DATASHEET
MK1707
LOW EMI CLOCK GENERATOR
Description
Features
The MK1707 generates a low EMI output clock from a clock
input. The part is designed to dither the LCD interface clock
for flat panel graphics controllers. The device uses IDT’s
proprietary mix of analog and digital Phase Locked Loop
(PLL) technology to spread the frequency spectrum of the
output, thereby reducing the frequency amplitude peaks by
several dB.
•
•
•
•
•
•
•
The MK1707 offers both centered and down spread from a
high speed clock input. Refer to the MK1714-01/02 for a
crystal input and the widest selection of input frequencies
and multipliers.
Packaged in 8-pin SOIC
Pb-free package
Industrial temperature range available
Provides a spread spectrum output clock
Supports ATI’s flat panel controllers
Guaranteed to +85° C operation
Accepts a clock input, provides same frequency dithered
output
• Good for all VGA modes from 80 to 167 MHz
• Peak reduction by 7dB - 14dB typical on 3rd - 19th odd
harmonics
IDT offers many other clocks for computers and computer
peripherals. Consult us when you need to remove crystals
and oscillators from your board.
•
•
•
•
Low EMI feature can be disabled
Includes Power-down
Operating voltage of 3.3 V or 5 V
Advanced, low-power CMOS process
Block Diagram
VDD
S1:0
2
Spread Direction
PLL Clock
Synthesis
and Spread
Spectrum
Circuitry
Low EMI Enable
ICLK
Clock Out
Input
Buffer
GND
IDT® LOW EMI CLOCK GENERATOR
1
MK1707
REV L 072312
MK1707
LOW EMI CLOCK GENERATOR
SSCG
Pin Assignment
Spread Direction and Percentage
Select Table
ICLK
1
8
SD
VDD
2
7
S1
GND
3
6
S0
CLK
4
5
LEE
SD
Pin 8
S1
Pin 7
S0
Pin 6
Spread
Direction
Spread
Percentage (%)
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0
0
0
M
M
M
1
1
1
0
0
0
M
M
M
1
1
1
0
M
1
0
M
1
0
M
1
0
M
1
0
M
1
0
M
1
Down
Down
Down
Down Center
Down
Down Center
Down Center
Down
Power Down
Center
Center
Center
Center
Center
Center
Test
Center
Power Down
0.6
0.8
1.25
+0.5, -1.5
2
+0.5, -2.5
+0.5, -3
5
±0.35
±0.5
±0.7
±0.8
±1.1
±1.4
Test
±2.5
-
8 pin (150 mil) SOIC
0 = connect to GND
M = unconnected (floating)
1 = connect directly to VDD
Pin Descriptions
Pin
Number
Pin
Name
Pin Type
1
ICLK
Input
Connect to graphics input clock.
2
VDD
Power
Connect to +3.3 V.
3
GND
Power
Connect to ground.
4
CLK
Output
Spread spectrum clock output per table above.
5
LEE
Input
Low EMI enable. Turns on spread spectrum when high. Internal pull-up resistor.
6
S0
Input
Function select 0 input. Selects spread amount and direction per table above.
Internal mid-level.
7
S1
Input
Function select 1input. Selects spread amount and direction per table above.
Internal mid-level.
8
SD
Input
Spread direction select input. Selects the direction of spread per table above.
Internal pull-up resistor.
IDT® LOW EMI CLOCK GENERATOR
Pin Description
2
MK1707
REV L 072312
MK1707
LOW EMI CLOCK GENERATOR
SSCG
External Components
Powerup Considerations
The MK1707 requires a minimum number of external
components for proper operation.
To insure proper operation of the spread spectrum
generation circuit, some precautions must be taken while
utilizing the MK1707.
Decoupling Capacitor
A decoupling capacitor of 0.01µF must be connected
between VDD and GND on pins 2 and 3, as close to these
pins as possible. For optimum device performance, the
decoupling capacitor should be mounted on the component
side of the PCB. Avoid the use of vias in the decoupling
circuit.
1. An input signal should not be applied to ICLK until VDD is
stable (within 10% of its final value). This requirement can
easily be met by operating the MK1707 and then ICLK
source from the same power supply.
2. LEE should not be enabled (taken high) until after the
power supplies and input clock are stable. This requirement
can be met by direct control of LEE by system logic - for
example, a “power good” signal. Another solution is to leave
LEE unconnected to anything but a 0.01μF capacitor to
ground. The internal pullup resistor on LEE will charge the
capacitor and provide approximately a 700μs delay until
spread spectrum is enabled.
Series Termination Resistor
When the PCB trace between the clock output and the load
is over 1 inch, series termination should be used. To series
terminate a 50Ω trace (a commonly used trace impedance),
place a 33Ω resistor in series with the clock line, as close to
the clock output pin as possible. The nominal impedance of
the clock output is 20Ω.
Tri-level Select Pin Operation
3. If the input frequency is changed during operation,
disable spread spectrum until the input clock stabilizes at
the new frequency.
The S1, S0 select pins are tri-level, meaning they have three
separate states to make the selections shown in the table on
page 2. To select the M (mid) level, the connection to these
pins must be eliminated by either floating them originally, or
tri-stating the GPIO pins which drive the select pins.
PCB Layout Recommendations
For optimum device performance and lowest output phase
noise, the following guidelines should be observed.
1) The 0.01µF decoupling capacitor should be mounted on
the component side of the board as close to the VDD pin as
possible. No vias should be used between the decoupling
capacitor and VDD pin. The PCB trace to VDD pin should
be kept as short as possible, as should the PCB trace to the
ground via.
2) To minimize EMI, the 33Ω series termination resistor (if
needed) should be placed close to the clock output.
3) An optimum layout is one with all components on the
same side of the board, minimizing vias through other signal
layers. Other signal traces should be routed away from the
MK1707. This includes signal traces just underneath the
device, or on layers adjacent to the ground plane layer used
by the device.
IDT® LOW EMI CLOCK GENERATOR
3
MK1707
REV L 072312
MK1707
LOW EMI CLOCK GENERATOR
SSCG
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK1707. These ratings, which are
standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these
or any other conditions above those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical
parameters are guaranteed only over the recommended operating temperature range.
Item
Rating
Supply Voltage, VDD
7V
All Inputs and Outputs
-0.5 V to VDD+0.5 V
Ambient Operating Temperature, Commercial
0 to +85° C
Ambient Operating Temperature, Industrial
-40 to +85° C
Storage Temperature
-65 to +150° C
Junction Temperature
125° C
Soldering Temperature
260° C
Recommended Operation Conditions
Parameter
Min.
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
Typ.
Max.
Units
0
+85
°C
+3.135
+5.5
V
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V, Ambient Temperature 0 to +85° C
Parameter
Symbol
Conditions
Min.
Typ.
3.135
Max.
Units
5.5
V
Operating Voltage
VDD
Supply Current
IDD
No load, at 3.3 V
20
mA
IDD
No load, at 5 V
31
mA
IDDPD
S0=S1=SD=1
60
μA
VDD/2
V
Input High Voltage
VIH
ICLK
Input Low Voltage
VIL
ICLK
Input High Voltage
VIH
S1, S0
Input High Voltage
VIH
other inputs
Input Low Voltage
VIL
S0, S1, SD, LEE pins
Output High Voltage
VOH
CMOS, IOH = -4 mA
Output High Voltage
VOH
IOH = -12 mA
Output Low Voltage
VOL
IOL = -12 mA
Input Capacitance
CIN
S0, S1, SD, LEE pins
IDT® LOW EMI CLOCK GENERATOR
(VDD/2) + 1
VDD/2
(VDD/2) - 1
VDD-0.5
V
2.5
V
0.5
V
VDD-0.4
V
2.4
V
0.4
4
V
5
V
pF
MK1707
REV L 072312
MK1707
LOW EMI CLOCK GENERATOR
SSCG
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V, Ambient Temperature 0 to +85° C
Parameter
Symbol
Conditions
Input/Output Clock Frequency
Min.
Typ.
Max. Units
80
167
MHz
80
%
60
%
Input Clock Duty Cycle
Time above VDD/2
20
Output Clock Duty Cycle
Time above 1.5 V
40
50
Output Rise Time
tOR
0.8 to 2.0 V
1.5
ns
Output Fall Time
tOF
2.0 to 0.8 V
1.5
ns
Modulation Frequency
EMI Peak Frequency Reduction
19
3rd - 19th odd
harmonics
41
7 to 14
kHz
dB
Thermal Characteristics
Parameter
Thermal Resistance Junction to
Ambient
Thermal Resistance Junction to Case
IDT® LOW EMI CLOCK GENERATOR
Symbol
Conditions
Min.
Typ.
Max. Units
θJA
Still air
150
° C/W
θJA
1 m/s air flow
140
° C/W
θJA
3 m/s air flow
120
° C/W
40
° C/W
θJC
5
MK1707
REV L 072312
MK1707
LOW EMI CLOCK GENERATOR
SSCG
Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Body)
Package dimensions are kept current with JEDEC Publication No. 95
8
Millimeters
Symbol
E
Min
A
A1
B
C
D
E
e
H
h
L
α
H
INDEX
AREA
1 2
D
A
Inches
Max
Min
1.35
1.75
0.10
0.25
0.33
0.51
0.19
0.25
4.80
5.00
3.80
4.00
1.27 BASIC
5.80
6.20
0.25
0.50
0.40
1.27
0°
8°
Max
.0532
.0688
.0040
.0098
.013
.020
.0075
.0098
.1890
.1968
.1497
.1574
0.050 BASIC
.2284
.2440
.010
.020
.016
.050
0°
8°
h x 45
A1
C
-Ce
B
SEATING
PLANE
L
.10 (.004)
C
Ordering Information
Part / Order Number
Marking
Shipping Packaging
Package
Temperature
MK1707SLF
MK1707SLFTR
MK1707SILF
MK1707SILFTR
MK1707SL
MK1707SL
MK1707IL
MK1707IL
Tubes
Tape and Reel
Tubes
Tape and Reel
8-pin SOIC
8-pin SOIC
8-pin SOIC
8-pin SOIC
0 to +85° C
0 to +85° C
-40 to +85° C
-40 to +85° C
Note: “LF” denotes Pb (lead) free package.
While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT) 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 IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT
does not authorize or warrant any IDT product for use in life support devices or critical medical instruments.
IDT® LOW EMI CLOCK GENERATOR
6
MK1707
REV L 072312
MK1707
LOW EMI CLOCK GENERATOR
SSCG
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