ICS650G-40A [ICSI]
ETHERNET SWITCH CLOCK SOURCE; 以太网交换机时钟源型号: | ICS650G-40A |
厂家: | INTEGRATED CIRCUIT SOLUTION INC |
描述: | ETHERNET SWITCH CLOCK SOURCE |
文件: | 总6页 (文件大小:126K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
ICS650-40A
ETHERNET SWITCH CLOCK SOURCE
Description
Features
The ICS650-40A is a clock chip designed for use as a
core clock 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
• Operating voltage of 3.3 V
• Low power consumption
• Input frequency of 25 MHz
• Low long-term jitter
• Separate supply voltage for clock outputs (2.5 / 3.3 V
clock outputs)
• OE control capability
Block Diagram
VDD
2
VDDOA VDDOB
Control
S1:S0
Logic
2
CLKB
CLKA
CLKA
Phase Lock Loop
X1/ICLK
Clock
Buffer/
25 MHz
crystal or clock
Crystal
Oscillator
X2
Optional tuning crystal
capacitors
4
OE
GND
MDS 650-40A B
1
121004
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS650-40A
ETHERNET SWITCH CLOCK SOURCE
Pin Assignment
Output Select Table (MHz)
S1
S0
CLKA
(MHz)
CLKA
(MHz)
CLKB
(MHz)
X1/ICLK
VDD
1
2
3
4
5
6
7
8
X2
16
15
14
13
12
11
10
9
VDD
OE
0
0
1
1
0
1
0
1
127
133
157
189
127
133
157
189
157
189
127
133
GNDA
VDDOA
CLKA
CLKA
GNDA
S1
GND
VDDOB
CLKB
GNDB
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
GNDA
VDDOA
CLKA
CLKA
GNDA
S1
Power Connect to ground.
4
Power Connect to +2.5 V or +3.3 V. For CLKA outputs only.
Output Clock A output with weak pull-down resistor.
Output Clock A output with weak pull-down resistor.
Power Connect to ground.
5
6
7
8
Input Select pin 1.
9
S0
Input Select pin 0.
10
11
12
13
14
GNDB
CLKB
VDDOB
GND
Power Connect to ground.
Output Clock B output with weak pull-down resistor.
Power Connect to +2.5 V or 3.3 V. For clock output B only.
Power Connect to ground.
OE
Input Output enable tri-states outputs and device is not shut down. This input
has internal pull-up resistor. OE = 1 enables outputs A and B and OE=0
disables outputs A and B. When disabled the pull-down resistor pulls the
outputs to GND.
15
16
VDD
X2
Power Connect to +3.3 V.
Output Crystal connection. Leave unconnected for clock input.
MDS 650-40A B
2
Revision 121004
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS650-40A
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, VDDOA and GND, and VDDOB 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, 2-3 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 ICS650-40A. 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 650-40A B
3
Revision 121004
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS650-40A
ETHERNET SWITCH CLOCK SOURCE
DC Electrical Characteristics
VDD=3.3 V 5%, VDDOA = VDDOB= 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
V
V
V
V
V
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
Note 1
Note 1
VDD/2+0.5
IH
V
VDD/2-0.5
VDD
IL
V
2
IH
V
0.8
IL
V
I
= -12 mA,
2.0
OH
OH
3.3 V VDDO
Output Low Voltage
V
I
= 12 mA, 3.3 V
0.4
V
OL
OL
VDDO
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
70
300
300
mA
kΩ
kΩ
OS
Internal Pull-up Resistor
Internal Pull-down Resistor
R
R
PU
CLK outputs
PD
Note: 1. Nominal switching threshold is VDD/2.
AC Electrical Characteristics
VDD=3.3 V 5%, VDDOA = VDDOB = 3.3 V 5%ꢀ C =10 pF Ambient Temperature 0 to +70° C
L
Parameter
Symbol
Conditions
Min.
Typ. Max. Units
Input Frequency
25
0.6
MHz
ns
Output Rise Time
Output Fall Time
t
20% to 80% of VDD
80% to 20% of VDD
At VDD/2
OR
t
0.6
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
Variation from mean
1000 clock cycles
120
120
600
ps
ps
ps
MDS 650-40A B
4
Revision 121004
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS650-40A
ETHERNET SWITCH CLOCK SOURCE
Thermal Characteristics
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
16
9
650G-40A
######
ICS
YYWW$$
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.
MDS 650-40A B
5
Revision 121004
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS650-40A
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
16-pin TSSOP
16-pin TSSOP
Temperature
0 to +70° C
ICS650G-40A
ICS650G-40AT
Tape and Reel
0 to +70° C
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 650-40A B
6
Revision 121004
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
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