74hct4020 question

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Thanks so much but I think I will leave this part for another day. It will really be overkill for what I need right now and at the moment I think I have all the info needed and a working circuit.

Thanks to all the others for kicking in also.
 
JonSea said:
Just FYI. The ULN2003 is an awesome, cheap driver chip (and very common). But it's ok 7/8s as awesome as the ULN2803. The same part with an addition channel. For some reason, it doesn't seem as well known.
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Back in the day, the 18 pin package made it noticeably more expensive (relative to a 16-pin part) to produce as a component, purchase, design into a product, and manufacture. For example, an 18 pin DIP socket was much more than 1.125 times a 16 pin socket, and socketing this driver was very common.

ak
 
Old logic types? Did anyone ever worked with DTL or HTL devices?

I once had to repair an industrial control employing HTL chips.
 
Maybe Jack does not understand that a 7490 is a decrepit old TTL with high input currents. But a 74HCT4020 is not TTL, instead it us high speed Cmos with TTL threshold voltages.
 
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