BCD to. 7-Segment. Decoder. January DM74LS BCD to 7-Segment Decoder. General Description . This datasheet has been downloaded from: www. 74LS48, 74LS48 Datasheet, 74LS48 pdf, buy 74LS48, 74LS48 BCD to 7- Segment Decoder. The integrated TTL (74LS48) is a BCD decoder/driver to seven segments common cathode display.
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I’ve connected a decoder to 7-segment display as shown in figure. When I connect an input, the LEDs doesn’t form numbers but they light up randomly.
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I just want to know the right way to connect the output pins of to the pins of 7-segment display? Each segment on a 7-segment display is designated a letter A-G. This is standard and is shown in the SN datasheet:. You can use a diode tester or a simple voltage source and a resistor to determine the pinout of your particular display.
Digital Display Circuits
Then just map the pins correctly again, from datasheet:. Note that this datasheet illustration is a bit messed up and the bottom segment is D not Eand next segment clockwise lower left is E.
The pinout is here:. Simply wire the respective letters a. Pin 5 should go to GND.
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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’. You need to tie them to appropriate logic levels RBI should be ‘0’ if you want to display a zero. 748
Further, this really old chip saved a few transistors by not fully decoding inputs above 0x09, so 0x0A. Like the other two most popular answers, your 7 segment display needs to be connected to the properly Outputs to Seven-segment display inputs: However, they don’t seem to mention that you need to have the inputs of the connected to something for it to work decoer you want it to.
Here is a link to a video I made on instagram of mine working using this schematic: Thank you for your interest in this question.
Because it has attracted low-quality or decoderr answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count. Would you like to answer one of these unanswered questions instead? Home Questions Tags Users Unanswered. How to connect decoder to 7-segment display? Michael George 1, 8 34 This 74448 standard and is shown in the SN datasheet: Then just map the pins correctly again, from datasheet: Armandas 6, 1 23 The pinout is here: Spehro Pefhany k 4 Danny Sebahar 9.