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Lab 1 Structure of a PLD

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Lab 1 Structure of a PLD Powered By Docstoc
					Transistor-Transistor Logic
           (TTL)
        Lecture L4.1
    Transistor-Transistor Logic
               (TTL)
• Developed in mid-1960s
• Large family (74xx) of chips from basic
  gates to arithmetic logic units
• Becoming obsolete with the development of
  programmable logic devices (PLDs)
            TTL Chips
14 13 12 11 10      9   8


                            7 4 0 4 H e x In ve rte rs


1   2   3   4   5   6   7


14 13 12 11 10      9   8


                            7 4 0 8 Q u a d 2 -In p u t A N D G a te s


1   2   3   4   5   6   7


14 13 12 11 10      9   8



                            7 4 3 2 Q u a d 2 -In p u t O R G a te s


1   2   3   4   5   6   7
TTL NAND, NOR, XOR
14   13 12 11 10     9   8


                             7 4 00 Q u ad 2 -Inp u t N AN D G ate s


1    2   3   4   5   6   7



14   13 12 11 10     9   8


                             7 4 02 Q u ad 2 -Inp u t N OR G a te s


1    2   3   4   5   6   7



14   13 12 11 10     9   8


                             7 4 86 Q u ad 2 -Inp u t E XCL U S IV E -O R G a tes


1    2   3   4   5   6   7
     TTL Multiple-input Gates

14   13 12 11 10     9   8


                             7 42 1 Du a l 4 -In pu t AN D Ga tes


1    2   3   4   5   6   7



14   13 12 11 10     9   8


                             7 43 0 8-In pu t N AN D G a te


1    2   3   4   5   6   7
   Small-Scale Integrated (SSI)
            Circuits
• 1 to 10 gates
• NAND gate has 4 transistors
    Medium-Scale Integrated (MSI)
             Circuits
•   10-100 gates
•   Adders
•   Comparators
•   Multiplexers
•   Decoders
   Large-Scale Integrated (LSI)
            Circuits
• 100-1000 gates
• Arithmetic Logic Units
    Very-Large-Scale Integrated
         (VLSI) Circuits
• >1000 gates
• Microprocessors
• Programmable Logic Devices (PLDs)
• Complex Programmable Logic Devices
  (CPLDs)
• Field Programmable Gate Arrays (FPGAs)

				
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posted:5/19/2013
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