SN74AS245DWR

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Introduction： The SN74AS245DWR is an 8-Bit FET-Bus (Flow-Thru) Buffer and Line Driver, manufactured by Texas Instruments, Inc. It is an octal driver/receiver device with selectable active open-drain output. It is ideal for buffering and parity verification of expansion buses and other high speed data paths.

Application Field： The SN74AS245DWR is suitable for use in applications such as buffering the flow-thru high speed expansion buses, FET-bus systems, memory systems, and parity checking. The device is capable of controlling up to eight individual lines, each with a switching speed of up to 500nS (nanoseconds), ensuring fast, reliable communication. Furthermore, due to its low power consumption, the SN74AS245DWR is an ideal choice for portable and battery operated systems.

Working Principle： The SN74AS245DWR is an 8-Bit FET-Bus (Flow-Thru) Buffer and Line Driver. It allows multiple drivers to be connected in series, and each has one independent selectable active-open drain output (outputs can be tied together). The output drivers are enabled low. When the required output is enabled, the driver pulls current through the corresponding pin, making it HIGH. This causes the line to be driven to the device’s logic output level. The drivers are designed to pull up to 25mA of current in a high-impedance state and are capable of driving up to 8 lines at up to 30mA each.The device also has two active-low enable inputs (OE1 and OE2) that can be used to enable/disable the drivers. When either input is in the LOW state, the corresponding outputs are disabled and the devices consume minimal current. The SN74AS245DWR also features an active low parity input (PAR) and an active low parity error output (PE). The PAR signal is used in combination with the inputs to the devices to generate an output error signal (the PE signal) when the parity of the inputs is not correct.

Conclusion： The SN74AS245DWR is an ideal solution for buffering and parity highlighting of expansion buses and other high speed data paths. Furthermore, due to its low power consumption, it is an excellent option for use in portable and battery operated systems. With its fast switching speeds, and independent driver/receiver functions, the SN74AS245DWR is one of the most capable devices for FET-Bus, memory, and parity-checking applications.

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