參數(shù)資料
型號(hào)： 7544
英文描述： 3.3V LDO POSITVE VOLTAGE REGULATOR 2% TOL.
中文描述： 7544Group數(shù)據(jù)表數(shù)據(jù)表503K/JUN.25.03
文件頁(yè)數(shù)： 33/54頁(yè)
文件大?。?/td> 503K
代理商： 7544
Rev.1.02 2003.06.25 page 33 of 53
7544 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
Fig. 39 External circuit of ceramic resonator and quartz-crystal
oscillator
Fig. 41 External clock input circuit
Fig. 38 Processing of X
IN
and X
OUT
pins at ring oscillator operation
Clock Generating Circuit
An oscillation circuit can be formed by connecting a resonator be-
tween X
IN
and X
OUT
, and an RC oscillation circuit can be formed
by connecting a resistor and a capacitor.
Use the circuit constants in accordance with the resonator
manufacturer's recommended values.
(1) Ring oscillator operation
When the MCU operates by the ring oscillator for the main clock,
connect X
IN
pin to V
CC
and leave X
OUT
pin open.
The clock frequency of the ring oscillator depends on the supply
voltage and the operation temperature range.
Be careful that variable frequencies when designing application
products.
(2) Ceramic resonator and quartz-crystal oscillator
When the ceramic resonator and quartz-crystal oscillator is used
for the main clock, connect the ceramic/quartz-crystal oscillator
and the external circuit to pins X
IN
and X
OUT
at the shortest dis-
tance. A feedback resistor is built in between pins X
IN
and X
OUT
.
(3) RC oscillation
When the RC oscillation is used for the main clock, connect the
X
IN
pin and X
OUT
pin to the external circuit of resistor R and the
capacitor C at the shortest distance.
The frequency is affected by a capacitor, a resistor and a micro-
computer.
So, set the constants within the range of the frequency limits.
(4) External clock
When the external signal clock is used for the main clock, connect
the X
IN
pin to the clock source and leave X
OUT
pin open.
Externally connect a
damping resistor Rd
depending on the oscil-
lation frequency.
(A feedback resistor is
built-in.)
Use the resonator
manufacturer
’
s recom-
mended value because
constants such as ca-
pacitance depend on
the resonator.
Note:
Connect the external
circuit of resistor R
and the capacitor C at
the shortest distance.
The frequency is af-
fected by a capacitor,
a resistor and a micro-
computer.
So, set the constants
within the range of the
frequency limits.
Note:
The clock frequency of the
ring oscillator depends on
the supply voltage and the
operation temperature
range.
Be careful that variable fre-
quencies and obtain the
sufficient margin.
Note:
X
IN
X
OUT
M37544
Open
X
IN
C
OUT
C
IN
X
OUT
M37544
Rd
X
IN
X
OUT
C
R
M37544
X
IN
X
OUT
External oscillation
circuit
V
CC
V
SS
Open
M37544
Fig. 40 External circuit of RC oscillation
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