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Schematics for 7c81

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3 years 4 months ago #274253 by PCW
Replied by PCW on topic Schematics for 7c81
A 74CBT3257 would only handle 4 signals so you would need 4+ 74CBT3257s per port
PNP is a 2N4403
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3 years 4 months ago #274257 by Donno
Replied by Donno on topic Schematics for 7c81
You mean 2+ per port it is octal FET switch and there is 16 i/o

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3 years 4 months ago #274260 by PCW
Replied by PCW on topic Schematics for 7c81
Each "parallel port" connection has 17 signals
A 74CBT3257 only provides a signal path for 4 signals.
so 4+ 74CBT3257s would be needed per port (13 total)
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3 years 4 months ago #274261 by Donno
Replied by Donno on topic Schematics for 7c81
My apology i mean to write 74CBT3245

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3 years 4 months ago #274263 by PCW
Replied by PCW on topic Schematics for 7c81
That's better but a bit awkward because of the 17 bit wide ports

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3 years 4 months ago #274264 by Donno
Replied by Donno on topic Schematics for 7c81
IO0 to 16 = total of 17 per port. What is the function of the TOLA/TOLB and TOLC Pin ?

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