SN74ALS640BDWRE4

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The SN74ALS640BDWRE4 is a device developed by Texas Instruments that belongs to the Logic-Buffers, Drivers, Receivers, Transceivers category. It is an 8-bit universal bus driver utilized to interface various bus architectures to any application needing logic-level translations. It is equipped with an asynchronous external reset and utilizes a single five volt power supply. In addition, the SN74ALS640BDWRE4 provides glitch-free bus transfers and dynamic bus hold, facilitating bidirectional data flow.

SN74ALS640BDWRE4 application field

The SN74ALS640BDWRE4 is widely utilized for bridging two different buses or for multiplexing one bus to many other buses. Its applications span several different types of electronic devices such as automotive (for engine and cab electronics) as well as medical and industrial applications. The following are some of the specific applications in which SN74ALS640BDWRE4 is good fit:

• Handheld Devices: The SN74ALS640BDWRE4 bridges the CPUs and the peripheral devices such as audio amplifiers and Flash memory. It can also multiplex the peripheral devices to the CPU.
• Telecommunication Systems: The SN74ALS640BDWRE4 can bridge the control and data buses and multiplex the data buses to multiple peripherals.
• Industrial Automation: The SN74ALS640BDWRE4 bridges the motion control ecosystem such as motion controllers and drive controllers. It can also multiplex the multiple motors to the motion controller.

SN74ALS640BDWRE4 working principle

The SN74ALS640BDWRE4 utilizes the following principles to achieve its universal capability:

• Bus bridge / Multiplexing: The SN74ALS640BDWRE4 is able to bridge the logic between two bus architectures or multiplex the one bus to many. It achieves this by having a separate data input and output pair for each port.
• Asynchronous Reset: The asynchronous reset input provides logic reset and system reset capability. This ensures that the SN74ALS640BDWRE4 is in a known state for every active cycle.
• Dynamic Bus Hold: The dynamic bus hold function, built into the SN74ALS640BDWRE4, allows the device to monitor the bus and repeat previous logic levels when the bus goes quiet.

The SN74ALS640BDWRE4 also has two separate control pins for each port that are used for controlling direction and read/write operations. In addition, its internal data storage also ensures a glitch-free transition between ports, facilitating bidirectional data flow.

Conclusion

The SN74ALS640BDWRE4 is a device developed by Texas Instruments that belongs to the Logic-Buffers, Drivers, Receivers, Transceivers category. It is an 8-bit universal bus driver utilized to interface various bus architectures to any application needing logic-level translations. It is used in a variety of applications such as automotive, medical, and industrial automation. It utilizes a range of principles such as bus bridge/multiplexing, asynchronous reset, and dynamic bus hold to achieve its universal capability. It is an integral part of many electronic designs and its use is expected to continue expanding in the future.

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