The T331 four-wire-ten-line decoder is a BCD code input, a general-purpose decoder for the decimal input. It consists of eight inverters and ten 4-input NAND gates. The eight inverters are connected. Four pairs, providing ten NAND gate decoding BCD input data, fully decoding the valid BCD input, and when representing the pseudo code input without state, the output of the decoder is all "1", ie Reject the pseudo code. The outer lead arrangement and function of the T331 four-line-ten line decoder are shown in Figure 9.21. The truth table of the T331 four-line-ten line decoder is shown in Table 9.36.
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