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Renesas ISL88021IU8HEZ-TK
- Part No.:
- ISL88021IU8HEZ-TK
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ISL88021IU8HEZ-TK.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,496
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Product details
Overview
ISL88021IU8HEZ-TK from Intersil is a triple voltage monitor IC with adjustable power-on-reset, undervoltage monitoring on VDD (4.64V threshold), V2MON (2.92V fixed), and V3MON (0.605V internal reference for UV detection), designed for system-level power integrity supervision in embedded control and multi-rail applications.
For engineers reviewing the ISL88021IU8HEZ-TK datasheet, ISL88021IU8HEZ-TK pinout, ISL88021IU8HEZ-TK application, or ISL88021IU8HEZ-TK equivalent, key selection considerations include its dual reset outputs (RST active-low open-drain, RST active-high push-pull), 140–200ms POR timeout (adjustable via CPOR capacitor), ±6mV VTH3 accuracy over -40°C to +85°C, and 20µA quiescent current.
Technical Context
The ISL88021IU8HEZ-TK implements independent comparator-based monitoring of three rails: VDD (fixed 4.64V trip with 46mV hysteresis), V2MON (fixed 2.92V trip), and V3MON (undervoltage detection referenced to 0.605V internal bandgap). Reset assertion occurs if any monitored rail violates its threshold, and remains asserted until all rails stabilize for the full tPOR delay.
Its POR circuit activates when VDD exceeds 1V and holds RST low while timing out via an internal counter; the timeout is extended by connecting a capacitor (≤50pF) to CPOR. The MR input provides debounced manual reset with 20kΩ internal pull-up and 550ns minimum pulse width requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold (VTH1) | 4.64V ±74mV over -40°C to +85°C - ensures reliable reset during brownout of primary supply |
| V2MON Threshold (VTH2) | 2.92V ±53mV - fixed undervoltage detection point for secondary rail (e.g., 3.3V domain) |
| V3MON Reference (VTH3) | 0.605V ±11mV - internal precision reference enabling resistor-divider-based UV monitoring of >0.6V supplies |
| POR Timeout (tPOR) | 140–200ms (CPOR open); scalable with external capacitor - guarantees sufficient stabilization time before processor release |
| Supply Current (IDD1) | 15µA typical at VDD = 5.0V - enables long battery life in portable systems |
| Reset Outputs | RST (open-drain, VOL ≤0.4V @ 2.5mA) and RST (push-pull, VOH ≥VDD−0.4V) - supports mixed-logic interface requirements |
| Operating Temp | -40°C to +85°C - qualified for industrial-grade embedded and control systems |
Pinout & Package
ISL88021IU8HEZ-TK is housed in an 8-lead MSOP package (3.0mm × 3.0mm × 1.0mm height, JEDEC MO-187AA compliant), RoHS-compliant with Pb-free plus anneal termination.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | Debounced input with 20kΩ internal pull-up; asserts reset when pulled below 0.8V for ≥550ns |
| 2 VDD | Main power supply input | Supplies internal circuitry; POR activation begins at VDD > 1V; monitors own rail at 4.64V threshold |
| 3 V2MON | Second undervoltage monitor input | Fixed 2.92V trip point for dedicated rail supervision (e.g., 3.3V I/O supply) |
| 4 GND | Analog/digital ground reference | Common return path for all comparators, POR timer, and reset drivers |
| 5 V3MON | Adjustable undervoltage monitor input | Compares external divided voltage to 0.605V reference; enables custom UV thresholds for >0.6V rails |
| 6 CPOR | Power-on-reset timeout adjustment | Capacitor-to-ground connection extends tPOR beyond 140ms; max 50pF recommended |
| 7 RST | Active-low open-drain reset output | Drives low during reset; requires external pull-up; compatible with 1.8V–5.5V logic families |
| 8 RST | Active-high push-pull reset output | Asserts high during reset; no external components needed; sinks/source up to 2.5mA |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent voltage monitoring | Simultaneous supervision of VDD (4.64V), V2MON (2.92V), and V3MON (UV via 0.605V reference) prevents false resets from single-rail transients |
| Dual reset outputs (RST/RST) | Enables direct interfacing with both open-drain and push-pull microcontroller reset inputs without level-shifting or external logic |
| Adjustable POR timeout (tPOR) | Capacitor-programmable delay (140ms baseline, scalable to >300ms) accommodates slow-ramping FPGAs or crystal oscillators |
| Low-power operation | 15µA typical supply current allows integration into always-on supervisory paths without impacting battery runtime |
| Manual reset with internal pull-up | 20kΩ integrated pull-up eliminates external resistor; simplifies push-button implementation and reduces BOM count |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
|
Use Scenario: Supervises 5V main, 3.3V I/O, and 2.5V core rails in a programmable logic controller operating in factory environments with wide temperature swings. IC Role / Device Role / Timing Role: Triple voltage monitor asserting simultaneous RST/RST upon any rail deviation; POR ensures safe FPGA configuration before CPU boot. Use Value: Prevents erratic operation during line sags or cold starts; 4.64V/2.92V thresholds match standard industrial supply tolerances. |
Use Scenario: Monitors backup battery, main DC-DC output, and analog sensor supply in a portable ultrasound device requiring fail-safe power sequencing. IC Role / Device Role / Timing Role: Detects undervoltage on critical analog rail (via V3MON divider) and triggers coordinated shutdown before data corruption occurs. Use Value: 0.605V internal reference enables precise sub-1V threshold setting; 20µA IDD extends battery life between calibrations. |
| Network Router Baseboard | Automotive Infotainment Head Unit |
|
Use Scenario: Ensures clean startup and continuous supervision of 12V→5V, 5V→3.3V, and 3.3V→1.8V converted rails in a multi-core networking SoC platform. IC Role / Device Role / Timing Role: V2MON and V3MON track intermediate rails; RST output drives SoC nRESET, while RST signals FPGA configuration manager. Use Value: Dual reset outputs eliminate need for external inverters; 140ms+ tPOR covers worst-case power supply ramp times across all converters. |
Use Scenario: Validates stable 5V USB host, 3.3V MCU, and 1.2V DDR supply in an infotainment unit exposed to automotive load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: VDD monitoring detects battery sag below 4.64V; MR input enables service-mode forced reset via diagnostic port. Use Value: -40°C to +85°C rating meets AEC-Q200 ambient requirements; 46mV hysteresis prevents chatter during marginal voltage recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369KA29+T | Fixed 2.93V VDD threshold; no V3MON adjustability; only single RST output; 1.6µA ICC | Lacks third adjustable monitor; suited for simpler two-rail systems where ultra-low current dominates | Select when lowest possible quiescent current is required and third rail monitoring is unnecessary |
| TPS3808G33DBVR | Single-supply monitor (3.3V only); no V2MON/V3MON inputs; adjustable POR delay via resistor; 16µA ICC | Monitors only one rail; requires additional ICs for triple-rail coverage | Choose for cost-sensitive single-rail designs where footprint and BOM count outweigh multi-rail flexibility |
Compared with MAX6369KA29+T and TPS3808G33DBVR, the ISL88021IU8HEZ-TK uniquely delivers three independent monitoring channels-including one resistor-divider-adjustable UV input-in a single 8-pin MSOP, enabling compact, robust power supervision without external components or cascaded devices.
Availability
ISL88021IU8HEZ-TK is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, network router baseboards, automotive infotainment head units, and portable/battery-powered equipment requiring stable component supply and long-term lifecycle support.
Supply support for ISL88021IU8HEZ-TK 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) is a U.S.-based analog and power management IC designer known for high-reliability supervisors, PMICs, and precision analog products serving industrial and embedded markets.
The ISL88021IU8HEZ-TK belongs to Intersil's ISL8802x triple voltage monitor family, engineered specifically for robust, multi-rail power integrity supervision in space-constrained industrial and portable systems where deterministic reset behavior and low quiescent current are critical.
FAQ
What is the exact VDD undervoltage threshold for ISL88021IU8HEZ-TK?
The ISL88021IU8HEZ-TK has a fixed VDD trip point (VTH1) of 4.64V, with a tolerance of ±74mV over the full -40°C to +85°C operating range. This value is confirmed in the Electrical Specifications table of FN8226 Rev 1.00, and applies specifically to the IU8HxZ variant group including ISL88021IU8HEZ-TK.
Does ISL88021IU8HEZ-TK support overvoltage monitoring on V3MON?
No, ISL88021IU8HEZ-TK supports undervoltage monitoring only on V3MON, as indicated by "UV" in the Ordering Information table for all ISL88021 variants. Overvoltage detection on V3MON is exclusive to the ISL88022 family (e.g., ISL88022IU8HEZ). The ISL88021IU8HEZ-TK compares the V3MON input to a 0.605V internal reference and asserts reset when the divided voltage falls below that threshold.
How is the Power-On-Reset timeout adjusted on ISL88021IU8HEZ-TK?
The ISL88021IU8HEZ-TK POR timeout (tPOR) is adjusted by connecting a capacitor between CPOR (Pin 6) and GND. With CPOR open, tPOR is 140–200ms; adding capacitance scales this linearly per Figure 2 in FN8226. The maximum recommended CPOR capacitance is 50pF. Stray PCB capacitance must be minimized to avoid timing error.
What are the reset output types provided by ISL88021IU8HEZ-TK?
The ISL88021IU8HEZ-TK provides two complementary reset outputs: RST is an active-low open-drain output requiring an external pull-up resistor, and RST is an active-high push-pull output capable of sourcing/sinking up to 2.5mA. Both remain asserted for the full tPOR duration after any monitored rail violation or MR activation.
Is ISL88021IU8HEZ-TK RoHS compliant and what packaging does it use?
Yes, ISL88021IU8HEZ-TK is RoHS compliant under the "Pb-Free Plus Anneal" construction, featuring 100% matte tin termination and lead-free molding compounds. It is supplied in tape-and-reel format (denoted by the "-TK" suffix) and housed in an 8-lead MSOP package measuring 3.0mm × 3.0mm × 1.0mm, compliant with JEDEC MO-187AA.
ISL88021IU8HEZ-TK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.947V, 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
ISL88021IU8HEZ-TK FAQ
1.How can I place an order for ISL88021IU8HEZ-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88021IU8HEZ-TK 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 ISL88021IU8HEZ-TK reliable?
The price and inventory of ISL88021IU8HEZ-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88021IU8HEZ-TK is usually 5 days.
3.What payment methods are accepted for ISL88021IU8HEZ-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88021IU8HEZ-TK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL88021IU8HEZ-TK?
ISL88021IU8HEZ-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88021IU8HEZ-TK 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 ISL88021IU8HEZ-TK?
For technical support, including ISL88021IU8HEZ-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88021IU8HEZ-TK requirements.
6.How does Aetrix verify that ISL88021IU8HEZ-TK is sourced from the original manufacturer or authorized distributors?
All ISL88021IU8HEZ-TK 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 ISL88021IU8HEZ-TK meets industry standards.
7.What is the process for return or replacement of ISL88021IU8HEZ-TK?
All ISL88021IU8HEZ-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL88021IU8HEZ-TK, 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 ISL88021IU8HEZ-TK part is unused and in its original packaging.
Return procedure for ISL88021IU8HEZ-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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