Renesas ISL88031IU8ECZ

Overview

ISL88031IU8ECZ from Renesas Electronics is a quintuple voltage-monitoring supervisor IC with fixed VDD threshold of 2.866V and fixed V2MON threshold of 2.333V, ±1.8% threshold accuracy, 120ms nominal reset pulse width, and 19µA max supply current at 5V - used for power-on reset, undervoltage supervision, and manual reset in multi-rail systems.

For engineers reviewing the ISL88031IU8ECZ datasheet, ISL88031IU8ECZ pinout, ISL88031IU8ECZ application, or ISL88031IU8ECZ equivalent, key selection criteria include dual fixed-voltage monitoring thresholds, adjustable third/fourth/fifth inputs (≥0.6V), open-drain RST/MR with internal pull-up, operation down to VDD = 1V, and immunity to power-supply transients in industrial-temperature systems.

Technical Context

The ISL88031IU8ECZ implements five independent voltage monitors: two factory-preset (VDD and V2MON) and three adjustable via external resistor dividers (V3MON–V5MON), all referenced to a stable 0.600V internal bandgap. Reset assertion occurs when any monitored voltage falls below its trip point, and remains active until all voltages recover and stabilize for ≥120ms.

Its POR circuit initiates reset at power-up when VDD < 1V, and the MR input provides debounced active-low manual reset with 550ns minimum pulse width and 10kΩ internal pull-up. The RST output is open-drain, valid down to VDD = 1V, with VOL ≤ 0.40V while sinking 1.5–2.5mA.

Key Specifications

Pinout & Package

ISL88031IU8ECZ is housed in an 8-lead MSOP package (M8.118), 3.0mm × 3.0mm footprint, 0.65mm pitch, with exposed pad not electrically connected. Pin 1 marked by dot; lead finish is 100% matte tin (RoHS compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT29D3+T and TPS3808G33DBVR, the ISL88031IU8ECZ uniquely integrates five independent monitors - including two factory-set and three adjustable - in one 8-pin MSOP, enabling true five-rail supervision without layout or BOM expansion.

Availability

ISL88031IU8ECZ is available at Aetrix Electronics and suitable for telecom line cards, industrial PLC controllers, enterprise SSD controllers, medical imaging modules, and multi-voltage embedded systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL88031IU8ECZ 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 is a global semiconductor leader specializing in microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT markets.

The ISL88031 family belongs to Renesas' precision voltage supervisor product line, engineered specifically for high-reliability multi-rail power monitoring in telecom, datacom, and industrial computing systems where deterministic reset behavior and low quiescent current are mandatory.

FAQ

What is the exact VDD and V2MON threshold voltage for ISL88031IU8ECZ?

The ISL88031IU8ECZ has a factory-trimmed VDD threshold of 2.866V (±1.8%) and V2MON threshold of 2.333V (±1.8%), both specified over -40°C to +85°C. These values are confirmed in the FN8227 Rev 2.01 datasheet Table "Voltage Thresholds" under the ISL88031IU8ECZ row. No external resistor adjustment is needed for these two inputs - they are fully integrated and calibrated.

Can ISL88031IU8ECZ monitor voltages lower than 2.333V on V3MON, V4MON, or V5MON?

Yes - ISL88031IU8ECZ can monitor voltages as low as 0.600V on V3MON, V4MON, and V5MON using external resistor dividers. The internal reference is 0.600V ±2.2%, so a 1:1 divider on a 1.2V rail yields 0.6V at the pin, triggering reset if the rail drops below ~1.19V. This enables supervision of sub-2V rails like 1.8V, 1.2V, 0.9V, or 0.8V domains without additional ICs.

Does ISL88031IU8ECZ support manual reset, and what are the electrical requirements?

Yes, ISL88031IU8ECZ supports manual reset via the MR pin (Pin 1), an active-low debounced input with a 10kΩ internal pull-up. To assert reset, MR must be pulled to ≤0.8V for ≥550ns. Release of MR initiates a full 120ms reset timeout (tPOR) before RST deasserts - matching the power-on reset timing for consistent system behavior.

What is the maximum supply current draw of ISL88031IU8ECZ, and at what condition is it measured?

The maximum supply current of ISL88031IU8ECZ is 19µA, measured at VDD = 5.0V and +25°C (per FN8227 Rev 2.01 Electrical Specifications table). Typical current is 14µA. This ultra-low quiescent draw holds across the full -40°C to +85°C range, making ISL88031IU8ECZ suitable for always-on supervision in energy-constrained applications such as battery-backed storage or edge AI modules.

Is ISL88031IU8ECZ pin-compatible with other variants in the ISL88031 family, such as ISL88031IU8HFZ?

Yes - all ISL88031 variants, including ISL88031IU8ECZ and ISL88031IU8HFZ, share identical 8-lead MSOP (M8.118) packaging and pinout. The only differences are factory-programmed VTH1 and VTH2 thresholds; V3MON–V5MON functionality, RST/MR behavior, supply current, and timing parameters are identical across the family. This allows drop-in replacement when adjusting monitored rail voltages.