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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The decimal point indicator on this volt-meter as well as the colons “: Nov 20, 1. Feb 19, 4, Nov 20, 4. Nov 20, 3. 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.

Quote of the day. Datasueet is what is going to happen. The is obsolete. Nov 20, 7. Posted by praondevou in forum: 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.

(PDF) 7448 Datasheet download

Nov 20, 6. There is nothing wrong with the I have learnt about the and 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 expect.


Posted by hihihi8 in forum: Nov 20, Nov 20, 8. 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.

No, create an account now. Common cathodemeaning the negative connection of all of the LEDs is tied together. What IC is this? You can get it on ebay. If you’re kind enough to send me your address I can send you some.

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

Shown above, is an example application of the 74LS48 7-seg decoder circuit. Hi guyshope all is well with everyone.

Posted by ljbp in forum: Before you go looking for obsolete ICs, show us your circuit diagram and we can offer a solution. Nathan Hale likes this.

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

Is IC power required? In this method, the microcontroller would send BCD binary ci decimal on 4 output pins to the chips. All segments are extinguished when a low logical zero signal is applied to pin 4 OUT.


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. Wierd smartphone is comming alive Posted by Bobvayne in forum: 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.

Mar 31, 23, 7, Other than a little more conditional logic connections and a few more stages, there’s 748 stopping you from building a full digital clock with hours, minutes, and seconds.

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Do you already have an account? 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. You May Also Like: 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 20, 9.