IDT1339
REAL-TIME CLOCK WITH SERIAL I2C INTERFACE
RTC
AC Electrical Characteristics
Unless stated otherwise, VCC = MIN to MAX, Ambient Temperature -40 to +85° C, Note 13
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
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: Under no circumstances are negative undershoots, of any amplitude, allowed when device is in
battery-backup mode.
Note 1: Limits at -40°C are guaranteed by design and are not production tested.
Note 2: SCL only.
Note 3: SDA and SQW/INT.
Note 4: ICCA—SCL at fSC max, VIL = 0.0V, VIH = VCC, trickle charger disabled.
Note 5: Specified with the I2C bus inactive, VIL = 0.0V, VIH = VCC, trickle charger disabled.
Note 6: VCC must be less than 3.63 V if the 250Ω resistor is selected.
IDT® REAL-TIME CLOCK WITH SERIAL I2C INTERFACE
17
IDT1339
REV K 032910
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
