Spread Spectrum Clock Generator Packaged 8-pin SOIC Available (le

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Spread Spectrum Clock Generator Packaged 8-pin SOIC Available (le

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MK1726-08
Spread Spectrum Clock Generator
Packaged 8-pin SOIC Available (lead) free package Input frequency range Provides modulated unmodulated clocks Accepts clock crystal input Provides down spread modulation Provides power down function Reduce electromagnetic interference (EMI) 8-16
Description
MK1726-08 generates output clock reference clock from clock crystal input. part designed lower through application spreading clock. Using ICS' proprietary analog digital Phase-Locked Loop (PLL) technology, device spreads frequency spectrum output, reducing frequency amplitude peaks several depending spread range. MK1726-08 offers range down spread from high speed clock crystal input. MK1726-08 generates modulated (SSCLK) unmodulated (REFCLK) clock compatible with Cypress CY25819. modulated clock controlled select pin, unmodulated clock same frequency input clock crystal.
Operating voltage Advanced, low-power CMOS process
Block Diagram
Clock Synthesis Spread Spectrum Circuitry REFCLK
X1/CLK Clock Buffer/ Crystal Ocsillator External caps required with crystal accurate tuning clock
SSCLK
1726-08 Integrated Circuit Systems, Inc.
Race Street, Jose, 95126
Revision 072204 (408) 297-1201
www.icst.com
MK1726-08 Spread Spectrum Clock Generator
Assignment
X1/ICLK SSCLK REFCLK
Spread Percentage Select Table
Spread Direction Down Down Down Spread Percentage -1.8 -2.5 -0.6
connect unconnected connect directly Default internal pull resitor
Descriptions
Number
Name
Type
Description
X1/ICLK SSCLK REFCLK
Input Power Input Output Power Input Power Input
Connect 16-32 crystal clock. Connect ground. Select spread percentage table above. Internal pull-up. Spread spectrum clock output table above. CMOS level clock output matches nominal frequency input crystal clock. Power down tri-state. This powers down entire chip tri-state outputs when low. Internal pull-up. Connect Connect 16-32 crystal leave unconnected.
1726-08 Integrated Circuit Systems, Inc.
Race Street, Jose, 95126
Revision 072204 (408) 297-1201
www.icst.com
MK1726-08 Spread Spectrum Clock Generator
External Components
MK1726-08 requires minimum number external components proper operation.
away from MK1726-08. This includes signal traces just underneath device, layers adjacent ground plane layer used device.
Decoupling Capacitor
decoupling capacitor 0.01µF must connected between GND, close these pins possible. optimum device performance, decoupling capacitor should mounted component side PCB. Avoid vias decoupling circuit.
Crystal Information
crystal used should fundamental mode third overtone), parallel resonant. Crystal capacitors should connected from pins ground ground optimize initial accuracy. value these capacitors given following equation: Crystal caps (pF) equation, crystal load capacitance. crystal with load capacitance, [(16-6) capacitors should used.
Series Termination Resistor
When trace between clock output load over inch, series termination should used. series terminate trace commonly used trace impedance) place resistor series with clock line, close clock output possible. nominal impedance clock output
Spread Spectrum Profile
MK1726-08 clock generator uses optimized frequency slew rate algorithm facilitate down stream tracking zero delay buffers other devices. frequency modulation amplitude constant with variations input frequency.
Layout Recommendations
optimum device performance lowest output phase noise, following guidelines should observed. 0.01µF decoupling capacitor should mounted component side board close possible. vias should used between decoupling capacitor pin. trace should kept short possible, should trace ground via. minimize EMI, series termination resistor needed) should placed close clock output. optimum layout with components same side board, minimizing vias through other signal layers. Other signal traces should routed
Modulation
Frequency
Time
1726-08 Integrated Circuit Systems, Inc.
Race Street, Jose, 95126
Revision 072204 (408) 297-1201
www.icst.com
MK1726-08 Spread Spectrum Clock Generator
Absolute Maximum Ratings
Stresses above ratings listed below cause permanent damage MK1726-08. These ratings, which standard values commercially rated parts, stress ratings only. Functional operation device these other conditions above those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect product reliability. Electrical parameters guaranteed only over recommended operating temperature range.
Item
Supply Voltage, Inputs Outputs Ambient Operating Temperature Storage Temperature Junction Temperature Soldering Temperature
Rating
-0.5 VDD+0.5 +70°C +150°C 125°C 260°C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature Power Supply Voltage (measured respect GND)
Min.
+2.97
Typ.
Max.
3.63
Units
Electrical Characteristics
Unless stated otherwise, +10%, Ambient Temperature +70°C
Parameter
Power Supply Range Input High Voltage Input Middle Voltage Input Voltage Output High Voltage Output High Voltage Output Voltage Output Voltage Power Supply Current Power Supply Current
SymboVDD VINH VINM VINL VOH1 VOH2 VOL1 VOL2 IDD2 IDD3
Conditions
Input Input Input SSCLK REFCLK SSCLK REFCLK SSCLK SSCLK MHz, load
Min.
2.97 0.85 0.40
Typ.
0.50
Max.
3.63 0.60 0.15
Units
19.0 23.0
1726-08 Integrated Circuit Systems, Inc.
Race Street, Jose, 95126
Revision 072204 (408) 297-1201
www.icst.com
MK1726-08 Spread Spectrum Clock Generator
Parameter
Input Capacitance clock output impedance Internal pull-up resistor
SymboCIN
Conditions
Min.
Typ.
Max.
Units
ohms
Electrical Characteristics
Unless stated otherwise, +10%, Ambient Temperature +70°
Parameter
Input Clock Frequency Output Clock Frequency Clock Rise Time Clock Fall Time Input Clock Duty Cycle Output Clock Duty Cycle Cycle-to-Cycle Jitter
Symbo
Conditions
Min.
Typ.
Max. Units
trise1 tfall1
SSCLK REFCLK, SSCLK REFCLK, SSCLK REFCLK @1.5V SSCLK, Fin=21MHz, Fout=21MHz REFCLK, Fin=21MHz, Fout=21MHz
Cycle-to-Cycle Jitter
Peak Frequency Reduction
1726-08 Integrated Circuit Systems, Inc.
Race Street, Jose, 95126
Revision 072204 (408) 297-1201
www.icst.com
MK1726-08 Spread Spectrum Clock Generator
Thermal Characteristics
Parameter
Thermal Resistance Junction Ambient
SymboJA
Conditions
Still flow flow
Min.
Typ.
Max. Units
°C/W °C/W °C/W °C/W
Thermal Resistance Junction Case
Marking Diagram
MK172608 ###### YYWW
Notes: ###### code. YYWW last digits year, week number that part assembled.
Marking Diagram free)
MK17268L ###### YYWW
Notes: ###### code. YYWW last digits year, week number that part assembled. designates (lead) free package.
1726-08 Integrated Circuit Systems, Inc.
Race Street, Jose, 95126
Revision 072204 (408) 297-1201
www.icst.com
MK1726-08 Spread Spectrum Clock Generator
Package Outline Package Dimensions SOIC, Mil. Narrow Body)
Package dimensions kept current with JEDEC Publication
Symbo
Millimeters
Inches
Index Area
1.35 1.75 1.10 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
0.0532 0.0688 0.0040 0.0098 0.013 0.020 0.0075 0.0098 .1890 .1968 0.1497 0.1574 0.050 Basic 0.2284 0.2440 0.010 0.020 0.016 0.050
Ordering Information
Part Order Number
MK1726-08S MK1726-08STR MK1726-08SLF MK1726-08SLFTR
Marking
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Shipping Packaging
Tubes Tape Reel Tubes Tape
Package
8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC
Temperature
+70° +70° +70° +70°
"LF" designates (lead) free package.
While information presented herein been checked both accuracy reliability, Integrated Circuit Systems (ICS) assumes responsibility either infringement patents other rights third parties, which would result from use. other circuits, patents, licenses implied. This product intended normal commercial applications. other applications such those requiring extended temperature range, high reliability, other extraordinary environmental requirements recommended without additional processing ICS. reserves right change circuitry specifications without notice. does authorize warrant product life support devices critical medical instruments.
1726-08 Integrated Circuit Systems, Inc.
Race Street, Jose, 95126
Revision 072204 (408) 297-1201
www.icst.com

Spread Spectrum Clock Generator Packaged 8-pin SOIC Available (le

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