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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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Posted by hihihi8 in forum: Nov 23, 8, 6, Nov 20, 7. A line selector an additional output line on the microcontroller could select which chip to target and cycle icc the set of displays to produce the overall numeric output.

BCD to 7-Segment Decoder and Driver (For Common Cathode)

If you’re kind enough to send me your address I can send you some. 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. Oct 28, 2. You can get it on ebay.

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.

Quote of the day. A microcontroller can be programmed to perform the binary to decimal conversion and then use a look-up chart to perform the segment conversion. There is nothing wrong with the A high output is intended to light the segment. Making AI, Drones, and Robotics More Accessible The “as-a-Service” model is changing the way innovators use new technologies—sometimes by giving access to new technologies that would be out of their grasp otherwise.


Nov 21, Posted by iMayne in forum: Nov 20, 2. Nov 20, 5. The is obsolete. Nov 20, 6. It was designed to sink current when using common anode 7-segments LED.

The decimal point indicator on this volt-meter as well as the colons “: You May Also Like: Hi guyshope all is well with everyone. Nathan Hale likes this. Oct 2, 17, 5, Shown above, is an example application of the 74LS48 7-seg decoder circuit. Posted by ljbp in forum: 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.

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, 9.


This is adequate for asserting a logic HI to other TTL logic chips, but it is not very good for driving other things.

No, create an account now. Nov 20, 3. All segments are extinguished when a low logical zero signal is applied to pin 4 OUT.

(PDF) 7448 Datasheet download

Do you already have an account? This package accepts a positive-logic Iv Coded Decimal BCD input and converts it to the proper pattern necessary to illuminate a 7 segment display.

If I am reading it right. To build a simple digital counter, consider using the decade counter.

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. Apr 28, 1, Before you go looking for obsolete ICs, show us your circuit diagram and we can offer a solution. For example here is the table to display the number 1. Feb 19, 4, Is IC power required? Ix Everything-as-a-Service Business Model: Common cathodemeaning the negative connection of all of the LEDs is tied together.

I have learnt about the and However, if pins are limited on the microcontroller, it can be advantageous to use ICs in a multiplexing fashion to drive the 7-segment displays.