MAX825YEXK 查看數據表（PDF） - Maxim Integrated

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MAX825YEXK

5-Pin Microprocessor Supervisory Circuits With Watchdog Timer and Manual Reset

Maxim Integrated 

5-Pin Microprocessor Supervisory Circuits With

Watchdog Timer and Manual Reset

PIN

MAX823 MAX824 MAX825

1

1

1

2

2

2

3

—

4

—

3

3

4

4

—

5

5

5

NAME

RESET

GND

MR

RESET

WDI

VCC

Pin Description

FUNCTION

Active-Low Reset Output. Pulses low for 200ms when triggered, and remains

low whenever VCC is below the reset threshold or when MR is a logic low. It

remains low for 200ms after one of the following occurs: VCC rises above the

reset threshold, the watchdog triggers a reset, or MR goes low to high.

Ground

Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as

long as MR is held low and for 200ms after MR returns high. The active-low input

has an internal 52kΩ pullup resistor. It can be driven from a CMOS logic line or

shorted to ground with a switch. Leave open or connect to VCC if unused.

Active-High Reset Output. Inverse of RESET.

Watchdog Input. If WDI remains either high or low for longer than the watch-

dog timeout period, the internal watchdog timer runs out and a reset is trig-

gered. The internal watchdog timer clears whenever reset is asserted, or

whenever WDI sees a rising or falling edge. If WDI is left unconnected or is

connected to a three-stated buffer output, the watchdog feature is disabled.

Supply Voltage

VCC

VCC

MAX823

MAX824

MAX825

1.25V

RESET

GENERATOR

RESET

RESET

(MAX824/MAX825

ONLY)

MR

(MAX823/MAX825

ONLY)

WDI

(MAX823/MAX824

ONLY)

WATCHDOG

TRANSITION

DETECTOR

WATCHDOG

TIMER

GND

Figure 1. Functional Diagram

6 _______________________________________________________________________________________

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