UPD75218 NEC, UPD75218 Datasheet - Page 44

• Manufacturer Part Number: UPD75218
• Description: 4-BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC

44
CHARACTERISTICS OF THE MAIN SYSTEM CLOCK OSCILLATOR (T
Notes 1. The oscillator frequency and input frequency indicate only the oscillator characteristics. See the item
Caution When the main system clock oscillator is used, conform to the following guidelines when wiring at the
Resonator
Ceramic
resonator
Note 3
Crystal
resonator
Note 3
External
clock
2. The oscillation settling time means the time required for the oscillation to settle after V
3. See "Recommended Parameters for the Oscillation Circuit" for the resonators.
portions surrounded by dotted lines in the figures above to eliminate the influence of the wiring capacity.
• The wiring must be as short as possible.
• Other signal lines must not run in these areas. Any line carrying a high fluctuating current must be
• The grounding point of the capacitor of the oscillator must have the same potential as that of V
• No signal must be taken from the oscillator.
of AC characteristics for the instruction execution time.
of the oscillation voltage range or after the STOP mode is released.
kept away as far as possible.
must not be grounded to ground patterns carrying a large current.
C1
C1
X1
Recommended
constants
X1
X1
PD74HCU04
X2
X2
X2
C2
C2
Oscillator
frequency
(f
Oscillation
settling time
Note 2
Oscillator
frequency
(f
Oscillation
settling time
Note 2
X1 input
frequency
(f
X1 input
high/low
level width
(t
XX
XX
X
XH
Parameter
)
)
)
, t
Note 1
Note 1
Note 1
XL
)
V
voltage range
After V
Min. of the oscilla-
tion voltage range
V
DD
DD
= Oscillation
= 4.5 to 6.0 V
Conditions
DD
reaches
a
= -40 to +85 C, V
Min.
100
2.0
2.0
2.0
Typ.
4.19
DD
= 2.7 to 6.0 V)
Max.
250
6.2
6.2
6.2
10
30
4
DD
reaches Min.
PD75218
MHz
MHz
MHz
Unit
ms
ms
ms
ns
DD
. It