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NCP305

Voltage Detector Series

ON Semiconductor 

NCP304, NCP305

Voltage Detector Series

The NCP304 and NCP305 series are second generation ultra−low

current voltage detectors. These devices are specifically designed for

use as reset controllers in portable microprocessor based systems

where extended battery life is paramount.

Each series features a highly accurate undervoltage detector with

hysteresis which prevents erratic system reset operation as the

comparator threshold is crossed.

The NCP304 series consists of complementary output devices that

are available with either an active high or active low reset output. The

NCP305 series has an open drain N−Channel output with an active low

reset output.

The NCP304 and NCP305 device series are available in the

SC−82AB package with standard undervoltage thresholds. Additional

thresholds that range from 0.9 V to 4.9 V in 100 mV steps can

be manufactured.

Features

• Quiescent Current of 1.0 mA Typical

• High Accuracy Undervoltage Threshold of 2.0%

• Wide Operating Voltage Range of 0.8 V to 10 V

• Complementary or Open Drain Reset Output

• Active Low or Active High Reset Output

• Pb−Free Packages are Available

Typical Applications

• Microprocessor Reset Controller

• Low Battery Detection

• Power Fail Indicator

• Battery Backup Detection

http://onsemi.com

4

1

SC−82AB

SQ SUFFIX

CASE 419C

PIN CONNECTIONS AND

MARKING DIAGRAM

GND 4

3 N.C.

xxx M G

G

Reset 1

2 Vin

Output

(Top View)

xxx = Specific Device Code

M

= Date Code

G

= Pb−Free Package

(Note: Microdot may be in either location)

ORDERING INFORMATION

See detailed ordering and shipping information in the ordering

information section on page 19 of this data sheet.

NCP304xSQxxT1

Complementary Output Configuration

2

Input

*

Vref

1

Reset Output

4

GND

NCP305LSQxxT1

Open Drain Output Configuration

2

Input

1

Reset Output

Vref

4

GND

This device contains 38 active transistors.

This device contains 37 active transistors.

* The representative block diagram depicts active low reset output ‘L’ suffix devices. The comparator

input is interchanged for the active high output ‘H’ suffix devices.

Figure 1. Representative Block Diagrams

© Semiconductor Components Industries, LLC, 2006

1

May, 2006 − Rev. 18

Publication Order Number:

NCP304/D

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