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Renesas ISL88021IU8HFZ-TK
- Part No.:
- ISL88021IU8HFZ-TK
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ISL88021IU8HFZ-TK.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,675
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Product details
Overview
ISL88021IU8HFZ-TK 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), designed for reliable system reset assertion in multi-rail embedded systems. It delivers active-low open-drain RST and active-high push-pull RST outputs, supports manual reset via MR pin, and operates from 2.0V to 5.5V supply with 15µA typical quiescent current.
For engineers reviewing the ISL88021IU8HFZ-TK datasheet, ISL88021IU8HFZ-TK pinout, ISL88021IU8HFZ-TK application, or ISL88021IU8HFZ-TK equivalent, key selection considerations include its 4.64V/3.09V dual fixed thresholds, UV-only V3MON capability, 140–200ms POR timeout (adjustable via CPOR capacitor), -40°C to +85°C industrial temperature range, and 8-lead MSOP package compatibility with space-constrained PCB layouts.
Technical Context
The ISL88021IU8HFZ-TK implements independent comparator-based monitoring of three voltage rails: VDD (fixed 4.64V trip), V2MON (fixed 3.09V trip), and V3MON (0.605V reference for resistor-divider-based undervoltage detection). Reset assertion occurs if any monitored rail falls below its threshold, with hysteresis (46mV on VDD, 37mV on V2MON) preventing chatter during slow transitions.
Its Power-On-Reset circuit activates when VDD exceeds 1V, holding RST low for ≥140ms (configurable up to ~390ms with 10pF CPOR capacitor); both RST and RST outputs are synchronized to this timeout. The MR input features internal 20kΩ pull-up and 550ns minimum pulse width support for debounced manual reset initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold (VTH1) | 4.649V (±8.4mV over -40°C to +85°C); ensures reliable reset during 5V rail brownout |
| V2MON Threshold (VTH2) | 3.090V (±56mV); monitors 3.3V supply compliance with 37mV hysteresis |
| V3MON Reference (VTH3) | 0.605V ±11mV; enables precise UV detection of >0.6V rails via external resistor divider |
| POR Timeout (tPOR) | 140–200ms (CPOR open); extends to ~390ms with 10pF capacitor-sufficient for FPGA configuration |
| Supply Current (IDD1) | 15µA at VDD = 5.0V; enables long battery life in portable equipment |
| Reset Output Drive | RST sinks 2.5mA @ VDD ≥ 3.3V (VOL ≤ 0.4V); RST sources 2.5mA (VOH ≥ VDD−0.4V) |
| Operating Temp | -40°C to +85°C; qualified for industrial embedded control and process instrumentation |
Pinout & Package
Package: 8-lead MSOP (Mini Small Outline Plastic), 3.0mm × 3.0mm body, 0.65mm 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; asserts reset when pulled <100mV for ≥1µs |
| 2 VDD | Main power supply input | Supplies internal circuitry; POR initiates at VDD > 1V; valid reset operation down to VDD = 1V |
| 3 V2MON | Second undervoltage monitor input | Fixed 3.09V threshold; compares against 3.3V rail-no external components required |
| 4 GND | Ground reference | Common return path for all analog comparators and digital logic; must be low-impedance |
| 5 V3MON | Adjustable undervoltage monitor input | Compares external divided voltage to 0.605V reference; enables custom UV detection for 2.5V/1.8V rails |
| 6 CPOR | Power-on-reset timeout delay control | Capacitor-to-ground sets tPOR; 0pF → 140–200ms; 10pF → ~390ms; max 50pF recommended |
| 7 RST | Active-low open-drain reset output | Drives microcontroller /RESET pin; requires external pull-up; sinks 2.5mA min |
| 8 RST | Active-high push-pull reset output | Directly drives logic-level enable inputs; no external components needed |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent voltage monitoring | Simultaneous supervision of VDD (5V), V2MON (3.3V), and V3MON (custom rail) prevents single-point failure |
| Adjustable POR timeout | CPOR pin allows fine-tuning of reset hold time to match FPGA boot, oscillator stabilization, or flash programming delays |
| Dual reset outputs (RST/RST) | Supports legacy active-low microcontrollers and modern active-high peripherals without level-shifting |
| Manual reset with internal pull-up | Eliminates external resistor; push-button interface requires only MR-to-GND connection |
| Low 15µA quiescent current | Minimizes standby power draw in battery-backed systems and portable instrumentation |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
|
Use Scenario: Monitors 5V main supply, 3.3V I/O rail, and 2.5V ADC reference in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Triple supervisor asserting synchronized RST/RST upon any rail undervoltage to prevent corrupted ladder logic execution or I/O misreads. Use Value: Prevents spurious relay actuation or sensor data corruption during brownout by enforcing ≥140ms reset hold until all rails stabilize. |
Use Scenario: Ensures safe power sequencing in a portable ultrasound device with 5V analog front-end, 3.3V digital core, and 1.8V FPGA configuration voltage. IC Role / Device Role / Timing Role: Detects undervoltage on all three rails using VDD, V2MON, and resistor-divided V3MON; triggers hardware reset before signal processing begins. Use Value: Guarantees clean startup after battery insertion or charger connection by holding processor in reset until all analog/digital domains meet spec. |
| Network Router Management Card | Automotive Infotainment Head Unit |
|
Use Scenario: Supervises auxiliary 5V, 3.3V management MCU supply, and 1.2V DDR termination voltage in a carrier-grade router's control plane card. IC Role / Device Role / Timing Role: Provides fail-safe reset coordination across heterogeneous power domains; MR pin enables remote watchdog-triggered recovery. Use Value: Eliminates need for discrete supervisors per rail-reduces BOM count and improves MTBF in telecom infrastructure. |
Use Scenario: Monitors 5V infotainment main, 3.3V display interface, and 2.5V audio codec supply in an automotive head unit subjected to cold-crank transients. IC Role / Device Role / Timing Role: Detects VDD sag below 4.565V and V2MON drop below 3.034V during engine start; asserts reset to avoid GUI freeze or audio artifacts. Use Value: Maintains functional safety by enforcing reset during ISO 16750-2 Pulse 4 events, meeting ASIL-B readiness requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple voltage monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6361KA29D3+T | Fixed 2.93V VDD threshold; no V2MON/V3MON flexibility; only single reset output (active-low) | Limited to dual-rail monitoring; lacks adjustable POR and dual-output drive capability | Select when only basic 3V system supervision is needed and board space permits larger SOT23-6 package |
| TPS3808G33DBVR | Single-supply monitor (3.3V only); no V2MON/V3MON inputs; fixed 3.08V threshold; no manual reset input | Cannot supervise multiple rails simultaneously; no MR or CPOR adjustability | Choose only for simple 3.3V-only applications where cost is primary and feature set is secondary |
Compared with MAX6361KA29D3+T and TPS3808G33DBVR, the ISL88021IU8HFZ-TK uniquely supports three independent rails, dual reset polarity, manual reset with internal pull-up, and POR timeout adjustment-making it suitable for complex multi-voltage embedded systems requiring high reliability and design flexibility.
Availability
ISL88021IU8HFZ-TK is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, network router management cards, automotive infotainment head units, and portable/battery-powered equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL88021IU8HFZ-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 semiconductor company specializing in precision analog, power management, and interface ICs for industrial, computing, and communications markets.
The ISL88021IU8HFZ-TK belongs to Intersil's voltage supervisor product line, engineered specifically for robust, multi-rail power integrity monitoring in mission-critical embedded systems where deterministic reset behavior and long-term supply stability are essential.
FAQ
What is the exact VDD undervoltage threshold for ISL88021IU8HFZ-TK?
The ISL88021IU8HFZ-TK has a fixed VDD trip point (VTH1) of 4.649V (typical), with a guaranteed range of 4.565V to 4.733V over -40°C to +85°C. This threshold is factory-trimmed and applies specifically to the IU8HFZ variant, which uses the "H" VDD threshold option (4.64V nominal) as confirmed in the FN8226 datasheet ordering table.
Does ISL88021IU8HFZ-TK support overvoltage monitoring on V3MON?
No, the ISL88021IU8HFZ-TK supports undervoltage (UV) monitoring only on V3MON, as indicated by its part number suffix "HFZ" and the datasheet designation "UV" under V3MON TYPE in the ordering table. The ISL88022 variant is required for overvoltage monitoring on V3MON; ISL88021IU8HFZ-TK compares the V3MON input to a 0.605V internal reference to detect drops below user-defined thresholds.
How is the Power-On-Reset timeout adjusted on ISL88021IU8HFZ-TK?
The ISL88021IU8HFZ-TK POR timeout (tPOR) is adjusted by connecting a capacitor between CPOR (Pin 6) and GND. With CPOR open, tPOR is 140–200ms; adding 10pF extends it to ~390ms. The datasheet specifies a maximum recommended CPOR capacitance of 50pF and warns that stray PCB capacitance must be minimized to avoid timing error.
What are the reset output types provided by ISL88021IU8HFZ-TK?
The ISL88021IU8HFZ-TK provides two complementary reset outputs: RST (Pin 7) is an active-low open-drain output requiring an external pull-up resistor, and RST (Pin 8) is an active-high push-pull output capable of sourcing 2.5mA. Both outputs are asserted simultaneously after the POR timeout and remain active until all monitored voltages meet their thresholds.
Is ISL88021IU8HFZ-TK compatible with lead-free reflow processes?
Yes, the ISL88021IU8HFZ-TK is offered in a Pb-Free Plus Anneal version (RoHS compliant), featuring 100% matte tin plate termination finish and materials qualified for both SnPb and Pb-free soldering. Its MSL rating meets or exceeds IPC/JEDEC J-STD-020 requirements for peak reflow temperatures up to 260°C.
ISL88021IU8HFZ-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:
- 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-TK FAQ
1.How can I place an order for ISL88021IU8HFZ-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88021IU8HFZ-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 ISL88021IU8HFZ-TK reliable?
The price and inventory of ISL88021IU8HFZ-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88021IU8HFZ-TK is usually 5 days.
3.What payment methods are accepted for ISL88021IU8HFZ-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88021IU8HFZ-TK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL88021IU8HFZ-TK?
ISL88021IU8HFZ-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88021IU8HFZ-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 ISL88021IU8HFZ-TK?
For technical support, including ISL88021IU8HFZ-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88021IU8HFZ-TK requirements.
6.How does Aetrix verify that ISL88021IU8HFZ-TK is sourced from the original manufacturer or authorized distributors?
All ISL88021IU8HFZ-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 ISL88021IU8HFZ-TK meets industry standards.
7.What is the process for return or replacement of ISL88021IU8HFZ-TK?
All ISL88021IU8HFZ-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL88021IU8HFZ-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 ISL88021IU8HFZ-TK part is unused and in its original packaging.
Return procedure for ISL88021IU8HFZ-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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