![]() ![]() ![]() Such a combination would be desirable, particularly for passing bi-directional TTL logic signals on a wire-or bus typical of what is found in the PC-AT keyboard, namely clock and data signals. Presently, there are no low impedance devices which combine the data path selection of a multiplexer with the asynchronous bi-directional communication of an analog switch. This impedance requires a proportional increase in the voltage of the circuit which drives such a switch. They also have input impedances which are too high (about 200 ohms maximum). ![]() Multiplexers and de-multiplexers perform data path selection, but do not support asynchronous bi-directional communication.Īnalog switches control bi-directional communication, but do not support data path selection. The present invention relates to communication switching circuitry, and more specifically to a multi-stage analog bi-directional selector.
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