IDT1338
REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM
RTC
AC Electrical Characteristics
(VCC = VCC(MIN) to VCC(MAX), TA = -40°C to +85°C) (Note 1)
Parameter
SCL Clock Frequency
Symbol
Conditions
Fast Mode
Min.
Typ. Max. Units
fSCL
100
400
100
kHz
µs
µs
µs
µs
µs
µs
ns
ns
ns
µs
pF
Standard Mode
Fast Mode
0
Bus Free Time Between a STOP and
START Condition
tBUF
1.3
Standard Mode
4.7
Hold Time (Repeated) START
Condition, Note 8
tHD:STA Fast Mode
Standard Mode
Fast Mode
0.6
4.0
Low Period of SCL Clock
tLOW
1.3
Standard Mode
Fast Mode
4.7
High Period of SCL Clock
tHIGH
0.6
Standard Mode
Fast Mode
4.0
Setup Time for a Repeated START
Condition
tSU:STA
0.6
Standard Mode
4.7
0
Data Hold Time (Notes 9, 10)
tHD:DAT Fast Mode
Standard Mode
Fast Mode
0.9
0
Data Setup Time (Note 11)
tSU:DAT
100
Standard Mode
Fast Mode
250
Rise Time of Both SDA and SCL
Signals (Note 12)
tR
20 + 0.1CB
20 + 0.1CB
20 + 0.1CB
20 + 0.1CB
0.6
300
1000
300
Standard Mode
Fast Mode
Fall Time of Both SDA and SCL Signals
(Note 12)
tF
Standard Mode
300
Setup Time for STOP Condition
tSU:STO Fast Mode
Standard Mode
4.0
Capacitive Load for Each Bus Line
(Note 12)
CB
400
10
I/O Capacitance (SDA, SCL)
CI/O
tOSF
Note 13
Note 14
pF
Oscillator Stop Flag (OSF) Delay
100
ms
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: ICCA—SCL clocking at max frequency = 400 kHz.
Note 6: Specified with the I2C bus inactive.
IDT® REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM 13
IDT1338
REV K 032910
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
