The 54F257DMQB is a Quad 2-Input Multiplexer with 3-State Outputs manufactured by Fairchild/ON Semiconductor. It belongs to the 54F family of high-speed TTL logic devices and is designed for military and aerospace applications requiring robust performance and reliability. The 'DMQB' suffix indicates a specific package and screening level associated with military-grade components.

Applications

• Military and aerospace data selection
• Memory address multiplexing
• Data routing in communication systems
• Function generation
• Control logic selection

Features

• Quad 2-input multiplexer configuration
• High-speed operation
• 3-State outputs for bused applications
• Low input loading
• Select input for data selection
• Enable input for output control
• Military temperature range

Benefits

• Efficient data selection from multiple sources
• Fast switching speeds for high-performance systems
• Simplified bus interfacing
• Reduced loading on input signals
• Flexible output control
• Reliable operation in harsh environments

Additional Details

The 54F257DMQB selects one of two data inputs for each of the four multiplexer channels based on the logic level applied to the select input. The selected data is then routed to the corresponding output. The 3-state outputs allow multiple multiplexers to share a common bus. The device operates from a 5V power supply, and its electrical characteristics, including propagation delays, input and output voltage levels, and power consumption, are detailed in the Fairchild/ON Semiconductor datasheet. The military-grade designation ensures that the device has undergone rigorous testing and screening to meet stringent reliability requirements. The device is used where efficient data routing and selection is critical. The specific packaging ('DMQB') impacts mounting and assembly considerations; consultation of the datasheet is essential for these details.