19 Dec
2006
19 Dec
'06
6:28 p.m.
On 19 Dec 2006 at 16:54, Jeff Walther wrote:
Is there a guide somewhere to the different families
of logic, such
as RTL, TTL, LSTTL (never heard of that one) and CMOS? I was
choosing some simple logic components for my IIfx SIMM project the
other day and was somewhat bewildered by the choice of input/output
levels. Also, some are Schmidt Triggered?
SIgh. Googling around, I find not a lot of detail on the logic
families, or that they've now become the exclusive domain of
engineering textbook writers and EE professors.
If you can get your hands on one, the big old Motorola Integrated
Circuit data book from about 1969 is an excellent reference on RTL,
ECL, DTL, HTL, TTL and even some MOS (not CMOS). While a few things
have been added (like CMOS logic), the basic principles of operation
haven't changed much.
The very interesting thing about RTL was that the ICs could be
operated in the linear region for lots of non-logic applications.
Cheers,
Chuck