Temperature Compensated Crystal Oscillator
TX-320
TX-320
Description
The TX-320 series surface mount TCXO can be mounted using the standard convection reflow process. Current drain to less than 5
mA is available upon request. Aging <5 ppm for ten years.
Features
•
•
•
•
Low Profile
TTL / HCMOS Output
Frequency Range: 1 MHZ to 77.76 MHZ
Previous Model: TC-350, C2490
•
•
•
•
Applications
SMC Clock
SONET/SDH Network Timing Sources
Wireless Communications
Satellite Communications
Performance Specifications
Parameter
vs. operating temperature range
(referenced to +25°C)
Min
-2.5
-1.5
-2.0
-1.0
-1.5
-0.75
-1.0
-0.5
-1.0
-0.5
Typ
Max
+2.5
+1.5
+2.0
+1.0
+1.5
+0.75
+1.0
+0.5
+1.0
+0.5
+0.1
+5
Units
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
VDC
VDC
Condition
-55… +85°C
-55… +85°C
-40… +85°C
-40… +85°C
-20… +70°C
-20… +70°C
0… +70°C
0… +70°C
0… +50°C
0… +50°C
Vs ± 5%
@ +70°C
Frequency Stabilities
1
vs. supply voltage change
vs. aging / 10 years
Supply voltage
Supply voltage
3.135
4.75
3.3
5.0
Supply Voltage (Vs)
3.465
5.25
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Performance Specifications
Parameter
Signal
Load
Signal Level (Vol)
Signal Level (Voh)
Rise/Fall Time
Duty cycle
Signal
Load
Signal Level (Vol)
Signal Level (Voh)
Rise/Fall Time
Duty cycle
Tuning Range
40
±5.0
+2.4
10
60
+0.5
VDC
VDC
ns
%
ppm
@ (Voh-Vol)/2
via external voltage, 0 to +Vdd
40
TTL
10 TTL
with Vs=12.0V or 5.0V and 15pF load
with Vs=12.0V or 5.0V and 15pF load
0.8
5
60
Min
Typ
Max
RF Output
Units
Condition
HCMOS/ACMOS
10
+0.5
pF
V
V
ns
%
@ (Voh-Vol)/2
Frequency Tuning (EFC)
Outline Drawing / Enclosure
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Recommended Pad Layout
Recommended Reflow Profile
Note: TCXO’s are precision subsystems with tolerances measured to 0.01 ppm. Non-Hermetically sealed TCXO’s should not be
subjected to a wash process that will immerse the TCXO in solvents. NO CLEAN is the recommended procedure. The TX-320 series of
TCXO’s has been designed for pick and place reflow soldering. The suggested reflow profile is shown above. The TCXO may be rel-
fowed one time in the non-inverted state. Typical frequency shift as a result of reflow is <1.0 ppm per reflow. VI recommends waiting
at least two hours after reflow below measuring the unit.
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Output Loads
Standard Shipping Method
The Standard ship method for volume production of the TX-320 series is in a matrix tray. These trays are 100% recyclable. The trays
also offer the added feature that they can be continuously feed into a pick-n-place machine eliminating the down time required
with tape-n-reel.
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Handling Precautions
Although protection circuitry has been designed into this device, proper precautions should be taken to avoid exposure to
electrostatic discharge (ESD) during handling and mounting. VI employs a human-body model *HBM) and a charged-device model
(CDM) for ESD-susceptibility testing and protection design evaluation. ESD voltage thresholds are depending on the circuit param-
eters used to define the mode.
Although no industry-wide standard has been adopted for the CDM, a standard HBM (resistance =1500 ohms, capacitance - 1000
pf ) is widely used and therefore can be used for comparison purposes. The HBM ESD threshold presented here was obtained by us-
ing these circuit parameters.
ESD Threshold Voltage
Model
Human-Body (HBM)
Charged-Device
Threshold
500
500
Unit
V min
V min
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
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