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(c) 2010. Renesas Electronics Corporation. All rights reserved. Page 1 of 1
Date: Jun. 21, 2010
RENESAS TECHNICAL UPDATE
1753, Shimonumabe, Nakahara-ku, Kawasaki-shi, Kanagawa 211-8668 Japan
Renesas Electronics Corporation
Product
Category
MPU/MCU
Document
No.
TN-16C-A187A/E
Rev.
1.00
Title
M16C/62P Group, M16C/6K Group, M16C/6N Group,
M16C/30P Group, M16C/29 Group, M16C/28 Group,
M16C/26A Group, M16C/64 Group
Note on Supply Voltage Fluctuation
Information
Category
Technical Notification
Lot No.
Applicable
Product
See below
Reference
Document
When developing MCU application products, the customer should take care with events like power supply noise in their
product and/or environment. The following is a general note pertaining to supply voltage variations due to events like power
supply noise.
1. Applicable products
M16C/62P Group, M16C/6K Group (M306K9FCLRP, M306KAFCLRP), M16C/6N Group,
M16C/30P Group, M16C/29 Group, M16C/28 Group, M16C/26A Group, M16C/64 Group
2. Note
After reset is deasserted, the supply voltage applied to the VCC pin
(1)
must meet either or both the allowable ripple voltage
V
r(VCC)
or ripple voltage falling gradient dV
r(VCC)
/dt shown in the figure below.
Note 1: VCC1 pin in the M16C/62P Group, M16C/6N Group, M16C/30P Group, and M16C/64 Group.
Standard
Symbol Parameter
Min. Typ. Max.
Unit
V
r(VCC)
Allowable ripple voltage 0.1Vcc V
A 10 V/ms
dV
r(VCC)
/dt Ripple voltage falling gradient
B 0.3 V/ms
A: M16C/62P Group, M16C/6K Group (M306K9FCLRP, M306KAFCLRP), M16C/6N Group,
M16C/30P Group, M16C/29 Group, M16C/28 Group, M16C/26A Group
B: M16C/64 Group
To prevent operation error due to noise, connect a bypass capacitor (approximately 0.1 μF) across pins VCC and VSS
(2)
using the shortest and thickest possible wiring.
Note 2: Across pins VCC1 and VSS, and pins VCC2 and VSS in the M16C/62P Group, M16C/6N Group, M16C/30P
Group, and M16C/64 Group.
VCC
Vr(VCC)
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Pagina 1 - RENESAS TECHNICAL UPDATE

(c) 2010. Renesas Electronics Corporation. All rights reserved. Page 1 of 1 Date: Jun. 21, 2010RENESAS TECHNICAL UPDATE 1753,

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