kurt_issac Posted September 9, 2006 Report Share Posted September 9, 2006 Hello, can anyone guide me or help me on, how to substitute a 74390 Dual BCD Counter by using two piece of 7490 BCD Counter? Thanx! Quote Link to comment Share on other sites More sharing options...
mvs sarma Posted October 31, 2006 Report Share Posted October 31, 2006 hido you really need to substitute-- why not, if possible original 74390 or 74ls390if need to do.make a small adopter board with berg pins at the botom to suite t4ls390 pin ot and put 2 nos 7490 on topnear to the pins and try hard wire.. -- laborious job--sarma Quote Link to comment Share on other sites More sharing options...
MNA Posted October 31, 2006 Report Share Posted October 31, 2006 connect Output Qd of first to input of second.....and do the other labour as pointed out by sarma Quote Link to comment Share on other sites More sharing options...
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