DATASHEET
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 IDT’s 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
S1:S0
2
VDDOA
VDDOB
Control
Logic
CLKB
Phase Lock Loop
CLKA
CLKA
X1/ICLK
25 MHz
crystal or clock X2
Clock
Buffer/
Crystal
Oscillator
Optional tuning crystal
capacitors
IDT™ / ICS™ ETHERNET SWITCH CLOCK SOURCE
4
OE
GND
1
ICS650-40A
REV E 051310
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ETHERNET SWITCH CLOCK SOURCE
CLOCK SYNTHESIZER
Pin Assignment
Output Select Table (MHz)
X1/ICLK
1
16
X2
VDD
2
15
VDD
GNDA
3
14
OE
VDDOA
4
13
GND
CLKA
5
12
VDDOB
CLKA
6
11
CLKB
GNDA
7
10
GNDB
S1
8
9
S1
S0
CLKA
(MHz)
CLKA
(MHz)
CLKB
(MHz)
0
0
127
127
157
0
1
133
133
189
1
0
157
157
127
1
1
189
189
133
S0
16-pin (173 mil) TSSOP
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
Pin Description
1
X1/ICLK
Input
Crystal or clock input. Connect to a 25 MHz crystal or single ended clock.
2
VDD
Power
Connect to +3.3 V.
3
GNDA
Power
Connect to ground.
4
VDDOA
Power
Connect to +2.5 V or +3.3 V. For CLKA outputs only.
5
CLKA
Output
Clock A output with weak pull-down resistor.
6
CLKA
Output
Clock A output with weak pull-down resistor.
7
GNDA
Power
Connect to ground.
8
S1
Input
Select pin 1.
9
S0
Input
Select pin 0.
10
GNDB
Power
Connect to ground.
11
CLKB
Output
Clock B output with weak pull-down resistor.
12
VDDOB
Power
Connect to +2.5 V or 3.3 V. For clock output B only.
13
GND
Power
Connect to ground.
14
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
VDD
Power
Connect to +3.3 V.
16
X2
Output
Crystal connection. Leave unconnected for clock input.
IDT™ / ICS™ ETHERNET SWITCH CLOCK SOURCE
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ETHERNET SWITCH CLOCK SOURCE
CLOCK SYNTHESIZER
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 CL=18 pF.
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 IDT 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
Min.
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
IDT™ / ICS™ ETHERNET SWITCH CLOCK SOURCE
3
Typ.
Max.
Units
0
+70
°C
+3.15
+3.45
V
ICS650-40A
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ETHERNET SWITCH CLOCK SOURCE
CLOCK SYNTHESIZER
DC Electrical Characteristics
VDD=3.3 V ±5%, VDDOA = VDDOB= 3.3 V ±5% Ambient Temperature 0 to +70° C
Parameter
Operating Voltage
Symbol
Conditions
Min.
Typ.
Max.
Units
VDD
3.15
3.45
V
Output Operating Voltage
VDDOA,
B
2.375
3.45
V
Input High Voltage, ICLK
VIH
Note 1
Input Low Voltage, ICLK
VIL
Note 1
Input High Voltage, S1:S0:OE
VIH
Input Low Voltage, S1:S0:OE
VIL
Output High Voltage
VOH
IOH = -12 mA,
3.3 V VDDO
Output Low Voltage
VOL
IOL = 12 mA, 3.3
V VDDO
Operating Supply Current
IDD
No load
40
mA
No load
16
mA
IDD at Output Disable
Condition(OE low)
VDD/2+0.5
V
VDD/2-0.5
V
VDD
V
0.8
V
2
2.0
V
0.4
V
Short Circuit Current
IOS
Each output
±70
mA
Internal Pull-up Resistor
RPU
OE pin
300
kΩ
Internal Pull-down Resistor
RPD
CLK outputs
300
kΩ
Note: 1. Nominal switching threshold is VDD/2.
AC Electrical Characteristics
VDD=3.3 V ±5%, VDDOA = VDDOB = 3.3 V ±5%, CL=10 pF Ambient Temperature 0 to +70° C
Parameter
Symbol
Conditions
Min.
Input Frequency
Typ.
Max. Units
25
MHz
Output Rise Time
tOR
20% to 80% of VDD
0.6
ns
Output Fall Time
tOF
80% to 20% of VDD
0.6
ns
Output Clock Duty Cycle
At VDD/2
Frequency Error
All clocks
40
49-51
60
0
Output to Output Skew
between clocks of the same
frequency
%
ppm
250
ps
Absolute Jitter, Short-term
P-P
Variation from mean
±120
ps
Absolute Jitter, Short-term
C-C
Variation from mean
±120
ps
Long-term Jitter
1000 clock cycles
600
ps
IDT™ / ICS™ ETHERNET SWITCH CLOCK SOURCE
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ETHERNET SWITCH CLOCK SOURCE
CLOCK SYNTHESIZER
Thermal Characteristics
Parameter
Symbol
Conditions
Min.
Typ.
Max. Units
Thermal Resistance Junction to
Ambient
θ JA
Still air
78
° C/W
θ JA
1 m/s air flow
70
° C/W
θ JA
3 m/s air flow
68
° C/W
Thermal Resistance Junction to Case
θ JC
37
° C/W
Marking Diagram (RoHS compliant)
16
9
650G40AL
######
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.
3. “L” designates RoHS compliant package.
4. Bottom marking: country of origin if not USA.
IDT™ / ICS™ ETHERNET SWITCH CLOCK SOURCE
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ETHERNET SWITCH CLOCK SOURCE
CLOCK SYNTHESIZER
Package Outline and Package Dimensions (16-pin TSSOP, 173 Mil. Narrow Body)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters
16
Symbol
Index
Area
E1
E
IN D EX
AR EA
1
Pin 1
E
H
Min
Max
--
1.20
--
0.047
0.05
0.15
0.002
0.006
A2
0.80
1.05
0.032
0.041
b
0.19
0.30
0.007
0.012
C
0.09
0.20
0.0035
0.008
D
4.90
5.1
0.193
0.201
6.40 BASIC
4.30
e
A
2
Min
A
E1
DD
Max
A1
E
2
Inches
4.50
0.252 BASIC
0.169
0.65 Basic
0.177
0.0256 Basic
L
0.45
0.75
0.018
0.030
α
0°
8°
0°
8°
aaa
--
0.10
--
0.004
A
A
1
c
A
-C -
a
c
e
e
b
b
S E A T IN G
P LA N E
L
L
aaa C
Ordering Information
Part / Order Number
Marking
Shipping Packaging
Package
Temperature
650G-40ALF
See Page 6
Tubes
16-pin TSSOP
0 to +70° C
Tape and Reel
16-pin TSSOP
0 to +70° C
650G-40ALFT
"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 Device Technology (IDT) 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 IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT
does not authorize or warrant any IDT product for use in life support devices or critical medical instruments.
IDT™ / ICS™ ETHERNET SWITCH CLOCK SOURCE
6
ICS650-40A
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ICS650-40A
ETHERNET SWITCH CLOCK SOURCE
CLOCK SYNTHESIZER
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For Tech Support
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