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Note that this is a very old chip. You must log in or register to reply here. But you’re likely to never get a response with large bold messages.
(PDF) 74189 Datasheet download
Note that the value given is positive 40 uAwhich means that the external circuit must source current in order daatasheet drive the input high — i. Here’s the datasheet and the store page: Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Depending on how it was stored over the past 40 years, the chip you have may simply datasheeet expired from old age. It’s not clear from the original post that the goal is to use a 74LS in a circuit.
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TTL-series SRAM demonstration
Papabravo Well-Known Member Oct 2, They were only made in the s. Replacement Transformer Started by ncag Today at 7: Or rather, were never consistently named in the first place, and eventually everyone stopped using the 74xxx designations.
Click here to register now. Here is what I imagine. Yes I know the LEDs are inverted but the chips sense outputs are inverted too Here’s the 74819 and the store page: Datasheets, Manuals or Parts. 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.
Media New media New comments Search media. If you’re after some memory pull some cache chips from an old I’m usually pretty good at spotting such “revivals”, but this one escaped.
Notice once again that the original poster seldom returns. A value like 10K on each switch should work well. I thought pullup resistors were only necessary for CMOS. Yes I know the LEDs are inverted but the chips dataasheet outputs are inverted too.
Hero Banned Aug 29, The only databook Dataseet have that has anything on it dates fromand byit was no longer listed in any of them.