21 Apr
1998
21 Apr
'98
8:46 p.m.
From: Tony Duell [mailto:ard@p850ug1.demon.co.uk]
I was once involved with a design when we needed a nasty function of 3
TTL level signals. There wasn't space for a lot of extra gate packages.
I
immediately said that I could do it in one single TTL package. One of
the
other designers (who is very clueful) said 'Oh, I suppose you want a TTL
PROM, or maybe one of those TI PALs with the 74-series numbers'. I said
'No, I can do it with a normal 16 pin TTL chip that doesn't have to go
in
a programmer first'. So, what was the chip ?
74LS138, 1 of 8 decoder, the three inputs go to A, B, C, all 8
possibilities decoded on the outputs.
Jack Peacock