Renesas X5043PIZ

Overview

X5043PIZ from Intersil is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 4Kbit SPI EEPROM in a single 8-lead PDIP package. It features a 4.63V ±2.5% reset threshold, selectable 200ms/600ms/1.4s watchdog timeout, and 3.3MHz SPI interface - used for reliable system initialization and data retention in industrial microcontroller systems.

For engineers reviewing the X5043PIZ datasheet, X5043PIZ pinout, X5043PIZ application, or X5043PIZ equivalent, key selection criteria include its -40°C to +85°C industrial temperature range, reprogrammable VTRIP voltage, block-lock EEPROM protection, and active-low RESET output with 200ms timeout release delay after VCC stabilization.

Technical Context

The X5043PIZ implements a dual-function CS/WDI pin that serves as both chip select and watchdog input - toggling CS within the selected timeout interval resets the watchdog. Its internal power-on reset circuit asserts RESET until VCC exceeds 4.63V and remains stable for 200ms (typical), ensuring safe microprocessor startup.

Voltage supervision uses an adjustable comparator-based VTRIP circuit; factory-set to 4.63V but reprogrammable via high-voltage sequence (VP = 15–18V applied to WP) to custom thresholds. The 4Kbit EEPROM array (512 × 8) supports 16-byte page writes with 5ms typical write cycle time and 1M endurance using Direct Write™ technology.

Key Specifications

Pinout & Package

Package: 8-lead PDIP (Plastic Dual In-line Package), Pb-free plus anneal (RoHS compliant), body width 0.300", lead pitch 0.100".

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361LKA29+T and STM802SWX6F, the X5043PIZ uniquely combines reprogrammable reset voltage, 1M-endurance SPI EEPROM with hardware block lock, and industrial temperature rating - delivering higher integration, longer data retention, and greater field adaptability in a single PDIP package.

Availability

X5043PIZ is available at Aetrix Electronics and suitable for industrial process control, network infrastructure, and embedded instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X5043PIZ 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 manufacturer specializing in precision analog, power management, and interface solutions for industrial, communications, and computing markets.

The X5043PIZ belongs to Intersil's CPU Supervisor family, designed to reduce system complexity by merging reset, watchdog, voltage monitoring, and nonvolatile memory functions into one IC for microcontroller-based equipment.

FAQ

What is the factory-default VTRIP voltage for the X5043PIZ?

The X5043PIZ ships with a factory-default VTRIP voltage of 4.63V ±2.5%. This threshold is permanently stored in nonvolatile circuitry and remains unchanged across power cycles unless explicitly reprogrammed using the high-voltage VTRIP programming sequence described in the FN8126 datasheet. The X5043PIZ-4.5A suffix confirms this 4.63V setting.

Does the X5043PIZ support both active-low and active-high reset outputs?

No - the X5043PIZ provides only an active-low RESET output (open-drain). The X5045 variant offers active-high RESET; however, the X5043PIZ is strictly active-low. Its RESET pin asserts low during power-on reset, brownout, or watchdog timeout, and requires an external pull-up resistor to VCC for proper logic level translation.

How does the watchdog timer in the X5043PIZ interact with the CS/WDI pin?

The CS/WDI pin serves dual roles: chip select during SPI communication and watchdog input during normal operation. To prevent watchdog timeout, the host microcontroller must toggle CS/WDI from HIGH to LOW at least once per selected timeout interval (200ms/600ms/1.4s). A falling edge on CS/WDI resets the watchdog counter; failure to do so causes RESET assertion.

Can the EEPROM memory in the X5043PIZ be partially protected against writes?

Yes - the X5043PIZ implements Block Lock™ protection controlled by nonvolatile BL0/BL1 bits in the status register. These bits allow selective write protection of 0%, 25%, 50%, or 100% of the 4Kbit EEPROM array (addresses $000–$1FF). Protection persists across power cycles and can only be modified when both the Write Enable Latch is set and WP is high.

What is the maximum SPI clock frequency supported by the X5043PIZ?

The X5043PIZ supports a maximum SPI clock frequency of 3.3MHz under recommended operating conditions (VCC = 4.5V to 5.5V). This timing is validated across the full -40°C to +85°C temperature range and enables efficient EEPROM read/write operations and status register access without requiring clock dividers or timing margin adjustments.