Renesas X5045PIZ

Overview

X5045PIZ from Intersil (now Renesas) is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 4K-bit SPI EEPROM in a single 8-lead PDIP package. It provides active-low RESET output, supports 2.7V–5.5V VCC range, features factory-default 2.63V VTRIP threshold, and delivers 100,000 write cycles endurance for critical system configuration storage in industrial microcontroller applications.

For engineers reviewing the X5045PIZ datasheet, X5045PIZ pinout, X5045PIZ application, or X5045PIZ equivalent, this page details its verified reset timing (200ms tPURST), watchdog timeout options (200ms/600ms/1.4s), block-lock EEPROM protection modes, SPI interface compliance (3.3MHz max), and low-power standby current (<10µA with WDT off).

Technical Context

The X5045PIZ implements a dual-function CS/WDI pin to monitor microcontroller activity and trigger reset on watchdog timeout, with nonvolatile WD0/WD1 bits selecting one of three timeout intervals or disabling the timer. Its internal voltage detector uses a precision comparator with 2.63V ±2.5% trip point, asserting RESET until VCC exceeds VTRIP for 200ms and remains ≥1V.

EEPROM operation follows standard SPI protocol with MSB-first 8-bit instructions (READ/WRITE/WREN/RDSR/WRSR), 16-byte page writes, and Direct Write™ cell technology enabling 1M write cycles and 100-year data retention. Block lock protection is controlled by BL0/BL1 bits, allowing selective write-protection of 0%, 25%, 50%, or 100% of the 512×8 array.

Key Specifications

Pinout & Package

Package: 8-lead PDIP (Plastic Dual In-line Package), RoHS-compliant Pb-free plus anneal finish, -40°C to +85°C operating temperature range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX690TCSA+ and MCP9701-E/P, the X5045PIZ uniquely combines voltage supervision, watchdog, and 4K-bit EEPROM in one 8-pin PDIP device - eliminating component count and interconnect complexity where integrated functionality and 2.7V operation are required.

Availability

X5045PIZ is available at Aetrix Electronics and suitable for industrial process controllers, network infrastructure equipment, medical diagnostic devices, and battery-powered data loggers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X5045PIZ 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 Corporation, now part of Renesas Electronics, designs high-performance analog and power management ICs for industrial, communications, and computing markets.

The X5045PIZ belongs to Intersil's CPU Supervisor family, engineered to consolidate reset, watchdog, voltage monitoring, and nonvolatile storage into a single chip - targeting cost-sensitive, space-constrained embedded systems needing guaranteed boot integrity and configuration persistence.

FAQ

What is the factory-default VTRIP voltage for X5045PIZ?

The X5045PIZ ships with a factory-programmed VTRIP threshold of 2.63V ±2.5%, optimized for 2.7V nominal supply rails. This value is stored in nonvolatile circuitry and remains unchanged across power cycles unless explicitly reprogrammed using the VP=15–18V sequence on the WP pin. The X5045PIZ datasheet specifies this as the "-2.7" suffix variant's standard trip point.

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

No, the X5045PIZ provides only an active-low open-drain RESET output. The "X5045" designation indicates active-low reset; the "X5043" variant offers active-high. The X5045PIZ pinout and electrical specifications confirm RESET/RESET is asserted low during power-up, brownout, or watchdog timeout, requiring an external pull-up resistor for proper logic level translation.

How many watchdog timeout options does X5045PIZ offer, and how are they selected?

The X5045PIZ offers three selectable watchdog timeout periods - 200ms, 600ms, and 1.4 seconds - plus a disabled state. These are configured via two nonvolatile WD0/WD1 bits in the status register, programmed using the WRSR instruction. The factory default is WD1=1, WD0=1 (watchdog disabled), and settings persist through power loss, eliminating need for reinitialization at boot.

What is the maximum SPI clock frequency supported by X5045PIZ?

The X5045PIZ supports a maximum SPI clock frequency of 3.3MHz across its full 2.7V–5.5V VCC range, as specified in the AC Electrical Specifications table. This allows high-speed configuration reads and writes without constraining host microcontroller SPI peripheral timing, and applies to all operations including READ, WRITE, RDSR, and WRSR commands.

Can X5045PIZ EEPROM be partially protected against writes?

Yes, the X5045PIZ implements Block Lock™ protection controlled by BL0/BL1 bits, enabling four protection levels: none (0%), lower quarter ($180–$1FF), lower half ($100–$1FF), or full array ($000–$1FF). This nonvolatile setting is written via WRSR instruction and works in conjunction with the WP pin and Write Enable Latch to provide layered write security for critical configuration data stored in the 512×8 EEPROM.