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The PAL16R4D/2PC is a Programmable Array Logic (PAL) device manufactured by AMD (Advanced Micro Devices).

Specifications:

• Device Type: PAL (Programmable Array Logic)
• Part Number: PAL16R4D/2PC
• Manufacturer: AMD
• Technology: Bipolar (TTL)
• Package: 20-pin DIP (Dual In-line Package)
• Operating Voltage: 5V (TTL-compatible)
• Speed Grade: 2 (indicating propagation delay)
• Number of Inputs: 16
• Number of Outputs: 4 (registered outputs)
• Macrocells: 8 (4 registered, 4 combinational)
• Programmable: One-time programmable (OTP)
• Operating Temperature: Commercial (0°C to 75°C)

Descriptions:

The PAL16R4D/2PC is a high-performance, field-programmable logic device designed for implementing complex combinational and sequential logic functions. It features a fixed OR array and a programmable AND array, allowing users to define custom logic operations.

Features:

• Registered Outputs: 4 outputs with flip-flops for sequential logic applications.
• Combinational Outputs: 4 additional combinational outputs.
• High-Speed Operation: Optimized for performance with TTL compatibility.
• One-Time Programmable (OTP): Fuse-based programming for permanent logic configuration.
• Wide Input Range: Supports up to 16 inputs for flexible logic design.
• DIP Packaging: Easy to use in breadboard and PCB applications.

This device was commonly used in digital circuit designs for state machines, address decoding, and control logic before the widespread adoption of CPLDs and FPGAs.