IMP1233DZ-5/S 查看數據表（PDF） - A1 PROs co., Ltd.

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IMP1233DZ-5/S

Low Power, 5V µP Reset – Active LOW, Open-Drain Output – 350ms Reset Period

A1 PROs co., Ltd. 

IMP1812

POWER MANAGEMENT

Low Power, 5V µP Reset

– Active HIGH, Push-Pull Output

The IMP1812 supply voltage monitor is an improved, low-power

replacement for the Dallas Semiconductor DS1812. Maximum supply

current over temperature is a low 20µA, representing over 50 percent

lower power as compared to the DS1812.

The IMP1812 issues an active HIGH reset signal whenever the moni-

tored supply is out-of-tolerance. A precision reference and comparator

circuit monitor power supply (VCC) level. Tolerance level options are 5-,

10- and 15-percent. When an out-of-tolerance condition is detected, an

internal power-fail signal is generated which forces an active HIGH reset

signal. After VCC returns to an in-tolerance condition, the reset signal

remains active for 150ms to allow the power supply and system micro-

processor to stabilize.

The IMP1812 is designed with a push-pull output stage and operates

over the extended industrial temperature range. Devices are available in

compact surface mount SOT-23 packages and 3-lead TO-92 packages.

Other low power products in this family include the IMP1810/11/15/16/17,

IMP1233D and IMP1233M.

Key Features

x Improved Dallas DS1812 replacement

— Over 50% lower maximum supply current

x Low Supply Current

— 20µA maximum (5.5V)

x Automatically restarts a microprocessor after

power failure

x 150ms reset delay after VCC returns to an

in-tolerance condition

x Active HIGH power-up reset

x Precision temperature-compensated voltage

reference and comparator

x Eliminates external components

x Low-cost TO-92 package

x Compact surface mount SOT-23 package

x Push-Pull output for minimum current drain

x Operating temperature – 40°C to +85°C

Family Selection Guide

Part

IMP1810

IMP1811

IMP1812

IMP1815

IMP1816

IMP1817

IMP1233D

IMP1233M

RESET Voltage

(V)

4.620, 4.370, 4.120

4.620, 4.350, 4.130

4.620, 4.350, 4.130

3.060, 2.880, 2.550

3.060, 2.880, 2.550

3.060, 2.880, 2.550

4.625, 4.375, 4.125

4.625, 4.375, 2.720

RESET Time

(ms)

150

150

150

150

150

150

350

350

Output

Stage

Push-Pull

Open-Drain

Push-Pull

Push-Pull

Open-Drain

Push-Pull

Open-Drain

Open-Drain

RESET

Polarity

LOW

LOW

HIGH

LOW

LOW

HIGH

LOW

LOW

Applications

x Set-top boxes

x Cellular phones

x PDAs

x Energy management systems

x Embedded control systems

x Printers

x Single board computers

Block Diagram

VCC

1

Supply

Tolerance

Bias

+

–

Reference

© 1999 IMP, Inc.

IMP1812

Delay

150ms

Typical

3

GND

2 RESET

VCC

IMP1812

RESET

GND

1812_01.eps

408-432-9100/www.impweb.com

Typical Application

Microprocessor

RESET

1812_02.eps

1

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