DS1831CS datasheet(13/14 Pages) DALLAS

13 / 14 page

DS1831C/D/E

13 of 14

CAPACITANCE

(tA = 25

°C)

PARAMETER

SYMBOL

MAX

UNITS

NOTES

Input Capacitance

CIN

5pF

Input Capacitance

COUT

7pF

AC ELECTRICAL CHARACTERISTICS

(-40

° to 85°C, VCC = 1.0V TO 5.5V)

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

RESET Active Time (TD=Low)

tRST

RESET Active Time (TD=Float)

tRST

100

160

200

RESET Active Time (TD=High)

tRST

1000

1600

2000

VCC Detect to RST

tRPU

See RESET Active Time

VCC Detect to RST

tRPD

210

µs

VIN Detect to NMI

tIPD

210

µs

NMI Active Time

tNMI

µs

PBRST

= VIL

tPB

µs

PBRST

Stable Low to Reset

Active

tPDLY

µs

Watchdog Timeout (TD(WD)=Low)

tTD

Watchdog Timeout (TDWD=Float)

tTD

100

160

200

Watchdog Timeout (TDWD=High)

tTD

1000

1600

2000

ST Pulse Width

tST

Vin Slew Rate (V INTP(MAX) to V

INTP(MIN))

300

µs

Vin Slew Rate (V INTP(MAX) to V

INTP(MIN))

0ns

NOTES:

1. All voltages are referenced to ground.

2. Measured with both IN3.3V & IN2.5V

≥ 2.7V.

3. Measured with both IN3.3V & IN2.5V

≤ 2.7V.

4. All Pushbutton inputs are internally pulled to the associated Supply IN input or the greatest Supply IN

input for the MPBRST with an internal Impedance of 100 k

Ω.

5. All outputs are Open Drain and output IOH would be determined by the external pull-up resistor.

6. Measured with outputs open and IN3.3V or IN2.5V

≤ 5.5V.

7. Measured with outputs open and IN3.3V or IN2.5V

≤ 3.6V.

8. Measured using tR = 5 µs.

9. Noise immunity - pulses <2 µs at a trip level will not cause a RST or NMI .

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