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Renesas ISL88021IU8HFZ
- Part No.:
- ISL88021IU8HFZ
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ISL88021IU8HFZ.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,887
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Product details
Overview
ISL88021IU8HFZ from Intersil is a triple voltage monitor IC with adjustable power-on-reset, undervoltage monitoring on VDD (4.64V threshold), V2MON (3.09V fixed), and V3MON (0.605V internal reference for UV detection), packaged in an 8-lead MSOP. It asserts both active-low open-drain RST and active-high push-pull RST outputs when any monitored supply violates its threshold, enabling reliable microprocessor supervision in multi-rail embedded systems.
For engineers reviewing the ISL88021IU8HFZ datasheet, ISL88021IU8HFZ pinout, ISL88021IU8HFZ application, or ISL88021IU8HFZ equivalent, key selection considerations include its dual reset outputs, 140–200ms POR timeout (adjustable via CPOR capacitor), ±6mV VTH3 accuracy over –40°C to +85°C, 20µA quiescent current, and UV-only V3MON configuration specific to the ISL88021 family.
Technical Context
The ISL88021IU8HFZ implements independent comparator-based monitoring of three rails: VDD (fixed 4.64V trip), V2MON (fixed 3.09V trip), and V3MON (0.605V reference for resistor-divider UV sensing). All thresholds feature built-in hysteresis (46mV on VTH1, 37mV on VTH2) to prevent chatter during slow voltage transitions.
Its POR circuit activates at VDD ≥ 1V and holds RST low for a minimum 140ms delay-extendable up to ~390ms with 10pF on CPOR-while simultaneously validating all three supply voltages before releasing reset. The MR input includes 20kΩ internal pull-up and 550ns minimum pulse width support for debounced manual reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold (VTH1) | 4.64V ±7.4mV (4.565V–4.733V); ensures reliable brownout detection for 5V system rails |
| V2MON Threshold (VTH2) | 3.09V ±56mV (3.034V–3.146V); monitors 3.3V supply with hysteresis for stable release |
| V3MON Reference (VTH3) | 0.605V ±11mV (0.594V–0.616V); enables precise UV monitoring of any rail >0.6V via external resistor divider |
| POR Timeout (tPOR) | 140–200ms (CPOR open); extends to ~390ms with 10pF; guarantees oscillator and FPGA config stability before boot |
| Supply Current (IDD1) | 15µA typical at VDD = 5.0V; supports long battery life in portable equipment |
| Reset Outputs | RST (open-drain, VOL ≤ 0.4V @ 2.5mA) and RST (push-pull, VOH ≥ VDD–0.4V); provides interface flexibility with µP or logic |
| Operating Temp | –40°C to +85°C industrial range; validated for embedded control and process instrumentation environments |
Pinout & Package
Package: 8-lead MSOP (Mini Small Outline Plastic), 3.0mm × 3.0mm body, 0.65mm lead pitch, RoHS-compliant Pb-free plus anneal finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | Debounced input with 20kΩ internal pull-up; triggers full POR sequence when pulled below 0.8V |
| 2 - VDD | Main power supply input | Supplies internal circuitry and enables POR at ≥1V; monitored at 4.64V threshold |
| 3 - V2MON | Second undervoltage monitor input | Fixed 3.09V trip point; used for 3.3V rail supervision without external components |
| 4 - GND | Ground reference | Common return for all analog comparators, POR timing, and reset drivers |
| 5 - V3MON | Adjustable undervoltage monitor input | Compares external resistor-divider output to 0.605V reference; enables custom UV threshold for rails >0.6V |
| 6 - CPOR | Power-on-reset timeout adjustment | Capacitor-to-ground sets tPOR; 0pF → 140ms, 10pF → ~390ms; max 50pF recommended |
| 7 - RST | Active-low open-drain reset output | Drives low during fault or POR; requires external pull-up for logic-level compatibility |
| 8 - RST | Active-high push-pull reset output | Drives high during normal operation; sinks current only during reset assertion |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs (RST/RST) | Enables direct connection to both open-drain–compatible and CMOS-input microcontrollers without level-shifting |
| Triple independent voltage monitoring | Simultaneously supervises primary (VDD), secondary (V2MON), and configurable (V3MON) rails with distinct thresholds and hysteresis |
| Adjustable POR timeout via CPOR | Eliminates need for external RC timing networks; supports design-specific stabilization delays for oscillators and FPGAs |
| 0.605V precision internal reference | Permits accurate UV detection of any supply ≥0.6V using only two external resistors-no trimming required |
| Low 20µA quiescent current | Minimizes standby power impact in battery-backed or energy-sensitive applications such as portable instruments |
Applications
| Industrial Process Controller | Embedded Medical Instrument |
|---|---|
Use Scenario: PLC I/O modules powered by 5V, 3.3V, and 2.5V rails with FPGA configuration and real-time clock backup. IC Role / Device Role / Timing Role: Triple supervisor ensuring all supplies meet thresholds before enabling CPU execution and FPGA startup sequence. Use Value: Prevents corrupted firmware load or register misconfiguration by enforcing 140ms+ POR delay and simultaneous rail validation. |
Use Scenario: Portable blood glucose meter with lithium coin-cell backup, 3.3V MCU core, and 2.5V sensor interface. IC Role / Device Role / Timing Role: Monitors main 3.3V rail (V2MON), backup 2.5V rail (V3MON via divider), and VDD (5V USB charge path). Use Value: Guarantees safe shutdown and data retention when any rail drops below spec-critical for regulatory compliance and patient safety. |
| Communications Baseband Unit | Test & Measurement Equipment |
Use Scenario: Multi-voltage baseband board with 1.8V DSP, 3.3V PHY, and 5V power management ICs. IC Role / Device Role / Timing Role: Detects undervoltage on 3.3V PHY supply (V2MON) and 5V PMIC input (VDD), while V3MON guards 1.8V DSP rail. Use Value: Avoids packet loss or protocol lockup by asserting reset before digital logic enters metastability due to marginal supply conditions. |
Use Scenario: Benchtop oscilloscope with FPGA-based acquisition engine, ADC reference, and display controller-all requiring synchronized power sequencing. IC Role / Device Role / Timing Role: Coordinates POR across 5V analog front-end, 3.3V digital core, and 2.5V reference voltage using single-chip triple monitoring. Use Value: Replaces three discrete supervisors, reducing BOM count, PCB area, and timing skew between reset assertions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple voltage monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369KA29+T | Fixed 2.93V VDD threshold; no V3MON adjustability; only one reset output (active-low) | Lacks dual reset outputs and programmable third monitor; suitable only for simpler dual-rail systems | Select when cost sensitivity outweighs configurability needs and third-rail monitoring is not required |
| TPS3808G33DBVR | Single-supply monitor (3.3V only); no V2MON/V3MON inputs; adjustable POR via external resistor | Cannot supervise multiple rails simultaneously; requires additional ICs for triple monitoring | Choose only for dedicated 3.3V rail supervision where space allows multiple devices |
Compared with MAX6369KA29+T and TPS3808G33DBVR, the ISL88021IU8HFZ uniquely integrates three independent voltage monitors-including a resistor-divider–based UV channel-with dual reset outputs and adjustable POR in a single 8-pin MSOP, eliminating component count and inter-device timing mismatches.
Availability
ISL88021IU8HFZ is available at Aetrix Electronics and suitable for industrial process controllers, embedded medical instruments, communications baseband units, test & measurement equipment, and portable/battery-powered equipment requiring stable component supply and long-term lifecycle support.
Supply support for ISL88021IU8HFZ 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 power management ICs for industrial, computing, and communications markets.
The ISL88021IU8HFZ belongs to Intersil's voltage supervisor product line, engineered specifically for robust, low-power, multi-rail power integrity monitoring in space-constrained embedded systems.
FAQ
What is the VDD undervoltage threshold for ISL88021IU8HFZ?
The ISL88021IU8HFZ has a fixed VDD trip point of 4.64V, specified as 4.565V (min) to 4.733V (max) over –40°C to +85°C. This threshold is factory-trimmed and includes 46mV hysteresis to prevent oscillation during slow voltage recovery. The ISL88021IU8HFZ asserts reset when VDD falls below this value and holds reset until VDD rises above 4.64V + 46mV and remains stable for the full tPOR period.
How does the V3MON pin function on ISL88021IU8HFZ?
The V3MON pin on ISL88021IU8HFZ serves as an undervoltage monitor input referenced to an internal 0.605V bandgap. A resistor divider scales the target supply voltage down to match this reference; when the divided voltage drops below 0.605V, the ISL88021IU8HFZ triggers reset. Unlike VDD and V2MON, V3MON supports custom thresholds for rails >0.6V without external comparators or trimming.
Can ISL88021IU8HFZ be used for overvoltage monitoring?
No-the ISL88021IU8HFZ is configured exclusively for undervoltage monitoring on V3MON, as indicated by "UV" in its ordering information. Its companion part ISL88022IU8HFZ supports overvoltage detection on V3MON. Using ISL88021IU8HFZ for OV would require external circuitry and defeats its integrated comparator architecture; select ISL88022IU8HFZ instead for true OV capability.
What is the maximum recommended capacitance on the CPOR pin of ISL88021IU8HFZ?
The datasheet specifies a maximum recommended capacitance of 50pF on the CPOR pin of ISL88021IU8HFZ. Exceeding this value risks timing inaccuracy due to stray capacitance and may degrade POR consistency. With 10pF installed, tPOR extends to approximately 390ms; with CPOR open, nominal tPOR is 140–200ms. Layout best practice mandates minimizing trace length and avoiding nearby aggressors to preserve timing fidelity.
Does ISL88021IU8HFZ support manual reset functionality?
Yes-ISL88021IU8HFZ includes a dedicated MR (Manual Reset) pin (Pin 1) that accepts an active-low signal to initiate a full POR cycle. The MR input features internal 20kΩ pull-up, 0.8V logic-low threshold, and 550ns minimum pulse width requirement. When asserted, it forces both RST and RST outputs into their reset states for the full tPOR duration, identical to a power-cycle event.
ISL88021IU8HFZ 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:
- 3
- Voltage - Threshold:
- 3.09V, 4.649V, Adj
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
ISL88021IU8HFZ FAQ
1.How can I place an order for ISL88021IU8HFZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88021IU8HFZ 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 ISL88021IU8HFZ reliable?
The price and inventory of ISL88021IU8HFZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88021IU8HFZ is usually 5 days.
3.What payment methods are accepted for ISL88021IU8HFZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88021IU8HFZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL88021IU8HFZ?
ISL88021IU8HFZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88021IU8HFZ 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 ISL88021IU8HFZ?
For technical support, including ISL88021IU8HFZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88021IU8HFZ requirements.
6.How does Aetrix verify that ISL88021IU8HFZ is sourced from the original manufacturer or authorized distributors?
All ISL88021IU8HFZ 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 ISL88021IU8HFZ meets industry standards.
7.What is the process for return or replacement of ISL88021IU8HFZ?
All ISL88021IU8HFZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL88021IU8HFZ, 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 ISL88021IU8HFZ part is unused and in its original packaging.
Return procedure for ISL88021IU8HFZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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