Hello!
I am a Ph.D. student in particle physics and for our experiment we need to convert a 5V TTL digital signal (16-bits actually) coming out of a Phillips 726 converter and read it using the GPIO pins of a Raspberry Pi 4. We do not need bidirectional communication. We just need to read this 16-bits number that comes in the form of 16 parallel TTL signals. The number changes every 2.5 seconds or so, so high speed is not really an issue here.
We are going to order all the parts and chips from the Adafruit website. I think we have basically three options:
I am leaning towards the 74LVC245 Chip, do you think it is the best choice too? If not why?
The output of the Phillips 726 has the following specs:
TTL Output One TTL output per channel, LEMO style connector; sources 45 mA to drive 50 ohm load or 1000 standard TTL loads, sink current of 100 mA; able to drive 100 standard TTL loads. 3.5 nsec rise and fall times.
Thank you
Giorgio
EDIT:
The circuit of post #5 turned out to be just fine for my requirements.
I am a Ph.D. student in particle physics and for our experiment we need to convert a 5V TTL digital signal (16-bits actually) coming out of a Phillips 726 converter and read it using the GPIO pins of a Raspberry Pi 4. We do not need bidirectional communication. We just need to read this 16-bits number that comes in the form of 16 parallel TTL signals. The number changes every 2.5 seconds or so, so high speed is not really an issue here.
We are going to order all the parts and chips from the Adafruit website. I think we have basically three options:
I am leaning towards the 74LVC245 Chip, do you think it is the best choice too? If not why?
The output of the Phillips 726 has the following specs:
TTL Output One TTL output per channel, LEMO style connector; sources 45 mA to drive 50 ohm load or 1000 standard TTL loads, sink current of 100 mA; able to drive 100 standard TTL loads. 3.5 nsec rise and fall times.
Thank you
Giorgio
EDIT:
The circuit of post #5 turned out to be just fine for my requirements.
Last edited: