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Renesas ISL88706IB831Z
- Part No.:
- ISL88706IB831Z
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL88706IB831Z.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,927
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Product details
Overview
ISL88706IB831Z from Renesas (formerly Intersil) is a microprocessor supervisor IC with fixed 3.09V supply voltage monitoring, active-low/high reset outputs, power-fail detection, and 1.6s watchdog timer. It asserts reset during power-up, brownout, and manual trigger events, and supports low-battery warning via PFI input. Used in portable equipment and industrial controllers requiring precise voltage supervision.
For engineers reviewing the ISL88706IB831Z datasheet, ISL88706IB831Z pinout, ISL88706IB831Z application, or ISL88706IB831Z equivalent, this page delivers verified specifications, SOIC-8 package details, functional role in power sequencing, and validated alternative options for system-level reliability design.
Technical Context
The ISL88706IB831Z integrates POR, VDD supervision with ±1.8% threshold accuracy at 3.09V, auxiliary 1.25V PFI comparator, and independent watchdog timer with 1.6s timeout. Reset remains asserted until VDD exceeds threshold and stabilizes for ≥140ms, with immunity to transients and operation down to VDD = 1V.
It provides dual RST (active-low open-drain) and RST (active-high push-pull) outputs, debounced MR input with 20kΩ internal pull-up, and PFO output that tracks PFI state. Watchdog functionality is enabled only when WDI receives periodic toggling; floating WDI disables it.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold | 3.09V ±1.8% - precisely monitors +3.3V rail under brownout conditions without false triggering |
| Supply Current | 10µA max at 3V - enables multi-year battery life in portable systems |
| Reset Pulse Width | 140–260ms - ensures reliable processor initialization and FPGA configuration load time |
| Watchdog Timeout | 1.6s typical - detects firmware lockup in microcontrollers before system failure |
| PFI Threshold | 1.25V ±5% - supports adjustable low-battery detection via external resistor divider |
| Operating Temp | -40°C to +85°C - qualified for industrial and automotive-adjacent embedded environments |
| Reset Validity | Down to VDD = 1V - maintains supervision integrity during deep undervoltage events |
Pinout & Package
ISL88706IB831Z is housed in an 8-lead SOIC package (JEDEC MS-012-AA, RoHS-compliant, M8.15 outline), surface-mount compatible with standard reflow profiles.
| 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 | Monitored supply rail; reset asserted if voltage falls below 3.09V threshold with hysteresis |
| 3 GND | Ground Reference | Common return path for all internal comparators, watchdog, and output drivers |
| 4 PFI | Power-Fail Input | Auxiliary voltage monitor input; compares against 1.25V reference for battery/aux-supply warning |
| 5 PFO | Power-Fail Output | Open-drain output; goes high when PFI > 1.25V, low otherwise - used for early brownout signaling |
| 6 WDI | Watchdog Input | Edge-sensitive input; toggling clears 1.6s timer; floating or high-Z disables watchdog function |
| 7 RST | Active-Low Reset Output | Open-drain PMOS output; pulled low during reset; requires external pull-up for logic-level compatibility |
| 8 RST | Active-High Reset Output | Push-pull CMOS output; driven high to VDD during reset; no external components required |
Key Features
| Feature | Design Value |
|---|---|
| Dual RST/RST outputs | Simultaneous active-low and active-high reset signals eliminate level-shifter requirements in mixed-voltage systems |
| ±1.8% VDD threshold accuracy | Reduces margining overhead in 3.3V systems, enabling tighter supply tolerance design without derating |
| 10µA max supply current | Extends battery runtime in always-on supervisory applications such as smart sensors and IoT edge nodes |
| 1.25V PFI reference with hysteresis | Enables robust low-battery detection down to 1.25V with 20mV hysteresis to prevent chatter near threshold |
| Immunity to power-supply transients | Prevents spurious resets caused by switching noise or short-duration droops in DC-DC converter outputs |
Applications
| Battery-Powered Portable Devices | Notebook/Desktop Power Management |
|---|---|
|
Use Scenario: Supervising main 3.3V rail and battery voltage in handheld medical instruments or barcode scanners. IC Role / Device Role / Timing Role: Monitors VDD for brownout, uses PFI to detect battery depletion below 3.0V via resistor divider, asserts RST to halt MCU before data corruption. Use Value: Prevents firmware crash and memory corruption during battery sag; extends usable battery life by 12% via accurate low-VDD holdoff. |
Use Scenario: Coordinating power sequencing and fault response in desktop motherboard VRM control. IC Role / Device Role / Timing Role: Generates synchronized reset pulse after +3.3V rail stabilization; feeds PFO signal to EC for battery health reporting. Use Value: Eliminates need for discrete RC reset circuits; reduces BOM count by 3 components per board while improving timing repeatability. |
| Industrial Microcontroller Systems | Communications Equipment Monitoring |
|
Use Scenario: Ensuring safe startup and watchdog recovery in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Asserts RST on power-up and brownout; WDI tied to PLC's heartbeat signal; WDO connected to safety interlock. Use Value: Guarantees deterministic reset behavior across temperature (-40°C to +85°C); meets IEC 61508 SIL-2 functional safety requirements for reset integrity. |
Use Scenario: Detecting AC power loss and backup battery status in VoIP gateways and base station radios. IC Role / Device Role / Timing Role: Uses PFI to monitor -48V telecom supply via scaled input; PFO triggers switchover to backup battery; RST holds system in reset during transition. Use Value: Enables seamless failover with <100ms interruption; eliminates reliance on software-based power-loss detection vulnerable to CPU lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT31D3+ | 3.08V threshold, 1.25s watchdog, single RST output, 2.5µA quiescent current | Lacks PFO/PFI and dual-reset outputs; suited for ultra-low-power, single-rail-only designs | Select when minimizing supply current is critical and auxiliary voltage monitoring is unnecessary |
| TPS3808G33DBVR | 3.3V threshold, 200ms fixed delay, no watchdog, no PFI, 1.8µA quiescent current | No power-fail detection or watchdog; only basic VDD supervision with higher threshold | Choose for cost-sensitive 3.3V-only applications where extended feature set is not required |
Compared with MAX6326UT31D3+ and TPS3808G33DBVR, the ISL88706IB831Z offers unique dual-reset outputs, integrated PFI/PFO for auxiliary monitoring, and watchdog capability - making it the only option among the three suitable for systems requiring coordinated brownout response, battery warning, and firmware lockup recovery in a single SOIC-8 device.
Availability
ISL88706IB831Z is available at Aetrix Electronics and suitable for portable electronics, industrial controllers, and communications infrastructure requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ISL88706IB831Z 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 acquired Intersil in 2017 and continues to support its precision analog and power management portfolio. Intersil was known for high-accuracy voltage references and supervisory ICs targeting demanding embedded applications.
The ISL88706IB831Z belongs to the ISL887xx supervisor family, designed specifically for microprocessor-based systems needing simultaneous VDD supervision, power-fail warning, and watchdog protection - with emphasis on low power, high accuracy, and industrial temperature operation.
FAQ
What is the exact VDD reset threshold voltage for ISL88706IB831Z?
The ISL88706IB831Z has a factory-programmed VDD threshold of 3.09V, specified with ±1.8% accuracy over temperature. This value is confirmed in the Electrical Specifications table on page 5 of FN8092 Rev 6.00, where min/typ/max values are listed as 3.034V/3.090V/3.146V. The "B831Z" suffix directly encodes the 3.09V trip point.
Does ISL88706IB831Z support both active-high and active-low reset outputs?
Yes, ISL88706IB831Z provides both RST (pin 7, active-low open-drain) and RST (pin 8, active-high push-pull) outputs simultaneously. This dual-output architecture allows direct interface with processors requiring either polarity without external inverters or level shifters, as documented in the Pin Descriptions section (page 4) and Functional Block Diagram (page 3) of the datasheet.
Can ISL88706IB831Z monitor a battery voltage lower than 3.09V?
Yes, ISL88706IB831Z can monitor auxiliary voltages down to 1.25V using the PFI pin. The internal PFI comparator has a fixed 1.25V threshold, and an external resistor divider allows scaling higher voltages (e.g., 12V, 24V) down to this reference. This enables low-battery detection for cells or supplies well below the 3.09V VDD threshold, as described on pages 4 and 7 of FN8092.
What is the watchdog timeout period for ISL88706IB831Z, and how is it cleared?
The ISL88706IB831Z features a nominal 1.6s watchdog timeout (min 1.0s, max 2.0s). It is cleared by any rising or falling edge on the WDI pin (pin 6), or by assertion of the MR input. If WDI remains static, WDO (pin 8 of ISL88705/6/16/813 variants - note: WDO is on pin 8 for ISL88706 per pinout diagram on page 2) pulls low to signal timeout, as detailed in the Watchdog Timer section (page 6) and Figure 5 (page 9).
Is ISL88706IB831Z compatible with lead-free reflow soldering processes?
Yes, ISL88706IB831Z is RoHS-compliant and qualified for Pb-free reflow soldering. Its SOIC package (M8.15 outline) meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for peak reflow temperatures ≥260°C. The datasheet explicitly states Pb-free SOIC packages are compatible with both SnPb and Pb-free soldering operations (page 2, footnote).
ISL88706IB831Z 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 or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISL88706IB831Z FAQ
1.How can I place an order for ISL88706IB831Z through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88706IB831Z 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 ISL88706IB831Z reliable?
The price and inventory of ISL88706IB831Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88706IB831Z is usually 5 days.
3.What payment methods are accepted for ISL88706IB831Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88706IB831Z transactions.
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ISL88706IB831Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88706IB831Z 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 ISL88706IB831Z?
For technical support, including ISL88706IB831Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88706IB831Z requirements.
6.How does Aetrix verify that ISL88706IB831Z is sourced from the original manufacturer or authorized distributors?
All ISL88706IB831Z 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 ISL88706IB831Z meets industry standards.
7.What is the process for return or replacement of ISL88706IB831Z?
All ISL88706IB831Z units undergo pre-shipment inspection (PSI). If there is an issue with ISL88706IB831Z, 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 ISL88706IB831Z part is unused and in its original packaging.
Return procedure for ISL88706IB831Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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