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Papabravo Well-Known Member Oct 10, Here is what I imagine. Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets.

What actually happened is that they were renamed. Look at the datasheet again.

digital logic – TTL tri-state 16×4 RAM chip not working – Electrical Engineering Stack Exchange

You need pullup resistors. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Hero Banned Aug 29, Home Questions Tags Users Unanswered. I’m usually pretty good at spotting such “revivals”, but this one escaped.

A value like 10K on each switch should work well. They were only made in the s. Click here to register now. Note that this is a very old chip. Sign up using Facebook. Articles Top Articles Search resources.


electronic enthusiasts out there!!! internal circuirtry of 74LS189-64-bit RAM

If you’re after some memory pull some cache chips from an old Papabravo Well-Known Member Oct 2, Just look at the date of the OP Datasheets, Manuals or Parts. Yes I know the LEDs are inverted but the chips sense outputs are inverted too. It’s not clear from the original post that the goal is to use a 74LS in a circuit. The wires I had bought were faulty. Thread starter earlbesario Start date Oct 2, Email Required, but never shown. Media New media New comments Search media.

Post as a guest Name. Where are the pullup resistors for your switches? The issue was the equipment I was using. You must log in or register to reply here.

774189 a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at I thought pullup resistors were only necessary for CMOS. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Notice once again that the original poster seldom returns.

The only databook I have that has anything on it dates fromand byit was no longer listed in any of them. In my 40 plus years in the business I don’t think I’ve ever seen that despite using the part on numerous occasions. Of course you need it ASAP.


Forums New posts Search forums. Welcome to our site! Depending 7418 how it was stored over the past 40 years, the chip you have may simply have expired from old age. Or rather, were never consistently named in the first place, and eventually everyone stopped using the 74xxx designations.

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