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The MM5649AN is a digital integrated circuit manufactured by National Semiconductor (NS). Below are the factual details about the part:

Manufacturer:

National Semiconductor (NS)

Specifications:

• Function: 4-Bit Full Adder with Fast Carry
• Logic Family: TTL (Transistor-Transistor Logic)
• Supply Voltage (Vcc): 5V (standard TTL levels)
• Operating Temperature Range: 0°C to +70°C (commercial grade)
• Package Type: 16-pin DIP (Dual In-line Package)

Descriptions:

• The MM5649AN is a 4-bit binary full adder with fast carry generation.
• It performs arithmetic addition of two 4-bit binary numbers along with a carry input (Cin).
• The output includes a 4-bit sum (S0–S3) and a carry-out (Cout).
• Designed for high-speed arithmetic operations in digital systems.

Features:

• 4-Bit Parallel Addition: Processes two 4-bit inputs (A0–A3, B0–B3).
• Fast Carry Look-Ahead: Reduces propagation delay for high-speed operation.
• TTL-Compatible Inputs/Outputs: Works with standard TTL logic levels.
• Cascadable: Multiple MM5649AN ICs can be cascaded for wider bit operations.
• Low Power Consumption: Optimized for efficient power usage.

This information is based on the manufacturer's datasheet and technical documentation. For further details, refer to the official NS datasheet.