PPT: IC Logic Families | Digital Electronics - Electrical Engineering (EE) PDF Download

 Page 1


IC Logic Families
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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
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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.)