74AC521SCX

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The 74AC521SCX is a quad differential line driver and receiver featuring adjustable hysteresis. It has been optimized for low-power operation, having a standby current per channel of less than 1.5 mA and an active current per channel of less than 12 mA. As a result, it is suitable for battery-operated applications.

Application Field

The 74AC521SCX is typically used to drive a transmission line or to interface two systems that use different logic standards. It provides superior EMC performance over long transmission lines due to its low integrated capacitance and adjustable hysteresis. It can be used in a wide range of applications, including telecom/datacom systems, digital video broadcast (DVB), Ethernet, Fiber Channel, USB, and audio/visual equipment.

An example of using 74AC521SCX is an analog-to-digital converter (ADC) interface. The ADC senses a current or voltage analog signal, and converts it into a digital value for further processing. A differential line driver can be used to drive the analog signal from the ADC to make it more suitable for transmission. The adjustable hysteresis of the 74AC521SCX helps reduce noise and improve noise immunity.

The 74AC521SCX is typically used as an interface between two systems that operate at different logic levels. It receives a logic output from one system and translates it into a logic output compatible with the other system. For example, it can be used to interface between a 5V logic system and a 3.3V logic system. The adjustable hysteresis helps ensure reliable operation in cases where the input and output levels are close to each other.

Working Principle

The 74AC521SCX is a differential line driver and receiver. It consists of four channels, each of which has an output driver and a receiver. The receiver has adjustable hysteresis, which prevents false triggering of the output driver. All differential inputs and outputs are internally pulled up to VDD.

The output driver is designed to drive a balanced differential signal, which typically consists of two complementary signals (A and B). When the input signal is high, the output driver drives a high voltage on the A line, and a low voltage on the B line. When the input signal is low, the output driver drives a low voltage on the A line, and a high voltage on the B line. This helps reduce noise and ensure reliable operation.

The receiver has adjustable hysteresis, which prevents false triggering of the output driver. The hysteresis can be adjusted by a single external input voltage. Higher hysteresis requires a higher voltage, and vice versa. The hysteresis helps prevent switching of the output driver due to noise or other transient signals.

The 74AC521SCX is powered by a single 3.3V supply and can operate from 0°C to 70°C. It is available in a space-saving 44-pin TQFP package. The power-down feature helps reduce power consumption to a minimum when the device is not in use. The low current per channel and the small form factor makes the 74AC521SCX an ideal candidate for battery-operated and space-restricted applications.

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