DS1814C datasheet(7/8 Pages) DALLAS

7 / 8 page

DS1814/DS1819

7 of 8

AC ELECTRICAL CHARACTERISTICS

(-40

°C to +85°C; VCC = 1.2V to 5.5V)

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS NOTES

PBRST

= VIL

tPB

Reset Active Time

tRST

140

200

280

Pulse Width

tST

Watchdog Time-out

tTD

1.12

1.60

2.40

VCC Detect to RST and RST

tRPD

VCC Slew Rate (rising edge)

12.5

VCC Detect to RST and RST

tRPU

140

200

280

PBRST

Stable Low to RST and RST

tPDLY

500

CAPACITANCE

A = 25°C)

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS NOTES

Input Capacitance

CIN

5pF

Output Capacitance

COUT

7pF

NOTES:

1) All voltages are referenced to ground.

2) PBRST is internally pulled up to VCC with an internal impedance of 50k

W typical.

3) Measured with VCC

³ 2.7V.

4) Measured with outputs open, VCC

£ 5.5V, and all inputs at VCC or Ground, except the ST input at

<10kHz duty cycle-square wave or ST input open.

5) Measured with outputs open, VCC

£ 3.6V, and all inputs at VCC or Ground, except the ST input at

<10kHz duty cycle-square wave or ST input open.

6) The ST input current is defined as the average input current when ST is driven high or low. This input

must be driven high or low by an output that can source or sink at least 200

mA when active.

7) Noise immunity: pulses <100ns at pushbutton input will not cause a reset.

8) Must not exceed tTD minimum.

9) Noise immunity: pulses <2

ms at VCCTP minimum will not cause a reset and VCCTP - VCC = 100mV.

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