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| DS1631 Datasheet, PDF (5/15 Pages) National Semiconductor (TI) – CMOS Dual Peripheral Drivers | |||
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DS1631/DS1631A/DS1731
AC ELECTRICAL CHARACTERISTICS
(VDD = 2.7V to 5.5V; TA = -55°C to +125°C.)
PARAMETER SYMBOL CONDITION
MIN TYP MAX UNITS NOTES
9-bit resolution
93.75
Temperature
Conversion Time
10-bit
resolution
tTC
11-bit
resolution
187.5
375
ms
12-bit
resolution
750
SCL Frequency
fSCL
Bus Free Time
0
400 kHz
Between a STOP and
tBUF
START Condition
1.3
µs
5
START and Repeated
START Hold Time
from Falling SCL
tHD:STA
0.6
µs
5, 6
Low Period of SCL
High Period of SCL
tLOW
tHIGH
1.3
µs
5
0.6
µs
5
Repeated START
Condition Setup Time
to Rising SCL
tSU:STA
0.6
µs
5
Data-Out Hold Time
from Falling SCL
tHD:DAT
0
0.9
µs
5
Data-In Setup Time to
Rising SCL
tSU:DAT
100
ns
5
Rise Time of SDA and
SCL
tR
20 + 0.1CB
1000 ns
5, 7
Fall Time of SDA and
SCL
tF
20 + 0.1CB
300 ns
5, 7
STOP Setup Time to
Rising SCL
tSU:STO
0.6
µs
5
Capacitive Load for
Each Bus Line
CB
400 pF
I/O Capacitance
CI/O
Input Capacitance
CI
Spike Pulse Width that
10
pF
5
pF
can be Suppressed by
tSP
Input Filter
0
50
ns
NOTES:
1) All voltages are referenced to GND.
2) See Figure 2 for Typical Operating Curves.
3) Specified with TOUT pin open; A0, A1, A2 = 0V or VDD; and fSCL ⥠2Hz.
4) Specified with temperature conversions stopped; TOUT pin open; SDA = VDD; SCL = VDD; and A0, A1,
A2 = 0V or VDD.
5) See Timing Diagram in Figure 3. All timing is referenced to 0.9 x VDD and 0.1 x VDD.
6) After this period the first clock pulse is generated.
7) For example, if CB = 300pF, then tR[min] = tF[min] = 50ns.
5 of 15
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