Renesas X5045PI-2.7

Overview

X5045PI-2.7 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 an 8-pin SOIC package. It provides 2.85V–3.0V reset threshold, 200ms reset timeout, and supports 3.3MHz SPI communication for microcontroller systems requiring reliable boot-up and data retention.

For engineers reviewing the X5045PI-2.7 datasheet, X5045PI-2.7 pinout, X5045PI-2.7 application, or X5045PI-2.7 equivalent, this page delivers verified functional identity, validated pin roles, confirmed VTRIP and watchdog timing, real-world use cases in industrial instrumentation and battery-powered equipment, and two technically documented alternative parts with explicit differences.

Technical Context

The X5045PI-2.7 implements a dual-function supervisory architecture: its POR circuit asserts RESET/RESET for ≥200ms after VCC exceeds 2.85V, while its independent watchdog monitors CS/WDI transitions to detect MCU lockup. The reset output remains active until VCC stabilizes above the 2.85V trip point for 200ms and stays valid down to VCC = 1V.

Its integrated 512 × 8-bit SPI EEPROM uses Direct Write™ technology with 1M write cycles and 100-year data retention. Block Lock™ protection-controlled via nonvolatile BL0/BL1 bits in the status register-enables selective write-protection of 0%, 25%, 50%, or 100% of memory, enforced simultaneously with WP pin assertion and WREN latch state.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), RoHS-compliant, -40°C to +85°C industrial temperature range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX690TSA+ and MCP9808-E/P, the X5045PI-2.7 uniquely combines field-adjustable reset voltage, multi-interval watchdog, and high-endurance SPI EEPROM in one SOIC-8 device - making it irreplaceable for battery-backed or brownout-prone embedded systems requiring both reliability and configurability.

Availability

X5045PI-2.7 is available at Aetrix Electronics and suitable for industrial process control, battery-powered telemetry, and network equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for X5045PI-2.7 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 X5045PI-2.7 belongs to Renesas' legacy CPU supervisor family designed specifically for embedded systems needing integrated reset, watchdog, and nonvolatile memory - reducing board space and improving system-level reliability.

FAQ

What is the factory-set VTRIP voltage for X5045PI-2.7?

The X5045PI-2.7 ships with a factory-programmed VTRIP range of 2.85V to 3.0V, corresponding to the "-2.7A" suffix per the FN8126 datasheet ordering table. This threshold is reprogrammable using a 15–18V pulse on the WP pin and a specific SPI command sequence - enabling field calibration without hardware revision. The X5045PI-2.7 maintains this setting across power cycles due to nonvolatile storage of the trip point.

Does X5045PI-2.7 support both active-high and active-low reset outputs?

No - the X5045PI-2.7 is the active-high reset variant (X5045 series). Its RESET/RESET pin is open-drain and asserted high during power-up, brownout, or watchdog timeout. This differs from the X5043 series (e.g., X5043PI-2.7), which provides active-low reset. The X5045PI-2.7 datasheet explicitly labels the output as "RESET (X5045)" in block diagrams and pin descriptions.

How many watchdog timeout intervals does X5045PI-2.7 support, and how are they selected?

The X5045PI-2.7 supports four watchdog timeout intervals: disabled, 200ms, 600ms, and 1.4s. Selection is performed by writing to the nonvolatile WD0 and WD1 bits in the status register using the WRSR instruction. These bits retain their state across power cycles, ensuring consistent watchdog behavior without MCU reinitialization. The default factory setting is disabled (WD1=1, WD0=1).

What is the maximum SPI clock frequency supported by X5045PI-2.7?

The X5045PI-2.7 supports a maximum SPI clock frequency of 3.3MHz across its full 2.7V–5.5V operating range, as specified in the AC Electrical Specifications table (page 14 of FN8126 Rev 3.00). This allows high-speed EEPROM reads and writes while maintaining timing margins for robust communication with diverse microcontrollers - including those with limited SPI peripheral flexibility.

Can X5045PI-2.7's EEPROM be partially write-protected, and how is it implemented?

Yes - X5045PI-2.7 implements Block Lock™ protection allowing selective write-protection of 0%, 25%, 50%, or 100% of its 512×8-bit EEPROM array. Protection is controlled by nonvolatile BL0/BL1 bits in the status register (written via WRSR) and enforced simultaneously with the WP pin state and WREN latch. This layered approach prevents accidental writes even if software or pin control fails independently.