MAX823TEUK

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概述

The MAX823/MAX824/MAX825* microprocessor (µP) supervisory circuits combine reset output, watchdog, and manual reset input functions in 5-pin SOT23 and SC70 packages. They significantly improve system reliability and accuracy compared to separate ICs or discrete components. The MAX823/MAX824/MAX825 are specifically designed to ignore fast transients on V_CC.

Seven preprogrammed reset threshold voltages are available (see Reset Threshold Table). All three devices have an active-low reset output, which is guaranteed to be in the correct state for V_CC down to 1V. The MAX823 also offers a watchdog input and manual reset input. The MAX824 offers a watchdog input and a complementary active-high reset. The MAX825 offers a manual reset input and a complementary active-high reset. The Selector Guide explains the functions offered in this series of parts.

关键特性 应用

Precision Monitoring of +2.5V, +3V, +3.3V, and +5V Power Supplies
Operating Current: 6µA (MAX823L/M) (SC70)
2µA (MAX825T/S/R/Z/Y) (SC70)

Fully Specified Over Temperature
140ms min Power-On Reset
Guaranteed RESET-bar Valid to V_CC = 1V
Power-Supply Transient Immunity
Watchdog Timer with 1.6s Timeout (MAX823/MAX824)
Manual Reset Input (MAX823/MAX825)
No External Components

汽车电子

计算机与控制器

精确的µP监视器

嵌入式控制器

智能仪表

便携式电池供电设备

Key Specifications: Microprocessor Supervisors

Part Number

Number of Monitored Voltages

Reset Threshold Range (V)

Active-Low Reset Output

Active-High Reset Output

Min. Reset Timeout Range

Watchdog Feature

Nom. Watchdog Timeout Range

Supervisor Features

Max. I_CC (µA)

Industry Qualified

Package Type

Operating Temp. Range (°C)

MAX823

1.8 to 2.5 2.5 to 3.3 3.3 to 5.5

Push-Pull

85ms to 300ms

Input (WDI)

1s to 2s

Manual Reset

24.0

Automotive - General

SC70 SOT

0 to +70 -40 to +125 -40 to +85

MAX824

Push-Pull

Input (WDI)

1s to 2s

24.0

MAX825

Push-Pull

No Watchdog

Manual Reset

12.0

应用笔记

App Note 279: Supervisory Circuits Keep Your Microprocessor Under Control - MAX823 (English only)

App Note 1050: Reset Circuit Ensures Valid Supply Voltage - MAX824 (English only)

App Note 1926: Watchdogs Improve System Reliability—How to Choose the Right Part - MAX823, MAX824, MAX825 (English only)

注释

*Patents Pending

Active-low reset with manual reset and watchdog timer (MAX823)

Active-low reset and active-high reset with watchdog timer (MAX824)

Active-low reset and active-high reset with manual reset (MAX825)

图表

MAX823, MAX823L, MAX823M, MAX823R, MAX823S, MAX823T, MAX823Y, MAX823Z, MAX824, MAX824L, MAX824M, MAX824R, MAX824S, MAX824T, MAX824Y, MAX824Z, MAX825, MAX825L, MAX825M, MAX825R, MAX825S, MAX825T, MAX825Y, MAX825Z: Typical Operating Circuit

Typical Operating Circuit