Bipolarity said:So all my 3:8 decoders have outputs only at 1 and 0. I need a tristate decoder that can be configured so that the unused outputs are open circuits (i.e. high impedance).
I know how to build a 3:8 decoder (using logic gates). How might I go about modifying it so that it has tristate outputs? Is this possible?
BiP
berkeman said:Would be easier to just put Tri-State buffers on the 8 outputs of the decoder, no? Or is your goal to build up the 3:8 decoder circuit to learn about it?
Bipolarity said:Thanks! That's actually what I ended up doing once I learned about the tri-state buffer. Do you happen to know the datasheets for the tri-state buffer?
BiP
A 3:8 decoder with tristate outputs is a digital circuit that takes in a 3-bit input and selects one of the eight output lines to be active based on the input. The tristate output means that the output lines can be in a high-impedance state, allowing multiple decoders to be connected together without interference.
The purpose of building a 3:8 decoder with tristate outputs is to reduce the number of input lines required to select one of eight outputs. This is useful in applications where space and complexity are limited, such as in microcontrollers and other digital systems.
To build a 3:8 decoder with tristate outputs, you will need 3 input lines, 8 output lines, and 3 tristate buffers. You will also need to use logic gates, such as AND and NOT gates, to implement the decoder's functionality.
A decoder and a demultiplexer both take an input and select one of multiple outputs based on the input. The difference is that a decoder only has one active output at a time, while a demultiplexer can have multiple active outputs simultaneously. A decoder also typically has fewer input lines than a demultiplexer.
One limitation of using a 3:8 decoder with tristate outputs is that it can only select one output at a time. This means that it is not suitable for applications where multiple outputs need to be active simultaneously. Additionally, the tristate output can introduce additional complexity and potential issues in the circuit design.