All Questions
Tagged with logic-level digital-logic
72
questions
0
votes
2
answers
98
views
What does Vdd and Voh mean?
I truly apologize if this question title is vague I don’t really know entirely what to ask. I’m a programmer interested in computer architecture and I’ve been reading a book about digital design. ...
- 1
0
votes
2
answers
50
views
Will the frequency change when converting the ESP32 3.3 V logic to 5 V logic using a TXS0108E?
The GPIO on ESP32 (S3) are all 3.3 V logic. I want to control an ESC for a drone. The manufacturer says:
The ESC will use a standard 5 V PWM signal at 50 Hz between 1100 µs and 1950 µs. 3.3 V output ...
- 1
2
votes
1
answer
117
views
AVR32DA VIH threshold
I am looking into using an AVR32DA48 MCU for a design. The MCU will be powered at 5V and needs to interface with an IC at 3.3V. The IC is 5V tolerant and I am trying to figure out if a level ...
- 153
2
votes
4
answers
189
views
Interfacing Delta PLC and Arduino (Logic Signals)
I am trying to connect a Delta PLC (DVP-10SX) to an Arduino UNO. What I'm trying to achieve here is to be able to exchange Logic signals between both the PLC which has a logic level of 0-24V and ...
- 21
-1
votes
2
answers
92
views
Wired AND and OR question, logic levels?
In the "wired AND and OR" gates pictured can anyone explain what the voltage levels will be for each function?
For AND, I see the output is A*B and for OR, A+B. Is this correct? Also, is ...
- 115
1
vote
5
answers
146
views
Why would an intermediate voltage level cause a metastability in a SR-latch
Transistors and logic gates are actually analog in nature they aren't digital they don't turn on or off at certain voltages.
Image source: All About Circuits - Voltage Tolerance of CMOS Gate Inputs
...
- 191
4
votes
2
answers
286
views
What is meant by TTL in this context?
Regarding this driver manual, the analog input has range 0-5 V with 1 MΩ input impedance. But the manual also writes that the analog input is not TTL compatible:
I thought the term "TTL ...
- 1,791
2
votes
3
answers
1k
views
Is P90NF03L 3.3V logic level MOSFET?
So I want to control my 12V (up to 10A) load through a 3.3V logic level MOSFET. I have purchased the P90NF03L MOSFET but I don't trust my datasheet reading skills so could someone please confirm that ...
- 532
4
votes
1
answer
249
views
Understanding the characteristics of a MOSFET as a switch
Edit 4:
Thanks to the feedback in the comments I tested again and realized that the problem I describe below, with the output voltage being too low, happens regardless of whether the external device ...
- 41
2
votes
2
answers
1k
views
Best way to detect high-impedance state
I want to build a logic probe. What is the best solution to detect a high-impedance state?
- 81
3
votes
4
answers
2k
views
Unidirectional level shifter 1.8-5V -> 3.3V
I'm looking for a circuit/IC to shift logic levels between 1.8/3.3/5V and 3.3V.
This is to connect various devices via UART to the ESP8266. As such, I only need unidirectional translation - the ...
- 33
2
votes
1
answer
289
views
Understanding MOSFET Transfer Characteristics
I am trying to build a control board to turn on and off various 12v devices with a 3.3v logic.
In my hunt for the right MOSFET (have use AO3400 for smaller LED), I'm now looking for something that can ...
- 197
2
votes
0
answers
87
views
How to understand this combinational cyclic circuit made of interconnected SR latches?
I'm trying to understand the following circuit, or better said, what must be the approach to analyze other similar ones:
What I'm doing for now is forget about the clock signal and the ...
- 1,259
-1
votes
1
answer
102
views
What can I do to see only the logical values in the MOSFET input?
(Animated GIF of the simulation is here)
This is a simple circuit that makes the MOSFET turn off, as the temperature of the NTC thermistor rises.
As you increase the temperature in the diagram, the ...
- 55
0
votes
1
answer
368
views
Non-monotonic signal crossing VIL and VIH
I'm using a logic buffer SN74LVC2G125 (SN74LVC2G125 datasheet) which is powered by 1.8V and has VIH and VIL of 1.17V and 0.63V, respectively.
If I have an input signal like below, could the buffer's ...
- 49