Renesas ISL6536AIBZ

Overview

ISL6536AIBZ from Intersil is a four-channel voltage supervisory IC that monitors up to four positive supply rails >0.7V using external resistor dividers and an internal 0.633V reference with ±1% threshold accuracy. It features open-drain PGOOD output, ENABLE input with 10µA internal pull-up, and 30µs glitch immunity on all VMON inputs. Used in graphics cards and multi-rail DSP/processor power systems.

For engineers reviewing the ISL6536AIBZ datasheet, ISL6536AIBZ pinout, ISL6536AIBZ application, or ISL6536AIBZ equivalent, key selection criteria include adjustable undervoltage lockout per rail, guaranteed PGOOD validity down to VDD = 1V, 2µs PGOOD release delay after VMON stabilization, and Pb-free SOIC-8 packaging compliant with IPC/JEDEC J-STD-020B reflow profiles.

Technical Context

The ISL6536AIBZ implements a Boolean AND logic function across four independently programmable VMON inputs, each compared to a precision 0.633V internal reference with 33µV/°C tempco and 10mV hysteresis. Its PGOOD output remains low until all monitored voltages exceed their thresholds and releases within 2µs of the last valid VMON input crossing the rising threshold.

VDD bias range is 2.7V to 5.5V; PGOOD is open-drain with internal 20kΩ pull-up to VDD and supports external pull-up for level-shifting. ENABLE has 0.4VDD–0.6VDD rising threshold, 65mV hysteresis, and responds to falling edges in 15ns to force PGOOD low.

Key Specifications

Pinout & Package

ISL6536AIBZ is housed in an 8-lead narrow-body SOIC package (JEDEC MS-012-AA, pkg drawing M8.15), Pb-free with 100% matte tin terminations, compatible with SnPb and Pb-free soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3307-33D and MAX6816CUA+, the ISL6536AIBZ provides full four-channel supervision with user-adjustable thresholds, ENABLE control, and guaranteed sub-1V PGOOD validity-making it optimal for compact, multi-rail embedded systems where sequencing integrity and brown-out resilience are critical.

Availability

ISL6536AIBZ is available at Aetrix Electronics and suitable for graphics cards, multi-voltage DSPs and processors, and embedded control systems requiring stable component supply with long-term industrial temperature support.

Supply support for ISL6536AIBZ 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, designs high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The ISL6536AIBZ belongs to Intersil's supervisory IC product line, engineered specifically for reliable multi-rail power validation in graphics, telecom, and medical equipment where timing accuracy and glitch immunity are essential.

FAQ

What is the minimum VDD voltage required for ISL6536AIBZ to assert a valid PGOOD signal?

The ISL6536AIBZ guarantees PGOOD validity down to VDD = 1V, meaning the output remains electrically well-defined and meets its logic thresholds even as the bias supply falls below typical operating range. This feature allows the ISL6536AIBZ to detect brown-out conditions and maintain accurate power-status signaling during controlled power-down sequences in systems like graphics cards and medical devices.

How does the ISL6536AIBZ handle transient noise on monitored supply rails?

The ISL6536AIBZ incorporates a built-in 30µs digital glitch filter on each VMON input, rejecting supply transients shorter than this duration to prevent spurious PGOOD deassertion. This eliminates the need for external RC filtering components and ensures robust operation in noisy environments such as multi-rail DSP boards or industrial embedded controllers where rail coupling and switching noise are common.

Can unused VMON inputs on the ISL6536AIBZ be left floating?

No - unused VMON inputs on the ISL6536AIBZ must be tied to VDD to prevent undefined comparator behavior and potential PGOOD malfunction. The datasheet explicitly states that connecting unmonitored VMON pins to VDD ensures they remain above the 0.633V reference threshold, allowing the PGOOD output to reflect only the status of actively supervised rails.

Does the ISL6536AIBZ require an external pull-up resistor on the PGOOD pin?

No - the ISL6536AIBZ includes an internal 20kΩ pull-up resistor from PGOOD to VDD, making an external pull-up unnecessary for standard 3.3V or 5V logic interfacing. However, an external pull-up may still be added to a different voltage rail (e.g., 1.8V) to support level-shifted PGOOD signaling in mixed-voltage systems.

What is the temperature coefficient of the internal voltage reference in the ISL6536AIBZ?

The internal 0.633V reference in the ISL6536AIBZ has a temperature coefficient of 33µV/°C, resulting in a total drift of approximately ±10mV over the full -40°C to +85°C operating range. This low tempco contributes to the ±1% overall VMON threshold accuracy and ensures consistent undervoltage detection across industrial temperature extremes in applications like network routers and intelligent instruments.