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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Each segment on a 7-segment display is designated a letter A-G.

Pin 5 should go to GND. Thank you for your interest in this question.

When I connect an input, the LEDs doesn’t form numbers but they light up randomly. 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:.

ON Semiconductor

Like the other two most popular answers, your 7 segment display needs to be connected to the properly Outputs to Seven-segment display inputs: Here is a link to a video I made on instagram of mine working using this schematic: Michael George 1, 8 34 Then just map the pins correctly again, from datasheet: Armandas 6, 1 23 Home Questions Tags Users Unanswered. Further, this really old chip saved a few transistors by not fully decoding inputs above 0x09, so 0x0A.


Danny Sebahar 9. 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.

Simply wire the respective letters a. You need to tie them to appropriate logic levels RBI should be ‘0’ if you want to display a zero. 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.

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’. The pinout is here: How to connect decoder to 7-segment display? This is standard and is shown in the SN datasheet: I’ve connected a decoder to 7-segment display as shown in figure.

Spehro Pefhany k 4 Then just map the pins correctly again, from datasheet:. By using our site, you acknowledge that you have read and understand our 77447 PolicyPrivacy Policyand our Terms of Service. This is standard and is shown in the SN datasheet:.


ON Semiconductor – datasheet pdf

You can use a diode tester or a simple voltage source and a edcoder to determine the pinout of your particular display. Would you like to answer one of these unanswered questions instead? I just want to know the right way to connect the output pins of to the pins of 7-segment display?