The seventh segment BCD decoder is used to trade the input within the shape of a Binary Coded Decimal (BCD) password into a password corresponding to the 7 section layout. Decoder 74248 has 4 enter statistics, each A, B, C, and D seven outputs are: a, b, c, d, e, f and some legs for manage ie LT, RB In (RBI), RB Out (RBO). The IC 74LS248 foot configuration is proven within the following discern.
Configure Pin 7 BD Decoder to phase 74LS248
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characteristic every Foot On Decoder 74LS248:
feet A0 – A3 serves as a four bit BCD records enter direction.
Leg RBI serves as input manipulate Riple Blanking input.
LT Foot serves as a Lamp test manage input.
BI / RBO toes features as enter control Blanking input or Riple Blanking Output.
The a – g leg serves as an output for the 7 section not unusual anode viewer
To operate a 74LS248 decoder for a – g output to provide a decimal view of the BCD information on A0 – A3 inputs LT and BI / RBO legs are given high good judgment then BCD records is given on the A0 – A3 legs. LT facility (Lamp take a look at is used to check the circumstance of the 7 phase viewer BI / RBO Facility features to do away with input records and gives clean show to 7 segment viewer. The TLLS248 decoder truth table is proven in the following desk.
desk of Truths IC 74LS248
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The ensuing show man or woman of the 74LS248 decoder in the 7 section common anode viewer is shown within the following determine.