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Renesas ISL88031IU8HEZ
- Part No.:
- ISL88031IU8HEZ
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ISL88031IU8HEZ.pdf
- Description:
- IC SUPERVISOR 5 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,952
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Product details
Overview
ISL88031IU8HEZ from Renesas Electronics is a quintuple voltage-monitoring supervisor IC with fixed VDD and V2MON thresholds of 4.634V and 2.955V, ±1.8% threshold accuracy, 120ms nominal reset pulse width, and operation down to VDD = 1V. It monitors five supply rails-including two factory-preset and three adjustable inputs-in an 8-lead MSOP package for telecom, server, and multi-voltage embedded systems.
For engineers reviewing the ISL88031IU8HEZ datasheet, ISL88031IU8HEZ pinout, ISL88031IU8HEZ application, or ISL88031IU8HEZ equivalent, key selection criteria include verified reset timing (tPOR = 80–180ms), open-drain RST/MR interface compatibility, low 19µA max supply current at 5V, and immunity to power-supply transients in industrial temperature range (−40°C to +85°C).
Technical Context
The ISL88031IU8HEZ integrates a precision bandgap reference (0.600V ±1.1% over −40°C to +85°C) shared across three adjustable monitor inputs (V3MON–V5MON), enabling external resistor-divider-based trip-point configuration above 0.6V. Its dual fixed-threshold comparators supervise VDD and V2MON with hysteresis (46mV and 29mV respectively) to prevent chatter during brownouts.
Power-on reset (POR) initiates at VDD ≥ 1V and holds RST asserted for tPOR (80–180ms) until all monitored voltages stabilize above their thresholds. The MR input features internal 10kΩ pull-up and 550ns minimum pulse width, supporting push-button or logic-driven manual reset without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold (VTH1) | 4.634V ±1.8% (−40°C to +85°C); factory-trimmed for precise +5V rail supervision |
| V2MON Threshold (VTH2) | 2.955V ±1.8% (−40°C to +85°C); preset for +3.0V or +3.3V system rail monitoring |
| V3/V4/V5MON Threshold (VREF) | 0.600V ±2.2% (−40°C to +85°C); enables adjustable monitoring of >0.6V supplies via resistor dividers |
| Reset Pulse Width (tPOR) | 120ms nominal (80–180ms range); ensures stable power-up before processor release |
| Supply Current (IDD1) | 19µA max at VDD = 5V; supports ultra-low-power always-on supervision in battery-backed systems |
| RST Output Type | Active-low open-drain; sinks 2.5mA at VDD ≥ 3.3V with VOL ≤ 0.4V; compatible with 1.8V–5V logic interfaces |
| Operating Temp Range | −40°C to +85°C (industrial grade); validated for telecom infrastructure and server motherboard environments |
Pinout & Package
Package: 8-lead MSOP (M8.118), RoHS-compliant, 3.0mm × 3.0mm footprint, 0.65mm pitch, 1.10mm max height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | Debounced, internally pulled up to VDD (10kΩ); triggers full-system reset when pulled below 0.8V for ≥550ns |
| 2 (VDD) | IC bias supply and primary monitor input | Powers device and provides factory-set 4.634V undervoltage detection; reset asserts if VDD < VTH1 |
| 3 (V2MON) | Secondary fixed-threshold monitor input | Dedicated input for 2.955V rail supervision; independent comparator prevents false resets on VDD fluctuations |
| 4 (GND) | Analog/digital ground reference | Common return for all internal comparators and reference circuitry; requires low-impedance PCB connection |
| 5 (V3MON) | Adjustable third monitor input | Accepts divided-down voltage; asserts reset if input falls below 0.600V (±2.2%) |
| 6 (V4MON) | Adjustable fourth monitor input | Independent of V3MON/V5MON; enables simultaneous tracking of three custom supply rails |
| 7 (V5MON) | Adjustable fifth monitor input | Supports low-voltage domain monitoring (e.g., 1.2V, 1.8V) using external resistor network per Equation 1 |
| 8 (RST) | Active-low open-drain reset output | Drives microprocessor / FPGA / ASIC reset line; requires external pull-up to host logic rail (1.8V–5V) |
Key Features
| Feature | Design Value |
|---|---|
| Quintuple independent monitoring | Simultaneous supervision of five distinct supply domains-two fixed, three user-adjustable-reducing BOM count vs. discrete supervisors |
| ±1.8% threshold accuracy | Guaranteed over full industrial temperature range; eliminates need for calibration in telecom/server power sequencing |
| 120ms nominal POR delay | Ensures FPGA configuration, oscillator stabilization, and register initialization complete before system release |
| 19µA max supply current | Enables continuous monitoring in always-on subsystems (e.g., baseband processors, management controllers) without impacting standby power |
| Immunity to supply transients | Internal hysteresis and noise filtering prevent spurious resets during switching regulator ripple or load-step events |
Applications
| Telecom Power Management | Server Motherboard Supervision |
|---|---|
|
Use Scenario: Monitoring +5V, +3.3V, +1.8V, +1.2V, and +0.9V rails in LTE base station power modules. IC Role / Device Role / Timing Role: Quintuple supervisor providing coordinated POR and brownout reset across mixed-voltage ASIC/FPGA/DDR subsystems. Use Value: Single-chip solution replaces five discrete supervisors, reducing PCB area by >60% and eliminating timing skew between rail monitors. |
Use Scenario: Validating power integrity across CPU core, memory, PCIe, BMC, and auxiliary rails in dual-socket x86 servers. IC Role / Device Role / Timing Role: Centralized reset controller asserting RST until all five critical rails exceed thresholds and stabilize for ≥120ms. Use Value: Prevents boot failures caused by marginal VDD or V2MON droop during cold start, improving field reliability in datacenter deployments. |
| Industrial Edge Gateway | Multi-Rail Embedded Controller |
|
Use Scenario: Supervising isolated +24V DC-DC, +5V system, +3.3V I/O, +1.8V PHY, and +1.2V SoC rails in ruggedized IoT gateways. IC Role / Device Role / Timing Role: Fault-tolerant voltage monitor interfacing with watchdog timer and MCU reset pin via open-drain RST. Use Value: Manual reset (MR) enables field-service recovery without power cycle; low IDD1 extends battery backup runtime during AC loss. |
Use Scenario: Ensuring clean startup of ARM Cortex-M7-based motor control board with analog sensor, CAN, USB, and PWM domains. IC Role / Device Role / Timing Role: Supervisor coordinating power sequencing between analog front-end, digital logic, and isolated communication interfaces. Use Value: Adjustable V3MON–V5MON inputs allow precise trip points for non-standard rails (e.g., 2.1V ADC reference, 1.44V CAN transceiver), avoiding overdesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US29D3+T | Quad monitor (not quintuple); fixed 2.93V VCC threshold; 140ms reset timeout; 20µA typical ICC | Lacks fifth monitor channel and adjustable inputs; suitable only where four-rail supervision suffices | Choose when system has ≤4 critical rails and requires Maxim's proven field reliability in harsh environments |
| TPS3808G33DBVR | Single-channel supervisor; 3.3V fixed threshold; 200ms reset timeout; 16µA max IQ; SOT-23-5 package | No multi-rail capability; requires four additional devices to match ISL88031IU8HEZ functionality | Select for cost-sensitive, space-constrained designs needing only one rail monitor with ultra-low quiescent current |
Compared with MAX6326US29D3+T and TPS3808G33DBVR, the ISL88031IU8HEZ delivers integrated quintuple monitoring in one MSOP package-reducing component count, layout complexity, and timing coordination overhead-while maintaining industrial-grade accuracy and transient immunity essential for telecom and server platforms.
Availability
ISL88031IU8HEZ is available at Aetrix Electronics and suitable for telecom infrastructure, server motherboard design, and industrial edge gateway development requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL88031IU8HEZ 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 delivering high-performance, reliable solutions for automotive, industrial, infrastructure, and IoT applications.
The ISL88031 series belongs to Renesas' precision analog supervisor product line, engineered specifically for multi-rail power integrity assurance in mission-critical communications and computing systems.
FAQ
What is the exact reset threshold voltage for VDD on the ISL88031IU8HEZ?
The ISL88031IU8HEZ has a factory-programmed VDD threshold (VTH1) of 4.634V, with guaranteed tolerance of ±1.8% across the full industrial temperature range (−40°C to +85°C). This value is laser-trimmed during production and documented in the FN8227 datasheet Table "VOLTAGE THRESHOLDS" under ISL88031IU8HxZ variants. The ISL88031IU8HEZ uses the same VTH1 as other IU8H-series parts, confirming its suitability for +5V rail supervision.
How does the ISL88031IU8HEZ handle manual reset assertion and release timing?
The ISL88031IU8HEZ asserts RST immediately upon MR falling below 0.8V for ≥550ns, then holds RST low for the full POR timeout period (80–180ms, typically 120ms) after MR returns high. This ensures downstream logic remains held in reset long enough for full system stabilization. The internal 10kΩ MR pull-up eliminates external components, and the debounced input rejects contact bounce from mechanical push-buttons-key behavior confirmed in the "Manual Reset" section of the FN8227 datasheet.
Can the ISL88031IU8HEZ monitor a 1.2V supply, and how is the threshold set?
Yes-the ISL88031IU8HEZ can monitor a 1.2V supply using any of its three adjustable inputs (V3MON, V4MON, or V5MON), which compare against a precise 0.600V internal reference. To monitor 1.2V, connect a resistor divider (e.g., R1 = R2 = 10kΩ) between the 1.2V rail and GND, feeding the midpoint to the chosen VxMON pin. Equation 1 in the FN8227 datasheet confirms VTRIP = 0.6V × (1 + R1/R2), yielding exactly 1.2V trip point. This method is validated for all ISL88031 variants including ISL88031IU8HEZ.
What is the maximum sink current capability of the RST output on the ISL88031IU8HEZ?
The RST output of the ISL88031IU8HEZ is an active-low open-drain driver rated for 2.5mA sink current when VDD ≥ 3.3V, with VOL ≤ 0.4V under that condition. At lower VDD (<3.3V), it sinks 1.5mA while maintaining VOL ≤ 0.4V. This specification is tested and guaranteed per the "RESET" table in FN8227 Rev 2.01, ensuring compatibility with standard 3.3V and 5V logic families without external level-shifting.
Does the ISL88031IU8HEZ require external capacitors for stable operation?
No external capacitors are required for basic supervision functionality of the ISL88031IU8HEZ. Its internal POR circuit and reference generator operate autonomously. However, Renesas recommends 0.1µF ceramic decoupling capacitors placed close to VDD and GND pins to suppress high-frequency noise-especially in noisy switch-mode power supply environments-as stated in the "Special Application Considerations" section of FN8227. These caps improve noise immunity but are not mandatory for datasheet-specified operation.
ISL88031IU8HEZ 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:
- 2.955V, 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
ISL88031IU8HEZ FAQ
1.How can I place an order for ISL88031IU8HEZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88031IU8HEZ 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 ISL88031IU8HEZ reliable?
The price and inventory of ISL88031IU8HEZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88031IU8HEZ is usually 5 days.
3.What payment methods are accepted for ISL88031IU8HEZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88031IU8HEZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL88031IU8HEZ?
ISL88031IU8HEZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88031IU8HEZ 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 ISL88031IU8HEZ?
For technical support, including ISL88031IU8HEZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88031IU8HEZ requirements.
6.How does Aetrix verify that ISL88031IU8HEZ is sourced from the original manufacturer or authorized distributors?
All ISL88031IU8HEZ 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 ISL88031IU8HEZ meets industry standards.
7.What is the process for return or replacement of ISL88031IU8HEZ?
All ISL88031IU8HEZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL88031IU8HEZ, 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 ISL88031IU8HEZ part is unused and in its original packaging.
Return procedure for ISL88031IU8HEZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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