Renesas ISL88011IH523Z-TK

Overview

ISL88011IH523Z-TK from Intersil is a 5-lead SOT-23 voltage supervisor IC with fixed 2.32V VDD monitoring threshold, ±1.5% accuracy over temperature, 200ms power-on reset timeout (adjustable via external capacitor), active-low and active-high complementary reset outputs, and manual reset input. It ensures reliable microprocessor startup and brownout protection in low-power embedded systems.

For engineers reviewing the ISL88011IH523Z-TK datasheet, ISL88011IH523Z-TK pinout, ISL88011IH523Z-TK application, or ISL88011IH523Z-TK equivalent, this device delivers precise single-supply monitoring with ultra-low 5.5µA supply current, reset validity down to VDD = 1V, and immunity to power-supply transients - critical for battery-powered and industrial control designs.

Technical Context

The ISL88011IH523Z-TK implements a precision bandgap-based voltage reference comparator with hysteresis (23mV at 2.32V trip point) to prevent chatter during supply recovery. Its POR circuit activates at ≥1V on VDD and holds reset asserted until VDD exceeds 2.32V for ≥200ms.

It features dual reset outputs: push-pull RST (active-high) and open-drain RST/MR (active-low), both debounced and valid across the full -40°C to +85°C industrial range. The MR input accepts pulses ≥1µs wide and <100mV to trigger system reset.

Key Specifications

Pinout & Package

Package: 5-lead SOT-23 (Pb-free, RoHS-compliant, JEDEC MO178AA, pkg drawing P5.064).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL88013IH523Z-TK, the ISL88011IH523Z-TK omits watchdog logic to reduce susceptibility to false triggers and simplify firmware integration; compared with MAX6326UR23-T, it adds CPOR adjustability and dual-reset polarity - enabling robust timing control and interface compatibility across mixed-logic systems.

Availability

ISL88011IH523Z-TK is available at Aetrix Electronics and suitable for industrial process controllers, portable medical monitors, and smart energy meters requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for ISL88011IH523Z-TK 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 is a precision analog and power management semiconductor provider, now part of Renesas Electronics, delivering high-reliability solutions for industrial, infrastructure, and embedded markets.

The ISL88011IH523Z-TK belongs to Intersil's ISL8801x family of voltage supervisors - designed specifically for low-power, high-accuracy supply monitoring in space-constrained embedded systems where reliability and parametric stability are critical.

FAQ

What is the factory-programmed voltage threshold of the ISL88011IH523Z-TK?

The ISL88011IH523Z-TK has a fixed VDD monitoring threshold of 2.32V, specified with ±1.5% accuracy over the full -40°C to +85°C operating temperature range. This value is laser-trimmed during manufacturing and does not require external resistors or calibration. The hysteresis is 23mV, ensuring stable reset release during supply recovery. This threshold is documented in the Ordering Information table (page 3) and Electrical Specifications (page 6) of FN8093 Rev 5.00.

Does the ISL88011IH523Z-TK support adjustable power-on reset timeout?

Yes, the ISL88011IH523Z-TK supports adjustable POR timeout via the CPOR pin. Connecting an external capacitor between CPOR and GND extends the nominal 200ms timeout - for example, a 30pF capacitor increases tPOR to approximately 2.5s. This feature is explicitly enabled on the ISL88011 and ISL88014 variants per the datasheet (page 1, "Unique features…" and Figure 3). No external resistor network is required; only a single capacitor is needed.

What are the reset output configurations available on the ISL88011IH523Z-TK?

The ISL88011IH523Z-TK provides two complementary reset outputs: RST (pin 3) is a push-pull active-high output, and RST/MR (pin 1) is an open-drain active-low output that also serves as the manual reset input. Both outputs are debounced and asserted simultaneously. RST drives to VDD–0.4V when inactive and ≤0.4V when active; RST/MR requires an external pull-up and sinks up to 5mA. This dual-output architecture supports interfacing with TTL, CMOS, and microcontroller reset inputs requiring either polarity.

Can the ISL88011IH523Z-TK monitor a secondary voltage like VMON?

No, the ISL88011IH523Z-TK does not support secondary voltage monitoring. Unlike the ISL88012, ISL88014, or ISL88015 variants, the ISL88011IH523Z-TK lacks a VMON pin and is configured exclusively for single-supply (VDD) monitoring. Its pinout (page 2) shows CPOR on pin 5, not VMON. The datasheet confirms VMON functionality applies only to ISL88012/ISL88014/ISL88015 (page 5, Product Features Table), and the ISL88011IH523Z-TK ordering row specifies VTHVMON = N/A (page 3).

What is the minimum supply voltage at which the ISL88011IH523Z-TK guarantees reset assertion?

The ISL88011IH523Z-TK guarantees valid reset assertion down to VDD = 1V, as stated in the datasheet Features section (page 1) and confirmed in the Absolute Maximum Ratings (page 6). Below 1V, the internal circuitry may become nonfunctional, but above 1V, the reset signal remains asserted whenever VDD falls below the 2.32V threshold - including during deep brownout conditions. This ensures fail-safe behavior even as battery voltage decays in portable applications.