ICS650G-40 [ICSI]
ETHERNET SWITCH CLOCK SOURCE; 以太网交换机时钟源
| 型号： | ICS650G-40 |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | ETHERNET SWITCH CLOCK SOURCE |
| 文件： | 总6页 (文件大小：150K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ICS650-40
ETHERNET SWITCH CLOCK SOURCE
Description
Features
The ICS650-40 is a clock chip designed for use in
Ethernet Switch applications. Using ICS’ patented
Phase-Locked Loop (PLL) techniques, the device takes
a 25 MHz crystal input and produces various output
clock frequencies as listed in Output Select Table.
• Packaged in 16-pin TSSOP
• Available in Pb (lead) free package
• Operating voltage of 3.3 V
• Low power consumption
• Input frequency of 25 MHz
• Low long-term jitter
• 2.5 V to 3.3 V clock outputs
Block Diagram
VDD
3
VDDOA
Control
S1:S0
Logic
2
CLKA
CLKB
Phase Lock Loop
X1/ICLK
Clock
Buffer/
25 MHz
crystal or clock
Crystal
Oscillator
X2
4
GND
Optional tuning crystal
capacitors
OE
VDDOB
MDS 650-40 C
1
Revision 060705
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS650-40
ETHERNET SWITCH CLOCK SOURCE
Pin Assignment
Output Select Table (MHz)
S1
S0
CLKA CLKB
X1/ICLK
VDD
1
2
3
4
5
6
7
8
X2
16
15
14
13
12
11
10
9
(MHz)
(MHz)
GND
OE
0
0
1
1
0
1
0
1
127
127
GND
133
133
157
157
VDDOA
CLKA
CLKB
VDDOB
GND
GND
VDD
VDD
S1
189
189
S0
16-pin (173 mil) TSSOP
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
Pin Description
1
2
X1/ICLK
VDD
Input Crystal or clock input. Connect to a 25 MHz crystal or single ended clock.
Power Connect to +3.3 V.
3
GND
VDDOA
CLKA
CLKB
VDDOB
GND
S0
Power Connect to ground.
4
Power Connect to +2.5 V or +3.3 V. For clock output buffer A only.
Output Clock A output with weak pull-down resistor.
Output Clock B output with weak pull-down resistor.
Power Connect to +2.5 V or +3.3 V. For clock output buffer B only.
Power Connect to ground.
5
6
7
8
9
Input Select pin 0.
10
11
12
13
14
S1
Input Select pin 1.
VDD
Power Connect to +3.3 V.
VDD
Power Connect to +3.3 V.
GND
OE
Power Connect to ground.
Input Output enable tri-states outputs and device is not shut down. Internal
pull-up resistor.
15
16
GND
X2
Power Connect to ground.
Output Crystal connection. Leave unconnected for clock input.
MDS 650-40 C
2
Revision 060705
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS650-40
ETHERNET SWITCH CLOCK SOURCE
External Components
A minimum number of external components are required for proper operation. Decoupling capacitors of
0.01 µF should be connected between VDD and GND pairs. The capacitors should be placed between pins
VDD and GND, and VDDO and GND, as close to the device as possible. A 33Ω series terminating resistor
should be used on each clock output if the trace is longer than 1 inch. A 25 MHz fundamental mode parallel
resonant crystal should be used with C =18 pF.
L
On chip capacitors. On Chip capacitors are used for a 18 pF load crystal. Small 2 to 3 pf trimming
capacitors are used from pins X1 to ground and X2 to ground to optimize the initial accuracy.
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS650-40. 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.
0
Typ.
Max.
+70
Units
°C
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
+3.15
+3.45
V
MDS 650-40 C
3
Revision 060705
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS650-40
ETHERNET SWITCH CLOCK SOURCE
DC Electrical Characteristics
Unless otherwise specified, VDD=3.3 V 5%, Ambient Temperature 0 to +70°C
Parameter
Operating Voltage
Symbol
VDD
Conditions
Min.
3.15
Typ.
Max.
3.45
3.45
Units
V
Output Operating Voltage
Input High Voltage, ICLK
Input Low Voltage, ICLK
Input High Voltage, S1:S0:OE
Input Low Voltage, S1:S0:OE
Output High Voltage
VDDOA,B
2.375
V
V
Note 1
Note 1
VDD/2+0.5
V
IH
V
VDD/2-0.5
VDD
V
IL
V
2
2
V
IH
V
0.4
V
IL
V
I
I
= -12 mA
= 12 mA
V
OH
OH
Output Low Voltage
V
0.4
V
OL
OL
Operating Supply Current
IDD
No load
No load
40
16
mA
mA
IDD at Output Disable
Condition(OE low)
Short Circuit Current
I
Each output
OE pin
35
250
525
mA
kΩ
kΩ
OS
Internal Pull-up Resistor
Internal Pull-down Resistor
R
PUP
R
CLK outputs
PD
Note: 1. Nominal switching threshold is VDD/2.
AC Electrical Characteristics
, VDD = 3.3 V 5%, VDDO = 2.5 - 3.3 V 5%ꢀ C =10 pF Ambient Temperature 0 to +70° C
L
Parameter
Symbol
Conditions
Min.
Typ. Max. Units
Input Frequency
25
1.6
MHz
ns
Output Rise Time
Output Fall Time
t
20% to 80% of VDD
80% to 20% of VDD
at VDD/2
OR
t
1.6
ns
OF
Output Clock Duty Cycle
Frequency Error
40
49-51
0
60
%
all clocks
ppm
ps
Output to Output Skew
between clocks of the same
frequency
250
Absolute Jitter, Short-term P-P
Absolute Jitter, Short-term C-C
Long-term Jitter
variation from mean
1000 clock cycles
100
200
250
200
400
400
ps
ps
ps
MDS 650-40 C
4
Revision 060705
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS650-40
ETHERNET SWITCH CLOCK SOURCE
Thermal Characteristics (16-pin TSSOP)
Parameter
Symbol
Conditions
Min.
Typ. Max. Units
Thermal Resistance Junction to
Ambient
θ
θ
θ
θ
Still air
78
70
68
37
°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
Marking Diagram
Marking Diagram
16
9
16
9
650G40LF
######
YYWW
650G-40
######
YYWW
ICS
ICS
1
8
1
8
Notes:
1. ###### is the lot code.
2. YYWW is the last two digits of the year, and the week number that the part was assembled.
3. “LF” designates Pb (lead ) free package.
4. Bottom marking: (origin). Origin = country of origin if not USA.
MDS 650-40 C
5
Revision 060705
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS650-40
ETHERNET SWITCH CLOCK SOURCE
Package Outline and Package Dimensions (16-pin TSSOPꢀ 173 Mil. Narrow Body)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters
Min Max
Inches
Max
16
Symbol
Min
--
A
A1
A2
b
--
1.20
0.15
1.05
0.30
0.20
5.1
0.047
0.006
0.041
0.012
INDEX
AREA
0.05
0.80
0.19
0.09
4.90
0.002
0.032
0.007
E1
E
C
D
E
0.0035 0.008
0.193 0.201
0.252 BASIC
0.169 0.177
0.0256 Basic
6.40 BASIC
1
2
E1
e
L
4.30
4.50
0.65 Basic
D
0.45
0°
0.75
8°
0.018
0°
0.030
8°
α
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
See Page 6
Shipping Packaging
Tubes
Package
Temperature
0 to +70° C
0 to +70° C
0 to +70° C
0 to +70° C
ICS650G-40
ICS650G-40T
ICS650G-40LF
ICS650G-40LFT
16-pin TSSOP
16-pin TSSOP
16-pin TSSOP
16-pin TSSOP
Tape and Reel
Tubes
See Page 6
Tape and Reel
Parts that are ordered with a "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant.
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 650-40 C
6
Revision 060705
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
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