Sal Brisindi said:
Tim,
Good luck finding them, I've been looking for the MM5311's for a while. You
can still get the MM5314's but you will need the 74C915 7 Segment to BCD
converter chip. Plus you will meed a 7441/74141 with either chip anyway. I
built my 1st 6 digit nixie clock with 17 TTL ic's earlier this year. You
can see the photos at
http://www.tuberadios.com
You can purchase a preprogrammed PIC ic's that will need 2 7441's. If you
want more info, let me know. I have been on this nixie tube quest for a
while.
Actually, other members of the MM53xx have BCD output (multiplexed), so you
don't need the converter. But if you want to de-multiplex and direct drive
your nixies, you'll need to latch the BCD data. This isn't actually necessary
though, as the multiplex drive can be used as-is with the only penalty being
lower maximum apparent brightness of the nixies (usually not a problem
indoors).
IC's similar to the MM5314 include MM5309, MM5311, MM5312, MM5313, and MM5315.
All of these except the MM5314 have BCD output. Each has a slightly different
feature set: MM5309 has Reset, MM5311 has Hold, MM5312 has 1pps output but
only 4-digit display, MM5313 has 1pps out and Hold, MM5314 has 7-segment
output only with Output Enable (display blanking) and Hold, MM5315 has Hold
and Reset.
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Alan "A.J." Franzman
Email: a.j.franzman at verizon dot net
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