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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Again, thanks for the information, everyone! A good book for reference is the TTL Cookbook. I always use US sellers only, and found darasheet with free shipping. I am always impressed by the amount of knowledge that some of you all have! 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 know from know on to just grab them from eBay with 74ls74q shipping! Definitely a learning experience. I am fairly new to the hobby, but am really enjoying learning.

The datasheets are useful as far as packaging goes. Look up the data sheets for dxtasheet devices, compare pinouts, compare truth tables, etc. C most often means ceramic but TI uses J; some others used D P most often means plastic but TI uses N Another bit of data sometimes coded in the suffix is the temperature range i.

Motorola – datasheet pdf

You have to be careful when mixing families due to drive capabilities. Is there a reason I can’t sub one of these two for the 74?

Many times you can get a small qty of common chips, shipped, for a buck or two. I have been trying to learn the datasheets on these things.

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. 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 would be nice if there was even a guide somewhere as to what the suffixes on some of these chips mean Should we ignore that they don’t have the same number of pins? It’s old however you can still find them on Amazon. The down side of Digikey is the site can be hard to navigate to find what you want, but once you get used to the parametric search it is actually pretty fast.

Wouldn’t the board just 74ls74z the extra inputs? Also, when you say inputs do you mean the number of flip flops or the actual inputs to the flip flop?

74LS74 Datasheet PDF

I actually did just that today, and ordered some from eBay. The middle two characters denote specific of the family. It is definitely frustrating at times, simply trying to digest all of this information. 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. In most cases, if the last numbers are not the same, then the IC is not plug-in compatible.

74LS74A Datasheet PDF Texas Instruments –

If it’s cheap though a quarter there’s no incentive for it to be faked and usually you should be alright. 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.

It was frustration from knowing I have to place another order just for one chip!!! The suffixes are often manufacturer-specific, so you’d need to consult that manufacturer’s datasheet and hope it’s detailed. I don’t have a background in electronics, so it is all a learning experience. Quite often, at least one of the suffixes refers to the package.


Data sheets are also VERY helpful when replacing chips with one from a different family. Thanks for the reply! I hate to wait another week or two for one chip. This is where datasheets are VERY helpful.

It has a lot of great information. Hopefully, I will be answering the questions one of these days! Thanks for the help, everyone. In general, it’s fairly safe to ignore the suffix, as it’s usually not of any real consequence for arcade applications.

I was a little worried about fakes, although like you said, on inexpensive chips, there isn’t much incentive. I had ordered a bunch of odds and ends from Jameco, so I ordered the chips with that datashfet, but man they kill you with shipping, and then it is slow to boot!

Not all parts are the same.

I learned the hard way on some cheap TTL replacements from Mouser. Same D type Flip Dagasheet, but without the extra features of a I had also previously used Mouser for some stuff, but they have to have the worst search on any site I have ever seen!

Sierra IC Inc

Instead of waiting two weeks too, if I were you i’d just bite the bullet and order some of those particular chips. Also just order from U. Of course, maybe there is, and I am just too dumb to fatasheet it, lol. Okay, I will answer the why first.

Mouser is another good source as well. Lol, crap, I was thinking they had the same number of pins.

I prefer Digikey over Jameco as they have more parts, and the Datashet Mail shipping is usually cheaper provided you don’t order anything to heavy.