74LS47 is a BCD to 7-segment decoder/driver IC. This is an introduction blog to 74LS47 BCD to 7-segment decoder ic, which will cover as much information as possible, including its pinout, features, some useful application circuits and other information. Anyway, i hope you guys like it!This tutorial video shows how to use 74LS47 in a display project.Catalog74LS47 Description74LS47 Pinout74LS47 Features74LS47 Parameter74LS47 Application Circuits74LS47 Package74LS47 ManufacturerComponent DatasheetFAQ74LS47 Description74LS47 is a Low Power Schottky BCD to 7-Segment Decoder/Driver consisting of NAND gates, input buffers and 7 AND-OR-INVERT gates. They offer direct active low, high sink current outputs for driving indicators. 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.74LS47 Pinout74LS4774LS47 Pinout Pin NoPin NameDescription1BBCD input of the IC2CBCD input of the IC3Display test/Lamp testTo test the display LED4Blank InputTo turn-off the LEDs of the display5StoreStore or strobe a BCD code6DBCD input of the IC7ABCD input of the IC8GNDGround Pin9e7 segment output 110d7 segment output 211c7 segment output 312b7 segment output 413a7 segment output 514g7 segment output 615f7 segment output 716VCCSupply Voltage74LS47 FeaturesFunction: Decoder, DemultiplexerTechnology Family: LSVCC (Min): 4.75VVCC (Max): 5.25VChannels: 1Voltage (Nom): 5VMax Frequency at normal Voltage: 35Mhztpd at normal Voltage (Max): 100 nsecConfiguration: 4:7Type: Open-CollectorIOL (Max): 3.2mAIOH (Max): -0.05mARating: CatalogOperating temperature range (C): 0 to 70Bits (#): 7Digital input leakage (Max): 5uAESD CDM (kV): 0.75ESD HBM (kV): 274LS47 ParameterManufacturer:Texas InstrumentsSeries:-Packaging:TubePart Status:ActiveDisplay Type:LEDConfiguration:7 SegmentInterface:BCDDigits or Characters:-Current - Supply:7mAVoltage - Supply:4．75V ~ 5．25VOperating Temperature:0°C ~ 70°CMounting Type:Through HolePackage / Case:16-DIP (0．300" 7．62mm)Supplier Device Package:16-PDIPBase Part Number:SN74LS4774LS47 Application Circuits74LS47 has integral ripple-blanking facilities, but does not include data latches. Figure 1 shows the functional diagrams and pin designations of these devices, each of which is housed in a 16-pin package.Figure 1. Functional diagram of the 74LS47 BCD-to-seven-segment decoder/driver ICs. 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.Figure 2. Basic way of using a 74LS47 IC to drive a common-anode LED display. Note: Figure 1 shows that each of these ICs has three input 'control' terminals, which are designated LT (Lamp Test), BI/RBO, and RBI. The LT terminal drives all display outputs when the terminal is connected to logic 0 with the RBO terminal open or to logic 1. When the BI/RBO terminal is pulled low, all outputs are cleared; this pin also functions as a ripple-blanking output terminal. 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.Figure 3. Method of applying leading-zero suppression to the first three digits of a four-digit display using 74LS47 ICs.74LS47 Package74LS47 ManufacturerTexas Instruments Inc. (TI) is an American technology company that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globally. Its headquarters are in Dallas, Texas, United States. TI is one of the top ten semiconductor companies worldwide, based on sales volume. Texas Instruments's focus is on developing analog chips and embedded processors, which accounts for more than 80% of their revenue. TI also produces TI digital light processing (DLP) technology and education technology products including calculators, microcontrollers and multi-core processors. To date, TI has more than 43,000 patents worldwide.Component Datasheet74LS47 DatasheetFAQWhat is the function of IC 7447?BCD Seven Segment Display Using IC 7447. A decoder is one kind of combinational logic circuit that connects the binary data from n-input lines toward 2n output lines. The IC7447 IC is a BCD to seven segment decoder.What type of display will the 74LS47 drive?Common-anode LED display. The 74LS47 has active-low outputs designed for driving a common-anode LED display via external current-limiting resistors (Rx), as shown in Figure 2. FIGURE 2. Basic way of using a 74LS47 IC to drive a common-anode LED display.What is BCD to 7 segment decoder?BCD to seven segment decoder is a circuit used to convert the input BCD into a form suitable for the display. It has four input lines (A, B, C and D) and 7 output lines (a, b, c, d, e, f and g).How do you display a 7 segment?The displays common pin is generally used to identify which type of 7-segment display it is. As each LED has two connecting pins, one called the “Anode” and the other called the “Cathode”, there are therefore two types of LED 7-segment display called: Common Cathode (CC) and Common Anode (CA).