Renesas X5045S8IZ-2.7

Overview

X5045S8IZ-2.7 from Intersil (now Renesas) is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 4Kbit SPI EEPROM in a single 8-pin SOIC package. It features a 2.85–3.0V reset threshold, -40°C to +85°C industrial temperature range, and active-low RESET output. It serves as a system-level reliability enhancer in microcontroller-based embedded systems requiring brownout protection and nonvolatile configuration storage.

For engineers reviewing the X5045S8IZ-2.7 datasheet, X5045S8IZ-2.7 pinout, X5045S8IZ-2.7 application, or X5045S8IZ-2.7 equivalent, key selection criteria include its programmable VTRIP threshold, 200ms reset timeout, 3.3MHz SPI interface, 100,000 write-cycle EEPROM endurance, and dual protection via WP pin and block lock bits - all critical for robust power management and data integrity in field-deployed equipment.

Technical Context

The X5045S8IZ-2.7 implements a dedicated low-voltage detection circuit with factory-trimmed 2.85V ±2.5% trip point, asserting RESET until VCC exceeds VTRIP for 200ms. Its watchdog timer uses CS/WDI as input and supports four timeout intervals (200ms/600ms/1.4s/disabled) controlled by nonvolatile WD0/WD1 bits in the status register.

Internally, it combines a 512 × 8-bit SPI EEPROM with Intersil's Direct Write™ cell technology (1M write cycles, 100-year retention), block lock protection (configurable 0%, 25%, 50%, or 100% array lock), and dual write safeguards: software-enabled WREN latch and hardware WP pin. All functions operate across 2.7–5.5V supply range.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), RoHS-compliant Pb-free plus anneal finish, body size 4.9mm × 3.9mm × 1.75mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6816EPA+ and STM8AF6266T, the X5045S8IZ-2.7 delivers single-chip integration of reset, watchdog, and EEPROM with field-adjustable VTRIP - reducing BOM count, layout complexity, and qualification effort for industrial embedded systems where reliability and configurability are prioritized over MCU programmability.

Availability

X5045S8IZ-2.7 is available at Aetrix Electronics and suitable for industrial process controllers, network infrastructure equipment, smart meters, and battery-powered telemetry nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for X5045S8IZ-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 Corporation (formerly Intersil) is a global semiconductor leader specializing in microcontrollers, analog, power management, and timing solutions for industrial, automotive, and communications markets.

The X5045 family was designed as an integrated CPU supervisor platform targeting cost-sensitive, space-constrained embedded systems needing guaranteed power-on sequencing, fail-safe watchdog coverage, and secure nonvolatile parameter storage - all in one monolithic device.

FAQ

What is the factory-set VTRIP voltage for X5045S8IZ-2.7?

The X5045S8IZ-2.7 ships with a factory-trimmed VTRIP of 2.85V ±2.5%, corresponding to the "-2.7A" suffix in the ordering code. This threshold is guaranteed over temperature and supply voltage, and may be reprogrammed higher using the VP=15–18V sequence on the WP pin - but cannot be lowered without first executing the VTRIP reset procedure.

Does X5045S8IZ-2.7 support active-high reset output?

No - the X5045S8IZ-2.7 provides only an active-low open-drain RESET output. The "X5045" designation indicates active-low reset; active-high variants (e.g., X5043 series) use different part numbering and are not functionally interchangeable with X5045S8IZ-2.7 due to differing reset polarity and internal logic mapping.

How does the watchdog timer interact with the CS/WDI pin on X5045S8IZ-2.7?

On the X5045S8IZ-2.7, the CS/WDI pin serves dual roles: 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) longer than the selected timeout interval (200ms/600ms/1.4s), the device asserts RESET. This design eliminates need for a dedicated WDI signal line.

Can X5045S8IZ-2.7's EEPROM be written while the watchdog is enabled?

Yes - the X5045S8IZ-2.7 allows EEPROM writes during watchdog operation. However, the CS/WDI pin must still be toggled within the watchdog timeout period to prevent RESET assertion. During a write cycle, the WIP bit in the status register indicates busy state, and CS must remain LOW until completion; this does not interfere with watchdog timing as long as CS transitions occur before timeout expiration.

What is the minimum VCC required for X5045S8IZ-2.7 to maintain valid RESET assertion?

The X5045S8IZ-2.7 guarantees RESET remains asserted down to VCC = 1V, per the VRVALID specification. Below 1V, the internal circuitry may become indeterminate. This ensures fail-safe behavior during deep brownout or battery exhaustion - critical for preserving system state integrity before complete power loss.