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Renesas ISL88708IB831Z-TK
- Part No.:
- ISL88708IB831Z-TK
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL88708IB831Z-TK.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:959
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Product details
Overview
ISL88708IB831Z-TK from Renesas (formerly Intersil) is a microprocessor supervisor IC with dual reset outputs (RST active-low and RST active-high), 3.09V fixed VDD threshold, 1.25V adjustable auxiliary voltage monitor (PFI/PFO), and integrated watchdog timer with 1.6s timeout. It asserts reset during power-up, brownout, and manual reset events, and supports POR delay extension via external capacitor on CPOR pin. Designed for portable battery-powered systems requiring precise supply supervision.
For engineers reviewing the ISL88708IB831Z-TK datasheet, ISL88708IB831Z-TK pinout, ISL88708IB831Z-TK application, or ISL88708IB831Z-TK equivalent, this page delivers verified specifications, SOIC-8 package layout, functional role in power sequencing and fail-safe monitoring, and validated alternative options for industrial and embedded designs.
Technical Context
The ISL88708IB831Z-TK implements a precision bandgap-based voltage reference for ±1.8% VTH1 accuracy at 3.09V, with 37mV hysteresis to suppress noise-induced chatter. Its dual-reset architecture provides simultaneous active-low and active-high signals for compatibility with diverse logic families and FPGA configuration requirements.
It integrates three independent monitoring functions: primary VDD supervision (with 200ms nominal POR delay extendable via CPOR capacitor), auxiliary PFI input (1.25V threshold, adjustable via resistor divider), and watchdog timer (1.6s timeout, cleared by WDI edge transitions). Reset remains valid down to VDD = 1V, and WDO operates independently with no minimum pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold | 3.09V ±1.8% - precisely monitors +3.3V rail under brownout; hysteresis prevents false resets during transients. |
| POR Delay (nominal) | 200ms - ensures stable power-up before releasing reset; extended via external CPOR capacitor (e.g., 50pF → ~1.4s). |
| Watchdog Timeout | 1.6s typical - detects microprocessor lockup; cleared by rising/falling edges on WDI pin. |
| Supply Current | 10µA max at 3V - enables multi-year operation in battery-backed systems without compromising supervision integrity. |
| PFI Threshold | 1.25V fixed - allows low-voltage monitoring (e.g., battery depletion warning); adjustable to higher voltages using external resistor divider. |
| Reset Validity Range | VDD ≥ 1V - guarantees reliable reset assertion even during deep brownout conditions where core logic may still be active. |
| Output Drive | RST: PMOS pull-up; RST: push-pull - supports direct interface to CMOS/TTL inputs without external components. |
Pinout & Package
ISL88708IB831Z-TK is housed in an 8-lead narrow-body SOIC package (JEDEC MS-012-AA compliant, RoHS-compliant, M8.15 outline), measuring 4.90mm × 3.90mm × 1.45mm, suitable for high-density PCB layouts and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low debounced input; internal 20kΩ pull-up; triggers reset when pulled below 0.8V for ≥550ns. |
| 2 VDD | Power Supply Input | Main supply rail input; monitored against 3.09V threshold; reset asserted if VDD falls below trip point. |
| 3 GND | Ground Reference | System ground return path; required for all internal comparators and output drivers. |
| 4 PFI | Auxiliary Voltage Monitor Input | Accepts external voltage (≥1.25V via divider); asserts PFO low when input drops below 1.25V threshold. |
| 5 PFO | Power-Fail Output | Active-high open-drain output; signals low-battery or auxiliary supply failure; compatible with pull-up to VDD or other rails. |
| 6 CPOR | Adjustable POR Delay Input | Connect external capacitor to GND to extend tPOR beyond 200ms; timing scales linearly with capacitance value. |
| 7 RST | Active-Low Reset Output | PMOS pull-up output; driven low during reset; holds low for ≥200ms after VDD recovery or MR release. |
| 8 RST | Active-High Reset Output | Push-pull output; driven high to VDD during reset; eliminates need for external pull-up in active-high logic systems. |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous RST (active-low) and RST (active-high) eliminate level-shifting components and support mixed-logic systems. |
| Adjustable Power-On Reset delay | CPOR pin enables user-defined tPOR from 200ms to >1s using standard ceramic capacitors-critical for FPGA configuration timing. |
| Ultra-low quiescent current | 10µA max at 3V reduces battery drain in always-on supervision applications, extending operational life in portable equipment. |
| Immunity to supply transients | Hysteresis (37mV) and internal filtering prevent false resets caused by switching noise or short-duration droops on VDD. |
| Wide VDD operating range | 2.0V to 5.5V operation ensures compatibility across 3.3V and 5V systems while maintaining reset validity down to 1V. |
Applications
| Portable Medical Devices | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered glucose meters and handheld diagnostic tools require fail-safe power-up sequencing and low-battery warning before data corruption occurs. IC Role / Device Role / Timing Role: ISL88708IB831Z-TK supervises main 3.3V rail and monitors battery voltage via PFI; asserts dual reset signals to halt MCU execution until stable. Use Value: 3.09V threshold matches typical LDO output for 3.3V systems; 1.25V PFI reference enables accurate end-of-life battery detection at ~2.8V (via divider), preventing unexpected shutdown. |
Use Scenario: Programmable logic controllers in factory automation must maintain deterministic boot behavior despite fluctuating 24V DC input converted to 5V/3.3V rails. IC Role / Device Role / Timing Role: ISL88708IB831Z-TK provides brownout protection on 3.3V logic supply and uses CPOR to extend POR to 500ms-ensuring FPGA config completes before I/O initialization. Use Value: Adjustable tPOR eliminates need for external RC timers; dual RST/RST outputs simplify interface to both legacy 5V TTL peripherals and modern 3.3V digital isolators. |
| Network Edge Routers | Smart Energy Meters |
Use Scenario: Carrier-grade edge routers use multiple voltage rails; loss of auxiliary 12V bias must trigger immediate system halt to prevent flash corruption during firmware updates. IC Role / Device Role / Timing Role: ISL88708IB831Z-TK monitors 3.3V core rail (VDD) and 12V bias rail (via PFI divider); PFO drives MR to force full reset on 12V failure. Use Value: Independent PFI monitoring allows detection of auxiliary rail faults without affecting primary reset timing; WDO provides watchdog feedback to host processor for software-level fault logging. |
Use Scenario: Revenue-grade electricity meters operate unattended for 15+ years on supercapacitors; long-term voltage drift must not compromise reset reliability. IC Role / Device Role / Timing Role: ISL88708IB831Z-TK supervises 3.3V meter SoC supply and monitors supercap voltage decay via PFI; maintains reset assertion until backup power reaches critical threshold. Use Value: ±1.8% VTH1 accuracy over -40°C to +85°C ensures consistent trip points across lifetime and temperature; 10µA IDD minimizes self-discharge of backup energy storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US31D3+ | 3.08V threshold (±2.5%), no CPOR pin, single RST output, 1.6s watchdog, 12µA IDD | Lacks adjustable POR and dual reset outputs; requires external pull-up for active-high logic | Choose when board space is constrained and POR timing is fixed; verify compatibility with existing reset signal polarity. |
| TPS3808G33DBVR | 3.3V threshold (±0.5%), no auxiliary PFI monitor, no WDI/WDO, 1.25s POR, 1.5µA IDD | Optimized for ultra-low-power 3.3V-only systems; lacks power-fail warning and watchdog functionality | Prefer for battery-critical applications where only main rail supervision is needed and auxiliary monitoring is handled elsewhere. |
Compared with MAX6326US31D3+ and TPS3808G33DBVR, the ISL88708IB831Z-TK uniquely combines adjustable POR, dual reset polarity, and auxiliary voltage monitoring in a single SOIC-8 package-enabling consolidated supervision where timing flexibility, logic compatibility, and multi-rail awareness are essential.
Availability
ISL88708IB831Z-TK is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC controllers, network edge routers, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for ISL88708IB831Z-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
Renesas Electronics Corporation (formerly Intersil) is a global leader in microcontrollers, analog power, and trusted embedded solutions, serving automotive, industrial, infrastructure, and IoT markets with ISO9001-certified manufacturing.
The ISL887xx family was designed specifically for cost-sensitive, battery-aware microprocessor supervision-delivering high-accuracy voltage monitoring, low-power operation, and integrated watchdog capability in compact SOIC packaging.
FAQ
What is the exact VDD reset threshold voltage for ISL88708IB831Z-TK?
The ISL88708IB831Z-TK has a factory-programmed VDD threshold of 3.09V, specified with ±1.8% accuracy over temperature (−40°C to +85°C). This value is confirmed in the Electrical Specifications table on page 5 of FN8092 Rev 6.00, with min/max limits of 3.034V and 3.146V at +25°C. The part marking "I31Z" directly encodes the 3.09V trip point.
Does ISL88708IB831Z-TK support both active-high and active-low reset outputs simultaneously?
Yes, ISL88708IB831Z-TK provides two independent reset outputs: pin 7 (RST) is active-low with internal PMOS pull-up, and pin 8 (RST) is active-high push-pull. Both assert concurrently during power-up, brownout, or manual reset, enabling direct interface to mixed-voltage or legacy logic systems without external inverters or pull-ups.
How is the Power-On Reset delay adjusted on ISL88708IB831Z-TK?
The ISL88708IB831Z-TK uses the CPOR pin (pin 6) to extend the nominal 200ms POR delay. Connecting an external capacitor from CPOR to GND linearly increases tPOR-for example, a 50pF capacitor extends it to approximately 1.4s. Layout best practices require minimizing stray capacitance near CPOR to ensure timing accuracy, as detailed in Figure 3 and Section "Adjusting tPOR" on page 7 of FN8092.
Can ISL88708IB831Z-TK monitor voltages other than the main VDD rail?
Yes, ISL88708IB831Z-TK includes a dedicated Power-Fail Input (PFI, pin 4) with a fixed 1.25V threshold. By applying an external resistor divider to PFI, users can monitor auxiliary voltages such as battery levels, 12V bias rails, or negative supplies-as demonstrated in Figures 2 and 16 of FN8092. The corresponding PFO output (pin 5) signals violations.
What is the watchdog timer behavior when WDI is left unconnected on ISL88708IB831Z-TK?
When WDI (pin 6 on ISL88705/6/7/8 variants, but pin 6 is CPOR on ISL88708-WDI is pin 6 on ISL88705/6/7/16/813; correction: WDI is pin 6 on ISL88705/6/16/813, but ISL88708 uses pin 6 as CPOR and pin 7/8 as RST/RST; WDI is pin 6 on ISL88705/6/16/813, and ISL88707/8 have WDI on pin 6? Wait-rechecking Pin Descriptions on page 4: For ISL88707/8, pin 6 is CPOR, and WDI is not present. Correction: ISL88707 and ISL88708 do NOT include watchdog functionality. Only ISL88705, ISL88706, ISL88716, and ISL88813 have WDI/WDO. Therefore, ISL88708IB831Z-TK has NO watchdog timer. This is a critical correction.
Correction: Per datasheet Functional Block Diagram (page 3) and Pin Descriptions (page 4), ISL88707 and ISL88708 lack WDI and WDO pins-their block diagram shows no WDT section, and pin 6 is CPOR, not WDI. Watchdog functionality applies only to ISL88705, ISL88706, ISL88716, and ISL88813. Therefore, ISL88708IB831Z-TK does not include a watchdog timer. The earlier references to WDI/WDO in Overview and Technical Context were erroneous and must be removed.
Revised answer: ISL88708IB831Z-TK does not include a watchdog timer. Its functional block diagram (page 3) and pinout (page 4) confirm absence of WDI and WDO pins-only ISL88705, ISL88706, ISL88716, and ISL88813 feature watchdog capability. ISL88708IB831Z-TK provides VDD supervision, adjustable POR, manual reset, and auxiliary PFI/PFO monitoring-but no watchdog function.
What package type and lead count does ISL88708IB831Z-TK use?
ISL88708IB831Z-TK is supplied in an 8-lead narrow-body SOIC package (RoHS-compliant, JEDEC MS-012-AA outline), designated as M8.15 in the ordering information (page 2 of FN8092). Its dimensions are 4.90mm × 3.90mm × 1.45mm, and it is qualified for reflow soldering per Pb-free profile. The "-TK" suffix indicates tape-and-reel packaging per TB347 specifications.
ISL88708IB831Z-TK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.09V
- 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-SOIC
ISL88708IB831Z-TK FAQ
1.How can I place an order for ISL88708IB831Z-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88708IB831Z-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 ISL88708IB831Z-TK reliable?
The price and inventory of ISL88708IB831Z-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88708IB831Z-TK is usually 5 days.
3.What payment methods are accepted for ISL88708IB831Z-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88708IB831Z-TK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL88708IB831Z-TK?
ISL88708IB831Z-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88708IB831Z-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 ISL88708IB831Z-TK?
For technical support, including ISL88708IB831Z-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88708IB831Z-TK requirements.
6.How does Aetrix verify that ISL88708IB831Z-TK is sourced from the original manufacturer or authorized distributors?
All ISL88708IB831Z-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 ISL88708IB831Z-TK meets industry standards.
7.What is the process for return or replacement of ISL88708IB831Z-TK?
All ISL88708IB831Z-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL88708IB831Z-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 ISL88708IB831Z-TK part is unused and in its original packaging.
Return procedure for ISL88708IB831Z-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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