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Renesas ISL88708IB831Z
- Part No.:
- ISL88708IB831Z
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL88708IB831Z.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,091
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Product details
Overview
ISL88708IB831Z 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 delay 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, consumes ≤10µA at 3V, and asserts reset down to VDD = 1V - used in battery-powered portable systems for reliable power-up sequencing and brownout protection.
For engineers reviewing the ISL88708IB831Z datasheet, ISL88708IB831Z pinout, ISL88708IB831Z application, or ISL88708IB831Z equivalent, key selection criteria include its ±1.8% VTH accuracy, 140ms minimum reset pulse width, CPOR-adjustable tPOR (200ms nominal), dual reset polarity support, and immunity to power-supply transients in industrial-temperature (–40°C to +85°C) SOIC-8 packaging.
Technical Context
The ISL88708IB831Z integrates four core supervision functions: precise VDD monitoring with hysteresis (3.09V ±1.8%), auxiliary PFI input with 1.25V threshold for low-battery or power-fail detection, 1.6s watchdog timer cleared by WDI edge transitions, and manual reset (MR) with internal 20kΩ pull-up. Its dual RST/RST outputs enable direct interface with both active-high and active-low logic domains without external inverters.
Unlike ISL88705/88706 variants, the ISL88708IB831Z includes the CPOR pin for user-adjustable POR timeout (e.g., 50pF → ~1.4s), and unlike ISL88716/88813, it retains full watchdog functionality. All functions operate reliably across –40°C to +85°C with reset assertion valid down to VDD = 1V and ultra-low 10µA max supply current at 3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold | 3.09V ±1.8% - factory-trimmed trip point ensures accurate 3.3V rail supervision with minimal false resets during noise or droop. |
| Supply Current | ≤10µA at 3V - enables multi-year operation in coin-cell–powered portable devices without compromising supervision reliability. |
| Reset Pulse Width | 140–260ms - guarantees sufficient hold time for FPGA configuration, microcontroller initialization, and oscillator stabilization. |
| Watchdog Timeout | 1.6s typical - detects microprocessor lockup or firmware hang without requiring software intervention or external timing components. |
| PFI Threshold | 1.25V ±50mV - supports flexible auxiliary voltage monitoring (e.g., battery voltage via resistor divider) with 20mV hysteresis to prevent chatter. |
| Operating Temp | –40°C to +85°C - validated for industrial-grade embedded systems including notebooks, communications equipment, and intelligent instruments. |
| VDD Range | 2.0V to 5.5V - accommodates wide-input power architectures while maintaining reset validity down to 1V supply. |
Pinout & Package
ISL88708IB831Z is housed in an 8-lead narrow-body SOIC package (JEDEC MS-012-AA, pkg drawing M8.15), RoHS-compliant, with 1.27mm lead pitch and 5.00mm × 4.00mm body dimensions.
| 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 - enables push-button or logic-driven system reset. |
| 2 VDD | Power Supply Input | Main supply rail input monitored against 3.09V threshold; reset asserted on power-up, brownout, or dropout - valid down to VDD = 1V. |
| 3 GND | Ground Reference | System ground return path for all internal comparators, timers, and output drivers - must be low-impedance for noise immunity. |
| 4 PFI | Power-Fail Input | Auxiliary voltage monitor input with 1.25V threshold; drives PFO high when PFI > 1.25V - used for battery warning or secondary supply monitoring. |
| 5 PFO | Power-Fail Output | Open-drain active-high output reflecting PFI state; sinks 2.5mA at VDD ≥3.3V - connects directly to MCU interrupt or status LED. |
| 6 CPOR | Adjustable POR Delay Input | Capacitor connection point to ground; scales tPOR from 200ms (open) to >1s (e.g., 50pF → ~1.4s) - eliminates need for external RC timing networks. |
| 7 RST | Active-Low Reset Output | Push-pull active-low output with PMOS pull-up; drives low during reset, high otherwise - interfaces natively with reset inputs requiring active-low assertion. |
| 8 RST | Active-High Reset Output | Push-pull active-high output; drives high during reset, low otherwise - eliminates external inverter for systems requiring active-high reset signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Polarity Reset Outputs | RST (active-low) and RST (active-high) provide simultaneous compatibility with mixed-logic systems - no level-shifting or inversion required. |
| Adjustable Power-On Reset Delay | CPOR pin enables precise tPOR extension beyond 200ms using a single external capacitor - simplifies timing-critical boot sequences without extra ICs. |
| Ultra-Low Quiescent Current | ≤10µA at 3V allows integration into always-on battery-backed subsystems without significant runtime impact. |
| Immunity to Supply Transients | Hysteresis (37mV at 3.09V) and internal filtering prevent false resets during switching noise or brief voltage dips - critical for noisy DC/DC environments. |
| Wide Auxiliary Monitoring Range | PFI accepts voltages down to 1.25V and supports custom thresholds >1.25V via resistor divider - enables flexible low-battery, presence, or OV/UV detection. |
Applications
| Battery-Powered Portable Equipment | Notebook/Desktop Computer Systems |
|---|---|
Use Scenario: Coin-cell–powered data loggers require reliable power-up sequencing and brownout recovery without draining backup power. IC Role / Device Role / Timing Role: ISL88708IB831Z monitors main 3.3V rail and battery voltage (via PFI), asserts dual-reset signals for MCU/FPGA initialization, and extends tPOR via CPOR to accommodate slow LDO startup. Use Value: 10µA quiescent current preserves battery life; ±1.8% VTH accuracy prevents premature shutdown; dual RST/RST eliminates board-level inverters. |
Use Scenario: Motherboard power management must detect 3.3V rail faults, warn of impending AC loss, and trigger graceful shutdown before battery depletion. IC Role / Device Role / Timing Role: ISL88708IB831Z supervises 3.3V VDD, uses PFI to monitor +5VSB or battery voltage, asserts RST to halt CPU execution, and drives PFO to BIOS interrupt line. Use Value: 1.25V PFI threshold enables early low-battery warning; 1.6s watchdog detects OS hangs; CPOR-adjustable tPOR aligns with VRM ramp times. |
| Industrial Embedded Controllers | Communications System Power Management |
Use Scenario: Programmable logic controllers (PLCs) demand deterministic reset behavior under wide temperature and EMI conditions. IC Role / Device Role / Timing Role: ISL88708IB831Z provides VDD supervision, manual reset via front-panel button (MR), and watchdog monitoring of real-time firmware execution. Use Value: –40°C to +85°C rating ensures operation in harsh enclosures; reset valid down to VDD = 1V prevents latch-up during brownouts; hysteresis rejects EMI-induced glitches. |
Use Scenario: Base station power modules require redundant voltage monitoring for +3.3V digital rails and –48V backup supplies. IC Role / Device Role / Timing Role: ISL88708IB831Z monitors +3.3V VDD and uses PFI with resistor divider to sense –48V presence; PFO triggers failover control logic. Use Value: Bipolar sensing capability (via PFI divider) enables negative rail monitoring; dual reset outputs simplify interface to FPGA and ASIC reset domains. |
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 3.09V VDD threshold, SOIC-8 package, and –40°C to +85°C rating, but lacks CPOR pin and dual RST/RST - only provides RST (active-low) output. | No adjustable tPOR or active-high reset; requires external inverter if RST signal needed; suitable for cost-sensitive designs where timing flexibility is not required. | Select ISL88706IB831Z only when CPOR adjustment and dual-reset polarity are unnecessary - reduces BOM count where legacy compatibility is prioritized. |
| MAX6326UR31-T | 3.08V threshold (±2.5%), 1.6s watchdog, active-low reset only, 20µA max IDD at 3V, SOT23-5 package - no PFI/PFO or manual reset input. | Lacks auxiliary monitoring, manual reset, and dual-output capability; limited to basic VDD supervision in space-constrained applications. | Choose MAX6326UR31-T only for ultra-small footprint requirements where PFI, MR, and RST are omitted - not a functional substitute for ISL88708IB831Z's full feature set. |
Compared with ISL88706IB831Z and MAX6326UR31-T, the ISL88708IB831Z uniquely delivers CPOR-adjustable POR timing, simultaneous active-high/active-low reset outputs, and integrated PFI/PFO monitoring - enabling single-chip supervision of complex multi-rail, battery-backed, or watchdog-critical systems without external components.
Availability
ISL88708IB831Z is available at Aetrix Electronics and suitable for portable/battery-powered equipment, notebook/desktop computer systems, and industrial embedded controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for ISL88708IB831Z 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 leader in precision analog and power management ICs, delivering high-reliability solutions for industrial, computing, and communications markets.
The ISL88708IB831Z belongs to Intersil's microprocessor supervisor product line, engineered specifically for robust power-up sequencing, brownout protection, and watchdog monitoring in battery-constrained and noise-prone embedded systems.
FAQ
What is the exact VDD voltage threshold for ISL88708IB831Z?
The ISL88708IB831Z has a factory-programmed VDD voltage threshold of 3.09V with ±1.8% accuracy over temperature (–40°C to +85°C). This value is confirmed in the Ordering Information table (page 2) and Electrical Specifications (page 5) of FN8092 Rev 6.00, where VTH1 min/typ/max = 3.034V/3.090V/3.146V. The "B831Z" suffix explicitly denotes the 3.09V variant.
Does ISL88708IB831Z support adjustable power-on reset timeout?
Yes, the ISL88708IB831Z supports adjustable power-on reset timeout via the CPOR pin. Connecting an external capacitor from CPOR to ground scales tPOR from the nominal 200ms (CPOR open) to longer durations - e.g., 50pF extends it to ~1.4s. This feature is exclusive to ISL88707/ISL88708 variants and is documented in Figures 3 and 11 of FN8092 Rev 6.00.
What are the key differences between ISL88708IB831Z and ISL88706IB831Z?
The ISL88708IB831Z includes CPOR for adjustable tPOR and both RST (active-low) and RST (active-high) outputs, whereas ISL88706IB831Z offers only RST and no CPOR pin. Both share identical 3.09V VDD threshold, SOIC-8 package, and –40°C to +85°C rating. The ISL88708IB831Z thus provides greater design flexibility for timing-critical or dual-logic-domain systems.
Can ISL88708IB831Z monitor voltages other than VDD?
Yes, the ISL88708IB831Z includes a dedicated PFI (Power-Fail Input) pin with a 1.25V threshold that drives the PFO (Power-Fail Output) pin. By adding a resistor divider to PFI, users can monitor auxiliary voltages above 1.25V - such as battery voltage or secondary supplies - for low-battery warning, presence detection, or OV/UV events, as shown in Figure 2 of FN8092 Rev 6.00.
What is the watchdog timer timeout period for ISL88708IB831Z?
The ISL88708IB831Z features a watchdog timer with a nominal timeout period of 1.6s, specified as 1.0s to 2.0s over temperature (page 6, tWDT parameter). The timer is cleared by any edge transition on the WDI pin or by assertion of MR. When expired, WDO pulls low periodically (~1.9s cycle, ~220ms duration) until WDI toggles again - providing robust firmware hang detection without software overhead.
ISL88708IB831Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISL88708IB831Z FAQ
1.How can I place an order for ISL88708IB831Z through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88708IB831Z 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 reliable?
The price and inventory of ISL88708IB831Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88708IB831Z is usually 5 days.
3.What payment methods are accepted for ISL88708IB831Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88708IB831Z transactions.
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4.How is shipping managed for ISL88708IB831Z?
ISL88708IB831Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88708IB831Z 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?
For technical support, including ISL88708IB831Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88708IB831Z requirements.
6.How does Aetrix verify that ISL88708IB831Z is sourced from the original manufacturer or authorized distributors?
All ISL88708IB831Z 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 meets industry standards.
7.What is the process for return or replacement of ISL88708IB831Z?
All ISL88708IB831Z units undergo pre-shipment inspection (PSI). If there is an issue with ISL88708IB831Z, 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 part is unused and in its original packaging.
Return procedure for ISL88708IB831Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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