IDT1338
REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM RTC
IDT®
REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM 13
IDT1338 REV S 111214
AC Electrical Characteristics
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, TA = -40°C to +85°C) (Note 1)
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
CCA
—SCL clocking at max frequency = 400 kHz.
Note 6: Specified with the I
2
C bus inactive.
Parameter Symbol Conditions Min. Typ. Max. Units
SCL Clock Frequency f
SCL
Fast Mode 100 400 kHz
Standard Mode 0 100
Bus Free Time Between a STOP and
START Condition
t
BUF
Fast Mode 1.3 µs
Standard Mode 4.7
Hold Time (Repeated) START
Condition, Note 8
t
HD:STA
Fast Mode 0.6 µs
Standard Mode 4.0
Low Period of SCL Clock t
LOW
Fast Mode 1.3 µs
Standard Mode 4.7
High Period of SCL Clock t
HIGH
Fast Mode 0.6 µs
Standard Mode 4.0
Setup Time for a Repeated START
Condition
t
SU:STA
Fast Mode 0.6 µs
Standard Mode 4.7
Data Hold Time (Notes 9, 10) t
HD:DAT
Fast Mode 0 0.9 µs
Standard Mode 0
Data Setup Time (Note 11) t
SU:DAT
Fast Mode 100 ns
Standard Mode 250
Rise Time of Both SDA and SCL
Signals (Note 12)
t
R
Fast Mode 20 + 0.1C
B
300 ns
Standard Mode 20 + 0.1C
B
1000
Fall Time of Both SDA and SCL Signals
(Note 12)
t
F
Fast Mode 20 + 0.1C
B
300 ns
Standard Mode 20 + 0.1C
B
300
Setup Time for STOP Condition t
SU:STO
Fast Mode 0.6 µs
Standard Mode 4.0
Capacitive Load for Each Bus Line
(Note 12)
C
B
400 pF
I/O Capacitance (SDA, SCL) C
I/O
Note 13 10 pF
Oscillator Stop Flag (OSF) Delay t
OSF
Note 14 100 ms
