What are those things that look like concatenated hourglasses in the (TTL) circuit of Question 3?
https://www.docdroid.net/1L1FeI3/question3.pdf
I'm trying to fully understand how to solve that problem, but I don't even know what to search for, hence this question.
Any input would be GREATLY appreciated!
What are those things that look like concatenated hourglasses in the included (TTL) circuit?
2018-05-11 9:50 am
回答 (5)
2018-05-12 5:05 am
f//k knows - and it aint TTL technology
2018-05-11 7:27 pm
Because they do represent digital switches you notice that they are always used in pairs.
The pair either is a NOT gate if the not switch is on the supply side,
or a YES gate if the not switch is on the earth side.
The reason for grouping them into four blocks is that the circuit design must preclude ANY possibility of a conductive path all the way to earth.
The pair either is a NOT gate if the not switch is on the supply side,
or a YES gate if the not switch is on the earth side.
The reason for grouping them into four blocks is that the circuit design must preclude ANY possibility of a conductive path all the way to earth.
2018-05-11 12:46 pm
The symbols are transmission gates - just think of them as relays or even transistors.
TTL has nothing to do with this. TTL is based on NAND gates implemented using a weird BJT (transistor) with two bases.
The circuit is in fact typical of CMOS logic and in this context you can reasonably think of a single CMOS FET as a transmission gate (or a relay or a transistor).
TTL has nothing to do with this. TTL is based on NAND gates implemented using a weird BJT (transistor) with two bases.
The circuit is in fact typical of CMOS logic and in this context you can reasonably think of a single CMOS FET as a transmission gate (or a relay or a transistor).
2018-05-11 10:23 am
I would say those are transmission gates. When the control input is a logic "0", the gate is off (high resistance). When the control is "1", the gate is on (low resistance). If the input goes into a tiny circle, then it is negated.
2018-05-11 10:21 am
They are switches, and there are two types. The ones with XX, let the vertical signal pass when the horizontal input is a 1. The other switches with a bubble oXX let the vertical signal pass through when the horizontal input is low (0)
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