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Results tagged with digital-logic
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user 157935
Digital electronics treats discrete signals, unlike analog electronics which treats continuous signals. Digital logic is used to perform arithmetic operations with electric signals and constitutes the base for building CPUs.
1
vote
How much current can a 74HC00 supply?
Unfortunately, this datasheet does not have a plot of the decrease in output voltage with increasing output current. However, section 8.3 restates the 4 mA figure, so I would take that as a recommend …
- 23.2k
0
votes
Noise margins logic circuits
For any logic family, there is no one simple number that defines its noise margin. Because of this, you usually cannot use a single noise margin number to compare the relative noise immunities of dif …
- 23.2k
1
vote
7-Segment display won't light up fully for each number in 2-Bit Counter
schematic, Schematic, SCHEMATIC, S.C.H.E.M.A.T.I.C
In the communication of electrical engineering concepts, there is nothing more important than a schematic. To paraphrase Rear Admiral Joshua Painter …
- 23.2k
1
vote
Why would the intersection of logic 1 and logic 0 results in logic 0?
Why would the intersection of logic 1 and logic 0 results in logic 0?
It doesn't have to. The logic result of two inputs depends on the type of logic function used. If the two inputs (x and y) go …
- 23.2k
1
vote
Knight Rider LEDs
With inverters and multiplexers, I think you are heading down a relatively complex path. Search for knight rider schematic to see how others have solved this.
Once you have a flipflop that is set and …
- 23.2k
4
votes
Accepted
What is this symbol (for an inverter)?
It is not a mistake and it is not a delay. It is adherence to the letter of old school rules about how to indicate logic polarity.
The bubble indicates whether the input/output is positive-true (no b …
- 23.2k
0
votes
Logic level converter with voltage selector
Yes. Vcca must always be less than Vccy. Or equal to.
Yes.
pay careful attention to the input-output voltages on page 3 of the datasheet.
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3
votes
Creating a logic circuit to produce a binary series of specific length and pattern
Your pattern is a simple clock pulse with every fifth 1 state gated to be a 0. This can be achieved with either a Johnson decade counter or a 4-bit binary counter, plus a quad NAND gate.
UPDATE:
A mo …
- 23.2k
4
votes
Accepted
Switch logic circuit
Functionally, you need three 3PST switches and a stepper. Electrically, the stepper can be a CD4013 wired as a switch debouncer plus 2-bit counter. With 1x4 analog muxes, this gives four states in c …
- 23.2k
1
vote
CD4013 timing question
The set and reset are asynchronous. They are not affected by the clock, so they do not have a setup time spec. Most 4013 datasheets have some kind of internal logic diagram.
In a master-slave flipfl …
- 23.2k
8
votes
Accepted
Definition of "High-Impedance State" 74HCT and similar
My question is this: what does an input see when connected to a Hi-Z output?
An almost perfect open circuit.
U1 is called a "tri-state" device. Each output pin has three defined conditions: logica …
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0
votes
How do I make an AND gate from transistors?
The problem might be leakage current. If so, the solution is to add two resistors to your circuit.
Add one 10 K resistor from the base of Q1 to GND. Add another 10 K resistor from the base of Q2 to …
- 23.2k
3
votes
How to make a 5-minute down counter using flip-flops?
5 minutes is 300 seconds. You don't specify a clock frequency in your post, so as others have said, let's assume a 1 Hz clock signal. You don't say if you need to show the count in a typical digital …
- 23.2k
0
votes
Problem with LED driver - LEDs do not switch on when button is pressed
The maximum recommended total output current is 20 mA. Per the datasheet, the minimum current setting resistor value is 24K. The driver might be shutting down due to overtemperature caused by overlo …
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0
votes
Force the output of an SR latch with a Zener diode
Been doing this since the 60's, and I've never heard of that trick. Also, it won't work.
What will work is reversing the zener diode. Now, whenever Vo2 is high, the zener diode will forward-conduct …
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