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Results tagged with digital-logic
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user 11606
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
What would they mean by this question?
Now it says convert it into NAND AND NOR function forms separately, which is confusing as hell because I don't know if the output is supposed to be the same, if they want 2 completely separate circ …
- 48.7k
20
votes
Accepted
What is a three-state circuit?
Normal push-pull outputs drive the output either high or low by turning one of the output transistors on and the other off. Tri-state outputs can turn both transistors off, effectively cutting off the …
- 48.7k
3
votes
How many gates does a 7400TTL decice have?
A 7400 chip has 4 bipolar TTL NAND gates. Other 74nn chips will have different logic devices. Other 74xx00 chips will use different logic technologies.
List of 7400 series integrated circuits
Texas …
- 48.7k
0
votes
How do I simplify this sum of products expression into an easier sop form
If we break the terms apart, we have 8 (P'VST -> 1000), 6 (PV'S'T -> 0110), 5, 4, 3, 2, 1, and 0. From those we can combine (via Q-M, which combines values with single-bit differences):
3, 2, 1, and …
- 48.7k
2
votes
Accepted
How do I direct input/output to correct circuit module. (2 bit calculator circuit)
The last piece you need is a multiplexer, specifically a 1-of-4 multiplexer such as the 74153. Since you have 4 inputs to the decoder you will need 2 chips at 2 multiplexers per chip. Connect the A an …
- 48.7k
3
votes
Accepted
how to minimize the product of sum from canonical pos?
Like so:
(A+B+C) (A+B+C') (A+B'+C')
= ((A+B+C) (A+B+C')) ((A+B+C') (A+B'+C'))
= (A+B+(CC')) (A+C'+(BB'))
= (A+B+0) (A+C'+0)
= (A+B) (A+C')
- 48.7k
4
votes
Accepted
Construct an AND gate from XOR gates
No. Due to the both complementary and symmetric nature of XOR's inputs and outputs there is no way to configure any number of them to generate an output that does not exhibit the same symmetry.
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0
votes
Design Combinational Circuit
Option 1:
Design a unit to compare two 1-bit numbers. Then add a cascade from a previous stage to the unit. Then cascade multiple units to compare two 4-bit numbers.
Option 2:
Use a Karnaugh map, b …
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0
votes
Implement combinational logic using control input
Use a pulse detector circuit to convert the latch signal into a clock signal.
simulate this circuit – Schematic created using CircuitLab
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4
votes
Accepted
Modern 3.3V CMOS Logic gates
HCMOS (74HC) is still very popular these days due to its wide voltage range and the fact that it still has through-hole packages, but LVC (74LVC) is useful for its lower bottom supply limit, 5V tolera …
- 48.7k
11
votes
What does the value "Z" in the function table for this inverter stand for?
It represents a high impedance (Z) output state. The output will (ideally) neither sink nor source current, nor can it act as a voltage source.
- 48.7k
1
vote
Accepted
4-bit adder carry confusion
Your switches are arranged LSb to MSb, but you're inputting the numbers MSb to LSb. Your schematic shows 0b0010 + 0b1010, with a correct result of 0b1100.
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1
vote
Half Adders and Full Adders connection
If you had put y2, y1, and y0 in the truth table you would have noticed that this circuit adds x0, x1, x2, and x3 and outputs the sum as y.
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1
vote
Is it possible to exchange the content of two registers in a single clock pulse?
Exchanging registers in a single cycle is only possible if both registers can present themselves as input to the other register at the same time. Only a single register can emit to the bus at any time …
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3
votes
Accepted
Ground Fluctuations
When the transistor is off, the positive lead is effectively floating, and therefore picks up the 50Hz emissions from the power facilities permeating the building.
- 48.7k