MC74ACT00DR2G

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The MC74ACT00DR2G is a Quad 2-Input NAND Gate with Schmitt Trigger Inputs. It has been specifically designed to provide high levels of noise immunity, low power consumption and wide common mode ranges while operating on standard supply voltages. These features make the MC74ACT00DR2G an ideal choice for digital applications where reliable performance and high noise immunity are essential. This article will discuss the application field and working principle of the MC74ACT00DR2G.

Application Field

The MC74ACT00DR2G is used in a variety of digital applications. It is typically used as a basic building block for digital logic circuits. It can be used for applications such as:

• Building logic circuits (such as logic gates, Flip-Flops, counters, shift registers etc.)
• Data processing and handling (such as data validating, sorting, filtering etc.)
• Sequencing (such as bus timing, frequency, pulse-widths etc.)

Due to its wide supply voltage of 2.7-3.6V and high fan-out/low power consumption it is also suitable for applications with low power operated environments such as:

• Portable devices
• Battery operated devices
• Medical devices

Working Principle

The MC74ACT00DR2G is a Quad 2-Input NAND Gate with Schmitt Trigger Inputs. It consists of four circuits, each consisting of two CMOS input stages followed by an output stage. The first stage of each of the four circuits is a Schmitt Trigger which performs open-loop wave shaping. The second stage consists of CMOS gates, which are in essence, behind the Schmitt Triggers. This combined Schmitt Trigger/CMOS gate stage provides wave shaping and logic inversion. The combination of these two stages provides the hysteresis, or Schmitt Triggering, characteristic.

The second stage of the MC74ACT00DR2G also provides logic inversion. In a NAND gate, when one of the inputs is at a high logic state, the output is forced to a low logic state. The second stage does this by inverting the input signals, thus allowing the output stage to function as expected. The output stage consists of a power amplifier connected to an open-collector output. If both inputs to the gate are at a high logic state, the output will be pulled to a low logic state.

The MC74ACT00DR2G has a number of desirable attributes. It has low power consumption and a wide range of input common mode voltage; this voltage is the voltage at which the two input signals can vary from each other. This input common mode range from 0V to Vcc makes this device ideal for digital applications — particularly in noisy environments with wide Vinput swings or large amounts of static electricity. Furthermore, due to its Schmitt Trigger Inputs the MC74ACT00DR2G is immune to "switch bouncing" — a common problem with mechanical switch contacts.

The MC74ACT00DR2G is a highly versatile device, and can be used in a multitude of digital applications. Its wide common mode range, low power consumption, and excellent noise immunity make it an ideal solution for digital logic circuits.

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