SN74ABT543APW

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SN74ABT543APW Application Field and Working Principle

SN74ABT543APW belongs to the logic family of Buffers, Drivers, Receivers, Transceivers. It is a high-speed, low-power, bipolar transistor octal high-gain, open drain inverter, that operates from 2.3V to 5.5V.

The SN74ABT543APW has an input logic sense of CMOS/LVTTL, and is able to drive an output load of 8 open-drain N-channel MOSFETs. It also has slew-rate control inputs, which allow to control of the rate of the output change. The switched output capacitive load range is from 1 nF to 25 pF.

In addition, it comes with bus hold circuitry that retains the state of the bus line when the input signal is below the logic threshold and returns it to opposite level when the input signal is at the logic threshold.

Application Field

The SN74ABT543APW complete integrated octal buffer/inverter is a very useful and versatile device in a great array of fields. These are some of its applications:

• Peripheral interconnections and expansion buses
• Termination and buffer circuits
• Bus Oriented logic interfacing
• Test systems and logic inverters
• Bidirectional translation between various levels of signal

Working Principle

At the operational level, the SN74ABT543APW is equipped with two independent control pins, Schmitt triggers to help monitor signal levels. The device can handle up to 8 individual buffer/inverter channels, each with its own Schmitt trigger input that helps to determine the signal polarity of the resulting output. This means that the signal input is either active High or active Low, depending on the configuration.

The output of the SN74ABT543APW is either in VCC or in GND condition, depending on the status of the input signal. In other words, an active low is inverted (1 to 0) and an active high is complement (0 to 1).

The reason why different Schmitt trigger inputs are used, is that the device is self-clocking, which helps to increase its speed and reduce noise levels. This helps to make sure that the signal amplitude is always within the operating margin of the device, no matter what kind of changes occur in the input signal.

Furthermore, the device also provides a power-on reset that helps to reset the system in the event circumstances change and the device fails to respond correctly. This is done by monitoring the power supply for level changes and resetting the system when that happens.

Lastly, the SN74ABT543APW has bus hold circuitry, which is used to retain the state of the bus line when the input signal is below the logic threshold. This helps to reduce power consumption and increase the MCU’s flexibility as well.

Conclusion

In conclusion, the SN74ABT543APW is a very versatile and reliable device which can be used in a wide variety of applications and is able to handle up to 8 individual buffer/inverter channels and provide power-on reset and bus hold circuitry to help ensure correct operation. It is designed for high-speed, low-power operations and is suitable for use with LVTTL/CMOS/LVCMOS signals.

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