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Renesas ISL88708IB829Z-TK
- Part No.:
- ISL88708IB829Z-TK
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL88708IB829Z-TK.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,134
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Product details
Overview
ISL88708IB829Z-TK from Renesas (formerly Intersil) is a microprocessor supervisor IC with dual reset outputs (RST active-low and RST active-high), 2.92V ±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 -40°C to +85°C in portable battery-powered systems requiring reliable brownout detection and manual reset capability.
For engineers reviewing the ISL88708IB829Z-TK datasheet, ISL88708IB829Z-TK pinout, ISL88708IB829Z-TK application, or ISL88708IB829Z-TK equivalent, key selection criteria include its 2.92V trip point accuracy, ultra-low 10µA supply current at 3V, dual-reset architecture, CPOR-adjustable tPOR, and immunity to power-supply transients in space-constrained industrial and embedded designs.
Technical Context
The ISL88708IB829Z-TK integrates a precision bandgap reference, POR circuit with hysteresis, debounced manual reset input (MR), and independent watchdog timer monitoring WDI toggling every 1.6s (typ). Its dual-reset outputs provide simultaneous active-low and active-high signaling for compatibility with diverse logic families.
It features an auxiliary PFI input with fixed 1.25V threshold (±20mV hysteresis) for power-fail warning or low-battery detection, and supports external resistor dividers to monitor voltages >1.25V. The CPOR pin enables user-defined power-on reset timeout extension beyond the nominal 200ms using an external capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold | 2.92V ±1.8% - ensures reliable reset assertion during brownout down to 2.867V, critical for 3.0V system stability |
| Supply Current | 10µA max at 3V - enables multi-year operation in battery-backed applications without compromising supervision integrity |
| Watchdog Timeout | 1.6s typical - provides sufficient margin to detect firmware lockup while avoiding false triggers from normal task scheduling |
| Reset Pulse Width | 140–260ms - guarantees processor core and peripheral initialization completion before release |
| PFI Threshold | 1.25V ±20mV - allows precise low-voltage monitoring of backup rails or battery cells with minimal external components |
| Operating Temp | -40°C to +85°C - validated for industrial-grade reliability in uncontrolled ambient environments |
| VDD Range | 2.0V to 5.5V - supports supervision across 2.5V, 3.0V, 3.3V, and 5.0V logic domains without level-shifting |
Pinout & Package
ISL88708IB829Z-TK is housed in an 8-lead SOIC package (JEDEC MS-012-AA, M8.15 outline), RoHS-compliant, with 1.27mm lead pitch and 4.00mm × 5.00mm 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 |
| 2 VDD | Power Supply Input | Main supply rail monitored at 2.92V threshold; reset asserted if VDD drops below 2.867V (min) |
| 3 GND | Ground Reference | Common return path for all internal comparators, watchdog, and output drivers |
| 4 PFI | Power-Fail Input | Auxiliary voltage monitor input with 1.25V threshold; used for battery low-warning or secondary rail supervision |
| 5 PFO | Power-Fail Output | Open-drain output that goes high when PFI > 1.25V; signals healthy auxiliary voltage condition |
| 6 CPOR | Adjustable POR Delay Input | Connect external capacitor to ground to extend tPOR beyond 200ms (e.g., 50pF → ~1.4s) |
| 7 RST | Active-Low Reset Output | Push-pull output pulled 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 to VDD during reset; sources 0.8mA with VOH ≥ VDD–0.6V |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | RST (active-low) and RST (active-high) eliminate need for external inverters in mixed-logic systems |
| Adjustable power-on reset timeout | CPOR pin enables precise tPOR tuning from 200ms to seconds using a single external capacitor |
| Ultra-low quiescent current | 10µA max at 3V reduces battery drain in always-on supervision circuits |
| Immunity to supply transients | Hysteresis (29mV at 2.92V) and internal filtering prevent false resets from noise or brief droops |
| Debounced manual reset input | MR pin includes hardware debounce and 20kΩ pull-up, enabling direct push-button connection without RC network |
Applications
| Battery-Powered Portable Devices | Industrial Microcontroller Systems |
|---|---|
Use Scenario: Supervising 3.0V main rail and lithium coin-cell backup in handheld test equipment. IC Role / Device Role / Timing Role: ISL88708IB829Z-TK monitors VDD for brownout and PFI for battery voltage decay, asserting dual reset signals to halt MCU execution until stable power returns. Use Value: Prevents data corruption during low-battery shutdown and enables graceful state save before power loss. |
Use Scenario: Ensuring deterministic startup and runtime watchdog recovery in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: ISL88708IB829Z-TK provides 200ms+ power-on reset hold-off and 1.6s watchdog supervision of PLC firmware execution cycles. Use Value: Guarantees clean initialization of I/O registers and prevents runaway code from disabling safety-critical outputs. |
| Notebook/Embedded Computer BIOS | Communications Equipment Power Management |
Use Scenario: Managing reset sequencing for Intel/AMD embedded processors and companion chips during cold boot. IC Role / Device Role / Timing Role: ISL88708IB829Z-TK asserts synchronized RST/RST signals after VDD stabilizes above 2.92V and holds reset for ≥140ms. Use Value: Eliminates race conditions between CPU, memory, and chipset initialization by enforcing minimum reset pulse width. |
Use Scenario: Monitoring primary 3.3V supply and secondary -48V telecom line interface voltage in base station modules. IC Role / Device Role / Timing Role: ISL88708IB829Z-TK uses PFI with resistor divider to detect -48V presence; PFO drives MR to force full-system reset on line failure. Use Value: Enables automatic failover and rapid fault isolation without software intervention in carrier-grade infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR29-T | Single active-low reset output; no RST, no CPOR, no PFI/PFO; 2.93V threshold; 1.6s watchdog | Lacks auxiliary voltage monitoring and adjustable POR; suitable only where dual reset or battery warning not required | Select when board space is constrained and only basic 3.0V supervision + watchdog is needed |
| TPS3808G33DBVR | Single active-low reset; 3.3V threshold; no PFI/PFO; no watchdog; 200ms fixed POR; 1.6µA IQ | No watchdog or auxiliary monitoring; optimized for ultra-low-power 3.3V-only systems | Choose for energy-harvesting or long-life battery applications where watchdog and PFI are unnecessary |
Compared with MAX6326UR29-T and TPS3808G33DBVR, the ISL88708IB829Z-TK uniquely delivers dual-reset signaling, adjustable POR timing, and integrated power-fail detection-enabling consolidated supervision in compact, feature-rich embedded systems without adding discrete comparators or timers.
Availability
ISL88708IB829Z-TK is available at Aetrix Electronics and suitable for portable electronics, industrial microcontroller systems, notebook BIOS, and communications equipment requiring stable component supply and long-term lifecycle support.
Supply support for ISL88708IB829Z-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 (acquired Intersil in 2017) is a global leader in microcontrollers, analog, and power management solutions, serving automotive, industrial, and infrastructure markets.
The ISL88708IB829Z-TK belongs to Renesas' legacy Intersil microprocessor supervisor family, designed specifically for high-accuracy, low-power voltage monitoring and system-level reset control in battery-sensitive and noise-prone embedded applications.
FAQ
What is the exact VDD voltage threshold for ISL88708IB829Z-TK?
The ISL88708IB829Z-TK has a factory-programmed VDD threshold of 2.92V with ±1.8% accuracy (2.867V to 2.973V over temperature). This value is encoded in the part marking "I29Z" and verified per FN8092 Rev 6.00 Electrical Specifications table on page 5.
Does ISL88708IB829Z-TK support both active-high and active-low reset outputs simultaneously?
Yes, ISL88708IB829Z-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 concurrently during power-up, brownout, or manual reset, enabling direct interface with mixed-signal logic families without external inversion.
How is the power-on reset timeout adjusted on ISL88708IB829Z-TK?
The ISL88708IB829Z-TK uses the CPOR pin (pin 6) to adjust tPOR. Connecting an external capacitor from CPOR to GND extends the nominal 200ms timeout - e.g., 50pF yields ~1.4s. Stray capacitance must be minimized during PCB layout to maintain timing accuracy, as detailed in Figure 3 and page 7 of FN8092.
What is the function of the PFI and PFO pins on ISL88708IB829Z-TK?
PFI (pin 4) is an auxiliary voltage input with a 1.25V threshold; PFO (pin 5) is its open-drain output. When PFI voltage exceeds 1.25V, PFO goes high - enabling low-battery warning, power-fail detection, or presence sensing. An external resistor divider allows monitoring of voltages >1.25V, per Equation 1 on page 7 of FN8092.
Is ISL88708IB829Z-TK compatible with modern reflow soldering processes?
Yes, ISL88708IB829Z-TK is supplied in Pb-free SOIC (M8.15) packaging rated for standard reflow profiles. Unlike discontinued PDIP variants, this SOIC version meets IPC/JEDEC J-STD-020 moisture sensitivity and thermal requirements, with θJA = 110°C/W on a 4-layer board.
ISL88708IB829Z-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:
- 2.92V
- 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
ISL88708IB829Z-TK FAQ
1.How can I place an order for ISL88708IB829Z-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88708IB829Z-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 ISL88708IB829Z-TK reliable?
The price and inventory of ISL88708IB829Z-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88708IB829Z-TK is usually 5 days.
3.What payment methods are accepted for ISL88708IB829Z-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88708IB829Z-TK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL88708IB829Z-TK?
ISL88708IB829Z-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88708IB829Z-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 ISL88708IB829Z-TK?
For technical support, including ISL88708IB829Z-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88708IB829Z-TK requirements.
6.How does Aetrix verify that ISL88708IB829Z-TK is sourced from the original manufacturer or authorized distributors?
All ISL88708IB829Z-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 ISL88708IB829Z-TK meets industry standards.
7.What is the process for return or replacement of ISL88708IB829Z-TK?
All ISL88708IB829Z-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL88708IB829Z-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 ISL88708IB829Z-TK part is unused and in its original packaging.
Return procedure for ISL88708IB829Z-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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