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TTL Vs CMOS Logic

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ghauri

New Member
Hi All,

Is this possible that a TTL logic IC is coupled with a CMOS IC letsay we have a decoder of TTL and counter of CMOS both are in same circuit plz tell
 

dknguyen

Well-Known Member
Most Helpful Member
POssible

It's possible to have them connected and work just fine, but not necessarily. You would have to dig into the input/output high/low voltage threshold requirements of both chips to make sure you could connect both directly.

Here is a GENERAL chart. Sometimes the hardest thing is figuring out which family the IC actually falls into (there are a few other families too not on the chart). Google for more charts if you need to. Search for things like "CMOS TTL voltage threshold" or "logic translation levels"

https://www.interfacebus.com/voltage_threshold.html

Devices exist that:
-use CMOS but are designed to work with TTL
-use TTL but are designed to work with CMOS
-CMOS and only designed to work with CMOS
-TTL but only designed to work with TTL

It's all mixed up.
 
Last edited:

ericgibbs

Well-Known Member
Most Helpful Member
Cmos is better when compared with Speed and Power Consumption.
But the maximum output Current is Low in CMOS( in mA).
So i have a question, whether they can be used to run a relay.

hi RV,
This thread is 4 years old...
 
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