Basic way of using a 74LS47 IC to drive a common-anode LED display. The 74LS47 has active-low outputs designed to drive a common-anode LED display via external current-limiting resistors (Rx) as shown in Figure 2.įigure 2. Functional diagram of the 74LS47 BCD-to-seven-segment decoder/driver ICs. Seven NAND gates and one driver are connected in pairs to make BCD data and its complement available to the seven AND-OR-INVERT gates.ħ4LS47 has integral ripple-blanking facilities, but does not include data latches.įigure 1 shows the functional diagrams and pin designations of these devices, each of which is housed in a 16-pin package.įigure 1. They offer direct active low, high sink current outputs for driving indicators. This tutorial video shows how to use 74LS47 in a display project.ħ4LS47 is a Low Power Schottky BCD to 7-Segment Decoder/Driver consisting of NAND gates, input buffers and 7 AND-OR-INVERT gates.
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