Renesas ISL88707IB846Z-TK

Overview

ISL88707IB846Z-TK from Renesas (formerly Intersil) is a microprocessor supervisor IC with dual reset outputs (RST active-low and RST active-high), 4.64V fixed VDD threshold, 1.25V adjustable auxiliary voltage monitor (PFI/PFO), and 1.6s watchdog timer. It asserts reset during power-up, brownout, or manual trigger, and supports customizable POR delay via external CPOR capacitor - used in battery-powered industrial controllers and embedded systems requiring reliable power sequencing.

For engineers reviewing the ISL88707IB846Z-TK datasheet, ISL88707IB846Z-TK pinout, ISL88707IB846Z-TK application, or ISL88707IB846Z-TK equivalent, key selection criteria include ±1.8% VTH accuracy, 10µA max supply current at 3V, 200ms nominal POR with CPOR adjustability, dual-reset output capability, and immunity to power-supply transients.

Technical Context

The ISL88707IB846Z-TK integrates a precision bandgap reference, POR circuit with hysteresis, independent watchdog timer with 1.6s timeout, and dual-threshold monitoring (VDD at 4.64V ±1.8%, PFI at 1.25V ±40mV). Its CPOR pin enables user-defined power-on reset delay extension beyond 200ms using an external capacitor.

It features debounced MR input with 20kΩ internal pull-up, active-low and active-high complementary reset outputs, and WDO that pulls low on watchdog timeout or VDD undervoltage - without minimum pulse width requirement - distinguishing it from RST/RST which guarantee ≥140ms assertion.

Key Specifications

Pinout & Package

ISL88707IB846Z-TK is housed in an 8-lead narrow-body SOIC package (JEDEC MS-012-AA compliant, M8.15 outline), RoHS-compliant and optimized for surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326US46D3+T and TPS3808G33DBVR, the ISL88707IB846Z-TK uniquely delivers dual-polarity reset outputs, CPOR-adjustable POR delay, and integrated 1.25V auxiliary monitoring - making it optimal for complex multi-rail systems requiring coordinated power sequencing and fault detection.

Availability

ISL88707IB846Z-TK is available at Aetrix Electronics and suitable for industrial controllers, portable instrumentation, and communications equipment requiring stable component supply with long-term lifecycle support.

Supply support for ISL88707IB846Z-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 ISL88707IB846Z-TK belongs to Renesas' precision supervisor IC product line, designed specifically for robust power monitoring in battery-powered and industrial embedded systems where reliability, low power, and timing flexibility are critical.

FAQ

What is the exact VDD reset threshold voltage for ISL88707IB846Z-TK?

The ISL88707IB846Z-TK has a factory-programmed VDD threshold of 4.64V, with guaranteed accuracy of ±1.8% (4.556V to 4.724V) over temperature and supply variations. This value is laser-trimmed during production and specified in the part marking "I46Z" per the FN8092 datasheet ordering table.

Does ISL88707IB846Z-TK support adjustable power-on reset delay?

Yes, the ISL88707IB846Z-TK supports adjustable POR delay via the CPOR pin. Connecting an external capacitor from CPOR to GND extends the nominal 200ms delay - e.g., 50pF yields ~1.4s - a feature exclusive to ISL88707 and ISL88708 variants per the functional block diagram and Figure 3 in FN8092.

What are the key differences between RST and RST outputs on ISL88707IB846Z-TK?

The ISL88707IB846Z-TK provides complementary reset outputs: RST is active-low (pulled low to GND during reset), while RST is active-high (driven high to VDD). Both assert simultaneously and maintain ≥140ms minimum pulse width, enabling direct interface with mixed-voltage logic families without level-shifting components.

Can ISL88707IB846Z-TK monitor voltages other than the main VDD rail?

Yes, the ISL88707IB846Z-TK includes a dedicated PFI input with a 1.25V internal reference, allowing monitoring of auxiliary voltages such as battery level, secondary power rails, or sensor supplies. A resistor divider on PFI enables custom thresholds above 1.25V, as defined in Equation 1 of the FN8092 datasheet.

What is the watchdog timer behavior when WDI is left unconnected on ISL88707IB846Z-TK?

When WDI is floating or connected to a high-impedance (tri-stated) source, the watchdog timer is disabled. In this state, WDO remains high unless VDD falls below the 4.64V threshold - confirming that ISL88707IB846Z-TK defaults to basic power-supply supervision without watchdog intervention when WDI is unused.