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Renesas ISL88708IP831Z
- Part No.:
- ISL88708IP831Z
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ISL88708IP831Z.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,729
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Product details
Overview
ISL88708IP831Z from Intersil is a microprocessor supervisor IC with fixed 3.09V VDD voltage threshold, dual active-high/active-low reset outputs (RST/RST), adjustable power-on reset timeout via CPOR pin, 1.25V auxiliary power-fail monitor (PFI/PFO), and 1.6s watchdog timer. It operates from 2.0V to 5.5V supply, draws ≤10µA at 3V, and asserts reset down to VDD = 1V - used in battery-powered embedded systems for reliable power-up sequencing and brownout protection.
For engineers reviewing the ISL88708IP831Z datasheet, ISL88708IP831Z pinout, ISL88708IP831Z application, or ISL88708IP831Z equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in FN8092 Rev 6.00 and official ordering data for ISL88708IP831Z.
Technical Context
The ISL88708IP831Z implements a precision voltage supervision architecture with ±1.8% VTH1 accuracy at 3.09V, hysteresis of 37mV, and immunity to power-supply transients. Its dual-reset outputs (push-pull RST and PMOS-open-drain RST) support both logic-level and rail-referenced reset signaling in mixed-voltage systems.
It integrates three independent monitoring paths: primary VDD supervision with 200ms nominal tPOR (extendable via external CPOR capacitor), auxiliary PFI input with 1.25V threshold for low-battery warning or power-fail detection, and a 1.6s watchdog timer cleared by WDI edge transitions - all operating with ultra-low 10µA supply current at 3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold (VTH1) | 3.09V ±1.8% - factory-trimmed trip point ensures accurate +3.3V rail monitoring without external resistors. |
| Supply Current (IDD) | ≤10µA at 3V - enables multi-year operation in coin-cell–powered portable equipment. |
| Reset Pulse Width (tPOR) | 140–260ms (nominal 200ms), extendable via CPOR capacitor - guarantees stable MCU initialization before release. |
| PFI Threshold | 1.25V ±50mV - supports configurable low-battery detection using external resistor divider. |
| Watchdog Timeout (tWDT) | 1.0–2.0s (typical 1.6s) - provides robust firmware hang detection without requiring precise timing margins. |
| Operating Temp Range | −40°C to +85°C - qualified for industrial-grade embedded applications including controllers and instrumentation. |
| Reset Valid Down To | VDD = 1V - maintains functional reset assertion during deep brownout conditions. |
Pinout & Package
ISL88708IP831Z is housed in an 8-lead PDIP package (RoHS-compliant, MDP0031 outline), through-hole mountable, wave-solder compatible only - not suitable for reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low debounced input with 20kΩ internal pull-up; triggers reset when pulled below 0.8V for ≥550ns. |
| 2 VDD | Main Power Supply Input | Monitored rail input; reset asserted when voltage falls below 3.09V threshold with 37mV hysteresis. |
| 3 GND | Ground Reference | Common return path for all internal comparators, watchdog, and output drivers. |
| 4 PFI | Auxiliary Voltage Monitor Input | Accepts external voltage (e.g., battery or secondary rail); asserts PFO low when input <1.25V. |
| 5 PFO | Power-Fail Output | Active-high open-drain output; signals low-battery or power-fail condition to host controller or enable circuit. |
| 6 CPOR | Adjustable POR Time-Out Delay Input | Capacitor-to-ground connection extends tPOR beyond 200ms - e.g., 50pF yields ~1.4s delay. |
| 7 RST | Active-Low Reset Output | PMOS open-drain output pulled low during reset; requires external pull-up for logic-level compatibility. |
| 8 RST | Active-High Reset Output | Push-pull output driven high to VDD during reset; eliminates need for external pull-up in 3.3V/5V systems. |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | RST (active-low, open-drain) and RST (active-high, push-pull) enable direct interface with diverse MCU reset inputs without level-shifting. |
| Adjustable power-on reset timeout | CPOR pin accepts external capacitor to scale tPOR from 200ms to >1s - supports FPGA configuration or slow-ramping supplies. |
| Ultra-low quiescent current | 10µA max at 3V allows integration into always-on battery backup circuits without significant drain. |
| 1.25V auxiliary voltage monitor | PFI/PFO pair detects low battery or auxiliary rail failure with user-adjustable threshold via resistor divider (down to 1.25V). |
| Watchdog timer with edge-triggered clear | 1.6s timeout cleared on any WDI rising/falling edge - tolerates jittered or irregular firmware heartbeat signals. |
Applications
| Battery-Powered Portable Equipment | Notebook/Desktop Power Management |
|---|---|
Use Scenario: Coin-cell–backed real-time clock (RTC) module with system wake-on-power-loss detection. IC Role / Device Role / Timing Role: ISL88708IP831Z monitors main 3.3V rail and battery voltage via PFI to assert RST on brownout and PFO on low battery. Use Value: Prevents RTC corruption during power transition and enables graceful shutdown before battery depletion. |
Use Scenario: Desktop motherboard power-good sequencing for CPU and chipset rails. IC Role / Device Role / Timing Role: ISL88708IP831Z supervises +3.3V standby rail and uses CPOR to delay reset until +12V and +5V stabilize. Use Value: Eliminates need for discrete RC timing network while ensuring synchronized release across multiple voltage domains. |
| Industrial Microcontroller Systems | Communications Equipment Monitoring |
Use Scenario: PLC I/O module with watchdog-protected firmware and dual-rail monitoring. IC Role / Device Role / Timing Role: ISL88708IP831Z asserts RST on 3.3V undervoltage and feeds WDI with periodic UART TX activity; WDO tied to MR for automatic recovery. Use Value: Guarantees deterministic restart after firmware lockup without manual intervention or external logic. |
Use Scenario: Optical line terminal (OLT) with +3.3V core supply and −48V DC feed monitoring. IC Role / Device Role / Timing Role: ISL88708IP831Z uses PFI with resistor divider to detect −48V presence; PFO drives MR to hold system in reset if feed fails. Use Value: Enables safe power-down sequence and prevents erroneous operation during telecom power interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL88708IB831Z | Same electrical specs and pinout, but SOIC-8 (M8.15) package instead of PDIP-8. | Surface-mount assembly; higher thermal resistance (θJA = 110°C/W vs. 83°C/W for PDIP). | Select ISL88708IB831Z for automated SMT production; ISL88708IP831Z remains valid for through-hole prototyping or legacy wave-solder lines. |
| MAX6326UT31D3+ | 3.08V threshold (±2.5%), no CPOR adjustability, single RST output, 1.6µA IDD at 3V. | Lacks dual-reset outputs and programmable tPOR; optimized for ultra-low-power static monitoring only. | Choose MAX6326UT31D3+ where minimal current draw dominates over flexibility; retain ISL88708IP831Z when adjustable timing or complementary reset signaling is required. |
Compared with ISL88708IB831Z and MAX6326UT31D3+, the ISL88708IP831Z uniquely combines through-hole PDIP packaging, field-adjustable POR delay, and dual RST/RST outputs - making it optimal for industrial designs needing mechanical robustness, timing customization, and mixed-voltage reset interfacing.
Availability
ISL88708IP831Z is available at Aetrix Electronics and suitable for industrial controllers, portable instrumentation, and communications equipment requiring stable component supply with long-term lifecycle support.
Supply support for ISL88708IP831Z 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 specialist, now part of Renesas Electronics, delivering high-reliability ICs for industrial, infrastructure, and computing markets.
The ISL88708IP831Z belongs to Intersil's microprocessor supervisor family, designed specifically for cost-sensitive, low-power embedded systems requiring accurate voltage monitoring, flexible reset control, and watchdog safety features.
FAQ
What is the exact voltage threshold and accuracy of the ISL88708IP831Z?
The ISL88708IP831Z has a factory-programmed VDD voltage trip point of 3.09V with ±1.8% accuracy over temperature (−40°C to +85°C), as specified in FN8092 Rev 6.00 Table on page 5. This value is confirmed in the Ordering Information table where "I31Z" suffix denotes 3.09V. The device also provides 37mV hysteresis to prevent chatter during threshold crossings.
Does the ISL88708IP831Z support adjustable power-on reset timeout?
Yes, the ISL88708IP831Z supports adjustable tPOR via the CPOR pin. Connecting an external capacitor from CPOR to ground extends the nominal 200ms reset timeout - for example, a 50pF capacitor increases tPOR to approximately 1.4s. This feature is explicitly enabled on ISL88707 and ISL88708 variants per Figure 3 and page 7 of FN8092.
What are the key differences between ISL88708IP831Z and ISL88708IB831Z?
The ISL88708IP831Z and ISL88708IB831Z share identical electrical specifications and pin functions, but differ in package: IP831Z uses 8-lead PDIP (MDP0031), while IB831Z uses 8-lead SOIC (M8.15). PDIP supports wave soldering only; SOIC is surface-mount compatible. Both are RoHS-compliant and operate across −40°C to +85°C.
Can the ISL88708IP831Z monitor voltages other than VDD?
Yes, the ISL88708IP831Z includes a dedicated PFI (Power-Fail Input) pin with a 1.25V internal reference. By connecting an external resistor divider to PFI, users can monitor auxiliary voltages such as battery levels or secondary rails - for instance, detecting a 2.5V battery drop to 2.0V using a 1:1 divider. PFO then signals the condition as a logic-high output.
Is the watchdog timer in ISL88708IP831Z enabled by default?
No, the watchdog timer in ISL88708IP831Z is disabled when WDI is left floating or connected to a high-impedance state. It activates only when WDI receives periodic edge transitions (rising or falling) within the 1.6s timeout window. This behavior is documented on page 4 (Pin Descriptions) and page 8 (Principles of Operation) of FN8092 Rev 6.00.
ISL88708IP831Z 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, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ISL88708IP831Z FAQ
1.How can I place an order for ISL88708IP831Z through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88708IP831Z 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 ISL88708IP831Z reliable?
The price and inventory of ISL88708IP831Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88708IP831Z is usually 5 days.
3.What payment methods are accepted for ISL88708IP831Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88708IP831Z transactions.
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4.How is shipping managed for ISL88708IP831Z?
ISL88708IP831Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88708IP831Z 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 ISL88708IP831Z?
For technical support, including ISL88708IP831Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88708IP831Z requirements.
6.How does Aetrix verify that ISL88708IP831Z is sourced from the original manufacturer or authorized distributors?
All ISL88708IP831Z 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 ISL88708IP831Z meets industry standards.
7.What is the process for return or replacement of ISL88708IP831Z?
All ISL88708IP831Z units undergo pre-shipment inspection (PSI). If there is an issue with ISL88708IP831Z, 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 ISL88708IP831Z part is unused and in its original packaging.
Return procedure for ISL88708IP831Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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