Datasheet

Section 27 Electrical Characteristics
Rev. 3.00 Mar 21, 2006 page 761 of 788
REJ09B0300-0300
External capacitor for
power supply regulation
0.47 µF
(one,
or two
in parallel)
VCL
Product with internal
step-down function
VCL
Product without
internal step-down function
Vcc power supply
VSS VSS
0.01 µF
Bypass
capacitor
10 µF
The VCC power supply should not be connected to the
VCL pin of the product with the internal step-down
function. (Connect the VCC power supply to other
VCC1 pins as usual.)
Be sure to connect power supply regulating capacitor(s)
to the VCL pin. One or two (parallel) 0.47-µF
multilayer capacitors should be used near the VCL pin.
For 3-V products used with the voltage of 3.6 V or less,
connect the Vcc power supply in the same way as the
products without the internal step-down function.
< Product with internal step-down function >
HD64F2145B
HD64F2148B
The VCC2 pin of the product without the internal step-down
function is allocated at the same location as the VCL pin of
the product with the internal step-down function.
It is recommended that a bypass capacitor be connected to
the power supply pins. (The values are reference values.)
< Product without internal step-down function >
HD64F2145BV
HD64F2148BV
Figure 27.5 Connection of VCL Capacitor