TIBPAL20R4-15CNT

Overview

The TIBPAL20R4-15CNT is a high-performance IMPACT PAL circuit from Texas Instruments, featuring 12 inputs and 4 registered outputs with 3-state buffers. It operates on a 5 V supply with a maximum clock frequency of 45 MHz and propagation delays of 12 ns (input to output) and 8 ns (clock to Q). The device supports an operating temperature range of 0 °C to 75 °C and includes power-up clear functionality for all register outputs.

Feature Summary

• High-speed performance utilizing Advanced Low-Power Schottky technology
• Registered outputs with asynchronous preload capability for simplified testing
• Power-up clear feature resets all registers to zero upon initialization
• Functionally equivalent to older PAL20R4 devices but with improved speed

Applications

• Complex state machine implementations requiring synchronous logic
• High-speed data path buffering and registration
• System control logic in industrial or commercial environments
• Replacement for legacy TTL-based programmable logic designs

Procurement Notes

Verify the specific suffix 'CNT' against official Texas Instruments documentation to confirm package type and material compliance, as standard datasheets list JT/NT/W/FN/FK suffixes. Confirm that the 'C' series designation aligns with the required 0 °C to 75 °C operating temperature range for your application environment. Ensure programming equipment supports titanium-tungsten fuse technology.

Selection Notes

Select this device when registered outputs with 3-state control are required alongside high-speed processing. The 12-input, 4-output configuration suits applications needing moderate I/O density with synchronous behavior. Compare against TIBPAL20R4-20M if military-grade temperature ranges (-55 °C to 125 °C) are necessary instead of commercial grades.

Part Context

This component belongs to the TIBPAL20 family of IMPACT PAL circuits, designed as faster substitutes for conventional PAL20L8, PAL20R4, PAL20R6, and PAL20R8 devices. The family combines proven reliability with reduced ICC consumption. The TIBPAL20R4 variant specifically provides four registered outputs, distinguishing it from combinational variants like the TIBPAL20L8.

Replacement Considerations

The TIBPAL20R4-15C is functionally equivalent to the AMD AMPAL20R4. When replacing older PAL20R4 devices, ensure the new design accounts for the higher speed and different power characteristics. Verify pinout compatibility, particularly regarding the OE and CLK pins, which remain consistent across the TIBPAL20 family.