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I’m usually pretty good at spotting such “revivals”, but this one 74198. Are these guys all members of the same class, or worse, team in a class?
(PDF) 74189 Datasheet download
A value like dqtasheet on each switch should work well. Yes I know the LEDs are inverted but the chips sense outputs are inverted too. You need pullup resistors. Dataxheet you’re likely to never get a response with large bold messages. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.
74189 Datasheet
They were only made in the s. Or rather, were never consistently named in the first place, and eventually everyone stopped using the 74xxx designations. For a better experience, please enable JavaScript in your browser before proceeding. Look at the datasheet again.
Note that this is a very old chip. Just look at the date of the OP The issue was the equipment I was using.
The only databook I have that has anything on it dates fromand byit was no longer listed in any of them. What actually happened is that they were renamed. The wires I had bought were faulty.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Here’s the datasheet and the store page: Notice once again that the original poster seldom returns. I thought pullup resistors were only necessary for CMOS. Sign ratasheet using Facebook. Sign up or log in Sign up using Google. Where are the pullup resistors for your switches?
Yes I know the LEDs are inverted but the chips sense outputs are inverted too Here’s the datasheet and the store page: It’s not clear from the original post that the goal is to use a 74LS in a circuit. Forums New posts Search forums. By using our site, you acknowledge that you have read and dafasheet our Cookie PolicyPrivacy Policyand our Terms of Service.
digital logic – TTL tri-state 16×4 RAM chip not working – Electrical Engineering Stack Exchange
Post as a guest Name. Depending on how it was stored over the past 40 years, the chip you have may simply have expired from old age. Articles Top Articles Search resources.

Replacement Transformer Started by ncag Today at 7: If you’re after some memory pull some cache chips from an old In my 40 plus years in the business I don’t think I’ve ever seen that despite using the part on numerous occasions.
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