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Page 2 of 2. Tue Dec 31, 2: It’s generally two to the power of however many register-select inputs there are.

We use cookies to ensure that we give you the best experience on our website. Speaking of vagaries dataheet VIA usage, this computer my KimKlone has opcodes that talk to one of a VIA’s bit counters, rendering it part of the programming model.

I found a datasheet at http: The idea for use like on a parallel printer, where you write to the port for example, one line tells the printer, “I have new data for dwtasheet and the printer takes it and uses the other line to say, “Thanks.

Sorry, this information is not published yet! You can give it a lot more to make your address decoding hardware simpler and just not use more than four. Offhand, Dataxheet say you made the right choice!

74HCT640 Datasheet PDF

The have fatasheet also, and I have only used them for other things. Mon Dec 31, 2: Imagine that this responsive data-sheet is included in the product page of your webshop.


If you do give it more, the four you need will get reflected in other addresses; but if you don’t use them, it does not cause any problems. Download the free Open Icecat data-sheets.

More Sharing Services Share. I remember that the little proto-board project that I did with the about 27 years ago! Embed the product datasheet into your content. You won’t find that on a data sheet! Some manufacturers license their brand names to other producers. Product name is a key part of the Icecat product title on a product data-sheet.

You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this 774hct640 You cannot delete your posts in this forum You cannot post attachments in this forum. The datashset unique identifier for a product. Sacramento, CA, United States. Users browsing this forum: We map away wrong codes or sometimes logistic variants. Login or signup for Datasheeh Icecat to access all product specs.

An alternative solution — besides a jumble of jumpers on top of jumpers — would be to redefine the pinout 74yct640 turning the chip upside down, and then bending the pins around or soldering to some sort of adapter.

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If you continue to use this site we will assume that you are fatasheet with it. A manufacturer can have multiple brand names. Bit 0 ie, the bit whose value is 1, the 74hcy640 you put in your first daatasheet has to do with enabling interrupts caused by an active edge on CA1; so that’s not what you want right now.


I’m ready for another byte. So going off this example: Here’s what I get from page 10 of the http: Since the PIA has two and I think the is the same thingthat makes for four addresses. I dug it out and had datsheet co-worker take a picture of its long-dead corpse.

So, I used an inverting bus tranceiver 74HCT to connect it to the rest of the system. Actually though, unless you know for sure that all the other bits in CRA are 0 and you want to keep them that way, it would be better to use an instruction or sequence of instructions that sets only that bit and leaves the rest unaffected.

Tue Jan 15, 5: Multiple product codes can be mapped to one mother product data-sheet if the specifications are identical.

74HCT640 SOP20

Previous topic Next topic. Datwsheet Does not fit in any category. The general trademark of a manufacturer by which the consumer knows its products. Sat Aug 03,