参数资料
型号: ST72C334N4B3XXX
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, PDIP56
封装: 0.600 INCH, PLASTIC, SDIP-56
文件页数: 21/153页
文件大小: 2235K
代理商: ST72C334N4B3XXX
ST72334J/N, ST72314J/N, ST72124J
117/153
CLOCK AND TIMING CHARACTERISTICS (Cont’d)
16.5.3 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 components. 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...).
16.5.3.1 Typical Crystal Resonators
Figure 68. Application with a Crystal Resonator
Notes:
1. Resonator characteristics given by the crystal 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 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
Recommended load capacitance 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
110
180
400
100
190
360
700
A
Option
Byte
Config.
Reference
Freq.
Characteristic 1)
CL1
[pF]
CL2
[pF]
tSU(osc)
[ms] 2)
LP
JA
UCH
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
OSC2
OSC1
fOSC
CL1
CL2
i2
RF
ST72XXX
RESONATOR
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