TIBPAL20R4-25CFN

Overview

The TIBPAL20R4-25CFN is a low-power, high-performance Simple Programmable Logic Device (SPLD) from the IMPACT PAL family by Texas Instruments. It features a registered output architecture with 12 inputs and 4 registered outputs, plus 8 I/O lines. The device operates at a maximum propagation delay of 25 ns and supports clock frequencies up to 33 MHz without feedback. Designed for 5 V supply, it utilizes Advanced Low-Power Schottky technology to reduce power consumption while maintaining TTL compatibility.

Feature Summary

• Registered Output Architecture: Includes 4 registered outputs with preload capability for simplified testing and state initialization.
• High Performance: Achieves a maximum propagation delay of 25 ns and a minimum frequency of 33 MHz without feedback.
• Low Power Consumption: Features a maximum ICC of 105 mA, offering at least a 50% reduction in power compared to standard PAL20R4A devices.
• Power-Up Reset: All register outputs are automatically set to a low level upon power-up to ensure valid system initialization.

Applications

• Direct replacement for legacy PAL20R4A circuits in existing designs.
• State machine implementation requiring registered outputs and reliable power-up states.
• Custom logic functions in compact circuit boards where reduced board space and lower power are critical.

Procurement Notes

Verify that the specific ordering suffix 'CFN' corresponds to the plastic DIP package variant as documented in the official datasheet. Confirm RoHS compliance status, as older IMPACT PAL series devices may not meet current environmental directives. Ensure programming equipment supports the titanium-tungsten fuse technology used in this component.

Selection Notes

Select the TIBPAL20R4-25CFN when a registered output configuration is required rather than combinatorial logic. This model provides 4 registered outputs and 8 I/O lines, distinguishing it from the TIBPAL20L8 (combinatorial) or TIBPAL20R6/R8 variants. Ensure the design accommodates the 25 ns max propagation delay and 5 V operating voltage requirements.

Part Context

This component belongs to the TIBPAL20’C series, characterized for operation between 0°C and 75°C. It is part of the broader IMPACT PAL family, which also includes TIBPAL20L8, TIBPAL20R6, and TIBPAL20R8 models sharing similar electrical characteristics but differing in output registration and pin configurations.

Replacement Considerations

The TIBPAL20R4-25CFN serves as a direct functional replacement for the PAL20R4A device, providing equivalent functionality with significantly reduced power consumption. Designers should verify pinout compatibility, particularly regarding the OE and CLK pins on the FN package.