User`s guide

Specifyin
g
Di
g
ital Power Supplies 15
-11
Creatin
g
a secondar
y
CD4000, TTL, or ECL power
suppl
y
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
g
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.