Digital IC Family
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Transcript of Digital IC Family
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Digital IC Family
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Digital IC
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Introduction
• Digital ICs are more reliable by reducing the
number of external interconnections from one
device to another.
• Before ICs, every circuit connection was from
one discrete component to another.
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Cont.,
• A logic family refers to digital integrated
circuit devices which are constructed with
a combination of electronic gates.
• A family has its own power supply voltage
and distinct logic levels.
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Cont.,
• Each family has its own characteristics,
advantages and disadvantages.
• Also within each family, there is a range of
voltages which may be high level or low level.
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Cont.,
• The various logic families can be placed into
two brand categories according to the IC
fabrication process.
• Bipolar
• Metal-oxide semiconductor (MOS)
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Bipolar Logic family
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Metal-oxide semiconductor Logic family
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Bipolar Logic families
• The important elements of a bipolar IC are
resistors, transistors and diodes.
• Based on the two main operations of bipolar ICs,
i.e.,
• Saturated
• Non-saturated.
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Saturated bipolar Logic families
• Resistor-Transistor Logic (RTL)
• Direct-Coupled Transistor Logic (DCTL)
• Diode-Transistor Logic (DTL)
• High Threshold Logic (HTL)
• Transistor-Transistor Logic (TTL)
• Integrated-Injection Logic (IIL)
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Resistor-Transistor Logic
(RTL)
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Direct-Coupled Transistor Logic (DCTL)
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Diode-Transistor Logic (DTL)
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High Threshold Logic (HTL)
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Transistor-Transistor Logic (TTL)
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Integrated-Injection Logic (IIL)
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Non saturated Logic families
• Schottky TTL
• Emitter-coupled Logic (ECL)
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Emitter-coupled Logic (ECL)
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Metal Oxide Semiconductor (MOS)
The MOS families include
• PMOS p-channel MOSFETs
• NMOS n-channel MOSFETs
• CMOS Complementary MOSFETs
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PMOS p-channel MOSFETs
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NMOS n-channel MOSFETs
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CMOS Complementary MOSFETs
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Characteristics of Digital ICs
• Speed of operation
• Power dissipation
• Fan-in
• Fan-out
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Cont.,
• Noise immunity
• Operating temperature
• Power supply requirements
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Speed of operation
• The speed of operation of an IC is expressed in
terms of propagation delay.
• Propagation delay is defined as the time taken
for the output of a gate to change after the
inputs have changed
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Cont.,
• The time difference between the application of
input and appearance of output is also called
as propagation delay.
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Power dissipation
• Power dissipation is the nature of the power
consumed by a logic gate when fully driven by
all its inputs.
• It is expressed in mill watts or nano watts
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Fan in
• The fan-in of a gate is the number of inputs
connected to the gate without degradation in
the voltage levels.
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Fan out
• Fan out is the maximum number of similar
logic gates that a gate can drive without any
degradation in voltage levels.
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Noise immunity
• The noise immunity of a logic circuit refers to
the circuit ability to tolerate noise without
causing spurious changes in the output voltage.
• A quantitative measure of the noise immunity is
called noise margin.
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Operating Temperature
• ALL IC gates are semiconductor devices that are
temperature-sensitive by nature.
• The operating temperature ranges for and IC
vary from 00 C to +700 C for consumer and
industrial applications and from -550 C to + 1250
C for military applications
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Power supply requirements
• The amount of power and supply voltage
required by an IC are the main parameters to
be taken into consideration while choosing a
proper power supply
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The End
……Thank you……
M.S.P.V.L. Polytechnic College,Pavoorchatram.