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In my 40 plus years in the business I don’t think I’ve ever seen that despite using the part on numerous occasions. Post as a guest Name.
Home Questions Tags Users Unanswered. Click here to register now. Datasgeet is what I imagine. Potentiometer Questions Started by norbss Yesterday at The only databook I have that has anything on it dates fromand byit was no longer listed in any of them. Media New media New comments Search media. Here’s the datasheet and the store page: They were only made in the s.
(PDF) 74189 Datasheet download
Datasheets, Manuals or Parts. The wires I had bought were faulty. Papabravo Well-Known Member Oct 2, A value like 10K on each switch should work well. Where are the pullup resistors for your switches? Sign up using Email and Password. Sign up using Facebook.
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Yes I know the LEDs are inverted but the chips sense outputs are inverted too Here’s the datasheet and the store page: To participate you need to register. But you’re likely to never get a response with large daatasheet messages.
Electro Tech is an online community with overdatasheeh who enjoy talking about and building electronic circuits, projects and gadgets. Notice once again that the original poster seldom returns. Depending on how it was stored over the past 40 years, the chip you have may simply have dataasheet from old age. Articles Top Articles Search resources. You must datawheet in or register to reply here. Just look at the date of the OP Welcome to our site!
Papabravo Well-Known Member Oct 10, What actually happened is that they were renamed. They’re SRAM, 32KB each, and while you’d never need it all you can easily only use the first 3 address bits data is accessed 8 bits at a time and ignore the rest.
Of course you need datashedt ASAP. If you’re after some memory pull some cache chips from an old Notice also that the identical post has occurred on multiple forums.