Datasheet
CHAPTER 19 ELECTRICAL SPECIFICATIONS
User’s Manual U18172EJ3V0UD
295
X1 Oscillator Characteristics
(1)
μ
PD78F920x (TA = −40 to +85°C, VDD = 2.0 to 5.5 V
Note 1
, VSS = 0 V)
Resonator Recommended Circuit Parameter Conditions MIN. TYP. MAX. Unit
Ceramic
resonator
X2X1V
SS
C2C1
Oscillation
frequency (f
X)
Note 2
2.0 10.0 MHz
Crystal
resonator
X2X1V
SS
C2C1
Oscillation
frequency (f
X)
Note 2
2.0 10.0 MHz
2.7 V ≤ VDD ≤ 5.5 V 2.0 10.0
X1 input
frequency (f
X)
Note 2
2.0 V ≤ V
DD < 2.7 V 2.0 5.0
MHz
2.7 V ≤ VDD ≤ 5.5 V 0.045 0.25
External
clock
X1
X1 input high-
/low-level width
(t
XH, tXL)
2.0 V ≤ V
DD < 2.7 V 0.09 0.25
μ
s
Notes 1. 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.
2. 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 V
SS.
• 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.
(2)
μ
PD78F950x (TA = −40 to +85°C, VDD = 2.0 to 5.5 V
Note 1
, VSS = 0 V)
Resonator Recommended Circuit Parameter Conditions MIN. TYP. MAX. Unit
2.7 V ≤ VDD ≤ 5.5 V 2.0 10.0
External main system clock
frequency (f
EXCLK)
Note 2
2.0 V ≤ V
DD < 2.7 V 2.0 5.0
MHz
2.7 V ≤ VDD ≤ 5.5 V 0.045 0.25
External
clock
EXCLK
External main system clock
input high-/low-level width
(t
EXCLKH, tEXCLKL)
2.0 V ≤ V
DD < 2.7 V 0.09 0.25
μ
s
Notes 1. 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.
2. Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.
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