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ICS411
PC PERIPHERAL CLOCK
Description
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. 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.
Features
* * * * * * * * *
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
Block Diagram
VDD
2 4 .5 7 6 M IC L K 1 4 .3 1 8 1 8 M H z PLL 25M 25M
2 GND
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ICS411 PC PERIPHERAL CLOCK
Pin Assignment
I CLK VDD GND 24. 576 M
1 2 3 4
8 7 6 5
VDD GND 25M 2 5M
8 Pi n (150 mi l ) SOI C
Pin Descriptions
Pin Number
1 2 3 4 5 6 7 8
Pin Name
ICLK VDD GND 24.576M 25M 25M GND VDD
Pin Type
Input Power Power Output Output Output Power Power
Pin Description
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.
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ICS411 PC PERIPHERAL CLOCK
External Components
Series Termination Resistor
Clock output traces over one inch should use series termination. To series terminate a 50 trace (a commonly used trace impedance), place a 33 resistor in series with the clock line, as close to the clock output pin as possible. The nominal impedance of the clock output is 20.
PCB Layout Recommendations
For optimum device performance and lowest output phase noise, the following guidelines should be observed. 1) 0.01F 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 33 series termination resistor, if needed, should be placed close to the clock output. 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.
Decoupling Capacitor
As with any high performance mixed-signal IC, the ICS411 must be isolated from system power supply noise to perform optimally. Decoupling capacitors of 0.01F must be connected between each VDD pin and the PCB ground plane.
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
Supply Voltage, VDD All Inputs and Outputs Ambient Operating Temperature Storage Temperature Junction Temperature Soldering Temperature 7V
Rating
-0.5 V to VDD+0.5 V 0 to +70 C -65 to +150 C 125C 260C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature Power Supply Voltage (measured in respect to GND)
Min.
0 +3.00
Typ.
-
Max.
+70 +3.60
Units
C V
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DC Electrical Characteristics
VDD=3.3 V 10% Notes: 1. Nominal switching threshold is VDD/2
Parameter
Operating Voltage Input High Voltage Input Low Voltage Output High Voltage Output Low Voltage Operating Supply Current Short Circuit Current
Symbol
VDD VIH VIL VOH VOL IDD IOS
Conditions
Note 1 Note 1 IOH = -25 mA IOL = 25 mA No load Each output
Min.
3.0 2.0
Typ.
Max.
3.6 0.8
Units
V V V V V mA mA
2.4 0.8 8 80
AC Electrical Characteristics
VDD = 3.3 V 10%, Ambient Temperature 0 to +70 C
Parameter
Input Frequency Output Rise Time Output Fall Time Output Clock Duty Cycle Absolute Jitter, Short Term Absolute Jitter, Short Term
Symbol
tOR tOF
Conditions
0.8 to 2.0 V, CL=15 pF 2.0 to 0.8 V, CL=15 pF At VDD/2, 24.576M Variation from mean, 24.576M Variation from mean, 25M
Min.
Typ.
14.318 0.60 0.60
Max. Units
MHz ns ns 55 % ps ps
45
50 150 115
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Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Narrow Body)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters Symbol
8
Inches* Min Max
Min
Max
A A1 B C
E H
1.35 0.10 0.33 0.19 4.80 3.80 5.80 0.25 0.40 0
1.75 0.25 0.51 0.25 5.00 4.00 6.20 0.50 1.27 8
.0532 .0040 .013 .0075 .1890 .1497 .2284 .010 .016 0
.0688 .0098 .020 .0098 .1968 .1574 .2440 .020 .050 8
INDEX AREA
D E e H
1.27 BASIC
0.050 BASIC
12 D
h L
*For reference only. Controlling dimensions in mm.
A A1 h x 45 C
-Ce
B SEATING PLANE L
.10 (.004)
C
Ordering Information
Part / Order Number
ICS411M ICS411MT ICS411MLF ICS411MLFT
Marking
ICS411 ICS411 ICS411LF ICS411LF
Shipping Packaging
Tubes Tape and Reel Tubes Tape and Reel
Package
8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC
Temperature
0 to +70C 0 to +70C 0 to +70C 0 to +70C
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.
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