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参数资料
| 型号： | SC309AZB |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 49.152 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO8 |
| 封装： | SOIC-8 |
| 文件页数： | 4/5页 |
| 文件大小： | 186K |
| 代理商： | SC309AZB |
SC309
Low Cost Clock Generator for Advanced SCSI and Audio Applications.
Approved Product
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
Rev.1.7
7/20/98
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Page 4 of 5
CRYSTAL AND REFERENCE OSCILLATOR PARAMETERS
Characteristic
Symbol
Min
Typ
Max
Units
Conditions
Frequency
Fo
-
31.3344
-
MHz
Tolerance
TC
-
+/-100
PPM
Calibration note 1
TS
-
+/- 100
PPM
Stability (Ta -10 to +60C) note 1
TA
-
5
PPM
Aging (first year @ 25C) note 1
Mode
OM
-
Parallel Resonant
Pin Capacitance
CP
-
16
-
pF
Capacitance of XIN and Xout pins to
ground (each) See Note below.
DC Bias Voltage
VBIAS
0.3Vdd
Vdd/2
0.7Vdd
V
Load Capacitance
CL
-
20
-
pF
the crystals rated load. note 1
Effective Series
resistance (ESR)
R1
-
40
Ohms
Shunt Capacitance
CO
-
--
8
pF
crystals internal package
capacitance (total)
NOTE: For maximum accuracy, the total circuit loading capacitance should be equal to CL. This capacitance is the
capacitance across the crystal pins and includes the device pin capacitance, circuit traces and discrete load capacitors.
Budgeting Calculations
Typical trace capacitance, (< half inch) is 4 pF, Load to the crystal is therefore
=
2.0 pF.
Clock generator internal pin capacitance of 16 pF, Load to the crystal is therefore = 8.0 pF.
the total parasitic capacitance would therefore be
= 10.0 pF.
Note 1: It is recommended but not mandatory that a crystal meet these specifications.
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