Datasheet

DS1339 I
2
C Serial Real-Time Clock
4 of 20
AC ELECTRICAL CHARACTERISTICS
(V
CC
= MIN to MAX, T
A
= -40°C to +85°C.) (Note 9)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
SCL Clock Frequency f
SCL
Fast mode 100 400
kHz
Standard mode 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 10)
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 11, 12) t
HD:DAT
Fast mode 0 0.9
µs
Standard mode 0
Data Setup Time (Note 13) t
SU:DAT
Fast mode 100
ns
Standard mode 250
Rise Time of Both SDA and SCL
Signals (Note 14)
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 14)
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 14)
C
B
400 pF
I/O Capacitance (SDA, SCL) C
I/O
(Note 9) 10 pF
Oscillator Stop Flag (OSF) Delay t
OSF
(Note 15) 100 ms