User Guide

Device-Editor:54*1032A.dev
8.3 SupplyVoltages
ComponentPowerSupplyPins
The components’ supply pins are to be given the direction Pwr in the
symbol definition. The pin name determines the name of the supply sig
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nal. Pins whose direction is Pwr and which have the same name are
automatically wired together (even when no net line is shown explic
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itly). Whether the pins are visible in the schematic diagram or are
fetchedbymeansofahiddensymbolisalsonotrelevant.
Invisible SupplyPins
We do not want as a rule to draw the supply connections for logic com
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ponents or operational amplifiers in the schematic. In such a case a spe
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cific symbol containing the supply connections is defined. This can be
demonstratedwiththeexampleofa7400TTLcomponent:
You first define a NAND gate with the name 7400, and the following
propertiesintheSymbolEditor:
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ComponentDesignExplainedthroughExamples