28 Oct
2010
28 Oct
'10
3:55 p.m.
On 2010 Oct 28, at 2:14 PM, Chuck Guzis wrote:
On 28 Oct 2010 at 20:07, Tony Duell wrote:
OK, I claim three solutions:
a) - 7 packages (all 14/16-pin)
- 6.666 utilisation
- (and 7 pull-up resistors, to be pedantic)
- regular TTL active-high outputs
b) - 8 packages (all 14/16-pin)
- 6.9 utilisation
- high-drive active-low outputs for direct-drive of LEDs
c) - 7 packages (1 20-pin, 6 14/16-pin)
- 6.75 utilisation
- high-drive active-low outputs for direct-drive of LEDs
Is there a prize if I win?
If you ingnroe 'progammable' devices
(PROMs, PALs, FPGAs, etc), what's
the simplest solution for getting 0-9,A-F from 4 bits of binary using
only 74xxx devices (and preferably common ones). I can trivially do it
in 7 such chips, but alas they're all 24 pin devices. Anything
simpler?
Interesting challenge, Tony. I'll work on it before bed tonight if
no one else does. It should put me right to sleep...