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ICS7151
Spread Spectrum Clock Generator
Description
The ICS7151-10, -20, -40, and -50 are clock generators for EMI (Electro Magnetic Interference) reduction (see below for frequency ranges and multiplier ratios). Spectral peaks can be attenuated by slightly modulating the oscillation frequency. Both down and center spread profiles are selectable. Down spread maintains an average frequency less than an unspread clock, and will not exceed the maximum frequency of an unspread clock.
Features
* * * * *
Operating voltage of 3.3 V 0.3 V Packaged in 8-pin SOIC Available in Pb (lead) free package Input frequency range of 16.5 to 33.4 MHz Output frequency ranges of 8.3 to 16.7 MHz, 16.5 to 33.4 MHz, 33.3 to 66.7 MHz, 66.6 to 133.4 MHz 1.5% center spread; -1.0%, -3.0% down spread)
* Provides a spread spectrum clock output (0.5%, * Multiplication rates of x1/2, x1, x2, and x4 * Advanced, low-power CMOS process
Block Diagram
VDD
S1:0
2
ENS
PLL Clock Synthesis and Spread Spectrum Circuitry
Clock Buffer/ Crystal Ocsillator
CKOUT
XIN
XOUT
External caps required with crystal for accurate tuning of the clock
GND
Product Lineup
Product Input Frequency Range Multiplier Ratio Output Frequency Range
ICS7151M-10, ICS7151MI-10 ICS7151M-20, ICS7151MI-20 ICS7151M-40, ICS7151MI-40 ICS7151M-50, ICS7151MI-50
16.5 MHz to 33.4 MHz 16.5 MHz to 33.4 MHz 16.5 MHz to 33.4 MHz 16.5 MHz to 33.4 MHz
X1 X2 X4 X1/2
16.5 MHz to 33.4 MHz 33.3 MHz to 66.7 MHz 66.6 MHz to 133.4 MHz 8.3 MHz to 16.7 MHz
MDS 7151 E Integrated Circuit Systems, Inc.
1
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com
ICS7151 Spread Spectrum Clock Generator
Pin Assignment
XIN GND S0 S1 1 2 3 4 8 7 6 5 8 pin (150 mil) SOIC XOUT VDD ENS CKOUT
Spread Direction and Percentage Select Table
S1 Pin 4 (note1) 0 0 1 1 ENS (note 2) S0 Pin 3 (note1) 0 1 0 1 Spread Direction Center Center Down Down Spread Percentage (%) 1.5 0.5 -1.0 -3.0
Spread Spectrum OFF ON
0 1 Notes:
1. The modulation rate varies with input frequency. 2. Spread will default to ON when ENS pin is left open.
Pin Descriptions
Pin Number Pin Name Pin Type Pin Description
1 2 3 4 5 6 7 8
XIN GND S0 S1 CKOUT ENS VDD XOUT
Input Power Input Input Output Input Power Output
Resonator connection pin/clock input pin. Connect to ground. Select pin 0. Modulation rate setting pin. Select pin 1. Modulation rate setting pin. Modulated clock output pin. Modulation enable setting pin. Internal pull-up resistor. Connect to +3.3 V. Resonator connection pin.
MDS 7151 E Integrated Circuit Systems, Inc.
2
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com
ICS7151 Spread Spectrum Clock Generator
External Components
The ICS7151 requires a minimum number of external components for proper operation.
underneath the device, or on layers adjacent to the ground plane layer used by the device.
Crystal Information
The crystal used should be a fundamental mode (do not use third overtone), parallel resonant. Crystal capacitors should be connected from pins X1 to ground and X2 to ground to optimize the initial accuracy. The value of these capacitors is given by the following equation: Crystal caps (pF) = (CL - 6) x 2 In the equation, CL is the crystal load capacitance. So, for a crystal with a 16 pF load capacitance, two 20 pF [(16-6) x 2] capacitors should be used.
Decoupling Capacitor
A decoupling capacitor of 0.01F must be connected between GND and VDD on pin 7, as close to this pin as possible. For optimum device performance, the decoupling capacitor should be mounted on the component side of the PCB. Avoid the use of vias in the decoupling circuit.
Series Termination Resistor
Series termination should be used on the clock output. To series terminate a 50 trace (a commonly used trace impedance) place a 27 resistor in series with the clock line, as close to the clock output pin as possible. The nominal impedance of the clock output is 25.
Spread Spectrum Profile
The ICS7151 low EMI clock generator uses a triangular frequency modulation profile for optimal down stream tracking of zero delay buffers and other PLL devices. The frequency modulation amplitude is constant with variations of the input frequency.
PCB Layout Recommendations
For optimum device performance and lowest output phase noise, the following guidelines should be observed. 1) The 0.01F decoupling capacitor should be mounted on the component side of the board as close to the VDD pin as possible. No vias should be used between the decoupling capacitor and VDD pin. The PCB trace to VDD pin should be kept as short as possible, as should the PCB trace to the ground via. 2) To minimize EMI, the 27 series termination resistor (if needed) should be placed close to the clock output. 3) An optimum layout is one with all components on the same side of the board, minimizing vias through other signal layers. Other signal traces should be routed away from the ICS7151. This includes signal traces just
Modulation Rate
Frequency
Time
MDS 7151 E Integrated Circuit Systems, Inc.
3
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com
ICS7151 Spread Spectrum Clock Generator
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS7151. These ratings, which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range.
Item
Supply Voltage, VDD All Inputs and Outputs (referenced to GND) Ambient Operating Temperature Storage Temperature Junction Temperature Soldering Temperature Overshoot (VIOVER) Undershoot (VIUNDER) 7V
Rating
-0.5 V to VDD+0.5 V -40 to +85C -55 to +125C -40 to +125C 260C VDD + 1.0 V (tOVER < 50 ns) GND - 1.0 V (tUNDER < 50 ns)
Overshoot/Undershoot
tUNDER < 50 ns VIOVER < VDD + 1.0 V VDD GND VIUNDER < GND - 1.0 V
Input pin
tOVER < 50 ns
Recommended Operation Conditions
Parameter
Ambient Operating Temperature Power Supply Voltage (measured in respect to GND)
Min.
-40 +3.0
Typ.
3.3
Max.
+85 3.6
Units
C V
MDS 7151 E Integrated Circuit Systems, Inc.
4
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com
ICS7151 Spread Spectrum Clock Generator
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V 0.3 V, Ambient Temperature -40 to +85C
Parameter
Operating Voltage Supply Current Input High Voltage Input Low Voltage Output High Voltage Output Low Voltage Input Capacitance
Symbol
VDD IDD VIH VIL VOH VOL CIN
Conditions
No load, at 3.3 V XIN, S0, S1, ENS XIN, S0, S1, ENS CKOUT, IOH = -4 mA CKOUT, IOL = 4 mA XIN, S0, S1, ENS CKOUT, 8.3 to 66.7 MHz
Min.
3.0 VDDx0.8 0.0 2.0
Typ.
3.3 10
Max.
3.6 20 VDD + 0.3 VDDx0.20 0.4 16 15 10 7
Units
V mA V V V V pF pF pF pF k
Load Capacitance
CL
CKOUT, 66.7 to 100 MHz CKOUT, 100 to 133.4 MHz
Input Pull-up Resistor
RPU
ENS
100
240
400
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V 0.3 V, Ambient Temperature -40 to +85 C
Parameter
Input Crystal Frequency Input Clock Frequency
Symbol
fIN
Conditions
Min.
16.5 16.5
Typ.
Max.
33.4 33.4 33.4 66.7 133.4 16.7
Units
MHz MHz MHz MHz MHz MHz % % V/ns
CKOUT, Multiply by 1 (ICS7151-10) CKOUT, Multiply by 2 (ICS7151-20) CKOUT, Multiply by 4 (ICS7151-40) CKOUT, 2-frequency division (ICS7151-50) Input Clock Duty Cycle Output Clock Duty Cycle Output Slew Rate tDCC XIN, 16.5 to 33.4 MHz CKOUT, 1.5 V CKOUT, 0.4 to 2.4 V, CL = 15 pF
16.5 33.3 66.6 8.3 40 40 0.5 50
Output Frequency
fOUT
60 60 3.0
MDS 7151 E Integrated Circuit Systems, Inc.
5
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com
ICS7151 Spread Spectrum Clock Generator
Parameter
Symbol
Conditions
No load, spread off (ICS7151-10, -20)
Min.
Typ.
Max.
100 150 200
Units
ps ps ps ms
Cycle to Cycle Jitter
tJC
No load, spread off (ICS7151-40) No load, spread off (ICS7151-50)
Power-up Time
PLL lock-time from power-up to 1% of final value fMOD CKOUT
2
5
Modulation Frequency
33
kHz
Input Frequency (fIN = 1/tIN)
tIN 0.8 VDD XIN
Output Slew Rate
2.4 V CKOUT tr SR = (2.4 - 0.4) /tr, SR = (2.4 - 0.4) /tf tf 0.4 V
Thermal Characteristics 8 SOIC
Parameter
Thermal Resistance Junction to Ambient
Symbol
JA JA JA JC
Conditions
Still air 1 m/s air flow 3 m/s air flow
Min.
Typ.
150 140 120 40
Max. Units
C/W C/W C/W C/W
Thermal Resistance Junction to Case
MDS 7151 E Integrated Circuit Systems, Inc.
6
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com
ICS7151 Spread Spectrum Clock Generator
Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Body)
Package dimensions are kept current with JEDEC Publication No. 95
8
Millimeters Symbol
E H
Inches Min Max
Min
Max
INDEX AREA
12 D
A A1 B C D E e H h L
h x 45
1.35 1.75 0.10 0.25 0.33 0.51 0.19 0.25 4.80 5.00 3.80 4.00 1.27 BASIC 5.80 6.20 0.25 0.50 0.40 1.27 0 8
.0532 .0688 .0040 .0098 .013 .020 .0075 .0098 .1890 .1968 .1497 .1574 0.050 BASIC .2284 .2440 .010 .020 .016 .050 0 8
A A1
C
-Ce
B SEATING PLANE L
.10 (.004)
C
MDS 7151 E Integrated Circuit Systems, Inc.
7
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com
ICS7151
Spread Spectrum Clock Generator
Ordering Information
Part / Order Number
ICS7151M-10 ICS7151M-10T ICS7151M-10LF ICS7151M-10LFT ICS7151M-20 ICS7151M-20T ICS7151M-20LF ICS7151M-20LFT ICS7151M-40 ICS7151M-40T ICS7151M-40LF ICS7151M-40LFT ICS7151M-50 ICS7151M-50T ICS7151M-50LF ICS7151M-50LFT ICS7151MI-10 ICS7151MI-10T ICS7151MI-10LF ICS7151MI-10LFT ICS7151MI-20 ICS7151MI-20T ICS7151MI-20LF ICS7151MI-20LFT ICS7151MI-40 ICS7151MI-40T ICS7151MI-40LF ICS7151MI-40LFT ICS7151MI-50 ICS7151MI-50T ICS7151MI-50LF ICS7151MI-50LFT
Marking
7151M-10 7151M-10 7151M10L 7151M10L 7151M-20 7151M-20 7151M20L 7151M20L 7151M-40 7151M-40 7151M40L 7151M40L 7151M-50 7151M-50 7151M50L 7151M50L 7151MI10 7151MI10 51MI10LF 51MI10LF 7151MI20 7151MI20 51MI20LF 51MI20LF 7151MI40 7151MI40 51MI40LF 51MI40LF 7151MI50 7151MI50 51MI50LF 51MI50LF
Shipping Packaging
Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel
Package
8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC
Temperature
0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C
Parts that are ordered with a "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant. While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or critical medical instruments.
MDS 7151 E Integrated Circuit Systems, Inc.
8
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com

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