74LS48 is a BCD to 7-Segment Decoder consisting of NAND gates, input buffers and seven AND-OR-INVERT gates.
Seven NAND gates and one driver are connected in pairs to make BCD data and its complement available to the seven decoding AND-OR-INVERT gates.
The remaining NAND gate and three input buffers provide lamp test, blanking input/ripple blanking input for the LS48.
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