PLL Clock
Synthesis and
Spread Spectrum
Circuitry
MK1704A
Low EMI Clock Generator
MDS 1704A B
1
Revision 062599
Printed 11/15/00
MicroClock Division of ICS 525 Race Street San Jose CA 95126(408)295-9800tel(408)295-9818fax
I C R O
C
LOC K
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.
Block Diagram
Description
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 3rd-
19th 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
Crystal
Oscillator
VDD GND
S1
Output
Buffer
Clock Out
Input Clock
Low EMI
Enable
S0
MK1704A
Low EMI Clock Generator
MDS 1704A B
2
Revision 062599
Printed 11/15/00
MicroClock Division of ICS 525 Race Street San Jose CA 95126(408)295-9800tel(408)295-9818fax
I C R O
C
LOC K
Pin #
Name
Type Description
1
ICLK
I
Connect to a clock input as shown in the table above.
2
VDD
P
Connect to +3.3V or +5V.
3
GND
P
Connect to ground.
4
CLK
O
Clock Output; equal to input frequency.
5
LEE
I
Low EMI Enable. Turns on the spread spectrum when high. Internal pull-up.
6
S1
I
Frequency Select 1 Input. Selects input/output clock range per table above. Internal pull-up.
7
S0
I
Frequency Select 0 Input. Selects input/output clock range per table above. Internal pull-up.
8
DC
-
Don't Connect. Do not connect anything to this pin.
Pin Descriptions
Key: I = Input, O = output, P = power supply connection
Pin Assignment
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.
1
8
2
3
4
7
6
5
ICLK
S0
GND
DC
VDD
LEE
8 pin SOIC
CLK
S1
Clock Output Select Table (in MHz)
*Note: Use only MK1704A with date code of 9909 or later.
Input
Freq. spread
S1
S0
Min
Nom
Max Multiplier
Mode
vs. CLK
0
0
60
135
140
x1
*
+0.5, -1.5%
0
1
60
80
120
x1
*
+0.5, -1.5%
1
0
30
40
60
x1
SVGA
Down 2.5%
1
1
40
65
100
x1
XGA
+0.5, -1.5%
MK1704A
Low EMI Clock Generator
MDS 1704A B
3
Revision 062599
Printed 11/15/00
MicroClock Division of ICS 525 Race Street San Jose CA 95126(408)295-9800tel(408)295-9818fax
I C R O
C
LOC K
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.
Electrical Specifications
Parameter
Conditions
Minimum
Typical
Maximum
Units
ABSOLUTE MAXIMUM RATINGS (note 1)
Supply Voltage, VDD
Referenced to GND
7
V
Inputs
Referenced to GND
-0.5
VDD+.5V
V
Clock Outputs
Referenced to GND
-0.5
VDD+.5V
V
Ambient Operating Temperature
0
70
C
Soldering Temperature
Max of 10 seconds
260
C
Storage temperature
-65
150
C
DC CHARACTERISTICS (at 5.0V unless otherwise noted)
DC CHARACTERISTICS (at 5.0V unless otherwise noted)
Operating Voltage, VDD
3
5.5
V
Input High Voltage, VIH, input clock only
Clock input
(VDD/2)+1
VDD/2
V
Input Low Voltage, VIL, input clock only
Clock input
VDD/2
(VDD/2)-1
V
Output High Voltage, VOH
IOH=-4mA
VDD-0.4
V
Output High Voltage, VOH
IOH=-25mA
2.4
V
Output Low Voltage, VOL
IOL=25mA
0.4
V
Operating Supply Current, IDD, 5V
No Load
15
mA
Operating Supply Current, IDD, 3.3V
No Load
10
mA
Input Capacitance
S0, S1 pins
7
pF
Internal Pull-up Resistor
LEE pin only
500
k
AC CHARACTERISTICS (at 5.0V unless otherwise noted)
AC CHARACTERISTICS (at 5.0V unless otherwise noted)
Input Clock Frequency
S1=0, S0=0
60
135
140
MHz
(Note 3)
S1=0, S0=1
60
80
120
S1=1, S0=0
30
40
60
S1=1, S0=1
40
65
100
Input Clock Duty Cycle
Time above VDD/2
20
80
%
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
Time above 1.5V
40
50
60
%
Output Clock Frequency Variation from Mean
1 - 2.5
%
EMI Peak Frequency Reduction
3rd-19th odd harmonics
10 to 16
dB
MK1704A
Low EMI Clock Generator
MDS 1704A B
4
Revision 062599
Printed 11/15/00
MicroClock Division of ICS 525 Race Street San Jose CA 95126(408)295-9800tel(408)295-9818fax
I C R O
C
LOC K
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.
Package Outline and Package Dimensions
Inches
Inches
Millimeters
Millimeters
Symbol
Min
Max
Min
Max
A
0.055
0.068
1.397
1.7272
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 .050 BSC
.050 BSC
1.27 BSC
1.27 BSC
h
0.015
0.381
L
0.016
0.035
0.406
0.889
Q
0.004
0.01
0.102
0.254
8 pin SOIC
Ordering Information
Part/Order Number
Marking
Package
Temperature
MK1704A
MK1704A
8 pin SOIC
0 to 70 C
MK1704ATR
MK1704A
Add tape and reel
0 to 70 C
c
A
b
D
E
H
e
h x 45
Q
Pin 1
L
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