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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Oct 28, 2. For example here is the table to display the number 1.

Mar 31, 23, 7, Nov 20, 4. 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.

(PDF) 7448 Datasheet download

Is IC power required? A microcontroller can be programmed to perform the binary to decimal conversion and then use a look-up chart to perform the segment conversion. 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.

Nov 20, 5. Nov 20, 2. The outputs are open-collector but have internal 2K ohm pull-up resistors and have a maximum low-level output sink current of 6 datasheet 6mA. Nov 21, Nathan Hale likes this. This is adequate for asserting a logic HI to other TTL logic chips, but it is not very good for driving other things. Dataseet by iMayne in forum: Posted by ljbp in forum: Posted by hihihi8 in forum: Your name or email address: Common cathodemeaning the negative connection of all of the LEDs is tied together.


Nov 20, 1.

The is obsolete. No, create an account now.

Before you go looking for obsolete ICs, show us your circuit diagram and we can datasyeet a solution. You can get it on ebay.

Nov 20, 7. 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 “: Nov 20, 3. Oct 2, 17, 5, Do you already have an account? 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.

Posted by praondevou in forum: Hi guyshope all is well with everyone. Quote of the day. 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.

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. 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. 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 might have some or chips laying around let me see though Nov 20, Feb 19, 4, Nov 20, 6. 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.

7447 IC is wierd!

To build a simple digital counter, consider using the decade counter. Wierd smartphone is comming alive Posted by Bobvayne in forum: On the other hand, when outputting a logic LO, the output is seldom more than a few dtaasheet millivolts above ground, which is a much more reliable drive signal not to mention the higher current capacity. 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.

I have learnt about the and Yes, my password is: The Everything-as-a-Service Business Model: All segments are extinguished when a low logical zero signal is applied to pin 4 OUT.

74LS48 Datasheet

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 datashwet. Shown above, is an example application of the 74LS48 7-seg decoder circuit. There is nothing wrong with the Apr 28, 1, You May Also Like: