Datasheet MK3754STR, MK3754A, MK3754ATR Datasheet (ICST)

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• [phone] 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• [phone] tel • www.icst.com

MK3754

ABSOLUTE MAXIMUM RATINGS (note 1)

DC CHARACTERISTICS (VDD = 3.3 V unless noted)

AC CHARACTERISTICS (VDD = 3.3 V unless noted)

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.

ICRO

C

LOCK

Low Cost 54 MHz 3.3 Volt 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 3.15 3.45 V
Output High Voltage, VOH IOH=-12mA 2.4 V
Output Low Voltage, VOL IOL=12mA 0.4 V
Output High Voltage, VOH, CMOS level IOH=-4mA VDD-0.4 V
Operating Supply Current, IDD No Load 9 mA
Short Circuit Current ±50 mA
VIN, VCXO control voltage 0 3.3 V

Input Crystal Frequency 13.50000 MHz
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 100 ps
54 MHz output pullability, note 2 0V ≤ VIN ≤ 3.3 V ±100 ppm

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

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.

MDS 3754 D 3 Revision 060100 Printed 11/16/00

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• [phone] tel • www.icst.com

MK3754

Inches

Millimeters

ICRO

C

LOCK

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 Min Max Min Max

A 0.0532 0.0688 1.35 1.75

A1

B 0.0130 0.0200 0.33 0.51

C

D 0.1890 0.1968 4.80 5.00

E 0.1497 0.1574 3.80 4.00

e

H 0.2284 0.2440 5.80 6.20

h 0.0099 0.0195 0.25 0.50
L 0.0160 0.0500 0.41 1.27

A

L

INDEX

AREA

1 2

D

A1 C

e

B

E H

h x 45°

0.0040 0.0098 0.10 0.24

0.0075 0.0098 0.19 0.24

Ordering Information

Part/Order Number Marking Shipping packaging Package Temperature

MK3754A MK3754A tubes 8 pin SOIC 0-70 °C

MK3754ATR MK3754A tape and reel 8 pin SOIC 0-70 °C

MK3754S MK3754S tubes 8 pin SOIC 0-70 °C

MK3754STR MK3754S tape and reel 8 pin SOIC 0-70 °C

CHANGE HISTORY
Version Date first published Status Comments

D 6/01/00 Added A version
C 12/29/99 Preliminary Added JEDEC dimensions. Changed VDD to ±5%. Added crystal specs.
B 5/25/99 Preliminary Updated specs for crystal capacitance, IDD, jitter.
A 4/19/99 Preliminary 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.

MDS 3754 D 4 Revision 060100 Printed 11/16/00

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• [phone] tel • www.icst.com