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The PAL16R8ACN is a Programmable Array Logic (PAL) device manufactured by Monolithic Memories, Inc. (MMI) and later by Texas Instruments (TI) after acquisition.

Key Specifications:

• Device Type: PAL (Programmable Array Logic)
• Technology: Bipolar (TTL)
• Package: 20-pin DIP (Dual In-line Package)
• Operating Voltage: 5V (±10%)
• Speed Grade: 25 ns (typical propagation delay)
• Inputs: 8 dedicated inputs
• Outputs: 8 registered outputs (with feedback)
• Macrocells: 8 (fixed architecture)
• Programmability: One-time programmable (OTP) using PROM technology

Description:

The PAL16R8ACN is a registered PAL device with a fixed AND-OR architecture, featuring 8 registered outputs with feedback. It is designed for combinatorial and sequential logic applications, commonly used in digital systems for state machines, address decoding, and control logic.

Features:

• Registered Outputs: 8 D-type flip-flops with common clock and output enable.
• Combinatorial Logic: Fixed AND array with programmable OR terms.
• Feedback Paths: Outputs can feed back into the AND array for state machine applications.
• High-Speed Operation: 25 ns propagation delay (typical).
• Wide Operating Temperature Range: Commercial (0°C to 75°C) or Industrial (-40°C to 85°C).
• One-Time Programmable (OTP): Fuse-based programming.

This device is now considered obsolete but was widely used in legacy digital designs.