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!
Mar 31, 23, 7, Nov 20, 9. The decimal point indicator on this volt-meter as well as the colons “: Here is what is going to happen.
This is adequate for asserting a logic HI to other TTL logic chips, but it is not very good for driving other things. Posted by ljbp in forum: Posted by praondevou in forum: Hi guyshope all is well with everyone. 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.
If you’re kind enough to send me your address I can send you some. The Everything-as-a-Service Business Model: Nov 20, 3.
A high output is intended to light the segment. Nov 20, 4. Yes, my password is: 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. Nov 20, No, create an account now. If I am reading it right. Shown above, is an example application of the 74LS48 7-seg decoder circuit.
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.
You can get it on ebay. Before you go looking for obsolete ICs, show us your circuit diagram and adtasheet can offer a solution. Nov 20, 5.
It seems that this IC does exactly the opposite of what you would want it to do. Your name or email address: Oct 2, 17, 5, Common cathodemeaning the negative connection of all of the LEDs is tied together. Nov 20, datasneet. Nov 20, 2.
(PDF) 7448 Datasheet download
To build a simple digital counter, consider using the decade counter. Is IC power required? Do you already have an account? Wierd smartphone is comming alive Posted by Bobvayne in forum: 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.
In this method, the microcontroller would send BCD binary coded decimal on 4 output pins to the chips. Posted datadheet iMayne in forum: 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.
Datasheet, PDF – Alldatasheet
Posted by hihihi8 in forum: You May Also Like: Nov 23, 8, 6, Nathan Hale likes this. 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. 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 vatasheet not to mention the higher current capacity.
I have learnt about the and All segments are extinguished when a low logical zero signal is applied to pin 4 OUT.