X51638 CPU Supervisor with 16Kbit SPI EEPROM Datasheet

Category: Electronics, Intersil Corporation, Other Semiconductors

Overview

The X51638 datasheet details a CPU supervisor integrated circuit that combines Power-on Reset Control, Watchdog Timer, Supply Voltage Supervision, and Block Lock Protect Serial EEPROM functions. The IC is designed to enhance system reliability, reduce board space, and lower system costs by integrating these critical functions.

Features

The device offers various features including an extended power-on reset, a selectable watchdog timer, and a low Vcc detection with reset assertion. It supports five standard reset threshold voltages with the ability to reprogram the low Vcc reset threshold for custom applications. An SPI interface is provided for ease of integration, with a standby current of less than 50uA with the watchdog on, and a 400uA max active current during read operations. The EEPROM comes with built-in write protection and can be protected completely or in portions to safeguard critical data. The IC is operable across various voltage ranges and is available in different package options, such as 14-lead TSSOP and 8-lead SOIC.

Functionality

The power-on reset feature of the X51638 ensures that the RESET signal is maintained active to allow the power supply and oscillator to stabilize before any code execution by the processor. The watchdog timer acts as an independent safeguard, resetting the device when a preselected timeout interval passes without being restarted. The integrated low Vcc detection monitors supply voltage levels and asserts reset when it drops below a set threshold. This feature ensures the system is protected against undervoltage conditions.

Product Applications

This device is crucial for applications requiring dependable system initialization and protection against faulty operation due to voltage irregularities or software errors. The EEPROM with Block Lock protection adds to system security, making the X51638 an excellent choice for sensitive data applications.

Block Diagram and Pin Configuration

Included in the datasheet is a block diagram showing the internal structure of the watchdog timer, reset logic, protect logic, SPI interface, and EEPROM memory organization. The pin configuration section provides a detailed layout and description of the IC’s leads, including their functions and interconnects.

Important Notes

The device is sensitive to electrostatic discharge, and proper IC handling procedures must be followed. Intersil’s (the manufacturer) contact information and copyright disclaimer are also included at the end of the described features.