DS1672 Datasheet, PDF (9/13 Pages) Dallas Semiconductor – Low Voltage Serial Timekeeping Chip

AC ELECTRICAL CHARACTERISTICS
PARAMETER SYMBOL CONDITION MIN
SCL Clock
Frequency
f_SCL
Fast Mode
100
Standard Mode
DS1672
(-40°C to +85°C; V_CC > V_PF)
TYP MAX UNITS NOTES
400 kHz
100
Bus Free Time
t_BUF
Fast Mode
1.3
µs
Between a STOP
and START
Standard Mode 4.7
Condition
Hold Time
t_HD:STA
Fast Mode
0.6
(Repeated) START
Condition
Standard Mode 4.0
µs
2
LOW Period of
t_LOW
Fast Mode
1.3
µs
SCL Clock
Standard Mode 4.7
HIGH Period of
t_HIGH
Fast Mode
0.6
µs
SCL Clock
Standard Mode 4.0
Set-up Time for a
t_SU:STA
Fast Mode
0.6
µs
Repeated START
Condition
Standard Mode 4.7
Data Hold Time
t_HD:DAT
Fast Mode
0
Standard Mode
0
0.9
µs
3, 4
Data Set-up Time
t_SU:DAT
Fast Mode
100
Standard Mode 250
µs
11
Rise Time of Both
SDA and SCL
Signals
t_R
Fast Mode 20 + 0.1C_B
Standard Mode
300
ns
5
1000
Fall Time of Both
SDA and SCL
Signals
t_F
Fast Mode 20 + 0.1C_B
Standard Mode
300
ns
5
300
Set-up Time for
t_SU:STO
Fast Mode
0.6
µs
STOP Condition
Standard Mode 4.0
Capacitive Load for
C_B
each Bus Line
400 pF
5
I/O Capacitance
C_I/O
10
pF
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