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ICS7152
Spread Spectrum Clock Generator
Description
The ICS7152-01, -02, -11, and -12 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. Center spread maintains an average frequency equal to an unspread clock. Down spread meets maximum frequency specs over the entire modualtion cycle.
Features
* * * * *
Operating voltage of 3.3 V 0.3 V Packaged in 8-pin SOIC Input frequency range of 16.6 to 134.0 MHz Output frequency range of 16.6 to 134.0 MHz Provides a spread spectrum clock output (0.5%, 1.5% center spread; -1.0%, -3.0% down spread)
* Advanced, low-power CMOS process * Industrial temperature range available * Available in Pb (lead) free package
Block Diagram
VDD
SEL FREQ XENS
XIN
PLL Clock Synthesis and Spread Spectrum Circuitry
Clock Buffer/ Crystal Ocsillator
CKOUT
XOUT External caps required with crystal for accurate tuning of the clock
GND
Product Lineup
Product Input Frequency Range Modulation Type Modulation Enable Pin
ICS7152M-01, ICS7152MI-01 ICS7152M-02, ICS7152MI-02 ICS7152M-11, ICS7152MI-11 ICS7152M-12, ICS7152MI-12
16.6 MHz to 67 MHz 40.0 MHz to 134.0 MHz 16.6 MHz to 67.0 MHz 40.0 MHz to 134.0 MHz
Down spread Yes Center spread
MDS 7152 E Integrated Circuit Systems, Inc.
1
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com
ICS7152 Spread Spectrum Clock Generator
Pin Assignment
XIN XOUT GND SEL 1 2 3 4 8 7 6 5 8 pin (150 mil) SOIC XENS FREQ VDD CKOUT
SEL Modulation Rate Setting Table
SEL Pin 4 (note1) Spread Direction Spread Percentage (%) Part Number
0
Center Down
0.5 -1.0 1.5 -3.0
1
Center Down
ICS7152M-11, ICS7152M-12 ICS7152M-01, ICS7152M-02 ICS7152M-11, ICS7152M-12 ICS7152M-01, ICS7152M-02
Modulation Enable Setting Table
XENS Pin 8 0 1 Spread Spectrum ON OFF
Frequency Setting Table
FREQ Pin 7 Frequency
0
16.6 to 40 MHz 40 to 80 MHz
1
33 to 67 MHz 66 to 134 MHz
ICS7152M-01, ICS7152M-11 ICS7152M-02, ICS7152M-12 ICS7152M-01, ICS7152M-11 ICS7152M-02, ICS7152M-12
Pin Descriptions
Pin Number Pin Name Pin Type Pin Description
1 2 3 4 5 6 7 8
XIN XOUT GND SEL CKOUT VDD FREQ XENS
Input Output Power Input Output Power Input Output
Crystal resonator connection pin/clock input pin. Crystal resonator connection pin. Connect to ground. Modulation rate setting pin. Modulated clock output pin. Connect to +3.3 V. Frequency setting pin. Modulation enable setting pin.
MDS 7152 E Integrated Circuit Systems, Inc.
2
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com
ICS7152 Spread Spectrum Clock Generator
External Components
The ICS7152 requires a minimum number of external components for proper operation.
Crystal Information
The crystal used should be a fundamental mode, 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 6, 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 ICS7152 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) 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 ICS7152. This includes signal traces just underneath the device, or on layers adjacent to the ground plane layer used by the device.
Frequency
Modulation Rate
Time
MDS 7152 E Integrated Circuit Systems, Inc.
3
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com
ICS7152 Spread Spectrum Clock Generator
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS7152. 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) max GND - 1.0 V (tUNDER < 50 ns) min
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 7152 E Integrated Circuit Systems, Inc.
4
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com
ICS7152 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
Symbol
VDD IDD VIH
Conditions
No load, at 3.3 V SEL, FREQ, XENS XIN, Input slew rate 3 V/ns, 16.6 to 100 MHz XIN, Input slew rate 3 V/ns, 100 to 134 MHz
Min.
3.0 VDD x 0.8 VDD x 0.8
Typ.
3.3 14
Max.
3.6 28 VDD + 0.3 VDD + 0.3
Units
V mA V V
VDD x 0.9
VDD + 0.3
V
Input Low Voltage
VIL
SEL, FREQ, XENS XIN, Input slew rate 3 V/ns, 16.6 to 100 MHz XIN, Input slew rate 3 V/ns, 100 to 134 MHz
GND GND
VDD x 0.20 VDD x 0.20
V V
GND
VDD x 0.10
V
Output High Voltage Output Low Voltage Input Capacitance
VOH VOL CIN
CKOUT, IOH = -4 mA CKOUT, IOL = 4 mA XIN, SEL, XENS CKOUT, 16.6 to 67 MHz
VDD - 0.5 GND
VDD 0.4 16 15 10 7 25
V V pF pF pF pF
Load Capacitance
CL
CKOUT, 67 to 100 MHz CKOUT, 100 to 134 MHz
Output Impedance
ZO
CKOUT, 16.6 to 134 MHz
MDS 7152 E Integrated Circuit Systems, Inc.
5
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com
ICS7152 Spread Spectrum Clock Generator
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 Output Frequency
Symbol
fIN fOUT
Conditions
ICS7152-01, -11 ICS7152-02, -12 CKOUT, ICS7152-01, -11 CKOUT, ICS7152-02, -12
Min.
16.6 16.6 40 16.6 40 40 45 40 0.5
Typ.
Max.
40 67 134 67 134
Units
MHz MHz MHz MHz MHz % % % V/ns ps ps ms
Input Clock Duty Cycle Output Clock Duty Cycle Output Slew Rate
tDCI tDCC
XIN, 16.6 to 100 MHz XIN, 100 to 134 MHz CKOUT, 1.5 V CKOUT, 0.4 to 2.4 V, CL = 15 pF No load, spread off, ICS7151-01, -02 No load, spread off, ICS7151-11, -12 PLL lock-time from power-up to 1% of final value
50 50
60 55 60 3.0 150 250
Cycle to Cycle Jitter
tJC
Power-up Time
2
5
Modulation Frequency
fMOD
CKOUT
33
kHz
MDS 7152 E Integrated Circuit Systems, Inc.
6
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com
ICS7152 Spread Spectrum Clock Generator
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 7152 E Integrated Circuit Systems, Inc.
7
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com
ICS7152 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 7152 E Integrated Circuit Systems, Inc.
8
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com
ICS7152
Spread Spectrum Clock Generator
Ordering Information
Part / Order Number
ICS7152M-01 ICS7152M-01T ICS7152M-01LF ICS7152M-01LFT ICS7152MI-01 ICS7152MI-01T ICS7152MI-01LF ICS7152MI-01LFT ICS7152M-02 ICS7152M-02T ICS7152M-02LF ICS7152M-02LFT ICS7152MI-02 ICS7152MI-02T ICS7152MI-02LF ICS7152MI-02LFT ICS7152M-11 ICS7152M-11T ICS7152M-11LF ICS7152M-11LFT ICS7152MI-11 ICS7152MI-11T ICS7152MI-11LF ICS7152MI-11LFT ICS7152M-12 ICS7152M-12T ICS7152M-12LF ICS7152M-12LFT ICS7152MI-12 ICS7152MI-12T ICS7152MI-12LF ICS7152MI-12LFT
Marking
7152M-01 7152M-01 7152M01L 7152M01L 7152MI01 7152MI01 7152I01L 7152I01L 7152M-02 7152M-02 7152M02L 7152M02L 7152MI02 7152MI02 7152I02L 7152I02L 7152M-11 7152M-11 7152M11L 7152M11L 7152MI11 7152MI11 7152I11L 7152I11L 7152M-12 7152M-12 7152M12L 7152M12L 7152MI12 7152MI12 7152I12L 7152I12L
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 -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 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 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 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
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 7152 E Integrated Circuit Systems, Inc.
9
525 Race Street, San Jose, CA 95126
Revision 012306 tel (408) 297-1201
www.icst.com

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