Intel Intersil ISL88021 ISL88022 Five-Voltage Monitor Specifications Manual
Summary
Monitor system integrity with customizable triple voltage supervisors designed for demanding embedded, portable, and multi-voltage applications. These chips reliably detect undervoltage, overvoltage conditions, and manage power-on reset sequences to prevent system failure. Featuring adjustable threshold voltages and ultra-low consumption, they guarantee maximum operational stability in critical environments. This guide provides comprehensive technical details, installation parameters, and system integration advice for optimizing voltage supervision across complex circuits.
Page 1 Text Content
ISL88021, ISL88022
Data Sheet September 18, 2006 FN8226.1
Triple Voltage Monitor with Adjustable Features Power-On-Reset and Undervoltage/
Triple Voltage Monitor and Reset Assertion
Overvoltage Monitoring Capability
Low VDD Detection and Reset Assertion
The ISL88021 and ISL88022 family of devices are
Adjustable Reset Threshold Voltages
customizable triple voltage-monitoring supervisors that
0.6V ±6m V Over -40°C to +85°C
assert a reset if any of the monitored voltages becomes
Reset Signal Valid to VDD = 1V
non-compliant. They offer popular functions such as Power-On-Reset timing control with both RESET and 140ms Minimum Reset Pulse Delay that is Customizable
RESET outputs, Supply Voltage Supervision, both under or Using an External Capacitor
overvoltage detection, and Manual Reset assertion. By
Both RST and RST Outputs Available
offering these features in a small 8 Ld MSOP package, the
Undervoltage/Overvoltage Monitoring Capability
ISL88021 and ISL88022 can lower system cost, reduce board space requirements and increase the reliability of Low 20µA Consumption systems.
Small 8 Ld MSOP Package
Applying a voltage to VDD activates the Power-On-Reset
Pb-Free Plus Anneal Available (Ro HS Compliant)
circuit which holds RESET low for an adjustable period of time. This allows the power supply and system oscillator to
Applications
stabilize before the processor can execute code.
Process Control Systems
Low VDD detection circuitry protects the user’s system from
Intelligent Instruments
low voltage conditions, resetting the system when VDD falls below its minimum preset voltage threshold VTH1. Reset Embedded Control Systems remains asserted until VDD returns to its proper operating
Computer Systems
level and stabilizes. Two additional voltage monitoring w.BDTIC.com/Intersil inputs, V2MON (preset) and V3MON (adjustable), monitor Portable/Battery-Powered Equipment other supplies to provide reliable system operation.
Multi-Voltage Systems
The ISL88021 V3MON input monitors for undervoltage (UV)
Pinout
conditions whereas the ISL88022 V3MON input allows
monitoring for overvoltage (OV) conditions. The monitored ISL88021, ISL88022 (8 LD MSOP)
voltage on V3MON on either device is compared via a
TOP VIEW
resistor divider to a 600m V internal reference. Hence, any voltage more or less positive than this reference can be accurately monitored to meet specific system level MR RST requirements or to fine-tune the threshold for applications
VDD RST
requiring higher precision.
V2MON CPOR
These devices also let users increase the Power-On-Reset time-out delay by connecting a capacitor between CPOR and
GND V3MON
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.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Page Summary Contents For Intel Intersil ISL88021 ISL88022 Five-Voltage Monitor Specifications Manual
Manual Details
| Brand | Intel |
|---|---|
| Pages | 7 |
| File Size | 185.00 KB |
| Published | May 30, 2026 |
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Frequently Asked Questions
How do I adjust the Power-On-Reset (POR) timing delay?
You can increase the POR time-out delay by connecting a capacitor between C and POR GND.
Do these devices monitor for both undervoltage and overvoltage conditions?
Yes. The ISL88021 monitors for undervoltage (UV), while the ISL88022 can monitor for overvoltage (OV) on V3MON.
How do I ensure the highest precision when monitoring voltage thresholds?
The monitored voltage is compared via a TOP VIEW resistor divider to a 600mV internal reference, allowing accurate fine-tuning of the threshold.
What safety precautions should be observed during handling?
These devices are sensitive to electrostatic discharge, so proper IC Handling Procedures must be followed.