Renesas X5045PZ

Overview

X5045PZ from Intersil is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 4Kbit SPI EEPROM in an 8-lead PDIP package. It provides active-low RESET output, 2.55–2.7V VCC operating range, 2.63V reset threshold (±2.5%), and supports 3.3MHz SPI communication for microcontroller system monitoring and nonvolatile data storage.

For engineers reviewing the X5045PZ datasheet, X5045PZ pinout, X5045PZ application, or X5045PZ equivalent, this device serves as a single-chip solution for brownout protection, watchdog timeout recovery, and configuration/data retention in space-constrained embedded systems requiring stable 2.7V operation and block-lock EEPROM security.

Technical Context

The X5045PZ implements a dual-function CS/WDI pin that enables both SPI command execution and watchdog timer reset via falling-edge detection. Its internal voltage monitor uses a precision comparator with factory-trimmed 2.63V trip point, reprogrammable to custom thresholds using VP=15–18V on WP and controlled VCC biasing.

Watchdog timeout is set by nonvolatile WD0/WD1 bits in the status register, supporting four fixed intervals (200ms, 600ms, 1.4s, or disabled). The 512×8 EEPROM array uses Direct Write™ technology, enabling 1M write cycles and 100-year data retention, with block lock protection configurable for 0%, 25%, 50%, or 100% of memory via BL0/BL1 bits.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361LKA26+T and MCP9800-I/P, the X5045PZ uniquely combines reprogrammable voltage supervision, multi-interval watchdog, and 4Kbit block-locked EEPROM in a single 2.7V-optimized PDIP package - making it irreplaceable for designs requiring field-tunable brownout response and robust configuration storage.

Availability

X5045PZ is available at Aetrix Electronics and suitable for industrial process controllers, network infrastructure equipment, and battery-powered IoT sensors requiring stable component supply with guaranteed long-term availability.

Supply support for X5045PZ 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) is a semiconductor manufacturer specializing in power management, precision analog, and interface ICs for industrial, computing, and communications markets.

The X5045PZ belongs to Intersil's CPU Supervisor family, designed to consolidate reset, watchdog, voltage monitoring, and EEPROM into one die - targeting cost-sensitive, space-constrained embedded systems needing high reliability and field-programmable supervision thresholds.

FAQ

What is the exact VTRIP voltage for X5045PZ and can it be modified?

The X5045PZ has a factory-set VTRIP of 2.63V ±2.5%, corresponding to its "-2.7" suffix. Yes, this threshold is reprogrammable using a high-voltage sequence: apply desired VTRIP to VCC, tie WP to 15–18V, issue WREN, then write 00h to address 01h. The X5045PZ retains the new value nonvolatily across power cycles.

Does X5045PZ support both active-low and active-high RESET outputs?

No. The X5045PZ provides only an active-low open-drain RESET output (pin 8). The datasheet distinguishes X5043 (active-low) and X5045 (active-high) variants - X5045PZ is the active-high version, but per Ordering Information on page 4, X5045PZ-2.7 uses active-high RESET. However, the pin description on page 5 states "RESET/RESET is an active low/HIGH, open drain output", and the ordering table confirms X5045PZ-2.7 has RESET (active high). Therefore, X5045PZ delivers active-high RESET output - verified by part marking "X5045P Z F" and functional block diagram labeling RESET (X5045).

What is the maximum SPI clock frequency supported by X5045PZ?

The X5045PZ supports a maximum SPI clock frequency of 3.3MHz under recommended operating conditions (VCC = 2.55–2.7V). This is specified in the AC Electrical Specifications table on page 14, where fSCK (Clock Frequency) is listed as 0–3.3MHz for the 2.7V–5.5V range - fully applicable to the X5045PZ's 2.55–2.7V VCC window.

How does the watchdog timer on X5045PZ get reset, and what are the timeout options?

The X5045PZ watchdog timer is reset by a falling edge on the CS/WDI pin (pin 1). Timeout is selected via nonvolatile WD0/WD1 bits in the status register: 200ms (WD1=1, WD0=0), 600ms (WD1=0, WD0=1), 1.4s (WD1=0, WD0=0), or disabled (WD1=1, WD0=1 - factory default). These settings persist through power loss, and the X5045PZ asserts active-high RESET if timeout occurs.

What EEPROM protection mechanisms does X5045PZ provide beyond software write enable?

The X5045PZ provides three hardware-enforced EEPROM protections: (1) Write Protect (WP) pin - pulls low to disable all nonvolatile writes; (2) Block Lock™ bits (BL0/BL1) - nonvolatile configuration locking 0%, 25%, 50%, or 100% of memory; (3) Write Enable Latch (WEL) - volatile bit requiring WREN instruction before any write. All three operate independently, and the X5045PZ requires simultaneous satisfaction of WEL=1, WP=high, and unlocked block address to permit a write.