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参数资料
型号： ST72C171K2B6
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32
封装： SHRINK, PLASTIC, DIP-32
文件页数： 25/152页
文件大小： 2156K
代理商： ST72C171K2B6
ST72C171
120/152
CLOCK AND TIMING CHARACTERISTICS (Cont’d)
9.5.3 Crystal and Ceramic Resonator Oscillators
The ST7 internal clock can be supplied with four
different Crystal/Ceramic resonator oscillators. All
the information given in this paragraph are based
on characterization results with specified typical
external componants. In the application, the reso-
nator and the load capacitors have to be placed as
close as possible to the oscillator pins in order to
minimize output distortion and start-up stabiliza-
tion time. Refer to the crystal/ceramic resonator
manufacturer for more details (frequency, pack-
age, accuracy...).
Figure 68. Typical Application with a Crystal or Ceramic Resonator
Notes:
1. Resonator characteristics given by the crystal/ceramic resonator manufacturer.
2. tSU(OSC) is the typical oscillator start-up time measured between VDD=2.8V and the fetch of the first instruction (with a
quick VDD ramp-up from 0 to 5V (<50s).
3. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small RS value.
Refer to crystal/ceramic resonator manufacturer for more details.
Symbol
Parameter
Conditions
Min
Max
Unit
fOSC
Oscillator Frequency 3)
LP: Low power oscillator
MP: Medium power oscillator
MS: Medium speed oscillator
HS: High speed oscillator
1
>2
>4
>8
2
4
8
16
MHz
RF
Feedback resistor
20
40
k
CL1
CL2
Recommanded load capacitances ver-
sus equivalent serial resistance of the
crystal or ceramic resonator (RS)
RS=200
LP oscillator
RS=200
MP oscillator
RS=200
MS oscillator
RS=100
HS oscillator
38
32
18
15
56
46
26
21
pF
i2
OSC2 driving current
VDD=5V
LP oscillator
VIN=VSS
MP oscillator
MS oscillator
HS oscillator
40
50
100
250
130
300
550
820
A
Oscil.
Typical Crystal or Ceramic Resonators
CL1
[pF]
CL2
[pF]
tSU(osc)
[ms] 2)
Reference
Freq.
Characteristic 1)
Cr
ys
ta
l
LP
JA
UC
H
S-200-30-30/50
2MHz
f
OSC=[±30ppm25°C,±30ppm
Ta], Typ. RS=200
33
34
10~15
MP
SS3-400-30-30/30
4MHz
f
OSC=[±30ppm25°C,±30ppm
Ta], Typ. RS=60
33
34
7~10
MS
SS3-800-30-30/30
8MHz
f
OSC=[±30ppm25°C,±30ppm
Ta], Typ. RS=25
33
34
2.5~3
HS
SS3-1600-30-30/30
16MHz
f
OSC=[±30ppm25°C,±30ppm
Ta], Typ. RS=15
33
34
1~1.5
Ce
ram
ic
LP
MUR
A
T
A
CSA2.00MG
2MHz
f
OSC=[±0.5%tolerance,±0.3%
Ta,±0.3%aging,±x.x%correl]33
30
4.2
MP
CSA4.00MG
4MHz
f
OSC=[±0.5%tolerance,±0.3%
Ta,±0.3%aging,±x.x%correl]33
30
2.1
MS
CSA8.00MTZ
8MHz
f
OSC=[±0.5%tolerance,±0.5%
Ta,±0.3%aging,±x.x%correl]33
30
1.1
HS
CSA16.00MXZ040
16MHz
f
OSC=[±0.5%tolerance,±0.3%
Ta,±0.3%aging,±x.x%correl]33
30
0.7
OSC2
OSC1
fOSC
CL1
CL2
i2
RF
ST72XXX
RESONATOR
WHEN RESONATOR WITH
INTEGRATED CAPACITORS
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相关代理商/技术参数
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