DS1775R-U 查看數據表（PDF） - Maxim Integrated
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DS1775R-U Datasheet PDF : 15 Pages
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DS1775
Digital Thermometer and Thermostat in SOT23
AC Electrical Characteristics-2 Wire Interface
(VDD = 2.7V to 5.5V, TA = -55°C to +125°C, unless otherwise noted.) (Figure 5)
PARAMETER
SCL Clock Frequency
Bus Free Time Between a
STOP and START Condition
Hold Time (Repeated) START
Condition
Low Period of SCL
High Period of SCL
Setup Time for a
Repeated START
Data Hold Time
Data Setup Time
Rise Time of Both SDA and
SCL Signals
Fall Time of Both SDA and SCL
Signals
Setup Time for STOP
Capacitive Load for Each Bus
Line
SYMBOL
fSCL
tBUF
tHD:STA
tLOW
tHIGH
tSU:STA
tHD:DAT
tSU:DAT
tR
tF
tSU:STO
CB
CONDITIONS
Fast mode
Standard mode
Fast mode
Standard mode
Fast mode (Note 5)
Standard mode (Note 5)
Fast mode
Standard mode
Fast mode
Standard mode
Fast mode
Standard mode
Fast mode (Note 6)
Standard mode (Note 6)
Fast mode (Note 7)
Standard mode (Note 7)
Fast mode (Note 8)
Standard mode (Note 8)
Fast mode (Note 8)
Standard mode (Note 8)
Fast mode
Standard mode
(Note 8)
MIN TYP
1.3
4.7
0.6
4.0
1.3
4.7
0.6
4.0
0.6
4.7
0
0
100
250
20 + 0.1CB
20 + 0.1CB
20 + 0.1CB
20 + 0.1CB
0.6
4.0
MAX
400
100
UNITS
kHz
µs
µs
µs
µs
µs
0.9
µs
0.9
ns
300
ns
1000
300
ns
300
µs
400
pF
Input Capacitance
CI
5
pF
Note 1: All voltages are referenced to ground.
Note 2:
Note 3:
Note 4:
Note 5:
I/O pins of fast mode devices must not obstruct the SDA and SCL lines if VDD is switched off.
IDD specified with O.S. pin open.
IDD specified with VDD at 5.0V and VSDA, VSCL = 5.0V, 0°C to +70°C.
After this period, the first clock pulse is generated.
Note 6: The maximum tHD:DAT has only to be met if the device does not stretch the low period (tLOW) of the SCL signal.
Note 7: A fast mode device can be used in a standard mode system, but the requirement tSU:DAT ≥ 250ns must then be met. This is
automatically the case if the device does not stretch the low period of the SCL signal. If such a device does stretch the low
period of the SCL signal, it must output the next data bit to the SDA line tR MAX + tSU:DAT = 1000 + 250 = 1250ns before the
SCL line is released.
Note 8: CB = Total capacitance of one bus line in pF.
Note 9: Internal heating caused by O.S. loading causes the DS1775 to read approximately 0.5°C higher if O.S. is sinking the max
rated current.
Note 10: Contact the factory for operation requiring temperature readings greater than +120°C.
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