VCC6-Q Series
3.3 volt LVPECL Crystal Oscillator, Output Frequencies > 270MHz
Features
•
3.3V LVPECL
•
Output frequencies from 270 to 800 MHz
•
Enable/Disable for test and board debug
•
-10/70 or –40/85
°C
operating temperature
•
Hermetically sealed ceramic SMD package
•
Product is compliant to RoHS directive
and fully compatible with lead free assembly
Applications
The VCC6 Crystal Oscillator
•
SONET/SDH/DWDM
•
Fiber Channel
•
Ethernet, Gigabit Ethernet
•
Storage Area Network
•
Digital Video
•
Broadband Access
Enable/Disable
Description
OUT
OUT
Output
Buffer /
Disable
Vectron’s VCC6 Crystal Oscillator (XO) is quartz
stabilized square wave generator with a LV-PECL
output, operating off a 3.3 volt supply.
Vectron International 267 Lowell Road, Hudson NH 03051
Tel: 1-88-VECTRON-1
e-mail: vectron@vectron.com
VCC6-Q 3.3v LVPECL Crystal Oscillator, Output Frequencies > 270MHZ
Performance Characteristics
Table 1. Electrical Performance
Parameter
Frequency
Supply Voltage
1
,
Supply Current
Output Logic Levels, -10/70°C
Output Logic High
2
Output Logic Low
2
Output Logic Levels, -40/85°C
Output Logic High
2
Output Logic Low
2
Transition Times
Rise Time
2
Fall Time
2
Symmetry or Duty Cycle
3
Operating temperature (ordering
option)
Stability (ordering
option)
4
Jitter, 12kHz to 20MHz
5
Period RMS Jitter
Period p/p Jitter
Output Enabled
6
Output Disabled
6
Enable/Disable Leakage Current
Output Enable Pull-Up Resistor
6
1.
2.
3.
4.
Symbol
f
O
V
DD
I
DD
V
OH
V
OL
V
OH
V
OL
t
R
t
F
SYM
T
OP
deltaF/F
Min
270
3.15
Typical
Maximum
800
3.45
100
V
DD
-0.880
V
DD
-1.620
V
DD
-0.880
V
DD
-1.555
600
600
55
Units
MHz
V
mA
V
V
V
V
ps
ps
%
°C
ppm
ps
V
DD
-1.025
V
DD
-1.810
V
DD
-1.085
V
DD
-1.830
45
50
-10/70 or –40/85
±20, ±25, ±50 or ±100
2
4
30
V
IH
V
IL
I
IL
0.7*V
DD
0.3*V
DD
±200
100
V
V
uA
A 0.01uF and a 0.1uF capacitor should be located as close to the supply as possible and terminated to ground.
Figure 1 defines these parameters. Figure 2 illustrates the operating conditions under which these parameters are tested and specified.
Symmetry is measured defined as On Time/Period.
Includes calibration tolerance, operating temperature, supply voltage variations, aging (40 degreesC/10 years) and shock and vibration (not under
operation).
5. Measurements made on a VCC6-QAB-622M080 using a LeCroy 8600, 25K samples.
6. Output will be enabled if Enable/Disable is left open.
t
R
80
%
Vs
20
%
t
F
On Time
Period
Figure 1. Output Waveform
Figure 2. Typical Output Test Conditions (25±5°C)
Vectron International 267 Lowell Rd, Hudson NH 03051
Tel: 1-88-VECTRON-1
e-mail: vectron@vectron.com
VCC6-Q 3.3v LVPECL Crystal Oscillator, Output Frequencies > 270MHZ
Table 2. VCC6-QAx Pinout
Pin #
Symbol
1
NC
2
E/D
3
GND
4
f
O
5
Cf
o
6
V
DD
Function
This pin has no internal connection and is floating.
Enable/Disable Function
Ground
Output Frequency
Complementary Output Frequency
Supply Voltage
Table 3. VCC6-QCx Pinout
Pin #
Symbol
1
E/D
2
NC
3
GND
4
f
O
5
Cf
o
6
V
DD
Function
Enable/Disable Function
This pin has no internal connection and is floating.
Ground
Output Frequency
Complementary Output Frequency
Supply Voltage
Contact pads are Gold over Nickel plating
Figure 3. VCC6-QCx Package Drawing
Vectron International 267 Lowell Rd, Hudson NH 03051
Tel: 1-88-VECTRON-1
e-mail: vectron@vectron.com
VCC6-Q 3.3v LVPECL Crystal Oscillator, Output Frequencies > 270MHZ
Terminating PECL Outputs
The VCC6 incorporates a standard PECL output scheme, which are un-terminated emitters as shown in
Figure 4. There are numerous application notes on terminating and interfacing PECL logic and the two most
common methods are a single resistor to ground, Figure 5, and a pull-up/pull-down scheme as shown in
Figure 6. An AC coupling capacitor is optional, depending on the application and the input logic
requirements of the next stage.
One of the most important considerations is terminating the Output and Complementary Outputs equally.
An unused output should not be left un-terminated, and if it one of the two outputs is left open it will result in
excessive jitter on both. PC board layout must take this and 50 ohm impedance matching into account.
Load matching and power supply noise are the main contributors to jitter related problems.
Figure 4. Standard PECL Output Configuration
Figure 5. Single Resistor Termination
Resistor value are typically:
120 to 240ohms for 3.3V
Figure 6. Pull-up Pull-down Termination
Resistor values are typically:
130 and 82 ohms for 3.3V
Vectron International 267 Lowell Rd, Hudson NH 03051
Tel: 1-88-VECTRON-1
e-mail: vectron@vectron.com
VCC6-Q 3.3v LVPECL Crystal Oscillator, Output Frequencies > 270MHZ
Enable/Disable Functional Description
Under normal operation the Enable/Disable is left open, or set to a logic high state, and the VCC6 is
oscillating. When the E/D is set to a logic low, the oscillator stops and the both the output and
complementary outputs are in a high impedance state. This helps facilitate board testing and
troubleshooting.
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can permanently damage the device. Functional
operation is not implied at these or any other conditions in excess of conditions represented in the
operational sections of this data sheet. Exposure to absolute maximum ratings for extended periods may
adversely affect device reliability.
Table 4. Absolute Maximum Ratings
Parameter
Symbol
Power Supply
V
DD
Enable/Disable
V
IN
Storage Temperature
Tstorage
Ratings
-0.5 to +4.6
-0.5 to V
DD
+0.5
-55/125
Unit
Vdc
Vdc
°C
Reliability
The VCC6 qualification tests included:
Table 5. Environnemental Compliance
Parameter
Mechanical Shock
Mechanical Vibration
Solderability
Gross and Fine Leak
Resistance to Solvents
Conditions
MIL-STD-883 Method 2002
MIL-STD-883 Method 2007
MIL-STD-883 Method 2003
MIL-STD-883 Method 1014
MIL-STD-883 Method 2016
Handling Precautions
Although ESD protection circuitry has been designed into the the VCC6, proper precautions should be taken
when handling and mounting. VI employs a Human Body Model and a Charged-Device Model (CDM) for
ESD susceptibility testing and design protection evaluation. ESD thresholds are dependent on the circuit
parameters used to define the model. Although no industry wide standard has been adopted for the CDM, a
standard HBM of resistance = 1.5kohms and capacitance = 100pF is widely used and therefore can be
used for comparison purposes.
Table 6. ESD Ratings
Model
Minimum
Conditions
Human Body Model
1500
MIL-STD-883 Method 3015
Charged Device Model
1500
Vectron International 267 Lowell Rd, Hudson NH 03051
Tel: 1-88-VECTRON-1
e-mail: vectron@vectron.com
