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The HD74HC251P is a high-speed CMOS 8-channel digital multiplexer manufactured by Hitachi (HIT). Below are its specifications, descriptions, and features:

Specifications:

• Manufacturer: Hitachi (HIT)
• Series: 74HC
• Technology: High-Speed CMOS
• Supply Voltage Range: 2V to 6V
• Operating Temperature Range: -40°C to +85°C
• Package: DIP-16 (Plastic Dual In-line Package)
• Logic Family: HC (High-Speed CMOS)
• Number of Inputs: 8 (data inputs) + 3 (select lines)
• Number of Outputs: 1 (complementary outputs: Y and Y̅)
• Propagation Delay: ~13ns (typical at 5V)
• Output Current: ±5.2mA (at 4.5V)
• Input Capacitance: 3.5pF (typical)

Descriptions:

• The HD74HC251P is an 8-input multiplexer with three select lines (A, B, C) that determine which of the eight data inputs (D0-D7) is routed to the output (Y).
• It features a strobe (enable) input (G̅) that, when active (low), allows the selected input to pass to the output. When high, the output is in a high-impedance state.
• The device provides both true (Y) and inverted (Y̅) outputs for flexibility in logic design.
• It is designed for high-speed operation while maintaining low power consumption typical of CMOS technology.

Features:

• High-Speed Operation: Compatible with TTL levels while offering CMOS power efficiency.
• Low Power Consumption: Typical ICC of 4μA (static).
• Wide Operating Voltage: 2V to 6V supply range.
• Complementary Outputs: Provides both true and inverted outputs.
• Three-State Output: Allows bus-oriented applications.
• High Noise Immunity: CMOS technology ensures robust performance.

This IC is commonly used in digital systems for data routing, signal selection, and bus interfacing applications.

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