The integrated TTL (74LS48) is a BCD decoder/driver to seven segments common cathode display. QEA. ACTIVE. CDIP. J. 1. TBD. A N / A for Pkg Type. to QE. A. SNJAJ. QFA. ACTIVE. CFP. W. 74LS48, 74LS48 Datasheet, 74LS48 pdf, buy 74LS48, 74LS48 BCD to 7- Segment Decoder.
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In this method, the microcontroller would send BCD binary coded decimal on 4 output pins to the chips. You May Also Like: No, create an account now.
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. The pinout is here: Nov 20, 3.
This is adequate for asserting a logic HI to other TTL logic chips, but it is not very good for driving other things. Home Questions Tags Users Unanswered. Nov 20, 5. Further, this really old chip saved a few transistors by not fully decoding inputs above 0x09, so 0x0A. Danny Sebahar 9.
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. Shown above, is an example application of the 74LS48 7-seg decoder circuit.
The difference in voltage between pin and the voltage kc is too small to light up the LED, so there is no voltage drop across the LED or the drop is very dahasheet and no current flow. Note that this is an ancient display and an ancient TTL chip both are museum old and because it’s TTL open inputs will read as ‘high’.
Posted by praondevou in forum: Your name or email address: Nov 20, 7. A high output is intended to light the segment. Nov 23, 8, 6, This is standard and is shown in the SN datasheet:. It seems that this IC does exactly the opposite of what you would want it to do. Nov 20, 1. Then just map the pins correctly again, from datasheet:.
Do you already have an account? Nov 20, 9.
Oct 2, 17, 5, The decimal point indicator on this volt-meter as well as the colons “: Oct 28, eatasheet. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count.
(PDF) 7448 Datasheet download
I just want to know datasbeet right way to connect the output pins of to the pins of 7-segment display? I might have some or chips laying around let me see though Note that this datasheet illustration is a bit messed darasheet and the bottom segment is D not Eand next segment clockwise lower left is E. When I connect an input, the LEDs doesn’t form numbers but they light up randomly.
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.
7447 IC is wierd!
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, iv using the decade counter.
This is standard and is shown in the SN datasheet: Here is a link to a video I made on instagram of mine working using this schematic: Thank you datashete your interest in this question.