That is really weird. Please understand I am not questioning what you are saying, but perhaps there is another explanation. The 74LS596 (I have never seen an HC version) is indeed an open collector chip similar to the 74HC595, which is a tri-state device. On the 74HC595 the inv G (pin 13) should be held low for normal operation. If it goes high for any reason, the output will float in tri-state mode, similar to what an open collector would look like. As you say, I can’t for the life of me not figure why anyone would bother to rebadge those chips especially since there does not seem to be an economic one (which is usually the motivation).
Bill From: [email protected] [mailto:[email protected]] On Behalf Of David Pye Sent: Friday, January 25, 2019 4:12 PM To: [email protected] Subject: Re: [neonixie-l] Re: Counterfeit RTC modules It seems even things barely worth faking are being faked also. I have a bag of 500 74HC595 shift registers, that are actually rebadged 74HC596s (as in, open collector, SINK, not SOURCE-capable). Which are useless for my application :-( -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/008501d4b4fc%24bb636a80%24322a3f80%24%40gmail.com. For more options, visit https://groups.google.com/d/optout.
