![]() It has 17 AND gate, 4 NOR gate, 6 NOT gates, and 8 NAND gate. These all gates combination makes the IC with 4 input and 7 output pins. The output pins generate two BCD digits in single output, which makes a single number on 7-segment. The IC has 4 input pins which make a total of 16 combinations but the first 10 combinations used to generate the output on 7-segment and the rest of them will be considered as invalid states. The IC is a TTL based device, which allows it to be controlled by any TTL device or microcontroller. It is only used to control common cathode 7-Segments. IC 74LS48 has 4 input pins and Pin 1 represents the third bit of 4-bit input data of the IC. Pin 2 represents the second bit of 4-bit input data of the IC. It is used to make all the output pins HIGH to test all the 7-segment led. In case of LOW state on pin 4, there won’t be any output. It is an active LOW pin, it will make all the output state LOW.
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