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.
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.
Block Diagram
VIN
X1
13.5 MHz
pullable
crystal
X2
Voltage
Controlled
Crystal
Oscillator
PLL/Clock
Synthesis
Circuitry
Output
Buffer
54MHz
1
Revision 060100
Printed 11/16/00
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408) 295-9800 tel • www.icst.com
MDS 3754 D
I C R O
C
LOC K
Pin Assignment
MK3754
X1
VDD
VIN
GND
1
2
3
4
MK3754
Low Cost 54 MHz 3.3 Volt VCXO
8
7
6
5
X2
GND
CLK
VDD
8 pin (150 mil) SOIC
Pin Descriptions
Number
1
2
3
4
5
6
7
8
Name
X1
VDD
VIN
GND
VDD
CLK
GND
X2
Description
Crystal 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) Capacitance
C0/C1
ESR
Operating Temperature
Initial Accuracy
Temperature plus Aging Stability
14 pF
240 max
35
Ω
max
0 to 70 °C
±20 ppm
±50 ppm
2
Revision 060100
Printed 11/16/00
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408) 295-9800 tel • www.icst.com
MDS 3754 D
I C R O
C
LOC K
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
Output Clock Rise Time
Output Clock Fall Time
Output Clock Duty Cycle
Maximum Absolute Jitter, short term
54 MHz output pullability, note 2
Notes:
Conditions
MK3754
Low Cost 54 MHz 3.3 Volt VCXO
Minimum
Typical
Maximum
7
VDD+0.5
70
260
150
3.45
0.4
Units
V
V
°C
°C
°C
V
V
V
V
mA
mA
V
MHz
ns
ns
%
ps
ppm
ABSOLUTE MAXIMUM RATINGS (note 1)
Referenced to GND
Referenced to GND
Max of 10 seconds
-65
3.15
2.4
VDD-0.4
9
±50
0
13.50000
0.8 to 2.0V
2.0 to 0.8V
At 1.4V
0V
≤
VIN
≤
3.3 V
1.5
1.5
60
3.3
-0.5
0
DC CHARACTERISTICS (VDD = 3.3 V unless noted)
IOH=-12mA
IOL=12mA
IOH=-4mA
No Load
AC CHARACTERISTICS (VDD = 3.3 V unless noted)
40
±100
50
100
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.
3
Revision 060100
Printed 11/16/00
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408) 295-9800 tel • www.icst.com
MDS 3754 D
I C R O
C
LOC K
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
Symbol
A
A1
E
INDEX
AREA
H
B
C
1
2
h x 45°
D
D
E
e
H
h
L
Inches
Min
Max
0.0532 0.0688
0.0040 0.0098
0.0130 0.0200
0.0075 0.0098
0.1890 0.1968
0.1497 0.1574
.050 BSC
0.2284 0.2440
0.0099 0.0195
0.0160 0.0500
Millimeters
Min
Max
1.35
1.75
0.10
0.24
0.33
0.51
0.19
0.24
4.80
5.00
3.80
4.00
1.27 BSC
5.80
6.20
0.25
0.50
0.41
1.27
A1
e
B
C
A
L
Ordering Information
Part/Order Number
MK3754A
MK3754ATR
MK3754S
MK3754STR
CHANGE HISTORY
Version Date first published
D
6/01/00
C
12/29/99
B
5/25/99
A
4/19/99
Marking
MK3754A
MK3754A
MK3754S
MK3754S
Status
Preliminary
Preliminary
Preliminary
Shipping packaging
tubes
tape and reel
tubes
tape and reel
Package
8 pin SOIC
8 pin SOIC
8 pin SOIC
8 pin SOIC
Temperature
0-70 °C
0-70 °C
0-70 °C
0-70 °C
Comments
Added 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.
4
Revision 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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