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MK2727 Low Cost 27 MHz VCXO
Description
The MK2727 is MicroClock's lowest cost, low jitter, high performance VCXO and PLL clock synthesizer designed to replace expensive 27MHz VCXOs. The on-chip Voltage Controlled Crystal Oscillator accepts a 0 to 3V input voltage to cause the output clocks to vary by 100 ppm. Using MicroClock's patented VCXO and analog PhaseLocked Loop (PLL) techniques, the device uses an inexpensive external 13.5 MHz pullable crystal input to produce a 27 MHz output clock. MicroClock manufactures the largest variety of Set-Top Box and multimedia clock synthesizers for all applications. If more clock outputs are needed, see the MK2731 or MK277x family of parts. Consult MicroClock to eliminate VCXOs, crystals and oscillators from your board.
Features
* Packaged in 8 pin narrow SOIC * Uses an inexpensive 13.500 MHz external crystal * On-chip VCXO (patented) with pull range of 200ppm (minimum) * VCXO tuning voltage of 0 to 3V * 25mA output drive capability at TTL levels * Advanced, low power, sub-micron CMOS process * 5V operating voltage
Block Diagram
VIN
X1
13.5 MHz pullable crystal
X2
Voltage Controlled Crystal Oscillator
PLL/Clock Synthesis Circuitry
Output Buffer
27MHz
MDS 2727 B
1 Revision 111600 Printed 11/16/00 Integrated Circuit Systems, Inc.*525 Race Street*San Jose*CA*95126*(408)295-9800tel*www.icst.com
MK2727 Low Cost 27 MHz VCXO
Pin Assignment
MK2727
X1 VDD VIN GND 1 2 3 4 8 7 6 5 X2 GND VDD CLK
8 pin (150 mil) SOIC
Pin Descriptions
Number 1 2 3 4 5 6 7 8 Name X1 VDD VIN GND CLK VDD GND X2 Description Crystal connection. Connect to a pullable 13.5 MHz crystal. VDD. Connect to +5V. Voltage input to VCXO. Zero to 3V analog input which controls the frequency of the VCXO. Connect to ground. 27 MHz clock output. VDD. Connect to +5V. Connect to ground. Crystal connection. Connect to a pullable 13.5 MHz crystal.
MDS 2727 B
2 Revision 111600 Printed 11/16/00 Integrated Circuit Systems, Inc.*525 Race Street*San Jose*CA*95126*(408)295-9800tel*www.icst.com
MK2727 Low Cost 27 MHz VCXO
Electrical Specifications
Parameter Supply voltage, VDD Inputs and Clock Outputs Ambient Operating Temperature Soldering Temperature Storage temperature Operating Voltage, VDD Output High Voltage, VOH Output Low Voltage, VOL Output High Voltage, VOH, CMOS level Operating Supply Current, IDD Short Circuit Current VIN, VCXO control voltage Input Crystal Frequency Input Crystal Accuracy Output Clock Rise Time Output Clock Fall Time Output Clock Duty Cycle Maximum Absolute Jitter, short term 27 MHz output pullability, note 2 Notes: Conditions Referenced to GND Referenced to GND Max of 10 seconds -65 4.75 2.4 VDD-0.4 20 100 0 13.50000 0.8 to 2.0V 2.0 to 0.8V At 1.4V 0V VIN 3V 30 1.5 1.5 60 3 Minimum Typical Maximum 7 VDD+0.5 70 260 150 5.25 0.4 Units V V C C C V V V V mA mA V MHz ppm ns ns % ps ppm
ABSOLUTE MAXIMUM RATINGS (note 1)
-0.5 0
DC CHARACTERISTICS (VDD = 5.0V unless noted)
IOH=-25mA IOL=25mA IOH=-8mA No Load
AC CHARACTERISTICS (VDD = 5.0V unless noted)
40 100
50 200
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 a MicroClock approved pullable crystal.
External Components
The MK2727 requires a minimum number of external components for proper operation. A decoupling capacitor of 0.1F should be connected between VDD and GND on pins 2 and 4, as close to the MK2727 as possible. A series termination resistor of 33 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, 13.5MHz, with 14pF load capacitance. Consult MicroClock for recommended suppliers. IMPORTANT read application note MAN05 before laying out the PCB.
MDS 2727 B
3 Revision 111600 Printed 11/16/00 Integrated Circuit Systems, Inc.*525 Race Street*San Jose*CA*95126*(408)295-9800tel*www.icst.com
MK2727 Low Cost 27 MHz VCXO
Package Outline and Package Dimensions 8 pin SOIC
Symbol A b D E H e h Q Inches Min Max 0.055 0.068 0.013 0.019 0.185 0.200 0.150 0.160 0.225 0.245 .050 BSC 0.015 0.004 0.01 Millimeters Min Max 1.397 1.7272 0.330 0.483 4.699 5.080 3.810 4.064 5.715 6.223 1.27 BSC 0.381 0.102 0.254
E Pin 1
H
D Q e b c
h x 45 A
Ordering Information
Part/Order Number MK2727S MK2727STR Marking MK2727S MK2727S Shipping packaging tubes tape and reel Package 8 pin SOIC 8 pin SOIC Temperature 0-70C 0-70C
CHANGE HISTORY Version Date first published A 12/12/96 B 12/2/97
Status Advance Released
Comments Original Updated logo & address. Corrected pkg height.
While the information presented herein has been checked for both accuracy and reliability, MicroClock Incorporated 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 MicroClock. MicroClock reserves the right to change any circuitry or specifications without notice. MicroClock does not authorize or warrant any MicroClock product for use in life support devices or critical medical instruments.
MDS 2727 B
4 Revision 111600 Printed 11/16/00 Integrated Circuit Systems, Inc.*525 Race Street*San Jose*CA*95126*(408)295-9800tel*www.icst.com

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