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參數(shù)資料
| 型號： | SG500DYB |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PROC SPECIFIC CLOCK GENERATOR, PDSO28 |
| 封裝： | 0.209 INCH, SSOP-28 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大小： | 92K |
| 代理商： | SG500DYB |
SG500
Low Jitter Spectrum Clock Generator for PowerPC Designs.
Approved Product
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
Rev.2.1
9/18/98
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Page 5 of 7
TB41 BUFFER CHARACTERISTICS FOR CPU, PCI, PCIF, REF and 48M
Characteristic
Symbol
Min
Typ
Max
Units
Conditions
Pull-Up Current Min
IOHmin
30
-
39
mA
Vout = Vdd - 0.5V
Pull-Up Current Max
IOHmax
75
-
109
mA
Vout = 1.5V
Pull-Down Current Min
IOLmin
30
-
40
mA
Vout = 0.4V
Pull-Down Current Max
IOLmax
75
-
103
mA
Vout = 1.2V
Rise/Fall Time Min
Between 0.4 V and 2.4 V
TRFmin
0.5
-
nS
15 pF Load
Rise/Fall Time Max
Between 0.4 V and 2.4 V
TRFmax
-
2.0
nS
30 pF Load
VDD = VDDP = VDDPF = VDDF = VDDR =3.15 - 3.45 V , TA = 0C to +70C
CRYSTAL AND REFERENCE OSCILLATOR PARAMETERS
Characteristic
Symbol
Min
Typ
Max
Units
Conditions
Frequency
Fo
12.00
14.31818
16.00
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
36
pF
Capacitance of XIN and Xout pins to
ground (each)
DC Bias Voltage
VBIAS
0.3Vdd
Vdd/2
0.7Vdd
V
Startup time
Ts
-
30
S
Load Capacitance
CL
-
20
-
pF
The crystals rated load. note 1
Effective Series
resistance (ESR)
R1
-
40
Ohms
Power Dissipation
DL
-
0.10
mW
note 1
Shunt Capacitance
CO
-
--
8
pF
crystals internal package
capacitance (total)
For maximum accuracy, the total circuit loading capacitance should be equal to CL. This loading capacitance is the
effective capacitance across the crystal pins and includes the device pin capacitance (CP) in parallel with any circuit
traces, the clock generator and any onboard 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 36 pF, Load to the crystal is therefore
=
18.0 pF
the total parasitic capacitance would therefore be
=
20.0 pF.
Note 1: It is recommended but not mandatory that a crystal meets these specifications.
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