74HC27 Triple 3 input NOR Gate IC (7427) DIP 14 Package

74HC27 Triple 3 input NOR Gate IC (7427) DIP 14 Package

The 74HC27 is a Triple 3-Input NOR Gate IC from the 74HC (High-Speed CMOS) logic family.
It contains three independent NOR gates, each having three inputs, and provides the logical NOR function — meaning the output is HIGH only when all inputs are LOW.

This IC is widely used in digital logic circuits, signal processing, and control systems, where multiple input conditions must be combined into a single output signal.

It features high noise immunity, low power consumption, and CMOS-level compatibility with both TTL and CMOS logic systems.

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Functional Description

The 74HC27 performs the NOR operation with three inputs per gate.
Each output is LOW if any one or more inputs are HIGH.
Only when all inputs are LOW does the output go HIGH.

It’s ideal for logic decision-making circuits, such as when an output signal must be generated only if none of several input conditions are active.

Applications

• Logic decision circuits (detecting “no input active” condition)
• Digital control systems
• Signal inversion and combination
• Pulse shaping and gating
• Microcontroller logic interfacing
• Alarm and fault detection systems
• Timing and control logic

74ls27-ic-datasheet