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
• Pb (lead) free package, RoHS compliant
Block Diagram
VDD
SEL
PLL Clock
Synthesis
and Spread
Spectrum
Circuitry
FREQ
XENS
CKOUT
XIN
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
IDT® SPREAD SPECTRUM CLOCK GENERATOR
1
Modulation Type
Modulation Enable Pin
Down spread
Yes
Center spread
ICS7152
REV K 062911
ICS7152
SPREAD SPECTRUM CLOCK GENERATOR
SSCG
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
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
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
Input
Modulation enable setting pin.
IDT® SPREAD SPECTRUM CLOCK GENERATOR
Pin Description
Crystal resonator connection pin/clock input pin.
2
ICS7152
REV K 062911
ICS7152
SPREAD SPECTRUM CLOCK GENERATOR
SSCG
External Components
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.
The ICS7152 requires a minimum number of external
components for proper operation.
Decoupling Capacitor
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.
Modulation Rate
Series Termination Resistor
Frequency
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.
Time
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.
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.
IDT® SPREAD SPECTRUM CLOCK GENERATOR
3
ICS7152
REV K 062911
ICS7152
SPREAD SPECTRUM CLOCK GENERATOR
SSCG
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS7152. These ratings, which are
standard values for IDT 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
IDT® SPREAD SPECTRUM CLOCK GENERATOR
4
Typ.
3.3
Max.
Units
+85
°C
3.6
V
ICS7152
REV K 062911
ICS7152
SPREAD SPECTRUM CLOCK GENERATOR
SSCG
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
Output Impedance
CL
ZO
IDT® SPREAD SPECTRUM CLOCK GENERATOR
CKOUT, 16.6 to 134
MHz
5
Ω
25
ICS7152
REV K 062911
ICS7152
SPREAD SPECTRUM CLOCK GENERATOR
SSCG
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V ±0.3 V, Ambient Temperature -40 to +85° C
Parameter
Symbol
Conditions
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
Input Crystal Frequency
Input Clock Frequency
Output Frequency
Input Clock Duty Cycle
Output Clock Duty Cycle
fIN
fOUT
tDCI
tDCC
Output Slew Rate
Cycle-to-Cycle Jitter
tJC
Power-up Time
Modulation Frequency
IDT® SPREAD SPECTRUM CLOCK GENERATOR
fMOD
Min.
Typ.
No load, spread off,
ICS7152-01, -02
150
No load, spread off,
ICS7152-11, -12
250
No load, spread off,
ICS7152-01, 33.33 MHz,
SEL = 0, FREQ = 1
120
ps
PLL lock-time from power-up
to 1% of final value
2
CKOUT
33
6
ICS7152
5
ms
kHz
REV K 062911
ICS7152
SPREAD SPECTRUM CLOCK GENERATOR
SSCG
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
Thermal Resistance Junction to
Ambient
Thermal Resistance Junction to Case
IDT® SPREAD SPECTRUM CLOCK GENERATOR
Symbol
Conditions
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
ICS7152
REV K 062911
ICS7152
SPREAD SPECTRUM CLOCK GENERATOR
SSCG
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
A
A1
B
C
D
E
e
H
h
L
α
H
INDEX
AREA
1 2
D
A
Min
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
B
SEATING
PLANE
L
.10 (.004)
IDT® SPREAD SPECTRUM CLOCK GENERATOR
C
8
ICS7152
REV K 062911
ICS7152
SPREAD SPECTRUM CLOCK GENERATOR
SSCG
Ordering Information
Part / Order Number
Marking
Shipping Packaging
Package
Temperature
7152M-01LF
7152M-01LFT
7152MI-01LF
7152MI-01LFT
7152M-02LF
7152M-02LFT
7152MI-02LF
7152MI-02LFT
7152M-11LF
7152M-11LFT
7152MI-11LF
7152MI-11LFT
7152M-12LF
7152M-12LFT
7152MI-12LF
7152MI-12LFT
52M-01LF
52M-01LF
52MI01LF
52MI01LF
7152M02L
7152M02L
52MI02LF
52MI02LF
7152M11L
7152M11L
52MI11LF
52MI11LF
52M-12LF
52M-12LF
52MI12LF
52MI12LF
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
0 to +70° C
0 to +70° C
-40 to +85° C
-40 to +85° C
0 to +70° C
0 to +70° C
-40 to +85° C
-40 to +85° C
0 to +70° C
0 to +70° C
-40 to +85° C
-40 to +85° C
0 to +70° C
0 to +70° C
-40 to +85° C
-40 to +85° C
"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 Device Technology (IDT) 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 IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT
does not authorize or warrant any IDT product for use in life support devices or critical medical instruments.
IDT® SPREAD SPECTRUM CLOCK GENERATOR
9
ICS7152
REV K 062911
ICS7152
SPREAD SPECTRUM CLOCK GENERATOR
SSCG
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