Cmos driving TTL through a diode

MrAl said:

Some apps do not become affected by an inverted clock, especially when the clock pulse is narrow. If you read back in my post you'll see i mentioned that he would have to check that effect out to make sure an inverter doesnt bother the timing enough to cause a problem.
If one transistor does not work then two will anyway.

I do like the idea of an 'or' gate too though, or a 'nor' gate with a second section used as an inverter.

If for some reason a diode does have to be used, then i would recommend working with a Schottky diode with a lower forward voltage drop.

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MrAl said:

Hi Roff,

I just wanted to stay bipolar there (little pun) but i also did not want to assume an inverted clock would work because i do not know what he is using those two counters for and how wide the clock pulse is. I do like the idea of a 'nor' gate, or if need be a 'nor' gate with an extra section of the chip used as an inverter, whichever works best for his app.

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