Its headquarters are in Dallas, Texas, United States. (TI) is an American technology company that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globally. Method of applying leading-zero suppression to the first three digits of a four-digit display using 74LS47 ICs. Figure 3 shows how to connect the ripple-blanking terminals to the leading zero suppression on the first three digits of the four-digit display.įigure 3. When the BI/RBO terminal is pulled low, all outputs are cleared this pin also functions as a ripple-blanking output terminal. The LT terminal drives all display outputs when the terminal is connected to logic 0 with the RBO terminal open or to logic 1. Note: Figure 1 shows that each of these ICs has three input 'control' terminals, which are designated LT (Lamp Test), BI/RBO, and RBI. 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.

7 segment display multisim using gates