hello I need to make a hex inverter out of transistor transistor logic or better transistor resistor logic. anyone could help?
I need to substitute the mc789ap chip
No keith. I cannot find the datasheet. But it is TTL, so the voltage levels should be compatible with TTL. I would say drive current is not of much importance to my application.
It would be fun If I could build a hex inverter out of transistors instead. maybe it is just as simple as the attached image (although RTL) but I just want to make sure.
This is two input, but it can be converted to one if using just one transistor I think
yes, if you connect two inputs together it becomes an inverter
What about the next one which is simpler and using just one transistor? Please omit one of the two resistors, they are from another application.
The output goes to zero if a one has been received.
Yes, a simple transistor inverter with resistive load would work. You probably need to put a resistor from base to ground because it would start to turn on at 0.8V - a TTL low. Around 10k would do.
It works. Why dont you try to simulate it? You will see and make sure that it works.
Here is an example one transistor inverter and its transfer characteristic: **broken link removed** **broken link removed**
One thing to consider, how fast your inverter is supposed to work. You may need fast transistors.