Renesas ISL6536IBZ-T

Overview

ISL6536IBZ-T from Renesas Electronics (formerly Intersil) is a four-channel voltage 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 output 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 ISL6536IBZ-T datasheet, ISL6536IBZ-T pinout, ISL6536IBZ-T application, or ISL6536IBZ-T equivalent, key selection criteria include adjustable undervoltage lockout per rail, PGOOD delay timing (≤2µs), EN threshold hysteresis (65mV), VMON temperature coefficient (100µV/°C), and SOIC-8 RoHS-compliant packaging for industrial embedded and telecom power sequencing.

Technical Context

The ISL6536IBZ-T implements a Boolean AND logic function across four independently configured VMON inputs, each compared against a stable 0.63V internal reference with 10mV hysteresis and 100µV/°C tempco. Its PGOOD output releases within 2µs after the last valid VMON input crosses threshold and responds to faults within 10ns–10µs depending on fault source.

It operates from a 2.7V–4.0V bias supply, maintains PGOOD validity during VDD decay to 1V, and rejects transients ≤30µs via integrated glitch filters. The ENABLE pin has a 0.4VDD–0.6VDD rising threshold with 10µA internal pull-up, enabling push-button or logic-level reset control without external components.

Key Specifications

Pinout & Package

ISL6536IBZ-T is housed in an 8-lead narrow-body SOIC package (JEDEC MS-012-AA, pkg drawing M8.15), RoHS-compliant with matte tin (e3) termination and MSL3 Pb-free reflow profile.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3307-33D and MAX6804US29D3+, the ISL6536IBZ-T uniquely supports four independently adjustable rails, integrates glitch filtering and ENABLE hysteresis, and guarantees PGOOD validity below 1V-making it optimal for complex, noise-prone multi-rail systems requiring deterministic sequencing.

Availability

ISL6536IBZ-T is available at Aetrix Electronics and suitable for graphics cards, multi-voltage DSPs and processors, and embedded control systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL6536IBZ-T 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 microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT applications.

The ISL6536IBZ-T belongs to Renesas' legacy Intersil power management portfolio, designed specifically for high-reliability, multi-rail voltage monitoring in graphics, telecom, and embedded computing platforms.

FAQ

What is the minimum VDD voltage required for ISL6536IBZ-T to assert PGOOD?

The ISL6536IBZ-T requires VDD ≥2.6V to release PGOOD after all VMON inputs are satisfied. Its PGOOD output remains valid down to VDD = 1V during power-down, but initial assertion requires ≥2.6V bias. This ensures reliable startup sequencing before downstream logic becomes active. The ISL6536IBZ-T datasheet specifies VDD_L2H = 2.6V as the minimum rising threshold for power-on reset release.

Can ISL6536IBZ-T monitor a 12V rail?

Yes, the ISL6536IBZ-T can monitor a 12V rail using an external resistor divider to scale the voltage down to ≤0.63V at the VMON pin. For example, a 12V rail with 1% tolerance requires a divider ratio of ~19:1 (e.g., 180kΩ top, 10kΩ bottom). The ISL6536IBZ-T's input leakage (<100nA) ensures minimal error. All four VMON pins support this configuration independently.

Does ISL6536IBZ-T require an external pull-up resistor on PGOOD?

No, the ISL6536IBZ-T includes a 20kΩ internal pull-up resistor to VDD on the PGOOD pin, eliminating the need for an external component. This simplifies board layout and supports wired-OR configurations with other open-drain supervisors. External pull-ups may still be added if interfacing to higher voltage logic (e.g., 5V), but are not required for standard 3.3V operation.

How does the 30µs glitch filter on ISL6536IBZ-T VMON inputs improve system reliability?

The 30µs hardware glitch filter prevents transient supply noise-such as switching regulator ripple, ESD coupling, or load-step artifacts-from falsely triggering PGOOD deassertion. This ensures the ISL6536IBZ-T only responds to sustained undervoltage conditions, avoiding spurious resets in electrically noisy environments like graphics cards or telecom line cards. Each VMON pin has its own independent filter.

What is the ENABLE pin hysteresis value for ISL6536IBZ-T, and why does it matter?

The ISL6536IBZ-T ENABLE pin has 65mV of hysteresis between rising and falling thresholds (VEN_HYS = 0.065V), specified over temperature. This prevents oscillation or chatter during slow-rising enable signals-common with RC-filtered reset lines or mechanical switches-and ensures clean, single-event reset initiation. The hysteresis is intrinsic to the ISL6536IBZ-T design and requires no external components.