All Questions
21 questions
-4
votes
3
answers
113
views
How to buffer tri-state GPIO pin for higher source/sink current?
Edit: I am not looking for a circuit to drive LEDs. I am looking for a generic solution to buffer a tri-state GPIO. My mention below of the bi-color LEDs is only to explain why I need to maintain tri-...
- 13
8
votes
5
answers
1k
views
What is the difference between a tristate buffer and a transmission gate?
Functionally, these two "blocks" seem to do the same thing: send input to output if enabled and present high impedance Z on the output if not. However, this answer seems to suggest a ...
- 1,219
0
votes
1
answer
57
views
Looking for a Quad 3−State Noninverting Buffers in DIP package [closed]
My application is a half-duplex serial communication (2 buffers) and a switch for a 35 to 60mA load (1 buffer). I found On Semi MC74HC126AN (https://rocelec.widen.net/view/pdf/h52tembhav/ONSMS12940-1....
- 502
1
vote
2
answers
78
views
can connecting a tristate buffer output to 0 or 1 make problem?
in this circuit the control line is connected to GND so the output is Z. is there any problem to connect the output line to 1 or 0?
if the control line turns to 1, what happen to the circuit?
what is ...
-2
votes
1
answer
143
views
Is tristate buffer power consumption high?
I have 2 questions about tristate buffer.
Is there any problem with using many tristate buffers in circuit design? is tristate buffer power consumption very high?
Is it a good solution to replace a ...
1
vote
1
answer
273
views
Do UART pins on the Beagle Bone Black require tri-state buffers?
The project I am working on uses a Beagle Bone Black (BBB) rev C, we are powering it externally through a cape according to the System Reference Manual's instructions.
The System Reference Manual ...
- 113
3
votes
3
answers
2k
views
Converting 3.3V signal to 5V with tri-state
I need to buffer and tri-state a 3.3V 8 bit signal, and shift the output to 5V (when the buffer is not in tri-state).
I am using a CD54HC373 buffer and 2 BOB-12009 logic level converters, but I can't ...
- 33
0
votes
2
answers
5k
views
How to implement 8x1 multiplexer using 3x8 decoder and 3-state buffer
Suppose that AB and CD are 2-bit unsigned binary numbers
(a) Find the truth table for the function F with 4 inputs A, B, C, D to satisfy the following condition
if AB >= CD, then F = 1, otherwise F =...
- 1
2
votes
2
answers
397
views
Analog 3-state buffer where the input voltage equals the output voltage and is controlled by a digital control line
I'm looking for a device that can control an analog signal without interference. I need it to be controlled by a digital control line (0v - 5v). The input voltage (0v - 5v) should equal the output ...
- 197
-1
votes
1
answer
456
views
Comparison between the performance parameters of Tristate buffer and Schmitt Trigger
I want to know the comparison between the performance parameters of Tristate buffer and Schmitt Trigger. By performance parameters, I mean things like propagation delay,power consumption etc.
Thank ...
- 21
3
votes
1
answer
3k
views
3-state buffer mechanism
I read about the 3-state buffer. I do not precisely understand the working mechanism. It allows essentially to obtain a third state, that corresponding to the disconnection of the output from the ...
- 145
2
votes
2
answers
3k
views
Understanding how a tristate buffer works (74LS241)
I'm trying to understand how the 74LS241 works. From what I read, if two input are high on a buffer, then the output will be high. For some reason, this isn't working on my circuit.
So here is ...
- 263
5
votes
1
answer
652
views
Simple way to invert a tristate output
I am looking for a simple circuit to invert a tristate output from a microcontroller, hopefully using only BJTs. What I mean by this is that the truth table would look like:
...
3
votes
2
answers
11k
views
How do I implement a tri-state buffer for a vector in VHDL?
I want to implement a tri-state buffer for a input vector, triggered by an enable vector, where every bit of the enable vector enables the corresponding bit of the input vector.
Something like this ...
- 33
0
votes
1
answer
490
views
Interfacing 6116 RAM to a data bus
I have a question about interfacing IDT6116SA15TPG SRAM to a tri-state data bus controlled by 74LS244 tri-state buffer. I could not find an old memory like 74LS289 with separated inputs and outputs.
...
- 1
0
votes
3
answers
237
views
Bi-directional logic level conversion
I'm trying to design an accelerated CPU (65816) for the Apple IIGS by using a high speed ARM processor combined with a software emulator + software emulated cache. The CPU I'm using is the LPC4300 ...
- 4,228
3
votes
2
answers
894
views
Interfacing tri-state logic across 3v3/5v. Do buffers mirror all three logic states?
(This is just learning/hobby stuff...)
I have a 5v (tri-state TTL, ZX Spectrum) bus and I want to interface some non-5v tolerant 3v3 chips to it.
I think I need buffers or transceivers for the level ...
- 1,002
1
vote
1
answer
281
views
In a tristate buffer which transition time should be larger
I was having a doubt related to tristate buffers. I know that a tristate buffer allows an output port to assume a high impedance state in addition to the 0 and 1 logic levels, effectively removing the ...
0
votes
4
answers
6k
views
Making a bi-directional tri-state buffer using two normal tri-state buffers, is it possible?
I need to use a tri-state buffer on a I2C bus and I have lots of 74125 (uni-directional tri-state buffers), so I'm wondering if is possible to connect two buffers back-to-back to make a bi-directional ...
- 180
2
votes
4
answers
4k
views
Open Collector Tristate Buffer
I'm looking for an IC with the following functional diagram. Basically it's an inverting buffer whose output is open-collector, and that has an enable signal. An equivalent logical circuit would be to ...
- 22.9k
3
votes
2
answers
4k
views
Recommendations for analog tri-state buffer?
I'm currently working on a project that requires interfacing to a clock and data line at a configurable voltage between 0V-5V with nonstandard logic levels, this voltage is generated elsewhere. To be ...
- 2,527