ICST ICS7152AMI-11LF Spread spectrum clock generator Datasheet

ICS7152A
Spread Spectrum Clock Generator
Description
Features
The ICS7152A-02 and -11 are clock generators for EMI
(Electromagnetic Interference) reduction (see below for
frequency ranges and multiplier ratios). Spectral peaks
are attenuated by modulating the system clock
frequency. Down or center spread profiles are
selectable. Down spread will not exceed the maximum
frequency of an unspread clock, and center spread
does not change the average operating frequency of
the system
•
•
•
•
•
Operating voltage of 3.3 V ±0.3 V
•
•
•
•
•
Low cycle-to-cycle jitter - less than 100 ps
ICS offers many other clocks for computers and
computer peripherals. Consult ICS when you need to
remove crystals and oscillators from your board.
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 and commercial temperature ranges
Available in Pb (lead) free package
Pin compatible with Fujitsu MB88152-102 and -111
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
Modulation Type
ICS7152AM-02, ICS7152AMI-02
40.0 MHz to 134.0 MHz
Down spread
ICS7152AM-11, ICS7152AMI-11
16.6 MHz to 67.0 MHz
Center spread
Yes
1
MDS 7152A A
Integrated Circuit Systems, Inc.
Modulation Enable Pin
●
525 Race Street, San Jose, CA 95126
Revision 102005
●
tel (408) 297-1201
●
www.icst.com
ICS7152A
Spread Spectrum Clock Generator
Pin Assignment
Spread Direction and Percentage
Select Table
XIN
1
8
XENS
XOUT
2
7
GND
3
SEL
4
Spread
Direction
Spread
Percentage (%)
Part Number
FREQ
SEL
Pin 4
6
VDD
0
Center
±0.5
ICS7152AM-11
5
CKOUT
Down
-1.0
ICS7152AM-02
Center
±1.5
ICS7152AM-11
Down
-3.0
ICS7152AM-02
1
8 pin (150 mil) SOIC
Frequency Select Table
Modulation Enable Select Table
XENS
Pin 8
Modulation
0
Modulation
1
No modulation
Frequency
FREQ
Pin 7
0
1
16.6 to 40 MHz
ICS7152AM-11
40 to 80 MHz
ICS7152AM-02
33 to 67 MHz
ICS7152AM-11
66 to 134 MHz
ICS7152AM-02
Pin Descriptions
Pin
Number
Pin
Name
Pin Type
1
XIN
Input
2
XOUT
Output
Crystal.
3
GND
Power
Connect to ground.
4
SEL
Input
Spread modulation select.
5
CKOUT
Output
Spread modulation select.
6
VDD
Power
Connect to +3.3 V.
7
FREQ
Input
Frequency select.
8
XENS
Output
Crystal/clock input pin.
Modulation enable select.
2
MDS 7152A A
Integrated Circuit Systems, Inc.
Pin Description
●
525 Race Street, San Jose, CA 95126
Revision 102005
●
tel (408) 297-1201
●
www.icst.com
ICS7152A
Spread Spectrum Clock Generator
External Components
The ICS7152A requires a minimum number of external
components for proper operation.
away from the ICS7152A. This includes signal traces
just underneath the device, or on layers adjacent to the
ground plane layer used by the device.
Decoupling Capacitor
Crystal Information
A decoupling capacitor of 0.01µF must be connected
between GND and VDD on pins 3 and 6, as close to
these pins 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.
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:
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.
PCB Layout Recommendations
For optimum device performance and lowest output
phase noise, the following guidelines should be
observed.
1) The 0.01µF 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 27Ω series termination resistor
(if needed) should be placed close to the clock output.
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.
Spread Spectrum Profile
The ICS7152A 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.
Modulation Rate
Frequency
Series Termination Resistor
Crystal caps (pF) = (CL - 6) x 2
Time
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
3
MDS 7152A A
Integrated Circuit Systems, Inc.
●
525 Race Street, San Jose, CA 95126
Revision 102005
●
tel (408) 297-1201
●
www.icst.com
ICS7152A
Spread Spectrum Clock Generator
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS7152A. 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
-0.5 to 4.0 V
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 7152A A
Integrated Circuit Systems, Inc.
Typ.
●
525 Race Street, San Jose, CA 95126
Revision 102005
●
tel (408) 297-1201
●
www.icst.com
ICS7152A
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
Operating Voltage
VDD
Supply Current
IDD
Input High Voltage
VIH
Input Low Voltage
VIL
Conditions
Min.
Typ.
Max.
Units
3.0
3.3
3.6
V
10
14
mA
No load, at 3.3 V,
output = 24 MHz
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
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 7152A A
Integrated Circuit Systems, Inc.
CKOUT, 16.6 to 134
MHz
●
525 Race Street, San Jose, CA 95126
Revision 102005
●
tel (408) 297-1201
●
www.icst.com
ICS7152A
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
Oscillation Frequency
fX
Conditions
Min.
Max.
Units
16.6
40
MHz
40
48
MHz
XIN, ICS7152A-11
16.6
67
MHz
XIN, ICS7152A-02
40
134
MHz
CKOUT, ICS7152A-11
16.6
67
MHz
CKOUT, ICS7152A-02
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,
load capacitance 15 pF
0.5
TBD
3.0
V/ns
TBD
100
ps
5
ms
XIN, XOUT,
Fundamental
oscillation
XIN, XOUT, 3rd over
tone, note 1
Input Frequency
fIN
Output Frequency
fOUT
Input Clock Duty Cycle
tDCI
Output Clock Duty Cycle
tDCC
Output Slew Rate
Typ.
Cycle to Cycle Jitter
tJC
No load, standard
deviation
Lock Time
tLK
CKOUT
2
CKOUT=TBD
33
Modulation Frequency
fMOD
kHz
Note 1: Contact ICS Applications for more information.
6
MDS 7152A A
Integrated Circuit Systems, Inc.
●
525 Race Street, San Jose, CA 95126
Revision 102005
●
tel (408) 297-1201
●
www.icst.com
ICS7152A
Spread Spectrum Clock Generator
Input Frequency (fIN = 1/tIN)
tIN
0.8 VDD
CKIN
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
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 7152A A
Integrated Circuit Systems, Inc.
Conditions
●
525 Race Street, San Jose, CA 95126
Revision 102005
●
tel (408) 297-1201
●
www.icst.com
ICS7152A
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
Millimeters
8
Symbol
E
Min
A
A1
B
C
D
E
e
H
h
L
α
H
INDEX
AREA
1 2
D
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°
*For reference only. Controlling dimensions in mm.
A
h x 45
A1
C
-Ce
SEATING
PLANE
B
L
.10 (.004)
8
MDS 7152A A
Integrated Circuit Systems, Inc.
C
●
525 Race Street, San Jose, CA 95126
Revision 102005
●
tel (408) 297-1201
●
www.icst.com
ICS7152A
Spread Spectrum Clock Generator
Ordering Information
Part / Order Number
Marking
Shipping Packaging
Package
Temperature
ICS7152AM-02
ICS7152AM-02T
ICS7152AM-02LF
ICS7152AM-02LFT
ICS7152AMI-02
ICS7152AMI-02T
ICS7152AMI-02LF
ICS7152AMI-02LFT
ICS7152AM-11
ICS7152AM-11T
ICS7152AM-11LF
ICS7152AM-11LFT
ICS7152AMI-11
ICS7152AMI-11T
ICS7152AMI-11LF
ICS7152AMI-11LFT
7152AM02
7152AM02
152AM02L
152AM02L
152AMI02
152AMI02
52AMI02L
52AMI02L
7152AM11
7152AM11
152AM11L
152AM11L
152AMI11
152AMI11
52AMI11L
52AMI11L
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
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 7152A A
Integrated Circuit Systems, Inc.
●
525 Race Street, San Jose, CA 95126
Revision 102005
●
tel (408) 297-1201
●
www.icst.com
ICS7152A
Spread Spectrum Clock Generator
Revision History
Rev.
Originator
Date
A
J. Sarma
10/20/05
Description of Change
Rev A; new device/datasheet.
10
MDS 7152A A
Integrated Circuit Systems, Inc.
●
525 Race Street, San Jose, CA 95126
Revision 102005
●
tel (408) 297-1201
●
www.icst.com
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