MK1704ATR [ICSI]
Low EMI Clock Generator; 低EMI时钟发生器
| 型号： | MK1704ATR |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | Low EMI Clock Generator |
| 文件： | 总4页 (文件大小：48K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MK1704A
Low EMI Clock Generator
ICR O CLOC K
Description
Features
• Packaged in 8 pin SOIC
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.
• Provides a spread spectrum output clock
• Supports leading flat panel controllers
• Accepts a clock input, provides same frequency
dithered output
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.
• 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
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
VDD GND
S0
S1
PLL Clock
Low EMI
Synthesis and
Spread Spectrum
Circuitry
Enable
Output
Buffer
Clock Out
Crystal
Oscillator
Input Clock
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
MK1704A
Low EMI Clock Generator
ICR O CLOC K
Pin Assignment
Clock Output Select Table (in MHz)
ICLK
VDD
GND
CLK
1
2
3
4
8
7
6
5
DC
S0
Input
Freq. spread
vs. CLK
S1
0
S0
0
Min Nom Max Multiplier Mode
60
60
30
40
135
80
140
120
60
x1
x1
x1
x1
*
*
+0.5, -1.5%
+0.5, -1.5%
Down 2.5%
+0.5, -1.5%
0
1
S1
1
0
40
SVGA
XGA
LEE
1
1
65
100
*Note: Use only MK1704A with date code of 9909 or later.
8 pin SOIC
Pin Descriptions
Pin # Name
Type Description
1
2
3
4
5
6
7
8
ICLK
VDD
GND
CLK
LEE
S1
I
P
P
O
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.
I
S0
I
DC
-
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
0.01µF should be connected between VDD and GND on pins 2 and 3, and a 33 Wterminating 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.
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
MK1704A
Low EMI Clock Generator
ICR O CLOC K
Electrical Specifications
Parameter
Conditions
Minimum
Typical
Maximum
Units
ABSOLUTE MAXIMUM RATINGS (note 1)
Supply Voltage, VDD
Inputs
Referenced to GND
Referenced to GND
Referenced to GND
7
VDD+.5V
VDD+.5V
70
V
V
-0.5
-0.5
0
Clock Outputs
V
Ambient Operating Temperature
Soldering Temperature
Storage temperature
°C
°C
°C
Max of 10 seconds
260
-65
150
DC CHARACTERISTICS (at 5.0V unless otherwise noted)
Operating Voltage, VDD
3
5.5
V
V
Input High Voltage, VIH, input clock only
Input Low Voltage, VIL, input clock only
Output High Voltage, VOH
Clock input
Clock input
IOH=-4mA
IOH=-25mA
IOL=25mA
No Load
(VDD/2)+1
VDD/2
VDD/2
(VDD/2)-1
V
VDD-0.4
2.4
V
Output High Voltage, VOH
V
Output Low Voltage, VOL
0.4
V
Operating Supply Current, IDD, 5V
Operating Supply Current, IDD, 3.3V
Input Capacitance
15
10
7
mA
mA
pF
kW
No Load
S0, S1 pins
LEE pin only
Internal Pull-up Resistor
500
AC CHARACTERISTICS (at 5.0V unless otherwise noted)
Input Clock Frequency
(Note 3)
S1=0, S0=0
60
60
30
40
20
135
80
140
120
60
MH z
S1=0, S0=1
S1=1, S0=0
40
S1=1, S0=1
65
100
80
Input Clock Duty Cycle
Time above VDD/2
0.8 to 2.0V
2.0 to 0.8V
%
ns
ns
%
Output Clock Rise Time
Output Clock Fall Time
Output Clock Duty Cycle
1.5
1.5
60
Time above 1.5V
40
50
Output Clock Frequency Variation from Mean
EMI Peak Frequency Reduction
1 - 2.5
10 to 16
%
dB
3rd-19th odd harmonics
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 25°C.
3. Not tested; guaranteed by design.
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
MK1704A
Low EMI Clock Generator
ICR O CLOC K
Package Outline and Package Dimensions
8 pin SOIC
Inches
Millimeters
Min Max
0.055 0.068 1.397 1.7272
Symbol Min
Max
A
b
E
H
0.013 0.019 0.330
0.185 0.200 4.699
0.150 0.160 3.810
0.225 0.245 5.715
0.483
5.080
4.064
6.223
Pin 1
D
E
H
e
.050 BSC
0.015
0.016 0.035 0.406
0.004 0.01 0.102
1.27 BSC
h
0.381
0.889
0.254
h x 45°
D
L
Q
A
Q
c
b
L
e
Ordering Information
Part/Order Number
MK1704A
Marking
MK1704A
MK1704A
Package
8 pin SOIC
Temperature
0 to 70 °C
0 to 70 °C
MK1704ATR
Add tape and reel
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.
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
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