in this circuit the control line is connected to GND so the output is Z. is there any problem to connect the output line to 1 or 0?
if the control line turns to 1, what happen to the circuit?
what is your answer about the second circuit which is made with transistor?
Electronic – can connecting a tristate buffer output to 0 or 1 make problem
buffercircuit-designpowertri-state
Related Solutions
I think you can do this with a single chip if you use a dual NAND gate with open-drain output like 74LVC2G38 (both gates below have open-drain output):
That runs off 1.65 to 3.3 V and it's available in a 2x3 mm 8-pin package, which is pretty close to SOT-23-sized.
A tristate buffer has a certain minimum time from when the enable is asserted to when its output impedance starts to fall (the drivers start to turn on). Also, it has a certain maximum time from when the enable is negated to when the drivers are fully off (high output impedance).
If the former is not greater than the latter, then you cannot use the same (well, inverted) enable signals directly for two buffers on the same bus; you need to guarantee the timing by other means — either by using different clock edges, or perhaps by using a delay line.
Best Answer
The GND symbol represents metal plates buried in the earth. It should always be drawn pointing down. You can't earth something in the sky.
You need to state in your question whether the buffer is enabled when the enable input is 0 or 1.
There is no problem if the output is in tristate because it is floating.
If the output is not in tristate then it should not be connected to a line that is being pulled high or low by another device. If you do then high currents will result and the logic level will be somewhere in between 0 and 1 so it will be undefined. There should only be one device putting data out on the line.
There is not enough detail.