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IC Logic Families
Page 2


IC Logic Families
Digital IC Terminology
l Voltage Parameters:
– V
IH
(min): high-level input voltage, the minimum
voltage level required for a logic 1 at an input.
– V
IL
(max): low-level input voltage
– V
OH
(min): high-level output voltage
– V
OL
(max): low-level output voltage
Page 3


IC Logic Families
Digital IC Terminology
l Voltage Parameters:
– V
IH
(min): high-level input voltage, the minimum
voltage level required for a logic 1 at an input.
– V
IL
(max): low-level input voltage
– V
OH
(min): high-level output voltage
– V
OL
(max): low-level output voltage
Current Parameters
l I
IH
(min): high-level input current, the current
that flows into an input when a specified high-
level voltage is applied to that input.
l I
IL
(max): low-level input current
l I
OH
(min): high-level output current
l I
OL
(max): low-level output current
Page 4


IC Logic Families
Digital IC Terminology
l Voltage Parameters:
– V
IH
(min): high-level input voltage, the minimum
voltage level required for a logic 1 at an input.
– V
IL
(max): low-level input voltage
– V
OH
(min): high-level output voltage
– V
OL
(max): low-level output voltage
Current Parameters
l I
IH
(min): high-level input current, the current
that flows into an input when a specified high-
level voltage is applied to that input.
l I
IL
(max): low-level input current
l I
OH
(min): high-level output current
l I
OL
(max): low-level output current
Figure 8-1
Page 5


IC Logic Families
Digital IC Terminology
l Voltage Parameters:
– V
IH
(min): high-level input voltage, the minimum
voltage level required for a logic 1 at an input.
– V
IL
(max): low-level input voltage
– V
OH
(min): high-level output voltage
– V
OL
(max): low-level output voltage
Current Parameters
l I
IH
(min): high-level input current, the current
that flows into an input when a specified high-
level voltage is applied to that input.
l I
IL
(max): low-level input current
l I
OH
(min): high-level output current
l I
OL
(max): low-level output current
Figure 8-1 Fan-Out
l The maximum number of standard logic inputs
that an output can drive reliably.
l Also known as the loading factor.
l Related to the current parameters (both in high
and low states.)
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FAQs on PPT: IC Logic Families - Digital Electronics - Electrical Engineering (EE)

1. What are IC logic families?
Ans. IC logic families refer to a group of integrated circuit (IC) chips that share similar characteristics and functionality in terms of logic gates, operating voltage levels, power consumption, and noise immunity. These families are standardized and widely used in digital electronics for designing and implementing various electronic circuits.
2. How many types of IC logic families are there?
Ans. There are several types of IC logic families, including TTL (Transistor-Transistor Logic), CMOS (Complementary Metal-Oxide-Semiconductor), ECL (Emitter-Coupled Logic), and BiCMOS (Bipolar Complementary Metal-Oxide-Semiconductor). Each of these families has its own unique characteristics and is suitable for specific applications.
3. What are the main differences between TTL and CMOS logic families?
Ans. The main differences between TTL and CMOS logic families lie in their operating voltage levels, power consumption, and noise immunity. TTL operates at higher voltage levels (around 5V) and consumes more power compared to CMOS, but it offers better noise immunity and higher speed. On the other hand, CMOS operates at lower voltage levels (around 3-5V) and consumes less power, but it is more susceptible to noise and has slightly slower speed.
4. Which IC logic family is commonly used in low-power applications?
Ans. CMOS (Complementary Metal-Oxide-Semiconductor) logic family is commonly used in low-power applications due to its lower power consumption compared to other logic families. CMOS circuits are designed to efficiently switch between two complementary states, making them ideal for battery-powered devices, portable electronics, and energy-efficient systems.
5. What factors should be considered when selecting an IC logic family for a specific application?
Ans. When selecting an IC logic family for a specific application, several factors should be considered. These include the desired operating voltage level, power consumption constraints, noise immunity requirements, speed requirements, compatibility with other components or systems, cost considerations, and ease of design and implementation. Evaluating these factors will help in choosing the most suitable logic family for the desired application.
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