Renesas ISL88011IH531Z-T7A

Overview

ISL88011IH531Z-T7A from Renesas (formerly Intersil) is a 5-lead SOT-23 voltage supervisor IC with fixed 3.09V VDD monitoring, active-low and active-high reset outputs, adjustable POR timeout via external capacitor, manual reset input, and operation down to VDD = 1V. It delivers ±1.5% threshold accuracy over -40°C to +85°C and draws only 5.5µA supply current, targeting microprocessor power sequencing in embedded control systems.

For engineers reviewing the ISL88011IH531Z-T7A datasheet, ISL88011IH531Z-T7A pinout, ISL88011IH531Z-T7A application, or ISL88011IH531Z-T7A equivalent, key selection criteria include its fixed 3.09V trip point, dual RST/RST outputs, CPOR-adjustable 200ms+ POR delay, manual reset capability, and immunity to power-supply transients in space-constrained industrial designs.

Technical Context

The ISL88011IH531Z-T7A integrates a precision bandgap reference, comparator with hysteresis (31mV at 3.09V), and POR timing circuitry. Its dual reset outputs are implemented as push-pull RST and open-drain RST/MR - enabling direct interface with both high- and low-active logic domains without external pull-ups.

Reset assertion occurs when VDD falls below 3.04V (min) or rises above 3.14V (max), with hysteresis ensuring noise immunity. The CPOR pin accepts an external capacitor to extend tPOR beyond the nominal 200–250ms, supporting FPGA configuration or slow-ramping supplies.

Key Specifications

Pinout & Package

Package: 5-lead SOT-23 (Pb-free, RoHS compliant, JEDEC MO178AA / EIAJ SC-74).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UR31-T and TPS3808G33DBVR, the ISL88011IH531Z-T7A uniquely provides complementary reset outputs and CPOR-based POR scalability while maintaining sub-6µA supply current - making it optimal for industrial embedded systems requiring flexible reset signaling and adaptive timing.

Availability

ISL88011IH531Z-T7A is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, automotive body controllers, and smart energy meters requiring stable component supply and long-term lifecycle support.

Supply support for ISL88011IH531Z-T7A 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

Renesas Electronics Corporation is a global semiconductor leader delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT markets.

The ISL88011IH531Z-T7A belongs to Renesas' legacy Intersil voltage supervisor family, designed specifically for high-accuracy, low-power power-on reset and supply monitoring in space-constrained embedded systems.

FAQ

What is the exact voltage threshold and accuracy of the ISL88011IH531Z-T7A?

The ISL88011IH531Z-T7A has a factory-programmed VDD trip voltage of 3.09V with ±1.5% accuracy over –40°C to +85°C, corresponding to a min/max range of 3.04V to 3.14V. This is confirmed in the Electrical Specifications table (page 6) of FN8093 Rev 5.00, and applies specifically to the ISL88011IH531Z-T7A variant per the Ordering Information table (page 3).

Does the ISL88011IH531Z-T7A support adjustable POR timeout, and how is it implemented?

Yes, the ISL88011IH531Z-T7A supports adjustable POR timeout via the CPOR pin. Connecting an external capacitor between CPOR and GND scales tPOR linearly - for example, a 30pF capacitor extends the nominal 200–250ms delay to approximately 2.5s. This behavior is documented in Figure 3 and the "Adjusting POR Timeout via CPOR Pin" section (page 9) of FN8093 Rev 5.00.

What are the reset output configurations available on the ISL88011IH531Z-T7A?

The ISL88011IH531Z-T7A provides two complementary reset outputs: RST (active-high, push-pull) and RST/MR (active-low, open-drain). RST drives directly to VDD or GND without external components; RST/MR requires an external pull-up for high-impedance release. This dual-output architecture is explicitly listed for ISL88011 in the Product Features Table (page 5) and Pin Descriptions (page 5).

Can the ISL88011IH531Z-T7A monitor a secondary voltage like VMON or WDI?

No - the ISL88011IH531Z-T7A monitors only the VDD supply (at 3.09V) and does not support secondary voltage monitoring. Unlike ISL88012/ISL88014, it lacks VMON functionality; unlike ISL88013/ISL88015, it has no WDI pin or watchdog timer. This is confirmed by its pinout (RST/MR, GND, RST, VDD, CPOR) and feature matrix on page 5 of FN8093 Rev 5.00.

What is the minimum operating voltage for reliable reset assertion in the ISL88011IH531Z-T7A?

The ISL88011IH531Z-T7A asserts valid reset signals down to VDD = 1V, as stated in the Features list (page 1) and confirmed in the Absolute Maximum Ratings and Recommended Operating Conditions (page 6) of FN8093 Rev 5.00. This ensures robust brownout detection even during severe undervoltage events.