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Digital Circuits Chapter 3: Logic Gates
Important things to recognize in Digital Circuits for Logic Gates
46
Electrical Engineering
Undergraduate 2
09/03/2013

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Term
74xx
Definition
Propagation delay around 10ns
Power consumption of 10mW
Original Family
Term
74Hxx
Definition
High Speed; speed improved, but power consumption increased
Term
CMOS
Definition
Logic family susceptible to ESD
Term
74Lxx
Definition
Low power; power consumption improved, but speed decreased
Term
74Sxx
Definition
Schottky improved speed
Term
74LSxx
Definition
Low power Schottky; good speed and reduced power consumption
Term
74ASxx
Definition
Advanced Schottky; twice as fast as 74Sxx with the same power dissipation
Term
74ALS
Definition
Advanced low power Schottky; lower power consumption and higher speed than 74LSxx
Term
74Fxx
Definition
Fast; performance between 74ASxx and 74ALSxx
Term
SN
Definition
Prefix ID for Texas Instruments
Term
N
or
P
Definition
ID Suffix for "plastic DIP"
Term
J
Definition
ID Suffix for "ceramic DIP"
Term
W
Definition
ID Suffix for "ceramic flat package"
Term
D
Definition
ID Suffix for "plastic small outline package"
Term
40xx
Definition
Original CMOS family; slow but with low power consumption
Term
74HCxx
Definition
High speed CMOS; uses a voltage supply between 2 and 6 volts; higher voltage = higher speed; lower voltage = lower power consumption
Term
74HCTxx
Definition
High speed CMOS; TTL compatible, otherwise same as 74HCxx
Term
74ACxx
Definition
Very fast, but not TTL compatible
Term
74ACTxx
Definition
Advanced CMOS, TTL compatible, otherwise same as 74ACxx
Term
74FCTxx
Definition
Fast CMOS; TTL compatible
Term
MN
Definition
ID Prefix for "Motorola"
Term
DM
Definition
ID Prefix for "National Semiconductor"
Term
N
Definition
ID Prefix for "Signetics"
Term
P
Definition
ID Prefix for "Intel"
Term
H
Definition
ID Prefix for "Harris"
Term
AMD
Definition
ID Prefix for "Advanced Micro Devices"
Term
Fanout
Definition
Maximum number of digital inputs the output of a single logic gate can drive reliably.
Term
10
Definition
Typical fanout for TTL
Term
50
Definition
Typical fanout for CMOS
Term
Inverter
or
NOT gate
Definition
. __
. X = A
Term
AND gate
Definition
All or nothing; Only true on output if ALL input are true
Term
OR gate
Definition
Any or All; Output is true if ALL OR ANY inputs are true
Term
Inverters or "NOT" Gate Symbol
Definition
[image]
Term
Inverters or "NOT" Gate Truth Table
Definition
[image]
Term
"AND" Gate Symbol
Definition
[image]
Term
"AND" Gate Truth Table
Definition
[image]
Term
"NAND" Gate Symbol
Definition
[image]
Term
"NAND" Gate Truth Table
Definition
[image]
Term
"OR" Gate Symbol
Definition
[image]
Term
"OR" Gate Truth Table
Definition
[image]
Term
"NOR" Gate Symbol
Definition
[image]
Term
"NOR" Gate Truth Table
Definition
[image]
Term
"XOR" Gate Symbol
Definition
[image]
Term
"XOR" Gate Truth Table
Definition
[image]
Term
"XNOR" Gate Symbol
Definition
[image]
Term
"XNOR" Gate Truth Table
Definition
[image]
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