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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It was frustration from knowing I have to place another order just for one chip!!! Again, thanks for the information, everyone!
Instead of waiting two weeks too, if I were you i’d just bite the bullet and order some of those particular chips. Thanks for the reply! Of course, maybe there is, and I am just too dumb to find it, lol.
I prefer Digikey over Jameco as they have more parts, and the 74os74a Mail shipping is usually cheaper 74ls774a you don’t order anything to heavy. Mouser is another good source as well. I am fairly new to the hobby, but am really enjoying learning.
I hate to wait another week or two for one chip. It would be nice if there was even a guide somewhere as to what the suffixes on some of these chips mean Also just order from U.
The middle two characters denote specific of the family. Same D type Flip Flops, but without the extra features of a I learned the hard way on some cheap TTL replacements from Mouser. I am always impressed by the amount of knowledge that some of you all have! It has a lot of great information. Wouldn’t the board just ignore the datasheey inputs? 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.
Many times you can get a small qty of common chips, shipped, for a buck or two. The suffixes are often manufacturer-specific, so you’d need to consult that manufacturer’s datasheet and hope it’s detailed.
The datasheets are useful as far as packaging goes. Also, when you say inputs do you mean the number of flip flops or the actual inputs to the flip flop? You have to be careful when mixing families due to drive capabilities.
Hopefully, I will be answering the questions one of these days! I actually did just that today, and ordered some from eBay. The down side of Digikey is the site can datassheet hard to navigate to find what you want, but once you get used to the parametric search it is actually pretty fast. Should we ignore that they don’t have the same number of pins?
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.
(PDF) 74LS74A Datasheet download
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 faked and usually you should be alright. Data sheets are also VERY helpful when replacing chips with one from a different family. Not all parts are the same. Definitely a learning experience. I don’t dqtasheet a background in electronics, so it is all a learning experience.
In most cases, if the last numbers are not the same, then the IC is not plug-in compatible.
I was a little worried about fakes, although like you said, on inexpensive chips, there isn’t much incentive. 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 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! You don’t really need to worry much about fakes for the standard TTL families, in my opinion.
74LS74A Datasheet
A good book for reference is the TTL Cookbook. The manufacturer sites are also good for getting specifics about what you want. It is definitely frustrating at times, simply trying to digest all of this information. Lol, crap, I was thinking they had the same number of pins.
74LS74 Manufacturer, Function, Datasheet – Alldatasheet, IC D FLIP-FLOP, PDIP14, FF/Latch
I always use US sellers only, and found one with free shipping. Look up the data sheets for the devices, compare pinouts, compare truth tables, etc. Thanks for the help, everyone.
I know that the 74 is a dual d-type datasheeg flop, while the is a hex d-type flip flop with clear, and the is a quad d-type flip flop with clear.
I have been trying to learn the datasheets on these things. In general, it’s fairly safe to ignore the suffix, as it’s usually not of any real consequence for arcade applications. This is where datasheets are VERY 74ls74z. I know from know on to just grab them from eBay with free shipping! C most often means ceramic but TI uses J; some others used D P most often means plastic 74le74a TI uses N Another bit of data sometimes coded in the suffix is the temperature range i.
74LS74 Datasheet(PDF) – Motorola, Inc
Is there a reason I can’t sub one of these two for the 74? Quite often, at least one of the suffixes refers to the package. Okay, I will answer the why first.