Clock Generator MK1728-01 generates output clock from clock cryst

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Clock Generator MK1728-01 generates output clock from clock cryst

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MK1728-01
Clock Generator
MK1728-01 generates output clock from clock crystal input. Operating part designed dither interface clock PDAs, printers, scanners, modems, copiers, others. Using ICS' proprietary analog digital Phase-Locked Loop (PLL) technology, device spreads frequency spectrum output, reducing frequency amplitude peaks several MK1728-01 offers both centered down spread from high-speed clock input. offers many other clocks computers computer peripherals. Consult when need remove crystals oscillators from your board.
Features
Operating voltage Packaged 8-pin SOIC/TSSOP Provides spread spectrum (Center down
spread) clock output
Accepts clock crystal input (provides same
frequency dithered output)
Input frequency range Output frequency range
Multiplier)
Peak reduction typical
through 19th harmonics
feature disabled tolerant inputs (S0,S1, FRSEL, Advanced, low-power CMOS process
Block Diagram
S1:0
Clock Synthesis Spread Spectrum Circuitry
Clock Buffer/ Crystal Ocsillator
FRSEL
SSCLK
X1/CLK
External caps required with crystal accurate tuning clock
1728-01 Integrated Circuit Systems, Inc.
Race Street, Jose, 95126
Revision 081204 (408) 297-1201
www.icst.com
MK1728-01 Clock Generator
Assignment
Spread Direction Percentage Select Table
X1/ICLK SSCLK
FRSEL
FRSEL (pin
Spread Direction Center Center Center Center Spread Down Down Down Down
Spread Percentage ±0.5 ±1.0 ±1.5 ±2.0 -0.5 -1.0 -1.5 -2.0 Multiplier Output Freq. Range 16.0MHz 16.0 36.0MHz
(150 mil) SOIC/TSSOP
Input Freq. Range 16.0MHz 16.0 36.0MHz
connect unconnected (floating) connect directly
Descriptions
Number Name Type
FRSEL SSCLK X1/ICLK
Power Power Input Input Output Input Input
Crystal connection crystal. Leave unconnected clock. Connect +2.5 Connect ground. Function select input frequency range. Default mid-level "M". Function select input. Selects spread amount direction table above (default-internal mid-level). Clock output with spread spectrum. Function select input. Selects spread amount direction table above (default-internal mid-level). Connect crystal clock.
1728-01 Integrated Circuit Systems, Inc.
Race Street, Jose, 95126
Revision 081204 (408) 297-1201
www.icst.com
MK1728-01 Clock Generator
External Components
MK1728-01 requires minimum number external components proper operation. optimum layout with components same side board, minimizing vias through other signal layers. Other signal traces should routed away from MK1728-01. This includes signal traces just underneath device, layers adjacent ground plane layer used device.
Decoupling Capacitor
decoupling capacitor 0.01µF must connected between pins 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
Tri-level Select Operation
select pins tri-level, meaning they have three separate states make selections shown table page select (mid) level, connection these pins must eliminated either floating them originally, tri-stating GPIO pins which drive select pins.
Spread Spectrum Profile
MK1728-01 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.
Frequency
Modulation Rate
Time
1728-01 Integrated Circuit Systems, Inc.
Race Street, Jose, 95126
Revision 081204 (408) 297-1201
www.icst.com
MK1728-01 Clock Generator
Absolute Maximum Ratings
Stresses above ratings listed below cause permanent damage MK1728-01. 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.
+2.375
Typ.
Max.
2.625
Units
Electrical Characteristics
Unless stated otherwise, Ambient Temperature +70°C
Parameter
Operating Voltage Supply Current Input Frequency Input High Voltage Input Middle Voltage Input Voltage Output High Voltage Output Voltage Input Capacitance
Symbol
Conditions
load, Fin=32
Min.
2.375
Typ.
Max.
2.625 VDD-0.7
Units
CIN1 CIN2 FRSEL pins pins VDD-0.6 VDD-1.8
1728-01 Integrated Circuit Systems, Inc.
Race Street, Jose, 95126
Revision 081204 (408) 297-1201
www.icst.com
MK1728-01 Clock Generator
Electrical Characteristics
Unless stated otherwise, CL=15 Ambient Temperature +70°
Parameter
Input Clock Frequency Output Clock Frequency Input Clock Duty Cycle Output Clock Duty Cycle Cycle Cycle Jitter
Symbol
Conditions
Min.
Typ.
Max. Units
Time above VDD/2 Time above 1.25 Fin=(4-8) MHz, Fout=(4-8) =(8-36) MHz, Fout (8-36)
1.82 1.82
2.62 2.62
Output Rise Time Output Fall Time Modulation Rate Peak Frequency Reduction
FMOD
Fin=24
Thermal Characteristics SOIC
Parameter
Thermal Resistance Junction Ambient
Symbol
Conditions
Still flow flow
Min.
Typ.
Max. Units
°C/W °C/W °C/W °C/W
Thermal Resistance Junction Case
Thermal Characteristics TSSOP
Parameter
Thermal Resistance Junction Ambient
Symbol
Conditions
Still flow flow
Min.
Typ.
Max. Units
°C/W °C/W °C/W °C/W
Thermal Resistance Junction Case
1728-01 Integrated Circuit Systems, Inc.
Race Street, Jose, 95126
Revision 081204 (408) 297-1201
www.icst.com
MK1728-01 Clock Generator
Package Outline Package Dimensions (8-pin TSSOP)
Package dimensions kept current with JEDEC Publication
Millimeters Symbol
Inches
AREA
-1.20 0.05 0.15 0.80 1.05 0.19 0.30 0.09 0.20 2.90 3.10 6.40 BASIC 4.30 4.50 0.65 Basic 0.45 0.75 0.10
-0.047 0.002 0.006 0.032 0.041 0.007 0.012 0.0035 0.008 0.114 0.122 0.252 BASIC 0.169 0.177 0.0256 Basic 0.018 0.030 0.004
1728-01 Integrated Circuit Systems, Inc.
Race Street, Jose, 95126
Revision 081204 (408) 297-1201
www.icst.com
MK1728-01 Clock Generator
Package Outline Package Dimensions (8-pin SOIC, Mil. Body)
Package dimensions kept current with JEDEC Publication
Millimeters Symbol
Inches
INDEX AREA
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
.0532 .0688 .0040 .0098 .013 .020 .0075 .0098 .1890 .1968 .1497 .1574 0.050 BASIC .2284 .2440 .010 .020 .016 .050
SEATING PLANE
(.004)
Ordering Information
Part Order Number
MK1728-01G MK1728-01GTR MK1728-01S MK1728-01STR
Marking
172801 172801 172801S 172801S
Shipping Packaging
Tubes Tape Reel Tubes Tape Reel
Package
8-pin TSSOP 8-pin TSSOP 8-pin SOIC 8-pin SOIC
Temperature
+70° +70° +70° +70°
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.
1728-01 Integrated Circuit Systems, Inc.
Race Street, Jose, 95126
Revision 081204 (408) 297-1201
www.icst.com

Clock Generator MK1728-01 generates output clock from clock cryst

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