74AC520SC

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74AC520SC Application Field and Working Principle

The 74AC520SC is a high speed, low power Schottky comparator device designed for fast routine in digital systems. This device is designed for use in general purpose comparison applications. The 74AC520SC is members of the 74AC family of digital logic circuits within the 74XX Logic family.

Features of 74AC520SC

• Low power consumption
• High speed response
• Inputs are TTL-compatible
• Outputs follow ECL levels
• Internal hysteresis

Applications of 74AC520SC

The primary applications of the 74AC520SC are multiplexer/demultiplexer, voting circuits, differential line-driver receivers, and level translation. It can be used in various motion control applications such as automobile and industrial systems where fast analog input detection and high speed comparison is required. It is also ideal for use in digital-to-analog and analog-to-digital conversions.

Working Principle of 74AC520SC

The 74AC520SC utilizes Schottky diode technology to achieve both high speed and low power. The Schottky diodes, along with several internal resistors, form the feedback loops that create hysteresis to reject noise. Hysteresis, also known as “feedback” is produced when the input is compared, and the outputs are inverted based on the result.

The 74AC520SC has a total of four pins, two of which are the inputs, which are configured as pull-up circuits; the remaining two pins are the outputs. Pull-up circuits are controlled by applying voltage to the input pins. When circuit is "off", the input pins are held at logic "0" but when turned on, they are pulled up to logic "1". The internal hysteresis, which is a variation of diode drop, allows the 74AC520SC to operate reliably in noise-prone environments.

The two output pins, OUTA and OUTB, are complementary. While one output is at logic "1", the other output is at logic "0".The output stages of 74AC520SC are designed to invoke ECL levels and thresholds, providing a wider dynamic range than just TTL levels. The result is higher noise immunity, making the device more reliable for applications with high noise.

Conclusion

The 74AC520SC from the 74AC family of logic devices is a high speed and low power Schottky comparator designed for fast routine applications in digital systems. It is ideal for multiplexer/demultiplexer, voting circuits, differential line-driver receivers, level translation, and various motion control applications. The 74AC520SC features low power consumption, high speed response, TTL-compatible inputs, and outputs that follow ECL levels. It also has an internal hysteresis to reject noise.

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