PD17225_15 Datasheet, PDF (69/86 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER

µPD17225, 17226, 17227, 17228
System Clock Oscillator Characteristics (TA = –40 to +85°C, VDD = 2.0 to 3.6 V)
Resonator
Ceramic
resonator
Recommended
Constants
X IN
X OUT
Item
Oscillation frequency
(fX)^{Note 1}
Conditions
MIN. TYP. MAX. Unit
1.0 4.0 8.0 MHz
Oscillation
stabilization time^{Note 2}
After VDD reached MIN.
in oscillation voltage
range
4
ms
Notes 1. The oscillation frequency only indicates the oscillator characteristics.
2. The oscillation stabilization time is necessary for oscillation to be stabilized, after VDD application or
STOP mode release.
Caution To use a system clock oscillator circuit, perform the wiring in the area enclosed by the dotted
line in the above figure as follows, to avoid adverse wiring capacitance influences:
• Keep wiring length as short as possible.
• Do not cross a signal line with some other signal lines. Do not route the wiring in the vicinity
of lines through which a large current flows.
• Always keep the oscillator circuit capacitor ground at the same potential as GND. Do not
ground the capacitor to a ground pattern, through which a large current flows.
• Do not extract signals from the oscillator circuit.
External circuit example
XIN
XOUT
R1
C1
C2
Data Sheet U12643EJ2V0DS00
67