Hello all,
I am studying electronics at college and have been asked to compare the TTL Low Power Schottky (74LS) and CMOS (4000B) logic families.
I have searched the internet for figures to compare but it seems that everywhere I look gives different values for the specifications that I require. Would any of you be able to give me general values for the:

-Logic high and Logic Low Input current and ‘Fan In’

-Logic high and Logic Low Output current and ‘Fan Out’

-Propagation Delay

-Noise Margin

-Logic high and Logic Low input voltage levels

-Logic high and Logic Low output voltage levels

-Upper frequency limit

for each of the TTL Low Power Schottky (74LS) and CMOS (4000B) logic families so that I can then compare them to each other to create my answer.

I understand these values may be slightly different for different logic chips and manufacturers but I am just after a general overview. Component datasheets don't seem to give all the information that I require and they are all rather cryptic about some points as I guess these values are presumed by the fact they are members of these logic families.



Any help would be amazing.

Thanks

 

Here are datasheets for a SN74LS02 quad NOR gate and a CD4001 CMOS quad NOR gate, so you can compare.

 

Hello,

Have a look at the attached PDF's.
They are comparable, but of different ages.

Bertus

 

Welcome to AAC!

I am studying electronics at college and have been asked to compare the TTL Low Power Schottky (74LS) and CMOS (4000B) logic families.

Since this is school work, I'd suggest that you tell us which family you think has an advantage in each of the categories you mentioned. Then we can offer guidance.