MAX825YEXK データシートの表示（PDF） - Maxim Integrated

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MAX825YEXK

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

Maxim Integrated 

19-0487; Rev 5; 12/05

5-Pin Microprocessor Supervisory Circuits With

Watchdog Timer and Manual Reset

________________General Description

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 relia-

bility and accuracy compared to separate ICs or discrete

components. The MAX823/MAX824/MAX825 are specifi-

cally designed to ignore fast transients on VCC.

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 VCC down to 1V. The MAX823

also offers a watchdog input and manual reset input.

The MAX824 offers a watchdog input and a comple-

mentary 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.

*Pg

________________________Applications

Computers and Controllers

Embedded Controllers

Intelligent Instruments

Automotive Systems

Critical µP Monitoring

Portable/Battery-Powered Equipment

Reset Threshold Table

SUFFIX

L

M

T

S

R

Z (SC70 only)

Y (SC70 only)

RESET

THRESHOLD (V)

4.63

4.38

3.08

2.93

2.63

2.32

2.19

Features

♦ 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 Valid to VCC = 1V

♦ Power-Supply Transient Immunity

♦ Watchdog Timer with 1.6s Timeout

(MAX823/MAX824)

♦ Manual Reset Input (MAX823/MAX825)

♦ No External Components

Ordering Information

PART†

TEMP. RANGE PIN-PACKAGE

MAX823_EXK-T -40°C to +85°C

5 SC70-5

MAX823_EUK-T -40°C to +125°C 5 SOT23-5

MAX824_EXK-T -40°C to +85°C

5 SC70-5

†Insert the desired suffix letter (from the Reset Threshold table) into

the blank to complete the part number. All devices are available in

tape-and-reel only. There is a 2500 piece minimum order increment.

Devices are available in both leaded and lead-free packaging.

Specify lead-free by replacing “-T” with “+T” when ordering.

Ordering Information continued at end of data sheet.

______________________Selector Guide

FUNCTION

MAX823 MAX824 MAX825

Active-Low Reset

✔

✔

✔

Active-High Reset

—

✔

✔

Watchdog Input

✔

✔

—

Manual Reset Input

✔

—

✔

Typical Operating Circuit appears at end of data sheet.

Marking Information appears at end of data sheet.

Pin Configurations

TOP VIEW

RESET 1

5 VCC

RESET 1

5 VCC

RESET 1

5 VCC

MAX823

GND 2

MAX824

GND 2

MAX825

GND 2

MR 3

4 WDI

RESET 3

4 WDI

RESET 3

4 MR

SOT23/SC70

SOT23/SC70

SOT23/SC70

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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