h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 812

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 25 Electrical Characteristics
25.3.7
(1) The F-ZTAT and mask ROM versions have been confirmed as fully meeting the reference
(2) On-chip power supply step-down circuit
Rev. 4.00 Jun 06, 2006 page 758 of 1004
REJ09B0301-0400
values for electrical characteristics shown in this manual. However, actual performance
figures, operating margins, noise margins, and other properties may vary due to differences in
the manufacturing process, on-chip ROM, layout patterns, etc.
When system evaluation testing is carried out using the F-ZTAT version, the same evaluation
tests should also be conducted for the mask ROM version when changing over to that version.
The following products incorporate an internal power supply step-down circuit, which
automatically drops down the internal power supply voltage to the optimum internal voltage
level: the F-ZTAT A-mask version of the H8S/2138 (HD64F2138A) and the mask ROM
versions of the H8S/2138 and H8S/2137 (HD6432138S, HD6432138SW, HD6432137S, and
HD6432137SW).
The voltage-stabilization capacitor (0.47 µF one or two connected in series) must be connected
between the VCL (internal power supply step-down) and V
Figure 25.3 shows the connection of the external capacitors.
For the 5- or 4-V version whose power supply (V
VCL pin in a product incorporating an internal step-down circuit to the V
(Connect the VCC1 pin to the V
supply (V
power supply.
When changing from the F-ZTAT versions not incorporating an internal step-down circuit to
the F-ZTAT A-mask versions or mask ROM versions incorporating an internal step-down
circuit, the VCL pin has the same pin location as the VCC2 pin.
Therefore, note that the circuit patterns differ between these two types of products.
Usage Note
CC
) voltage is 3.6 V or lower, connect both the VCL and VCC1 pins to the system
CC
power supply as usual.) For the 3-V version whose power
CC
) voltage exceeds 3.6 V, do not connect the
SS
pins.
CC
power supply.