VF231C
Crystal Oscillators LVPECL/LVDS 3.3V
5X7 mm Surface Mount
750 KHz to 800 MHz
Description
Valpey Fisher’s VF231C surface mount oscillators provide waveforms for clocking LVPECL and LVDS circuits. The
5X7mm footprint package provides the performance of larger oscillators with a level of board space reduction
achieved. ASIC technology is used to accomplish size reduction and enhance performance and reliability. Low jitter
output signals are generated. The wide range of frequencies offered, many stability options, and industrial
temperature range availability, make this model the solution for many applications. A tristate function is included to
allow for easy automated testing of assemblies. Tape and reel packaging is standard.
Features
High speed – Low jitter LVPECL or LVDS output
with tristate
Small SMD package (5X7 mm)
Stability options from +/-20ppm to +/-100ppm
Commercial or industrial temperature range
Rugged, hermetic package for automated
assembly
Typical Applications
Telecom / networking systems that require low
jitter clocks
DSL
10 Gigabit Ethernet
SONET / SDH / Fibre Channel
*Not recommended for new designs below 640MHz – see VFXO301*
CONNECTIONS
PIN 1
Pin 2
PIN 3
PIN 4
PIN 5
PIN 6
N/C
Tristate
Ground
Output 1: Q
Output 2: Q
+V
DD
Valpey Fisher Corporation
•
75 South Street, Hopkinton, MA 01748
•
Tel. 1-800-XTALREP, 508-435-6831
•
FAX 508 4355289
1
Rev C1208
VF231C
Crystal Oscillators LVPECL/LVDS 3.3V
5X7 mm Surface Mount
750 KHz to 800 MHz
ELECTRICAL SPECIFICATIONS
Frequency Range
750 KHz to 800 MHz
100, 50, 25 or 20 ppm
Frequency Stability
Includes calibration at 25°C, operating
temperature, change of input voltage,
change of load, shock and vibration
ENVIRONMENTAL SPECIFICATIONS
Temperature
*Operating
0° to 70°C
Storage
-55°to +125°C
Shock-
1000 Gs, 0.35 ms, ½ sine wave, 3 shocks in each plane
Vibration-
10-2000 Hz of .06” d.a. or 20 Gs, whichever is less
Humidity-
Resistant to 85° R.H. at 85°C
Input Voltage, V
DD
Jitter
Period jitter RMS
19.44MHz
77.76MHz
155.52MHz
622.08MHz
Integrated jitter RMS
12 KHz to 20 MHz @ 155.52MHz
MIN
3.15
TYP
3.3
2.2
3.5
4.3
5.0
2.6
50
50
MAX
3.45
3.5
5.0
5.8
6.5
4
60
60
UNITS
volts
ps
ps
ps
ps
ps
percent
percent
MECHANICAL SPECIFICATIONS
Leak-
MIL STD 883, Method 1014, Condition A1
Case-
Ceramic with hermetic resistance-welded metal lid
Pads-
Solderable gold over nickel
Marking-
Epoxy ink or laser engraved
Resistance to solvents-
MIL STD 202, Method 215
*Operating -40 to +85°C also available.
MARKING SPECIFICATION
The format for the marking is:
Valpey-Fisher
Oscillator
Model Code (XX) Date Code
(YY)
Symmetry at (V
DD
-1.3) V
DC
(PECL)
40
40
At (1.25 V
DC
) (LVDS)
Aging
First year
After first year
Tristate
Input Requirements for Pin 2:
“1”: On-Pin 1 may float or 2.8V min
“0”: Tristate-Pin 1 requires 0.4V max
Typical Phase Noise (dBc/Hz)
Oscillator Frequency
19.44MHz
106.25MHz
155.52MHz
622.08MHz
10Hz
-80
-72
-65
-55
100Hz
-108
-103
-95
-85
3
1
ppm
ppm/yr
Pin 1
VF231CXX
750.00
YYXX
1KHz
-132
-122
-120
-109
10KHz
-142
-130
-125
-115
100KHz
-150
-125
-121
-110
Frequency
Valpey Fisher Corporation
•
75 South Street, Hopkinton, MA 01748
•
Tel. 1-800-XTALREP, 508-435-6831
•
FAX 508 4355289
2
Rev C1208
VF231C
Crystal Oscillators LVPECL/LVDS 3.3V
5X7 mm Surface Mount
750 KHz to 800 MHz
PECL Output Models
Electrical Specifications
.
RL = 50
Ω
to (V
DD
- 2V)
(see figure)
Output High Voltage, V
OH
Output Low Voltage, V
OL
Input Current, PECL
0.75 – 24 MHz
24 – 160 MHz
160 – 800 MHz
Switching Characteristics
Clock Rise Time, tr
@20/80%
Clock Fall Time, tf
@80/20%
LVDS Output Models
Electrical Specifications
MIN
RL = 100
Ω
(see figure)
Output Differential Voltage, V
OD
247
Output High Voltage, V
OH
Output Low Voltage, V
OL
0.9
Offset Voltage, V
OS
1.125
Input Current, LVDS
0.75 – 24 MHz
24 – 96 MHz
96 – 800 MHz
Switching Characteristics
Differential Clock Rise Time, tr
Differential Clock Fall Time, tf
0.3
0.3
TYP
355
1.4
1.1
1.2
MAX
454
1.6
1.375
25
45
80
0.4
0.4
UNITS
mV
V
V
V
mA
mA
mA
ns
ns
MIN
TYP
MAX
UNITS
V
V
mA
mA
mA
VDD-1.025
VDD-1.620
25
65
100
0.3
0.3
0.35
0.35
ns
ns
HOW TO ORDER
For part Number, put package type before model number, and add frequency in MHz, for example:
VF231C
A
A
T
A
Output Logic
A=45/55%LVDS
B=40/60%LVDS
C=45/55%PECL
D=40/60%PECL
125
Frequency
M
M=MHZ
K=KHz
Frequency Stability
A=+/-100ppm
B=+/-50ppm
C=+/-25ppm
D=+/-20ppm
Temperature Range Tristate
A=0 to 70°C
T=Tristate
B=-40 to +85°C
N=Non Tristate
Valpey Fisher Corporation
•
75 South Street, Hopkinton, MA 01748
•
Tel. 1-800-XTALREP, 508-435-6831
•
FAX 508 4355289
3
Rev C1208
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