SN74AHCT244DWR

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The SN74AHCT244DWR is a high-speed octal bus transceiver designed for of low-voltage (3.3-V) VCC applications. It is designed for asynchronous 2-way communication between data bus lines. It has two independent data buses, each composed of 4 non-inverting buffers, the A port and the B port. The direction of the data on each port is specified by two control inputs, one for each port (DIR A, DIR B).

The application fields for SN74AHCT244DWR can be broadly segmented as follows:

• PCI Express applications;
• USB Video applications;
• Cellular communications;
• Power line communications;
• High-speed serial links.

The working principle of SN74AHCT244DWR is that data is passed between commonly connected devices and/or buses, often as part of a bridge or other transmission arrangement between two buses or within a single device. Where multiple devices are using the samebus, each device will interact with the SN74AHCT244DWR in the same way. The transceiver works by first sampling the state of each of its two input data buses on each rising edge of the port control signal (DIR A, DIR B).

When the port control signal is low, data flows from the bus on which the control signal is applied to both buses, respectively. When the port control signal is high, data flows from both buses to the bus on which the control signal is applied. The transceiver then forwards the sampled value from the paired input bus to the paired output, completing the cycle and forming the data connection.

The SN74AHCT244DWR is not just a bridge between two data buses, but also a driver for each bus. This feature allows it to drive each data port to a logic level (1 or 0) determined by the input signal from the opposite side. This makes it possible to avoid voltage drops when switching between buses, which is an essential part of ensuring reliable long-term operation.

In summary, the SN74AHCT244DWR is a high-speed octal bus transceiver designed for low-voltage (3.3V) VCC applications, working by first sampling the state of each of its two input data buses on each rising edge of the port control signal (DIR A, DIR B) and then forwarding the sampled value from the paired input bus to the paired output. Its application fields include PCI Express applications, USB Video applications, cellular communications, power line communications, high-speed serial links, and its augmentations as a signal driver make it possible to avoid voltage drops when switching between buses.

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