onsemi MC74AC00D Quad 2-Input NAND Gate: Datasheet, Pinout, and Application Circuits

The onsemi MC74AC00D is a monolithic quadruple 2-input NAND gate integrated circuit fabricated with advanced CMOS technology. As a member of the high-speed AC logic family, it is designed for 2-V to 6-V VCC operation, making it compatible with both TTL and CMOS logic levels. This device is renowned for its high noise immunity and low power consumption, typical of CMOS chips, while offering the speed necessary for modern digital systems.

Datasheet Overview

Key parameters from the datasheet define the IC's performance. It features a typical propagation delay of just 5 ns at 5V, enabling its use in high-frequency applications. Each gate has a high output drive current (±24mA), allowing it to drive heavy loads, including multiple inputs and transmission lines. The device operates over a wide temperature range, typically from -40°C to +85°C, ensuring reliability in industrial environments. Absolute maximum ratings, such as supply voltage and input voltage, must be strictly observed to prevent permanent damage to the IC.

Pinout Configuration

The MC74AC00D is housed in a standard 14-pin SOIC package. The pinout is as follows:

Pins 1, 2, 4, 5, 9, 10, 12, 13: Inputs for the four independent NAND gates (A and B inputs for each gate).

Pins 3, 6, 8, 11: Outputs for the four gates (Y outputs).

Pin 7: Ground (GND).

Pin 14: Positive Supply Voltage (VCC).

This standardized pinout is common across many 7400-series quad NAND gate ICs, ensuring easy drop-in replacement and design familiarity.

Application Circuits

The NAND gate is a fundamental universal building block in digital logic, capable of constructing any other logic function. Here are two common application circuits for the MC74AC00D:

1. Basic Logic Function: The primary use is to perform the NAND operation. The output Y goes LOW only if both inputs A and B are HIGH; for all other input combinations, the output remains HIGH (Y = /(A • B)).

2. Oscillator / Clock Pulse Generator: By connecting three of the four gates in a feedback loop with resistors and a capacitor, a simple astable multivibrator can be created. The values of the resistor (R) and capacitor (C) determine the frequency of the output square wave (f ≈ 1/(2.2RC)). This provides a simple and cost-effective clock source for digital circuits.

3. SR Latch (Set-Reset): A basic memory element can be constructed using two cross-coupled NAND gates. This circuit can store a single bit of data, "remembering" which input (Set or Reset) was last activated.

ICGOODFIND Summary

The onsemi MC74AC00D is an exceptionally versatile and robust logic IC. Its combination of high speed, significant output drive, and broad voltage compatibility makes it an ideal choice for a vast array of digital design tasks, from basic logic interfacing and signal gating to creating oscillators and memory elements. Its durability and performance solidify its status as a fundamental component in both prototyping and production environments.

Keywords:

1. CMOS Logic

2. Propagation Delay

3. Universal Gate

4. Pinout Configuration

5. Astable Multivibrator