Datasheet MK2754S, MK2754STR Datasheet (ICST)

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

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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

MK2754

ABSOLUTE MAXIMUM RATINGS (note 1)

DC CHARACTERISTICS (VDD = 5.0V unless noted)

AC CHARACTERISTICS (VDD = 5.0V unless noted)

exposure to levels above the operating limits but below the Absolute Maximums may affect device reliability.

2. With a MicroClock approved pullable crystal.

ICRO

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Low Cost 54 MHz VCXO

Electrical Specifications

Parameter Conditions Minimum Typical Maximum Units

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

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

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

Notes: 1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged

External Components

The MK2754 requires a minimum number of external components for proper operation. A decoupling
capacitor of 0.1µF should be connected between VDD and GND on pins 2 and 4, as close to the MK2754
as possible. A series termination resistor of 33Ω 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.

MDS 2754 B 3 Revision 011698 Printed 11/16/00

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

MK2754

Inches

Millimeters

ICRO

C

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Package Outline and Package Dimensions

8 pin SOIC

E H

Pin 1

h x 45°

c

Q

D

e

b

Low Cost 54 MHz VCXO

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

h 0.015 0.381

Q 0.004 0.01 0.102 0.254

A

Ordering Information

Part/Order Number Marking Shipping packaging Package Temperature

MK2754S MK2754S tubes 8 pin SOIC 0-70°C

MK2754STR MK2754S tape and reel 8 pin SOIC 0-70°C

CHANGE HISTORY
Version Date first published Status Comments

A 12/12/96 Advance Original
B 1/16/98 Final Updated pkg height.

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.

MDS 2754 B 4 Revision 011698 Printed 11/16/00

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