GAL20V8QS-10LVI

Programmable Logic Device Pld Overview

The GAL20V8QS-10LVI is a CMOS Electrically Erasable Programmable Logic Device (EEPLD) manufactured by National Semiconductor. It features a PAL-type architecture with 20 input lines, 8 dedicated inputs, and 8 output lines housed in a 28-pin LDCC plastic package. The device supports a maximum operating frequency of 58.8 MHz with a typical propagation delay of 10 ns. It operates within a voltage range of 4.5 V to 5.5 V and includes eight macrocells with shared input/clock capabilities and register preload functionality.

Programmable Logic Device Pld Feature Summary

• CMOS EEPLD technology with electrically erasable non-volatile memory
• 20 Inputs, 8 Outputs, and 8 Macrocells for flexible logic implementation
• 10 ns maximum propagation delay supporting up to 58.8 MHz operation
• Shared input/clock structure with register preload capability

Programmable Logic Device Pld Applications

• Digital logic replacement for discrete gate circuits
• Address decoding and chip select generation
• State machine implementation in industrial control systems
• Bus interface logic conversion

Programmable Logic Device Pld Procurement Notes

Verify the manufacturer origin as National Semiconductor or Texas Instruments, noting that TI acquired NS's logic business. Confirm the specific suffix 'QS' indicates qualified temperature or reliability grades if required by the application. Ensure the 28-pin LDCC package matches the PCB footprint. Check for RoHS compliance status depending on the production batch date.

Programmable Logic Device Pld Selection Notes

Select this component when a fast, reprogrammable logic solution is needed to replace fixed-function PALs. The 10 ns speed class suits applications requiring moderate timing performance. The QS variant may offer extended temperature ranges or higher reliability compared to standard commercial versions. Verify pin compatibility with existing GAL20V8 designs before substitution.

Programmable Logic Device Pld Part Context

This part belongs to the GAL20V8 family of simple programmable logic devices. It serves as a drop-in replacement for older PAL devices like the PAL16R8 or GAL16V8 in many legacy designs. The GAL20V8 series provides a balance of I/O count and speed, making it suitable for general-purpose digital logic applications where field reprogramming is beneficial.

Programmable Logic Device Pld Replacement Considerations

Direct replacements include the Lattice GAL20V8C-10LJNI and the Texas Instruments GAL20V8QS-25QVC. Note that the -25QVC variant has a slower 25 ns delay. Ensure the substitute maintains the same 28-pin LDCC package and electrical characteristics.