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Renesas ISL88708IB826Z-TK
- Part No.:
- ISL88708IB826Z-TK
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL88708IB826Z-TK.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,387
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Product details
Overview
ISL88708IB826Z-TK from Renesas (formerly Intersil) is a microprocessor supervisor IC with dual reset outputs (active-high RST and active-low RST), 2.63V ±1.8% VDD voltage threshold, 1.6s watchdog timer, auxiliary 1.25V PFI monitor, and adjustable power-on reset delay via CPOR pin. It operates from 2.0V to 5.5V supply and draws ≤10µA at 3V, targeting battery-powered embedded systems requiring reliable brownout and manual reset control.
For engineers reviewing the ISL88708IB826Z-TK datasheet, ISL88708IB826Z-TK pinout, ISL88708IB826Z-TK application, or ISL88708IB826Z-TK equivalent, key selection considerations include its dual RST/RST outputs, CPOR-adjustable tPOR (200ms nominal, scalable with external capacitor), ±1.8% threshold accuracy, immunity to supply transients, and operation down to VDD = 1V for valid reset assertion.
Technical Context
The ISL88708IB826Z-TK integrates a precision bandgap reference, POR circuit with hysteresis, debounced manual reset input (MR), and independent watchdog timer with 1.6s timeout. Its dual-reset architecture enables simultaneous active-high and active-low signaling for compatibility with diverse logic families and processor reset requirements.
It features an auxiliary power-fail monitor (PFI/PFO) with fixed 1.25V threshold and 20mV hysteresis, supporting low-battery warning or secondary supply monitoring. The CPOR pin allows user-defined extension of the power-on reset timeout beyond the nominal 200ms using an external capacitor-functionality exclusive to the ISL88707/ISL88708 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold | 2.63V ±1.8% - ensures reliable reset assertion during brownout below 2.583V and release above 2.677V |
| Supply Current | ≤10µA at 3V - enables multi-year operation in coin-cell–powered systems without compromising supervision integrity |
| Watchdog Timeout | 1.6s typical - provides sufficient margin to detect firmware lockup while avoiding false triggers from normal task delays |
| Reset Pulse Width | ≥140ms minimum - guarantees processor initialization time meets ARM Cortex-M and similar MCU requirements |
| PFI Threshold | 1.25V ±50mV - supports direct low-voltage monitoring or adjustable external voltage detection via resistor divider |
| Operating Range | −40°C to +85°C - validated for industrial temperature environments without derating |
| Reset Validity | Down to VDD = 1V - maintains functional reset assertion even during deep brownout conditions before full power collapse |
Pinout & Package
ISL88708IB826Z-TK is housed in an 8-lead SOIC package (JEDEC MS-012-AA, RoHS-compliant, M8.15 outline), measuring 4.90mm × 3.90mm × 1.45mm, suitable for automated SMT assembly and reflow soldering.
| 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 | Power Supply Input | Main supply rail monitored against 2.63V threshold; reset asserted if VDD drops below 2.583V |
| 3 GND | Ground Reference | Common return path for all internal circuits and output drivers; must be low-impedance for noise immunity |
| 4 PFI | Power-Fail Input | Auxiliary voltage monitor input; asserts PFO high when voltage exceeds 1.25V (±50mV) |
| 5 PFO | Power-Fail Output | Open-drain output indicating PFI status; pulls low when PFI < 1.25V, used for low-battery warning |
| 6 CPOR | Adjustable POR Delay Input | Capacitor connection point to extend tPOR beyond 200ms; 50pF yields ~1.4s delay |
| 7 RST | Active-Low Reset Output | Push-pull output driven low during reset; sinks 2.5mA at VDD ≥3.3V with VOL ≤0.4V |
| 8 RST | Active-High Reset Output | Push-pull output driven high during reset; sources 0.8mA at VDD ≥3.3V with VOH ≥VDD−0.6V |
Key Features
| Feature | Design Value |
|---|---|
| Dual RST/RST outputs | Simultaneous active-high and active-low reset signals eliminate need for external level-shifting or inverters |
| CPOR-adjustable tPOR | Enables precise tuning of power-on reset duration from 200ms to >1s using a single external capacitor |
| 2.63V ±1.8% VDD threshold | Meets tight tolerance requirements for 2.7V–2.8V system rails, reducing risk of premature or delayed reset |
| 1.25V PFI monitor with hysteresis | Provides stable low-battery detection without oscillation during gradual voltage decay |
| Ultra-low 10µA supply current | Minimizes quiescent drain on backup batteries or energy-harvesting sources |
| Reset validity down to 1V VDD | Ensures fail-safe behavior during catastrophic supply collapse, unlike supervisors releasing reset prematurely |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: A wireless environmental sensor node powered by a CR2032 coin cell monitors temperature/humidity and transmits data every 5 minutes. IC Role / Device Role / Timing Role: ISL88708IB826Z-TK supervises the 3.0V LDO output, asserts reset during brownout, and uses PFI to detect battery depletion below 2.4V via resistor divider. Use Value: Dual RST/RST outputs interface directly with both the MCU's active-low reset pin and a low-power RF transceiver's active-high enable line, eliminating discrete logic. |
Use Scenario: An isolated digital input module in a factory automation system requires robust reset behavior during 24VDC supply fluctuations and EMI events. IC Role / Device Role / Timing Role: ISL88708IB826Z-TK monitors the local 3.3V logic rail and uses CPOR to extend tPOR to 400ms, ensuring FPGA configuration completes before MCU boot. Use Value: Immunity to supply transients prevents spurious resets during relay switching or motor startup, improving system uptime. |
| Medical Wearable Monitor | Point-of-Sale Terminal |
|
Use Scenario: A wrist-worn ECG monitor uses a rechargeable Li-ion battery and must maintain data integrity across charge cycles and low-power sleep states. IC Role / Device Role / Timing Role: ISL88708IB826Z-TK supervises the 2.8V analog front-end supply and connects WDI to the MCU's GPIO to detect firmware hangs during signal processing. Use Value: Watchdog timeout (1.6s) aligns with clinical algorithm execution windows, while 10µA quiescent current extends battery life between charges. |
Use Scenario: A retail terminal with barcode scanner, thermal printer, and EMV card reader experiences intermittent 5V rail droop during peripheral activation. IC Role / Device Role / Timing Role: ISL88708IB826Z-TK monitors the main 5V rail and uses MR to implement a hardware "hard reset" button accessible to service technicians. Use Value: Manual reset pulse width (≥550ns) tolerates mechanical switch bounce, and reset remains asserted for ≥140ms to guarantee full system recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT26D3+ | Single active-low RST output; fixed 2.63V threshold; no CPOR or PFI capability; 3µA max IDD | Lacks auxiliary voltage monitoring and adjustable POR; suited only for basic reset-only use cases | Select when lowest possible quiescent current is critical and dual reset/PFI/CPOR are unnecessary |
| TPS3808G33DBVR | Single active-low RST; 3.3V threshold; adjustable delay via external resistor; no PFI or dual-RST | Requires external components for delay tuning; no auxiliary monitoring; higher 12µA IDD | Choose for cost-sensitive designs needing programmable delay but not PFI or dual-output flexibility |
Compared with MAX6326UT26D3+ and TPS3808G33DBVR, the ISL88708IB826Z-TK uniquely delivers dual RST/RST outputs, integrated PFI/PFO for secondary voltage monitoring, and CPOR-based tPOR adjustment-all in a single 8-pin SOIC, enabling compact, feature-rich supervision without external components.
Availability
ISL88708IB826Z-TK is available at Aetrix Electronics and suitable for portable medical devices, industrial edge controllers, and battery-backed data loggers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL88708IB826Z-TK 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 Corporation (formerly Intersil) is a global leader in microcontrollers, analog power, and SoC solutions, serving automotive, industrial, infrastructure, and IoT markets with high-reliability semiconductor products.
The ISL88708IB826Z-TK belongs to Renesas' precision analog supervisor family, designed specifically for ultra-low-power, high-accuracy voltage monitoring in space-constrained and battery-dependent embedded systems.
FAQ
What is the exact voltage threshold and accuracy of the ISL88708IB826Z-TK?
The ISL88708IB826Z-TK has a factory-programmed VDD voltage trip point of 2.63V with ±1.8% accuracy over temperature (−40°C to +85°C), meaning the actual threshold ranges from 2.583V to 2.677V. This specification is 100% tested at +25°C and characterized across temperature, ensuring consistent brownout detection for 2.7V–2.8V system rails without calibration.
Does the ISL88708IB826Z-TK support both active-high and active-low reset outputs?
Yes, the ISL88708IB826Z-TK provides two independent reset outputs: pin 7 (RST) is active-low with PMOS pull-up, and pin 8 (RST) is active-high push-pull. Both assert simultaneously during power-up, brownout, or manual reset, enabling direct interface with MCUs, FPGAs, and peripherals requiring either polarity without external inverters.
How does the CPOR pin on the ISL88708IB826Z-TK adjust the power-on reset timeout?
The CPOR pin (pin 6) accepts an external capacitor to ground, scaling the nominal 200ms power-on reset timeout (tPOR). For example, a 50pF capacitor extends tPOR to approximately 1.4s. The relationship is nonlinear and documented in Figure 11 of the FN8092 datasheet; layout must minimize stray capacitance to maintain timing accuracy.
Can the ISL88708IB826Z-TK monitor a second voltage such as a battery supply?
Yes, the ISL88708IB826Z-TK includes a dedicated Power-Fail Input (PFI, pin 4) with a fixed 1.25V threshold and 20mV hysteresis. When used with an external resistor divider, it can monitor voltages above 1.25V-such as a 3.0V battery rail-and drive the PFO output (pin 5) to signal low-battery conditions or power-fail warnings.
What is the maximum supply current consumption of the ISL88708IB826Z-TK?
The ISL88708IB826Z-TK consumes ≤10µA at VDD = 3V and ≤19µA at VDD = 5V under static conditions with the watchdog timer inactive. This ultra-low quiescent current is specified over the full −40°C to +85°C operating range and enables multi-year operation in battery-powered applications without compromising supervision reliability.
ISL88708IB826Z-TK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-TK FAQ
1.How can I place an order for ISL88708IB826Z-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88708IB826Z-TK 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-TK reliable?
The price and inventory of ISL88708IB826Z-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88708IB826Z-TK is usually 5 days.
3.What payment methods are accepted for ISL88708IB826Z-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88708IB826Z-TK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL88708IB826Z-TK?
ISL88708IB826Z-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88708IB826Z-TK 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-TK?
For technical support, including ISL88708IB826Z-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88708IB826Z-TK requirements.
6.How does Aetrix verify that ISL88708IB826Z-TK is sourced from the original manufacturer or authorized distributors?
All ISL88708IB826Z-TK 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-TK meets industry standards.
7.What is the process for return or replacement of ISL88708IB826Z-TK?
All ISL88708IB826Z-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL88708IB826Z-TK, 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-TK part is unused and in its original packaging.
Return procedure for ISL88708IB826Z-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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