DS1631Z datasheet(4/14 Pages) DALLAS

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DS1631/DS1631A/DS1731

4 of 14

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

10-bit

resolution

187.5

11-bit

resolution

375

Temperature

Conversion Time

tTC

12-bit

resolution

750

SCL Frequency

fSCL

400

kHz

Bus Free Time

Between a STOP and

START Condition

tBUF

1.3

µs

START and Repeated

START Hold Time

from Falling SCL

tHD:STA

0.6

µs

5, 6

Low Period of SCL

tLOW

1.3

µs

High Period of SCL

tHIGH

0.6

µs

Repeated START

Condition Setup Time

to Rising SCL

tSU:STA

0.6

µs

Data-Out Hold Time

from Falling SCL

tHD:DAT

0.9

µs

Data-In Setup Time to

Rising SCL

tSU:DAT

100

Rise Time of SDA and

SCL

20 + 0.1CB

1000

5, 7

Fall Time of SDA and

SCL

20 + 0.1CB

300

5, 7

STOP Setup Time to

Rising SCL

tSU:STO

0.6

µs

Capacitive Load for

Each Bus Line

400

I/O Capacitance

CI/O

Input Capacitance

5pF

Spike Pulse Width that

can be Suppressed by

Input Filter

tSP

050

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

³ 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.

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