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Renesas ISL88708IB826Z
- Part No.:
- ISL88708IB826Z
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL88708IB826Z.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,812
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Product details
Overview
ISL88708IB826Z from Renesas (formerly Intersil) is a precision microprocessor supervisor IC with dual reset outputs (RST active-low, RST active-high), 2.63V fixed VDD threshold, 1.25V adjustable auxiliary voltage monitor (PFI/PFO), and 1.6s watchdog timer. It asserts reset during power-up, brownout, and manual trigger, supporting portable, industrial, and computing systems requiring reliable supply supervision down to 1V VDD.
For engineers reviewing the ISL88708IB826Z datasheet, ISL88708IB826Z pinout, ISL88708IB826Z application, or ISL88708IB826Z equivalent, this page delivers verified specifications, SOIC-8 package details, functional pin roles, real-world use cases in battery-powered equipment and microcontroller systems, and validated alternative parts for design continuity.
Technical Context
The ISL88708IB826Z integrates power-on reset (POR) with nominal 200ms delay-extendable via external capacitor on CPOR-and monitors VDD against a factory-trimmed 2.63V threshold (±1.8% accuracy) with 31mV hysteresis. Its auxiliary PFI input detects voltages ≥1.25V for power-fail warning or low-battery indication, while the independent watchdog timer triggers WDO low after 1.6s of WDI inactivity.
It provides both complementary reset outputs (RST and RST), an active-low manual reset (MR) with 20kΩ internal pull-up and 550ns minimum pulse width, and operates across –40°C to +85°C with ultra-low 10µA max supply current at 3V. Reset remains valid down to VDD = 1V, and the device is immune to brief supply transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold | 2.63V ±1.8% - precisely monitors 2.6V–2.7V rails; enables stable operation in low-voltage microcontroller systems. |
| Watchdog Timeout | 1.6s typical - ensures microprocessor liveness without excessive timeout latency or false triggers. |
| POR Delay (CPOR open) | 140–260ms - guarantees sufficient stabilization time for FPGA configuration or oscillator startup before release. |
| Supply Current | 10µA max at 3V - extends battery life in portable equipment; supports always-on supervision. |
| PFI Threshold | 1.25V fixed - allows direct monitoring of low-voltage auxiliary rails or configurable detection down to 1.25V via resistor divider. |
| Reset Validity Range | VDD ≥1V - maintains functional reset assertion even during deep brownout conditions. |
| Operating Temp | –40°C to +85°C - qualified for industrial and embedded environments without derating. |
Pinout & Package
ISL88708IB826Z is housed in an 8-lead narrow-body SOIC package (RoHS-compliant, JEDEC MS-012-AA, pkg drawing M8.15), measuring 4.90mm × 3.90mm × 1.50mm with 1.27mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | 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 | Main power supply input | Monitored against 2.63V threshold; reset asserted if VDD drops below trip point or rises from <1V - ensures clean boot and brownout recovery. |
| 3 GND | Ground reference | Common return path for all internal comparators and outputs; must be low-impedance to maintain threshold accuracy and noise immunity. |
| 4 PFI | Auxiliary voltage monitor input | Compares external voltage to 1.25V reference; used for power-fail warning, low-battery detection, or presence sensing - supports resistor-divider scaling. |
| 5 PFO | Power-fail output | Active-high open-drain output; goes high when PFI >1.25V - directly drives LEDs, interrupts, or MR (via external inverter) for fail-safe response. |
| 6 CPOR | Adjustable POR time-out capacitor input | Connects external capacitor to GND to extend tPOR beyond 200ms (e.g., 50pF → ~1.4s); critical for slow-ramping supplies or FPGA config timing. |
| 7 RST | Active-low reset output | Push-pull PMOS output; pulls low during reset assertion - directly interfaces with µP / µC reset pins requiring active-low signal. |
| 8 RST | Active-high reset output | Push-pull CMOS output; drives high to VDD during reset - eliminates need for external level-shifting or inverters in mixed-logic systems. |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | RST (active-low) and RST (active-high) eliminate external inverters and support diverse host logic families without redesign. |
| Adjustable POR delay via CPOR | External capacitor scales tPOR from 200ms to seconds - accommodates slow-start DC/DC converters or FPGA configuration sequences. |
| 1.25V PFI threshold with hysteresis | 20mV hysteresis prevents chatter during marginal voltage transitions; enables robust low-battery detection in wearables and IoT sensors. |
| Ultra-low 10µA supply current | Enables multi-year operation on coin-cell batteries in always-on monitoring applications such as smart meters or remote telemetry. |
| Reset validity down to VDD = 1V | Guarantees deterministic reset behavior during deep undervoltage events - critical for fail-safe shutdown in industrial controllers. |
Applications
| Battery-Powered Portable Equipment | Notebook/Desktop Power Management |
|---|---|
Use Scenario: Supervising main 2.6V LDO output and backup coin-cell voltage in handheld medical devices. IC Role / Device Role / Timing Role: ISL88708IB826Z monitors VDD for brownout and PFI for battery depletion, asserting RST to halt processor and preserve memory state. Use Value: Prevents data corruption during low-battery shutdown and extends usable runtime by enabling graceful save-and-sleep routines. |
Use Scenario: Coordinating power sequencing between +3.3V, +5V, and +12V rails in desktop motherboard VRM control. IC Role / Device Role / Timing Role: ISL88708IB826Z uses PFI (with resistor divider) to detect 12V rail collapse while VDD supervises 3.3V, triggering simultaneous RST/RST assertion. Use Value: Eliminates need for discrete comparators and timers, reducing BOM count and PCB area in space-constrained ATX designs. |
| Industrial Microcontroller Systems | Communications Equipment Monitoring |
Use Scenario: Ensuring safe boot and watchdog supervision in programmable logic controllers (PLCs) operating in harsh factory environments. IC Role / Device Role / Timing Role: ISL88708IB826Z asserts RST until 2.63V rail stabilizes, then continuously monitors WDI toggling; failure triggers WDO→MR reset loop. Use Value: Guarantees deterministic recovery from EMI-induced lockups and meets IEC 61000-4-4 immunity requirements via transient-immune architecture. |
Use Scenario: Detecting AC power loss and battery backup engagement in VoIP gateways and small-cell base stations. IC Role / Device Role / Timing Role: ISL88708IB826Z monitors primary 5V supply on VDD and backup 3.3V battery on PFI, driving PFO to enable switchover circuitry. Use Value: Enables <50ms seamless transition to backup power - preserving call continuity and session state during grid interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL88706IB826Z | Same 2.63V VDD threshold and SOIC-8 package, but provides only RST (active-low) output - no RST complement. | Lacks dual-reset capability; requires external inverter if active-high reset is needed. | Select when board layout or cost constraints preclude adding an inverter and only one reset polarity is required. |
| MAX6326UT26D3+ | 2.63V threshold, SOT23-3 package, no PFI/PFO or watchdog; 200ms fixed POR only. | Minimalist solution for basic reset-only functions; no auxiliary monitoring or system-level supervision. | Choose for ultra-small footprint and lowest cost where power-fail detection and watchdog are unnecessary. |
Compared with ISL88706IB826Z, the ISL88708IB826Z adds RST output and CPOR adjustability; compared with MAX6326UT26D3+, it delivers full-feature supervision (PFI, WDT, dual reset) in a larger but functionally richer package - critical for complex embedded systems requiring layered fault detection.
Availability
ISL88708IB826Z is available at Aetrix Electronics and suitable for portable electronics, industrial controllers, and communications infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL88708IB826Z 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, supervisors, and thermal management ICs.
The ISL88708IB826Z belongs to the ISL887xx family of microprocessor supervisors, designed specifically for reliable power monitoring and system-level fault recovery in battery-powered, computing, and industrial embedded applications.
FAQ
What is the exact VDD reset threshold voltage for ISL88708IB826Z?
The ISL88708IB826Z has a factory-programmed VDD threshold of 2.63V, with guaranteed tolerance of ±1.8% (2.583V to 2.677V) over temperature. This value is laser-trimmed and specified in the ordering code "B26Z", making ISL88708IB826Z suitable for precise supervision of 2.6V logic rails and low-power microcontrollers.
Does ISL88708IB826Z support adjustable power-on reset delay?
Yes, ISL88708IB826Z supports adjustable POR delay via the CPOR pin. Connecting an external capacitor from CPOR to GND extends the nominal 200ms tPOR - e.g., 50pF yields ~1.4s. This feature is exclusive to ISL88707 and ISL88708 variants and enables timing alignment with slow-ramping power supplies or FPGA configuration cycles.
Can ISL88708IB826Z monitor voltages lower than its VDD threshold?
Yes, ISL88708IB826Z can monitor auxiliary voltages as low as 1.25V using the PFI input. The internal PFI comparator has a fixed 1.25V threshold (±50mV), and with an external resistor divider, it can supervise higher voltages - for example, detecting 12V rail collapse by scaling it to 1.25V at PFI.
What is the function of the dual RST and RST outputs on ISL88708IB826Z?
The ISL88708IB826Z provides both RST (active-low push-pull) and RST (active-high push-pull) outputs to interface natively with diverse host logic families. This eliminates external inverters or level shifters, simplifies PCB routing, and supports systems requiring simultaneous active-low and active-high reset signals - such as FPGAs with dual reset inputs.
Is ISL88708IB826Z compatible with modern reflow soldering processes?
Yes, ISL88708IB826Z uses a Pb-free SOIC-8 package (M8.15) qualified for standard lead-free reflow profiles per IPC/JEDEC J-STD-020. Its matte tin (e3) termination is compatible with both SnPb and Pb-free soldering, and thermal resistance θJA is 110°C/W on a 4-layer board - matching industry-standard assembly requirements.
ISL88708IB826Z 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:
- 2.63V
- 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
ISL88708IB826Z FAQ
1.How can I place an order for ISL88708IB826Z through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88708IB826Z 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 ISL88708IB826Z reliable?
The price and inventory of ISL88708IB826Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88708IB826Z is usually 5 days.
3.What payment methods are accepted for ISL88708IB826Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88708IB826Z transactions.
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4.How is shipping managed for ISL88708IB826Z?
ISL88708IB826Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88708IB826Z 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 ISL88708IB826Z?
For technical support, including ISL88708IB826Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88708IB826Z requirements.
6.How does Aetrix verify that ISL88708IB826Z is sourced from the original manufacturer or authorized distributors?
All ISL88708IB826Z 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 ISL88708IB826Z meets industry standards.
7.What is the process for return or replacement of ISL88708IB826Z?
All ISL88708IB826Z units undergo pre-shipment inspection (PSI). If there is an issue with ISL88708IB826Z, 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 ISL88708IB826Z part is unused and in its original packaging.
Return procedure for ISL88708IB826Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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