ICST ICS7152M-12LFT Spread spectrum clock generator Datasheet

ICS7152
Spread Spectrum Clock Generator
Description
Features
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.
•
•
•
•
•
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
PLL Clock
Synthesis
and Spread
Spectrum
Circuitry
FREQ
XENS
XIN
CKOUT
Clock Buffer/
Crystal
Ocsillator
XOUT
External caps required with crystal for
accurate tuning of the clock
GND
Product Lineup
Product
Input Frequency Range
ICS7152M-01, ICS7152MI-01
16.6 MHz to 67 MHz
ICS7152M-02, ICS7152MI-02
40.0 MHz to 134.0 MHz
ICS7152M-11, ICS7152MI-11
16.6 MHz to 67.0 MHz
ICS7152M-12, ICS7152MI-12
40.0 MHz to 134.0 MHz
Modulation Enable Pin
Down spread
Yes
Center spread
1
MDS 7152 E
Integrated Circuit Systems, Inc.
Modulation Type
●
525 Race Street, San Jose, CA 95126
Revision 012306
●
tel (408) 297-1201
●
www.icst.com
ICS7152
Spread Spectrum Clock Generator
Pin Assignment
SEL Modulation Rate Setting Table
XIN
1
8
XENS
XOUT
2
7
FREQ
GND
3
6
VDD
SEL
4
5
CKOUT
SEL
Pin 4
(note1)
Spread
Direction
Spread
Percentage (%)
Part Number
0
Center
±0.5
Down
-1.0
Center
±1.5
Down
-3.0
ICS7152M-11,
ICS7152M-12
ICS7152M-01,
ICS7152M-02
ICS7152M-11,
ICS7152M-12
ICS7152M-01,
ICS7152M-02
1
8 pin (150 mil) SOIC
Modulation Enable Setting Table
XENS
Pin 8
Spread Spectrum
0
ON
1
OFF
Frequency Setting Table
Frequency
FREQ
Pin 7
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
1
XIN
Input
2
XOUT
Output
Crystal resonator connection pin.
3
GND
Power
Connect to ground.
4
SEL
Input
Modulation rate setting pin.
5
CKOUT
Output
Modulated clock output pin.
6
VDD
Power
Connect to +3.3 V.
7
FREQ
Input
Frequency setting pin.
8
XENS
Output
Crystal resonator connection pin/clock input pin.
Modulation enable setting pin.
2
MDS 7152 E
Integrated Circuit Systems, Inc.
Pin Description
●
525 Race Street, San Jose, CA 95126
Revision 012306
●
tel (408) 297-1201
●
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ICS7152
Spread Spectrum Clock Generator
External Components
Crystal Information
The ICS7152 requires a minimum number of external
components for proper operation.
Decoupling Capacitor
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:
A decoupling capacitor of 0.01µF 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.
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.
Series Termination Resistor
Spread Spectrum Profile
Series termination should be used on the clock output.
To series terminate a 50Ω trace (a commonly used
trace impedance) place a 27Ω resistor in series with
the clock line, as close to the clock output pin as
possible. The nominal impedance of the clock output is
25Ω.
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.
Crystal caps (pF) = (CL - 6) x 2
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.
Time
3
MDS 7152 E
Integrated Circuit Systems, Inc.
Frequency
Modulation Rate
●
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
Rating
Supply Voltage, VDD
7V
All Inputs and Outputs (referenced to GND)
-0.5 V to VDD+0.5 V
Ambient Operating Temperature
-40 to +85°C
Storage Temperature
-55 to +125°C
Junction Temperature
-40 to +125°C
Soldering Temperature
260°C
Overshoot (VIOVER)
VDD + 1.0 V (tOVER < 50 ns) max
Undershoot (VIUNDER)
GND - 1.0 V (tUNDER < 50 ns) min
Overshoot/Undershoot
tUNDER < 50 ns
VIOVER < VDD + 1.0 V
VDD
Input pin
GND
VIUNDER < GND - 1.0 V
tOVER < 50 ns
Recommended Operation Conditions
Parameter
Min.
Ambient Operating Temperature
-40
Power Supply Voltage (measured in respect to GND)
+3.0
3.3
Max.
Units
+85
°C
3.6
V
4
MDS 7152 E
Integrated Circuit Systems, Inc.
Typ.
●
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 +85°C
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
3.0
3.3
3.6
V
14
28
mA
Operating Voltage
VDD
Supply Current
IDD
No load, at 3.3 V
Input High Voltage
VIH
SEL, FREQ, XENS
VDD x 0.8
VDD + 0.3
V
XIN, Input slew rate
3 V/ns, 16.6 to 100
MHz
VDD x 0.8
VDD + 0.3
V
XIN, Input slew rate
3 V/ns, 100 to 134
MHz
VDD x 0.9
VDD + 0.3
V
SEL, FREQ, XENS
GND
VDD x 0.20
V
XIN, Input slew rate
3 V/ns, 16.6 to 100
MHz
GND
VDD x 0.20
V
XIN, Input slew rate
3 V/ns, 100 to 134
MHz
GND
VDD x 0.10
V
Input Low Voltage
VIL
Output High Voltage
VOH
CKOUT, IOH = -4 mA
VDD - 0.5
VDD
V
Output Low Voltage
VOL
CKOUT, IOL = 4 mA
GND
0.4
V
Input Capacitance
CIN
XIN, SEL, XENS
16
pF
CKOUT, 16.6 to 67
MHz
15
pF
CKOUT, 67 to 100
MHz
10
pF
CKOUT, 100 to 134
MHz
7
pF
Load Capacitance
CL
Output Impedance
ZO
Ω
25
5
MDS 7152 E
Integrated Circuit Systems, Inc.
CKOUT, 16.6 to 134
MHz
●
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
Symbol
Conditions
Min.
Max.
Units
16.6
40
MHz
ICS7152-01, -11
16.6
67
MHz
ICS7152-02, -12
40
134
MHz
CKOUT,
ICS7152-01, -11
16.6
67
MHz
CKOUT,
ICS7152-02, -12
40
134
MHz
XIN, 16.6 to 100 MHz
40
50
60
%
XIN, 100 to 134 MHz
45
50
55
%
CKOUT, 1.5 V
40
60
%
CKOUT, 0.4 to 2.4 V,
CL = 15 pF
0.5
3.0
V/ns
No load, spread off,
ICS7151-01, -02
150
ps
No load, spread off,
ICS7151-11, -12
250
ps
5
ms
Input Crystal Frequency
Input Clock Frequency
fIN
Output Frequency
fOUT
Input Clock Duty Cycle
tDCI
Output Clock Duty Cycle
tDCC
Output Slew Rate
Cycle to Cycle Jitter
tJC
Power-up Time
Modulation Frequency
fMOD
PLL lock-time from
power-up to 1% of final
value
2
CKOUT
33
kHz
6
MDS 7152 E
Integrated Circuit Systems, Inc.
Typ.
●
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
0.4 V
CKOUT
tr
tf
SR = (2.4 - 0.4) /tr, SR = (2.4 - 0.4) /tf
Thermal Characteristics 8 SOIC
Parameter
Symbol
Thermal Resistance Junction to
Ambient
Thermal Resistance Junction to Case
Min.
Typ.
Max. Units
θJA
Still air
150
°C/W
θJA
1 m/s air flow
140
°C/W
θJA
3 m/s air flow
120
°C/W
40
°C/W
θJC
7
MDS 7152 E
Integrated Circuit Systems, Inc.
Conditions
●
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
Min
A
A1
B
C
D
E
e
H
h
L
α
H
INDEX
AREA
1 2
D
A
Inches
Max
Min
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°
Max
.0532
.0688
.0040
.0098
.013
.020
.0075
.0098
.1890
.1968
.1497
.1574
0.050 BASIC
.2284
.2440
.010
.020
.016
.050
0°
8°
h x 45
A1
C
-Ce
SEATING
PLANE
B
L
.10 (.004)
8
MDS 7152 E
Integrated Circuit Systems, Inc.
C
●
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
Marking
Shipping Packaging
Package
Temperature
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
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
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
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
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.
9
MDS 7152 E
Integrated Circuit Systems, Inc.
●
525 Race Street, San Jose, CA 95126
Revision 012306
●
tel (408) 297-1201
●
www.icst.com
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