UPD78361A Datasheet, PDF (67/88 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLER

µPD78361A, 78362A
Oscillator Characteristics (TA = –40 to +85 ˚C, VDD = +5 V ± 10 %, VSS = 0 V)
Resonator
Ceramic resonator or
crystal resonator
Recommended circuit
VSS X1
X2
Parameter
Oscillation frequency (fXX)
MIN.
3
MAX.
8
Unit
MHz
C1 C2
External clock
X1
X2
Leave unconnected
HCMOS
inverter
X1 input frequency (fX)
X1 rise/fall time (tXR, tXF)
X1 input high-/low-level
width (tWXH, tWXL)
3
8
MHz
0
30
ns
40
170
ns
Caution When using system clock oscillation circuits, to reduce the effect of the wiring
capacitouce, etc, wire the area indicated by dotted-line as follows:
• Make the wiring as short as possible.
• Do not allow the wiring to intersect other signal lines. Keep it away from other lines in which
varying high currents flow.
• Make sure that the ground point of the oscillation circuit capacitor is always at the same
electric potential as VSS. Do not allow the wiring to be grounded to a ground pattern in which
very high currents are flowing.
• Do not extract signals from the oscillation circuit.
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