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STC809: DescriptionUP Supervisor Circuits; File Size103KB，13 Pages; ManufacturerETC1

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STC809 Overview

UP Supervisor Circuits

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Data Sheet

STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345

P Supervisor Circuits

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Features

• Precision supply-voltage monitor

- 4.63V (STC8xxL, STC634xL)

- 4.38V (STC8xxM, STC634xM)

- 3.08V (STC8xxT, STC634xT)

- 2.93V (STC8xxS, STC634xS)

- 2.63V (STC8xxR, STC634xR)

- 2.32V (STC8xxZ, STC634xZ)

- 2.20V (STC8xxY, STC634xY)

• 200ms reset pulse width

• Debounced CMOS-compatible manual-reset input

(811, 812, 823, 825, 6342-6344)

• Reset Output Signal for Watchdog and Power

Abnormal, Manual Reset

• Reset Push-Pull output (STC809,811,823,

824,825,6342,6345)

• Reset Open-Drain output (STC803/6343)

• Voltage monitor for power-fail or low battery warning

• Guaranteed RESET/RESET valid at V

= 1.0V

Introduction

The STCxxx family microprocessor (µP)

supervisory circuits are targeted to improve reliability

and accuracy of power-supply circuitry in µP systems.

These devices reduce the complexity and number of

components required to monitor power-supply and

battery functions.

The main functions are:

1. Asserting reset output during power-up, power-

down and brownout conditions for µP system;

2. Detecting power failure or low-battery conditions

with a 1.25V threshold detector;

3. Watchdog functions;

4. Manual reset.

Applications

• Power-supply circuitry in µP systems

Ordering Information

Part No.

RESET output

Push-Pull

Open-Drain

√

RESET

output

(push-pull)

√

Manual Reset

Input

√

Power Fail

Detector

(1.25V)

√

Watchdog

Input

√

Package

STC803X

STC809X

STC810X

STC811X

STC812X

STC823X

STC824X

STC825X

STC6342X

STC6343X

STC6344X

STC6345X

√

SOT23-3

SOT23-5

SOT23-6

Suffix: X -- Monitored Voltage

Suffix X

Reset threshold (V)

STC

4.63

4.38

3.08

2.93

2.63

2.32

2.20

Ver1.0

Data Sheet

STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345

P Supervisor Circuits

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Contents

Features ....................................................................................................................................................... 1

Ordering Information .................................................................................................................................. 1

Introduction ................................................................................................................................................. 1

Block Diagram ............................................................................................................................................ 3

Marking Information ................................................................................................................................... 4

Pin Information ........................................................................................................................................... 5

Pin Configuration .............................................................................................................................. 5

Pin Description .................................................................................................................................. 6

Functional Description ................................................................................................................................ 7

Reset Output ...................................................................................................................................... 7

Watchdog Timer ................................................................................................................................ 7

Manual Reset ..................................................................................................................................... 7

Power-Fail Comparator ..................................................................................................................... 7

Recommended Operation Condition ................................................................................................. 8

Detailed Specifications ................................................................................................................................ 8

Absolute Maximum Ratings .............................................................................................................. 8

DC Electrical Characteristics ............................................................................................................. 9

AC Electrical Characteristics ........................................................................................................... 10

Mechanical Information ............................................................................................................................ 11

Notes ......................................................................................................................................................... 14

STC

Ver1.0

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