ICS ICS411MLF

ICS411
PC PERIPHERAL CLOCK
Description
Features
The ICS411 is a cost-effective clock synthesizer
developed to optimize component count for PC
motherboard and peripheral applications. The device
supports a common, low cost 14.31818 MHz crystal.
The device locks all output frequencies to enhance
system performance. By supporting common PC
peripheral interface frequencies including 25 MHz for
Ethernet and 24.576 MHz for audio and other
applications, the device lowers chip count enhancing
system cost and reliability.
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Low operating voltage of 3.3 V
Accepts 14.31818 MHz clock input to lower jitter
Fixed dual 25 MHz clocks for Ethernet
Fixed 24.576 MHz clock
Power consumption of 15 mA (typ) extends battery
life
Duty cycle of 45 to 55% (24.576M)
Packaged in 8-pin SOIC
Available in Pb (lead) free package
Contact ICS for custom frequency requirements
The ICS411 utilizes a low pin count 8-pin SOIC
package to optimize board space.
ICS is a leader in low jitter and power consumer
application clock sources. These devices are capable
of supporting CCD, video, audio, USB, CPU, and other
peripherals.
Block Diagram
VDD
2 4 .5 7 6 M
IC L K
1 4 .3 1 8 1 8 M H z
25M
PLL
25M
2
GND
1
MDS 411 C
In te grated Circui t Systems
l
5 25 Race Stre et, San Jose, CA 9 5126
Revision 062005
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ICS411
PC PERIPHERAL CLOCK
Pin Assignment
8
7
6
GND
GND
1
2
3
24. 576 M
4
5
2 5M
I CLK
VDD
VDD
25M
8 Pi n (150 mi l ) SOI C
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
Pin
Name
Pin
Type
ICLK
VDD
GND
24.576M
25M
25M
GND
VDD
Input
Power
Power
Output
Output
Output
Power
Power
Clock connection. Connect to 14.31818 MHz clock.
Connect to voltage supply.
Connect to ground.
24.576 MHz clock output.
25 MHz clock output.
25 MHz clock output.
Connect to ground.
Connect to voltage supply.
2
MDS 411 C
Integrated Ci rcu it Systems
Pin Description
l
525 Ra ce St reet, San Jose , CA 9512 6
Revision 062005
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w w w. i c s t . c o m
ICS411
PC PERIPHERAL CLOCK
External Components
PCB Layout Recommendations
Series Termination Resistor
For optimum device performance and lowest output
phase noise, the following guidelines should be
observed.
Clock output traces over one inch should use series
termination. To series terminate a 50Ω trace (a
commonly used trace impedance), place a 33Ω resistor
in series with the clock line, as close to the clock output
pin as possible. The nominal impedance of the clock
output is 20Ω.
Decoupling Capacitor
1) 0.01µF decoupling capacitors should be mounted on
the component side of the board as close to the VDD
pin as possible. No vias should be used between
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 33Ω series termination resistor,
if needed, should be placed close to the clock output.
As with any high performance mixed-signal IC, the
ICS411 must be isolated from system power supply
noise to perform optimally.
Decoupling capacitors of 0.01µF must be connected
between each VDD pin and the PCB ground plane.
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 ICS411. This includes signal traces just
underneath the device, or on layers adjacent to the
ground plane layer used by the device.
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS411. 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
-0.5 V to VDD+0.5 V
Ambient Operating Temperature
0 to +70 °C
Storage Temperature
-65 to +150 °C
Junction Temperature
125°C
Soldering Temperature
260°C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
Typ.
Max.
Units
0
–
+70
°C
+3.60
V
+3.00
3
MDS 411 C
Integrated Ci rcu it Systems
Min.
l
525 Ra ce St reet, San Jose , CA 9512 6
Revision 062005
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tel (408 ) 29 7-120 1
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ICS411
PC PERIPHERAL CLOCK
DC Electrical Characteristics
VDD=3.3 V ±10% Notes: 1. Nominal switching threshold is VDD/2
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
3.6
V
Operating Voltage
VDD
3.0
Input High Voltage
VIH
Note 1
Input Low Voltage
VIL
Note 1
Output High Voltage
VOH
IOH = -25 mA
Output Low Voltage
VOL
IOL = 25 mA
Operating Supply Current
IDD
No load
8
mA
Short Circuit Current
IOS
Each output
80
mA
2.0
V
0.8
2.4
V
V
0.8
V
AC Electrical Characteristics
VDD = 3.3 V ±10%, Ambient Temperature 0 to +70° C
Parameter
Symbol
Conditions
Min.
Input Frequency
Typ.
Max. Units
14.318
MHz
Output Rise Time
tOR
0.8 to 2.0 V, CL=15 pF
0.60
ns
Output Fall Time
tOF
2.0 to 0.8 V, CL=15 pF
0.60
ns
Output Clock Duty Cycle
At VDD/2, 24.576M
Absolute Jitter, Short Term
Variation from mean,
24.576M
150
ps
Absolute Jitter, Short Term
Variation from mean,
25M
115
ps
50
55
4
MDS 411 C
Integrated Ci rcu it Systems
45
l
525 Ra ce St reet, San Jose , CA 9512 6
%
Revision 062005
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ICS411
PC PERIPHERAL CLOCK
Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Narrow Body)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters
Symbol
Min
Max
Min
Max
A
1.35
1.75
.0532
.0688
A1
0.10
0.25
.0040
.0098
B
0.33
0.51
.013
.020
C
0.19
0.25
.0075
.0098
D
4.80
5.00
.1890
.1968
E
3.80
4.00
.1497
.1574
8
E
H
INDEX
AREA
Inches*
e
1.27 BASIC
0.050 BASIC
H
5.80
6.20
.2284
.2440
h
0.25
0.50
.010
.020
L
0.40
1.27
.016
.050
α
0°
8°
0°
8°
1 2
D
*For reference only. Controlling dimensions in mm.
A
h x 45
A1
C
-Ce
SEATING
PLANE
B
L
.10 (.004)
C
Ordering Information
Part / Order Number
Marking
Shipping Packaging
Package
Temperature
ICS411M
ICS411MT
ICS411MLF
ICS411MLFT
ICS411
ICS411
ICS411LF
ICS411LF
Tubes
Tape and Reel
Tubes
Tape and Reel
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
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.
5
MDS 411 C
Integrated Ci rcu it Systems
l
525 Ra ce St reet, San Jose , CA 9512 6
Revision 062005
l
tel (408 ) 29 7-120 1
l
w w w. i c s t . c o m