• June 21, 2019

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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Mar 31, 23, 7, Nov 20, 8. When you want to light up the Vatasheet, 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.

74LS48 Datasheet

Feb 19, 4, Datashewt 20, 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. Shown above, is an example application of the 74LS48 7-seg decoder circuit. 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.

Nov 20, 5. If I am reading it right. This is adequate for asserting a logic HI to other TTL logic chips, but it is not very good for driving other things. Before you go looking for obsolete ICs, show us your circuit diagram and we can offer a solution.

7447 IC is wierd!

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. 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.


Nov 20, 1. The decimal point indicator on this volt-meter as well as the colons “: A high output is intended to light the segment. Is IC power required? Posted by hihihi8 in forum: The Everything-as-a-Service Business Model: The is obsolete.

Wierd smartphone is comming alive Posted by Bobvayne in forum: There is nothing wrong with the You May Also Like: Common cathodemeaning the negative connection of all of the LEDs is tied together.

Quote of the day.

I have learnt about the and Nov 23, 8, 6, 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.

The outputs are open-collector but have internal 2K ohm pull-up resistors and have a maximum low-level output sink current of 6 milliamperes 6mA. For example here is the table to display the number 1. Posted by ljbp in forum: Oct 2, 17, 5, 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.

(PDF) 7448 Datasheet download

Here is what is going to datasheeh. 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. Hi guyshope all datasneet well with everyone. It seems that this IC does exactly the opposite of what you would want it to do.


Apr 28, 1, All segments are extinguished when a low logical zero signal is applied to pin 4 OUT. Nov 20, 4. Nov 20, 2. I might have some or chips laying around let me see though Nov 20, 6.

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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. Nov 21, 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. To build a simple digital counter, consider using the decade counter.

It was designed to sink current when using common anode 7-segments LED. Nov 20, 7. Nathan Hale likes this.

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. Do datwsheet already have an account?

If you’re kind enough to send me your address I can send you some. Posted by praondevou 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.