According to the datasheet the A and A ICs feature active-low outputs designed for driving common-anode LEDs or. DMA, DMA. BCD to 7-Segment Decoders/Drivers. General Description. The 46A and 47A feature active-low outputs designed for. DECODER. The SN54/74LS48 is a BCD to 7-Segment Decoder consisting of NAND gates, input buffers and seven . This datasheet has been download from: .
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When I connect an input, the LEDs doesn’t form numbers but they light up randomly. You need to tie them to appropriate logic levels RBI should be ‘0’ if you want to display a zero.
ON Semiconductor – datasheet pdf
However, they don’t seem to mention that you need to have the inputs of the connected to something for it to work like you want it to. Thank you for your interest in this question. Simply wire the respective letters a. Spehro Pefhany k 4 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’. I’ve connected a decoder to 7-segment display as shown in figure. Home Dagasheet Tags Users Unanswered.
You can use a diode tester or a simple voltage source and a resistor to determine the pinout of your particular datasheef. Then just map the pins correctly again, from datasheet:.
Each segment on a 7-segment display is designated a letter A-G. This is standard and is shown in the SN datasheet: Armandas 6, 1 23 Then just map the pins correctly again, from datasheet: 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.
7447 – 7447 BCD to 7-Segment Decoder/Driver with Open Collector Output Datasheet
The pinout is here: Here is a link to a video I made on instagram of mine working decode this schematic: Further, this really old chip saved a few transistors by not fully decoding inputs above 0x09, so 0x0A. 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.
This is standard and is shown in catasheet SN datasheet:.
Like the other two most popular answers, your 7 segment display needs to be connected to the properly Outputs to Seven-segment display inputs: How to connect decoder to 7-segment display? Would you like to answer one of these unanswered questions instead?
The pinout is here:.