Combinational logic Circuits Chapter 3 Integrated Digital Circuit
Combinational logic circuits Chapter 3 Integrated Digital Circuit
INTRODUCTION Level five Complex Systems, Function Units from levels Two through Four evel four More complex Function Logic Units, e.g. Third Ic level(VLSI) microprocessor d three Function Logic Units, e.g. adders, Second ic level counters, multiplexers (MSI and LSI) Level two Function Logic Units, e.g. gates, NOT AND NAND, EX-OR First IC level (SSI) Level one Electronic Components,e.g. transistors, Components level diodes, resistors, capacitors
INTRODUCTION Components level First IC level (SSI) Level four Level three Level five Electronic Components, e.g. transistors, diodes, resistors, capacitors Function Logic Units, e.g. gates, NOT, AND, NAND, EX-OR Function Logic Units, e.g. adders, counters, multiplexers More complex Function Logic Units, e.g. microprocessor Complex Systems, Function Units from levels Two through Four Third IC level (VLSI) Second IC level (MSI and LSI) Level two Level one
INTRODUCTION a The most common transistor-transistor logic (TTL) a emitter-coupled logic(ECL) a complementary metal-oxide semiconductor logic(CMOS a Each of these main logic families is made up of numerous subfamilies
INTRODUCTION The most common ◼ transistor-transistor logic (TTL) ◼ emitter-coupled logic (ECL) ◼ complementary metal-oxide semiconductor logic (CMOS). Each of these main logic families is made up of numerous subfamilies
INTRODUCTION SN54/74ALSOO SN is a prefix. The prefix indicates the manufacturer the number 54 indicates a military operating temperature range and 74 indicate a commercial temperature range both temperature ranges are available for most functions and subfamilies the letter-number combination following the sn54/74 indicates the subfamily and the logical function of the IC SN74ALSOo is a commercial temperature range advanced low-power schottky Nand gate IC manufactured by Texas instruments
INTRODUCTION SN54/74ALS00 ◼ SN is a prefix. The prefix indicates the manufacturer. ◼ The number 54 indicates a military operating temperature range and 74 indicate a commercial temperature range. Both temperature ranges are available for most functions and subfamilies. ◼ The letter-number combination following the SN54/74 indicates the subfamily and the logical function of the IC. ◼ SN74ALS00 is a commercial temperature range advanced low-power schottky NAND gate IC manufactured by Texas instruments
Decoder a Decoder convert a set of input variables representing a code into a set of variables representing a different code. The relationship between the input and output codes can be expressed in a truth table a Encoded information is presented as n inputs producing 2n outputs. The outputs values can range from 0 to 2n-1 a Some decoder generate outputs over a truncated portion of possible values
Decoder Decoder convert a set of input variables representing a code into a set of variables representing a different code. The relationship between the input and output codes can be expressed in a truth table. Encoded information is presented as n inputs producing 2n outputs. The outputs values can range from 0 to 2n -1. Some decoder generate outputs over a truncated portion of possible values