Renesas X5045S8I-4.5AT1

Overview

X5045S8I-4.5AT1 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-lead SOIC package. It provides active-high RESET output, 4.63V ±2.5% VTRIP threshold, -40°C to +85°C operation, and supports microcontroller systems requiring reliable brownout detection and nonvolatile configuration storage.

For engineers reviewing the X5045S8I-4.5AT1 datasheet, X5045S8I-4.5AT1 pinout, X5045S8I-4.5AT1 application, or X5045S8I-4.5AT1 equivalent, this device serves as a single-chip solution for embedded system power integrity, fault recovery, and parameter retention-particularly where board space, BOM count, and supply voltage margin are critical constraints.

Technical Context

The X5045S8I-4.5AT1 implements a dedicated low-voltage detection circuit with factory-trimmed 4.63V reset threshold, programmable via high-voltage sequence to custom values. Its watchdog timer uses CS/WDI input monitoring with four selectable timeout periods (200ms, 600ms, 1.4s, or disabled), controlled by nonvolatile WD0/WD1 bits in the status register.

EEPROM functionality features 512 × 8-bit organization, SPI interface compliant with standard 4-wire protocol, 16-byte page write mode, and Direct Write™ cell technology enabling 1M write cycles and 100-year data retention. Block lock protection (BL0/BL1) allows selective write-protection of 0%, 25%, 50%, or 100% of memory array.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (Small Outline Integrated Circuit), RoHS-compliant, Pb-free plus anneal finish.

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 STM802SWX6F, the X5045S8I-4.5AT1 uniquely combines field-adjustable reset threshold, 4K-bit EEPROM, and industrial temperature support in one SOIC-8 package-enabling higher integration density and eliminating external memory dependencies in mission-critical embedded systems.

Availability

X5045S8I-4.5AT1 is available at Aetrix Electronics and suitable for industrial process controllers, network infrastructure equipment, and battery-powered data loggers requiring stable component supply and long-term lifecycle assurance.

Supply support for X5045S8I-4.5AT1 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 company specializing in power management, precision analog, and mixed-signal ICs for industrial, communications, and computing markets.

The X5045 family was designed to consolidate power supervision, watchdog safety, and nonvolatile storage into a single chip-targeting embedded systems where reliability, board space, and supply chain simplicity are primary design constraints.

FAQ

What is the VTRIP voltage for X5045S8I-4.5AT1, and can it be modified?

The X5045S8I-4.5AT1 ships with a factory-set VTRIP of 4.63V ±2.5%. This threshold is reprogrammable using a high-voltage sequence (15–18V applied to WP pin while VCC equals desired trip voltage), allowing field calibration for tighter tolerance or custom voltage points. The procedure is documented in the FN8126 datasheet Section "VCC Threshold Reset Procedure" and requires no special programming hardware-only controlled voltage application and SPI command issuance.

Does X5045S8I-4.5AT1 support active-low or active-high RESET output?

X5045S8I-4.5AT1 provides an active-high RESET output, as indicated by the "-4.5A" suffix in its part number (per Ordering Information on page 3 of FN8126). This distinguishes it from the X5043 series, which delivers active-low RESET. The active-high signal drives directly into most modern microcontrollers without requiring external inverters or level-shifting circuitry.

How many write cycles does the EEPROM in X5045S8I-4.5AT1 support?

The EEPROM in X5045S8I-4.5AT1 supports a minimum of 1,000,000 write cycles, enabled by Intersil's proprietary Direct Write™ cell technology. This endurance rating is specified under typical operating conditions and ensures robust performance in applications requiring frequent parameter updates, such as adaptive calibration or event logging-far exceeding the 100,000-cycle rating of conventional EEPROM architectures.

What is the maximum SPI clock frequency supported by X5045S8I-4.5AT1?

X5045S8I-4.5AT1 supports a maximum SPI clock frequency of 3.3 MHz, as confirmed in the AC Electrical Specifications table (page 14 of FN8126). This rate applies across the full 4.5–5.5V VCC range and enables efficient configuration reads and writes while maintaining timing margins compatible with widely deployed 8-bit and 32-bit microcontrollers.

Is X5045S8I-4.5AT1 RoHS-compliant and lead-free?

Yes, X5045S8I-4.5AT1 is RoHS-compliant and manufactured with Intersil's Pb-Free Plus Anneal process. It features 100% matte tin plating and Pb-free molding compounds, meeting IPC/JEDEC J-STD-020 reflow requirements for both SnPb and Pb-free soldering processes. The "T1" suffix explicitly denotes tape-and-reel packaging compatible with automated SMT assembly lines.