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MK1714-02 Spread Spectrum Multiplier Clock
Description
The MK1714-02 is a low cost, high performance clock synthesizer with selectable multipliers and spread amounts (percentages), designed to generate high frequency clocks with low EMI. Using analog/digital Phase-Locked Loop (PLL) techniques, the device accepts an inexpensive, fundamental mode, parallel resonant crystal, or a clock input to produce a spread, or dithered, output, thereby reducing the frequency amplitude peaks by several dB. The OE pin puts both outputs into a high impedance state for board level testing. The PD# pin powers down the entire chip, and the outputs are held low.
Features
* Packaged in 20 pin tiny SSOP (QSOP) * Operating VDD of 3.3 V or 5 V * Multiplier modes of x1, x2, x3, x4, x5, and x6 * Inexpensive 10-25 MHz crystal, or clock input * OE pin tri-states the outputs for testing * Power down pin stops the outputs low * Selectable frequency spread * Spread can be turned on or off * Duty cycle of 40/60 * Advanced, low power CMOS process * Industrial temperature range available
Block Diagram
VDD 5 PLL Clock Multiplier and Spread Spectrum Circuitry
X1
GND
S4:0 PD Low EMI Enable Input crystal or clock
Output Buffer
Clock Out
Crystal Oscillator
X2
Output Buffer
REF
XSEL
OE (both outputs)
1 Revision 120400 Integrated Circuit Systems, Inc. * 525 Race Street * San Jose *CA*95126* (408) 295-9800tel * www.icst.com
MDS 1714-02 C
MK1714-02 Spread Spectrum Multiplier Clock
Pin Assignment
X2 X1/ICLK VDD VDD S4 S3 GND GND S2 CLK 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 REF OE PD GND S0 NC S1 GND LEE XSEL
20 pin.150 mil SSOP (QSOP) Pin Descriptions
Pin # 1 2 3 4 5 6
7
8 9 10 11 12 13
14
15 16 17 18 19 20
Name X2 X1/ICLK VDD VDD S4 S3 GND GND S2 CLK XSEL LEE GND S1 NC S0 GND PD OE REF
Type XO XI P P I(D) I P P I O I I P I I P I I O
Description Crystal connection. Connect to parallel mode crystal. Leave open for clock. Crystal connection. Connect to parallel mode crystal, or clock. Connect to VDD. Must be same value as other VDD. Connect to VDD. Must be same value as other VDD. Decouple with pin 7. Select pin number 4. Determines multiplier and spread amount per table on following page. Select pin number 3. Determines multiplier and spread amount per table on following page. Connect to ground. Connect to ground. Select pin number 2. Determines multiplier and spread amount per table on following page. Clock output which depends on the input, multiplier and spread amount per table on page 3. Connect to VDD for crystal input, or GND for CLK input. Low EMI Enable. Turns on the Spread spectrum when high. Connect to ground. Select pin number 1. Determines multiplier and spread amount per table on following page. No Connect. Select pin number 0. Determines multiplier and spread amount per table on following page. Connect to ground. Power Down. Turns off the chip when low. Outputs stop low. Output Enable. Tri-states all outputs when low. Reference clock output from crystal oscillator.
Key: I = Input with internal pull-up; I(D) = Input with internal pull-down; XO/XI = crystal connections; O = output; P = power supply connection MDS 1714-02 C 2 Revision 120400 Integrated Circuit Systems, Inc. * 525 Race Street * San Jose *CA*95126* (408) 295-9800tel * www.icst.com
MK1714-02 Spread Spectrum Multiplier Clock
Clock Output Select Table (in MHz) S4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 S3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 S2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 S1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 S0 Input Range 0 40-80 1 60-120 0 40-80 1 80-150 0 10-30 1 20-60 0 10-25 1 20-60 0 20-30 1 40-75 0 40-100 1 40-75 0 20-40 1 20-60 0 10-20 1 10-30 0 20-37.5 1 20-40 0 10-30 1 20-30 0 5-20 1 20-50 0 20-37.5 1 80-150 0 10-25 1 10-20 0 10-20 1 20-50 0 10-25 1 10-20 0 10-20 1 10-30 Multiplier x1 x1 x1 x1 x2 x2 x2 x2 x3 x2 x1 x2 x1 x1 x1 x1 x4 x3 x1 x1 x2 x3 x4 x1 x4 x5 x6 x1 x4 x5 x6 x1 Output Range Direction Amount (%) 3.3/5V 40-80 C 0.75 Both 60-120 DC +0.25, -0.75 Both 40-80 C 1.25 Both 80-150 C 0.75 Both 20-60 C 0.75 Both 40-120 C 0.5 Both 20-50 DC +0.25, -1.5 Both 40-120 DC +0.5, -1.0 Both 60-90 C 0.5 Both 80-150 C 0.75 Both 40-100 DC +0.25, -1.5 Both 80-150 DC +0.25, -1.5 Both 20-40 DC +0.5, -2.0 3.3 V 20-60 DC +0.25, -1.5 Both 10-20 DC +0.5, -2.0 Both 10-30 DC +0.25, -1.5 Both 80-150 DC +0.25, -1.25 Both 60-120 DC +0.25, -1.5 Both 10-30 C 0.75 Both 20-30 D -0.5 Both 10-40 DC +0.25, -2.25 3.3 V 60-150 D -0.25, -2.25 Both 80-150 C 0.75 Both 80-150 DC +0.25, -1.25 Both 40-100 C 0.75 Both 50-100 C 0.75 Both 60-120 C 0.75 Both 20-50 C 0.75 Both 40-100 DC +0.25, -1.5 Both 50-100 DC +0.25, -1.25 Both 60-120 D -1.5 Both 10-30 C 0.75 Both
For S4:S0, 0 = connect to GND, 1 = connect to VDD. Direction: C=Center spread, D=Down spread, DC=Down+Center spread. Amount equals the spread amount. So for a 40 MHz output clock spread down 1%, the lowest frequency is 39.60 MHz. Contact ICS with your exact output frequency for details on spread direction and amount.
3 Revision 120400 Integrated Circuit Systems, Inc. * 525 Race Street * San Jose *CA*95126* (408) 295-9800tel * www.icst.com
MDS 1714-02 C
MK1714-02 Spread Spectrum Multiplier Clock
Electrical Specifications
Parameter Supply voltage, VDD Inputs and Clock Outputs Ambient Operating Temperature Soldering Temperature Storage temperature Operating Voltage, VDD Input High Voltage, VIH, X1/ICLK only Input Low Voltage, VIL, X1/ICLK only Input High Voltage, VIH Input Low Voltage, VIL Output High Voltage, VOH Output Low Voltage, VOL Output High Voltage, VOH, VDD = 3.3 or 5V Operating Supply Current, IDD, at 5V Operating Supply Current, IDD, at 3.3V Short Circuit Current, VDD = 3.3 Input Capacitance Internal Pull-up or Pull-down Resistor Conditions Referenced to GND Referenced to GND MK1714-02RI only Max of 10 seconds Minimum Typical Maximum 7 VDD+0.5 70 85 260 150 5.5 VDD/2 VDD/2 VDD/2 - 1 0.8 0.4 40 26 50 7 500 Units V V C C C C V V V V V V V V mA mA mA pF k
ABSOLUTE MAXIMUM RATINGS (note 1)
-0.5 0 -40 -65 3.0 Clock input VDD/2 + 1 Clock input Select inputs, OE, PD 2 Select inputs, OE, PD VDD=3.3V, IOH=-8mA 2.4 VDD=3.3V, IOL=8mA IOH=-8mA VDD-0.4 No Load, note 2 No Load, note 2 Each output Except X1, X2 Except X1
DC CHARACTERISTICS (VDD = 3.3V or 5V unless noted)
AC CHARACTERISTICS (VDD = 3.3V or 5V unless noted)
Input Crystal Frequency 10 25 MHz Input Clock Frequency See page 3 10 150 MHz Output Clock Rise Time 0.8 to 2.0V, no load 1.5 ns Output Clock Fall Time 2.0 to 0.8V, no load 1.5 ns Output Clock Duty Cycle At VDD/2 40 50 60 % One Sigma Jitter, CLK 40 ps Absolute Jitter, CLK 160 ps 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. Multiplier of x1, all clocks at highest frequencies.
External Components
The MK1714 requires a minimum number of external components for proper operation. Decoupling capacitors of 0.01F should be connected between VDD and GND (on pins 4 and 7), as close to the chip as possible. A series termination resistor of 33 may be used for each clock output. The crystal must be connected as close to the chip as possible. The crystal should be a fundamental mode and parallel resonant. If accurate tuning is required, crystal capacitors should be connected from pins X1 to ground and X2 to ground. The value of these capacitors is given by the following equation, where CL is the crystal load capacitance: Crystal caps (pF) = (CL -6) x 2. So for a crystal with 20pF load capacitance, two 28 pF caps should be used. If a clock input is used, drive it into X1 and leave X2 unconnected. MDS 1714-02 C 4 Revision 120400 Integrated Circuit Systems, Inc. * 525 Race Street * San Jose *CA*95126* (408) 295-9800tel * www.icst.com
MK1714-02 Spread Spectrum Multiplier Clock
Package Outline and Package Dimensions (For current dimensional specifications, see JEDEC Publication No. 95.)
20 pin SSOP
Symbol A A1 b c D e E E1 L Inches Min Max 0.053 0.069 0.004 0.010 0.008 0.012 0.007 0.010 0.337 0.344 .025 BSC 0.228 0.244 0.150 0.157 0.016 0.050 Millimeters Min Max 1.35 1.75 0.10 0.25 0.20 0.30 0.19 0.25 8.56 8.74 0.65 BSC 5.79 6.20 3.81 3.99 0.41 1.27
E1
E
INDEX AREA
1
2 D
A1 e b
c L
A
Ordering Information
Part/Order Number MK1714-02R MK1714-02RTR MK1714-02RI MK1714-02RITR Marking MK1714-02R MK1714-02R MK1714-02RI MK1714-02RI Package 20 pin SSOP 20 pin SSOP 20 pin SSOP 20 pin SSOP Shipping Tubes Tape and Reel Tubes Tape and Reel Temperature 0 to 70 C 0 to 70 C -40 to 85 C -40 to 85 C
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.
5 Revision 120400 Integrated Circuit Systems, Inc. * 525 Race Street * San Jose *CA*95126* (408) 295-9800tel * www.icst.com
MDS 1714-02 C

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