A Digital Decoder IC, is a device which converts one digital format into another and one of the most commonly used binary for doing this is called the Binary Coded Decimal BCD to 7-Segment Display Decoder. In order to produce the required numbers or HEX characters from to and A binary F respectively, on the display the correct combination of LED segments need to be illuminated and BCD to 7-segment Display Decoders such as the 74LS47 do just that. A standard 7-segment LED display generally has 8 input connections, one for each LED segment and one that acts as a common terminal or connection for all the internal display segments. Some single displays have also segment an additional input pin to display a decimal point in their lower right or left hand corner. Electrical connection of the individual diodes for a common cathode display and a display anode display and by illuminating each light emitting diode individually, they can be made to display a variety of numbers or characters. So in order to display the number for example, segments abcd and g would need to be illuminated. If we wanted to display a different number or letter then a different set of segments would need to be illuminated. Then for a 7-segment display, we can produce a truth table giving the segments that need to be illuminated segment order to produce the required character as shown below. Also as the segments are display a standard light emitting diode, the driving circuit would need to produce up to 20mA of current to illuminate each binary segment and to display the number 8all 7 segments would need to be lit resulting a total current of nearly 140mA, 8 x 20mA. A binary coded decimal BCD to 7-segment display decoder such as the TTL 74LS47 or 74LS48, have 4 BCD inputs and 7 output lines, one for each LED segment. This allows a smaller 4-bit binary number half a byte to be used to display all the denary numbers from to and by adding two displays together, a full range of numbers from to can be segment with just display single byte of 8 data bits. The use of packed BCD allows two BCD digits to be stored within a single byte 8-bits of data, allowing a single data byte to hold a BCD number in the range of to An example of the 4-bit BCD input representing the number is given below. There display different display decoders and drivers available for the different types of available displays, either LED or LCD. For example, the 74LS48 for common-cathode LED types, the 74LS47 for common-anode LED types, or the CMOS CD for liquid crystal display LCD types. The 74LS147 is a 10-to-4 line BCD decoder which would work better. S Posted on October 05th pm Reply n na sir, can you send me a wiring connection from decoder to hex display 7 LED since the one I have hex segment holds 5 pins up and 5 pins down but confused how to connect the one I have has no numbering as I understood correct please if facing the display first up left pin in 10 next to it 9 next com 8 what means negative supply? The 74LS147 is a 10-to-4 line BCD decoder which would work better Posted on September 30th am Reply A Abdul Razak Posted on August 20th am Reply s salim malik Posted on May 20th pm Reply a ahmed ww abdulaa we are electrical engineer and we think your project its a not bad explaining. All Rights Binary Looking for the latest from TI?
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