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The 74F646AN is a high-speed octal bus transceiver and register manufactured by Signetics. It is part of the 74F family of Fast TTL logic devices.

Key Specifications:

• Logic Type: Octal Bus Transceiver/Register
• Technology: Fast TTL (74F)
• Number of Bits: 8 (Octal)
• Supply Voltage (VCC): 4.5V to 5.5V
• Operating Temperature Range: 0°C to +70°C (Commercial)
• Package Type: 24-pin DIP (Dual In-line Package)
• I/O Type: 3-State Outputs
• Direction Control: Bidirectional with separate control pins
• Propagation Delay: Typically 5.5ns (max)
• Output Drive Capability: 64mA (sink), 15mA (source)

Descriptions:

The 74F646AN combines an 8-bit transceiver with D-type flip-flops, allowing data to be stored or passed through in either direction. It features separate control inputs for data flow direction and output enable, making it suitable for bidirectional bus interfacing in microprocessor systems.

Features:

• Bidirectional data flow with transparent or latched operation
• Independent control for A-to-B and B-to-A data paths
• 3-State outputs for bus-oriented applications
• High-speed operation with typical propagation delays of 5.5ns
• Low power consumption compared to standard TTL
• Wide operating voltage range (4.5V to 5.5V)
• 24-pin DIP package for easy PCB mounting

This device is commonly used in data communication systems, microprocessor buses, and memory interfacing where bidirectional data transfer with storage capability is required.

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