onsemi MC74AC11D: Triple 3-Input AND Gate Datasheet and Application Overview

The MC74AC11D from onsemi is a high-performance, triple 3-input AND gate integrated circuit belonging to the advanced high-speed AC logic family. Housed in a compact SOIC-14 package, this device is engineered to provide system designers with a reliable and efficient solution for implementing fundamental logic functions in a wide array of digital applications. Its key characteristics include high noise immunity and low power consumption, typical of CMOS technology, while simultaneously offering switching speeds comparable to bipolar logic, making it an excellent choice for bridging performance gaps between logic families.

A primary strength of the MC74AC11D lies in its robust output drive capability. With the ability to source or sink up to 24mA of current at its outputs, this gate can directly drive other IC inputs, LEDs, or even low-power relays without requiring additional buffer stages. This simplifies circuit design and reduces component count. Furthermore, the device operates over a broad power supply range of 2.0V to 6.0V, providing significant flexibility for use in both 3.3V and 5V systems. Its internal structure consists of three independent AND gates, each performing the logical function Y = A • B • C. The truth table is straightforward: the output is only high when all three input signals are high.

The applications for the MC74AC11D are extensive. It is commonly deployed in:

Address Decoding: In microprocessor or memory systems, multiple signals can be gated together to generate specific enable or select signals.

Data Validation: Ensuring that a data pulse is only passed through when several control conditions are simultaneously met.

Clock Gating: Controlling the propagation of clock signals to different parts of a circuit to reduce dynamic power consumption.

General Purpose Logic: Serving as a fundamental building block in the implementation of more complex logic functions and state machines.

When consulting the datasheet, designers should pay close attention to absolute maximum ratings, recommended operating conditions, and switching characteristics. Key parameters include a typical propagation delay of 5.5 ns (at 5V, 50pF load), which is critical for timing analysis in high-speed circuits. The device also features balanced propagation delays, which help in minimizing skew between signals.

ICGOODFIND: The onsemi MC74AC11D is a versatile and high-performance logic IC that excels in modern digital design due to its exceptional speed-power product, strong output drive, and wide voltage compatibility, making it a dependable component for ensuring logical integrity in complex electronic systems.

Keywords: AND Gate, Logic IC, High-Speed CMOS, Propagation Delay, SOIC-14 Package.