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Renesas ISL88706IP831Z
- Part No.:
- ISL88706IP831Z
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ISL88706IP831Z.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,319
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Product details
Overview
ISL88706IP831Z from Intersil is a microprocessor supervisor IC designed for power-supply and battery monitoring in embedded systems. It provides fixed 3.09V VDD threshold supervision, active-low manual reset (MR), dual reset outputs (RST and RST), 1.6s watchdog timer, and auxiliary 1.25V PFI/PFO power-fail detection - all with ±1.8% voltage accuracy and 10µA max supply current at 3V. It is used in portable equipment requiring reliable brownout and low-battery warning.
For engineers reviewing the ISL88706IP831Z datasheet, ISL88706IP831Z pinout, ISL88706IP831Z application, or ISL88706IP831Z equivalent, key selection criteria include its 3.09V reset threshold, dual active-high/active-low reset outputs, immunity to power-supply transients, reset assertion down to VDD = 1V, and compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The ISL88706IP831Z integrates a precision bandgap reference, POR circuitry with 200ms nominal tPOR, hysteresis-enhanced VDD comparator (VTH1 = 3.09V ±1.8%), and independent 1.25V PFI threshold detector. Its watchdog timer monitors WDI toggling every ~1.6s and asserts WDO on timeout - but only triggers system reset if WDO is externally connected to MR.
Unlike ISL88707/ISL88708, it lacks CPOR pin and adjustable power-on reset delay; unlike ISL88716/ISL88813, it does not support window-detection mode. It shares identical pinout and core functionality with ISL88705/ISL88706 family members in PDIP-8 package, including internal 20kΩ MR pull-up and reset pulse width ≥140ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold (VTH1) | 3.09V ±1.8% - ensures reset assertion during brownout below 3.034V and release above 3.146V with hysteresis. |
| Supply Current (IDD) | ≤10µA at 3V - enables multi-year operation in battery-backed systems without significant drain. |
| Reset Pulse Width (tPOR) | 140–260ms - guarantees sufficient hold time for microprocessor initialization and FPGA configuration loading. |
| Watchdog Timeout (tWDT) | 1.0–2.0s (typ. 1.6s) - provides robust software hang detection without excessive false triggers. |
| PFI Threshold (VTHPFI) | 1.25V ±50mV - supports external resistor divider for custom low-voltage monitoring (e.g., battery depletion warning). |
| Operating Temperature | –40°C to +85°C - validated for industrial-grade reliability in harsh ambient conditions. |
| Reset Validity Range | VDD ≥1V - maintains functional reset signaling even during deep brownout or partial power collapse. |
Pinout & Package
ISL88706IP831Z is housed in an 8-lead PDIP package (RoHS-compliant, MDP0031 outline), through-hole mountable with 0.300" body width and 0.100" lead pitch. Pin 1 is marked by notch or dot; package is obsolete per manufacturer but remains supported via legacy sourcing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low debounced input with internal 20kΩ pull-up; triggers reset when pulled ≤0.8V for ≥550ns. |
| 2 VDD | Power Supply Input | Main supply rail monitored against 3.09V threshold; reset asserted if VDD drops below 3.034V. |
| 3 GND | Ground Reference | Common return path for all internal comparators, watchdog, and output drivers. |
| 4 PFI | Power-Fail Input | Auxiliary voltage monitor input referenced to 1.25V; used for battery warning or secondary supply detection. |
| 5 PFO | Power-Fail Output | Open-drain output high when PFI >1.25V, low otherwise - enables early power-fail flagging. |
| 6 WDI | Watchdog Input | Edge-sensitive input; toggling clears 1.6s watchdog timer; floating or high-Z disables watchdog function. |
| 7 RST | Active-Low Reset Output | PMOS open-drain output pulled low during reset; sinks up to 2.5mA at VDD ≥3.3V. |
| 8 RST | Active-High Reset Output | Push-pull output driven high to VDD during reset; sources up to 0.8mA at VDD ≥3.3V. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.09V VDD threshold | Enables precise supervision of 3.3V rails with ±1.8% accuracy across –40°C to +85°C, eliminating need for external resistive dividers. |
| Dual RST / RST outputs | Provides simultaneous active-high and active-low reset signals - simplifies interface to mixed-logic systems without level-shifting. |
| 1.25V PFI threshold with hysteresis | Supports reliable low-battery detection down to 1.25V; 20mV hysteresis prevents chatter during slow voltage decay. |
| 10µA max supply current at 3V | Reduces standby power in always-on subsystems - critical for coin-cell or energy-harvesting applications. |
| Immunity to power-supply transients | Internal filtering and hysteresis reject sub-100µs noise spikes, preventing spurious resets in noisy industrial environments. |
Applications
| Battery-Powered Portable Equipment | Notebook/Desktop Power Management |
|---|---|
|
Use Scenario: Monitoring Li-ion battery voltage during discharge to trigger graceful shutdown before cutoff. IC Role / Device Role / Timing Role: ISL88706IP831Z acts as primary brownout supervisor and low-battery warning generator via PFI/PFO. Use Value: Prevents data corruption and flash memory write errors by asserting reset before VDD falls below MCU operational minimum. |
Use Scenario: Ensuring stable boot sequence in x86-based motherboards with multiple regulated rails. IC Role / Device Role / Timing Role: ISL88706IP831Z supervises +3.3V main logic rail and generates synchronized reset to CPU and chipset. Use Value: Guarantees 200ms power-on reset hold time, satisfying Intel's VRD specification for proper clock tree stabilization. |
| Industrial Microcontroller Systems | Communications Equipment Power Sequencing |
|
Use Scenario: Protecting PLC I/O modules from erratic behavior during AC line sags or UPS switchover. IC Role / Device Role / Timing Role: ISL88706IP831Z monitors 3.3V system rail and asserts RST/RST to halt firmware execution until voltage recovers. Use Value: Eliminates need for discrete RC reset circuits while providing tighter threshold tolerance (±1.8% vs. ±5% typical). |
Use Scenario: Coordinating power-up of RF transceiver, baseband processor, and PMIC in cellular base stations. IC Role / Device Role / Timing Role: ISL88706IP831Z serves as central POR generator, with PFO feeding auxiliary reset chain for analog front-end. Use Value: Dual reset outputs allow independent control of digital and analog subsystems, improving signal integrity during startup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL88706IB831Z | Same electrical specs and pinout, but in RoHS-compliant 8-lead SOIC (M8.15) instead of PDIP. | SOIC version supports reflow soldering and higher board density; PDIP preferred for prototyping or wave-soldered legacy assemblies. | Select ISL88706IB831Z for new designs requiring surface-mount assembly and long-term availability. |
| MAX6326UT31D3+ | 3.08V threshold (±2.5%), 1.6µA supply current, no PFI/PFO, single active-low reset output. | Lacks auxiliary voltage monitoring and dual reset outputs; suitable only for basic POR-only use cases. | Choose MAX6326UT31D3+ only when PFI/PFO and RST functionality are unnecessary and ultra-low IDD is prioritized. |
Compared with ISL88706IP831Z, ISL88706IB831Z offers identical supervision performance in a modern SOIC package with better thermal resistance (θJA = 110°C/W vs. 83°C/W), while MAX6326UT31D3+ trades away PFI monitoring and dual reset capability for lower quiescent current - making it viable only in simplified, cost-sensitive POR-only implementations.
Availability
ISL88706IP831Z is available at Aetrix Electronics and suitable for portable electronics, industrial controllers, and communications infrastructure requiring stable component supply despite its discontinued status. Legacy inventory and cross-qualified alternatives ensure continuity for maintenance and repair programs.
Supply support for ISL88706IP831Z 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 is a precision analog and power management semiconductor provider, now part of Renesas Electronics, with expertise in high-reliability supervisors, voltage references, and thermal management ICs.
The ISL88706IP831Z belongs to Intersil's ISL887xx microprocessor supervisor family, engineered for low-power, high-accuracy voltage monitoring in battery-critical and industrial embedded systems where deterministic reset behavior is essential.
FAQ
What is the exact reset voltage threshold for ISL88706IP831Z?
The ISL88706IP831Z has a factory-programmed VDD voltage trip point (VTH1) of 3.09V, with guaranteed limits of 3.034V (min) and 3.146V (max) at +25°C and ±1.8% accuracy over temperature. This threshold is fixed and non-adjustable, optimized for supervision of 3.3V power rails in microprocessor systems.
Does ISL88706IP831Z support adjustable power-on reset delay?
No, ISL88706IP831Z does not support adjustable tPOR. Unlike ISL88707/ISL88708 variants, it lacks the CPOR pin and relies on its fixed 200ms nominal power-on reset timeout (140–260ms range). This is confirmed in the datasheet Functional Block Diagram and Pin Descriptions sections.
Can ISL88706IP831Z monitor both VDD and a secondary voltage simultaneously?
Yes, ISL88706IP831Z monitors VDD against its 3.09V threshold and independently monitors an auxiliary voltage on the PFI pin against a 1.25V internal reference. The PFO output reflects PFI state, enabling concurrent primary rail supervision and low-battery or power-fail detection.
What is the watchdog timer behavior of ISL88706IP831Z?
The ISL88706IP831Z features a 1.6s nominal watchdog timer that clears on any WDI edge transition. If WDI remains static beyond ~2.0s, WDO pulls low. However, WDO alone does not assert RST unless externally wired to MR - ensuring watchdog-triggered reset requires deliberate design intent.
Is ISL88706IP831Z still manufacturable or only available as legacy stock?
ISL88706IP831Z is marked "No longer available" in the official ordering table, with ISL88706IB831Z recommended as its SOIC replacement. Aetrix Electronics maintains verified legacy inventory of ISL88706IP831Z for repair, maintenance, and legacy system support, with full traceability and testing documentation.
ISL88706IP831Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.09V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ISL88706IP831Z FAQ
1.How can I place an order for ISL88706IP831Z through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88706IP831Z 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 ISL88706IP831Z reliable?
The price and inventory of ISL88706IP831Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88706IP831Z is usually 5 days.
3.What payment methods are accepted for ISL88706IP831Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88706IP831Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL88706IP831Z?
ISL88706IP831Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88706IP831Z 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 ISL88706IP831Z?
For technical support, including ISL88706IP831Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88706IP831Z requirements.
6.How does Aetrix verify that ISL88706IP831Z is sourced from the original manufacturer or authorized distributors?
All ISL88706IP831Z 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 ISL88706IP831Z meets industry standards.
7.What is the process for return or replacement of ISL88706IP831Z?
All ISL88706IP831Z units undergo pre-shipment inspection (PSI). If there is an issue with ISL88706IP831Z, 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 ISL88706IP831Z part is unused and in its original packaging.
Return procedure for ISL88706IP831Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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