MODEL 8559A

SERVICE

SYMBOLS USED IN SCHEMATIC AND BLOCK DIAGRAMSBASIC LOGIC SYMBOLS

Distinctive-Shape Symbols

Output is active when input is active.

SCHMITT

Output changes abruptly as a fixed DC

TRIGGER

level is crossed by the input signal.

AN D FUNCTION

Output is active only when all inputs are

 

active.

OR FUNCTION

Output is active when one or more in-

 

puts are active.

EXCLUSIVE-OR

Output is active when only one input is

FUNCTION

active.

WIRED AN DTwo or more elements are joined

FUNCTIONtogether t o achieve the effect of an AND function.

WIRED OR

Two or more elements are joined

FUNCTION

together to achieve the effect of an OR

 

function.

FIGURE8-1.SYMBOLS USEDIN SCHEMATICAND BLOCK DIAGRAMS(3OF 4)