Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: lakeguy2 on January 15, 2010, 03:16:31 AM
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I highly recommend the CMOS IC CD4049UBE, This 16 pin chip is the cats meow. If you want to convvert logic low to logic high, or logic high to logic low, or just want to turn a switch on and off, 1 pulse on.... 1 pulse off.... the pinouts are in line.... intput and output next to each other X6 ^ 6 IO channels. I have also used it to "clean up" signals works great for limit switches, and home made drive circuits to "clean up the signal" I used a 1k resistor to pull the input high/ or low with an input low/ or high. and visa versa. I purchased mine from Newark electronics> Was thinking i might be off base, but , its so simple I thought i'd pass it on??????
P.S hex inverting buffer cd4049 cd4050 I use the 4049 the tech i have is from www.fairchildsemi.com document... DS005971.prf
STEVO....
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For myself, when talking with logic IC'S, I prefer TTL technology.
Most of logic are 5 volts and most of CMOS like 4000 and up, are old technology and are very sensitive to static.
If I have to use buffer or inverter, I prefer going with the 74HC series, unless you need to use higher voltage..
Jeff
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For myself, when talking with logic IC'S, I prefer TTL technology.
Most of logic are 5 volts and most of CMOS like 4000 and up, are old technology and are very sensitive to static.
If I have to use buffer or inverter, I prefer going with the 74HC series, unless you need to use higher voltage..
Jeff
TransistorTransistorLogic was developed long before CMOS technology. The TTL logic chips were very much too slow so they were basically modified into upgraded higher speed devices by utilizing CMOS technology. TTL requires greater current as well so heat was a problem. The original CMOS chips had no static protection. The merger of TTL and CMOS was the best thing to happen to both technologies maintaining pin for pin conversion....
When "JIMPAC" went out of business, I bought the remaining stock from a number of electronics stores so I have a pretty good selection of both TTL and CMOS chips. Yes, they are great fun to work with - both of them!
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STATIC >:( >:( >:( I have been reading a lot of posts, I wonder how many of them are static related. I bet a lot! The 1k resistor On the input to pull up, or pull down works well for me then full 5v or vss for switching, you could go in the ohms range i suppose if you had to pull harder. I use mine wired right before my stepper drive controler. capicitors and resistors placed in strategic spot on the input circuit to SNUFF >:D the dreaded static. (or NOISE) I actually added some capacitors on my driver board, to get rid of some of the noise. I think my new word of the day is going to be THRESHOLD :D I do agree jeff they are sensitive like a fine lady, any little thing may setm off, but that isn't always bad ;) sensitivity can be very good when you need It ;D I had a very rough signal going to my drive controler and It made quite a difference to "clean it up"
I read some of these posts and think of the guy pulling the trailer down the road turning left, and the lights are flashing a secret code dim bright left right The ungrounded light syndrome, electrons on the loose! or the little kid in the grocery store totally out of control.
BOTH NEED TO BE GROUNDED!!!!!!