74VHC27M

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74VHC27M Application Field and Working Principle

74VHC27M, which belongs to Logic - Gates and Inverters, is a high-speed CMOS quad 2-input NAND gate integrated with VHC technology. It has four independent 2-input NAND gates, each gate perform the logic NAND function. It has very high speed performance and wide operating voltage range. It is suitable for unfamiliar logic circuits and low power applications.

Features

• Low supply current
• Wide operating voltage range
• High noise immunity
• High speed performance

Application Field

The application field of 74VHC27M is quite wide. It can be used in clock circuits, shift registers, touch disabled switches, pulse generators and counters, which has requirement of low power consumption.

Working Principle

As a four independent 2-input NAND gate, 74VHC27M can realize the logic function of NAND. It looks like a two-input AND gate, followed by one NOT gate. The truth table of the NAND gate is shown in Figure 1. Figure 1: Truth Table of NAND Gate

The logic equation of the NAND gate can be expressed as:

Q = A*B = A·NOT(A·B) (1)

Circuit Diagram

Figure 2 shows the circuit diagram of 74VHC27M.

From the circuit diagram, the 74VHC27M consists of four identical subcircuits. Each subcircuit has two transmission gates, a sense amplifier and an active load. The two transmission gates are used to define the logic gating, while the sense amplifier is used to amplify the current in order to reduce the power dissipation. The active load is used to reduce the dynamic power. With the help of these three components, 74VHC27M can perform the logic NAND function.

Conclusion

74VHC27M, which belongs to Logic - Gates and Inverters, is a high-speed CMOS quad 2-input NAND gate. It has wide application field, like clock circuits, shift registers, touch disabled switches, pulse generators and counters. Its working principle is simple and clear. It consists of four identical subcircuits, each containing two transmission gates, a sense amplifier and an active load. With the help of these components, it can perform the logic NAND function with high speed and low power.

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