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Renesas ISL88031IU8HFZ
- Part No.:
- ISL88031IU8HFZ
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ISL88031IU8HFZ.pdf
- Description:
- IC SUPERVISOR 5 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,581
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Product details
Overview
ISL88031IU8HFZ from Renesas Electronics is a quintuple voltage monitor IC with fixed VDD threshold of 4.634V and fixed V2MON threshold of 3.078V, ±1.8% threshold accuracy, 120ms nominal reset pulse width, and operation down to VDD = 1V. It supervises five power rails in telecom routers and multi-voltage server systems to prevent microprocessor malfunction during brownout.
For engineers reviewing the ISL88031IU8HFZ datasheet, ISL88031IU8HFZ pinout, ISL88031IU8HFZ application, or ISL88031IU8HFZ equivalent, key selection criteria include fixed dual-threshold configuration, adjustable triple-monitor inputs (V3MON–V5MON), open-drain RST/MR interface compatibility, and industrial temperature range support (-40°C to +85°C).
Technical Context
The ISL88031IU8HFZ integrates five independent voltage comparators with factory-trimmed references: one for VDD (4.634V), one for V2MON (3.078V), and three adjustable inputs (V3MON/V4MON/V5MON) referenced to 0.600V internal VREF. All five monitors feed into a wired-OR reset logic block that asserts active-low RST when any input falls below its trip point.
It features Power-On Reset with 80–180ms timeout, manual reset debouncing with 550ns minimum pulse width, and hysteresis (46mV on VTH1, 37mV on VTH2) to suppress noise-induced chatter. The device remains functional with supply as low as 1V and draws only 19µA max at 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold (VTH1) | 4.634V ±1.8% over -40°C to +85°C - ensures reliable reset assertion for +5V rail supervision |
| V2MON Threshold (VTH2) | 3.078V ±1.8% over -40°C to +85°C - matches standard +3.3V supply monitoring |
| VREF for Adjustable Inputs | 0.600V ±2.2% - sets trip point for V3MON/V4MON/V5MON via external resistor dividers |
| Reset Pulse Width (tPOR) | 120ms nominal - guarantees sufficient hold time for processor initialization and FPGA configuration |
| Supply Current (IDD1) | 19µA max at 5V - enables always-on supervision in low-power embedded systems |
| Reset Output Drive | Open-drain, VOL ≤0.4V @ 2.5mA - compatible with 1.8V–5V logic families and pull-up flexibility |
| Operating Temp Range | -40°C to +85°C - qualified for industrial-grade telecom and server applications |
Pinout & Package
ISL88031IU8HFZ is housed in an 8-lead MSOP package (M8.118), 3.0mm × 3.0mm footprint, 0.65mm pitch, RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | Debounced open-drain input with 10kΩ internal pull-up; triggers reset when pulled ≤0.8V for ≥550ns |
| 2 VDD | IC power supply and primary monitor input | Bias source and fixed 4.634V undervoltage detector; RST asserts if VDD < VTH1 or drops below 1V |
| 3 V2MON | Secondary fixed-threshold monitor input | Dedicated +3.3V rail monitor with 3.078V trip point; no external components required |
| 4 GND | Analog/digital ground reference | Common return for all comparators, VREF, and reset logic; must be low-impedance for noise immunity |
| 5 V3MON | Adjustable third monitor input | Accepts divided-down voltage; trips when input < 0.600V - enables custom thresholds >0.6V |
| 6 V4MON | Adjustable fourth monitor input | Same 0.600V reference as V3MON; supports independent rail monitoring with resistor divider |
| 7 V5MON | Adjustable fifth monitor input | Third adjustable input; allows full five-rail coverage including core, I/O, and auxiliary supplies |
| 8 RST | Active-low open-drain reset output | Wired-OR output asserted low if any monitored voltage fails; requires external pull-up resistor |
Key Features
| Feature | Design Value |
|---|---|
| Quintuple monitoring architecture | Simultaneous supervision of five independent rails - eliminates need for multiple discrete supervisors |
| Fixed + adjustable threshold mix | Two factory-set thresholds (VDD/V2MON) plus three user-configurable inputs reduce BOM count and design effort |
| 120ms POR timeout | Guarantees stable power-up sequence for complex processors and FPGAs before release |
| 1V minimum VDD operation | Enables reset assertion during deep brownout conditions where other supervisors fail silently |
| ±1.8% threshold accuracy | Reduces false resets and improves margin for critical +5V/+3.3V rail tolerance compliance |
Applications
| Telecom Router Power Supervision | Server Board Multi-Rail Monitoring |
|---|---|
|
Use Scenario: Monitors +5V, +3.3V, +1.8V, +1.2V, and +0.9V rails on a high-density router line card subject to transient load switching. IC Role / Device Role / Timing Role: Voltage supervisor providing coordinated reset signaling across all domains upon any rail failure. Use Value: Prevents packet corruption and firmware lockup by asserting RST within 6µs of threshold violation and holding for 120ms. |
Use Scenario: Embedded in a dual-CPU server motherboard requiring synchronized reset across CPU core, memory, I/O, and management controller rails. IC Role / Device Role / Timing Role: Centralized reset generator with manual override (MR) for field service and debug. Use Value: Reduces board space vs. five discrete supervisors and ensures deterministic power sequencing via single RST signal. |
| Industrial PLC Controller | Notebook Platform Power Validation |
|
Use Scenario: Used in programmable logic controller backplane to supervise 24V DC input, +5V logic, +3.3V I/O, +2.5V ADC, and +1.8V FPGA rails. IC Role / Device Role / Timing Role: Fault-detection engine interfacing with watchdog timer and safety shutdown circuitry. Use Value: Immunity to power-supply transients prevents spurious resets in electrically noisy factory environments. |
Use Scenario: Integrated into notebook platform design to validate battery-backed +3.3V, main +5V, DDR4 VDDQ, SoC VDDIO, and PMIC enable rails. IC Role / Device Role / Timing Role: System-level power integrity checker enabling BIOS boot validation and thermal throttling coordination. Use Value: Low 19µA quiescent current extends battery life during suspend-to-RAM states without sacrificing supervision fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US46D3+ | Single 4.63V reset IC in SOT23-3; no multi-rail capability, no adjustable inputs, no MR input | Only suitable for basic VDD-only reset; cannot replace quintuple monitoring function | Select only if system requires minimal VDD supervision with ultra-small footprint and no secondary rail monitoring |
| TPS3808G33DBVR | Single 3.3V supervisor with 200ms delay; includes watchdog timer but lacks multi-input architecture | Cannot monitor five rails simultaneously; no VDD/V2MON dual-fixed configuration | Choose when watchdog functionality is prioritized over multi-rail coverage and manual reset is not required |
Compared with MAX6326US46D3+ and TPS3808G33DBVR, the ISL88031IU8HFZ uniquely delivers five-rail supervision in one 8-pin MSOP, combining two fixed thresholds with three adjustable inputs-enabling full system-level power validation without additional ICs or layout overhead.
Availability
ISL88031IU8HFZ is available at Aetrix Electronics and suitable for telecom routers, server motherboards, and industrial PLC controllers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for ISL88031IU8HFZ 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 timing solutions for industrial, automotive, and infrastructure markets.
The ISL88031IU8HFZ belongs to Renesas' precision voltage supervisor product line, engineered for high-reliability multi-rail power monitoring in telecom, datacom, and computing systems where deterministic reset behavior is mission-critical.
FAQ
What is the exact VDD undervoltage threshold for ISL88031IU8HFZ?
The ISL88031IU8HFZ has a factory-programmed VDD threshold (VTH1) of 4.634V, with ±1.8% accuracy over the full -40°C to +85°C operating range. This value is confirmed in the Ordering Information table on page 2 of FN8227 Rev 2.01 and verified in the Electrical Specifications table on page 4. The ISL88031IU8HFZ uses this precise trip point to supervise +5V power rails without external resistor networks.
Does ISL88031IU8HFZ support manual reset, and how is it implemented?
Yes, ISL88031IU8HFZ supports manual reset via the MR pin (Pin 1), an active-low open-drain input with internal 10kΩ pull-up. A push-button or control signal pulling MR ≤0.8V for ≥550ns initiates reset assertion. After release, RST remains low for the full tPOR period (80–180ms). This feature is documented in the Pin Descriptions section (page 2) and Principles of Operation (page 6) of the ISL88031IU8HFZ datasheet.
Can ISL88031IU8HFZ monitor voltages higher than 5.5V?
No, ISL88031IU8HFZ cannot directly monitor voltages above 5.5V. Its absolute maximum rating for any pin is +7V, but the recommended supply voltage range is 2.0V to 5.5V. For rails exceeding 5.5V (e.g., 12V or 24V), external resistor dividers must scale the input down to ≤5.5V before connecting to V2MON, V3MON, V4MON, or V5MON. VDD itself must remain within 2.0–5.5V per the Recommended Operating Conditions table (page 4).
What is the reset output type and drive capability of ISL88031IU8HFZ?
The ISL88031IU8HFZ features an active-low open-drain RST output (Pin 8) capable of sinking up to 2.5mA while maintaining VOL ≤0.4V when VDD ≥3.3V. This configuration allows flexible pull-up to any logic rail (1.8V, 3.3V, or 5V) and supports wired-OR reset bus architectures. The specification is explicitly stated in the Electrical Specifications table under "RESET VOL" on page 5 of the ISL88031IU8HFZ datasheet.
How does ISL88031IU8HFZ handle temperature variation across its operating range?
The ISL88031IU8HFZ maintains specified threshold accuracy across -40°C to +85°C: VTH1 varies from 4.453V (min) to 4.815V (max), and VTH2 from 2.958V to 3.198V, both with ±1.8% typical deviation centered at 4.634V and 3.078V respectively. Hysteresis (46mV on VTH1, 37mV on VTH2) further stabilizes operation against thermal noise. These values are fully characterized and published in the Electrical Specifications tables on pages 4–5 of FN8227 Rev 2.01.
ISL88031IU8HFZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 5
- Voltage - Threshold:
- 3.078V, 4.634V, Adj, Adj, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 80ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
ISL88031IU8HFZ FAQ
1.How can I place an order for ISL88031IU8HFZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88031IU8HFZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL88031IU8HFZ reliable?
The price and inventory of ISL88031IU8HFZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88031IU8HFZ is usually 5 days.
3.What payment methods are accepted for ISL88031IU8HFZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88031IU8HFZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL88031IU8HFZ?
ISL88031IU8HFZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88031IU8HFZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL88031IU8HFZ?
For technical support, including ISL88031IU8HFZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88031IU8HFZ requirements.
6.How does Aetrix verify that ISL88031IU8HFZ is sourced from the original manufacturer or authorized distributors?
All ISL88031IU8HFZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL88031IU8HFZ meets industry standards.
7.What is the process for return or replacement of ISL88031IU8HFZ?
All ISL88031IU8HFZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL88031IU8HFZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL88031IU8HFZ part is unused and in its original packaging.
Return procedure for ISL88031IU8HFZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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