Renesas ISL6536IB

Overview

ISL6536IB from Intersil is a four-channel supervisory IC that monitors up to four independent positive supply rails (>0.7V) using external resistor dividers and an internal 0.63V reference. It features open-drain PGOOD with guaranteed validity down to VDD = 1V, 30µs glitch immunity on VMON inputs, and ENABLE-controlled reset. It is used in graphics cards and multi-rail DSP/processor power systems.

For engineers reviewing the ISL6536IB datasheet, ISL6536IB pinout, ISL6536IB application, or ISL6536IB equivalent, key selection criteria include adjustable undervoltage lockout per rail, PGOOD timing delays (≤2µs), EN/VMON threshold hysteresis (65mV), VDD operating range (2.7–4V), and SOIC-8 RoHS-compliant packaging.

Technical Context

The ISL6536IB implements a Boolean AND logic function across four independently programmable VMON inputs, each compared against a stable 0.63V internal reference with ±10mV hysteresis and 100µV/°C temperature coefficient. Its PGOOD output releases within 2µs after the last valid VMON input crosses threshold and responds to EN falling edge in 15ns.

VDD biasing (2.7–4V) powers internal circuitry while enabling operation down to 1V for brown-out detection; the ENABLE pin includes a 10µA pull-up and 0.4–0.6×VDD threshold with 65mV hysteresis, supporting push-button or logic-level reset initiation.

Key Specifications

Pinout & Package

ISL6536IB is housed in an 8-lead narrow-body SOIC package (JEDEC MS-012-AA, pkg drawing M8.15), with 1.27mm lead pitch, 4.00mm body width, and RoHS-compliant matte tin (e3) termination.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar four-channel supervisory IC applications.

Compared with TPS3307-33D and MAX6816ESE+, the ISL6536IB uniquely supports 2.7–4V bias, four independent VMON inputs with 30µs filtering, and integrated 20kΩ PGOOD pull-up-enabling compact, flexible, and noise-immune power supervision in space-constrained multi-rail systems.

Availability

ISL6536IB is available at Aetrix Electronics and suitable for graphics cards, embedded control systems, and medical equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL6536IB 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 ISL6536IB belongs to Intersil's supervisory IC product line, engineered for high-reliability multi-rail power monitoring in graphics, telecom, and embedded systems where fast, glitch-immune PGOOD assertion is essential.

FAQ

What is the minimum VDD voltage required for ISL6536IB to assert PGOOD?

The ISL6536IB asserts PGOOD only after VDD rises above 2.6V (VDD_L2H specification). Below this threshold, PGOOD remains low regardless of VMON input states. The IC continues to validate PGOOD down to VDD = 1V, ensuring reliable brown-out detection during power collapse. This behavior is confirmed in the Absolute Maximum Ratings and Electrical Specifications sections of the FN9114 datasheet for ISL6536IB.

Can ISL6536IB monitor a 5V rail directly?

No, ISL6536IB cannot monitor a 5V rail directly because its VMON inputs are rated for −0.3V to VDD+0.3V, and VDD max is +4V. To supervise a 5V rail, use an external resistor divider to scale it down to ≤0.633V at the VMON pin. For example, a 7.9:1 divider reduces 5V to 0.633V. This method is explicitly supported in the datasheet and preserves the 0.63V reference accuracy and 30µs glitch immunity.

Does ISL6536IB require an external pull-up resistor on PGOOD?

No, ISL6536IB does not require an external pull-up resistor on PGOOD because it includes a factory-trimmed 20kΩ internal pull-up to VDD. This feature is documented in the Pin Descriptions and Electrical Specifications tables of the FN9114 datasheet. External pull-ups may be added only if interfacing to logic levels higher than VDD or for stronger drive capability, but they are optional-not mandatory-for standard 3.3V operation.

How does the ENABLE pin function in ISL6536IB?

The ENABLE pin on ISL6536IB is an active-low input with a 10µA internal pull-up to VDD and a threshold of 0.4–0.6×VDD. Pulling ENABLE below 0.5V forces immediate PGOOD deassertion, providing hardware reset capability. It can be driven by a push-button to ground or standard logic outputs. The 65mV hysteresis prevents chatter during slow transitions, as verified in the Electrical Specifications table under VEN_HYS.

What is the purpose of the 30µs glitch filter on VMON inputs?

The 30µs glitch filter on each VMON input prevents brief supply transients-such as switching noise or coupling spikes-from falsely triggering PGOOD deassertion. This filter is implemented internally and applies to all four VMON pins. It ensures PGOOD remains asserted unless a rail genuinely falls below its programmed threshold for more than 30µs, a specification confirmed in both the Features list and Electrical Specifications (TFIL parameter) of the ISL6536IB datasheet.