Posted on: March 22, 2020 Posted by: admin Comments: 0


The SN54 / 74LS74A dual edge-triggered flip-flop utilizes Schottky TTL cir- cuitry to produce high speed D-type flip-flops. Each flip-flop has individual clear and. This device contains two independent positive-edge-trig- gered D flip-flops with complementary outputs. The infor- mation on the D input is accepted by the. 74LS74A datasheet, 74LS74A circuit, 74LS74A data sheet: TI – DUAL D-TYPE POSITIVE-EDGE-TRIGGERED FLIP-FLOPS WITH PRESET AND CLEAR.

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I know from know on to just dayasheet them from eBay with free shipping! Not all parts are the same. When you start getting into TTL PROMs and older 8 bit CPUs, which are usually pretty expensive and have been discontinued for a fairly long time, then you need to verify what you are getting.

I prefer Digikey over Jameco as they have more parts, and the Priority Mail shipping is usually cheaper provided you don’t order anything to heavy. Hopefully, I will be answering the questions one dztasheet these days! Thanks for the help, everyone.


74lz74a Lol, crap, I was thinking they had the same number of pins. Mouser is another good source as well. The suffixes are often manufacturer-specific, so you’d need to consult that manufacturer’s datasheet and hope it’s detailed. I had ordered a bunch of odds and ends from Jameco, so I ordered the chips with that stuff, but man they kill you with shipping, and then it is slow to boot! If it’s cheap though a quarter there’s no incentive dwtasheet it to be faked and usually you should be alright.

PDF 74LS74 Datasheet ( Hoja de datos )

It was frustration from knowing I have to place another order just for one chip!!! I know that the 74 is a dual d-type flip flop, while the is a hex d-type flip flop with clear, and the is a quad d-type flip flop with clear. I was a little worried about fakes, although like you said, on inexpensive chips, there isn’t much incentive. I am always impressed by the amount of knowledge that some of you all have!


It would be nice if there was even a guide somewhere as to what the suffixes on some of these chips mean In most cases, if the last numbers are not the same, then the IC is not 74ls74w compatible. Data sheets are also VERY helpful when replacing chips with one from a different family. Same D type Flip Flops, but without the extra features of a Should we ignore that they don’t have the same number of pins?

A good 744ls74a for reference is the TTL Cookbook. Again, thanks for the information, everyone! Thanks for the reply!

Wouldn’t the board just ignore the extra inputs? Is there a reason I can’t sub one of these two for the 74? Also just order from U. I don’t have a background in electronics, so it is all a learning experience. It has a lot of great information.

I always use US sellers only, and found one with free shipping. I have been trying to learn the datasheets on these things. It’s old however you can still find them on Amazon. Instead of waiting two weeks too, if I were you i’d just bite the bullet and order some of those particular chips.

I hate to wait another week or two for one chip. In general, it’s fairly safe to ignore the suffix, as it’s usually not of any real consequence for arcade applications. You don’t really need to worry much about fakes for the standard TTL families, in my opinion. The manufacturer sites are also good for getting specifics about what you want.



It is definitely frustrating at times, simply trying to digest all datashee this information. Okay, I will answer the why first. I learned the hard way on some cheap TTL replacements from Mouser. I actually did just that today, and ordered some from eBay. I am fairly new to the hobby, but am really enjoying learning. Quite often, at least one of the suffixes refers to the package. You have to be careful because the suffix denotes packaging and you don’t want to get a SIP or surface found when you want DIP.

I had also previously used Mouser for datashdet stuff, but they have to have the worst search on any site I have ever seen!

Of course, maybe there is, and I am just too dumb to find it, lol. You have to be careful when mixing families due to drive capabilities. This is where datasheets are VERY helpful.

Sierra IC Inc

Also, when you say inputs do you mean the number of flip flops or the actual inputs to the flip flop? The datasheets are useful as far as packaging goes. Definitely a learning experience. If it had a standardyou may not be able to replace it with a 74LS74 depending on how many connections there are to the output.


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