Hi Peter

TTL means Transistor Transistor Logic and is IC operating on a 5V supply
only !
CMOS is Complementary Metal Oxide Semiconductor and can operate from some
what ?3V? to over 12V normally ... they can also replace TTL as their name
Complementary suggests :)

The TTL IC's can always be distinguisted by their number .. for instance

74LS00 , 74HC01 .. everytime you see 74 youre dealing with a TTL logic IC

and CMOS is 40xxx forinstance  4000, 4001, 4049

Hope it helped else dont hesitate to write back ... sorry for my bad english
but i hope that you will manage to understand some phrases of it :)

Best Regards
Lasse Madsen
----- Original Message -----
From: "Peter Foster" <foster@INET.CO.TH>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, November 13, 2001 12:53 AM
Subject: [EE]:TTL & CMOS?


> As relatively new to electronics, I keep seeing these terms: TTL & CMOS -
> what do they mean???
>
> Thanks
>
> Peter
>
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