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Renesas ISL88021IU8FAZ-TK
- Part No.:
- ISL88021IU8FAZ-TK
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ISL88021IU8FAZ-TK.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,074
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Product details
Overview
ISL88021IU8FAZ-TK from Intersil is a triple voltage monitor IC with adjustable power-on-reset, undervoltage monitoring on VDD (3.09V threshold), V2MON (1.69V fixed), and V3MON (UV detection referenced to 0.605V), 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 debounced MR input, and operates from 2.0V to 5.5V supply with only 15µA typical quiescent current.
For engineers reviewing the ISL88021IU8FAZ-TK datasheet, ISL88021IU8FAZ-TK pinout, ISL88021IU8FAZ-TK application, or ISL88021IU8FAZ-TK equivalent, key selection considerations include its UV-only V3MON configuration, MSOP-8 package footprint, 140ms minimum POR delay (adjustable via CPOR capacitor), dual reset output types, and industrial temperature range (-40°C to +85°C) compliance.
Technical Context
The ISL88021IU8FAZ-TK implements independent comparator-based monitoring of three voltage rails: VDD (fixed 3.09V trip), V2MON (fixed 1.69V trip), and V3MON (undervoltage detection against internal 0.605V reference). Reset assertion occurs when any monitored rail falls below its threshold, and remains asserted until all rails stabilize above their thresholds for the full tPOR period.
Its Power-On-Reset circuit activates at VDD > 1V and holds RST low for ≥140ms (configurable up to ~390ms with 10pF CPOR capacitor); the MR input features internal 20kΩ pull-up and 550ns minimum pulse width requirement. Both RST and RST outputs are guaranteed functional down to VDD = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold (VTH1) | 3.09V ±0.056V over -40°C to +85°C - sets primary supply supervision level for microprocessor power rail |
| V2MON Threshold (VTH2) | 1.69V ±0.030V - fixed undervoltage detection point for secondary supply (e.g., I/O or analog rail) |
| V3MON Reference | 0.605V ±0.011V - internal precision reference enabling resistor-divider-based UV monitoring of any rail >0.6V |
| POR Timeout (tPOR) | 140–200ms (CPOR open) - ensures sufficient stabilization time for CPU, oscillator, and FPGA before release |
| Supply Current (IDD1) | 15µA typical at VDD = 5.0V - enables long battery life in portable equipment without sacrificing supervision accuracy |
| Reset Output Drive | RST sinks 2.5mA @ VDD ≥3.3V with VOL ≤0.4V; RST sources 2.5mA with VOH ≥VDD−0.4V - supports direct interface to most µP reset inputs |
| Operating Temp | -40°C to +85°C - qualified for industrial-grade embedded control and instrumentation applications |
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 open-drain input with 20kΩ internal pull-up; asserts reset when pulled <0.8V for ≥550ns |
| 2 VDD | Main Power Supply Input | Supplies internal circuitry; enables POR at >1V and defines VTH1 trip point (3.09V) |
| 3 V2MON | Second Undervoltage Monitor Input | Fixed 1.69V threshold comparator input for secondary supply rail monitoring |
| 4 GND | Analog/Digital Ground Reference | Common return path for all internal comparators, POR timer, and reset drivers |
| 5 V3MON | Adjustable Undervoltage Monitor Input | Compares external resistor-divider voltage to 0.605V reference; detects UV on any rail >0.6V |
| 6 CPOR | Power-On-Reset Timing Capacitor Node | Connects to GND via capacitor (0–50pF) to extend tPOR beyond 140ms baseline |
| 7 RST | Active-Low Open-Drain Reset Output | Drives low during reset; requires external pull-up; compatible with µP /RESET pins |
| 8 RST | Active-High Push-Pull Reset Output | Drives high during normal operation; drives low during reset; no external components needed |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent voltage monitoring | Simultaneous supervision of main supply (VDD), auxiliary rail (V2MON), and user-configurable rail (V3MON) prevents false resets from single-rail transients |
| Adjustable POR timeout | Capacitor-programmable tPOR (140ms–390ms) accommodates diverse oscillator startup and FPGA configuration times without firmware changes |
| Dual reset output types | RST (open-drain) and RST (push-pull) provide hardware flexibility for legacy and modern µP reset interface requirements |
| Low-power operation | 15µA typical supply current enables use in always-on supervisory circuits for battery-backed systems |
| Manual reset with debounce | Integrated MR input debouncing eliminates need for external RC filter or logic, reducing BOM count and board area |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
|
Use Scenario: Supervising 3.3V processor core, 1.8V I/O, and 5V analog subsystems in programmable logic controllers operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Triple voltage monitor asserting synchronized reset across all rails upon any undervoltage event; POR ensures clean boot after power cycling. Use Value: Prevents corrupted state transitions during brownouts by holding µP in reset until all supplies exceed 3.09V, 1.69V, and 0.605V×(R1+R2)/R2 respectively for ≥140ms. |
Use Scenario: Monitoring critical power rails in portable ultrasound or ECG devices where battery voltage sag must trigger immediate safe shutdown. IC Role / Device Role / Timing Role: Primary supervisor for main DC-DC outputs (5V, 3.3V, 2.5V) using VDD, V2MON, and V3MON with resistor dividers. Use Value: 15µA quiescent current extends battery runtime; dual RST/RST outputs simplify interface to both microcontroller and analog front-end ASIC reset domains. |
| Network Edge Routers | Automotive Infotainment ECUs |
|
Use Scenario: Ensuring reliable boot sequencing and runtime supervision of multi-voltage SoC platforms (e.g., 1.1V core, 1.8V memory, 3.3V PHY) in telecom infrastructure gear. IC Role / Device Role / Timing Role: Voltage supervisor providing fail-safe reset generation with manual override capability via front-panel button connected to MR. Use Value: MR debouncing and 550ns pulse rejection prevent spurious resets from switch bounce or ESD events, improving field reliability. |
Use Scenario: Monitoring 5V infotainment head-unit supply, 3.3V MCU rail, and 2.5V display bias voltage under automotive load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Industrial-temperature-rated triple monitor detecting undervoltage on all three rails with hysteresis (37mV/17mV) to reject noise-induced trips. Use Value: VTH1 hysteresis (37mV at 3.09V) and VTH2 hysteresis (17mV at 1.69V) prevent oscillatory reset behavior during slow supply recovery after cranking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US31D3+ | Fixed 3.08V VDD threshold, 1.68V V2MON, same 0.6V V3MON reference; 20µA IDD; no CPOR adjustment | Lacks adjustable POR timing; uses SOT23-6 instead of MSOP-8; single RST output only | Choose when board space is constrained and fixed 140ms POR suffices; verify compatibility with existing RST-only µP interface |
| TPS3808G33DBVR | Single-supply monitor (3.3V only); no V2MON/V3MON inputs; 300ms fixed POR; 1.6µA IDD; push-pull RST only | Monitors only one rail; lacks triple-input architecture and manual reset; optimized for ultra-low-power apps | Select only if supervising a single 3.3V rail with minimal current draw; not suitable as drop-in replacement for ISL88021IU8FAZ-TK's triple-monitor function |
Compared with MAX6326US31D3+ and TPS3808G33DBVR, the ISL88021IU8FAZ-TK uniquely provides three independent monitoring channels with configurable V3MON, dual reset outputs, and capacitor-adjustable POR-enabling robust, flexible supervision in compact multi-rail systems where timing and interface compatibility are critical.
Availability
ISL88021IU8FAZ-TK is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, network edge routers, automotive infotainment ECUs, and portable/battery-powered equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL88021IU8FAZ-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 ISL88021IU8FAZ-TK belongs to Intersil's voltage supervisor product line, engineered specifically for high-reliability embedded systems requiring simultaneous multi-rail monitoring, programmable reset timing, and industrial-temperature operation.
FAQ
What is the exact VDD undervoltage threshold for ISL88021IU8FAZ-TK?
The ISL88021IU8FAZ-TK has a fixed VDD undervoltage threshold of 3.09V, with a tolerance of ±0.056V over the full industrial temperature range (-40°C to +85°C). This value is confirmed in the Electrical Specifications table of FN8226 Rev 1.00, where VTH1 for IU8FAZ variants is specified as 3.029V (min), 3.085V (typ), and 3.141V (max).
Does ISL88021IU8FAZ-TK support overvoltage detection on V3MON?
No, the ISL88021IU8FAZ-TK supports undervoltage (UV) detection only on the V3MON pin. The datasheet explicitly states that ISL88021 devices monitor V3MON for undervoltage conditions, while ISL88022 variants handle overvoltage. This distinction is confirmed in the Ordering Information table and Functional Description section of FN8226.
What is the maximum recommended capacitance for the CPOR pin on ISL88021IU8FAZ-TK?
The maximum recommended capacitance for the CPOR pin on ISL88021IU8FAZ-TK is 50pF, as stated in the Functional Description section of FN8226 Rev 1.00. Exceeding this value may cause timing inaccuracies or violate internal circuit specifications, and the datasheet warns against stray capacitance contributions during PCB layout.
How does the manual reset (MR) input behave on ISL88021IU8FAZ-TK?
The MR input on ISL88021IU8FAZ-TK is an active-low, internally debounced signal with a 20kΩ pull-up resistor. It asserts reset when pulled below 0.8V for at least 550ns. After release, reset remains active for the full tPOR duration (≥140ms), ensuring system-wide synchronization regardless of MR pulse width.
Is ISL88021IU8FAZ-TK RoHS compliant and what packaging option does the "-TK" suffix indicate?
Yes, ISL88021IU8FAZ-TK is RoHS compliant under Intersil's "Pb-Free Plus Anneal" standard, featuring 100% matte tin termination and compatible with both SnPb and Pb-free soldering. The "-TK" suffix denotes tape-and-reel packaging per ordering convention in the FN8226 datasheet's Notes section.
ISL88021IU8FAZ-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:
- 1.69V, 3.085V, 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
ISL88021IU8FAZ-TK FAQ
1.How can I place an order for ISL88021IU8FAZ-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88021IU8FAZ-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 ISL88021IU8FAZ-TK reliable?
The price and inventory of ISL88021IU8FAZ-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88021IU8FAZ-TK is usually 5 days.
3.What payment methods are accepted for ISL88021IU8FAZ-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88021IU8FAZ-TK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL88021IU8FAZ-TK?
ISL88021IU8FAZ-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88021IU8FAZ-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 ISL88021IU8FAZ-TK?
For technical support, including ISL88021IU8FAZ-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88021IU8FAZ-TK requirements.
6.How does Aetrix verify that ISL88021IU8FAZ-TK is sourced from the original manufacturer or authorized distributors?
All ISL88021IU8FAZ-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 ISL88021IU8FAZ-TK meets industry standards.
7.What is the process for return or replacement of ISL88021IU8FAZ-TK?
All ISL88021IU8FAZ-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL88021IU8FAZ-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 ISL88021IU8FAZ-TK part is unused and in its original packaging.
Return procedure for ISL88021IU8FAZ-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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