Your SlideShare is downloading. ×
Basics of digital ic
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×

Introducing the official SlideShare app

Stunning, full-screen experience for iPhone and Android

Text the download link to your phone

Standard text messaging rates apply

Basics of digital ic

1,195
views

Published on

description of digital IC

description of digital IC

Published in: Education, Technology, Business

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
1,195
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
63
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide
  • TTL = Transistor Transistor Logic, HC / HCT stands for High-speed CMOS Logic (HCL)
  • Transcript

    • 1. DIGITAL IC
    • 2. What is Logic Family? Group of logic gates having compatible logic levels and power supply characteristics. Set of techniques used to implement logic within VLSI integrated circuits
    • 3. Logic Families Resistor–transistor logic (RTL) Diode–transistor logic (DTL) Emitter-coupled logic (ECL) Transistor–transistor logic (TTL) P-type metal–oxide–semiconductor logic (PMOS) N-type metal–oxide–semiconductor logic (NMOS) Complementary metal–oxide–semiconductor logic (CMOS) Bipolar complementary metal–oxide–semiconductor logic (BiCMOS) Integrated injection logic (I2L)
    • 4. Basic Concepts Fan In: Maximum no. of inputs of gate  Increase in fan in increases gate delay Fan out: Maximum no. of outputs gate can drive  The fan-out really depends on the amount of electric current a gate can source or sink while driving other gates.  Increase in fan out can affect noise margin, operating temperature, rise time, fall time and propagation delay.
    • 5. Basic Concepts Gate delay  Delay offered by a gate for the signal appearing at its input, before it reaches the gate output.  Also known as propagation delay. Wire Delay  Delay offered by interconnection between gates  Also known as interconnect delay
    • 6. Basic Concepts Skew  The same signal arriving at different parts of the design with different phase is known as skew.  Normally refers to clock signals
    • 7. Basic Concepts Logic levels  VOHmin : The minimum output voltage in HIGH state (logic 1). VOHmin is 2.4 V for TTL and 4.9 V for CMOS.  VOLmax : The maximum output voltage in LOW state (logic 0). VOLmax is 0.4 V for TTL and 0.1 V for CMOS.  VIHmin : The minimum input voltage guaranteed to be recognised as logic 1. VIHmin is 2 V for TTL and 3.5 V for CMOS.  VILmax : The maximum input voltage guaranteed to be recognised as logic 0. VILmax is 0.8 V for TTL and 1.5 V for CMOS.
    • 8. Basic Concepts Current levels  Source and sink capability Noise Margin  Low noise margin (LNM) = VILmax-VOLmax  High noise margin (HNM) = VOHmin-VIHmin Rise time (tr) Fall time (tf) Propogation delay (tpd)  The time between the logic transition on an input and the corresponding logic transition on the output of the logic gate.
    • 9. Basic Concepts Power dissipation  Static power dissipation  Dynamic power dissipation
    • 10. Logic Thresholds And Outputs ForDifferent Logic Families  The term threshold is used to specify the voltage in which an electrical signal is determined to be a 1 or 0”
    • 11. Gate Transition Times And Current SinkCapability For Different Logic Families
    • 12. Practical digital signal
    • 13. Thank You