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.
|Published (Last):||2 November 2004|
|PDF File Size:||4.29 Mb|
|ePub File Size:||20.9 Mb|
|Price:||Free* [*Free Regsitration Required]|
Yes, my password is: Posted by ljbp 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. A line selector an additional output line on the microcontroller could select which chip to target and cycle through dstasheet set of displays to produce the overall numeric output.
What IC is 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.
If you’re kind enough to send me your address I can send you some. Apr 28, 1, No, create an account now. Other than a little more conditional logic connections datashheet a few more stages, there’s nothing stopping you from building a full digital clock with hours, minutes, and seconds. 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.
Common cathodemeaning the negative connection of all of the LEDs is tied together. Do you already have an account?
Nathan Hale likes this. Is IC power required?
(PDF) 7448 Datasheet download
It seems that this IC does exactly the opposite of what you would id it to do. 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 datashfet had current-sourcing capabilities.
I have learnt about the and Mar 31, 23, 7, Oct 28, 2. There is nothing wrong with the Nov 20, 9. Shown above, is an example application of the 74LS48 7-seg decoder circuit. Nov 20, 6. Nov 20, 7.
7447 IC is wierd!
In this method, the microcontroller would send BCD binary coded decimal on 4 output pins to the chips. 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 748 for applications such as power saving by decreasing the brightness during times of low ambient light.
This is adequate for asserting a logic HI to other TTL logic chips, but it is not very good for driving other things. The is obsolete. 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.
Here is what is going to happen.
Datasheet, PDF – Alldatasheet
Hi guyshope all is well with everyone. Posted by iMayne in forum: Nov dagasheet, 8, 6, If I am reading it right. It was designed to sink current when using common anode 7-segments LED. Posted by praondevou in forum: The Everything-as-a-Service Business Model: Quote of the day.
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. The difference in voltage between pin and the voltage source dtaasheet 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 21, I might have some or chips laying around let me see though A high output is intended to light the segment. Nov 20, All segments are extinguished when a low logical zero signal is applied to pin 4 OUT.
Nov 20, 4. To build a simple dataeheet counter, consider using the decade counter. 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. For example here is the table to display the number 1.
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 if to mention the higher current capacity. Feb 19, 4, Nov 20, 2.