PAL20RS4CNL

Programmable Logic Device Pld Overview

The PAL20RS4CNL is a registered output Programmable Array Logic (PAL) device manufactured by Advanced Micro Devices. It utilizes an EE PLD architecture with TTL logic levels and operates at a maximum clock frequency of 16 MHz. The component features 10 inputs, 4 registered outputs, and 64 product terms within its AND-OR array. Packaged in a 20-pin Plastic Quad Flatpack (PQCC), it supports register preload and power-up reset functions. Designed for high-speed digital logic applications, it provides fixed OR gates with individual three-state control for registered outputs.

Programmable Logic Device Pld Feature Summary

• Registered Output Architecture: Features 4 registered outputs with feedback capability for sequential logic implementation.
• High-Speed Performance: Operates with a maximum clock frequency of 16 MHz and propagation delay characteristics suitable for rapid switching.
• TTL Compatibility: Designed for direct interfacing with standard TTL logic families using a 5V supply voltage.
• Flexible I/O Configuration: Provides 10 dedicated inputs and 4 registered outputs within a 20-pin package.

Programmable Logic Device Pld Applications

• Sequential logic circuit design
• State machine implementation
• Digital counter circuits
• Register file construction

Programmable Logic Device Pld Procurement Notes

Verify the specific speed grade suffix against the manufacturer's datasheet to ensure timing requirements are met. Confirm RoHS compliance status as older AMD PLD variants may not meet current environmental directives. Check pinout compatibility if replacing legacy components in existing PCB layouts.

Programmable Logic Device Pld Selection Notes

Select this component when registered outputs are required for synchronous designs. Compare the 16 MHz speed grade against system clock requirements. Ensure the 20-pin PQCC package fits the available footprint. Consider the 64 product term limit for complex combinatorial logic before choosing larger GALs or CPLDs.

Programmable Logic Device Pld Part Context

This part belongs to the AMD PAL series of programmable logic devices. It shares architectural similarities with other PAL20Rxx variants but is distinguished by its registered output configuration. These devices were widely used in the 1980s and 1990s for microcontroller support logic and interface buffering before being superseded by more dense programmable logic technologies.

Programmable Logic Device Pld Replacement Considerations

Direct pin-compatible replacements include the PAL20RA4 and PAL20RG8 from the same family. For modern equivalents, consider Lattice GAL16V8 or Atmel ATF series devices with registered outputs, ensuring voltage level and speed specifications match the original design constraints.