TIBPAL20R4-25CNT

Overview

The TIBPAL20R4-25CNT is a low-power, high-performance Simple Programmable Logic Device (SPLD) from the IMPACT PAL family by Texas Instruments. It features a PAL-type architecture with 12 inputs and 8 I/O lines, providing four registered outputs with three-state buffers. The device operates at a nominal 5 V supply voltage and supports a maximum clock frequency of 33 MHz without feedback. Key electrical parameters include a maximum propagation delay of 25 ns for input-to-output paths and 15 ns for clock-to-register transitions. It utilizes titanium-tungsten fuses for programming and includes power-up clear functionality for all registers.

Feature Summary

• Low-Power High-Performance: Reduced ICC of 105 mA max with 25 ns max propagation delay.
• Registered Outputs: Four registered outputs with three-state buffers and preload capability.
• Direct Replacement: Functionally equivalent to PAL20R4A with over 50% power reduction.
• Power-Up Clear: All register outputs initialize to a low level upon power-up.

Applications

• State machine implementation requiring registered output control.
• High-speed logic replacement in TTL-compatible systems.
• Custom function design where board space reduction is prioritized via chip carrier options.

Procurement Notes

Verify component authenticity through authorized distributors or Texas Instruments directly. Confirm package type matches requirements, as the 'CNT' suffix indicates a plastic DIP package. Check RoHS compliance status, as older production runs may not meet current environmental standards. Ensure programming equipment supports titanium-tungsten fuse technology for reliable configuration.

Selection Notes

Select this model when four registered outputs with tri-state capability are required within a 24-pin DIP footprint. Compare against TIBPAL20L8-25C if combinatorial outputs are needed instead of registered ones. Verify that the 25 ns speed grade meets system timing constraints. Consider the TIBPAL20R6-25C or TIBPAL20R8-25C if additional registered outputs are necessary for the application.

Part Context

This component belongs to the TIBPAL20 series of IMPACT PAL circuits, designed to replace conventional PAL20R4A devices. The series combines Advanced Low-Power Schottky technology with proven fuse structures. It is characterized for operation between 0°C and 75°C. The device is part of a broader family including L8, R6, and R8 variants differing primarily in output registration and count.

Replacement Considerations

Functionally equivalent to PAL20R4A. For pin-compatible alternatives with similar performance, consider the TIBPAL20R4-25CN or TIBPAL20R4-25CNT3. Verify that substitute devices support the same 25 ns speed grade and registered output configuration.