Renesas X5045PIZ-2.7A

Overview

X5045PIZ-2.7A from Intersil (now Renesas) is a CPU supervisor IC integrating power-on reset, watchdog timer, supply voltage supervision, and 4Kbit SPI EEPROM in a single 8-lead PDIP package. It features a 2.85–3.0V reset threshold, -40°C to +85°C operating range, and active-low RESET output. It is used in industrial embedded systems requiring reliable brownout protection and nonvolatile configuration storage.

For engineers reviewing the X5045PIZ-2.7A datasheet, X5045PIZ-2.7A pinout, X5045PIZ-2.7A application, or X5045PIZ-2.7A equivalent, key selection criteria include its programmable VTRIP, 200ms reset timeout, 3.3MHz SPI interface, 100,000 write-cycle EEPROM endurance, and dual-level block lock memory protection.

Technical Context

The X5045PIZ-2.7A implements a dedicated low-voltage detection circuit with factory-trimmed 2.85–3.0V trip point, validated for operation across -40°C to +85°C. Its watchdog timer uses nonvolatile WD0/WD1 bits to select fixed timeout intervals (200ms, 600ms, or 1.4s), independent of power cycling.

Reset assertion is synchronized to VCC stabilization via internal POR logic, holding RESET active until VCC exceeds VTRIP for 200ms (typical). The SPI EEPROM operates at up to 3.3MHz with 16-byte page writes and supports block lock protection covering 0%, 25%, 50%, or 100% of the 512×8-bit array.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP9800T-E/MS and MAX6361KA29+T, the X5045PIZ-2.7A uniquely integrates four functions-reset, watchdog, voltage monitor, and EEPROM-in one industrial-grade PDIP package, eliminating external components and reducing board area while maintaining full configurability of VTRIP and memory protection.

Availability

X5045PIZ-2.7A is available at Aetrix Electronics and suitable for industrial process controllers, network infrastructure routers, medical diagnostic equipment, and battery-powered data loggers requiring stable component supply and long-term lifecycle support.

Supply support for X5045PIZ-2.7A 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 communications markets.

The X5045PIZ-2.7A belongs to Renesas' legacy CPU supervisor family designed to consolidate power management, system monitoring, and nonvolatile storage into a single IC for space-constrained embedded systems.

FAQ

What is the exact reset threshold voltage of the X5045PIZ-2.7A?

The X5045PIZ-2.7A has a factory-programmed VTRIP threshold of 2.85–3.0V, specified at ±2.5% tolerance. This value is guaranteed over the full -40°C to +85°C operating temperature range and remains stable across power cycles unless reprogrammed using the high-voltage VTRIP adjustment procedure defined in the FN8126 datasheet.

Does the X5045PIZ-2.7A support both active-low and active-high reset outputs?

No - the X5045PIZ-2.7A provides only an active-low open-drain RESET output. The part number suffix "-2.7A" explicitly denotes the active-low variant (RESET); the active-high version would be designated X5043PIZ-2.7A (RESET). Both share identical electrical and functional specifications except for reset polarity.

Can the watchdog timer timeout period be changed dynamically in the X5045PIZ-2.7A?

Yes - the watchdog timeout is controlled by two nonvolatile bits (WD0 and WD1) in the status register, which can be rewritten via the WRSR instruction. Valid settings are 200ms, 600ms, 1.4s, or disabled. Once written, these bits retain their state through power cycles, enabling field-updatable watchdog behavior without hardware changes.

What is the maximum SPI clock frequency supported by the X5045PIZ-2.7A?

The X5045PIZ-2.7A supports a maximum SPI clock frequency of 3.3MHz under all valid VCC conditions (2.7–5.5V). This timing is verified across temperature and voltage extremes per AC Electrical Specifications in FN8126 Rev 3.00, enabling interoperability with high-speed microcontrollers without clock throttling.

How does the block lock protection work in the X5045PIZ-2.7A EEPROM?

The X5045PIZ-2.7A uses two nonvolatile BL0/BL1 bits to configure hardware write protection for 0%, 25%, 50%, or 100% of its 512×8-bit EEPROM array. When enabled, protected blocks remain readable but reject all write attempts - even if the Write Enable Latch is set and WP is high - ensuring immutable storage of critical firmware or calibration data.