GAL20V8QS-25QVI

Programmable Logic Device Pld Overview

The GAL20V8QS-25QVI is an Electrically Erasable Programmable Logic Device (EE PLD) manufactured by Texas Instruments, originally part of the National Semiconductor product line. It features a PAL-type architecture with 20 input lines and 8 output lines, organized into 8 macrocells. The device operates with a maximum propagation delay of 25 ns and supports a maximum clock frequency of 37 MHz. It utilizes a 28-pin Plastic Quad Flat Package (PQCC) or Leadless Ceramic Chip Carrier (LCC) housing. Key functional attributes include shared input/clock capabilities and register preload functionality.

Programmable Logic Device Pld Feature Summary

• PAL-type EE PLD architecture with 64 product terms
• 25 ns propagation delay and 37 MHz maximum clock frequency
• 20 inputs and 8 outputs with 8 dedicated macrocells
• Supports register preload and shared input/clock configurations

Programmable Logic Device Pld Part Context

This component belongs to the GAL20V8 family of programmable logic devices. The 'QS' suffix typically denotes a specific package variant, while '25' indicates the speed grade. As an EE PLD, it offers reprogrammability compared to one-time programmable PALs, allowing for design iterations without hardware replacement. The device represents a transition technology between fixed logic gates and complex FPGAs.

Programmable Logic Device Pld Replacement Considerations

Direct replacements may include other GAL20V8 variants from Texas Instruments or Microchip Technology, such as the GAL20V8B series. Compatibility depends on verifying pinout alignment, voltage levels, and programming tool support. Cross-referencing datasheets for electrical characteristics and timing parameters is essential before substitution.