Datasheet

Section 26 Electrical Characteristics
Rev. 4.00 Sep 27, 2006 page 801 of 1130
REJ09B0327-0400
External capacitor for
stabilizing power supply
By-pass
capacitor
Product not
incorporating
step-down
circuit
Product
incorporating
internal
step-down
circuit
VCL
VSS
VCC2
V
CC
power supply
VSS
0.47 µF
one or two
connected
in group
10 µF 0.01 µF
For products incorporating an internal step-down
circuit, do not connect the VCL pin to the VCC
power supply. (The VCC1 pin must be connected
to the VCC power supply as usual.)
The power supply stabilization capacitor must be
connected to the VCL pin. Use a monolithic
ceramic capacitor of 0.47 µF(one or two
connected in group) and locate it near the pins.
In case the power supply voltage is lower than
3.6 V, connect the capacitor in the same way as
the case with no step-down circuit incorporated.
<Products incorporating internal step-down
circuit>
HD6432148S, HD6432148SW,
HD6432147S, HD6432147SW
HD6432144S, HD6432143S,
HD64F2148A, HD64F2147A,
HD64F2144A
The location of the VCC2 (V
CC
power supply)
pin in the product not incorporating an internal
step-down circuit, is the same as the VCL pin in
a product incorporating an internal step-down
circuit.
It is recommended that the by-pass capacitors
are connected to the power supply terminal
(these are reference values).
<Products not incorporating internal step-down
circuit>
HD64F2148(V), HD64F2147N(V),
HD64F2144(V), HD64F2142(V),
HD6432142,
HD6432148SV, HD6432148SVW,
HD6432147SV, HD6432147SVW,
HD6432144SV, HD6432143SV,
HD64F2148AV, HD64F2147AV,
HD64F2144AV
Figure 26.3 Connection of External Capacitor (Mask ROM Type Incorporating Step-Down
Circuit and Product Not Incorporating Step-Down Circuit)