This means that instead of getting an LLHH output when “3” is selected, as in the previous encoder, you get HHLL. The 74LS147 provides the same basic function as the circuit shown in Fig. Figure 12.40 shows a 74LS147 decimal-to-BCD (10-line-to-4-line) priority encoder IC. (The switch acts as an active-low input.) The truth table in Fig. To generate a BCD output that is equivalent to a single selected decimal input, the switch corresponding to that decimal is closed. In this circuit, normally all lines are held high by the pull-up resistors connected to +5 V. To illustrate this in a simple manner, let’s take a look at the simple decimal-to-BCD encoder circuit shown below. ![]() They are used to generate a coded output from a single active numeric input. INTRODUCTION Encoders are the opposite of decoders.
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