DS1307 64 x 8, Serial, I2C Real-Time Clock 3 of 14 AC ELECTRICAL CHARACTERISTICS" />
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鍨嬭櫉锛� DS1307ZN+T&R
寤犲晢锛� Maxim Integrated Products
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DS1307 64 x 8, Serial, I2C Real-Time Clock
3 of 14
AC ELECTRICAL CHARACTERISTICS
(VCC = 4.5V to 5.5V; TA = 0掳C to +70掳C, TA = -40掳C to +85掳C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SCL Clock Frequency
fSCL
0
100
kHz
Bus Free Time Between a STOP and
START Condition
tBUF
4.7
s
Hold Time (Repeated) START
Condition
tHD:STA
(Note 4)
4.0
s
LOW Period of SCL Clock
tLOW
4.7
s
HIGH Period of SCL Clock
tHIGH
4.0
s
Setup Time for a Repeated START
Condition
tSU:STA
4.7
s
Data Hold Time
tHD:DAT
0
s
Data Setup Time
tSU:DAT
(Notes 5, 6)
250
ns
Rise Time of Both SDA and SCL
Signals
tR
1000
ns
Fall Time of Both SDA and SCL
Signals
tF
300
ns
Setup Time for STOP Condition
tSU:STO
4.7
s
CAPACITANCE
(TA = +25掳C)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Pin Capacitance (SDA, SCL)
CI/O
10
pF
Capacitance Load for Each Bus
Line
CB
(Note 7)
400
pF
Note 1:
All voltages are referenced to ground.
Note 2:
Limits at -40掳C are guaranteed by design and are not production tested.
Note 3:
ICCS specified with VCC = 5.0V and SDA, SCL = 5.0V.
Note 4:
After this period, the first clock pulse is generated.
Note 5:
A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the VIH(MIN) of the SCL
signal) to bridge the undefined region of the falling edge of SCL.
Note 6:
The maximum tHD:DAT only has to be met if the device does not stretch the LOW period (tLOW) of the SCL signal.
Note 7:
CB鈥攖otal capacitance of one bus line in pF.
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