ICST MK2754S, MK2754STR Datasheet

MK2754

ICRO

C

LOCK

Description

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 Phase­Locked 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.

Low Cost 54 MHz VCXO

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 2754 B 1 Revision 011698 Printed 11/16/00

MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•[phone]tel•[phone]fax

X2

Voltage

Controlled

Crystal

Oscillator

PLL/Clock

Synthesis
Circuitry

Output

Buffer

54MHz

MK2754

Pin Assignment

ICRO

C

LOCK

MK2754

X1

VDD

GND

1 8
2

3

4

8 pin (150 mil) SOIC

Low Cost 54 MHz VCXO

X2

7

GND

6

CLKVIN

5

VDD

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 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.

MDS 2754 B 2 Revision 011698 Printed 11/16/00

MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•[phone]tel•[phone]fax