MK2712 [ICSI]
NTSC/PAL Clock Source; NTSC / PAL时钟源
| 型号： | MK2712 |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | NTSC/PAL Clock Source |
| 文件： | 总4页 (文件大小：60K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MK2712
NTSC/PAL Clock Source
Description
Features
• Packaged in 8 pin SOIC
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 20µA.
• 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
ICS/MicroClock offers many other clocks for computers
and computer peripherals. Consult us when you need
to remove crystals and oscillators from your board.
• 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
Block Diagram
VDD
2
GND
FS0, 1
PD
PLL
Clock Synthesis
Circuitry
Output
Buffer
NTSC/PALCL
OCK
27.00 MHz
clock input
OE
MDS 2712 C
1
Revision 061401
Integrated Circuit Systems • 525 Race Street • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com
MK2712
NTSC/PAL Clock Source
Pin Assignment
Decoding Table
1
8
7
6
5
FS0
PD
FS1
0
FS0
0
NPCLK (MHz)
14.31818
17.73447
28.63636
35.46894
Error (ppm)
0.3 ppm
0.3 ppm
0.3 ppm
0.3 ppm
ICLK
2
3
4
VDD
GND
0
1
1
0
OE
1
1
FS1
NPCLK
8 pin SOIC
Pin Descriptions
Number Name
Type Description
1
2
3
4
5
6
7
8
ICLK
VDD
GND
NPCLK
FS1
I
P
P
O
I
Input Clock. Connect to a 27.0000 MHz clock.
Connect to +3.3V or +5V.
Connect to ground.
NTSC or PAL output clock. Selected by FS1, FS0 per tables above.
Frequency Select pin #1. Selects NTSC or PAL frequency per table above.
Output Enable. Tri-states clock output when this input is low. Internal pull-up.
Power Down. Active low. Clocks stop low.
OE
I
PD
I
FS0
I
Frequency Select pin #0. Selects NTSC or PAL frequency per table above.
Key: I = Input, O = output, P = power supply connection
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 0.1µF should be connected between VDD and GND on pins 2 and 3, and a 33W
terminating resistor should be used on the clock output if the trace is longer than 1 inch.
MDS 2712 C
2
Revision 061401
Integrated Circuit Systems • 525 Race Street • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com
MK2712
NTSC/PAL Clock Source
Electrical Specifications
Parameter
Conditions
Minimum Typical Maximum Units
ABSOLUTE MAXIMUM RATINGS (note 1)
Supply Voltage, VDD
Inputs
Referenced to GND
7
VDD+.5V
VDD+.5V
70
V
Referenced to GND
Referenced to GND
-0.5
-0.5
0
V
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
4.5
3.5
5.5
1.5
0.8
V
V
Input High Voltage, VIH, input clock only
Input Low Voltage, VIL, input clock only
Input High Voltage, VIH
ICLK pin
ICLK pin
2.5
2.5
V
2
V
Input Low Voltage, VIL
V
Output High Voltage, VOH
IOH=-4mA
VDD-0.4
2.4
V
Output High Voltage, VOH
IOH=-25mA
V
Output Low Voltage, VOL
IOL=25mA
0.4
0.3
V
Operating Supply Current, IDD
Power Down Supply Current, IDDPD
Input Capacitance
No Load, FS1=1. FS0=1
No Load
13
10
5
mA
µA
pF
ppm
Actual Mean Frequency versus Target
With exact ICLK
0.3
AC CHARACTERISTICS (at 5.0V unless otherwise noted)
Input Clock Frequency
27
MHz
%
Input Clock Duty Cycle
Time above 2.5V
0.8 to 2.0V
20
40
80
1.5
1.5
60
Output Clock Rise Time
ns
ns
%
Output Clock Fall Time
2.0 to 0.8V
Output Clock Duty Cycle
Time above 1.5V
Variation from mean
50
± 90
30
Absolute Maximum Clock Period Jitter, 15 pF
One Sigma Clock Period Jitter, 15 pF load
Absolute Maximum Clock Period Jitter, 15 pF
ps
ps
ps
ps
VDD=3.3V
± 180
50
One Sigma Clock Period Jitter, 15 pF load VDD=3.3V
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.
MDS 2712 C
3
Revision 061401
Integrated Circuit Systems • 525 Race Street • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com
MK2712
NTSC/PAL Clock Source
Package Outline and Package Dimensions
8 pin SOIC
Inches
Symbol Min Max
Millimeters
Min Max
A
b
0.055 0.061 1.397 1.5494
0.013 0.019 0.330 0.483
0.185 0.200 4.699 5.080
0.150 0.160 3.810 4.064
0.225 0.245 5.715 6.223
E
H
Pin 1
D
E
H
e
.050 BSC
0.015
1.27 BSC
0.381
h
h x 45°
L
0.016 0.035 0.406 0.889
0.004 0.01 0.102 0.254
Q
A
Q
c
b
e
L
D
Ordering Information
Part/Order Number
MK2712S
Marking
Package
8 pin SOIC
Add tape and reel
Temperature
0-70°C
MK2712S
MK2712S
MK2712STR
0-70°C
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
extendedtemperaturerange,highreliability,orotherextraordinaryenvironmentalrequirementsarenotrecommendedwithoutadditionalprocessingby
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 2712 C
4
Revision 061401
Integrated Circuit Systems • 525 Race Street • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com
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