ok this will be quick .
what is an sn 7490
and explain what it does.
the very first correct answer gets my vote so go for it.
2007-08-20 12:02:04 · 5 answers · asked by emc.squared 1 in Science & Mathematics ➔ Engineering
oh by the way explain what it does and what was it used in.
2007-08-20 12:03:23 · update #1
well done tlbs
2007-08-20 12:19:46 · update #2
I use these chips all the time as I design and build digital clocks.
2007-08-20 12:21:51 · update #3
It's a decade ripple counter, consisting of a divide-by-2 and a divide-by-5 section.
You feed it clock pulses and it counts from 0 ... 9 (as in binary coded decimal) in a 4-bit register.
There is also a reset funciton.
They were used in BCD counters before those functions became integrated into larger VLSI circuits (such as the ICL7107 and the like). Used in conjuction with a BCD-to-7 segment converter IC, you can make a counter that drives 7-segment LED displays.
I was using them way back in the early 1970s.
.
2007-08-20 12:15:01 · answer #1 · answered by tlbs101 7 · 0⤊ 0⤋
It is a semi-conducter decmial counter which forms part of an integrated circuit. (Its a microchip basically) Larger (asynchronous) decimal counters can be built by using cascades of several 7490 chips.
The 7490 is part of the 7000 series of logic chips made originally by Texas instruments as part of their TTL technology. It is whats called a decade counter. That is it divides in two parts by 2 and 5 seperately.
2007-08-20 19:22:14 · answer #2 · answered by UKGardener2007 3 · 0⤊ 0⤋
It is a decade counter IC. It has two sections : count to 5, and count to 2. So, you can wired it up to count to 2, 5, or 10 ( with both counters together ).
2007-08-20 20:38:08 · answer #3 · answered by ngcolin 2 · 0⤊ 0⤋
good question, let me know to will you?
2007-08-20 19:10:05 · answer #4 · answered by brommas 4 · 0⤊ 1⤋
http://www.chem.duke.edu/~boris/datasheets/SN7490-93.pdf
Hopefully that should help
2007-08-20 19:09:20 · answer #5 · answered by Dom 1 · 0⤊ 0⤋