CAT824 查看數據表（PDF） - Catalyst Semiconductor => Onsemi

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CAT824

System Supervisory Voltage Reset with Watchdog and Manual Reset

Catalyst Semiconductor => Onsemi 

CAT823, CAT824, CAT825

System Supervisory Voltage Reset with

Watchdog and Manual Reset

FEATURES

„ Automatically restarts microprocessor after

Power failure

„ Monitors pushbutton for external override

„ Accurate under voltage system monitoring

„ Brownout detection system reset for use with

3.0, 3.3, and 5.0 volt systems

„ Pin and function compatible with the

MAX823/24/25 products

„ Operating Range from -40°C to +85°C

„ Available in TSOT-23 5-lead and SC-70 packages

For Ordering Information details, see page 13.

APPLICATIONS

„ Microprocessor and Microcontroller based

systems

„ Intelligent Instruments

„ Control Systems

„ Critical µP Monitors

„ Portable Equipment

DESCRIPTION

The CAT823, CAT824, and CAT825 provide basic

reset and monitoring functions for the electronic

systems. Each device monitors the system voltage

and maintains a reset output until that voltage reaches

the device’s specified trip value and then maintains

the reset output active condition until the device’s

internal timer, after a minimum timer of 140ms; to

allow the systems power supply to stabilize.

The CAT823 and CAT824 also have a watchdog input

which can be used to monitor a system signal and

cause a reset to be issued if the signal fails to change

state prior to a timeout condition.

The CAT823 and CAT825 also provide a manual

reset input which can be used to initiate reset if pulled

low. This input can be directly attached to a push-

button or a processor signal.

PIN CONFIGURATION

PIN FUNCTIONS

TSOT-23 5-Lead

SC-70 5-Lead

RESET 1

5 VCC RESET 1

5 VCC

GND 2 CAT823

GND 2 CAT824

MR 3

4 WDI RESET 3

4 WDI

RESET 1

5 VCC

GND 2 CAT825

RESET 3

4 MR

Pin Name

R¯¯E¯S¯E¯T¯

GND

¯M¯R¯

RESET

WDI

VCC

Function

CMOS Push-Pull Active Low Reset

Output

Ground

Manual Reset input – Pulled high

Internally by a 52kΩ resistor designed

to be driven low by a mechanical

pushbutton, open drain output or CMOS

output.

CMOS Push-Pull Active High Reset

Output

Watchdog Timer Input – Designed to be

driven by a processor output or can be

disabled by tri-stating or leaving open.

Power Supply

© Catalyst Semiconductor, Inc.

1

Characteristics subject to change without notice

Doc. No. MD-3027, Rev. B

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