Renesas X4005M8IZ-4.5A

Overview

X4005M8IZ-4.5A from Intersil is a CPU supervisor IC integrating power-on reset control, watchdog timer, and supply voltage supervision in an 8-lead MSOP package. It provides active-high RESET output, supports 4.5V to 5.5V VCC operation, features factory-set 4.62V nominal VTRIP threshold, and operates across –40°C to +85°C for industrial embedded systems requiring reliable microcontroller protection.

For engineers reviewing the X4005M8IZ-4.5A datasheet, X4005M8IZ-4.5A pinout, X4005M8IZ-4.5A application, or X4005M8IZ-4.5A equivalent, this device delivers configurable watchdog timeout (200ms/600ms/1.4s/off), programmable VTRIP voltage, I²C interface at 400kHz, low-power standby current (800nA with WDT off), and robust brownout detection down to 1V VCC - all critical for fail-safe MCU boot and runtime monitoring.

Technical Context

The X4005M8IZ-4.5A implements a hardware-based power-on reset generator with 200ms nominal release delay after VCC exceeds VTRIP, and a dedicated watchdog circuit that monitors SDA/SCL activity via I²C start/stop transitions. Its nonvolatile control register stores WD1/WD0 bits defining timeout period and supports write-protection via WP pin.

Voltage supervision uses precision bandgap-based threshold detection with five standard trip points; the X4005M8IZ-4.5A is factory-trimmed to 4.62V (4.5–4.75V range) and allows field reprogramming of VTRIP using 15–18V on WP and precise VCC biasing - a capability confirmed for this specific variant in the datasheet's Ordering Information and VTRIP Programming sections.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (3.0mm width), RoHS-compliant, Pb-free, M8.118 drawing. Pin 1 and 2 are NC (no internal connection); pin 3 is active-high RESET output; pins 5 (SDA) and 6 (SCL) implement I²C communication; pin 7 (WP) enables write protection of watchdog settings.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361KA29+T and TPS3808G33DBVR, the X4005M8IZ-4.5A uniquely combines factory-trimmed 4.62V VTRIP, I²C-configurable watchdog, and field-programmable reset threshold - enabling adaptive system-level supervision without hardware changes.

Availability

X4005M8IZ-4.5A is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic equipment, telecom remote radio units, smart grid metering terminals, and automotive body control modules requiring stable component supply over extended product lifecycles.

Supply support for X4005M8IZ-4.5A 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

Intersil (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, computing, and communications markets.

The X4005 family was designed specifically for robust microcontroller supervision in harsh environments - integrating reset, watchdog, and voltage monitoring into a single I²C-controllable device to reduce BOM count and improve system reliability.

FAQ

What is the reset output polarity and type for X4005M8IZ-4.5A?

The X4005M8IZ-4.5A features an active-high open-drain RESET output (pin 3). This means the signal is pulled low internally when asserted and requires an external pull-up resistor to VCC. The active-high behavior distinguishes it from the X4003 variant, which provides active-low RESET. This configuration simplifies interfacing with MCUs that expect high-active reset signals and supports wired-OR connections for multi-supervisor systems.

Can the watchdog timeout period of X4005M8IZ-4.5A be changed after power-up?

Yes, the watchdog timeout period of X4005M8IZ-4.5A can be changed after power-up via its I²C interface. The WD1 and WD0 bits in the nonvolatile control register determine the timeout (200ms/600ms/1.4s/off), and these bits retain their value across power cycles. Configuration requires a three-step write sequence to the control register at address 1FFh, with WP pin held LOW during programming. Once set, the timeout remains until explicitly rewritten.

What is the minimum VCC level at which X4005M8IZ-4.5A guarantees valid RESET assertion?

X4005M8IZ-4.5A guarantees valid RESET assertion down to VCC = 1V, as specified in the datasheet's "Low VCC detection and reset assertion" feature list. This ensures the reset signal remains active and predictable even during deep brownout conditions or slow power-down sequences, preventing the MCU from entering undefined states before full power loss.

Does X4005M8IZ-4.5A support VTRIP reprogramming in-circuit?

Yes, X4005M8IZ-4.5A supports in-circuit VTRIP reprogramming using a defined procedure: apply the desired VTRIP voltage to VCC, tie WP to 15–18V, then write 00h to address 01h. The operation completes after the stop condition and requires no device removal or special programmers. This capability is explicitly documented for the X4005 series and applies to the X4005M8IZ-4.5A variant per the ordering table and VTRIP programming section.

What package and lead finish does X4005M8IZ-4.5A use?

X4005M8IZ-4.5A uses an 8-lead MSOP package (3.0mm width) with Pb-free (RoHS-compliant) matte tin plating and anneal e3 termination finish. The "Z" suffix in the part number confirms RoHS compliance, and the "I" suffix denotes the –40°C to +85°C industrial temperature grade. Package drawing number is M8.118, and the device is rated for standard Pb-free reflow profiles per JEDEC J-STD-020.