TIBPAL20R4-15CFN

Overview

The TIBPAL20R4-15CFN is a high-performance Impact PAL circuit from Texas Instruments, characterized for operation between 0°C and 75°C. It features 12 inputs and 8 I/O lines, with four registered outputs and four 3-state outputs. The device utilizes Advanced Low-Power Schottky technology and titanium-tungsten fuses. Key electrical parameters include a maximum clock frequency of 45 MHz, a typical propagation delay of 12 ns from input to output, and 8 ns from clock to registered output. Supply voltage ranges from 4.75 V to 5.25 V, with a maximum ICC of 180 mA.

Feature Summary

• High-speed performance with a minimum 45 MHz clock frequency (without feedback).
• Registered outputs feature power-up clear and preload capability for simplified testing.
• Functionally equivalent to PAL20R4 but with reduced ICC of 180 mA max.
• Combines Advanced Low-Power Schottky technology with titanium-tungsten fuses.

Applications

• State-machine initialization and control logic.
• Register design with asynchronous preload capabilities.
• Replacement for conventional TTL logic in compact circuit boards.

Procurement Notes

Verify the 'FN' suffix indicates a plastic flat package variant by cross-referencing the specific datasheet revision SRPS021. Confirm RoHS compliance status as older TI PAL devices may not meet current environmental standards. Ensure programming equipment supports titanium-tungsten fuse architectures.

Selection Notes

Select this model over the -20M series if operating within the commercial temperature range of 0°C to 75°C rather than the military range. The -15C series offers a higher maximum clock frequency of 45 MHz compared to the 41.6 MHz of the -20M series. Verify that the FN package footprint matches the PCB layout requirements.

Part Context

This component belongs to the TIBPAL20 family of Impact PAL circuits, which includes variants like TIBPAL20L8, TIBPAL20R6, and TIBPAL20R8. These devices serve as high-performance substitutes for standard PAL20L8, PAL20R4, PAL20R6, and PAL20R8 logic devices, offering improved speed and lower power consumption through Advanced Low-Power Schottky technology.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pinout compatibility with legacy PAL20R4 devices when replacing existing circuits.