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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Data sheets are also VERY helpful when replacing chips with one from a dataaheet family. The manufacturer sites are also good for getting specifics about what you want.

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!

74ls74a datasheet & applicatoin notes – Datasheet Archive

A good book for reference is the TTL Cookbook. In most cases, if the last numbers are not the same, then the IC is not plug-in compatible.

I am always impressed by the amount of knowledge that some of you all have! Thanks for the reply! Of course, maybe there is, and I am just too dumb to find it, lol. I always use US sellers only, and found one with free shipping. Same D type Flip Flops, but without the extra features of a Thanks for the help, everyone. It has a lot of great information.

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Is there a reason Datashete can’t sub one of these two for the 74? 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 was a little worried about fakes, although like you said, on inexpensive chips, there isn’t much incentive.


You don’t really need to eatasheet much about fakes for the standard TTL families, in my opinion. I know from know on to just grab them from eBay with free shipping! I had also previously used Mouser for some stuff, but they have to have the worst search on any site I have ever seen! 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. 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.

I actually did just that today, and ordered some from eBay. Quite often, at least one of the suffixes refers to the package. I am fairly new to the hobby, but am really enjoying learning. Hopefully, I will be answering the questions one of these days!

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. Again, thanks for the dataseet, everyone! Not all parts are the same. You have to be careful when mixing families due to drive capabilities. Definitely a learning experience. Should we ignore that they don’t have the same number of pins? Mouser is another good source as well.

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

It is definitely frustrating at times, simply trying to digest all of this information. Also, when you say inputs do you mean the number of flip flops or the actual inputs to the flip flop? I don’t have a background in electronics, so it is all a 74la74a experience.

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Look up the data sheets for the 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.

This is where datasheets are VERY helpful. The datasheets are useful as far as packaging goes. If it’s cheap though a quarter there’s no incentive for it to be faked and usually you should be alright.

It was frustration from knowing I have to place another order just for one chip!!! Okay, I will answer the why first. The suffixes are often manufacturer-specific, so you’d need to consult that manufacturer’s datasheet and hope it’s detailed.

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. The middle two characters denote specific of the family. Many times you can get a small qty of common chips, shipped, for a buck or two.

I hate to wait another week or two for one chip. Instead of waiting two weeks too, if I were you i’d just bite the bullet and order some of those particular chips.