_______________General Description

The ICL7665 warns microprocessors (

µPs) of overvolt-

age and undervoltage conditions. It draws a typical

operating current of only 3µA. The trip points and hys-

teresis of the two voltage detectors are individually pro-

grammed via external resistors to any voltage greater

than 1.3V. The ICL7665 will operate from any supply

voltage in the 1.6V to 16V range, while monitoring volt-

ages from 1.3V to several hundred volts. The Maxim

ICL7665A is an improved version with a 2%-accurate

temperature.

The 3µA quiescent current of the ICL7665 makes it

ideal for voltage monitoring in battery-powered sys-

tems. In both battery- and line-powered systems, the

unique combination of a reference, two comparators,

and hysteresis outputs reduces the size and compo-

nent count of many circuits.

________________________Applications

µP Voltage Monitoring

Low-Battery Detection

Power-Fail and Brownout Detection

Battery Backup Switching

Power-Supply Fault Monitoring

Over/Undervoltage Protection

High/Low Temperature, Pressure, Voltage Alarms

____________________________Features

o µP Over/Undervoltage Warning

o Improved Second Source

o Dual Comparator with Precision Internal Reference

o 3µA Operating Current

o 2% Threshold Accuracy (ICL7665A)

o 1.6V to 16V Supply Voltage Range

o On-Board Hysteresis Outputs

o Externally Programmable Trip Points

o Monolithic, Low-Power CMOS Design

______________Ordering Information

Ordering Information continued on last page.

Microprocessor Voltage Monitor with

Dual Over/Undervoltage Detection

________________________________________________________________

Maxim Integrated Products

1

1

2

3

4

8

7

6

5

OUT2

SET2

HYST2

GND

SET1

HYST1

OUT1

ICL7665

DIP/SO

TOP VIEW

2

8

4

6

1

7

3

5

ICL7665

V+ (CASE)

HYST2

SET2

OUT2

OUT1

HYST1

SET1

TO-99

GND

V+

_________________Pin Configurations

ICL7665

OUT1

OUT2

SET2

SET1

V+

V+

8

4

1

7

6

3

GND

OVERVOLTAGE

DETECTION

UNDERVOLTAGE

DETECTION

SIMPLE THRESHOLD DETECTOR

NMI

__________Typical Operating Circuit

19-0001; Rev 2; 8/97

PART

TEMP. RANGE

PIN-PACKAGE

ICL7665CPA

0°C to +70°C

8 Plastic DIP

ICL7665ACPA

0°C to +70°C

8 Plastic DIP

ICL7665BCPA

0°C to +70°C

8 Plastic DIP

ICL7665CSA

0°C to +70°C

8 SO

ICL7665ACSA

0°C to +70°C

8 SO

ICL7665BCSA

0°C to +70°C

8 SO

ICL7665CJA

0°C to +70°C

8 CERDIP

ICL7665ACJA

0°C to +70°C

8 CERDIP

ICL7665BCJA

0°C to +70°C

8 CERDIP

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.