CLOCK SOURCE. ICS650-40 Datasheet

ICS650-40 SOURCE. Datasheet pdf. Equivalent


Integrated Circuit Systems ICS650-40
ICS650-40
ETHERNET SWITCH CLOCK SOURCE
Description
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.
Features
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
S1:S0
2
Control
Logic
Phase Lock Loop
X1/ICLK
25 MHz
crystal or clock X2
Clock
Buffer/
Crystal
Oscillator
Optional tuning crystal
capacitors
4
GND
OE
VDDOB
CLKA
CLKB
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 Datasheet
Recommendation ICS650-40 Datasheet
Part ICS650-40
Description ETHERNET SWITCH CLOCK SOURCE
Feature ICS650-40; ICS650-40 ETHERNET SWITCH CLOCK SOURCE Description The ICS650-40 is a clock chip designed for use in.
Manufacture Integrated Circuit Systems
Datasheet
Download ICS650-40 Datasheet




Integrated Circuit Systems ICS650-40
ICS650-40
ETHERNET SWITCH CLOCK SOURCE
Pin Assignment
X1/ICLK
VDD
GND
VDDOA
CLKA
CLKB
VDDOB
GND
1
2
3
4
5
6
7
8
16 X2
15 GND
14 OE
13 GND
12 VDD
11 VDD
10 S1
9 S0
16-pin (173 mil) TSSOP
Output Select Table (MHz)
S1 S0 CLKA CLKB
(MHz) (MHz)
0 0 127 127
0 1 133 133
1 0 157 157
1 1 189 189
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin
Name
X1/ICLK
VDD
GND
VDDOA
CLKA
CLKB
VDDOB
GND
S0
S1
VDD
VDD
GND
OE
15 GND
16 X2
Pin
Type
Pin Description
Input Crystal or clock input. Connect to a 25 MHz crystal or single ended clock.
Power Connect to +3.3 V.
Power Connect to ground.
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.
Input Select pin 0.
Input Select pin 1.
Power Connect to +3.3 V.
Power Connect to +3.3 V.
Power Connect to ground.
Input Output enable tri-states outputs and device is not shut down. Internal
pull-up resistor.
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



Integrated Circuit Systems ICS650-40
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 33series 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 CL=18 pF.
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
7V
All Inputs and Outputs
-0.5 V to VDD+0.5 V
Ambient Operating Temperature
0 to +70°C
Storage Temperature
-65 to +150°C
Junction Temperature
125°C
Soldering Temperature
260°C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
Min.
0
+3.15
Typ.
Max.
+70
+3.45
Units
°C
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





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