Renesas ISL88041IBZ

Overview

ISL88041IBZ from Intersil is a quad voltage-monitoring supervisor IC that detects undervoltage conditions on four independent power rails (V1MON–V4MON) ≥0.7V using an internal 635mV reference and external resistor dividers; it asserts an active-low open-drain RST signal when any rail falls below its threshold, with glitch immunity to transients <30µs and guaranteed operation down to VDD = 1V; used in multi-rail DSP/processor systems requiring reliable power sequencing and reset control.

For engineers reviewing the ISL88041IBZ datasheet, ISL88041IBZ pinout, ISL88041IBZ application, or ISL88041IBZ equivalent, key selection criteria include adjustable undervoltage thresholds per rail, manual reset (MR) input compatibility, open-drain RST with integrated 20kΩ pull-up, VDD lock-out behavior (2.4V/2.6V), and SOIC-8 packaging for space-constrained embedded control and telecom equipment.

Technical Context

The ISL88041IBZ implements four independent comparator channels, each comparing a divided-down monitored voltage against a precision 635mV internal reference with 10mV hysteresis; all channels feed into a wired-OR logic structure that pulls RST low if any input violates its threshold after 30µs filtering.

VDD lock-out circuitry disables monitoring until VDD rises above 2.6V and re-engages reporting only after stabilization; MR input provides asynchronous reset assertion with 15ns delay and 50ns deassertion delay, referenced to 0.4VDD–0.6VDD thresholds and internally pulled up with 10µA.

Key Specifications

Pinout & Package

ISL88041IBZ is housed in an 8-lead narrow-body SOIC package (JEDEC MS-012-AA, pkg drawing M8.15), RoHS-compliant and rated for -40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad voltage monitoring applications.

Compared with TPS3307-33D and MAX6804US29D3+, the ISL88041IBZ uniquely supports four fully adjustable thresholds ≥0.7V, manual reset with fast timing, and guaranteed RST operation down to VDD = 1V-making it optimal for custom multi-voltage embedded and telecom platforms requiring field-programmable supervision.

Availability

ISL88041IBZ is available at Aetrix Electronics and suitable for graphics cards, multi-voltage DSPs, and embedded control systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.

Supply support for ISL88041IBZ 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 U.S.-based semiconductor company specializing in precision analog, power management, and interface ICs for industrial, computing, and communications markets.

The ISL88041IBZ belongs to Intersil's voltage supervisor product line, engineered for robust multi-rail power monitoring in systems where reliability, glitch immunity, and flexible threshold configuration are essential.

FAQ

What is the minimum detectable voltage per rail for the ISL88041IBZ?

The ISL88041IBZ supports monitoring of voltages ≥0.7V per rail using external resistor dividers. Its internal 635mV reference enables precise threshold setting; for example, a 1.2V rail can be scaled to 635mV via a 1:1.88 resistor ratio. This capability ensures compatibility with modern low-voltage ASICs, FPGAs, and processors without requiring additional level-shifting circuitry.

Does the ISL88041IBZ require external pull-up resistors on the RST output?

No, the ISL88041IBZ integrates a 20kΩ pull-up resistor from RST to VDD, eliminating the need for external components in most applications. The open-drain RST output remains compatible with external pull-ups for level translation or bus-ORing, but the internal resistor ensures valid reset signaling even when no external component is used.

How does the VDD lock-out function operate in the ISL88041IBZ?

The ISL88041IBZ incorporates VDD lock-out circuitry that disables monitoring until VDD rises above ~2.6V and re-engages reporting only after stabilization. If VDD falls below ~2.4V, monitoring is disabled again. This prevents false resets during power-up ramp or brown-out conditions, ensuring the RST signal reflects only stable rail conditions.

Can the ISL88041IBZ monitor four different voltage rails simultaneously?

Yes, the ISL88041IBZ monitors four independent voltage rails (V1MON–V4MON) simultaneously using dedicated comparator channels. Each input accepts a divided-down voltage referenced to the same 635mV internal reference, allowing fully customizable thresholds per rail. All channels feed into a single RST output that asserts low if any rail fails its threshold after 30µs filtering.

What is the glitch immunity specification for the ISL88041IBZ voltage monitor inputs?

The ISL88041IBZ provides 30µs glitch immunity on all VMON inputs, meaning transient supply dips shorter than 30µs are ignored by the internal digital filter. This prevents false reset assertions caused by switching noise, load transients, or coupling effects-critical for reliable operation in DC/DC converter-heavy systems like telecom routers and graphics cards.