SN74HC253D

The SN74HC253D is a dual 4-channel multiplexer/demultiplexer integrated circuit (IC) manufactured by Texas Instruments. It is part of the 74HC family, which stands for High-Speed CMOS, and is designed for high-speed digital applications. Below is a detailed description of its features, specifications, and applications:

General Description:

The SN74HC253D is designed to route digital signals from multiple sources to a single output or to route a single input to multiple outputs. It contains two independent 4-channel multiplexers, allowing for versatile signal routing in digital circuits. The device operates with a wide supply voltage range, making it suitable for various applications.

Key Features:

• Dual 4-Channel Multiplexer/Demultiplexer: The device includes two separate multiplexers, each capable of selecting one of four inputs based on the state of two select lines.
• High-Speed Operation: The SN74HC253D can operate at high speeds, with propagation delays typically around 6 ns at a supply voltage of 5V.
• Wide Supply Voltage Range: It operates with a supply voltage range from 2V to 6V, making it compatible with various logic levels.
• Low Power Consumption: The device features low static and dynamic power consumption, which is beneficial for battery-operated devices.
• TTL Compatible: The outputs are compatible with TTL logic levels, allowing for easy interfacing with other digital components.
• Active Low Enable Inputs: The device includes enable inputs that allow for easy control of the multiplexing function.

Pin Configuration:

The SN74HC253D is typically available in a 16-pin Dual In-Line Package (DIP) or a surface-mount package. The pin configuration includes:

• Input Pins (A0, A1): These are the select lines used to choose which input channel to route to the output.
• Data Input Pins (D0-D3): Four data input pins for each multiplexer, where the digital signals are fed.
• Output Pins (Y): The output pin where the selected input signal is routed.
• Enable Pins (E): Active low enable pins that control the operation of the multiplexers.

Electrical Characteristics:

• Supply Voltage (Vcc): 2V to 6V
• Input Voltage (Vi): 0V to Vcc
• Output Voltage (Vo): 0V to Vcc
• Maximum Input Current: ±20 mA
• Operating Temperature Range: Typically from -40°C to +125°C

Applications:

The SN74HC253D is widely used in various applications, including:

• Data Routing: In communication systems for routing data from multiple sources to a single destination.
• Signal Switching: In audio and video applications for switching between different signal sources.
• Multiplexing in Digital Circuits: For selecting data from multiple sources in microcontroller and FPGA applications.
• Control Systems: In industrial automation for controlling multiple devices with a single control signal.

Conclusion:

The SN74HC253D from Texas Instruments is a versatile and efficient dual 4-channel multiplexer/demultiplexer that is ideal for high-speed digital applications. Its combination of low power consumption, wide supply voltage range, and compatibility with TTL logic makes it a popular choice for engineers and designers in various electronic projects.