TIBPAL20R8-10CFN

Overview

The TIBPAL20R8-10CFN is a high-performance PAL-type programmable logic device from Texas Instruments. It features 12 inputs and 8 registered outputs with 3-state buffers. The device operates at a maximum clock frequency of 71.4 MHz without feedback, with a typical propagation delay of 8 ns and a maximum of 10 ns. It utilizes Advanced Low-Power Schottky technology and titanium-tungsten fuses for reliable performance.

Feature Summary

• Combines Advanced Low-Power Schottky technology with titanium-tungsten fuses for high-speed operation.
• Includes preload capability on output registers to simplify testing sequences.
• Provides power-up clear functionality where all register outputs initialize to a low level.
• Features a security fuse mechanism to prevent unauthorized duplication of the design.

Applications

• High-speed state machine implementations requiring external feedback paths.
• Counter designs utilizing internal feedback configurations.
• System initialization circuits leveraging automatic power-up reset states.
• Custom logic replacement in compact board space applications using chip carriers.

Procurement Notes

Verify that the specific ordering suffix corresponds to the Plastic Chip Carrier package type, as the datasheet lists multiple package options including DIP variants. Confirm RoHS compliance status separately, as older TI PLD families often carry non-compliant markings. Ensure programming equipment supports the titanium-tungsten fuse architecture specified for this IMPACT-X series.

Selection Notes

Select this component when eight registered outputs with 3-state control are required within a 24-pin footprint. The TIBPAL20R8 variant is distinct from the TIBPAL20L8 (combinatorial) and other R-series models by its specific count of registered I/O ports. Consider the 10 ns speed grade if system timing margins require propagation delays under 10 ns at 5 V supply.

Part Context

This device belongs to the TIBPAL20xx-10C family of IMPACT-X PAL circuits. It serves as a functional equivalent to existing 24-pin PLD circuits but offers improved speed characteristics. The family includes variants like TIBPAL20R4 and TIBPAL20R6, differentiated primarily by the number of registered outputs available for design implementation.

Replacement Considerations

Publicly confirmed substitutes include other members of the TIBPAL20R series such as the TIBPAL20R4 or TIBPAL20R6, provided the design requires fewer than eight registered outputs. These devices share identical pinouts and electrical characteristics, allowing for direct pin-compatible upgrades or downgrades based on logic density requirements.