Renesas ISL88041IBZ-T

Overview

ISL88041IBZ-T from Intersil is a quad voltage-monitoring supervisor IC that detects undervoltage conditions on four independent power rails ≥0.7V, asserts an active-low open-drain RST signal when any rail falls below its threshold, and supports manual reset via MR input. It operates from 2.7V to 4V VDD, features 30µs glitch immunity, and delivers valid reset down to VDD = 1V - used in multi-rail DSP/processor systems requiring reliable power sequencing.

For engineers reviewing the ISL88041IBZ-T datasheet, ISL88041IBZ-T pinout, ISL88041IBZ-T application, or ISL88041IBZ-T equivalent, key selection criteria include adjustable undervoltage thresholds per rail, internal 20kΩ RST pull-up, MR-triggered reset timing (tMR = 15ns), VDD lock-out behavior (2.4V/2.6V hysteresis), and SOIC-8 packaging for space-constrained embedded control designs.

Technical Context

The ISL88041IBZ-T implements four independent comparator channels, each comparing a VMON input voltage against a precision 635mV internal reference with 10mV hysteresis. Each channel includes a 30µs digital glitch filter to reject transients, ensuring robust monitoring in noisy power environments.

VDD lock-out circuitry disables monitoring until VDD rises above 2.6V and re-engages reporting only after stabilization; the RST output remains asserted low until all four monitored voltages exceed their respective thresholds and remain stable, with deassertion delay tRPD ≤ 1.5µs.

Key Specifications

Pinout & Package

ISL88041IBZ-T is housed in an 8-lead SOIC package (JEDEC MS-012-AA, pkg drawing M8.15), measuring 4.9mm × 3.9mm × 1.5mm, RoHS-compliant with matte tin (e3) termination.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6804US29D3+T and TPS3307-33DGNR, the ISL88041IBZ-T uniquely supports four independently adjustable thresholds, VDD lock-out hysteresis, and MR-initiated reset - making it optimal for complex multi-rail embedded systems requiring flexible, noise-immune supervision.

Availability

ISL88041IBZ-T 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 sourcing.

Supply support for ISL88041IBZ-T 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 analog and mixed-signal semiconductor company founded in 1967, specializing in power management, precision analog, and interface ICs.

The ISL88041IBZ-T belongs to Intersil's voltage supervisor product line, designed specifically for reliable, multi-rail power sequencing and undervoltage protection in high-reliability embedded, telecom, and medical electronics.

FAQ

What is the minimum operating voltage for ISL88041IBZ-T to assert a valid reset signal?

The ISL88041IBZ-T guarantees valid RST output behavior down to VDD = 1V, meaning the reset signal remains electrically functional and meets VOL ≤ 0.1V specifications even during severe brown-out conditions. This capability is critical for battery-powered devices where supply voltage may sag below nominal levels during peak load, ensuring continued system supervision without loss of reset integrity.

How does the ISL88041IBZ-T handle short voltage transients on monitored rails?

The ISL88041IBZ-T incorporates a 30µs digital glitch filter on each VMON input, rejecting transients shorter than this duration to prevent false reset assertions. This design ensures that brief supply dips - such as those caused by switching noise or load-step events - do not trigger unnecessary system resets, improving overall system robustness in electrically noisy environments.

Can the ISL88041IBZ-T monitor a 1.2V rail, and what resistor values are recommended?

Yes, the ISL88041IBZ-T can monitor a 1.2V rail using the V1MON–V4MON inputs with external resistor dividers. For a 1.2V rail targeting 90% trip (1.08V), use Equation 1: VTRIP = 0.635V × (1 + R1/R2). A typical solution uses R2 = 10kΩ and R1 = 6.98kΩ, yielding VTRIP ≈ 1.08V - confirmed in the ISL88041EVAL1 schematic on page 6 of FN9229 Rev 2.00.

Does the ISL88041IBZ-T require an external pull-up resistor on the RST pin?

No, the ISL88041IBZ-T integrates a 20kΩ pull-up resistor from RST to VDD, eliminating the need for an external component in most 2.7V–4V systems. An external pull-up is only required if interfacing to logic families operating above VDD (e.g., 5V TTL), where the internal resistor cannot establish a valid high level.

What is the purpose of the VDD lock-out feature in the ISL88041IBZ-T?

The VDD lock-out feature prevents spurious reset behavior during power-up and power-down by disabling monitoring until VDD rises above 2.6V and reasserting lock-out if VDD falls below 2.4V. This hysteresis ensures the ISL88041IBZ-T only begins supervising rails once stable bias is established - avoiding premature reset release or false assertion during supply ramping.