參數(shù)資料
型號(hào)： SST89V554RC-25-C-NI
廠商： Silicon Storage Technology, Inc.
英文描述： FlashFlex51 MCU
中文描述： FlashFlex51單片機(jī)
文件頁(yè)數(shù)： 50/62頁(yè)
文件大?。?/td> 680K
代理商： SST89V554RC-25-C-NI
50
Preliminary Specifications
FlashFlex51 MCU
SST89E564RD / SST89V564RD / SST89E554RC / SST89V554RC
2001 Silicon Storage Technology, Inc.
S71207-00-000
9/01
555
10.6 Clock Input Options
Shown in Figure 10-2 are the input and output of an inter-
nal inverting amplifier (XTAL1, XTAL2), which can be con-
figured for use as an on-chip oscillator.
When driving the device from an external clock source,
XTAL2 should be left disconnected and XTAL1 should be
driven.
At start-up, the external oscillator may encounter a higher
capacitive load at XTAL1 due to interaction between the
amplifier and its feedback capacitance. However, the
capacitance will not exceed 15 pF once the external signal
meets the V
IL
and V
IH
specifications.
10.7 Recommended Capacitor Values for
Crystal Oscillator
Crystal manufacturer, supply voltage, and other factors
may cause circuit performance to differ from one applica-
tion to another. C1 and C2 should be adjusted appropri-
ately for each design. The table below, shows the typical
values for C1 and C2 at a given frequency. If following the
satisfactory selection of all external components, the circuit
is still over driven, a series resistor, Rs, may be added.
More specific information about on-chip oscillator design
can be found in
FlashFlex 51 Oscillator Circuit Design Con-
siderations
Application Note.
FIGURE
10-2: O
SCILLATOR
C
HARACTERISTICS
R
ECOMMENDED
VALUES
FOR
CRYSTAL
OSCILLATOR
Frequency
< 8MHz
8-12MHz
>12MHz
C1 and C2
90-110pF
18-22pF
18-22pF
R
S
(Optional)
100
200
200
555 ILL F21.0
XTAL2
XTAL1
Vss
C1
Using the On-Chip Oscillator
External Clock Drive
C2
RS
XTAL2
XTAL1
Vss
EXTERNAL
OSCILLATOR
SIGNAL
NC
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SST89V554RC-25-C-NJ 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU
SST89V554RC-25-C-PI 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU
SST89V554RC-25-C-PJ 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU
SST89V554RC-25-C-TQI 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU
SST89V554RC-25-C-TQJ 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU
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