Martin McCormick wrote: > Thank you. If it just does or and nor, it may not be >practical for what I need which is to look at several outputs of >a counter and provide a reset when a hard-wired constant is >reached. For that, one needs to know when the counter's inputs >in question are all high. I'd have to invert every single input >to get an and gate. > >Declan Moriarty writes: > > >>It's an 'or' or a 'nor' gate. >> >>Use OR & invert your main output. Connect 8-16 into any input for a 15 input >>gate. To make 16, you'd need an extra 'or' gate. That's how it seems to me. >> For a complete datasheet:
>> >> > http://www-s.ti.com/sc/psheets/schs045a/schs045a.pdf On page 3-139 (bottom of the page) you can find the possible output boolean expressions, on page 3-140 the function truth table. You need 2 IC's, both programmed as NAND gates. The first 8 bits are connected to the first CD4048B. The EXP input of the first CD4048B must be low. The other 8 bits are connected to the second CD4048B. When you connect the output of the first CD4048B to the EXP input of the second CD4048B you will get a 16 input NAND. Regards, Tinco Brouwer. -- Author: Tinco Brouwer INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
