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Transistor Transistor Logic. Logic circuits built from bipolar transistors and resistors.

2
votes
the ULN2003A datasheet here only states the maximum voltage that can be sinked, which is 50v. First, we don't talk about "sinking" voltage. We sink current. The spec you're referring to says that …
answered May 6 '15 by The Photon
0
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First, ignore R1 for now. It doesn't do anything except make sure the circuit can source current when the TTL gate is in the low state. Now it looks like you have two equations and two unknowns … ECL circuit's VEE. Another option might be getting rid of R1 and using the fact the TTL gate can't source current in the low state to your advantage. A third resistor from the TTL output to ground could help here. …
answered Mar 16 '17 by The Photon
3
votes
You probably have some load connected to the output when you measured it with the 'scope. If the equivalent resistance of the load is less than maybe 50 kohms, and it's pulling toward ground, your 1 …
answered Oct 17 '17 by The Photon
5
votes
I think that nowadays if you're dealing with things at the gate level, you're not working in the area of "computer architecture", you're really just doing basic digital electronics. But also, you can' …
answered Dec 5 '11 by The Photon
2
votes
I am referring to the polarity of the current when considering polarity of logic levels. Specifically, the fact that maximum operating condition of -800uA for a logic level high is non-intuitive. …
answered Mar 22 '15 by The Photon
19
votes
. They're basically the same old functions as TTL logic, but usually only one or two gates in a package. And the packages are microscopic things like SOT23 or SC70. If you just need an inverter or an AND …
answered Dec 8 '11 by The Photon