INTRODUCTION TO LOGIC FAMILIES <ul><ul><li>What is a logic Family </li></ul></ul><ul><ul><li>It is the way to describe the...
<ul><li>RTL & DTL –  Not used in new design </li></ul><ul><li>    But act as a useful starting point  </li></ul><ul><li>  ...
Characteristics <ul><li>Fan-out    –  Maximum number of standard load    a gate can drive without  disparity </li></ul><ul...
Common Logic Levels Characteristic Table Presentation By Anant Shrivastava (E.I. Fourth Sem) 0 0 - 0.5 V DD V DD V DD  = 3...
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Logic Families Electronics

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a short slide on logic families in electronics along with some quick facts about them. you can contact anant @ http://anantshri.info

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Logic Families Electronics

  1. 1. INTRODUCTION TO LOGIC FAMILIES <ul><ul><li>What is a logic Family </li></ul></ul><ul><ul><li>It is the way to describe the internal circuitry of the I.C. </li></ul></ul><ul><ul><li>Types of logic Families </li></ul></ul><ul><ul><li> We have 7 Basic Logic Families </li></ul></ul><ul><ul><li> 1) RTL – Resistor Transistor Logic </li></ul></ul><ul><ul><li> 2) DTL – Diode Transistor Logic </li></ul></ul><ul><ul><li> 3) IIL – Integrated injection Logic </li></ul></ul><ul><ul><li> 4) TTL – Transistor – Transistor Logic (Ex 7400 & 5400 Series) </li></ul></ul><ul><ul><li> 5) ECL – Emitter Coupled Logic (Ex 10000 series) </li></ul></ul><ul><ul><li> 6) MOS – Metal Oxide Semiconductor </li></ul></ul><ul><ul><li> 7) CMOS – Complementary Metal Oxide Semiconductor </li></ul></ul><ul><ul><li>(Ex. 4000 Series) </li></ul></ul>Presentation By Anant Shrivastava (E.I. Fourth Sem)
  2. 2. <ul><li>RTL & DTL – Not used in new design </li></ul><ul><li> But act as a useful starting point </li></ul><ul><li> RTL was the first Commercial Family </li></ul><ul><li> DTL is now Completely replaced by TTL </li></ul><ul><li>TTL – It is a modified form of DTL </li></ul><ul><li> it is formed by replacing each diode with a transistor </li></ul><ul><ul><ul><ul><ul><li>Basic Gate is NAND </li></ul></ul></ul></ul></ul><ul><li>IIL,MOS – Used in Large Scale Integration </li></ul><ul><li>ECL – Used in High Speed Operations </li></ul><ul><ul><ul><ul><ul><li>Basic Gate is NOR </li></ul></ul></ul></ul></ul><ul><li>CMOS – Where power requirement is low </li></ul><ul><ul><ul><ul><ul><li>Basic Gate is inverter </li></ul></ul></ul></ul></ul>Some Information on each Logic Family Presentation By Anant Shrivastava (E.I. Fourth Sem)
  3. 3. Characteristics <ul><li>Fan-out – Maximum number of standard load a gate can drive without disparity </li></ul><ul><li>Power Dissipation – Power Required to operate the gate </li></ul><ul><li> Expressed in mW. </li></ul><ul><li>Propagation Delay – Time taken by the signal to propagate from input to output when a signal change occur </li></ul><ul><li>Noise Margin – Maximum Noise voltage that can be added to circuit without unwanted effect on output </li></ul><ul><li> (Two Types : - AC & DC Noise) </li></ul><ul><li> Represented in V and represent max level </li></ul>Presentation By Anant Shrivastava (E.I. Fourth Sem)
  4. 4. Common Logic Levels Characteristic Table Presentation By Anant Shrivastava (E.I. Fourth Sem) 0 0 - 0.5 V DD V DD V DD = 3 – 10 CMOS -1.8 -1.9 – -1.6 -0.8 -0.95 – -0.7 V EE = -5.2 ECL 0.2 0 - 0.4 3.5 2.4 – 5 V cc = 5 TTL Typical Range Typical Range Low Level Voltage High Level Voltage Voltage Supply Family Type 3 25 0.1 50 CMOS 0.2 2 25 25 ECL 0.4 10 2 20 Low power Schottky TTL 0.4 3 22 10 Schottky TTL 0.4 10 10 10 TTL Noise Margin Propagation delay aPower Dissipation Fan-out Family

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