MK2712
NTSC/PAL Clock Source
MDS 2712 C
1
Revision 061401
Integrated Circuit Systems 525 Race Street San Jose CA 95126 (408)295-9800tel www.icst.com
The MK2712 is the ideal way to generate clocks for
NTSC/PAL video encoders and decoders. Stored in
the device are two sets of popular frequencies for
NTSC and PAL. In an 8 pin SOIC, the chip can save
component count, board space, and cost over surface
mount crystals and oscillators, and increase reliability
by eliminating one or two mechanical devices from the
board. The power down pin turns off the device,
drawing less than 20A.
ICS/MicroClock offers 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
Ideal for chips such as Analog Devices AD722
and Brooktree BT819
Input clock frequency of 27.0000 MHz
Power down turns off chip
Output enable tri-states output for system testing
Frequencies are within 1 ppm with accurate
input clock
Low jitter
Output clock frequencies of 14.31818MHz,
17.7345MHz, 28.6364MHz, or 35.46896MHz
25mA drive capability at TTL levels
3.3V or 5V supply voltage
Advanced, low power CMOS process
Insensitive to input clock duty cycle
VDD
GND
PLL
Clock Synthesis
Circuitry
27.00 MHz
clock input
Output
Buffer
NTSC/PALCL
OCK
FS0, 1
2
PD
OE
MK2712
NTSC/PAL Clock Source
MDS 2712 C
2
Revision 061401
Integrated Circuit Systems 525 Race Street San Jose CA 95126 (408)295-9800tel www.icst.com
Number
Name
Type
Description
Description
1
ICLK
I
Input Clock. Connect to a 27.0000 MHz clock.
Input Clock. Connect to a 27.0000 MHz clock.
2
VDD
P
Connect to +3.3V or +5V.
Connect to +3.3V or +5V.
3
GND
P
Connect to ground.
Connect to ground.
4
NPCLK
O
NTSC or PAL output clock. Selected by FS1, FS0 per tables above.
NTSC or PAL output clock. Selected by FS1, FS0 per tables above.
5
FS1
I
Frequency Select pin #1. Selects NTSC or PAL frequency per table above.
Frequency Select pin #1. Selects NTSC or PAL frequency per table above.
6
OE
I
Output Enable. Tri-states clock output when this input is low. Internal pull-up.
Output Enable. Tri-states clock output when this input is low. Internal pull-up.
7
PD
I
Power Down. Active low. Clocks stop low.
Power Down. Active low. Clocks stop low.
8
FS0
I
Frequency Select pin #0. Selects NTSC or PAL frequency per table above.
Frequency Select pin #0. Selects NTSC or PAL frequency per table above.
Pin Descriptions
Key: I = Input, O = output, P = power supply connection
Pin Assignment
External Components/Crystal Selection
A minimum number of external components are required for proper oscillation. Connect a 27.000 MHz clock to
ICLK. A decoupling capacitor of 0.1F should be connected between VDD and GND on pins 2 and 3, and a 33
terminating resistor should be used on the clock output if the trace is longer than 1 inch.
1
8
2
3
4
7
6
5
ICLK
FS0
GND
PD
VDD
OE
8 pin SOIC
NPCLK
Decoding Table
FS1
FS0
NPCLK (MHz)
Error (ppm)
0
0
14.31818
0.3 ppm
0
1
17.73447
0.3 ppm
1
0
28.63636
0.3 ppm
1
1
35.46894
0.3 ppm
FS1
MK2712
NTSC/PAL Clock Source
MDS 2712 C
3
Revision 061401
Integrated Circuit Systems 525 Race Street San Jose CA 95126 (408)295-9800tel www.icst.com
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.
Electrical Specifications
Parameter
Conditions
Minimum
Typical
Maximum
Units
ABSOLUTE MAXIMUM RATINGS (note 1)
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
4.5
5.5
V
Input High Voltage, VIH, input clock only
ICLK pin
3.5
2.5
V
Input Low Voltage, VIL, input clock only
ICLK pin
2.5
1.5
V
Input High Voltage, VIH
2
V
Input Low Voltage, VIL
0.8
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
No Load, FS1=1. FS0=1
13
mA
Power Down Supply Current, IDDPD
No Load
10
A
Input Capacitance
5
pF
Actual Mean Frequency versus Target
With exact ICLK
0.3
0.3
ppm
AC CHARACTERISTICS (at 5.0V unless otherwise noted)
AC CHARACTERISTICS (at 5.0V unless otherwise noted)
Input Clock Frequency
27
MHz
Input Clock Duty Cycle
Time above 2.5V
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
%
Absolute Maximum Clock Period Jitter, 15 pF
Variation from mean
90
ps
One Sigma Clock Period Jitter, 15 pF load
30
ps
Absolute Maximum Clock Period Jitter, 15 pF
VDD=3.3V
180
ps
One Sigma Clock Period Jitter, 15 pF load
VDD=3.3V
50
ps
MK2712
NTSC/PAL Clock Source
MDS 2712 C
4
Revision 061401
Integrated Circuit Systems 525 Race Street San Jose CA 95126 (408)295-9800tel www.icst.com
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
0.061
1.397 1.5494
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
MK2712S
MK2712S
8 pin SOIC
0-70C
MK2712STR
MK2712S
Add tape and reel
0-70C
c
A
b
D
E
H
e
h x 45
Q
Pin 1
L
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