
Specifyin
Di
ital Power Supplies 15
-11
Creatin
a secondar
CD4000, TTL, or ECL power
suppl
Circuits using CD4000, TTL, or ECL parts may require power
supply voltages in addition to the default 5.0 volts supplied by
the standard CD4000_PWR power supply part.
To create a secondary power supply for any one of the CD4000,
TTL, or ECL technologies, you must place the appropriate
power supply part and create user-defined nodes with a new
voltage value.
For example, to create and use a secondary CD4000 power
supply with nodes MY_VDD and MY_VSS and a voltage of 3.5
volts, you would perform these steps:
1
Place the CD4000_PWR power supply and modify its
attributes as follows:
VOLTAGE = 3.5V
IPIN(VDD) = MY_VDD
IPIN(VSS) = MY_VSS
2
Select a CD4000 part in the schematic to which the new
power supply should apply and change its attributes as
follows:
IPIN(VDD) = MY_VDD
IPIN(VSS) = MY_VSS
Desi
ns with TTL and ECL parts
rarely require secondary power
supplies. If needed, however,
you can use this procedure to
add a secondary power supply
for TTL and ECL parts.
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