said circuitry and specifications. Page 7. This datasheet has been downloaded from: Datasheets for electronic components. Home > Integrated Circuits > 74 Series > 74LS Series. 74LS48 – 74LS48 BCD to 7-segment Decoder/Driver Datasheet – Buy 74LS Technical Information. QEA. ACTIVE. CDIP. J. 1. TBD. A N / A for Pkg Type. to QE. A. SNJAJ. QFA. ACTIVE. CFP. W.
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Nov 20, 1. Oct 28, 2. Hi guyshope all is well with everyone. I have learnt about the and It seems that this IC does exactly the opposite of what you would want it to do.
I am sure the guys who made this IC knew what they were doing, but my question is why are the outputs exactly opposite of what you would expect. For example here is the table to display the number 1.
Nov 20, 2. Oct 2, 17, 5, There is nothing wrong with the It was designed to sink current when using common anode 7-segments LED.
Nathan Hale likes this. Nov 20, 3. Feb 19, 4, If I am reading it right.
When you connect the LED, the leg that is normally connected to ground should be connected to thethe leg that is normally connected to voltage source should be connected to voltage source. Here is what is going to happen.
The difference in voltage between pin and the voltage source is too small to light up the LED, so there is no voltage drop across the LED or the drop is very small and no current flow. When you want to light up the LED, you daasheet the pin on to go low, this makes the pin a “ground” for the voltage source, now there is a voltage drop across the LED and there is flow of current, the LED lights up.
Nov 20, 4. Nov 20, 5. The is obsolete.
(PDF) 7448 Datasheet download
You can get it on ebay. If you’re kind enough to send me your address I can send you some. Nov 20, 6. Nov 20, 7. Mar 31, 23, 7, And, to bring things full circuit, the reason that TTL uses predominantly active LO drives is that particularly the early TTL families has significantly strong current-sinking capabilities than they had ix capabilities.
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If you just checked the output voltage of unloaded 5V TTL signals when they were HI it was not ix to see them in the 3. This is adequate for asserting a logic HI to other TTL logic chips, but it is not very good for driving other things.
On the other hand, when outputting a logic LO, the output is seldom more than a few hundred millivolts above ground, which is a much more reliable drive signal not to mention the higher current capacity. Nov 20, 8. Nov 20, 9. Nov 20, Apr 28, 1, I might have some or chips laying around let me see though Before you go looking for obsolete ICs, show us your circuit diagram and we can offer a solution.
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