ICST MK2727STR, MK2727S Datasheet
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
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
X2
Voltage
Controlled
Crystal
Oscillator
PLL/Clock
Synthesis
Circuitry
Output
Buffer
27MHz
Pin Assignment
MK2727
Low Cost 27 MHz VCXO
MK2727
X1
VDD
VIN
GND
1 8
2
3
4
X2
7
GND
6
VDD
5
CLK
8 pin (150 mil) SOIC
Pin Descriptions
Number Name Description
1 X1 Crystal connection. Connect to a pullable 13.5 MHz crystal.
2 VDD VDD. Connect to +5V.
3 VIN Voltage input to VCXO. Zero to 3V analog input which controls the frequency of the VCXO.
4 GND Connect to ground.
5 CLK 27 MHz clock output.
6 VDD VDD. Connect to +5V.
7 GND Connect to ground.
8 X2 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
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