U18680EJ1V0PM00_15 Datasheet, PDF (14/30 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCONTROLLER

µPD78F9221CS, 78F9222CS
X1 Oscillator Characteristics (TA = −40 to +85°C, VDD = 2.0 to 5.5 V^{Note 1}, VSS = 0 V)
Resonator Recommended Circuit Parameter
Conditions
Ceramic
resonator
VSS X1 X2
Oscillation
frequency (fX)^{Note 2}
MIN.
2.0
TYP.
MAX.
10.0
Unit
MHz
C1 C2
Crystal
resonator
VSS X1 X2
C1 C2
Oscillation
frequency (fX)^{Note 2}
2.0
10.0 MHz
External
clock
X1 input
2.7 V ≤ VDD ≤ 5.5 V
X1
frequency (fX)^{Note 2}
2.0 V ≤ VDD < 2.7 V
X1 input high-
/low-level width
(tXH, tXL)
2.7 V ≤ VDD ≤ 5.5 V
2.0 V ≤ VDD < 2.7 V
2.0
2.0
0.045
0.09
10.0 MHz
5.0
0.25 µs
0.25
Notes 1.
2.
Use this product in a voltage range of 2.2 to 5.5 V because the detection voltage (VPOC) of the power-on-
clear (POC) circuit is 2.1 V ±0.1 V.
Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.
Caution When using the X1 oscillator, wire as follows in the area enclosed by the broken lines in the above
figures to avoid an adverse effect from wiring capacitance.
• Keep the wiring length as short as possible.
• Do not cross the wiring with the other signal lines.
• Do not route the wiring near a signal line through which a high fluctuating current flows.
• Always make the ground point of the oscillator capacitor the same potential as VSS.
• Do not ground the capacitor to a ground pattern through which a high current flows.
• Do not fetch signals from the oscillator.
Remark For the resonator selection and oscillator constant, users are required to either evaluate the oscillation
themselves or apply to the resonator manufacturer for evaluation.
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Preliminary Product Information U18680EJ1V0PM00