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DS1678 Real-Time Event Recorder
3 of 25
AC ELECTRICAL CHARACTERISTICS
(VCC= 2.6V to 5.5V or VBAT = 2.6V to 3.5V, TA = -40°C to +85°C.) (Note 1)
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
Input Capacitance
CI
INT
10
pF
Minimum Signal Width
tGLITCH
0.122
0.245
ms
Minimum Event Rate
tEVENT
0.854
1.22
ms
AC ELECTRICAL CHARACTERISTICS
(VCC = 4.5V to 5.5V, TA = -40C to +85C.) (Note 1)
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
Fast mode
100
400
SCL Clock Frequency
fSCL
Standard mode
100
kHz
Fast mode
1.3
Bus Free Time Between a STOP and
START Condition
tBUF
Standard mode
4.7
s
Fast mode
0.6
Hold Time (Repeated) START
Condition (Note 3)
tHD:STA
Standard mode
4.0
s
Fast mode
1.3
LOW Period of SCL
tLOW
Standard mode
4.7
s
Fast mode
0.6
HIGH Period of SCL
tHIGH
Standard mode
4.0
s
Fast mode
0.6
Setup Time for a Repeated START
tSU:STA
Standard mode
4.7
s
Fast mode
0
0.9
Data Hold Time (Note 4)
tHD:DAT
Standard mode
0
s
Fast mode
100
Data Setup Time (Note 5)
tSU:DAT
Standard mode
250
ns
Fast mode
20 + 0.1CB
300
Rise Time of Both SDA and SCL
Signals (Note 6)
tR
Standard mode
20 + 0.1CB
1000
ns
Fast mode
20 + 0.1CB
300
Fall Time of Both SDA and SCL
Signals (Note 6)
tF
Standard mode
20 + 0.1CB
300
ns
Fast mode
0.6
Setup Time for STOP
tSU:STO
Standard mode
4.0
s
Capacitive Load for Each Bus Line
(Note 6)
CB
400
pF
Input Capacitance (SCL, SDA)
CI
5
pF
WARNING: Under no circumstances are negative undershoots of any amplitude allowed
when the device is in write protect.
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