Microprocessor Interface Design: Digital circuits and by J. D. Nicoud (auth.)

By J. D. Nicoud (auth.)

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Drivers for the IEEE488 standard are characterized by grouped control lines due to the bus definition. 50 Combinational logic We will not deal here with RS232 and long line command circuits, which send information through a coaxial or twisted cable while heeding its characteristics. 4c. 39a) or to let modulated signals flow conditionally from one level to another. 39c) function. These assemblies are only suitable for low frequencies. a) v. :.. in::""'=00-=~ G1 Vin~ G2 Vout lkn Fig. 39 Application examples for an analog switch and FET transistor.

4<:), which is only found at the internal level of the circuit or in special applications. Multiplexors are used to select one of many inputs. Demultiplexors do the opposite; they are interchangeable with decoders and the select input corresponds to the enable input of the decoder outputs. g. to the high level inputs, which is precisely why they are known as priority encoders. 2Sb have various alternatives with three-state outputs, input registers, etc. and will be discussed in the following sections.

For line filtering. The propagation time of a Schmitt trigger gate is about twice that of a normal gate in the same technology. Switch-over thresholds depend on the logic family and on the type of circuit. They can even vary from one manufacturer to another. This influences applications in which the input changes slowly. 7. 1 Buffered outputs When controlling heavily loaded lines such as a clock or a bus line, it is necessary to use amplified output gates called buffers (power drivers). They are characterized by the current they can alIDrb while guaranteeing a good "0" state (this state is the most difficult one to guarantee in TTL) and a good "1" state.

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