74AHCT240BQ-Q100X

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74AHCT240BQ-Q100X is from one of the series of devices from NXP Semiconductor, used for analog and digital devices. It is a 8-bit inverting buffer and translator, with Buffer and Transceiver Type as Logic. It is used for switching between digital and Analog voltages, signalling the relatively weak and small signals to the designs. The device requires a low input voltage (as low as 2.0V) and since it supports both 5V and 3V logic, it is widely used in multiple fields. It primarily acts as a translator in the capacitive touch sensing designs.

Application Field

It is used in transceiver and translator applications, mainly dealing with designing both 3V and 5V systems, wherein the output and input goes through the channels in flow-in/out. It finds application in medical as well as automotive field, especially in applications needing motor control, isolated power, heating and air conditioning control. It also finds occasional application in industrial purposes such as interface communication and thereby contributing for the power supplies.

Working Principle

The 74AHCT240BQ-Q100X device mainly acts as an OCTAL Bus-Port Translator, and includes a voltage level translator between 1.8V and 5V. It helps in channeling the data from one logic-level channel/bus to another. The line/bus A, comprising RE/ (Read Enable) and OE/ (Output Enable) pins, represents the first logic - level channel and B represents the second logic - level channel. The output of line A depends on the output of line B, which is enabled and disabled by the OE_/ pin, with the signals across A going high or low depending on the current inputs in line B.

For example, when the OE_/ pin is high, the values on line B will be directly transferred to line A, however may be inverted based on device selection. In case of OE_/ as low, the values in line A and B would be irrelevant, as it is disabled. Thereby, the 74AHCT240BQ-Q100X mainly serves as a connection between two types of logic level, within and across voltage change, for example, between 5V and 3V.

Conclusion

The 74AHCT240BQ-Q100X is an OCTAL Bus-Port Translator and a voltage level translator, between 2.0V and 5V. It finds application in multiple fields such as automotive and industrial purposes and acts as a translator between two logic levels, across voltage change. Its ability to support 5V and 3V logic makes it highly versatile and thereby, is widely used.

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