onsemi MC74ACT00DR2G Quad 2-Input NAND Gate: Datasheet, Pinout, and Application Circuit Guide

The MC74ACT00DR2G from onsemi is a high-performance, quad 2-input NAND gate integrated circuit belonging to the advanced AC/ACT logic family. This device is engineered to provide system designers with a robust combination of high speed and low power consumption, making it a fundamental building block for a vast array of digital applications. Housed in a space-saving SOIC-14 package, it is particularly well-suited for modern, high-density PCB designs.

This guide delves into the key specifications outlined in its datasheet, provides a clear pinout diagram, and illustrates a practical application circuit to demonstrate its utility.

Datasheet Overview and Key Specifications

The ACT family, to which the MC74ACT00DR2G belongs, is designed for operation at TTL (Transistor-Transistor Logic) voltage levels while maintaining CMOS (Complementary Metal-Oxide-Semiconductor) low power consumption. This makes it an ideal interface between older TTL systems and modern CMOS microcontrollers.

Critical absolute maximum ratings and electrical characteristics from the datasheet include:

Supply Voltage (VCC): -0.5V to +7.0V

Input Voltage (VI): -0.5V to VCC + 0.5V

Operating Temperature Range: -55°C to +125°C

Propagation Delay (tPD): Typically 5.0 ns at 5V VCC, ensuring high-speed operation.

Output Drive Capability: Can source/sink up to 24 mA, allowing it to drive multiple inputs or LEDs directly.

TTL-Compatible Inputs: Inputs can be driven directly from 5V TTL sources.

Pinout Configuration

The MC74ACT00DR2G contains four independent NAND gates. The pinout for the standard SOIC-14 package is as follows:

Pin 1: Input A1 (Gate 1)

Pin 2: Input B1 (Gate 1)

Pin 3: Output Y1 (Gate 1)

Pin 4: Input A2 (Gate 2)

Pin 5: Input B2 (Gate 2)

Pin 6: Output Y2 (Gate 2)

Pin 7: Ground (GND)

Pin 8: Output Y3 (Gate 3)

Pin 9: Input B3 (Gate 3)

Pin 10: Input A3 (Gate 3)

Pin 11: Output Y4 (Gate 4)

Pin 12: Input B4 (Gate 4)

Pin 13: Input A4 (Gate 4)

Pin 14: Supply Voltage (VCC)

Power (VCC) and Ground (GND) must be connected to pins 14 and 7, respectively, for the device to function.

Application Circuit Guide: Simple Oscillator/Pulse Generator

A classic application for a NAND gate is creating a simple astable multivibrator or oscillator. This circuit generates a continuous square wave and is perfect for creating a clock signal.

Circuit Description:

1. Components Required: One gate from the MC74ACT00DR2G, one resistor (R), one capacitor (C), and a power supply (5V).

2. Configuration:

Connect the two inputs of one NAND gate together, effectively creating an inverter.

Connect the output (e.g., Y1) to one end of the resistor (R).

Connect the other end of the resistor to one end of the capacitor (C) and to the two tied-together inputs of the gate.

Connect the other end of the capacitor to Ground (GND).

How it Works:

The circuit exploits the propagation delay and switching thresholds of the gate. When the output is high, it charges the capacitor through the resistor. Once the voltage across the capacitor (which is also the input voltage) reaches the gate's high-level input threshold, the output switches to low. The capacitor then discharges through the resistor until the voltage falls below the low-level input threshold, causing the output to switch high again. This cycle repeats indefinitely.

The frequency of the output square wave is approximately determined by the formula: f ≈ 1 / (2.2 R C). By selecting appropriate values for R and C, a wide range of frequencies can be achieved.

ICGOODFIND: The onsemi MC74ACT00DR2G stands out as an exceptionally versatile and reliable component for digital logic design. Its high-speed performance, significant output current drive, and TTL-compatibility make it a superior choice for applications ranging from basic logic signal conditioning and clock generation to complex state machine design and bus interfacing. Its availability in a surface-mount package ensures its relevance in contemporary electronic products.

Keywords:

1. NAND Gate

2. Logic IC

3. TTL-Compatible

4. Propagation Delay

5. Oscillator Circuit