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Renesas ISL88021IU8FCZ-TK
- Part No.:
- ISL88021IU8FCZ-TK
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ISL88021IU8FCZ-TK.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,744
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Product details
Overview
ISL88021IU8FCZ-TK from Intersil is a triple voltage monitor IC with adjustable power-on-reset, undervoltage monitoring on VDD (3.09V threshold), V2MON (2.32V fixed), and V3MON (UV detection referenced to 0.605V), used in embedded control systems to ensure reliable microprocessor startup and brownout protection.
For engineers reviewing the ISL88021IU8FCZ-TK datasheet, ISL88021IU8FCZ-TK pinout, ISL88021IU8FCZ-TK application, or ISL88021IU8FCZ-TK equivalent, key selection considerations include its dual reset outputs (RST/RST), 140–200ms POR timeout, 20µA quiescent current, MSOP-8 package, and UV-only V3MON configuration distinguishing it from ISL88022 variants.
Technical Context
The ISL88021IU8FCZ-TK implements independent comparator-based monitoring of three supply rails: VDD (fixed 3.09V trip), V2MON (fixed 2.32V trip), and V3MON (adjustable UV threshold via resistor divider against 0.605V internal reference). Reset assertion occurs when any monitored voltage falls below its respective threshold.
Its Power-On-Reset circuit activates at VDD > 1V and holds RST low for a minimum 140ms delay-extendable via external capacitor on CPOR-while RST provides active-high push-pull output. Manual reset (MR) is debounced and internally pulled up to VDD via 20kΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold | 3.09V ±0.056V over -40°C to +85°C - ensures reliable reset during 3.3V rail brownout |
| V2MON Threshold | 2.32V ±0.042V - preset undervoltage detection for secondary supply (e.g., 2.5V domain) |
| V3MON Reference | 0.605V ±0.011V - enables precise UV monitoring of higher voltages via external resistor divider |
| POR Timeout (tPOR) | 140–200ms with CPOR open - guarantees sufficient stabilization time for 3.3V/5V systems before release |
| Supply Current (IDD1) | 15µA typical at VDD = 5.0V - supports ultra-low-power battery-backed monitoring |
| Reset Outputs | RST (open-drain, 0.4V max @ 2.5mA) and RST (push-pull, VOH = VDD−0.4V) - provides interface flexibility with µP and logic |
| Operating Temp | -40°C to +85°C - qualified for industrial embedded environments without derating |
Pinout & Package
ISL88021IU8FCZ-TK is housed in an 8-lead MSOP package (3.0mm × 3.0mm × 1.0mm height, JEDEC MO-187AA compliant) with exposed pad not connected internally; suitable for high-density PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-Low Manual Reset Input | Debounced input with 20kΩ internal pull-up; asserts reset when pulled <0.8V for ≥550ns |
| 2 VDD | Power Supply Input | Primary supply rail (2.0–5.5V); powers internal comparators and reset logic; reset valid down to 1V |
| 3 V2MON | Fixed-Threshold Monitor Input | Accepts secondary supply (e.g., 2.5V); trips at 2.32V ±0.042V for undervoltage detection |
| 4 GND | Ground Reference | Analog and digital ground return; must be low-impedance for accurate threshold referencing |
| 5 V3MON | Adjustable UV Monitor Input | Connects to resistor divider; compares external voltage to 0.605V reference for custom UV trip |
| 6 CPOR | POR Timeout Adjustment | Capacitor-to-ground sets tPOR; 0pF → ~175ms, 50pF max recommended for timing accuracy |
| 7 RST | Active-Low Open-Drain Output | Drives µP RESET# pin; requires external pull-up; sinks 2.5mA max at VDD ≥3.3V |
| 8 RST | Active-High Push-Pull Output | Directly drives logic-level inputs; no external components needed; sources 2.5mA min |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent voltage supervision | Simultaneous monitoring of VDD, V2MON, and V3MON prevents false resets from single-rail transients |
| Adjustable POR timeout via CPOR | External capacitor scales tPOR linearly - enables precise matching to FPGA config or oscillator start-up time |
| Dual reset outputs (RST/RST) | Eliminates need for external level-shifting or inverters when interfacing with mixed-voltage systems |
| 0.605V precision internal reference | Enables <±1% UV threshold accuracy across temperature for V3MON when using matched resistors |
| 20kΩ internal MR pull-up | Reduces BOM count by enabling direct push-button connection without external resistor |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Monitors 3.3V I/O, 2.5V core, and 5V analog supplies in a DIN-rail mounted controller exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Triple supervisor asserting synchronized reset across all domains upon first rail dropout; POR ensures clean boot after AC power recovery. Use Value: Prevents firmware corruption during brownout by holding µP in reset until all rails stabilize for ≥175ms. |
Use Scenario: Ensures safe power sequencing in portable ultrasound equipment with battery-backed real-time clock and ADC reference rails. IC Role / Device Role / Timing Role: VDD monitors main 3.3V system rail, V2MON guards 2.5V sensor interface, V3MON (via divider) checks 1.8V low-noise LDO output. Use Value: Guarantees diagnostic data integrity by disabling signal acquisition if any monitored rail deviates beyond ±3%. |
| Network Edge Router | Automotive Infotainment Head Unit |
Use Scenario: Supervises multi-rail power tree (5V, 3.3V, 1.2V) in fanless enterprise switch operating 24/7 in uncontrolled environments. IC Role / Device Role / Timing Role: Detects gradual 3.3V droop from aging DC-DC converter; MR allows field-service hard reset without power cycle. Use Value: Extends mean time between failures by catching incipient power supply degradation before system lockup. |
Use Scenario: Validates cold-cranking behavior during vehicle ignition, where battery dips to 6V while 3.3V/5V rails must remain stable. IC Role / Device Role / Timing Role: VDD (3.09V) detects 3.3V rail collapse; CPOR set to 30pF extends tPOR to ~280ms to survive cranking transient. Use Value: Avoids head unit reboot during engine start by maintaining reset assertion through 200ms+ voltage dip. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR29D3+ | Fixed 2.93V VDD threshold; no V2MON/V3MON adjustability; single reset output (active-low only) | Lacks dual-rail monitoring and adjustable POR; suited for simpler single-supply systems | Select when only basic 3.3V supervision is required and board space permits larger SOT23-5 package |
| TPS3808G33DBVR | Single-supply monitor (3.3V only); no V2MON/V3MON inputs; 200ms fixed POR; 1.6µA IQ | Cannot replace triple-monitoring function; requires additional ICs for multi-rail coverage | Choose only for cost-sensitive, single-rail designs where ultra-low IQ outweighs functional limitation |
Compared with MAX6326UR29D3+ and TPS3808G33DBVR, the ISL88021IU8FCZ-TK uniquely delivers three independent monitoring channels, dual reset polarity, and capacitor-adjustable POR in an 8-pin MSOP - enabling full system supervision without supplemental components or layout overhead.
Availability
ISL88021IU8FCZ-TK is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, network edge routers, automotive infotainment head units, and portable/battery-powered equipment requiring stable component supply across extended temperature ranges.
Supply support for ISL88021IU8FCZ-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 supervisory, thermal, and interface solutions targeting industrial and embedded markets.
The ISL88021IU8FCZ-TK belongs to Intersil's triple voltage monitor product line, engineered specifically for robust multi-rail power supervision in systems where simultaneous monitoring of primary, secondary, and auxiliary supplies is critical to functional safety.
FAQ
What is the exact VDD undervoltage threshold for ISL88021IU8FCZ-TK?
The ISL88021IU8FCZ-TK has a fixed VDD trip point of 3.09V, with tolerance of ±0.056V over the full -40°C to +85°C operating range. This value is confirmed in the Electrical Specifications table of FN8226 Rev 1.00, where VTH1 for IU8FCZ devices is specified as 3.029V (min), 3.085V (typ), and 3.141V (max). The 3.09V nominal threshold ensures reliable detection of 3.3V rail brownout before microprocessor malfunction.
Does ISL88021IU8FCZ-TK support overvoltage monitoring on V3MON?
No, the ISL88021IU8FCZ-TK supports undervoltage (UV) monitoring only on the V3MON pin. Per the Ordering Information table and Functional Description section of FN8226, ISL88021 variants are designated "UV" for V3MON, whereas ISL88022 variants are "OV". The ISL88021IU8FCZ-TK compares the divided V3MON voltage to a 0.605V internal reference and asserts reset if the monitored voltage falls below that threshold.
How is the Power-On-Reset timeout adjusted on ISL88021IU8FCZ-TK?
The ISL88021IU8FCZ-TK uses the CPOR pin to adjust POR timeout: connecting a capacitor from CPOR to GND increases tPOR linearly relative to the open-circuit baseline (~175ms). The datasheet specifies a maximum recommended capacitance of 50pF; Figure 2 shows normalized tPOR scaling with CPOR value. Stray capacitance must be minimized in layout to maintain timing accuracy, as parasitic C contributes directly to total timing error.
What are the reset output types provided by ISL88021IU8FCZ-TK?
The ISL88021IU8FCZ-TK provides two complementary reset outputs: RST is an active-low open-drain output requiring an external pull-up resistor, while RST is an active-high push-pull output capable of sourcing 2.5mA. This dual-output architecture eliminates the need for external inverters or level shifters when interfacing with processors or logic families having different reset polarity requirements.
Is ISL88021IU8FCZ-TK RoHS compliant and lead-free?
Yes, the ISL88021IU8FCZ-TK is RoHS compliant and offered in a Pb-Free Plus Anneal construction. As stated in the Ordering Information notes, Intersil's Pb-free products use 100% matte tin plate termination finish and meet or exceed IPC/JEDEC J-STD-020 reflow requirements. The "-TK" suffix denotes tape-and-reel packaging compatible with automated SMT assembly.
ISL88021IU8FCZ-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:
- 2.332V, 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
ISL88021IU8FCZ-TK FAQ
1.How can I place an order for ISL88021IU8FCZ-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88021IU8FCZ-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 ISL88021IU8FCZ-TK reliable?
The price and inventory of ISL88021IU8FCZ-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88021IU8FCZ-TK is usually 5 days.
3.What payment methods are accepted for ISL88021IU8FCZ-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88021IU8FCZ-TK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL88021IU8FCZ-TK?
ISL88021IU8FCZ-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88021IU8FCZ-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 ISL88021IU8FCZ-TK?
For technical support, including ISL88021IU8FCZ-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88021IU8FCZ-TK requirements.
6.How does Aetrix verify that ISL88021IU8FCZ-TK is sourced from the original manufacturer or authorized distributors?
All ISL88021IU8FCZ-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 ISL88021IU8FCZ-TK meets industry standards.
7.What is the process for return or replacement of ISL88021IU8FCZ-TK?
All ISL88021IU8FCZ-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL88021IU8FCZ-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 ISL88021IU8FCZ-TK part is unused and in its original packaging.
Return procedure for ISL88021IU8FCZ-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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