Renesas X5043PIZ-2.7

Overview

X5043PIZ-2.7 from Intersil (now Renesas) is a CPU supervisor IC integrating power-on reset, watchdog timer, supply voltage supervision, and 4K-bit SPI EEPROM in a single 8-lead PDIP package. It features a 2.85–3.0 V reset threshold, -40°C to +85°C industrial temperature range, and active-low open-drain RESET output. It is used in embedded systems requiring reliable power sequencing and nonvolatile configuration storage, such as industrial controllers and network edge devices.

For engineers reviewing the X5043PIZ-2.7 datasheet, X5043PIZ-2.7 pinout, X5043PIZ-2.7 application, or X5043PIZ-2.7 equivalent, key selection criteria include its programmable VTRIP threshold, 200 ms reset timeout, 3.3 MHz SPI interface, block-lock EEPROM protection, and watchdog timeout options of 200 ms / 600 ms / 1.4 s - all critical for brownout resilience and firmware recovery in resource-constrained microcontroller systems.

Technical Context

The X5043PIZ-2.7 implements a dual-function CS/WDI pin that serves both chip select and watchdog input, with falling-edge-triggered watchdog reset. Its internal voltage detector asserts RESET when VCC drops below 2.85 V (±2.5%), holding it active until VCC exceeds the trip point for 200 ms and stabilizes above 1 V.

EEPROM operation uses SPI Mode 0 (CPOL = 0, CPHA = 0), supports 16-byte page writes with 5 ms typical write cycle time, and incorporates Direct Write™ memory cells rated for 1 million write cycles and 100-year data retention. Block lock protection is controlled via nonvolatile status register bits BL0/BL1, enabling selective write-protection of 0%, 25%, 50%, or 100% of the 512 × 8-bit array.

Key Specifications

Pinout & Package

Package: 8-lead PDIP (Plastic Dual In-line Package), RoHS-compliant Pb-free plus anneal finish, 0.3 inch body width.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361KA29+T and MCP9808-E/P, the X5043PIZ-2.7 uniquely integrates adjustable reset, watchdog, and high-endurance EEPROM in one industrial-grade package - making it irreplaceable for designs requiring coordinated power management and persistent configuration in constrained environments.

Availability

X5043PIZ-2.7 is available at Aetrix Electronics and suitable for industrial process controllers, network edge routers, medical handheld diagnostics, and battery-powered data loggers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X5043PIZ-2.7 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 (formerly Intersil) is a global semiconductor leader specializing in microcontrollers, analog, and power management solutions for industrial, automotive, and infrastructure markets.

The X5043 family was designed to consolidate power supervision, watchdog safety, and configuration storage into a single IC - targeting cost-sensitive, space-constrained embedded systems needing high reliability and long-term data integrity.

FAQ

What is the exact reset voltage threshold for X5043PIZ-2.7?

The X5043PIZ-2.7 has a factory-programmed VTRIP threshold of 2.85–3.0 V (±2.5%). This value is guaranteed over temperature and supply variation and can be reprogrammed in-system using a 15–18 V pulse on the WP pin. The reset remains asserted until VCC rises above this threshold for 200 ms and stabilizes above 1 V - ensuring robust brownout recovery for the X5043PIZ-2.7.

Does X5043PIZ-2.7 support SPI Mode 0 or Mode 3?

The X5043PIZ-2.7 operates exclusively in SPI Mode 0 (CPOL = 0, CPHA = 0): clock idles low, data sampled on the rising edge of SCK and shifted out on the falling edge. This is confirmed in the FN8126 datasheet timing diagrams and instruction set description. Any attempt to use Mode 3 will result in communication failure with the X5043PIZ-2.7.

How many watchdog timeout options does X5043PIZ-2.7 provide, and how are they selected?

The X5043PIZ-2.7 offers three selectable watchdog timeout periods: 200 ms, 600 ms, and 1.4 s. These are configured via nonvolatile WD0/WD1 bits in the status register using the WRSR instruction. Once written, the setting persists across power cycles - a key design feature of the X5043PIZ-2.7 that enables deterministic fault recovery without MCU intervention.

Can the EEPROM in X5043PIZ-2.7 be fully write-protected, and how is it enforced?

Yes, the X5043PIZ-2.7 supports full EEPROM write protection via BL0/BL1 bits in the status register. When set to '11', the entire 512 × 8-bit array is locked - readable but unwritable. Protection is enforced by hardware logic that ignores write commands to locked pages, regardless of WREN state or WP pin level. This dual-layer enforcement is a core security feature of the X5043PIZ-2.7.

Is X5043PIZ-2.7 pin-compatible with X5045PIZ-2.7?

Yes, X5043PIZ-2.7 and X5045PIZ-2.7 share identical pinout, package, and electrical specifications - differing only in RESET polarity (X5043 = active-low, X5045 = active-high). Both parts use the same 8-lead PDIP footprint and SPI interface protocol. Designers may substitute X5045PIZ-2.7 for X5043PIZ-2.7 with only a schematic-level polarity change on the RESET net.