Renesas X5045P

Overview

X5045P from Intersil 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 features 2.55–2.7V V_CC operating range, 2.63V reset threshold (±2.5%), and active-low RESET output with 200ms timeout. Used in industrial microcontroller systems requiring reliable brownout protection and nonvolatile configuration storage.

For engineers reviewing the X5045P datasheet, X5045P pinout, X5045P application, or X5045P equivalent, key selection criteria include its programmable V_TRIP, 1.4s/600ms/200ms selectable watchdog timeout, block-lock EEPROM protection, SPI interface at 3.3MHz, and <10µA standby current with watchdog disabled.

Technical Context

The X5045P implements a dual-function reset architecture: power-on reset (t_PURST = 200ms nominal) and low-voltage detection with factory-set 2.63V trip point (±2.5%), reprogrammable via high-voltage VP sequence. Its watchdog timer uses CS/WDI input toggling and nonvolatile WD0/WD1 bits to select timeout intervals - 200ms, 600ms, or 1.4s - with default disabled state.

EEPROM operation follows standard SPI protocol (mode 0, CPOL=0, CPHA=0) with 8-bit instruction set, 16-byte page write capability, and Direct Write™ cell technology enabling 1M write cycles and 100-year data retention. Block lock protection (BL0/BL1 bits) allows 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), Pb-free, 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 integrated EEPROM applications.

Compared with MAX690TSA+ and MCP9700-E/P, the X5045P uniquely integrates four functions - reset, watchdog, voltage monitor, and EEPROM - within a single 2.55–2.7V supply rail, enabling compact, low-power embedded designs where memory persistence and brownout resilience are co-dependent requirements.

Availability

X5045P is available at Aetrix Electronics and suitable for industrial process controllers, network infrastructure equipment, battery-powered instrumentation, and desktop motherboard support requiring stable component supply and long-term lifecycle assurance.

Supply support for X5045P 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 (now part of Renesas Electronics) is a semiconductor manufacturer specializing in precision analog, power management, and interface ICs for industrial, communications, and computing markets.

The X5045P belongs to Intersil's CPU Supervisor family, designed to consolidate power monitoring, reset generation, watchdog supervision, and nonvolatile storage into one device for space- and reliability-constrained embedded systems.

FAQ

What is the exact V_TRIP voltage for X5045P and can it be modified?

The X5045P ships with a factory-set V_TRIP of 2.63V ±2.5%. This threshold is reprogrammable to a custom value using a 15–18V programming voltage (VP) applied to the WP pin and a specific SPI command sequence - either SET VTRIP (write 00h to address 01h) or RESET VTRIP (write 00h to address 03h). The procedure is detailed in FN8126 pages 6–7 and requires precise V_CC biasing during programming.

Does X5045P support both active-high and active-low reset outputs?

No - the X5045P provides only an active-low RESET output (open-drain). The datasheet distinguishes X5043 (active-low) and X5045 (active-high) variants; X5045P is the active-high version. However, the ordering information table on page 4 explicitly lists "X5045PZ-2.7" under the RESET (ACTIVE HIGH) column, confirming that X5045P delivers active-high RESET. Therefore, X5045P has active-high RESET output, not active-low.

What is the maximum SPI clock frequency supported by X5045P?

The X5045P supports a maximum SPI clock frequency of 3.3MHz across its full 2.55–2.7V V_CC range, as specified in the AC Electrical Specifications table (page 14). This allows direct interfacing with most microcontrollers' SPI peripherals without clock prescaling, and guarantees timing compliance for read, write, and status register operations.

How does the watchdog timer on X5045P get reset, and what are the timeout options?

The X5045P watchdog timer is reset by a falling edge on the CS/WDI pin. Its timeout interval is selected via nonvolatile WD0/WD1 bits in the status register: 200ms (WD1=1, WD0=0), 600ms (WD1=0, WD0=1), or 1.4s (WD1=0, WD0=0); WD1=WD0=1 disables the watchdog. These bits retain their setting across power cycles and are programmed using the WRSR instruction.

Can the EEPROM in X5045P be partially write-protected, and how is this configured?

Yes - the X5045P EEPROM supports partial write protection via two nonvolatile block lock bits (BL0, BL1) in the status register. These bits configure protection for 0% (BL1=BL0=0), 25% (BL1=0, BL0=1), 50% (BL1=1, BL0=0), or 100% (BL1=BL0=1) of the 512×8 array. Protection is enforced independently of the WP pin and WREN latch, providing layered security against accidental writes.