Module 1: Digital Number Sys and Combo Logic Flashcards
What are the 2 distint characteristics of a number system?
base/radix symbols
The base is always 1 ______ than the largest symbol
greater
What is decimal 56 in binary?
0011 1000
What is the basis of digital data?
Binary numbers
The digits of a binary number are called what?
Bits
Standard grouping of a binary number is a group of how many?
4 bits
What is a nibble?
4 bits
How many nibbles make a byte?
2 nibbles
2 or 4 bytes make what?
WOrd
A longword consists of what?
2 words
Interpret these state/logic levels
Output Low = 0V to 0.4V
Output High = 2.7V to 5V
Input Low = 0V to 0.8V
Input High = 2V to 5V
Convert 110101 to Decimal
53
Convert decimal 48 to binary
110000
11011 + 11
11110
101100 - 111
100101
11001 x 10
110010
11001 divide by 10
1100
What are the 2 categories of digital circuits?
Combinational
Sequential
What is combinational logic determined by?
Determined by its present inputs
Sequential logic output depends on what?
present inputs
previous sequences
clock pulse
Logic gate are an example of what?
Combinational circuits
Flip flops and Multivibrators are an example of what?
Sequential circuits
What are the basic logic gates and their derivitives?
AND (multiply)
OR (add)
NOT (inverse)
NAND
NOR
XOR
XNOR
Buffer
What are the 3 boolean algebra logical operations?
Addition (OR)
Multiplication (AND)
Complementation (NOT)
What logic gate is this photo showing?
Explain what is happening
NOT gate
if A is low, no path to ground which means no V drop if no current through resistance. comes out at output with a high
What gate is being showed here?
AND gate
What gate is being shown here?
OR gate (add)
What gate is being shown here?
NAND gate
What gate is being shown here?
NOR gate
What are the uses of a non inverter?
Provide sufficient current to drive a number of gates
Interface between 2 logic families
Obtaining a desired pulse rise time
Provide slight delay to ensure pulses arrive at proper time
