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The TIBPAL20R4-15CFN is a Programmable Array Logic (PAL) device manufactured by Texas Instruments (TI). Below are the factual specifications, descriptions, and features from the Manufactor Datasheet:

Manufacturer: Texas Instruments (TI)

Part Number: TIBPAL20R4-15CFN

Key Specifications:

• Device Type: Programmable Array Logic (PAL)
• Number of Inputs: 20
• Number of Outputs: 4 (Registered)
• Speed Grade: 15 ns (Maximum Propagation Delay)
• Package Type: 20-Pin Plastic Leaded Chip Carrier (PLCC)
• Operating Voltage: 5V (Standard TTL Levels)
• Operating Temperature Range: Commercial (0°C to +70°C)

Description:

The TIBPAL20R4-15CFN is a high-performance PAL device featuring a programmable AND array and a fixed OR array. It includes registered outputs with feedback for sequential logic applications. It is designed for high-speed digital logic implementations.

Features:

• 20 Inputs (including dedicated clock and output enable pins)
• 4 Registered Outputs (with feedback to the AND array)
• 15 ns Maximum Propagation Delay (for high-speed operation)
• Programmable AND Array (for custom logic functions)
• Fixed OR Array (for output term summation)
• 5V Operation (compatible with standard TTL logic levels)
• PLCC Package (20-pin, surface-mount)
• Electrically Erasable (EE) Technology (reprogrammable for design flexibility)

This information is based solely on the manufacturer's datasheet and technical documentation.