ICS552R-01CI [IDT]
Clock Generator, PDSO20, 0.150 INCH, SSOP-20;
| 型号： | ICS552R-01CI |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | Clock Generator, PDSO20, 0.150 INCH, SSOP-20 时钟 光电二极管 外围集成电路 晶体 |
| 文件： | 总6页 (文件大小：129K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ICS552-01C
Crystal Oscillator with 8 Low Skew Outputs
Description
Features
The ICS552-01C produces 8 low skew copies of the
output of a crystal oscillator when a fundamental,
parallel-mode crystal is connected to it. It is ideal for
distributing multiple, low-phase-noise clocks.
• Packaged as 20-pin SSOP (QSOP)
• Pb-free packaging available
• Input frequency of 10.0 to 27.0 MHz
• Provides 8 low-skew outputs (<250 ps)
• Output clock duty cycle of 40/60 at 3.3 V
• Operating voltages of 3.0 V to 5.5 V
• Industrial temperature available
• Use with 25 MHz crystal for networking
• Use with 27 MHz crystal for MPEG
Block Diagram
VDD
5
CLK1
CLK2
CLK3
CLK4
CLK5
CLK6
CLK7
CLK8
10.0 to 27.0 MHz
crystal input
X1
Crystal
Oscillator
X2
3
External capacitors are
required with a crystal input.
GND
MDS 552-01C C
1
Revision 013004
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS552-01C
Crystal Oscillator with 8 Low Skew Outputs
Pin Assignment
DC
X2
X1
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VDD
DC
CLK8
CLK7
VDD
VDD
GND
GND
CLK1
CLK2
CLK3
CLK4
VDD
GND
CLK6
CLK5
VDD
20-pin (150 mil) SSOP (QSOP)
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
Pin Description
1
2
DC
X2
—
Do not connect.
XO
Crystal connection. Connect to a 10 - 27 MHz fundamental mode crystal.
Crystal connection. Connect to a 10 - 27 MHz fundamental mode crystal.
Connect to +3.3 V or 5.0 V. Decouple with pin 6.
3
X1
XI
4
VDD
GND
GND
CLK1
CLK2
CLK3
CLK4
VDD
CLK5
CLK6
GND
VDD
VDD
CLK7
CLK8
DC
Power
Power
Power
Connect to ground.
5
6
Connect to ground.
7
Output Output clock 1.
Output Output clock 2.
Output Output clock 3.
Output Output clock 4.
8
9
10
11
12
13
14
15
16
17
18
19
20
Power
Connect to +3.3 V or 5.0 V.
Output Output clock 5.
Output Output clock 6.
Power
Power
Power
Connect to ground.
Connect to +3.3 V or 5.0 V.
Connect to +3.3 V or 5.0 V. Decouple with pin 14.
Output Output clock 7.
Output Output clock 8.
Do not connect.
—
VDD
Power
Connect to +3.3 V or 5.0 V.
MDS 552-01C C
2
Revision 013004
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS552-01C
Crystal Oscillator with 8 Low Skew Outputs
PCB Layout Recommendations
External Components
For optimum device performance and lowest output
phase noise, the following guidelines should be
observed.
Series Termination Resistor
Clock output traces over one inch should use series
termination. 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.
1) Each 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 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.
Decoupling Capacitors
2) The external crystal should be mounted just next to
the device with short traces. The X1 and X2 traces
should not be routed next to each other with minimum
spaces, instead they should be separated and away
from other traces.
As with any high-performance mixed-signal IC, the
ICS552-01C must be isolated from system power
supply noise to perform optimally.
Decoupling capacitors of 0.01µF must be connected
between each VDD and GND on pins 4 and 6, and 16
and 14. Other VDDs and GNDs can be connected to
these pins or directly to their respective ground planes.
3) To minimize EMI, the 33Ω series termination resistor
(if needed) should be placed close to the clock output.
4) An optimum layout is one with all components on the
same side of the board, minimizing vias through other
signal layers.
Crystal Load Capacitors
The crystal should be a fundamental mode (do not use
third overtone), parallel resonant, with accuracy as
required by the application. The device crystal
connections should include pads for small capacitors
from X1 to ground and from X2 to ground. These
capacitors are used to adjust the stray capacitance of
the board to match the nominally required crystal load
capacitance. Because load capacitance can only be
increased in this trimming process, it is important to
keep stray capacitance to a minimum by using very
short PCB traces (and no vias) been the crystal and
device. Crystal capacitors must be connected from
each of the pins X1 and X2 to ground.
The value (in pF) of these crystal caps should equal
(C -12 pF)*2. In this equation, C = crystal load
L
L
capacitance in pF. Example: For a crystal with a 18 pF
load capacitance, two 12 pF capacitors should be
used.
MDS 552-01C C
3
Revision 013004
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS552-01C
Crystal Oscillator with 8 Low Skew Outputs
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS552-01C. 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.
Parameter
Condition
Min.
Typ.
Max.
7
Units
V
Supply Voltage, VDD
Inputs
Referenced to GND
Referenced to GND
Referenced to GND
-0.5
-0.5
-65
VDD+0.5
VDD+0.5
150
V
Clock Outputs
V
Storage Temperature
Soldering Temperature
Junction Temperature
°C
°C
°C
Max 10 seconds
260
125
Recommended Operation Conditions
Parameter
Min.
0
Typ.
Max.
+70
Units
°C
Ambient Operating Temperature (ICS552R-01C)
Ambient Operating Temperature (ICS552R-01CI)
-40
+85
°C
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V or 5 V, Ambient Temperature -40 to +85°C
Parameter
Operating Voltage
Input High Voltage
Input Low Voltage
Output High Voltage
Symbol
Conditions
Min.
Typ.
Max. Units
VDD
3.0
5.5
V
V
V
V
V
ICLK
ICLK
VDD/2+1 VDD/2
IH
V
VDD/2 VDD/2-1
IL
V
VDD = 3.3 V,
= -8 mA
2.4
OH
I
OH
Output Low Voltage
V
VDD = 3.3 V,
= 8 mA
0.4
V
OL
OH
OS
DD
DD
I
OL
Output High Voltage
V
VDD = 3.3 V or 5 V,
= -8 mA
VDD-0.4
V
I
OH
Short Circuit Current
Operating Supply Current
Operating Supply Current
I
I
I
VDD = 3.3 V, each
output
50
19
11
mA
mA
mA
at 3.3 V, no load, 27
MHz
at 5 V, no load, 27 MHz
MDS 552-01C C
4
Revision 013004
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS552-01C
Crystal Oscillator with 8 Low Skew Outputs
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V or 5 V, Ambient Temperature -40 to +85° C
Parameter
Symbol
Conditions
Fundamental crystal
Input clock
Min.
10
Typ.
Max. Units
Input Frequency
F
27
27
MHz
MHz
ns
IN
10
Output Rise Time
Output Fall Time
Duty Cycle
t
0.8 to 2.0 V
1.5
1.5
60
OR
t
2.0 to 0.8 V
ns
OF
at VDD/2
40
50
%
Output-to-Output Skew
Rising edges at VDD/2
250
ps
Thermal Characteristics
Parameter
Symbol
Conditions
Min.
Typ. Max. Units
Thermal Resistance Junction to
Ambient
θ
θ
θ
Still air
135
93
°C/W
°C/W
°C/W
°C/W
JA
JA
JA
JC
1 m/s air flow
3 m/s air flow
78
Thermal Resistance Junction to Case
θ
60
MDS 552-01C C
5
Revision 013004
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS552-01C
Crystal Oscillator with 8 Low Skew Outputs
Package Outline and Package Dimensions (20-pin SSOP, 150 Mil. Wide Body)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters
Inches
20
Symbol
Min
Max
1.75
0.25
1.50
0.30
0.25
8.75
6.20
4.00
Min
Max
A
A1
A2
b
1.35
0.10
--
0.20
0.18
8.55
5.80
3.80
0.053
0.004
--
0.008
0.007
0.337
0.228
0.150
0.069
0.010
0.059
0.012
0.010
0.344
0.244
0.157
E1
E
INDEX
AREA
c
D
E
E1
e
1
2
.635 Basic
.025 Basic
D
L
0.40
0°
1.27
8°
0.016
0°
0.050
8°
α
aaa
--
0.10
--
0.004
A
A2
A1
c
- C -
e
SEATING
PLANE
b
L
aaa C
Ordering Information
Part / Order Number
Marking
Shipping
packaging
Package
Temperature
ICS552R-01C
ICS552R-01CT
ICS552R-01CLF
ICS552R-01CLFT
ICS552R-01CI
ICS552-01C
ICS552-01C
Tubes
20-pin SSOP
20-pin SSOP
20-pin SSOP
20-pin SSOP
20-pin SSOP
20-pin SSOP
0 to +70°C
0 to +70°C
0 to +70°C
0 to +70°C
-40 to +85°C
-40 to +85°C
Tape and Reel
Tubes
ICS552-01CLF
ICS552-01CLF
ICS552-01CI
ICS552-01CI
Tape and Reel
Tubes
ICS552R-01CIT
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.
MDS 552-01C C
6
Revision 013004
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
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