HP 8559A BASIC LOGIC SYMBOLS, SYMBOLS USED I N SCHEMATIC AND BLOCK DIAGRAMS

SERVICE MODEL 8559A

SYMBOLS USED I N SCHEMATIC AND BLOCK DIAGRAMS

BASIC LOGIC SYMBOLS

Indicator Symbols (positive logic assumed)

EDGE-TRIGGERED (dynamic) inputs R are indicated by the presence of the

dynamic input symbol.

Input is active only on the positive-going transition.

ACTIVE PERIOD

'LInput is active only on the negative- going transition.

ACTIVE PERIOD

ACTIVE-HIGH inputs and outputs are indicated by the absence of the negation symbol, 0 .

ACTIVE PERIOD

ACTIVE-LOW inputs and oututs are indicated by the presence of the negation symbol, 0 .

ACTIVE PERIOD

FIGURE8-1. SYMBOLSUSEDIN SCHEMATICAND BLOCK DIAGRAMS(4 OF 4)