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ICROCLOCK
Description
MK3754
Low Cost 54 MHz 3.3 Volt VCXO
Features
• Packaged in 8 pin SOIC• 3.3 V only operating voltage
• Uses an inexpensive 13.500 MHz external crystal• On-chip VCXO (patented) with pull range of 200ppm (minimum)
• VCXO tuning voltage of 0 to 3.3 V
• 12mA output drive capability at TTL levels
• Advanced, low power, sub-micron CMOS process• The A version is the latest, manufactured in a smaller geometry process. The MK3754A gives a wider pull range than the MK3754S, and so is recommended for all new designs, and cost reductions of existing designs.
The MK3754 is ICS/Microclock’s lowest cost, low jitter, high performance 3.3 Volt VCXO and PLL clock synthesizer designed to replace expensive 54 MHz VCXOs. The on-chip Voltage Controlled Crystal Oscillator accepts a 0 to 3.3 V input voltage to vary the output clocks by ±100 ppm. Using ICS/Microclock’s patented VCXO and analog/digital Phase-Locked Loop (PLL)
techniques, the device uses an inexpensive external 13.5 MHz pullable crystal input to produce a 54 MHz output clock.
The MK3754A is a drop-in replacement to the earlier MK3754S.
Block Diagram
VIN
13.5 MHzpullablecrystal
X1X2VoltageControlledCrystalOscillatorPLL/Clock Synthesis CircuitryOutputBuffer54MHz
MDS 3754 D
1Revision 060100 Printed 11/16/00
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408) 295-9800 tel • www.icst.com
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ICROCLOCK
Pin Assignment
MK3754
Low Cost 54 MHz 3.3 Volt VCXO
MK3754
X1VDDVINGND
12348765X2GNDCLKVDD
8 pin (150 mil) SOIC
Pin Descriptions
Number12345678Name X1VDDVINGNDVDDCLKGNDX2DescriptionCrystal connection. Connect to a pullable 13.5 MHz crystal.VDD. Connect to +3.3 V.Voltage input to VCXO. Zero to 3.3V analog input which controls the frequency of the VCXO.Connect to ground.VDD. Connect to +3.3 V.54 MHz clock output.Connect to ground.Crystal connection. Connect to a pullable 13.5 MHz crystal.Pullable Crystal Specifications:
Correlation (load) CapacitanceC0/C1ESR
Operating TemperatureInitial Accuracy
Temperature plus Aging Stability
14 pF240 max35 Ω max0 to 70 °C±20 ppm±50 ppm
MDS 3754 D
2Revision 060100 Printed 11/16/00
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408) 295-9800 tel • www.icst.com
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ICROCLOCK
Electrical Specifications
ParameterMK3754
Low Cost 54 MHz 3.3 Volt VCXO
ABSOLUTE MAXIMUM RATINGS (note (note 1) Supply voltage, VDDInputs and Clock OutputsAmbient Operating TemperatureSoldering TemperatureStorage temperatureConditionsReferenced to GNDReferenced to GNDMax of 10 secondsMinimumTypicalMaximum7VDD+0.5702601503.450.4UnitsVV°C°C°CVVVVmAmAVMHznsns%psppm-0.50-653.152.4VDD-0.4 09±50DC CHARACTERISTICS (VDD = 3.3 V u.3 V unless noted)Operating Voltage, VDD Output High Voltage, VOHOutput Low Voltage, VOLOutput High Voltage, VOH, CMOS levelOperating Supply Current, IDD Short Circuit CurrentVIN, VCXO control voltageInput Crystal FrequencyOutput Clock Rise TimeOutput Clock Fall TimeOutput Clock Duty CycleMaximum Absolute Jitter, short term54 MHz output pullability, note 2Notes:
IOH=-12mAIOL=12mAIOH=-4mANo Load AC CHARACTERISTICS (VDD = 3.3 V u.3 V unless noted)0.8 to 2.0V2.0 to 0.8VAt 1.4V 0V ≤ VIN ≤ 3.3 V3.313.500001.51.560 40 ±10050100 1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged exposure to levels above the operating limits but below the Absolute Maximums may affect device reliability.2. With an ICS approved pullable crystal. The A version has a typical range of ±180 ppm.
External Components
The MK3754 requires a minimum number of external components for proper operation. A decoupling capacitor of 0.01µF should be connected between VDD and GND on pins 2 and 4, as close to the MK3754 as possible. A series termination resistor of 33 Ω may be used for the clock output. The input crystal must be connected as close to the chip as possible. The input crystal should be a parallel mode, pullable, AT cut, 13.5 MHz, with 14 pF load capacitance. Consult ICS for recommended suppliers. IMPORTANT - read application note MAN05 before laying out the PCB.
MDS 3754 D
3Revision 060100 Printed 11/16/00
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408) 295-9800 tel • www.icst.com
元器件交易网www.cecb2b.com
ICROCLOCK
MK3754
Low Cost 54 MHz 3.3 Volt VCXO
Package Outline and Package Dimensions
(For current dimensional specifications, see JEDEC Publication No. 95.)
8 pin SOIC Inchesnches MillimetlimetersSymbolMinMaxMinMaxA0.05320.06881.351.75A10.00400.00980.100.24B0.01300.02000.330.51C0.00750.00980.190.24D0.100.19684.805.00E0.14970.15743.804.00e .050 BSC BSC 1.27 BSC7 BSCH0.22840.24405.806.20h0.00990.01950.250.50L0.01600.05000.411.27EINDEXAREAH12Dh x 45°A1eBCALOrdering Information
Part/Order NumberMK3754AMK3754ATRMK3754SMK3754STRCHANGE HISTORY
VersionDate first publishedD6/01/00C12/29/99B5/25/99A4/19/99
MarkingMK3754AMK3754AMK3754SMK3754SStatusPreliminaryPreliminaryPreliminary
Shipping packagingtubestape and reeltubestape and reelPackage8 pin SOIC8 pin SOIC8 pin SOIC8 pin SOICTemperature0-70 °C0-70 °C0-70 °C0-70 °CCommentsAdded A version
Added JEDEC dimensions. Changed VDD to ±5%. Added crystal specs.Updated specs for crystal capacitance, IDD, jitter.Original
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems Incorporated (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.
MDS 3754 D
4Revision 060100 Printed 11/16/00
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408) 295-9800 tel • www.icst.com