onsemi MC74ACT10D: A Deep Dive into the Triple 3-Input NAND Gate

The MC74ACT10D from onsemi is a high-performance, triple 3-input NAND gate integrated circuit belonging to the advanced high-speed CMOS (ACT) logic family. This device is engineered to provide a robust interface between TTL levels and CMOS environments while offering superior speed and lower power consumption. It is an essential component for a wide array of digital design applications, from basic logic gating to complex system control.

This article provides a comprehensive overview of the MC74ACT10D, detailing its specifications, pin configuration, and practical circuit examples.

Datasheet Overview and Key Specifications

The MC74ACT10D integrates three independent 3-input NAND gates within a common 14-pin package. Its key electrical characteristics, derived from its datasheet, make it suitable for high-speed, noise-sensitive environments.

Logic Family: Advanced CMOS (ACT)

Supply Voltage Range (VCC): 4.5V to 5.5V (Standard 5V operation)

High-Speed Performance: Very low propagation delay (typically 5ns at 5V)

TTL Compatibility: Directly interfaces with TTL outputs; inputs have TTL threshold levels.

Output Drive: Capable of sourcing/sinking 24mA, enabling it to drive relatively high loads.

Low Power Consumption: Features significantly lower quiescent current than equivalent bipolar (LS) logic parts.

Packaging: Typically available in a 14-pin SOIC-14 package (suffix 'D').

These specifications highlight the device's role as a reliable and efficient solution for buffering and logic operations in mixed-voltage systems.

Pinout Configuration

Understanding the pinout is critical for circuit design and PCB layout. The MC74ACT10D in a 14-pin SOIC package has the following pin configuration:

Pin 1: Input A for Gate 1

Pin 2: Input B for Gate 1

Pin 3: Input C for Gate 1

Pin 4: Output Y for Gate 1

Pin 5: Input A for Gate 2

Pin 6: Input B for Gate 2

Pin 7: Input C for Gate 2

Pin 8: Output Y for Gate 2

Pin 9: Input A for Gate 3

Pin 10: Input B for Gate 3

Pin 11: Input C for Gate 3

Pin 12: Output Y for Gate 3

Pin 13: Ground (GND)

Pin 14: Supply Voltage (VCC)

The standard 14-pin SOIC-14 package offers a compact footprint for space-constrained applications.

Application Circuits

The NAND gate is a universal gate, meaning any other logic function can be constructed from it. The triple configuration of the MC74ACT10D provides designers with flexibility.

1. Basic 3-Input Logic Gating:

The most straightforward use is to perform the NAND function: the output is LOW only if ALL three inputs are HIGH; otherwise, the output is HIGH. This is fundamental for decoding and enable/disable control logic.

2. Implementing Other Logic Functions:

A single 3-input NAND gate can be reconfigured to create other gates:

Inverter (NOT Gate): Connect all three inputs together.

2-Input AND Gate: Connect two inputs together and use the third as an enable, or use two NAND gates (first as a NAND, second as an inverter).

2-Input OR Gate: Requires three NAND gates configured with inputs inverted (using additional NAND gates as inverters).

3. Oscillator / Pulse Generator:

By connecting the outputs back to the inputs through resistor-capacitor (RC) networks, the MC74ACT10D can be used to create a simple astable multivibrator or a Schmitt trigger oscillator for clock generation. The switching speed of the ACT family allows for the creation of high-frequency clock signals.

4. Address Decoding:

In microprocessor or memory systems, multiple address lines must be combined to select a specific device. A 3-input NAND gate is perfect for decoding a specific binary address combination, generating a active-LOW chip select (CS) signal when the correct address is present.

5. Data Validation:

The gate can be used as a "checker." For example, in a system with three enable signals, the NAND gate's output can flag an error condition if all three are ever accidentally asserted simultaneously.

ICGOODFIND Summary

The onsemi MC74ACT10D stands out as a versatile and high-performance logic IC. Its TTL-compatible inputs and strong output drive capability make it an ideal choice for interfacing and signal conditioning in legacy and modern 5V systems. The integration of three gates in one package offers excellent functional density, simplifying board layout and reducing component count. Whether used for basic logic, signal generation, or complex decoding, the MC74ACT10D provides a reliable, fast, and power-efficient solution for digital designers.

Keywords:

MC74ACT10D

3-Input NAND Gate

TTL-Compatible CMOS

SOIC-14

Logic Gate IC