SN74HC251PW

The SN74HC251PW is a high-speed CMOS multiplexer/demultiplexer integrated circuit (IC) produced by Texas Instruments. It is part of the 74HC family, which stands for High-speed CMOS, and is designed for use in a variety of digital applications. Below is a detailed description of its features, specifications, and typical applications.

General Description:

The SN74HC251PW is an 8-channel multiplexer that allows for the selection of one of eight data inputs (D0 to D7) based on a 3-bit binary select input (S0, S1, S2). The selected input is routed to a single output (Y), making it useful for data routing and signal selection in digital circuits. The device can also function as a demultiplexer, directing a single input to one of several outputs.

Key Features:

• High-Speed Operation: The device operates at high speeds, with a maximum propagation delay of around 6 ns at a supply voltage of 5V, making it suitable for high-frequency applications.
• Wide Supply Voltage Range: It can operate with a supply voltage ranging from 2V to 6V, providing flexibility for various applications.
• Low Power Consumption: The SN74HC251PW features low static and dynamic power consumption, making it energy-efficient.
• TTL Compatibility: The outputs are compatible with TTL logic levels, allowing for easy integration with other TTL devices.
• Three-State Outputs: The outputs can be placed in a high-impedance state, allowing for multiple devices to share the same output line without interference.
• Pin Configuration: The device is available in a 16-pin TSSOP (Thin Shrink Small Outline Package) package, which is compact and suitable for space-constrained applications.

Pin Configuration:

• Inputs: D0 to D7 (data inputs), S0, S1, S2 (select inputs), and an enable input (G).
• Output: Y (the output that reflects the selected data input).
• Control Pins: The enable pin (G) allows the device to be activated or deactivated, controlling whether the selected input is routed to the output.

Electrical Characteristics:

• Operating Temperature Range: Typically from -40°C to +125°C, making it suitable for industrial applications.
• Input and Output Voltage Levels: The input high voltage (VIH) and low voltage (VIL) levels are defined to ensure proper logic level recognition.
• Output Drive Capability: The device can drive standard loads, making it suitable for interfacing with other digital components.

Typical Applications:

• Data Routing: Used in applications where multiple data sources need to be routed to a single destination.
• Signal Switching: Ideal for switching between different signal paths in communication systems.
• Multiplexing/Demultiplexing: Commonly used in digital systems for multiplexing data streams or demultiplexing a single data stream to multiple outputs.
• Memory Addressing: Can be used in memory systems to select specific memory locations based on address inputs.

Conclusion:

The SN74HC251PW from Texas Instruments is a versatile and efficient multiplexer/demultiplexer that is well-suited for a wide range of digital applications. Its high-speed performance, low power consumption, and compatibility with TTL logic make it a popular choice among engineers and designers in the field of electronics.