74ABT646CSC

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Logic - Buffers, Drivers, Receivers, Transceivers

The 74ABT646CSC is a high-speed, low-power, CMOS logic buffer targeted for backplane applications. It is characterized for operation from 0°C to 70°C. This logic buffer can be used to expand the bus width of a system or to provide signal buffering in fanout applications such as clocks, control signals, address, and data. It is designed with a common enable signal, input signal, and output signal configuration.

The 74ABT646CSC has an input voltage range of 1.5V to 3.6V and an output voltage range of up to 5V. This buffer has a propagation delay of 3.7ns at 3.3V and 3.2ns at 5V. It also has an enable voltage range of 1.9V to 5.5V and a supply current of up to 2mA. The logical level is guaranteed up to the specified voltage range.

The 74ABT646CSC includes a handful of key features of which allow it to perform high-speed buffering of input signals. Firstly, it has software configurable active low and active high enable inputs to reduce power when not enabled. Secondly, it has a large fan-out of 24 with a low output impedance which behave effectively to ensure proper system timing. Thirdly, the polarity of outputs can be controlled via enable pin as either active-high or active-low.

In terms of working principles, the 74ABT646CSC has a design which is based on the logic gates of a transmission gate approach. Along the lines of a transmission gate, the signal is transmitted through gates and the output will reflect input at the other side. Upon the signal arriving at the other side, it is held in the buffers until the next signal reaches. This action can be appended as logic operations and can allow the signal to be buffered, routed and driven in one direction with certain strength through the output.

The applications of the 74ABT646CSC includes memory decoders, clock distribution, data buffering, interrupt handling and power-on reset buses. Its high speed buffering capabilities and its output powering capability make it possible to fanout and drive multiple gates, FPGAs and ASICs simultaneously. This functionality results in improved timing and better control of bus signals.

In conclusion, the 74ABT646CSC is a low-cost, high-speed logic buffer which is great for applications such as memory decoders, clock distribution, data buffering, interrupt handling and power-on reset buses. The 74ABT646CSC features an improved input and output configuration which enables it to perform high-speed buffering of signals. Most importantly the advantages of this buffer are its high fan out, low output impedance and configurable logic levels.

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