Renesas X5043PZ-4.5A

Overview

X5043PZ-4.5A from Intersil (now Renesas) is a 4K-bit SPI CPU supervisor IC integrating power-on reset, watchdog timer, supply voltage supervision, and block-lock protected EEPROM in an 8-pin PDIP package. It features a 4.63V ±2.5% V_TRIP, 200ms reset timeout, and 3.3MHz SPI interface - used in industrial process controllers to ensure deterministic boot and brownout recovery.

For engineers reviewing the X5043PZ-4.5A datasheet, X5043PZ-4.5A pinout, X5043PZ-4.5A application, or X5043PZ-4.5A equivalent, key selection considerations include its factory-programmed 4.63V reset threshold, nonvolatile watchdog timeout configuration, 100,000 write-cycle EEPROM endurance, and active-low open-drain RESET output compatible with 5V microcontrollers.

Technical Context

The X5043PZ-4.5A implements a dual-function CS/WDI pin for both SPI chip select and watchdog input, with internal timing logic that resets the watchdog on each falling edge. Its reset generation circuit asserts RESET until V_CC exceeds 4.63V for 200ms and remains valid down to 1V.

EEPROM operation uses Intersil's Direct Write™ cell architecture with 16-byte page writes and 5ms typical write cycle time. Block lock protection is controlled by nonvolatile BL0/BL1 bits in the status register, enabling selective write-protection of 0%, 25%, 50%, or 100% of the 512×8 memory array.

Key Specifications

Pinout & Package

Package: 8-lead PDIP (Plastic Dual In-line Package), Pb-free, RoHS compliant, 0°C to +70°C operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX690TSA+ and MCP809T-460I/P, the X5043PZ-4.5A uniquely integrates reset, watchdog, and protected EEPROM in one 8-pin PDIP - eliminating interconnects, reducing layout complexity, and guaranteeing timing coherence between supervision functions and memory access.

Availability

X5043PZ-4.5A is available at Aetrix Electronics and suitable for industrial process controllers, network infrastructure routers, desktop computer motherboards, and battery-powered test equipment requiring stable component supply across extended product lifecycles.

Supply support for X5043PZ-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

Renesas Electronics (formerly Intersil) is a global semiconductor leader specializing in microcontrollers, analog, power management, and timing solutions for industrial, automotive, and communications markets.

The X5043PZ-4.5A belongs to Renesas' legacy CPU supervisor family designed to consolidate power monitoring, reset control, and nonvolatile storage into compact packages for resource-constrained embedded systems.

FAQ

What is the factory-programmed reset threshold voltage for X5043PZ-4.5A?

The X5043PZ-4.5A ships with a factory-programmed V_TRIP of 4.63V ±2.5%, optimized for 5V systems. This value is stored in nonvolatile circuitry and remains stable over temperature and time unless reprogrammed using the high-voltage VTRIP adjustment sequence specified in the FN8126 datasheet. The X5043PZ-4.5A maintains this threshold across its full 0°C to +70°C operating range.

Does X5043PZ-4.5A support both active-low and active-high reset outputs?

No - the X5043PZ-4.5A provides only an active-low open-drain RESET output. It does not offer an active-high variant; that function is implemented in the pin-compatible X5045 series (e.g., X5045PZ-4.5A). The X5043PZ-4.5A RESET pin requires an external pull-up resistor to V_CC and sinks current when asserted, making it compatible with standard 5V microcontroller reset inputs.

Can the watchdog timeout period of X5043PZ-4.5A be changed after power-up?

Yes - the watchdog timeout period of X5043PZ-4.5A is configured via nonvolatile WD0/WD1 bits in the status register and can be modified in-system using the WRSR instruction. Once written, the setting persists through power cycles. The X5043PZ-4.5A supports four selectable timeouts: disabled (factory default), 200ms, 600ms, or 1.4s - enabling runtime adaptation to different firmware execution profiles.

What EEPROM organization does X5043PZ-4.5A use, and how is block lock protection applied?

The X5043PZ-4.5A contains a 4K-bit (512 × 8) serial EEPROM array organized in 16-byte pages. Block lock protection is controlled by nonvolatile BL0/BL1 bits: 00 = no protection, 01 = upper quarter ($180–$1FF), 10 = upper half ($100–$1FF), 11 = full array ($000–$1FF). This protection applies to writes only; read access remains unrestricted. The X5043PZ-4.5A enforces lock state regardless of WP pin or WREN latch status.

Is X5043PZ-4.5A RoHS compliant and what is its lead finish?

Yes - X5043PZ-4.5A is RoHS compliant and uses Intersil's "Pb-Free Plus Anneal" construction: 100% matte tin plate termination finish, Pb-free molding compound, and Pb-free die attach materials. It meets IPC/JEDEC J-STD-020 reflow requirements for lead-free soldering and is compatible with both SnPb and Pb-free assembly processes. The X5043PZ-4.5A is rated MSL 1 with unlimited floor life under dry pack conditions.