is in battery-backed mode may cause loss
of data.
Note 1: Limits at -40°C are guaranteed by design and are not production tested.
Note 2: All voltages referenced to ground.
Note 3: SCL only.
Note 4: SDA and SQW/OUT.
Note 5: I
—SCL clocking at max frequency = 400 kHz.
CCA
2
Note 6: Specified with the I C bus inactive.
IDT™ REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM 13
IDT1338B-31 REV A 112309
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
