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E2747/E2747LF STRATUM 3 TCXO (-20 to 70°C)
ISSUE 4 ; 13 JUNE 2005
Nominal Frequency, Fo
12.8MHz
Supply Voltage
3.3V ±5%
Input Current
< 4mA
Output
Type: HCMOS
Load: 15pF max
VoL: <0.1 Vs
VoH: >0.9 Vs
Duty Cycle @ 50%: 45% to 55%
Rise Time, 10% to 90%: < 9ns
Fall Time, 90% to 10%: < 9ns
Holdover Stability [±(Fmax-Fmin)/2Fo]
Temperature, –20 to 70°C: <±0.28ppm
Temperature, –20 to 70°C, inclusive of
Supply Voltage, 3.3V±5% and Ageing, 24 hours:
<±0.32ppm
Free-Run Accuracy, incl.
Calibration@25°C, Temperature –20 to 70°C, Supply
Voltage 3.3V±5% Load 15pF±5%, Reflow Soldering and
Ageing 20 years: < ±4.6ppm ref. to Nominal Frequency
Phase Noise
10Hz
< -90dBc/Hz
100Hz < -115dBc/Hz
1kHz
< -127dBc/Hz
10kHz < -137dBc/Hz
> 100kHz < -143dBc/Hz
Tri-State
Pad 8 open circuit or > 0.6Vs: Output Enabled
Pad 8 < 0.2Vs: Output in Tri-state mode
In Tri-state mode, the output stage is disabled but the
oscillator and compensation circuit are still active
(current consumption < 1mA)
Environmental Specification
Storage Temperature Range: -55 to 125°C
Vibration: IEC 60068-2-6 Test Fc procedure B4, 10-60Hz
1.5mm displacement, at 98.1m/s2, 30 minutes in each of
three mutually perpendicular axes at 1 octave per minute
Shock: IEC 60068-2-27 Test Ea, 980m/s2 acceleration for
6ms duration, 3 shocks in each direction along three
mutually perpendicular axes
Europe Tel: +44 (0)1460 270200
Americas Tel: +1 919 941 9333
Asia Tel: +86 755 8826 5991
Fax: +44 (0)1460 72578
Fax: +1 919 941 9371
Fax: +86 755 8826 5990
Solderability: MIL-STD-202, Method 208, Category 3
Resistance to Soldering Heat: 260°C / 10s exposure
Marking: Laser Marked
RoHS/Soldering: Parts with the suffix ‘LF’ on the part
number are fully compliant with the European Union
directive 2002/95/EC on the restriction of the use of
certain hazardous substances in electrical and electronic
equipment.
Note:The RoHS compliant parts are suitable for assembly
using both Lead-free solders (see Lead-free Reflow
soldering profile) and Tin / Lead solders (see Tin / Lead
Reflow soldering profile).
Marking
Manufacturers ID (CMAC)
Manufacturing Identifier (xx)
Pad 1 / Static Sensitivity Identifier ()
Abbreviated Part Number (2747)
Oscillator’s Date of Manufacture (YW)
CMAC xx
Note: Production parts will be
marked in this format. Sample
2747 YW
marking may vary
Outline in mm
7.0±0.15
1.0
1.27
59
678
3 21
4 10
0.6
Pad Connections
1.Do not connect
2.N/C
3.DC Coupled Output
(do not connect)
4.GND
5.Output
6.N/C
7.N/C
8.Tri-state Control *
9. +Vs
10.Do not connect,
or connect to GND
* see text
Website: www.cmac.com

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Lead Free Reflow Soldering Profile *
Time above 217°C: 60 to 150 secs
300 Time 25°C to Peak Temp: 480 sec max
Peak Temp
260°C
+0
-5
°C
20 to 40 sec
200
150°C to 200°C
60 to 180 seconds
100
50
Tin / Lead Reflow Soldering Profile *
Time above 183°C: 60 to 150 secs
300 Time 25°C to Peak Temp: 360 sec max
Peak Temp
240°C
+0
-5
°C
10 to 30 sec
200
100°C to 150°C
60 to 120 seconds
100
50
*Note:
These profiles were used during the qualification testing
of the product and therefore represent worst case
conditions. They are not recommended for use by the
customer in the actual assembly of these parts
Europe Tel: +44 (0)1460 270200
Americas Tel: +1 919 941 9333
Asia Tel: +86 755 8826 5991
Fax: +44 (0)1460 72578
Fax: +1 919 941 9371
Fax: +86 755 8826 5990
Website: www.cmac.com