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A small circle a[ a clock input ".eans that the out:puts change on
the HIGH Co LOW clc)ck transition.
A small circle a[ an output indicates that when the functic)n de-
signated is true
the c)iitpuc is LOW.
Inputs and outputs are labelled v.'ith mnemonic letters as described
in
table
8.6.1.
8.6.2.
Logic
Functions:
Logic functions are labelled with [memonic letters in a bracket.
An active LOW function is given a bar over the label.
More logic functions may be comected by means cif the principles
of Boolean Algebra.
8.6.3.
Arrows:
A black arrow on a liTie indicates in which direction an AC-signal
f lows ,
A white arrow on a liTie indicates in which direction the information
of a DC signal flows. An exception from this rule is the supply
lines and their connections, which are always indicated by a
supply voltage level or its associated label.
Pc)sicive supply line:
Example
Negative supply liTte:
Example
Connections to supply line:
Example
8-2
I
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