Renesas X5045PIZ-4.5A

Overview

X5045PIZ-4.5A 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 4.63V ±2.5% reset threshold, 200ms reset timeout, 3.3MHz SPI interface, and block-lock EEPROM protection. It is used in industrial embedded systems requiring reliable brownout detection and nonvolatile configuration storage.

For engineers reviewing the X5045PIZ-4.5A datasheet, X5045PIZ-4.5A pinout, X5045PIZ-4.5A application, or X5045PIZ-4.5A equivalent, key selection criteria include VTRIP accuracy, watchdog timeout configurability, EEPROM endurance (1M write cycles), and compatibility with 5V microcontroller SPI buses under -40°C to +85°C operation.

Technical Context

The X5045PIZ-4.5A implements a dual-function CS/WDI pin for both chip select and watchdog input, with internal reset generation triggered by either VCC falling below 4.63V or WDI inactivity exceeding the selected timeout (200ms/600ms/1.4s or disabled). Its status register contains nonvolatile WD0/WD1 bits that retain watchdog settings across power cycles.

It uses a proprietary Direct Write™ EEPROM cell architecture enabling 1,000,000 write cycles and 100-year data retention, with block lock protection configurable via BL0/BL1 bits to secure 0%, 25%, 50%, or 100% of the 512×8-bit array. The device asserts an open-drain RESET output valid down to VCC = 1V and supports SPI clock rates up to 3.3MHz.

Key Specifications

Pinout & Package

Package: 8-lead PDIP (Plastic Dual In-line Package), Pb-free, RoHS compliant, through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361LKA29D3+ and STM802LSD-46F, X5045PIZ-4.5A uniquely combines field-reprogrammable VTRIP, 4K-bit EEPROM with block lock, and nonvolatile watchdog timeout in a single industrial-grade 8-pin PDIP - reducing component count while ensuring long-term data integrity and adaptive power supervision.

Availability

X5045PIZ-4.5A is available at Aetrix Electronics and suitable for industrial process controllers, telecom routers, medical diagnostic instruments, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X5045PIZ-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 X5045 family was designed to consolidate power supervision, watchdog safety, and nonvolatile storage into one robust component for space-constrained embedded systems operating in harsh environments.

FAQ

What is the exact reset threshold voltage for X5045PIZ-4.5A?

The X5045PIZ-4.5A has a factory-programmed VTRIP of 4.63V ±2.5%, corresponding to the "-4.5A" suffix. This value is guaranteed over temperature and can be reprogrammed to higher values using a 15–18V programming voltage applied to the WP pin and a defined SPI command sequence. The device remains functional down to VCC = 1V during reset assertion.

Does X5045PIZ-4.5A support both active-low and active-high reset outputs?

No - X5045PIZ-4.5A provides only an active-low open-drain RESET output. The datasheet confirms RESET/RESET is active-low; there is no active-high variant in this part number. An external pull-up resistor is required to generate a logic-high level when reset is inactive. The "X5045" designation specifically denotes the active-low version.

How many write cycles does the EEPROM in X5045PIZ-4.5A support?

The EEPROM in X5045PIZ-4.5A supports a minimum of 1,000,000 write cycles, enabled by Intersil's proprietary Direct Write™ cell technology. This exceeds typical 100,000-cycle EEPROMs and is validated across the full -40°C to +85°C temperature range, making X5045PIZ-4.5A suitable for high-frequency parameter logging in industrial equipment.

Can the watchdog timeout period of X5045PIZ-4.5A be changed dynamically during operation?

Yes - the watchdog timeout period of X5045PIZ-4.5A is controlled by nonvolatile WD0/WD1 bits in the status register, which can be modified via the WRSR instruction during normal operation. Once written, the new timeout setting persists across power cycles, eliminating the need for reconfiguration at each boot. Valid periods are 200ms, 600ms, 1.4s, or disabled.

What package type and lead finish does X5045PIZ-4.5A use?

X5045PIZ-4.5A uses an 8-lead PDIP (Plastic Dual In-line Package) with Pb-free plus anneal termination - 100% matte tin plating compliant with RoHS and compatible with both SnPb and Pb-free soldering processes. The "I" in "PIZ" denotes industrial temperature grade (-40°C to +85°C), and "Z" indicates Pb-free packaging.