blw@acsu.buffalo.edu (brian l wybaillie) (12/12/90)
hello,
i am building a circuit which requires a high speed BCD counter with
clear. it must be able to handle frequencies up to 40 MHz. the one that
comes to mind is the 74s196 which according to a TTL data book can handle
up to 100 MHz at clock 1 and 50 MHz at clock 2. fine, but here's the catch,
it must be CMOS. oh no...
as much as i have tried i can't seem to locate a cd74hc196, my question
is, does anyone know if this even exists? and if not, is there a chip out
there which is comparable. i have very limited access to data books so any
responses are very much appreciated.
while i'm on the topic of appreciation, thanks to the many responses
i received on my last posting,(schmitt trig. configurations).
thanks again,
brian wybaillie
internet: blw@.acsu.buffalo.edu
bitnet: v091j47x@ubvms.cc.buffalo.edupaul@research.canon.oz.au (Paul Higginbottom) (12/14/90)
In article <50717@eerie.acsu.Buffalo.EDU> blw@acsu.buffalo.edu (brian l wybaillie) writes: >hello, > i am building a circuit which requires a high speed BCD counter with >clear. it must be able to handle frequencies up to 40 MHz. the one that >comes to mind is the 74s196 which according to a TTL data book can handle >up to 100 MHz at clock 1 and 50 MHz at clock 2. fine, but here's the catch, >it must be CMOS. oh no... > as much as i have tried i can't seem to locate a cd74hc196, my question >is, does anyone know if this even exists? and if not, is there a chip out >there which is comparable. i have very limited access to data books so any >responses are very much appreciated. If you don't need a reset function, you could try a 74AC190 from for example National. The 74AC192 has asynchronous reset and separate count up and count down clock inputs. Both devices have asynchronous parallel loading and synchronous counting. Both devices can operate at up to 120 MHz. Regards, Paul -- Paul Higginbottom | paul@research.canon.oz.au Canon Information Systems Research Australia | Phone +61-2-805-2910 PO Box 313 NORTH RYDE NSW 2113 | Fax +61-2-805-2929