TTL INVERT

110

01:08:07

Trying to understand fundamental properties of transistors.
If I'm correct the transistor on the left when operating is in reverse active mode, and the one on the right is in saturation/cutoff mode.

published 7 years ago

BillyT

7 years ago

The transistor on the left is being used as a diode, check out the enclosed circuit, http://everycircuit.com/circuit/6350838695198720

eekee

7 years ago

@BillyT: I think it controls base current, not sure. It also acts as a pull-up resistor which is a feature of TTL. Anyway, it's the way real TTL is wired. Search the web for ttl logic gate circuit diagram

eekee

7 years ago

Two pages which explain TTL; the first goes into detail about that first transistor: https://www.allaboutcircuits.com/textbook/digital/chpt-3/ttl-nand-and-gates/ ; https://www.electrical4u.com/transistor-transistor-logic-or-ttl/

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