Renesas ISL88011IH544Z-TK

Overview

ISL88011IH544Z-TK from Intersil is a 5-lead SOT-23 voltage supervisor IC with fixed 4.38V VDD monitoring, active-low and active-high reset outputs (RST/MR and RST), adjustable Power-On Reset timeout via external capacitor on CPOR pin, manual reset input, and operation down to VDD = 1V. It delivers ±1.5% threshold accuracy and ultra-low 5.5µA supply current for reliable power sequencing in microprocessor-based systems.

For engineers reviewing the ISL88011IH544Z-TK datasheet, ISL88011IH544Z-TK pinout, ISL88011IH544Z-TK application, or ISL88011IH544Z-TK equivalent, key selection criteria include its fixed 4.38V trip point, dual-reset output architecture, CPOR-adjustable POR delay, industrial temperature range (–40°C to +85°C), and compatibility with low-voltage brownout detection in embedded controllers and portable equipment.

Technical Context

The ISL88011IH544Z-TK implements a precision bandgap-based voltage reference comparator with hysteresis (44mV at 4.38V) to monitor VDD against a factory-programmed 4.38V threshold. It asserts complementary reset signals when VDD drops below this level or during power-up until the POR timeout elapses.

Its CPOR pin enables external RC adjustment of the nominal 200–250ms POR delay-e.g., a 30pF capacitor extends tPOR to ~2.5s-while the RST/MR pin integrates debounced manual reset functionality and open-drain reset output in a single terminal.

Key Specifications

Pinout & Package

ISL88011IH544Z-TK uses a Pb-free 5-lead SOT-23 package (JEDEC MO-178AA, Intersil P5.064), measuring 2.80 × 1.90 × 1.45 mm, with gull-wing leads and 0.95 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL88013IH544Z-TK, the ISL88011IH544Z-TK omits watchdog circuitry to reduce design complexity and power overhead, while retaining identical voltage accuracy, POR adjustability, and dual-reset capability. Against TLV803EB29DBZR, it trades lower quiescent current for higher trip voltage, dual outputs, and programmable timing - making it optimal for industrial 5V systems demanding robust reset signaling.

Availability

ISL88011IH544Z-TK is available at Aetrix Electronics and suitable for industrial PLCs, portable medical monitors, embedded network routers, and automotive infotainment head units requiring stable component supply with guaranteed long-term availability.

Supply support for ISL88011IH544Z-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 semiconductor manufacturer specializing in precision analog and power management solutions, now part of Renesas Electronics.

The ISL88011IH544Z-TK belongs to Intersil's ISL8801x family of voltage supervisors, designed specifically for reliable power-on reset generation, brownout detection, and manual reset integration in space-constrained embedded systems.

FAQ

What is the exact voltage threshold and accuracy of the ISL88011IH544Z-TK?

The ISL88011IH544Z-TK has a factory-programmed VDD voltage threshold of 4.38V with ±1.5% accuracy over the full industrial temperature range (–40°C to +85°C). This value is confirmed in the Ordering Information table (Page 3) and Electrical Specifications (Page 6) of FN8093 Rev 5.00, where VTHVDD min/typ/max are listed as 4.31V/4.38V/4.45V. The device uses internal hysteresis (44mV) to prevent false triggering near the trip point.

Does the ISL88011IH544Z-TK support adjustable Power-On Reset timeout, and how is it implemented?

Yes, the ISL88011IH544Z-TK 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 is documented in Figure 3 (Page 9) and Principles of Operation (Page 9) of FN8093 Rev 5.00. No resistor is required; only the capacitor defines the timing.

What are the reset output configurations supported by the ISL88011IH544Z-TK?

The ISL88011IH544Z-TK provides two complementary reset outputs: RST (active-high push-pull) and RST/MR (active-low open-drain). As shown in the Pin Descriptions (Page 5) and Functional Block Diagram (Page 4), RST drives to VDD when inactive and pulls low during reset, while RST/MR remains high-impedance until reset, then pulls to GND. This dual-output architecture eliminates external logic for interfacing with mixed-signaling µPs or FPGAs.

Can the ISL88011IH544Z-TK monitor a second voltage rail, such as VMON?

No, the ISL88011IH544Z-TK does not support VMON input. Per the Product Features Table (Page 5) and Ordering Information (Page 3), ISL88011 variants like ISL88011IH544Z-TK have "N/A" for VTHVMON and lack VMON functionality. Dual-supply monitoring is exclusive to ISL88012, ISL88014, and ISL88015. The ISL88011IH544Z-TK monitors only VDD at its fixed 4.38V threshold.

What is the minimum operating supply voltage for reliable reset assertion in the ISL88011IH544Z-TK?

The ISL88011IH544Z-TK asserts valid reset signals down to VDD = 1V, as explicitly stated in the Features list (Page 1) and confirmed in the Absolute Maximum Ratings (Page 6). This ensures fail-safe supervision even during severe brownout conditions where the supply collapses below typical logic thresholds, allowing controlled shutdown before data corruption occurs.