ICS556G-01T [ICSI]
BROADCOM 25 MHZ LVDS CLOCK; 博通25 MHz的LVDS时钟
| 型号： | ICS556G-01T |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | BROADCOM 25 MHZ LVDS CLOCK |
| 文件： | 总6页 (文件大小：141K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ICS556-01
BROADCOM 25 MHZ LVDS CLOCK
Description
Features
The ICS556-01 is a clock oscillator with LVDS outputs.
Using a standard 25 MHz crystal, the device outputs a
.25 mHz (reference) differential output clock. The
operation voltage is 2.5 V to support today’s popular
interfaces. The termination resistor is off-chip.
• Packaged in 8-pin TSSOP
• Requires no external components
• Low Phase Jitter: <1 ps from 10 kHz to 10 MHz
• Differential LVDS outputs
• Operating voltage of 2.5 V.
• Advanced, low power, sub-micron CMOS process
Block Diagram
VDD
OE
X1
CLK
Crystal
100
25 MHz Crystal
Oscillator
CLK
X2
2
GND
MDS 556-01 B
1
Revision 020204
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS556-01
Broadcom 25 MHz LVDS Clock
Pin Assignment
X 1
V D D
G N D
G N D
8
7
6
5
X 2
1
2
3
4
O E
C L K
C L K
I C S 5 5 6 - 0 1
8 P i n ( 1 7 3 m i l ) T S S O P o r S O I C
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
Pin Description
1
2
3
4
5
6
7
8
X1
VDD
GND
GND
CLK
CLK
OE
Input
Crystal connection.
Power Power supply. Connect to 2.5 V.
Power Connect to ground.
Power Connect to ground.
Output Inverting differential clock output.
Power Differential clock output.
Input
Input
Output Enable. Internal pull-up resistor.
Crystal connection.
X2
only partial outputs are used, it is recommended to
terminate the un-used outputs.
External Component Selection
The ICS556-01 requires a minimum number of external
components for proper operation. A 100Ω termination
resistor between CLK and CLK is provided on-chip.
2.5V
2.5V
LVDS_Driver
Decoupling Capacitors
+
R1
100 ohm
A decoupling capacitor of 0.01µF should be connected
between VDD and GND on pins 2 and 3 as close to the
ICS556-01 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.
100 Ohm Differential Transmission Line
F I G U R E 2 . T Y P I C A L L V D S
D R I V E R T E R M I N A T I O N
LVDS Driver Termination
A general LVDS interface is shown in Figure 2. In a 100
differential transmission line environment, LVDS drivers
require a matched load termination of 100 across near
the receiver input. For a multiple LVDS outputs buffer, if
MDS 556-01 B
2
Revision 020204
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS556-01
Broadcom 25 MHz LVDS Clock
Recommended Crystal Parameters:
Quartz Crystal
Initial Accuracy of 25°C±20 ppm
Temperature Stability±20 ppm
Load Capacitance5 pf
Shunt Capacitance, C02 pF Max
Equivalent Series Resistance80 Ω Max
The ICS556-01 25 MHz LVDS Clock utilizes an
external crystal to generate a low phase noise output.
To assure the best system performance and reliability,
a crystal device with the recommended parameters
(shown below) must be used, and the layout guidelines
discussed in the following section shown must be
followed.
The external crystal must be connected as close to the
chip as possible and should be on the same side of the
PCB as the ICS556-01. There should be no via’s
between the crystal pins and the X1 and X2 device
pins. There should be no signal traces underneath or
close to the crystal.
The frequency of oscillation of a quartz crystal is
determined by its “cut” and by the load capacitors
connected to it. The crystal specified for use with the
ICS556-01 is designed to have zero frequency error
when the total of on-chip plus stray capacitance is 5 pF.
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: or a crystal with a 16 pF
load capacitance, each crystal capacitor would be 8 pF
[(16-12) x 2] = 8.
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS556-01. 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
Ambient Operating Temperature
Storage Temperature
-65 to +150°C
260°C
Soldering Temperature
Recommended Operation Conditions
Parameter
Min.
Typ.
Max.
+70
Units
°C
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
Reference crystal parameters
0
+2.375
+2.625
V
Refer to page 3
MDS 556-01 B
3
Revision 020204
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS556-01
Broadcom 25 MHz LVDS Clock
DC Electrical Characteristics
VDD=2.5 V 5% , Ambient temperature 0 to +70°C, unless stated otherwise
Parameter
Operating Voltage
Output High Voltage
Output Low Voltage
Symbol
Conditions
Min.
2.375
1.375
Typ.
Max.
Units
VDD
2.625
V
V
V
V
V
Note 1
Note 1
= -4 mA
OH
V
1.125
OL
Output High Voltage (CMOS
Level)
V
I
VDD-0.4
OH
OH
Operating Supply Current
IDD
No load, OE = 1
No load, OE = 0
5.3
1.7
mA
mA
Note 1: Outputs terminated with 50Ω to VDD/2
AC Electrical Characteristics
VDD = 2.5 V 5%, Ambient Temperature 0 to +70° C, unless stated otherwise
Parameter
Conditions
Min. Typ. Max. Units
Input Frequency
25
25
350
0
MHz
MHz
mV
mV
V
Output Frequency
Differential Output Voltages (V
)
250
-40
450
40
OD
∆ V
V
Magnitude Change
Magnitude Change
OS
OD
OD
Offset Voltage (V
)
1.125 1.25 1.375
OS
∆ V
V
3
25
mV
mA
mA
ns
OS
Differential Output Short Circuit Current (I
)
-3.5
-3.5
0.8
0.8
50
OSD
Output Short Circuit Current (I
Output Rise Time
)
OS
20% to 80%, no load
20% to 80%, no load
Measured at 1.25 V,
1.2
1.2
55
Output Fall Time
ns
Output Clock Duty Cycle
45
%
C =5 pF
L
Maximum Output Jitter (p-p)
Phase Jitter (RMS)
C =5 pF
40
ps
ps
L
Phase Noise integrated
from 10 kHz to 10 MHz
1.8
2.5
MDS 556-01 B
4
Revision 020204
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS556-01
Broadcom 25 MHz LVDS Clock
ParameterMeasurementInformation
VDD = 2.5V±5%
SCOPE
Z = 50Ω
Qx
80%
VOD
80%
50Ω
LVDS
Z = 50Ω
nQx
20%
20%
Clock
Outputs
50Ω
tOR
tOF
OUTPUT RISE/FALL TIME
2.5V OUTPUT LOAD AC TEST CIRCUIT
V D D
nCLK
out
5 0 Ω
5 0 Ω
D C Input
LV D S
CLK
Pulse Width
V O S /∆ V O S
out
tPERIOD
V O S S E T U P
tPW & tPERIOD
VDD
nCLK
CLK
VOH
VOL
out
DC Input
LVDS
100Ω
VOD/∆VOD
t(φ)
out
tjit(φ) = t(φ) - t(φ)mean = Phase Jitter
VOD SETUP
PHASE JITTER
VDD
nCLK
Cross Points
VOD
VOS
CLK
GND
DIFFERENTIAL INPUT LEVEL
MDS 556-01 B
5
Revision 020204
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS556-01
Broadcom 25 MHz LVDS Clock
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
A
Min
--
--
1.20
0.15
1.05
0.30
0.20
3.10
0.047
0.006
0.041
0.012
A1
0.05
0.80
0.19
0.09
2.90
0.002
0.032
0.007
E1
A2
b
C
E
INDEX
AREA
0.0035 0.008
0.114 0.122
0.252 BASIC
0.169 0.177
0.0256 Basic
D
E
E1
e
L
6.40 BASIC
4.30 4.50
0.65 Basic
1
2
D
0.45
0°
0.75
8°
0.018
0.030
8°
α
0°
aaa
-
0.10
-
0.004
A
2
A
A
1
c
- C -
e
SEATING
PLANE
b
L
aaa
C
Ordering Information
Part / Order Number
Marking
Shipping
packaging
Tubes
Package
Temperature
ICS556G-01
ICS556G-01T
556G-01
556G-01
8-pin TSSOP
8-pin TSSOP
0 to +70° C
0 to +70° C
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 556-01 B
6
Revision 020204
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
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