onsemi MC74AC05DR2G: Hex Inverter with Open-Drain Outputs

The onsemi MC74AC05DR2G is a high-performance, hex inverter integrated circuit designed for a wide range of digital logic applications. As part of the advanced high-speed AC logic family, this device is built with open-drain outputs, a feature that significantly enhances its flexibility in interfacing with different voltage levels and bus-oriented systems.

Each of the six inverters in the package features an open-drain output stage. Unlike a standard push-pull output that actively drives a signal high or low, an open-drain output can only pull the signal line to a low logic level (ground) or leave it in a high-impedance (floating) state. To achieve a logic high level, an external pull-up resistor must be connected between the output pin and the desired supply voltage (Vpull-up). This key characteristic allows the MC74AC05DR2G to perform critical functions such as wired-AND connections, where multiple outputs can be tied together to a common bus line without causing contention, as only one device actively pulls the line low at a time.

This functionality makes it exceptionally useful for interface level shifting. For instance, it can effortlessly translate signals from the chip's core logic (e.g., 3.3V or 5V) to a higher voltage level required by another component in the system, simply by connecting the pull-up resistor to the different voltage rail. Furthermore, it is ideal for driving indicator LEDs or other devices where the current sink capability is beneficial.

The device operates over a broad voltage range from 2.0V to 6.0V, providing compatibility with various logic families including TTL. It offers high noise immunity and robust output drive, characteristics synonymous with the AC logic series. Housed in a space-saving SOIC-14 package, the MC74AC05DR2G is a reliable and efficient solution for designers looking to simplify bus management, reduce part count, and increase system design flexibility.

ICGOOODFIND: The onsemi MC74AC05DR2G is an essential logic IC that provides design engineers with superior flexibility for bus interfacing, level translation, and wired logic applications through its robust open-drain outputs.

Keywords: Open-Drain Outputs, Hex Inverter, Level Shifting, Wired-AND Logic, Bus Interface