Hi,
a bit unclear.
In headline you talk about "emulating TTL":
--> TTL = transistor-transistor-logic ... which more or less describes the ouput (and input) stage of a logic device.
in text you talk about "replacing octal buffers":
--> do you mean the SN74F573N ICs?
If so,
* why don´t you simply write you "want to replace SN74F573N with an MCU" and avoid guessing?
* SN57F537N is a "octal latch", not a simple buffer. And they have no schmitt-trigger inputs..
--> do you mean the SN74F244 ICs?
If so,
* why don´t you simply write you "want to replace SN74F244 with an MCU" and avoid guessing?
* But they have no schmitt-trigger inputs..
****
You write you want to replace it with an MCU. Which MCU? There are so many... with different specifications, some may suite some may not.
Do you want a "pin-to-pin" replacement? Or what is your idea?
You say "the speed of the MCU should be enough". How do you know? Where are the timing requirements? A 74F244 has a delay of about 4ns from input to output. I´d say about impossible to achive with software....
many MCUs may have trouble with 1000 times slower (= 4us)
Maybe you should give more (and clear) details...
Klaus
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Hi,
They may be able to be replaced by slower types ... eg. LS series.
I assume they know why they used the fast ones.... instead of cheap, low power, good available, but slower LS family logic ICs.
Yes this is kind of weird, but I am thinking this as a way to reduce the number of chips even more.
A single PLD could replace all the logic ICs easily.....an FPGA even could include the whole 8088 ...
Klaus