TIBPAL20R8-25CFN

Overview

The TIBPAL20R8-25CFN is a low-power, high-performance IMPACT PAL programmable logic device manufactured by Texas Instruments. It features 12 inputs and 8 registered outputs with 3-state buffers. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports an operating temperature range of 0°C to 75°C. Key electrical parameters include a maximum propagation delay (tpd) of 25 ns from input to output and 15 ns from clock to register output. Maximum operating frequencies are 33 MHz without feedback and 25 MHz with feedback. The typical supply current (ICC) is 75 mA, with a maximum of 105 mA.

Feature Summary

• Direct replacement for PAL20R8A with at least 50% reduction in power consumption.
• Preload capability on output registers simplifies testing procedures.
• Power-up clear feature sets all register outputs to a low level upon initialization.
• Utilizes Advanced Low-Power Schottky technology with titanium-tungsten fuses.

Applications

• State machine implementation requiring synchronous reset capabilities.
• High-speed digital logic substitution in TTL-compatible systems.
• Custom function design where board space reduction via chip carriers is beneficial.

Procurement Notes

Verify the specific ordering suffix 'FN' against official documentation to confirm package type and material composition. Confirm availability status as legacy components may have limited distribution channels or require alternative sourcing strategies through authorized distributors specializing in obsolete parts.

Selection Notes

Select this component when a registered output configuration with 3-state control is required for the TIBPAL20 architecture. Ensure the design accommodates the 12-input/8-output pinout and utilizes the preload feature for efficient test sequence initialization. Verify that the 25 ns speed grade meets the system timing requirements for both combinational and registered paths.

Part Context

This part belongs to the TIBPAL20L8/R4/R6/R8-25C series, which are low-power variants of the IMPACT PAL family. These devices were designed to offer functional equivalency to standard PAL20R8A devices while significantly reducing power dissipation. The series integrates proven reliability features such as Ti-W fuses and comprehensive AC/DC factory testing.

Replacement Considerations

Functionally equivalent to AMD AMPAL20R8A. When replacing, ensure the new device supports the same 3-state registered output configuration and matches the 25 ns propagation delay specifications. Verify pin compatibility if substituting with non-TI equivalents.