This chapter deals with the study of the following :
• Logic Levels
• Logic Families
• Integration Levels
• Switching Times
• Propagation Delay
• Fan-in and Fan-out
Normally Binary Logic Values are defined as either Logic ‘1’or Logic ‘0’ depending
on the level of the output voltage. Another additional (intermediate value ) is the
‘Undefined value’.
Logic levels can either be Positive logic or Negative Logic. For eg:
In TTL Logic Levels (positive logic) logic high or Logic 1 is between 2.4V VH 5V
Logic ‘0’ or low logic is between 0V VL 0.4 V and the Undefined value is between
0.4 V <undefined< 2.4 V
Logic families are classified based on either the devices used ,example: diodes
,transistors etc. or the structure of Digital Circuits , example: ECL ,Wired logic etc.
Download Tag | digital logic designing, Electronics and Instrumentation notes |
Download Category | R. V. College of Engineering,Bangalore |
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