GAL20V8QS-25QNC - National Semiconductor EE PLD | 25NS PAL-TYPE CPLD
The GAL20V8QS-25QNC is a cutting-edge EE PLD (Electrically Erasable Programmable Logic Device) manufactured by National Semiconductor, now part of Texas Instruments. This PAL-TYPE CPLD (Complex Programmable Logic Device) is engineered for high-speed digital logic applications with its impressive 25-nanosecond propagation delay. As part of the renowned GAL (Generic Array Logic) family, this device offers superior flexibility and performance for prototyping and production environments alike. The GAL20V8QS-25QNC stands out for its electrically erasable CMOS technology, allowing for reprogrammability and design iterations without requiring physical replacement.
Designed for reliability and efficiency, this PLD features 20 inputs and 8 outputs (as indicated by its 20V8 designation), making it suitable for a wide range of logic implementation tasks. The device operates with standard 5V power supply and incorporates advanced architecture that supports both combinatorial and registered logic functions. Its high-speed performance makes it particularly valuable in applications where timing precision is critical, such as in communication interfaces, industrial control systems, and digital signal processing.
The GAL20V8QS-25QNC offers significant advantages over conventional PAL devices, including reprogrammability, higher speed grades, and lower power consumption. Its architecture includes programmable AND arrays and fixed OR arrays, providing designers with the flexibility to implement complex logic functions while maintaining predictable timing characteristics. The device's 25ns maximum propagation delay ensures reliable operation in demanding applications, while its CMOS technology delivers low power consumption compared to bipolar alternatives.
Key technical specifications include 100% tested for functionality and performance, industrial temperature range operation, and compatibility with standard PLD development tools. The device is housed in a PLCC (Plastic Leaded Chip Carrier) package, offering reliable surface-mount connectivity for automated assembly processes. Designers will appreciate the device's 10,000 erase/write cycle endurance and data retention of 20 years, ensuring long-term reliability in deployed systems.
For engineers seeking a robust, high-performance programmable logic solution, the GAL20V8QS-25QNC represents an excellent choice. Its combination of speed, flexibility, and reliability makes it suitable for applications ranging from protocol conversion and address decoding to state machine implementation and bus interfacing. National Semiconductor's quality assurance and the device's active production status ensure availability and support for current and future design projects requiring medium-complexity programmable logic solutions.
