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Renesas ISL88708IB844Z-TK
- Part No.:
- ISL88708IB844Z-TK
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL88708IB844Z-TK.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,838
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Product details
Overview
ISL88708IB844Z-TK from Renesas (formerly Intersil) is a microprocessor supervisor IC with dual reset outputs (active-high RST and active-low RST), 4.38V ±1.8% 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 systems requiring precise supply supervision and low-power operation.
For engineers reviewing the ISL88708IB844Z-TK datasheet, ISL88708IB844Z-TK pinout, ISL88708IB844Z-TK application, or ISL88708IB844Z-TK equivalent, key selection criteria include its 4.38V trip point accuracy, CPOR-adjustable 200ms+ power-on reset delay, dual RST outputs, ultra-low 10µA supply current at 3V, and immunity to power-supply transients.
Technical Context
The ISL88708IB844Z-TK integrates three core supervision functions: precision VDD monitoring with hysteresis (46mV for 4.38V variant), an independent 1.25V PFI comparator with user-adjustable threshold via external resistor divider, and a 1.6s watchdog timer cleared by WDI edge transitions. Its POR circuit ensures reliable system initialization before microprocessor execution begins.
Unlike ISL88705/88706, the ISL88708 includes both complementary RST outputs and the CPOR pin for extending tPOR beyond 200ms using an external capacitor-enabling flexible timing control in FPGA configuration or multi-rail sequencing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold | 4.38V ±1.8% - factory-trimmed trip point ensures accurate +3.3V rail supervision without external calibration |
| Supply Current | 10µA max at 3V - enables multi-year battery life in portable equipment with continuous supervision |
| Watchdog Timeout | 1.6s typical - provides sufficient margin for firmware execution loops while detecting lockups |
| PFI Threshold | 1.25V fixed reference - supports low-battery warning or auxiliary supply monitoring down to 1.25V |
| Reset Pulse Width | 140–260ms min - guarantees processor reset hold time meets ARM/Cortex and most MCU requirements |
| Operating Temp | -40°C to +85°C - qualified for industrial-grade embedded systems and computing platforms |
| Reset Valid Down To | VDD = 1V - maintains functional reset assertion during deep brownout conditions |
Pinout & Package
ISL88708IB844Z-TK is housed in an 8-lead narrow-body SOIC package (M8.15 outline), 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 |
| 2 VDD | Power Supply Input | Main supply rail monitored at 4.38V threshold; reset asserted if VDD drops below trip point or during power-up |
| 3 GND | Ground Reference | Common return path for all internal comparators, watchdog, and output drivers |
| 4 PFI | Power-Fail Input | Auxiliary voltage monitor input referenced to 1.25V; used for low-battery detection or secondary supply supervision |
| 5 PFO | Power-Fail Output | Open-drain output that goes high when PFI > 1.25V; can drive MR for automatic reset on auxiliary supply failure |
| 6 CPOR | Adjustable POR Delay Input | Capacitor connection point to extend power-on reset timeout beyond nominal 200ms (e.g., 50pF → ~1.4s) |
| 7 RST | Active-High Reset Output | Push-pull output driven high to VDD during reset; compatible with logic inputs requiring active-high assertion |
| 8 RST | Active-Low Reset Output | PMOS open-drain output pulled low during reset; supports wired-OR configurations and legacy MCU reset pins |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | RST (active-high push-pull) and RST (active-low open-drain) eliminate need for external level-shifting or inverters |
| Adjustable power-on reset delay | CPOR pin enables precise tPOR extension (e.g., 200ms → 1.4s with 50pF) for FPGA configuration or multi-voltage sequencing |
| Ultra-low quiescent current | 10µA max at 3V allows integration into always-on battery-backed subsystems without significant drain |
| Immunity to supply transients | Hysteresis (44mV) and internal filtering prevent false resets from noise or short-duration droops on VDD |
| Flexible auxiliary voltage monitoring | PFI/PFO pair supports custom thresholds >1.25V via resistor divider, enabling detection of 5V, 12V, or negative rails |
Applications
| Battery-Powered Portable Devices | Notebook/Desktop Power Management |
|---|---|
Use Scenario: Supervising main 3.3V logic rail and battery voltage in handheld medical monitors or IoT sensors. IC Role / Device Role / Timing Role: ISL88708IB844Z-TK monitors VDD for brownout and PFI for battery depletion, asserting RST/RST to halt CPU and trigger low-power mode. Use Value: 10µA supply current extends battery life; 1.25V PFI threshold enables early low-battery warning before critical shutdown. |
Use Scenario: Coordinating power sequencing between +3.3V, +5V, and +12V rails in desktop motherboard VRM circuits. IC Role / Device Role / Timing Role: ISL88708IB844Z-TK uses CPOR to extend tPOR for safe FPGA configuration time, while PFI monitors standby 5VSB rail. Use Value: Adjustable tPOR eliminates need for external RC timing networks; dual RST outputs simplify interface to multiple voltage domain controllers. |
| DSP/Microcontroller-Based Controllers | Industrial Embedded Systems |
Use Scenario: Ensuring deterministic boot in motor control DSPs where incorrect initialization causes unsafe actuator behavior. IC Role / Device Role / Timing Role: ISL88708IB844Z-TK asserts reset until VDD stabilizes above 4.38V and holds for ≥200ms, then enables watchdog monitoring of WDI toggles. Use Value: 1.6s watchdog timeout matches typical DSP instruction loop duration; reset valid down to 1V prevents spurious release during brownout recovery. |
Use Scenario: Monitoring isolated DC-DC converter outputs in programmable logic controllers (PLCs) operating in harsh environments. IC Role / Device Role / Timing Role: ISL88708IB844Z-TK supervises primary 3.3V logic supply and secondary 24V field bus supply via PFI resistor divider. Use Value: ±1.8% VDD threshold accuracy ensures compliance with IEC 61000-4-29 immunity testing; -40°C to +85°C rating supports extended temperature deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US43D3+ | Single active-low reset output; fixed 4.3V threshold; no CPOR or PFI/PFO functionality | Lacks auxiliary voltage monitoring and adjustable POR delay; suitable only for basic VDD-only supervision | Select when design requires minimal BOM count and no secondary supply monitoring or extended reset timing |
| TPS3808G33DBVR | 4.3V threshold; 200ms fixed POR; no dual RST outputs; includes enable input and watchdog disable option | Supports enable-controlled activation but omits PFI/PFO and CPOR; lower 1.6µA IQ than ISL88708IB844Z-TK | Choose for ultra-low-power applications where auxiliary monitoring and adjustable timing are unnecessary |
Compared with MAX6326US43D3+ and TPS3808G33DBVR, the ISL88708IB844Z-TK uniquely delivers dual RST outputs, CPOR-adjustable reset timing, and integrated PFI/PFO monitoring-making it optimal for designs requiring coordinated multi-rail supervision and flexible reset sequencing.
Availability
ISL88708IB844Z-TK is available at Aetrix Electronics and suitable for portable/battery-powered equipment, notebook/desktop computer systems, and industrial embedded systems requiring stable component supply and long-term lifecycle support.
Supply support for ISL88708IB844Z-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, power management, and SoC solutions, serving automotive, industrial, and infrastructure markets.
The ISL88708IB844Z-TK belongs to Renesas' precision supervisor IC product line, designed specifically for reliable power-up sequencing, brownout protection, and watchdog monitoring in resource-constrained embedded systems.
FAQ
What is the exact VDD reset threshold voltage for ISL88708IB844Z-TK?
The ISL88708IB844Z-TK has a factory-programmed VDD threshold of 4.38V, specified with ±1.8% accuracy over temperature. 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 are listed as 4.301V/4.380V/4.459V at +25°C.
Does ISL88708IB844Z-TK support both active-high and active-low reset outputs simultaneously?
Yes, ISL88708IB844Z-TK provides two independent reset outputs: pin 7 (RST) is active-high push-pull, and pin 8 (RST) is active-low open-drain. This dual-output capability is explicitly documented in the Pin Descriptions (Page 4) and Functional Block Diagram (Page 3), distinguishing it from ISL88705/88706 variants which offer only one reset output type.
How is the power-on reset timeout adjusted on ISL88708IB844Z-TK?
The ISL88708IB844Z-TK uses the CPOR pin (pin 6) to adjust power-on reset timeout. Connecting an external capacitor from CPOR to GND extends tPOR beyond the nominal 200ms - for example, a 50pF capacitor increases it to approximately 1.4s. This feature is exclusive to ISL88707 and ISL88708 variants, as stated in the "Adjusting tPOR" section (Page 7) and confirmed in the Pin Descriptions (Page 4).
What is the function of the PFI and PFO pins on ISL88708IB844Z-TK?
The PFI (pin 4) is an auxiliary voltage input referenced to a 1.25V internal comparator; when PFI falls below 1.25V, PFO (pin 5) goes low. This pair enables low-battery detection, power-fail warning, or secondary supply monitoring. The PFI threshold is adjustable above 1.25V using an external resistor divider, as shown in Figure 2 (Page 7) and detailed in the Power-Fail Detection specifications (Page 6).
What is the maximum supply current consumption of ISL88708IB844Z-TK?
The ISL88708IB844Z-TK consumes a maximum of 10µA at VDD = 3V and 19µA at VDD = 5V under watchdog-inactive conditions, as specified in the Electrical Specifications table (Page 5). This ultra-low current enables use in battery-critical applications such as portable instrumentation and always-on sensor nodes.
ISL88708IB844Z-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:
- 4.38V
- 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
ISL88708IB844Z-TK FAQ
1.How can I place an order for ISL88708IB844Z-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL88708IB844Z-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 ISL88708IB844Z-TK reliable?
The price and inventory of ISL88708IB844Z-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88708IB844Z-TK is usually 5 days.
3.What payment methods are accepted for ISL88708IB844Z-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL88708IB844Z-TK transactions.
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4.How is shipping managed for ISL88708IB844Z-TK?
ISL88708IB844Z-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL88708IB844Z-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 ISL88708IB844Z-TK?
For technical support, including ISL88708IB844Z-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88708IB844Z-TK requirements.
6.How does Aetrix verify that ISL88708IB844Z-TK is sourced from the original manufacturer or authorized distributors?
All ISL88708IB844Z-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 ISL88708IB844Z-TK meets industry standards.
7.What is the process for return or replacement of ISL88708IB844Z-TK?
All ISL88708IB844Z-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL88708IB844Z-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 ISL88708IB844Z-TK part is unused and in its original packaging.
Return procedure for ISL88708IB844Z-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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