MK1704SLF [IDT]
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| 型号： | MK1704SLF |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | 暂无描述 |
| 文件： | 总4页 (文件大小：54K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MK1704
Low EMI Clock Generator
ICROCLOCK
Description
Features
• Packaged in 8 pin SOIC
The MK1704 generates a low EMI output clock
from clock input. The part is designed to dither
the LCD interface clock or other clocks for flat
panel graphics controllers. The device 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.
• Provides a spread spectrum output clock
• Supports leading flat panel controllers
• Accepts a clock input, provides same frequency
dithered output
• Optimized for 40 (SVGA) and 65 MHz (XVGA)
clocks
• MK1704A designed for higher resolutions that
require 80 MHz and 135 MHz
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 135 MHz.
• Peak reduction by 7dB - 14 dB typical on 3rd-
19th odd harmonics
• Low EMI feature can be disabled
• 3.3 V or 5 V 10ꢀ supply voltage
• Advanced, low power CMOS process
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
X1
Crystal
Oscillator
Input Clock
or Crystal
X2
MDS1704F
1
Revision 4298
Printed 4/29/98
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
MK1704
Low EMI Clock Generator
ICROCLOCK
Pin Assignment
Clock Output Select Table (in MHz)
X1/ICLK
VDD
1
2
3
4
8
7
6
5
X2
S0
S1
S0
Input
pin 1
80
CLK
pin 4
80
Mode
Frequency spread
vs. CLK
pin 6 pin 7
0
0
1
1
0
1
0
1
*
Down 1.25ꢀ
Down 1.25ꢀ
Down 2.5ꢀ
Down 1.25ꢀ
135
40
135
40
*
GND
S1
SVGA
XGA
CLK
65
65
LEE
*Note: Only the MK1704A is designed for operation
at these higher frequencies. Either the MK1704S or
MK1704A may be used for SVGA and XGA.
8 pin SOIC
Pin Descriptions
Pin # Name
Type Description
1
2
3
4
5
6
7
8
X1/ICLK
VDD
GND
CLK
LEE
S1
I
P
P
O
I
Connect to a crystal or clock as shown in the table above.
Connect to +3.3V or +5V.
Connect to ground.
Clock Output per table above.
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.
Frequency Select 0 Input. Selects input/output clock range per table above.
Crystal Connection. Leave unconnected for a clock input.
I
S0
I
X2
O
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
0.1µF should be connected between VDD and GND on pins 2 and 3, and a 33Wterminating resistor may
be used on the clock output if the trace is longer than 1 inch. Operation with a crystal requires a parallel
resonant, fundamental mode crystal. Consult MicroClock for more infomation if a crystal is used instead
of a clock input.
MDS1704F
2
Revision 4298
Printed 4/29/98
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
MK1704
Low EMI Clock Generator
ICROCLOCK
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
(VDD/2)+1
VDD/2
VDD/2
Clock input
IOH=-4mA
IOH=-25mA
IOL=25mA
No Load
(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
No Load
S0, S1 pins
AC CHARACTERISTICS (at 5.0V unless otherwise noted)
Input Clock Frequency, MK1704S
40 - 65
40-135
MHz
MHz
ꢀ
Input Clock Frequency, MK1704A
Input Clock Duty Cycle
Time above VDD/2
20
40
80
1.5
1.5
60
Output Clock Rise Time
0.8 to 2.0V
ns
Output Clock Fall Time
2.0 to 0.8V
ns
Output Clock Duty Cycle
Time above 1.5V
50
ꢀ
Output Clock Frequency Variation from Mean
EMI Peak Frequency Reduction, MK1704S
EMI Peak Frequency Reduction, MK1704A
1 - 2.5
7 to 14
10 to 16
ꢀ
3rd-19th odd harmonics
3rd-19th odd harmonics
dB
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 25°C.
MDS1704F
3
Revision 4298
Printed 4/29/98
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
MK1704
Low EMI Clock Generator
ICROCLOCK
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
0.01
1.27 BSC
h
0.381
0.254
h x 45°
D
Q
0.004
0.102
A
Q
c
b
e
Ordering Information
Part/Order Number
MK1704S
Marking
MK1704S
MK1704S
MK1704A
MK1704A
Package
Temperature
0 to 70 C
0 to 70 C
0 to 70 C
0 to 70 C
8 pin SOIC
MK1704STR
MK1704A
Add tape and reel
8 pin SOIC
MK1704ATR
Add tape and reel
While the information presented herein has been checked for both accuracy and reliability, ICS MicroClock 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 MicroClock. ICS MicroClock reserves the right to change any circuitry or specifications without notice. ICS MicroClock
does not authorize or warrant any ICS MicroClock product for use in life support devices or critical medical instruments.
MDS1704F
4
Revision 4298
Printed 4/29/98
MicroClock Division of ICS•1271 Parkmoor Ave.•San Jose•CA•95126•(408)295-9800tel•(408)295-9818fax
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