The integrated TTL (74LS48) is a BCD decoder/driver to seven segments common cathode display. QEA. ACTIVE. CDIP. J. 1. TBD. A N / A for Pkg Type. to QE. A. SNJAJ. QFA. ACTIVE. CFP. W. 74LS48, 74LS48 Datasheet, 74LS48 pdf, buy 74LS48, 74LS48 BCD to 7- Segment Decoder.

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Nov 20, 1. Oct 28, 2. Hi guyshope all is well 74448 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 kc opposite of what you would expect. For example here is the table to display the number 1.

74LS48 BCD to 7-segment Decoder Driver IC | Warefab

Nov 20, 2. Oct datasehet, 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.

(PDF) 7448 Datasheet download

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 744. 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 let 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 The is obsolete.

You can get it on ebay. If datasheft 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 current-sourcing capabilities. If you just checked the output voltage of unloaded 5V TTL signals when they were HI it was not uncommon 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. Nov 21, Nov 23, 8, 6, Wierd smartphone is comming alive Posted by Bobvayne in forum: Is IC power required? Posted by hihihi8 in forum: What IC is this?

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7447 IC is wierd!

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