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Welcome to our site! In my 40 plus years in the business I don’t think I’ve ever seen datasheey despite using the part on numerous occasions.
Papabravo Well-Known Member Oct 10, Forums New daatsheet Search forums.
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The issue was the equipment I was using. Or rather, were never consistently named in the first place, and eventually everyone stopped using the 74xxx designations.
Hero Banned Aug 29, What actually happened is that they were renamed.
TTL-series SRAM demonstration
Media New media New comments Search media. I thought pullup resistors were only necessary for CMOS. Note that the value given is positive 40 uAwhich means that the external circuit must source current in order datashete drive the input high — i.
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A value like 10K on each switch should work well. 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.
(PDF) 74189 Datasheet download
Here’s the datasheet and the store page: Note that this is a very old chip. The only databook I have that has anything on it dates fromand byit was no longer listed in any of them. Home Questions Tags Users Unanswered. You need pullup resistors. Potentiometer Questions Started by norbss Yesterday at Email Required, but never shown.
Depending on how it was stored over the past 40 years, the chip you have may simply have expired from old age. Yes I know the LEDs are inverted but the chips sense outputs are inverted too Here’s the datasheet and the store page: