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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74ls74a datasheet & applicatoin notes – Datasheet Archive

It would be nice if there was datsaheet a guide somewhere as to what the suffixes on some of these chips mean I was a little worried about fakes, although like you said, on inexpensive chips, there isn’t much incentive. I learned the hard way on some cheap TTL replacements from Mouser.

The middle two characters denote specific of the family. Again, thanks for the information, everyone! Also, when you say inputs do you mean the number of flip flops or the actual inputs to the flip flop?

I had also previously used Mouser for some stuff, but they have to have the worst search on any site I have ever seen! It’s old however you can still find them on Amazon. I know from know on to datahseet grab them from eBay with free shipping! Not all parts are datashedt same.

Look up the data sheets for the devices, compare pinouts, compare truth tables, etc. Also just order from U. Wouldn’t the board just ignore the extra inputs? The datasheets are useful as far as packaging goes. Okay, I will answer the why first.


74LS74 Datasheet

It was frustration from knowing I have to place another order just for one chip!!! 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. If it’s cheap though a quarter there’s no incentive for it to be vatasheet and usually you should be alright.

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.

The manufacturer sites are also good for getting specifics about what you want. Mouser is another good source as well. Quite often, at least one of the suffixes refers to the package. Hopefully, I will be answering the questions one of these days! You have to be careful when mixing families due to drive capabilities. It has a lot of great information.

Is there a reason I can’t sub one of these two for the 74? Many times you can get datashret small qty of common chips, shipped, for a buck or two. 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. 74lls74a

Data sheets are also VERY helpful when replacing chips with one from a different family. Of course, maybe there is, and I am just too dumb to find it, lol.

Lol, crap, I was thinking they had the same number of pins. In general, it’s fairly safe to ignore the suffix, as it’s usually not of dafasheet real consequence for arcade applications.


I have been trying to learn the datasheets on these things. I am fairly new dattasheet the hobby, but am really enjoying learning. 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. This is where datasheets are VERY helpful.

You don’t really need to worry much about fakes for daatasheet standard TTL families, in my opinion. 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. Thanks for the reply! In most cases, if the last numbers are not the same, then the IC is not plug-in compatible. A good book for reference is the TTL Cookbook. 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.

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 774ls74a temperature range i.

(PDF) 74LS74A Datasheet download

Definitely a learning experience. Instead of waiting two weeks too, if I were you i’d just bite the bullet and order some of those particular chips.

I always use US sellers only, and found one with free shipping.