SN74AVCH4T245PW

Logic - Translators, Level Shifters - SN74AVCH4T245PW

The SN74AVCH4T245PW is a 4-bit translator device, used for level shifting and logic conversion between DIFFERENT voltage and logic families. It is designed specifically to bridge two different logic families that operate over different voltage levels. The device is designed specifically to support the types of applications where level shifting between two different logic families operating over different voltage levels is required.

Features

The SN74AVCH4T245PW is a pocket-sized dual rail translator device, allowing for 2 different logic families to come together in the same device. It is equipped with an independent enable input for each translator, allowing for output control to be available in situations where one or the other logic family is not needed or connected.

The device supports both 3.3V and 5V logic to the I/Os, with a maximum voltage of 6V. It also supports hot plugging and steaming, with a switching speed of up to 200MHz. The SN74AVCH4T245PW provides TTL and CMOS level compatibility, with a minimum of 1V and maximum of 6V.

Applications

The SN74AVCH4T245PW dual rail translator is used to bridge logic levels between 3.3V and 5V logic families for general-purpose logic control, low-noise data transfer, signal level shifting, and signal conditioning. It can help alleviate glitches in fast signal transitions created by power supply bounce or load behavior. It is also ideal for interfacing with high-speed digital signal processing or audio applications. It is used for a variety of common applications, including I/O, digital logic expansion, and current loop applications.

Working Principle

The SN74AVCH4T245PW translator device utilizes hot-plug and streaming compatible I/O pins to provide an efficient level shifting between two different logic families that are operating at different voltage levels. The device works by enabling one logic family (receiving level A) through the enable input, setting the on-chip logic to manipulate the data received, and producing either a 1 or 0 depending on the logic level received. The output data is then buffered and presented on level B.

The SN74AVCH4T245PW also complements existing I/O with an integrated pull-up/pull-down resistor in the output section, allowing for greater flexibility in the level translation process. When the enable input is held low, the associated channel will pull the output high. When the enable input is held high, the associated channel will pull the output low.

In addition, the device’s static CMOS- and TTL-compatible I/O design, with no internal pull-up or pull-down resistors, prevents voltage runaway. It can support up to 6V at TTL levels and up to 8V at CMOS levels. The SN74AVCH4T245PW also has an internal thermal sensing monitor to alert the user of hot plug events.

Conclusion

The SN74AVCH4T245PW is an ideal device for level shifting between two different logic families operating at different voltage levels. It is small, inexpensive, and provides the user with features such as output control and voltage runaway prevention. Furthermore, the device supports TTL- and CMOS-compatible logic levels, with a maximum voltage of up to 8V, and offers high-speed data transfer, hot plugging, and streaming capabilities.