TIBPAL20R8-15CNT

Overview

The TIBPAL20R8-15CNT is a high-performance IMPACT PAL circuit manufactured by Texas Instruments. It features 12 inputs and 8 registered outputs with 3-state buffers, utilizing Advanced Low-Power Schottky technology. The device operates at a maximum clock frequency of 45 MHz without feedback and supports a nominal supply voltage of 5 V. Registered outputs include power-up clear and preload capabilities for simplified testing. The 'C' suffix indicates characterization from 0 °C to 75 °C, while the 'NT' package denotes a plastic DIP configuration.

Feature Summary

• High-speed performance with fmax up to 45 MHz (without feedback)
• Registered outputs with asynchronous preload capability
• Power-up clear feature sets all registers low upon initialization
• Functionally equivalent to PAL20R8 but with improved speed

Applications

• State machine implementations requiring fast clocking
• Complex glue logic replacement in TTL systems
• Digital control circuits needing registered output buffering

Procurement Notes

Verify that the component matches the specific 'NT' plastic DIP package variant. Confirm the 'C' temperature grade aligns with industrial operating ranges of 0 °C to 75 °C. Ensure programming equipment supports the IMPACT PAL fuse structure and preload procedures defined in the datasheet.

Selection Notes

Select this model when eight registered outputs are required alongside twelve inputs. The registered architecture simplifies timing analysis compared to combinatorial PALs. Consider the TIBPAL20L8 if registered outputs are unnecessary, or the TIBPAL20R4/R6 for fewer output requirements.

Part Context

This device belongs to the TIBPAL20 family of high-performance PAL circuits. It serves as an upgraded substitute for standard PAL20R8 devices, offering faster propagation delays and lower current consumption. The family includes variants with different output configurations and military temperature grades.

Replacement Considerations

Direct functional equivalents include the PAL20R8, though the TIBPAL20R8 offers superior speed. For broader compatibility within the same package, verify pinout consistency with legacy PAL20R8 designs.