Lec5-6decoders - ECE 2110: Introduction to Digital Systems...

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ECE 2110: Introduction to Digital Systems Chapter 6 Combinational Logic Design Practices Decoders
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2 Previous… Circuit Timing
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3 Decoder Multiple-input/multiple-output device. Inputs ( n ) are less than outputs ( m ). Converts input code words into output code words. One-to-One mapping : - Each input code produces only one output code. Input codes : - Binary Code - Your Code ! Output Codes 1-out-of-m code Gray Code BCD Code enable inputs
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4 Display Decoders Seven segment display for decimal digits. Consider the function for the ‘a’ (top segment) signal. How many inputs? Design the decoder: SOP vs. POS
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5 Binary Decoders n-to- 2 n decoder : n inputs and 2 n outputs. Input code : n bit Binary Code. Output code : 1-out-of- 2 n , One output is asserted for each input code. Example : n=2, 2-to-4 decoder Note “x” (don’t care input notation).
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6 Binary 2-to-4 decoder
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7 MSI Binary 2-to-4 decoder: 74x139 Input buffering (less load) NAND gates (faster)
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This note was uploaded on 12/25/2009 for the course ECE 2300 at Cornell University (Engineering School).

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Lec5-6decoders - ECE 2110: Introduction to Digital Systems...

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