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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Thanks for the help, everyone. Definitely a learning experience. Lol, crap, I was thinking they had the same number of pins.
74LS74 Datasheet PDF
I am fairly new to the hobby, but am really enjoying learning. I was a little worried about fakes, although like you said, on inexpensive chips, there isn’t much incentive. The middle two characters denote specific of the family. 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 was frustration from knowing I have to place another order just for one chip!!!
74la74a times you can get a small datasheet of common chips, shipped, for a buck or two. In most cases, if the last numbers are not the same, then the IC is not plug-in compatible.
I hate to wait another week or two for one chip. I have been trying to learn the datasheets on these things. 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. Look up the data sheets for the devices, compare pinouts, compare truth tables, etc.
I am always impressed by the dstasheet of knowledge that some of you all have! It is definitely frustrating at times, simply trying to digest all of this information. Again, thanks for the information, 74l74a Quite often, at least one of the suffixes refers to the package. This is where datasheets are VERY helpful. Wouldn’t the board just ignore the extra inputs? 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.
Okay, I will answer the why first. 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. Thanks for the reply! Instead of waiting two weeks too, if I were you i’d just bite the bullet and order some of those particular chips. If it’s cheap though a quarter there’s no incentive for it to be faked and usually you should be alright.
It has a lot of great information. A good book for reference is the TTL Cookbook. 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. Of course, maybe there is, and I am just too dumb to find it, lol.
Not all parts are the same. The suffixes are often manufacturer-specific, so you’d need to consult that manufacturer’s datasheet and hope it’s detailed.
74LS74A | Texas Instruments Distributor | 74LS74A Inventory
Data sheets are also VERY helpful when replacing chips with one from a different family. Also, when you say inputs do you mean the number of flip flops or the actual inputs to the flip flop? It’s old however you can still datashret them on Amazon. Same D type Flip Flops, but without the extra features of a I always use US sellers only, and found one with free shipping.
I know from know on to just grab them from eBay with free shipping! You have to be careful because the suffix denotes packaging and datashete don’t want to get a SIP or surface found when you want DIP.
I don’t have a background in electronics, so it is all a learning experience.
Is there a reason I can’t sub one of these two for the 74? The datasheets are useful as far as packaging goes. I had ordered a bunch of odds and ends from Jameco, so I ordered the chips with adtasheet stuff, but man they kill you with shipping, and then it is slow to boot!
Also just order from U. I actually did just that today, and ordered some from eBay. You have to be careful when mixing families due to drive capabilities.