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.

Author: Mura JoJole
Country: Armenia
Language: English (Spanish)
Genre: Politics
Published (Last): 24 May 2008
Pages: 418
PDF File Size: 8.5 Mb
ePub File Size: 14.67 Mb
ISBN: 541-3-25096-404-8
Downloads: 40782
Price: Free* [*Free Regsitration Required]
Uploader: Tygogor

Hi guyshope all is well with everyone.

7447 IC is wierd!

Other than a little more conditional logic connections and a few more stages, there’s nothing stopping you from building a full digital clock with hours, minutes, and seconds.

Do you already have an account?

Oct 28, 2. Quote of the day.

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. Nov 23, 8, 6, Oct 2, 17, 5, Nov 20, 1.

No, create an account now. Nov 20, 3. The difference in voltage uc 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. If you’re kind enough to send me your address I can send you some.


Here is what is going iic happen. 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. I have learnt about the and There is nothing wrong with the It was designed to sink current when using common anode 7-segments LED.

Your name or email address: Common cathodemeaning the negative connection of all of the LEDs is tied together. 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.

Posted by iMayne in forum: A microcontroller can be programmed to perform the binary to decimal conversion and then use a look-up chart to perform the segment conversion. This is adequate for asserting a logic HI to other TTL logic chips, but it is not very good for driving other things.

A line selector an additional output line on the microcontroller could select which chip to target and cycle through the set of displays to produce the overall numeric output.

74LS48 Datasheet

A PWM pulse-width modulated signal can be applied to this pin to provided varying brightnesses to the LED display being driven, allowing user control of LED dimming for applications such as power saving by decreasing the brightness during times of low ambient light. The decimal point indicator on this volt-meter as well as the colons “: In this method, the microcontroller would send BCD binary coded decimal on 4 output pins to the chips.


Posted by ljbp in forum: Posted by praondevou in forum: The Everything-as-a-Service Business Model: Apr 28, 1, For example here is the table to display the number 1.

Nov 20, 9. I might have some or chips laying around let me see though Feb 19, 4, Nov 20, 7. 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.

Wierd smartphone is comming alive Posted by Bobvayne in forum: Nov 20, 6.

Author: admin