C9577
Low EMI Clock Generator/Buffers for Pentium® II Systems
Preliminary
CRYSTAL AND REFERENCE OSCILLATOR PARAMETERS
Characteristic
Symbol
Min
Typ
Max
Units
Conditions
Frequency
Tolerance
Fo
TC
TS
TA
12.00
14.31818
16.00
+/-100
+/- 100
5
MHz
PPM
PPM
PPM
-
-
-
-
-
-
-
Calibration note 1
Stability (Ta -10 to +60C) note 1
Aging (first year @ 25C) note 1
Parallel Resonant
Mode
OM
CP
-
-
Pin Capacitance
36
pF
Capacitance of XIN and Xout pins to
ground (each)
DC Bias Voltage
Startup time
VBIAS
Ts
0.3Vdd
Vdd/2
0.7Vdd
V
µS
-
-
-
-
20
-
30
-
Load Capacitance
CL
pF
The crystals rated load. note 1
note 1
Effective Series
resistance (ESR)
R1
40
Ohms
Power Dissipation
Shunt Capacitance
DL
-
-
-
0.10
8
mW
pF
crystals internal package capacitance
(total)
CO
--
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
Clock generator internal pin capacitance of 32 pF, Load to the crystal is therefore
The total parasitic capacitance would therefore be
=
=
=
2.0 pF
18.0 pF
20.0 pF.
Note 1: It is recommended but not mandatory that a crystal meets these specifications.
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571
Rev 1.5
4/22/1999
Page 8 of 10
CYPRESS [ CYPRESS ]
