Oct 18, 74LS Datasheet – Bit Random Access Memory – TI, 74LS pdf, 74LS pinout, 74LS manual, 74LS schematic, 74LS Request ETC 74LS BIT RANDOM ACCESS MEMORY(With 3-State Outputs) online from Elcodis, view and download 74LS pdf datasheet, Logic. ; Manufacturer: Major Brands; Manufacturer no.: National Semiconductor [ KB ]; Data Sheet (current) [ KB ]; Representative Datasheet, MFG.

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Here’s comment from Ben’s page you refer to in your question: The issue was the equipment I was using. I cheched Jameco but they do not ship to Finland.

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

Sign up using Facebook. First, I’m using the 74LSAN as a bit random access memory, and I will use two of them to make a total of 16 bytes in my machine. Datasheeg as a guest Name. Hero Banned Aug 29, Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets.

Sign up using Facebook. Click here to register now. I’m usually pretty good at spotting such “revivals”, but this one escaped. Second, put some pull-up resistors on the 74LS04 inputs. I too decided to order more expensive ‘s in the end from a UK seller the batch that didn’t work were a cheap Chinse import Look at the datasheet again.

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integrated circuit – 74LS chip overheat – Electrical Engineering Stack Exchange

Depending on how it was stored over the past 40 years, the chip you have may simply have expired from old age. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Email Required, but never shown. Note that the value given is positive 40 uAwhich means that the external circuit must source current in order to drive the input high — i. Sign up or log in Sign up using 74ld189. Just look at the date of the OP I have hooked up one of the chips with the required datashert power supply and had the address data pins connected to ground along with the four digital inputs.

So from your answer I will try to get a few of the chips from jameco since the ones I have are probably defective. Per your circuit description chip should not heat – there’s no over-current drain, and no electrical conflicts at its outputs.

74LS Datasheet PDF –

I got mine from a ebay seller. When you switch from write to read, the 74LS outputs switch to high impedance, so your 74LS04 inputs are floating. Anyone here have any other site where these can be ordered to Finland? Notice once again that the original poster seldom returns.

Here’s comment from Ben’s page you refer to in your question:. Daniel 1, 2 9 Media New media New comments Search media. Number one would be to post a schematic. Welcome to our site!


I thought pullup resistors were only necessary for CMOS. If you search over internet using query “74LSAN heating”, there’s a video by Ben Eater exactly on the subject, with people comments expand the replies on that page to see them:. The wires I had bought were faulty.

Home Questions Tags Users Unanswered. Where datasheeh the pullup resistors for your switches? By continuing to use this site, you are consenting to our use of cookies. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

The chips did not work and heated up very quickly, I followed the RAM videos multiple times and consulted the datasheet to ensure I wired the chip correctly.

Papabravo Well-Known Member Oct 2, Email Required, but never shown. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Papabravo Well-Known Member Oct 10, I have started work on a new project of mine of building a simple 8-bit computer.