參數(shù)資料
型號(hào)： UPD78045H
廠商： NEC Corp.
元件分類： DC/DC變換器
英文描述： 1 watt dc-dc converters
中文描述： 1瓦的DC - DC轉(zhuǎn)換器
文件頁(yè)數(shù)： 38/58頁(yè)
文件大?。?/td> 552K
代理商： UPD78045H
38
μ
PD78044H, 78045H, 78046H
SUBSYSTEM CLOCK OSCILLATOR CHARACTERISTICS
(T
A
= –40 to +85
°
C, V
DD
= 2.7 to 5.5 V)
Notes 1.
It indicates only the oscillator characteristics. For the instruction execution time, see the AC Charac-
teristics.
2.
Time required until oscillation becomes stable after V
DD
reaching MIN. of oscillation voltage range.
Cautions 1. If the subsystem clock oscillator is to be used, wire the area inside the broken line square as
follows to avoid influence of wiring capacitance:
Make wiring as short as possible.
Do not cross other signal lines.
Do not get close to lines with fluctuating large current.
Make sure that the connecting points of the capacitor of the oscillator always have the same
electric potential as V
SS
.
Do not connect the oscillator to a ground pattern that conducts a large current.
Do not take out signal from the oscillator.
2. The subsystem clock oscillator is more likely to have malfunctions due to noise than the main
system clock oscillator because gain for the subsystem clock oscillator is made lower to
reduce current consumption. When using the subsystem clock, be careful about how to
connect wires.
XT1
XT2
Resonator
Recommended circuit
Parameter
Conditions
MIN.
TYP.
MAX.
Unit
Crystal
Oscillation frequency
(f
XT
)
Note 1
32
32.768
35
kHz
Oscillation settling
time
Note 2
V
DD
= 4.5 to 5.5 V
1.2
2
s
10
External
XT1 input frequency
(f
XT
)
Note 1
32
100
kHz
XT1 input high, low-
level width (t
XTH
, t
XTL
)
5
15
μ
s
XT1
XT2
C4
C3
V
SS
R
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