Renesas X5045P-2.7

Overview

X5045P-2.7 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, 200ms reset timeout, and supports 3.3MHz SPI communication - enabling reliable system initialization and data retention in low-voltage embedded applications such as industrial controllers and network edge devices.

For engineers reviewing the X5045P-2.7 datasheet, X5045P-2.7 pinout, X5045P-2.7 application, or X5045P-2.7 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in FN8126 Rev 3.00 and official Renesas product documentation.

Technical Context

The X5045P-2.7 implements a dual-function reset architecture: power-on reset (tPURST = 200ms typ.) and brownout detection with factory-set 2.85–3.0V VTRIP, reprogrammable via VP=15–18V sequence. Its watchdog timer uses nonvolatile WD0/WD1 bits to select fixed timeouts (200ms/600ms/1.4s or disabled), triggered by CS/WDI transitions.

The integrated 512 × 8-bit SPI EEPROM employs Direct Write™ technology (1M write cycles, 100-year retention) with block lock protection (BL0/BL1 bits) and hardware write protection via WP pin. All operations comply with standard SPI timing at up to 3.3MHz, with SO push-pull output and SI/SCK/CS/WDI CMOS-compatible inputs.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361KA29+T and MCP9808-E/P, the X5045P-2.7 uniquely integrates reprogrammable brownout detection, 3.3MHz SPI EEPROM, and watchdog in one PDIP package - eliminating BOM count, layout area, and inter-IC timing risks in space-constrained industrial designs.

Availability

X5045P-2.7 is available at Aetrix Electronics and suitable for industrial process controllers, network router bootloader storage, battery-powered telemetry nodes, and medical infusion pump safety monitors requiring stable component supply and long-term lifecycle support.

Supply support for X5045P-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

Intersil (acquired by Renesas Electronics in 2017) is a semiconductor innovator specializing in power management, precision analog, and embedded control solutions for industrial, communications, and computing markets.

The X5045P-2.7 belongs to Intersil's CPU Supervisor family, designed to consolidate reset, watchdog, voltage monitoring, and nonvolatile storage into a single chip - reducing system complexity and improving reliability in mission-critical embedded applications.

FAQ

What is the factory-set VTRIP voltage for X5045P-2.7?

The X5045P-2.7 ships with a factory-programmed VTRIP range of 2.85–3.0V, as specified in the Ordering Information table on page 4 of FN8126 Rev 3.00. This threshold is laser-trimmed and stable over temperature and time. The value can be reprogrammed higher using VP=15–18V and the SET VTRIP sequence, or reset to native ~1.7V using the RESET VTRIP procedure - both documented in Figures 1 and 2 of the datasheet.

Does X5045P-2.7 support active-high reset output?

No - the X5045P-2.7 is the active-low reset variant (RESET). The active-high version is designated X5043P-2.7. Both share identical pinout, EEPROM, watchdog, and VTRIP functionality, differing only in reset polarity. The datasheet confirms RESET/RESET labeling on Pin 8 reflects this distinction: X5045 outputs active-low, X5043 outputs active-high.

How does the watchdog timer interact with the CS/WDI pin on X5045P-2.7?

On the X5045P-2.7, the CS/WDI pin serves dual purpose: chip select for SPI and watchdog input. A falling edge on CS/WDI resets the watchdog timer. If CS/WDI remains static (HIGH or LOW) beyond the selected timeout (200ms/600ms/1.4s), the device asserts RESET. This behavior is controlled by nonvolatile WD0/WD1 bits and persists across power cycles - ensuring continuous supervision even after brownout recovery.

Can X5045P-2.7's EEPROM be written to while the watchdog is enabled?

Yes - EEPROM writes are fully supported with the watchdog enabled on X5045P-2.7. The watchdog monitors only CS/WDI activity, not memory operations. However, successful writes require both the Write Enable Latch (set via WREN command) and WP pin held HIGH. During a write cycle, the WIP bit in the Status Register indicates busy state, allowing the host MCU to poll completion without affecting watchdog timing.

What package options are available for X5045P-2.7 besides the 8-lead PDIP?

The X5045P-2.7 is specifically offered in 8-lead PDIP (plastic dual in-line package), as confirmed in the Ordering Information table on page 4 of FN8126 Rev 3.00. Other variants like X5045S8Z-2.7A use SOIC, and X5045M8IZ-2.7A use MSOP - but those are distinct part numbers with different suffixes and markings. The "P" in X5045P-2.7 explicitly denotes PDIP packaging per Intersil's naming convention.