DS1814B 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS1814B

5V and 3.3V MicroMonitor

Dallas Semiconductor -> Maxim Integrated 

AC ELECTRICAL CHARACTERISTICS

PARAMETER

SYMBOL

PBRST = VIL

tPB

Reset Active Time

tRST

ST Pulse Width

tST

Watchdog Time-out

tTD

VCC Detect to RST and RST

tRPD

VCC Slew Rate (rising edge)

VCC Detect to RST and RST

tRPU

PBRST Stable Low to RST and RST

tPDLY

DS1814/DS1819

(-40°C to +85°C; VCC = 1.2V to 5.5V)

MIN TYP MAX UNITS NOTES

1

ms

7

140 200

280

ms

50

ns

8

1.12 1.60 2.40

s

30

40

ms

9

12.5

V/ms

140 200

280

ms

500

ns

CAPACITANCE

PARAMETER

Input Capacitance

Output Capacitance

SYMBOL

CIN

COUT

MIN

(tA = 25°C)

TYP MAX UNITS NOTES

5

pF

7

pF

NOTES:

1) All voltages are referenced to ground.

2) PBRST is internally pulled up to VCC with an internal impedance of 50kW 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 200mA 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 <2ms at VCCTP minimum will not cause a reset and VCCTP - VCC = 100mV.

7 of 8

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