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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7447 IC is wierd!

The is obsolete. Nov 20, 5. 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.

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

Nov 20, 6. Nov 20, 9. 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, Nov 20, 2. Nov 20, 7. Quote of the day. A microcontroller can be programmed to perform the binary to 7448 conversion and then use a look-up chart to perform the segment conversion.


The decimal point indicator on this volt-meter as daatasheet as the colons “: No, create an account now.

(PDF) 7448 Datasheet download

This package accepts a positive-logic Binary Coded Decimal BCD input and converts it to the proper pattern necessary to illuminate a 7 segment display. 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.

Posted by hihihi8 in forum: Nov 20, 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.

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. When you connect the LED, darasheet leg that is normally connected to ground should be connected to thethe leg that is normally connected to voltage source should be connected dataheet voltage source.

I am sure the guys who made this IC knew what they were doing, but my question is why datasheeet the outputs exactly opposite of what you would expect. 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.


Yes, my password is: Here is what is going to happen.

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

If I am reading it right. Nov 20, 4. The difference in voltage between pin datasheef 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.

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

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It was designed to sink current when using common anode 7-segments LED. Nov 23, 8, 6, Shown above, is an example application of the 74LS48 7-seg decoder circuit.

For example here is the table to display the number 1. You May Also Like: Before you go looking for obsolete ICs, show us your circuit diagram and we can offer a solution. Hi guyshope all is well with everyone.