GAL16V8QS-25QVI

Programmable Logic Device Pld Overview

The GAL16V8QS-25QVI is a Complex Programmable Logic Device (CPLD) manufactured by National Semiconductor. It features a high-speed performance with a maximum propagation delay of 25 nanoseconds, supporting clock frequencies up to 40 MHz. The device operates within a standard voltage range of 4.5 V to 5.5 V and is designed for industrial temperature environments ranging from -40°C to +85°C. Packaged in a 28-pin Plastic Quad Flat Package (PQFP), it provides 16 input lines and 8 output lines, making it suitable for general-purpose logic applications requiring moderate I/O density and reliable operation in demanding conditions.

Programmable Logic Device Pld Feature Summary

• High-speed logic switching with 25 ns maximum propagation delay
• Industrial temperature rating spanning -40°C to +85°C
• Standard 5V operation with wide supply tolerance (4.5V–5.5V)
• 28-pin PQFP package for surface-mount integration

Programmable Logic Device Pld Applications

• General digital logic replacement for legacy TTL/CMOS circuits
• Address decoding and chip select generation in embedded systems
• State machine implementation for control logic
• Bus interface buffering and protocol conversion

Programmable Logic Device Pld Procurement Notes

Verify component authenticity due to the age of the National Semiconductor product line. Confirm RoHS compliance status as original manufacturing may predate modern environmental directives. Check for lead-free plating variations if replacing older inventory. Ensure storage conditions prevent moisture damage given the plastic package type. Validate pin compatibility with existing PCB footprints before procurement.

Programmable Logic Device Pld Selection Notes

Select this component when a 16-input, 8-output logic solution is required with guaranteed 25 ns timing. Compare against GAL16V8 variants if lower speed or different packaging is acceptable. Consider power consumption differences between QS (standard) and D (low power) suffixes. Verify voltage levels match system requirements strictly within the 4.5V to 5.5V range. Assess thermal dissipation capabilities within the PQFP package for the specific enclosure design.

Programmable Logic Device Pld Part Context

This part belongs to the GAL16V8 family of programmable logic devices originally developed by Lattice Semiconductor and later produced under license by various manufacturers including National Semiconductor. These devices were widely used in the 1990s and early 2000s for replacing fixed-function logic gates. The 'QS' suffix typically denotes a commercial/industrial grade variant in a quad flat package, distinguishing it from PLCC or DIP alternatives.

Programmable Logic Device Pld Replacement Considerations

Direct replacements include GAL16V8QS-25QVI equivalents from other foundries if available. Cross-reference with GAL16V8-25PC or GAL16V8-25QC for pin-compatible options in different packages. Modern FPGA or CPLD upgrades may require logic restructuring but offer better availability. Verify electrical characteristics match exactly to ensure signal integrity in critical paths.