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I C R O C LOC K
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.
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
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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 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
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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 0.01F 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 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
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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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