ICST MK3754STR, MK3754A, MK3754ATR Datasheet
MK3754
ICRO
C
LOCK
Description
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.
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
Block Diagram
VIN
13.5 MHz
pullable
crystal
X1
X2
Voltage
Controlled
Crystal
Oscillator
reductions of existing designs.
PLL/Clock
Synthesis
Circuitry
Output
Buffer
54MHz
MDS 3754 D 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
MK3754
ICRO
C
LOCK
Low Cost 54 MHz 3.3 Volt VCXO
Pin Assignment
MK3754
X1
VDD
GND
1 8
2
3
4
X2
7
GND
6
CLKVIN
5
VDD
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 +3.3 V.
3 VIN Voltage input to VCXO. Zero to 3.3V analog input which controls the frequency of the VCXO.
4 GND Connect to ground.
5 VDD VDD. Connect to +3.3 V.
6 CLK 54 MHz clock output.
7 GND Connect to ground.
8 X2 Crystal connection. Connect to a pullable 13.5 MHz crystal.
Pullable Crystal Specifications:
Correlation (load) Capacitance 14 pF
C0/C1 240 max
ESR 35 Ω max
Operating Temperature 0 to 70 °C
Initial Accuracy ±20 ppm
Temperature plus Aging Stability ±50 ppm
MDS 3754 D 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
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