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Description
The MK1704A is an upgraded version of the MK1704 and is recommended for all new designs. It offers more reduction in the frequency amplitude peaks, and will support frequencies up to 140 MHz. The MK1704A generates a low EMI output clock from a clock input. The part is designed to dither the LCD interface clock or other clocks for flat panel graphics controllers. The MK1704A uses ICS/MicroClock's proprietary mixture of analog and digital Phase-Locked Loop (PLL) technology to synthesize the frequency, and our patented technique to spread the frequency spectrum of the output, thereby reducing the frequency amplitude peaks by several dB. We offer many other clocks for computers and computer peripherals. Consult us when you need to remove crystals and oscillators from your board.
MK1704A Low EMI Clock Generator
Features
* Packaged in 8 pin SOIC * Provides a spread spectrum output clock * Supports leading flat panel controllers * Accepts a clock input, provides same frequency dithered output * Optimized for higher resolutions that require up to 140 MHz, as well as 40 MHz (SVGA) and 65 MHz (XVGA) clocks * Peak reduction by 7dB - 14 dB typical on 3rd19th odd harmonics * Low EMI feature can be disabled * 3.3 V or 5 V 10% supply voltage * Advanced, low power CMOS process * See the MK1714-01 for a multiplier with low EMI which can operate from a crystal
Block Diagram
VDD GND S0 S1 Low EMI Enable
Crystal Oscillator
PLL Clock Synthesis and Spread Spectrum Circuitry
Output Buffer
Clock Out
Input Clock
1 Revision 062599 Printed 11/15/00 MicroClock Division of ICS * 525 Race Street * San Jose * CA * 95126*(408)295-9800tel*(408)295-9818fax
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Pin Assignment
MK1704A Low EMI Clock Generator
Clock Output Select Table (in MHz) ICLK VDD GND CLK 1 2 3 4 8 7 6 5 DC S0 S1 LEE
S1 0 0 1 1 S0 0 1 0 1 Min 60 60 30 40 Input Nom 135 80 40 65 Max Multiplier 140 x1 120 x1 60 x1 100 x1 Mode * * SVGA XGA Freq. spread vs. CLK +0.5, -1.5% +0.5, -1.5% Down 2.5% +0.5, -1.5%
8 pin SOIC
*Note: Use only MK1704A with date code of 9909 or later.
Pin Descriptions
Pin # 1 2 3 4 5 6 7 8 Name ICLK VDD GND CLK LEE S1 S0 DC Type Description I P P O I I I Connect to a clock input as shown in the table above. Connect to +3.3V or +5V. Connect to ground. Clock Output; equal to input frequency. Low EMI Enable. Turns on the spread spectrum when high. Internal pull-up. Frequency Select 1 Input. Selects input/output clock range per table above. Internal pull-up. Frequency Select 0 Input. Selects input/output clock range per table above. Internal pull-up. Don't Connect. Do not connect anything to this pin.
Key: I = Input, O = output, P = power supply connection
External Components
A minimum number of external components are required for proper operation. A decoupling capacitor of 0.01F should be connected between VDD and GND on pins 2 and 3, and a 33 terminating resistor may be used on the clock output if the trace is longer than 1 inch. The MK1704A is designed for use with a clock input only. For a crystal input, use the MK1704S or the MK1714-01R.
2 Revision 062599 Printed 11/15/00 MicroClock Division of ICS * 525 Race Street * San Jose * CA * 95126*(408)295-9800tel*(408)295-9818fax
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Electrical Specifications
MK1704A Low EMI Clock Generator
Parameter Conditions Minimum ABSOLUTE MAXIMUM RATINGS (note 1) Supply Voltage, VDD Referenced to GND Inputs Referenced to GND -0.5 Clock Outputs Referenced to GND -0.5 Ambient Operating Temperature 0 Soldering Temperature Max of 10 seconds Storage temperature -65 DC CHARACTERISTICS (at 5.0V unless otherwise noted) Operating Voltage, VDD 3 Input High Voltage, VIH, input clock only Clock input (VDD/2)+1 Input Low Voltage, VIL, input clock only Clock input Output High Voltage, VOH IOH=-4mA VDD-0.4 Output High Voltage, VOH IOH=-25mA 2.4 Output Low Voltage, VOL IOL=25mA Operating Supply Current, IDD, 5V No Load Operating Supply Current, IDD, 3.3V No Load Input Capacitance S0, S1 pins Internal Pull-up Resistor LEE pin only AC CHARACTERISTICS (at 5.0V unless otherwise noted) Input Clock Frequency S1=0, S0=0 60 (Note 3) S1=0, S0=1 60 S1=1, S0=0 30 S1=1, S0=1 40 Input Clock Duty Cycle Time above VDD/2 20 Output Clock Rise Time 0.8 to 2.0V Output Clock Fall Time 2.0 to 0.8V Output Clock Duty Cycle Time above 1.5V 40 Output Clock Frequency Variation from Mean 3rd-19th odd harmonics EMI Peak Frequency Reduction
Typical
Maximum 7 VDD+.5V VDD+.5V 70 260 150 5.5
Units V V V C C C V V V V V V mA mA pF k MHz
VDD/2 VDD/2
(VDD/2)-1
0.4 15 10 7 500 135 80 40 65 140 120 60 100 80 1.5 1.5 60
50 1 - 2.5 10 to 16
% ns ns % % dB
Notes: 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. Typical values are at 25C. 3. Not tested; guaranteed by design.
3 Revision 062599 Printed 11/15/00 MicroClock Division of ICS * 525 Race Street * San Jose * CA * 95126*(408)295-9800tel*(408)295-9818fax
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Package Outline and Package Dimensions 8 pin SOIC
MK1704A Low EMI Clock Generator
E Pin 1
H
D Q e b c
h x 45 A L
Symbol A b D E H e h L Q
Inches Min Max 0.055 0.068 0.013 0.019 0.185 0.200 0.150 0.160 0.225 0.245 .050 BSC 0.015 0.016 0.035 0.004 0.01
Millimeters Min Max 1.397 1.7272 0.330 0.483 4.699 5.080 3.810 4.064 5.715 6.223 1.27 BSC 0.381 0.406 0.889 0.102 0.254
Ordering Information
Part/Order Number MK1704A MK1704ATR Marking MK1704A MK1704A Package 8 pin SOIC Add tape and reel Temperature 0 to 70 C 0 to 70 C
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Inc. (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 062599 Printed 11/15/00 MicroClock Division of ICS * 525 Race Street * San Jose * CA * 95126*(408)295-9800tel*(408)295-9818fax
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