MK2754
Low Cost 54 MHz VCXO
MDS 2754 B
1
Revision 011698
Printed 11/16/00
MicroClock Division of ICS1271
Parkmoor Ave.San JoseCA95126(408)295-9800tel(408)295-9818fax
I C R O
C
LOC K
Block Diagram
Description
Features
The MK2754 is MicroClock's lowest cost, low
jitter, high performance VCXO and PLL clock
synthesizer designed to replace expensive 54 MHz
VCXOs. The on-chip Voltage Controlled Crystal
Oscillator accepts a 0 to 3V input voltage to vary
the output clocks by 100 ppm. Using
MicroClock's patented VCXO and analog Phase-
Locked Loop (PLL) techniques, the device uses an
inexpensive external 13.5 MHz pullable crystal
input to produce a 54 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.
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
Voltage
Controlled
Crystal
Oscillator
PLL/Clock
Synthesis
Circuitry
13.5 MHz
pullable
crystal
X1
X2
VIN
Output
Buffer
54MHz
MK2754
Low Cost 54 MHz VCXO
MDS 2754 B
2
Revision 011698
Printed 11/16/00
MicroClock Division of ICS1271
Parkmoor Ave.San JoseCA95126(408)295-9800tel(408)295-9818fax
I C R O
C
LOC K
Pin Descriptions
Pin Assignment
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
VDD
VDD. Connect to +5V.
6
CLK
54 MHz clock output.
7
GND
Connect to ground.
8
X2
Crystal connection. Connect to a pullable 13.5 MHz crystal.
8 pin (150 mil) SOIC
MK2754
1
8
2
3
4
7
6
5
X2
X1
GND
VDD
CLK
VIN
GND
VDD
MK2754
Low Cost 54 MHz VCXO
MDS 2754 B
3
Revision 011698
Printed 11/16/00
MicroClock Division of ICS1271
Parkmoor Ave.San JoseCA95126(408)295-9800tel(408)295-9818fax
I C R O
C
LOC K
Parameter
Conditions
Minimum
Typical
Maximum
Units
ABSOLUTE MAXIMUM RATINGS (note 1)
ABSOLUTE MAXIMUM RATINGS (note 1)
Supply voltage, VDD
Referenced to GND
7
V
Inputs and Clock Outputs
Referenced to GND
-0.5
VDD+0.5
V
Ambient Operating Temperature
0
70
C
Soldering Temperature
Max of 10 seconds
260
C
Storage temperature
-65
150
C
DC CHARACTERISTICS (VDD = 5.0V unless noted)
DC CHARACTERISTICS (VDD = 5.0V unless noted)
Operating Voltage, VDD
4.75
5.25
V
Output High Voltage, VOH
IOH=-25mA
2.4
V
Output Low Voltage, VOL
IOL=25mA
0.4
V
Output High Voltage, VOH, CMOS level
IOH=-8mA
VDD-0.4
V
Operating Supply Current, IDD
No Load
20
mA
Short Circuit Current
100
mA
VIN, VCXO control voltage
0
3
V
AC CHARACTERISTICS (VDD = 5.0V unless noted)
AC CHARACTERISTICS (VDD = 5.0V unless noted)
Input Crystal Frequency
13.50000
MHz
Input Crystal Accuracy
30
ppm
Output Clock Rise Time
0.8 to 2.0V
1.5
ns
Output Clock Fall Time
2.0 to 0.8V
1.5
ns
Output Clock Duty Cycle
At 1.4V
40
50
60
%
Maximum Absolute Jitter, short term
200
ps
54 MHz output pullability, note 2
0V
VIN
3V
100
ppm
Electrical Specifications
Notes:
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 MK2754 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 MK2754
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.
MK2754
Low Cost 54 MHz VCXO
MDS 2754 B
4
Revision 011698
Printed 11/16/00
MicroClock Division of ICS1271
Parkmoor Ave.San JoseCA95126(408)295-9800tel(408)295-9818fax
I C R O
C
LOC K
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.
Package Outline and Package Dimensions
Ordering Information
Part/Order Number
Marking
Shipping packaging
Package
Temperature
MK2754S
MK2754S
tubes
8 pin SOIC
0-70C
MK2754STR
MK2754S
tape and reel
8 pin SOIC
0-70C
CHANGE HISTORY
Version Date first published
Status
Comments
A
12/12/96
Advance
Original
B
1/16/98
Final
Updated pkg height.
Inches
Inches
Millimeters
Millimeters
Symbol
Min
Max
Min
Max
A
0.055
0.070
1.397
1.778
b
0.013
0.019
0.330
0.483
D
0.185
0.200
4.699
5.080
E
0.150
0.160
3.810
4.064
H
0.225
0.245
5.715
6.223
e .050 BSC
.050 BSC
1.27 BSC
1.27 BSC
h
0.015
0.381
Q
0.004
0.01
0.102
0.254
8 pin SOIC
c
A
b
D
E
H
e
h x 45
Q
Pin 1
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