參數資料
型號: UPD754244
廠商: NEC Corp.
英文描述: 4-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述: 4位單晶片微控制器
文件頁數: 49/88頁
文件大?。?/td> 416K
代理商: UPD754244
49
μ
PD754144, 754244
μ
PD754144
System Clock Oscillator Characteristics (T
A
= –40 to +85
°
C, V
DD
= 1.8 to 6.0 V)
Resonator
Recommended Constant
Parameter
Testing Conditions
MIN.
TYP.
MAX.
Unit
RC
oscillator
Oscillation
frequency (f
cc
)
Note
0.4
2.0
MHz
Note
Only the oscillator characteristics are shown. For the instruction execution time and oscillation frequency
characteristics, refer to
AC Characteristics
.
Caution When using the oscillation circuit of the system clock, wire the portion enclosed in dotted lines
in the figures as follows to avoid adverse influences on the wiring capacitance:
Keep the wire length as short as possible.
Do not cross other signal lines.
Do not route the wiring in the vicinity of lines though which a high fluctuating current flows.
Always keep the ground point of the capacitor of the oscillation circuit as the same potential
as V
SS
.
Do not connect the power source pattern through which a high current flows.
Do not extract signals from the oscillation circuit.
CL1 CL2
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