CFSS-2 SPREAD SPECTRUM CLOCK OSCILLATORS
ISSUE 5; 27 NOVEMBER 2009 - RoHS 2002/95/EC
Outline (mm)
7.5 max
5.0 max
Pad Connections
1. Enable/Disable
2. SSON
3. GND
4. Output
5. N/C
6. +Vs
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Description
Spread spectrum surface mount oscillators in a ceramic
package with a hermetically sealed metal lid
7 x 5mm
8 to 170MHz
Tri-state CMOS
Drive Capability 15pF max
±100ppm (inclusive of supply voltage and output load
variations over the operating temperature range)
–10 to 70°C ( CFSS-2 )
–40 to 85°C ( CFSS-2I )
–40 to 85°C
Logic ‘1’ to pad 1 (>70% Vs) enables oscillator output.
Logic ‘0’ to pad 1 (<30% Vs) disables oscillator output, the
oscillator output goes to a high impedance state.
No connection to pad 1 enables oscillator outputs.
Centre Spread ±0.25, ±0.5%, ±0.75%, ±1%, ±1.5%, ±2%
Down Spread –0.5%, –1%, –1.5%, –2%, –3%, –4%,
30kHz to 33kHz
Logic ‘1’ to pad 2 (>70% Vs), spread spectrum is off.
Logic ‘0’ to pad 2 (<30% Vs), spread spectrum is on.
No connection to pad 1, spread spectrum is on.
8MHz to <133MHz
400ps max pk-pk
1
6
Package Outline
Frequency Range
Output Compatibility & Load
1.4
2
5
5.08
Underside View
3
4
OSCILLATORS
1.4±0.2
CLOCK
Solder pad layout
2.54
2.0
1.8
Frequency Stabilities (averaged frequency)
Operating Temperature Ranges
Test Circuit
Storage Temperature Range
Tri-state Operation
+Vs
Power
Supply
V
0.01µF
A
+Vs
Oscillator
6 5 4
1 2 3
2.6
4.2
Frequency
Counter
Oscilloscope
15pF*
Modulation Ratios
*Inclusive of jigging and equipment capacitance
Internal Spread Spectrum Modulation Frequency
Spread Spectrum Enable Connection ( pad 2 )
Marking Includes
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Model Number + Frequency
Loose in bulk pack or tape and reel
Tape & Reel in accordance with EIA-481-D
Frequency + Model Number + Operating Temperature
Code (if applicable) + Modulation Ratio
Packaging
Cycle to Cycle Jitter ( SS on )
133MHz to 170MHz 250ps max pk-pk
10ms max
Note:
Power-up time for all Vs to reach minimum specifed
voltage 0.05ms ~ 500ms (power ramp must be monotonic)
Shock: MIL-STD-202F, Method 213B (1000g, 0.5ms)
Vibration: MIL-STD-202F, Method 204D, Cond.D 20g, 10-
2000Hz, 4 hrs duration in each of 3 mutually perpendicular
axis
Minimum Order Information Required
Start Up Time
Environmental Specification
IQD Frequency Products Ltd, Station Road, Crewkerne, Somerset TA18 8AR, United Kingdom
Tel: +44 (1460) 270200; Fax: +44 (1460) 72578;
Email: info@iqdfrequencyproducts.com Web: www.iqdfrequencyproducts.com
Electrical Specifications - maximum limiting values
Frequency Range
8.0 to 170.0MHz
Frequency Stability
±100ppm
Supply Voltage Supply Current Rise Time (tr)
(20-80%)
3.3V
±5%
50mA
3ns
Fall Time (tf)
(80-20%)
3ns
Duty Cycle
45/55%
Model Number
CFSS-2,
CFSS-2I
Example Output Spectrum (SSon)
Example Output Spectrum (SSoff)
IQD Frequency Products Ltd, Station Road, Crewkerne, Somerset TA18 8AR, United Kingdom
Tel: +44 (1460) 270200; Fax: +44 (1460) 72578;
Email: info@iqdfrequencyproducts.com Web: www.iqdfrequencyproducts.com
CLOCK
OSCILLATORS
Ordering Example
Frequency
Model No.
Operating Temperature Code: I = –40 to 85°C; not applicable for –10 to 70°C
Modulation Ratio: M plus ratio required
Frequency Stability: C = ±100ppm
10.0MHz CFSS-2 I M
±1% C
Sensor
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