MK1728-01GTRLF [IDT]
Clock Generator, 36MHz, CMOS, PDSO8, TSSOP-8;
| 型号： | MK1728-01GTRLF |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | Clock Generator, 36MHz, CMOS, PDSO8, TSSOP-8 时钟 光电二极管 外围集成电路 晶体 |
| 文件： | 总8页 (文件大小：210K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DATASHEET
2.5 VOLT LOW EMI CLOCK GENERATOR
MK1728-01
Description
Features
The MK1728-01 generates a low EMI output clock from a
clock or crystal input. Operating at 2.5 V, the part is
designed to dither the LCD interface clock for PDAs,
printers, scanners, modems, copiers, and others. Using
ICS’ proprietary mix of analog and digital Phase-Locked
Loop (PLL) technology, the device spreads the frequency
spectrum of the output, reducing the frequency amplitude
peaks by several dB. The MK1728-01 offers both centered
and down spread from a high-speed clock input.
• Operating voltage of 2.5 V
• Packaged in 8-pin SOIC/TSSOP
• Provides a spread spectrum (Center and down spread)
clock output
• Accepts a clock or crystal input (provides same
frequency dithered output)
• Input frequency range of 4 to 36 MHz
• Output frequency range of 4 to 36 MHz
(1X Multiplier)
ICS offers many other clocks for computers and computer
peripherals. Consult ICS when you need to remove crystals
and oscillators from your board.
• Peak reduction by 8 dB to 16 dB typical on 3rd through
19th odd harmonics
• Low EMI feature can be disabled
• 3.3 V tolerant inputs (S0,S1, FRSEL, X1)
• Advanced, low-power CMOS process
• Not recommended for new designs. Use the
MK1728A-01 for new designs
Block Diagram
VDD
2
S1:0
PLL Clock
Synthesis
and Spread
FRSEL
Spectrum
Circuitry
SSCLK
X1/CLK
X2
X1
Clock Buffer/
Crystal
Ocsillator
External caps required with crystal for
accurate tuning of the clock
GND
IDT™ / ICS™ 2.5 VOLT LOW EMI CLOCK GENERATOR
1
MK1728-01
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MK1728-01
2.5 VOLT LOW EMI CLOCK GENERATOR
SSCG
Pin Assignment
Spread Direction and Percentage
Select Table
S1
S0
Spread
Direction
Spread
Percentage
8
7
6
5
X1/ICLK
S1
X2
VDD
1
2
3
4
Pin 3 Pin 4
0
0
0
M
1
Center
Center
Center
Center
No Spread
Down
±0.5
±1.0
±1.5
±2.0
-
GND
SSCLK
S0
0
FRSEL
M
M
M
1
0
M
1
8 pin (150 mil) SOIC/TSSOP
-0.5
-1.0
-1.5
-2.0
0
Down
1
M
1
Down
1
Down
FRSEL
(pin 6)
Input
Freq. Range
Multiplier
Output
Freq. Range
4.0 to 8.0 MHz
8.0 to 16.0MHz
16.0 to 36.0MHz
0
1
4.0 to 8.0 MHz
8.0 to 16.0MHz
16.0 to 36.0MHz
X1
X1
X1
M
0 = connect to GND
M = unconnected (floating)
1 = connect directly to VDD
Pin Descriptions
Pin
Pin
Pin Type
Pin Description
Number
Name
1
2
3
4
5
X2
VDD
GND
FRSEL
S0
XO
Crystal connection to a 4 to 36 MHz crystal. Leave unconnected for clock.
Power Connect to +2.5 V.
Power Connect to ground.
Input
Input
Function select for input frequency range. Default to mid-level “M”.
Function select 0 input. Selects spread amount and direction per table above
(default-internal mid-level).
6
7
SSCLK
S1
Output Clock output with spread spectrum.
Input
Function select 1 input. Selects spread amount and direction per table above
(default-internal mid-level).
8
X1/ICLK
Input
Connect to a 4 to 36 MHz crystal or clock.
IDT™ / ICS™ 2.5 VOLT LOW EMI CLOCK GENERATOR
2
MK1728-01
REV A 081204
MK1728-01
2.5 VOLT LOW EMI CLOCK GENERATOR
SSCG
External Components
The MK1728-01 requires a minimum number of external
components for proper operation.
same side of the board, minimizing vias through other signal
layers. Other signal traces should be routed away from the
MK1728-01. This includes signal traces just underneath the
device, or on layers adjacent to the ground plane layer used
by the device.
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.
Crystal Information
The crystal used should be a fundamental mode (do not use
third overtone), parallel resonant. Crystal capacitors should
be connected from pins X1 to ground and X2 to ground to
optimize the initial accuracy. The value of these capacitors
is given by the following equation:
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.
Crystal caps (pF) = (C - 6) x 2
L
In the equation, C is the crystal load capacitance. So, for a
L
crystal with a 16 pF load capacitance, two 20 pF [(16-6) x 2]
capacitors should be used.
Tri-level Select Pin Operation
The S1 and 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.
Spread Spectrum Profile
The MK1728-01 low EMI clock generator uses an optimized
frequency slew rate algorithm to facilitate down stream
tracking of zero delay buffers and other PLL devices. The
frequency modulation amplitude is constant with variations
of the input frequency.
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.
Modulation Rate
2) To minimize EMI, the 33Ω series termination resistor (if
needed) should be placed close to the clock output.
Time
3) An optimum layout is one with all components on the
IDT™ / ICS™ 2.5 VOLT LOW EMI CLOCK GENERATOR
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MK1728-01
REV A 081204
MK1728-01
2.5 VOLT LOW EMI CLOCK GENERATOR
SSCG
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK1728-01. These ratings, which are
standard values for ICS 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
All Inputs and Outputs
7 V
-0.5 V to VDD+0.5 V
0 to +70°C
-65 to +150°C
125°C
Ambient Operating Temperature
Storage Temperature
Junction Temperature
Soldering Temperature
260°C
Recommended Operation Conditions
Parameter
Min.
Typ.
Max.
+70
Units
°C
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
0
+2.375
2.5
2.625
V
DC Electrical Characteristics
Unless stated otherwise, VDD = 2.5 V, Ambient Temperature 0 to +70°C
Parameter
Operating Voltage
Supply Current
Symbol
VDD
Conditions
Min.
Typ.
2.5
Max.
Units
2.375
2.625
15
V
IDD
No load, at 2.5 V,
Fin=32 MHz
10
mA
Input Frequency
4
36
VDD
MHz
V
Input High Voltage
Input Middle Voltage
Input Low Voltage
Output High Voltage
Output Low Voltage
Input Capacitance
V
VDD-0.6
VDD-1.8
0.0
IH
V
VDD-0.7
0.6
V
IM
V
V
IL
V
I
I
= -4 mA
= 10 mA
2.0
V
OH
OH
V
0.4
6
V
OL
IN1
IN2
OL
C
C
S0, S1, FRSEL pins
X1, X2 pins
4
6
pF
pF
9
IDT™ / ICS™ 2.5 VOLT LOW EMI CLOCK GENERATOR
4
MK1728-01
REV A 081204
MK1728-01
2.5 VOLT LOW EMI CLOCK GENERATOR
SSCG
AC Electrical Characteristics
Unless stated otherwise, VDD = 2.5 V, C =15 pF, Ambient Temperature 0 to +70° C
L
Parameter
Input Clock Frequency
Output Clock Frequency
Input Clock Duty Cycle
Output Clock Duty Cycle
Cycle to Cycle Jitter
Symbol
Conditions
Min.
4
Typ. Max. Units
36
36
MHz
MHz
%
4
Time above VDD/2
Time above 1.25 V
45
40
55
50
60
%
Fin=(4-8) MHz,
Fout=(4-8) MHz
200
300
ps
Fin =(8-36) MHz,
Fout = (8-36) MHz
200
300
ps
Output Rise Time
t
20% to 80% of VDD
80% to 20% of VDD
Fin=24 MHz
1
1
1.82
1.82
2.62
2.62
ns
ns
R
Output Fall Time
t
F
Modulation Rate
F
32
kHz
dB
MOD
EMI Peak Frequency Reduction
8 to 16
Thermal Characteristics – 8 SOIC
Parameter
Symbol
Conditions
Min.
Typ. Max. Units
Thermal Resistance Junction to
Ambient
θ
θ
θ
θ
Still air
150
140
120
40
°C/W
°C/W
°C/W
°C/W
JA
JA
JA
JC
1 m/s air flow
3 m/s air flow
Thermal Resistance Junction to Case
Thermal Characteristics – 8 TSSOP
Parameter
Symbol
Conditions
Still air
Min.
Typ. Max. Units
Thermal Resistance Junction to
Ambient
θ
θ
θ
θ
110
100
80
°C/W
°C/W
°C/W
°C/W
JA
JA
JA
JC
1 m/s air flow
3 m/s air flow
Thermal Resistance Junction to Case
35
IDT™ / ICS™ 2.5 VOLT LOW EMI CLOCK GENERATOR
5
MK1728-01
REV A 081204
MK1728-01
2.5 VOLT LOW EMI CLOCK GENERATOR
SSCG
Package Outline and Package Dimensions (8-pin TSSOP)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters
Min Max
Inches
Max
8
Symbol
Min
--
A
A1
A2
b
--
1.20
0.15
1.05
0.30
0.20
3.10
0.047
0.006
0.041
0.012
0.05
0.80
0.19
0.09
2.90
0.002
0.032
0.007
E1
E
INDEX
AREA
C
0.0035 0.008
0.114 0.122
0.252 BASIC
0.169 0.177
0.0256 Basic
D
E
E1
e
6.40 BASIC
4.30 4.50
0.65 Basic
1
2
L
α
0.45
0°
0.75
8°
0.018
0°
0.030
8°
D
aaa
-
0.10
-
0.004
A
2
A
A
1
c
- C -
e
SEATING
PLANE
b
L
aaa
C
IDT™ / ICS™ 2.5 VOLT LOW EMI CLOCK GENERATOR
6
MK1728-01
REV A 081204
MK1728-01
2.5 VOLT 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
Millimeters
Inches
Min Max
8
Symbol
Min
1.35
0.10
0.33
0.19
4.80
3.80
Max
1.75
0.25
0.51
0.25
5.00
4.00
A
A1
B
C
D
E
e
.0532
.0040
.013
.0688
.0098
.020
E
H
INDEX
AREA
.0075
.1890
.1497
.0098
.1968
.1574
1.27 BASIC
0.050 BASIC
1
2
H
h
L
5.80
0.25
0.40
0°
6.20
0.50
1.27
8°
.2284
.010
.016
0°
.2440
.020
.050
8°
D
α
A
h x 45
A1
C
- C -
e
SEATING
PLANE
B
L
.10 (.004)
C
Ordering Information
Part / Order Number
MK1728-01G
Marking
172801
172801
172801S
172801S
Shipping Packaging
Tubes
Package
8-pin TSSOP
8-pin TSSOP
8-pin SOIC
8-pin SOIC
Temperature
0 to +70° C
0 to +70° C
0 to +70° C
0 to +70° C
MK1728-01GTR
MK1728-01S
MK1728-01STR
Tape and Reel
Tubes
Tape and Reel
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (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.
IDT™ / ICS™ 2.5 VOLT LOW EMI CLOCK GENERATOR
7
MK1728-01
REV A 081204
MK1728-01
2.5 VOLT LOW EMI CLOCK GENERATOR
SSCG
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www.IDT.com
For Sales
800-345-7015
408-284-8200
Fax: 408-284-2775
For Tech Support
<product line email>
<product line phone>
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© 2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT and the IDT logo are trademarks of Integrated Device
Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered
trademarks used to identify products or services of their respective owners.
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