Renesas ISL88022IU8HFZ

Overview

ISL88022IU8HFZ from Intersil is a triple voltage supervisor IC with overvoltage monitoring on V3MON, fixed 4.64V VDD trip threshold, fixed 3.09V V2MON threshold, and 0.595V internal reference for adjustable OV detection. It provides both active-low open-drain RST and active-high push-pull RST outputs, supports manual reset with internal 20kΩ pull-up, and operates from 2.0V to 5.5V supply across –40°C to +85°C. Used in multi-rail embedded systems requiring reliable power sequencing and fault detection.

For engineers reviewing the ISL88022IU8HFZ datasheet, ISL88022IU8HFZ pinout, ISL88022IU8HFZ application, or ISL88022IU8HFZ equivalent, key selection criteria include its OV-capable V3MON input (vs. UV-only ISL88021), 140–200ms POR timeout with CPOR adjustability, dual-reset output topology, low 15µA quiescent current, and MSOP-8 package compatibility with space-constrained industrial control and portable designs.

Technical Context

The ISL88022IU8HFZ implements a comparator-based triple-monitor architecture: VDD and V2MON use factory-trimmed fixed thresholds (4.64V and 3.09V), while V3MON compares external divided voltage against a 0.595V internal reference to detect overvoltage conditions. Reset assertion requires violation of any monitored rail plus tPOR delay compliance.

Its POR circuit activates when VDD exceeds 1V, holding RST low until all rails stabilize and tPOR elapses; CPOR pin capacitance linearly extends nominal 175ms tPOR up to ~10× with ≤50pF. MR input features 550ns minimum pulse width and debounced active-low logic with internal pull-up.

Key Specifications

Pinout & Package

ISL88022IU8HFZ is housed in an 8-lead MSOP package (3.0mm × 3.0mm × 1.0mm body height, 0.65mm lead pitch) compliant with JEDEC MO-187AA, RoHS-compliant with Pb-free plus anneal finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple-voltage supervisor applications.

Compared with MAX6326US31D3+ and TPS3808G33DBVR, the ISL88022IU8HFZ uniquely delivers overvoltage detection on its third input, factory-trimmed dual fixed thresholds, and dual-output reset signaling - enabling compact, single-chip supervision of heterogeneous multi-voltage systems without design compromises.

Availability

ISL88022IU8HFZ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom line cards, automotive infotainment gateways, and portable/battery-powered equipment requiring stable component supply and long-term lifecycle support.

Supply support for ISL88022IU8HFZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Intersil Corporation (now part of Renesas Electronics) is a semiconductor manufacturer specializing in precision analog, power management, and interface ICs for industrial, computing, and communications markets.

The ISL88022IU8HFZ belongs to Intersil's voltage supervisor product line, designed specifically for robust, low-power, multi-rail power integrity monitoring in mission-critical embedded systems where overvoltage fault detection is essential.

FAQ

What is the VDD trip threshold voltage for ISL88022IU8HFZ?

The ISL88022IU8HFZ has a factory-trimmed VDD trip threshold of 4.64V, with a tolerance of ±7.4mV over –40°C to +85°C. This value is confirmed in the Electrical Specifications table of FN8226 Rev 1.00, where VTH1 for IU8HxZ variants is specified as 4.565V (min), 4.649V (typ), and 4.733V (max). The ISL88022IU8HFZ uses the 'H' suffix denoting the 4.64V VDD threshold group.

Does ISL88022IU8HFZ support overvoltage monitoring on V3MON?

Yes, the ISL88022IU8HFZ supports overvoltage monitoring on the V3MON pin, distinguishing it from the ISL88021 family. As stated in the datasheet Functional Description and Ordering Information tables, ISL88022 variants (including ISL88022IU8HFZ) configure V3MON for OV detection by comparing the external divided voltage to a 0.595V internal reference. This is explicitly contrasted with ISL88021's UV-only V3MON behavior.

What is the maximum recommended capacitance for the CPOR pin on ISL88022IU8HFZ?

The maximum recommended capacitance for the CPOR pin on ISL88022IU8HFZ is 50pF, as specified in the "Adjusting tPOR" section of FN8226 Rev 1.00. Exceeding this value may cause timing inaccuracies or exceed absolute maximum ratings. The datasheet also notes that stray PCB capacitance should be minimized to maintain tPOR accuracy, and that an open CPOR yields a nominal 175ms delay.

What are the reset output types provided by ISL88022IU8HFZ?

The ISL88022IU8HFZ provides two complementary reset outputs: RST is an active-low open-drain output requiring an external pull-up resistor, and RST is an active-high push-pull output capable of sourcing 2.5mA at VDD ≥3.3V. This dual-output architecture allows direct interface with both legacy and modern microcontrollers without level-shifting or additional logic.

Is ISL88022IU8HFZ compatible with Pb-free soldering processes?

Yes, ISL88022IU8HFZ is offered in a Pb-free plus anneal version (RoHS compliant), as indicated in the Features list and Ordering Information notes of FN8226 Rev 1.00. It uses 100% matte tin plate termination and meets or exceeds IPC/JEDEC J-STD-020 reflow profiles for Pb-free assembly, including peak temperatures up to 260°C.