TIBPAL16L8-25CN

Overview

The TIBPAL16L8-25CN is a low-power high-performance IMPACT PAL programmable logic device featuring 10 dedicated inputs, 6 I/O ports, and 2 registered outputs. It utilizes titanium-tungsten fuses for reliable configuration. The C suffix indicates a maximum propagation delay of 25 ns from input to output and 20 ns from clock to registered output. The device operates with a nominal supply voltage of 5 V and supports a maximum clock frequency of 30 MHz.

Feature Summary

• Combines Advanced Low-Power Schottky technology with titanium-tungsten fuses for high performance and reliability.
• Provides power-up clear functionality where all register outputs initialize to a high state upon power application.
• Offers functional equivalency to older PAL16L8A devices while delivering faster switching speeds.

Applications

• Replacement for conventional TTL logic in digital circuit designs.
• Implementation of custom combinational and registered logic functions.
• State-machine initialization and control within embedded systems.
• Bus interface circuits requiring simple programmable logic elements.

Procurement Notes

Verify the specific package marking and date code against the manufacturer's latest lifecycle status documentation. Confirm that the lead finish matches RoHS requirements if applicable to the target assembly process. Ensure programming equipment compatibility with titanium-tungsten fuse structures before procurement.

Selection Notes

Select this component when a direct replacement for legacy PAL16L8A circuits is required with improved speed characteristics. Choose the C suffix for commercial temperature ranges (0°C to 75°C) and the N suffix for plastic DIP packaging. Verify that the 25 ns timing meets the system clock requirements.

Part Context

This device belongs to the Texas Instruments IMPACT-X PAL family, designed as high-speed substitutes for standard PAL logic. It shares architectural similarities with other members like the TIBPAL16R4 and TIBPAL16R6 but differs in its specific output configuration of dedicated inputs, I/Os, and registered outputs.

Replacement Considerations

The datasheet explicitly states functional equivalency with faster performance compared to the PAL16L8A. Designers should verify pinout compatibility and ensure that the higher drive capabilities do not exceed load specifications of the receiving circuitry.

FAQ

How does the power-up reset feature affect registered outputs?

Upon power-up, all register outputs are set high. This simplifies state-machine initialization, though designers must ensure a monotonic VCC rise and wait for setup times before applying clock transitions.

What technology is used for the programmable interconnects?

The device uses titanium-tungsten fuses combined with Advanced Low-Power Schottky technology to provide reliable, high-performance logic functions.