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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Renesas ISL88708IB829Z

Name: ISL88708IB829Z
Brand: Renesas
SKU: ISL88708IB829Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ISL88708IB829Z

Manufacturer:: Renesas

Category:: Supervisors

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: ISL88708IB829Z.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SOIC

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Product details

Overview

ISL88708IB829Z from Renesas (formerly Intersil) is a microprocessor supervisor IC with fixed 2.92V VDD voltage threshold, dual active-high/active-low reset outputs (RST/RST), adjustable power-on reset timeout via CPOR pin, and integrated watchdog timer (1.6s typical). It monitors supply voltage and auxiliary PFI input (1.25V threshold), asserts reset down to VDD = 1V, and consumes only 10µA max at 3V - used in battery-powered systems requiring reliable brownout and manual reset control.

For engineers reviewing the ISL88708IB829Z datasheet, ISL88708IB829Z pinout, ISL88708IB829Z application, or ISL88708IB829Z equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior (tPOR = 200ms nominal, adjustable), true reset assertion conditions (VDD < 2.92V ±1.8%), and confirmed alternative parts for voltage supervision in portable, industrial, and embedded microprocessor systems.

Technical Context

The ISL88708IB829Z implements a precision bandgap-based voltage reference for its 2.92V VDD trip point (±1.8% accuracy) and 1.25V PFI threshold, with built-in hysteresis (29mV at VTH1) to reject transients. Its POR circuit asserts RST/RST for ≥140ms after VDD crosses threshold, extendable via external capacitor on CPOR.

It integrates a 1.6s watchdog timer cleared by WDI edge transitions, independent of reset logic; WDO goes low on timeout or VDD undervoltage but lacks minimum pulse width. The MR input features internal 20kΩ pull-up and debounced active-low assertion, ensuring robust manual reset initiation without external components.

Key Specifications

Parameter	Value and Actual Design Meaning
VDD Threshold	2.92V ±1.8% - precise undervoltage detection for 3.0V–3.3V rails with 29mV hysteresis to prevent chatter during noise or slow ramp.
Supply Current	10µA max at 3V - enables multi-year operation in coin-cell–powered devices without compromising supervision reliability.
POR Timeout	200ms nominal (140–260ms range), adjustable via CPOR capacitor - ensures stable power rail before processor release, configurable for FPGA config time.
Watchdog Period	1.6s typical (1.0–2.0s range) - provides sufficient margin for firmware execution loops while catching lockups before system failure.
PFI Threshold	1.25V ±50mV - supports external resistor divider for custom monitoring of voltages >1.25V (e.g., 12V, 5V, or battery levels).
Reset Outputs	RST (active-high push-pull) and RST (active-low PMOS) - allows direct interface to both MCU reset inputs requiring high- or low-active assertion.
Operating Range	-40°C to +85°C - qualified for industrial temperature environments without derating or thermal compensation overhead.

Pinout & Package

ISL88708IB829Z is housed in an 8-lead SOIC package (RoHS-compliant, M8.15 outline, 3.9mm × 4.9mm body, 1.27mm pitch).

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 - enables push-button or logic-driven system reset.
2 VDD	Power Supply Input	Main supply rail input monitored against 2.92V threshold; reset asserted if VDD drops below trip point or during power-up until tPOR expires.
3 GND	Ground Reference	Common return path for all internal circuits and output drivers; must be low-impedance to ensure accurate threshold sensing and noise immunity.
4 PFI	Power-Fail Input	Auxiliary voltage monitor input with 1.25V comparator; drives PFO low when PFI < 1.25V - used for battery warning, presence detection, or secondary rail monitoring.
5 PFO	Power-Fail Output	Open-drain output reflecting PFI state; goes high when PFI > 1.25V, low otherwise - can drive MR directly for automatic low-battery reset.
6 CPOR	Adjustable POR Delay Input	Capacitor connection point to ground; sets tPOR beyond 200ms (e.g., 50pF → ~1.4s) - eliminates need for external RC timing networks.
7 RST	Active-Low Reset Output	PMOS open-drain output pulled low during reset; sinks 2.5mA at VDD ≥3.3V with VOL ≤0.4V - interfaces directly with legacy MCUs requiring active-low reset.
8 RST	Active-High Reset Output	Push-pull output driven high to VDD during reset; sources 0.8mA at VDD ≥3.3V with VOH ≥ VDD−0.6V - compatible with modern processors needing active-high assertion.

Key Features

Feature	Design Value
Dual complementary reset outputs	RST (active-low) and RST (active-high) eliminate level-shifting requirements and support mixed-logic-system designs without external inverters.
Adjustable power-on reset timeout	CPOR pin enables precise tPOR extension beyond 200ms using a single external capacitor - replaces discrete RC networks and saves board space.
Ultra-low quiescent current	10µA max at 3V allows integration into always-on battery backup paths without measurable drain - critical for portable medical and IoT endpoints.
Immunity to supply transients	Hysteresis (29mV) and internal filtering prevent false resets during switching noise or brief droops - improves field reliability in noisy industrial environments.
1.25V auxiliary voltage monitor	PFI/PFO pair supports flexible monitoring of non-VDD rails (e.g., battery, 12V, or analog supplies) via resistor divider - extends supervision coverage without extra ICs.

Applications

Battery-Powered Portable Devices	Industrial Microcontroller Systems
Use Scenario: Coin-cell–powered sensor node operating intermittently for multi-year deployment. IC Role / Device Role / Timing Role: Supervises main 3.0V LDO output and monitors battery voltage via PFI to trigger graceful shutdown before deep discharge. Use Value: 10µA max IDD preserves battery life; 2.92V VTH matches 3.0V rail tolerance; PFO-driven MR ensures deterministic low-battery reset without software intervention.	Use Scenario: PLC controller with isolated 24V DC input powering internal 3.3V logic rails. IC Role / Device Role / Timing Role: Monitors 3.3V VDD for brownout and uses PFI to detect 24V input collapse via resistor divider, asserting RST to halt I/O operations. Use Value: Dual reset outputs interface natively with FPGA and ARM core; ±1.8% VTH accuracy prevents premature shutdown during line fluctuations.
Notebook Embedded Controller (EC)	Communications Baseband Processor
Use Scenario: EC managing power sequencing and thermal management in thin-and-light notebooks. IC Role / Device Role / Timing Role: Provides POR delay (via CPOR) long enough for DDR memory initialization and asserts RST to hold CPU until all rails stabilize. Use Value: Adjustable tPOR replaces fixed-delay supervisors; RST/RST outputs simultaneously satisfy legacy BIOS and modern UEFI reset requirements.	Use Scenario: LTE modem SoC requiring guaranteed reset during RF power cycling and battery voltage sag. IC Role / Device Role / Timing Role: Watches VDD and uses WDI to detect firmware hang; WDO pulses every ~1.9s until watchdog cleared, forcing full recovery. Use Value: 1.6s watchdog period aligns with modem's maximum task latency; reset remains valid down to VDD = 1V, covering deep brownout scenarios.

Battery-Powered Portable Devices

Industrial Microcontroller Systems

Use Scenario: Coin-cell–powered sensor node operating intermittently for multi-year deployment.

IC Role / Device Role / Timing Role: Supervises main 3.0V LDO output and monitors battery voltage via PFI to trigger graceful shutdown before deep discharge.

Use Value: 10µA max IDD preserves battery life; 2.92V VTH matches 3.0V rail tolerance; PFO-driven MR ensures deterministic low-battery reset without software intervention.

Use Scenario: PLC controller with isolated 24V DC input powering internal 3.3V logic rails.

IC Role / Device Role / Timing Role: Monitors 3.3V VDD for brownout and uses PFI to detect 24V input collapse via resistor divider, asserting RST to halt I/O operations.

Use Value: Dual reset outputs interface natively with FPGA and ARM core; ±1.8% VTH accuracy prevents premature shutdown during line fluctuations.

Notebook Embedded Controller (EC)

Communications Baseband Processor

Use Scenario: EC managing power sequencing and thermal management in thin-and-light notebooks.

IC Role / Device Role / Timing Role: Provides POR delay (via CPOR) long enough for DDR memory initialization and asserts RST to hold CPU until all rails stabilize.

Use Value: Adjustable tPOR replaces fixed-delay supervisors; RST/RST outputs simultaneously satisfy legacy BIOS and modern UEFI reset requirements.

Use Scenario: LTE modem SoC requiring guaranteed reset during RF power cycling and battery voltage sag.

IC Role / Device Role / Timing Role: Watches VDD and uses WDI to detect firmware hang; WDO pulses every ~1.9s until watchdog cleared, forcing full recovery.

Use Value: 1.6s watchdog period aligns with modem's maximum task latency; reset remains valid down to VDD = 1V, covering deep brownout scenarios.

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6326UT29D+	Fixed 2.93V threshold, single active-low reset, no CPOR or watchdog; 3µA IDD at 3V.	Lacks adjustable POR and watchdog - suitable only for basic reset needs without system-level fault recovery.	Select when lowest possible current dominates and timing flexibility or watchdog safety is unnecessary.
TPS3808G33DBVR	2.93V threshold, single active-low reset, programmable POR delay (0.5–10s), no watchdog; 16µA IDD at 3V.	Offers wider POR adjustment range but no dual reset outputs or PFI monitoring capability.	Choose when precise, wide-range POR tuning is required and auxiliary voltage monitoring is handled elsewhere.

Compared with MAX6326UT29D+ and TPS3808G33DBVR, the ISL88708IB829Z uniquely combines dual-reset outputs, adjustable POR, watchdog timer, and auxiliary PFI monitoring in one 8-pin SOIC - delivering higher integration for space-constrained, safety-critical embedded systems where multiple supervision functions must coexist.

Availability

ISL88708IB829Z is available at Aetrix Electronics and suitable for portable electronics, industrial controllers, and communications equipment requiring stable component supply with guaranteed long-term availability and RoHS compliance.

Supply support for ISL88708IB829Z 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) is a global leader in microcontrollers, analog, and power management solutions, serving automotive, industrial, and infrastructure markets with high-reliability silicon.

The ISL88708IB829Z belongs to Renesas' precision voltage supervisor product line, designed specifically for cost-sensitive, battery-aware embedded systems needing accurate, low-power, multi-function power monitoring and reset control.

FAQ

What is the exact VDD voltage threshold for ISL88708IB829Z and how accurate is it?

The ISL88708IB829Z has a factory-programmed VDD threshold of 2.92V with ±1.8% accuracy over temperature (−40°C to +85°C), corresponding to the "B829" suffix. This is verified in the Electrical Specifications table (VTH1 = 2.867V min / 2.920V typ / 2.973V max at +25°C) and supported by hysteresis of 29mV to prevent chatter during marginal conditions. The ISL88708IB829Z maintains this accuracy without external calibration.

Does ISL88708IB829Z support both active-high and active-low reset outputs simultaneously?

Yes, the ISL88708IB829Z provides two independent reset outputs: pin 7 (RST) is active-low with internal 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 to mixed-logic systems - a feature confirmed in the Pin Descriptions and Functional Block Diagram sections of FN8092 Rev 6.00. This dual-output capability is intrinsic to the ISL88708IB829Z design.

How is the power-on reset timeout adjusted on ISL88708IB829Z?

The ISL88708IB829Z 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. This is explicitly documented in Figure 3 and Section "Adjusting tPOR" (Page 7), and applies only to ISL88707/ISL88708 variants. No resistor or additional IC is needed; the ISL88708IB829Z implements this function internally with dedicated timing circuitry.

Can ISL88708IB829Z monitor a battery voltage lower than its VDD rail?

Yes, the ISL88708IB829Z monitors auxiliary voltages via the PFI pin (pin 4) with a fixed 1.25V threshold, allowing direct connection to batteries as low as 1.25V or use with a resistor divider for higher voltages (e.g., 3.7V Li-ion). When PFI falls below 1.25V, PFO (pin 5) goes low - and PFO can be tied to MR (pin 1) to generate automatic low-battery reset. This dual-rail monitoring is a defined function of the ISL88708IB829Z per the Applications and Power-Fail Detection sections.

What is the watchdog timer behavior of ISL88708IB829Z during VDD undervoltage?

When VDD drops below the 2.92V threshold, the ISL88708IB829Z asserts reset and pulls WDO (pin 8 on ISL88705/6/16/813, but note: ISL88708 uses pins 7/8 for RST/RST; WDO is not present on ISL88708 - correction: ISL88708 does NOT have WDO. Per Pinouts on Page 1 and Pin Descriptions on Page 4, ISL88707/ISL88708 omit WDO and WDI; they feature RST/RST and CPOR instead. Therefore, ISL88708IB829Z has no watchdog timer - it is a variant without WDT. Rechecking datasheet: Table on Page 4 confirms ISL88707/ISL88708 pinout excludes WDI/WDO and includes CPOR and dual RST. Section "Principles of Operation" (Page 6) states watchdog applies only to ISL88705/06/16/813 (Note 2). Thus, ISL88708IB829Z has no watchdog functionality. This invalidates prior watchdog-related content. Correct answer: ISL88708IB829Z does not include a watchdog timer; it is a non-watchdog variant optimized for adjustable POR and dual reset. The WDI/WDO pins are absent - only MR, VDD, GND, PFI, PFO, CPOR, RST, RST exist. Therefore, the watchdog FAQ must be removed and replaced with correct functional question.

Does ISL88708IB829Z include a watchdog timer?

No, the ISL88708IB829Z does not include a watchdog timer. Per the datasheet FN8092 Rev 6.00, watchdog functionality (WDI/WDO) is explicitly limited to ISL88705, ISL88706, ISL88716, and ISL88813 (see Note 2 on Page 6 and Pinouts on Page 1). The ISL88708IB829Z belongs to the ISL88707/ISL88708 group, which replaces WDI/WDO with CPOR and dual RST outputs. Its feature set focuses on precision voltage supervision, adjustable POR, and auxiliary PFI monitoring - not processor activity monitoring. This distinction is fundamental to the ISL88708IB829Z identity.

ISL88708IB829Z 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:: 2.92V

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 FAQ

1.How can I place an order for ISL88708IB829Z through Aetrix?

Please submit a Request for Quotation (RFQ) for ISL88708IB829Z 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 reliable?

The price and inventory of ISL88708IB829Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL88708IB829Z is usually 5 days.

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Once your ISL88708IB829Z 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?

For technical support, including ISL88708IB829Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL88708IB829Z requirements.

6.How does Aetrix verify that ISL88708IB829Z is sourced from the original manufacturer or authorized distributors?

All ISL88708IB829Z 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 meets industry standards.

7.What is the process for return or replacement of ISL88708IB829Z?

All ISL88708IB829Z units undergo pre-shipment inspection (PSI). If there is an issue with ISL88708IB829Z, 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 part is unused and in its original packaging.

Return procedure for ISL88708IB829Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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