1

®

FN8226.1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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ISL88021, ISL88022

Triple Voltage Monitor with Adjustable

Power-On-Reset and Undervoltage/

Overvoltage Monitoring Capability

The ISL88021 and ISL88022 family of devices are

customizable triple voltage-monitoring supervisors that

assert a reset if any of the monitored voltages becomes

non-compliant. They offer popular functions such as

Power-On-Reset timing control with both RESET and

RESET outputs, Supply Voltage Supervision, both under or

overvoltage detection, and Manual Reset assertion. By

offering these features in a small 8 Ld MSOP package, the

ISL88021 and ISL88022 can lower system cost, reduce

board space requirements and increase the reliability of

systems.

circuit which holds RESET low for an adjustable period of

time. This allows the power supply and system oscillator to

stabilize before the processor can execute code.

level and stabilizes. Two additional voltage monitoring

inputs, V2MON (preset) and V3MON (adjustable), monitor

other supplies to provide reliable system operation.

The ISL88021 V3MON input monitors for undervoltage (UV)

conditions whereas the ISL88022 V3MON input allows

monitoring for overvoltage (OV) conditions. The monitored

voltage on V3MON on either device is compared via a

resistor divider to a 600mV internal reference. Hence, any

voltage more or less positive than this reference can be

accurately monitored to meet specific system level

requirements or to fine-tune the threshold for applications

requiring higher precision.

These devices also let users increase the Power-On-Reset

ground. This lengthens the period of an internal clock

counter thereby increasing the time between voltage

compliance and reset outputs signaling.

A manual reset input provides debounce circuitry for

minimum reset component count.

Features

• Triple Voltage Monitor and Reset Assertion

- Adjustable Reset Threshold Voltages

- 0.6V ±6mV Over -40°C to +85°C

• 140ms Minimum Reset Pulse Delay that is Customizable

Using an External Capacitor

• Both RST and RST Outputs Available

• Undervoltage/Overvoltage Monitoring Capability

• Low 20µA Consumption

• Small 8 Ld MSOP Package

• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

• Process Control Systems

• Intelligent Instruments

• Embedded Control Systems

• Computer Systems

• Portable/Battery-Powered Equipment

• Multi-Voltage Systems

Pinout

ISL88021, ISL88022

(8 LD MSOP)

TOP VIEW

1

2

3

4

8

7

6

5

V2MON

GND

RST

RST

V3MON

MR

Data Sheet

September 18, 2006