DATASHEET
ICS650-36
NETWORKING AND PCI CLOCK SOURCE
Description
Features
The ICS650-36 is a low cost frequency generator designed
to support networking and PCI applications. Using
analog/digital Phase Locked-Loop (PLL) techniques, the
device uses a standard fundamental mode, inexpensive
crystal input of 25 MHz to produce four output clocks
supporting LAN, PCI, and 100M SDRAM functions.
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•
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The device also has a power down feature that tri-states the
clock outputs and turns off the PLL when the PDTS pin is
taken low.
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Packaged in 16-pin TSSOP
Pb (lead) free package
Replaces multiple crystals and oscillators
Input crystal or clock frequency of 25 MHz
Fixed reference output frequency of 25 MHz
Selectable output frequencies of 33.3, 33.333, 50,
66.666, 100, and 125 MHz
Duty cycle of 40/60
Operating voltage of 3.3 V
Advanced, low-power CMOS process
Industrial and commercial temperature ranges
Block Diagram
VDD
3
S2:0
Select/
Control
Circuit
3
X1/ICLK
25 MHz
crystal
input
X2
PLL1
CLK1
PLL2
CLK2
PLL3
CLK3
Crystal
Oscillator/
Clock
Buffer
REF
3
External capacitors
may be required.
IDT™ / ICS™ NETWORKING AND PCI CLOCK SOURCE
GND
1
PDTS
(all outputs and PLLs)
ICS650-36
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ICS650-36
NETWORKING AND PCI CLOCK SOURCE
CLOCK SYNTHESIZER
Pin Assignment
CLK Output Selection Table
S2
S1
S0
REF
CLK1
CLK2
CLK3
X2
1
16
VDD
0
0
0
OFF
33.30
50
125
X1
2
15
GND
0
0
1
ON
33.333
33.333
125
GND
3
14
REF
0
1
0
ON
33.333
66.666
125
CLK3
4
13
S0
0
1
1
ON
66.666
66.666
125
PDTS
S2
5
12
VDD
1
0
0
ON
33.333
50
125
6
11
CLK1
1
0
1
ON
33.333
50
100
GND
1
1
0
ON
33.333
66.666
100
S1
1
1
1
ON
33.30
50
125
CLK2
7
10
VDD
8
9
Note: All frequencies are in MHz.
16-pin (173 mil) TSSOP
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
1
X2
Output
2
X1
Input
Crystal connection. Connect to 25 MHz crystal or clock input.
3
GND
Power
Connect to ground.
4
CLK3
Output
Selectable clock output. See table above for frequency. Weak
internal pull-down when tri-state.
PDTS
Input
6
S2
Input
7
CLK2
Output
Selectable clock output. See table above for frequency. Weak
internal pull-down when tri-state.
8
VDD
Power
Connect to +3.3 V.
9
S1
Input
Select pin. Selects clock output frequency from table above.
Internal pull-up resistor.
10
GND
Power
Connect to ground.
11
CLK1
Output
Selectable clock output. See table above for frequency. Weak
internal pull-down when tri-state.
12
VDD
Power
Connect to +3.3 V.
13
S0
Input
Select pin. Selects clock output frequency from table above.
Internal pull-up resistor.
5
IDT™ / ICS™ NETWORKING AND PCI CLOCK SOURCE
Pin Description
Crystal connection. Connect to 25 MHz crystal input or float for
clock.
Powers down entire chip and tri-states outputs when low. Internal
pull-up resistor.
Select pin. Selects clock output frequency from table above.
Internal pull-up resistor.
2
ICS650-36
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ICS650-36
NETWORKING AND PCI CLOCK SOURCE
CLOCK SYNTHESIZER
Pin
Number
Pin
Name
Pin
Type
Pin Description
14
REF
Output
Reference 25 MHz clock output. Weak internal pull-down when
tri-state.
15
GND
Power
Connect to ground.
16
VDD
Power
Connect to +3.3 V.
External Components
Decoupling Capacitor
Example: For a crystal with a 16 pF load capacitance, each
crystal capacitor would be 20 pF [(16-6) x 2 = 20].
As with any high performance mixed-signal IC, the
ICS650-36 must be isolated from system power supply
noise to perform optimally.
PCB Layout Recommendations
Observed the following guidelines for optimum device
performance and lowest output phase noise:
A decoupling capacitor of 0.01µF must be connected
between each VDD and the PCB ground plane.
1) The 0.01µF decoupling capacitors should be mounted on
the component side of the board as close to the VDD pin as
possible. No vias should be used between the decoupling
capacitors and VDD pins. The PCB trace to VDD pins
should be kept as short as possible, as should the PCB
trace to the ground via.
Series Termination Resistor
Clock output traces over one inch should use series
termination. To series terminate a 50Ω trace (a commonly
used trace impedance), place a 33Ω resistor in series with
the clock line, as close to the clock output pin as possible.
The nominal impedance of the clock output is 20Ω.
2) The external crystal should be mounted just next to the
device with short traces. The X1 and X2 traces should not
be routed next to each other with minimum spaces, instead
they should be separated and away from other traces.
Crystal Load Capacitors
The device crystal connections should include pads for
small capacitors from X1 to ground and from X2 to ground.
These capacitors are used to adjust the stray capacitance of
the board to match the nominally required crystal load
capacitance. Because load capacitance can only be
increased in this trimming process, it is important to keep
stray capacitance to a minimum by using very short PCB
traces (and no vias) between the crystal and device. Crystal
capacitors must be connected from each of the pins X1 and
X2 to ground.
3) Place the 33Ω series termination resistor (if needed)
close to the clock output to minimize EMI.
4) An optimum layout is one with all components on the
same side of the board, minimizing vias through other signal
layers. Other signal traces should be routed away from the
ICS650-36. This includes signal traces just underneath the
device, or on layers adjacent to the ground plane layer used
by the device.
The value (in pF) of these crystal caps should equal (CL -6
pF)*2. In this equation, CL= crystal load capacitance in pF.
IDT™ / ICS™ NETWORKING AND PCI CLOCK SOURCE
3
ICS650-36
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ICS650-36
NETWORKING AND PCI CLOCK SOURCE
CLOCK SYNTHESIZER
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS650-36. 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
-0.5 V to 7 V
All Inputs and Outputs
-0.5 V to VDD+0.5 V
Ambient Operating Temperature (commercial)
0 to +70° C
Ambient Operating Temperature (industrial)
-40 to +85° C
Storage Temperature
-65 to +150° C
Junction Temperature
125° C
Soldering Temperature
260° C
Recommended Operation Conditions
Parameter
Min.
Ambient Operating Temperature (commercial)
Ambient Operating Temperature (industrial)
Power Supply Voltage (measured in respect to GND)
IDT™ / ICS™ NETWORKING AND PCI CLOCK SOURCE
4
Max.
Units
0
+70
°C
-40
+85
°C
+3.465
V
+3.135
Typ.
+3.3
ICS650-36
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ICS650-36
NETWORKING AND PCI CLOCK SOURCE
CLOCK SYNTHESIZER
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V ±5%, Ambient Temperature -40 to +85° C
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
3.135
3.3
3.465
V
Operating Voltage
VDD
Supply Current
IDD
No load, PDTS=1
25
mA
IDDPD
No load, PDTS=0
100
µA
Power Down Current
Input High Voltage
VIH
PDTS, S2:0
Input Low Voltage
VIL
PDTS, S2:0
Output High Voltage
VOH
IOH = -4 mA
VDD-0.3
V
Output High Voltage
VOH
IOH = -12 mA
2.4
V
Output Low Voltage
VOL
IOL = 12 mA
Short Circuit Current
IOS
Clock outputs
Input Capacitance, inputs
2
V
0.8
V
0.4
V
±65
mA
CIN
5
pF
Nominal Output Impedance
ZOUT
20
Ω
Internal Pull-up Resistor
RPU
PDTS, S2:0
500
kΩ
Internal Pull-down Resistor
RPD
Outputs
250
kΩ
Typ.
Max. Units
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V ±5%, Ambient Temperature -40 to +85° C
Parameter
Symbol
Input Frequency
fIN
Output Rise Time
tOR
Output Fall Time
tOF
Conditions
Min.
25
MHz
20% to 80%, Note 1
0.8
ns
80% to 20%, Note 1
0.7
ns
Output Clock Duty Cycle
at VDD/2, Note 1
Absolute Clock Period Jitter
Note 1
±125
ps
Clock Jitter, Cycle-to-Cycle
33.333M, 66.666M,
Note 1
150
ps
Clock Jitter, Long Term
25M, n=1000, Note1
900
ps
0
ppm
Frequency Synthesis Error
40
60
%
Output Enable Time
tOE
PDTS high to output
locked to ±1%
350
µs
Output Disable Time
tOD
PDTS low to tri-state
25
ns
Note 1: Measured with a 15 pF load.
IDT™ / ICS™ NETWORKING AND PCI CLOCK SOURCE
5
ICS650-36
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ICS650-36
NETWORKING AND PCI CLOCK SOURCE
CLOCK SYNTHESIZER
Thermal Characteristics
Parameter
Symbol
Thermal Resistance Junction to
Ambient
Thermal Resistance Junction to Case
Conditions
Min.
Typ.
Max. Units
θJA
Still air
78
° C/W
θJA
1 m/s air flow
70
° C/W
θJA
3 m/s air flow
68
° C/W
37
° C/W
θJC
Marking Diagrams
(ICS650G-36LF)
(ICS650GI-36LF)
16
16
9
650GI36L
######
YYWW
650G36LF
######
YYWW
1
9
1
8
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” or “L” designates Pb free packaging.
4. “I” designates industrial temperature range.
5. Bottom marking: (origin). Origin = country of origin if not USA.
IDT™ / ICS™ NETWORKING AND PCI CLOCK SOURCE
6
ICS650-36
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NETWORKING AND PCI 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
E1
A
A1
A2
b
C
D
E
E1
e
L
α
aaa
E
IN D EX
AR EA
1
2
D
A
2
Min
Inches*
Max
-1.20
0.05
0.15
0.80
1.05
0.19
0.30
0.09
0.20
4.90
5.1
6.40 BASIC
4.30
4.50
0.65 Basic
0.45
0.75
0°
8°
-0.10
Min
Max
-0.047
0.002
0.006
0.032
0.041
0.007
0.012
0.0035 0.008
0.193
0.201
0.252 BASIC
0.169
0.177
0.0256 Basic
0.018
0.030
0°
8°
-0.004
*For reference only. Controlling dimensions in mm.
A
A
1
c
-C e
b
S E A TIN G
P LA N E
L
aaa C
Ordering Information
Part / Order Number
650G-36LF
650G-36LFT
650GI-36LF
650GI-36LFT
Marking
Shipping Packaging
Package
Temperature
see page 6
Tubes
Tape and Reel
Tubes
Tape and Reel
16-pin TSSOP
16-pin TSSOP
16-pin TSSOP
16-pin TSSOP
0 to +70 ° C
0 to +70 ° C
-40 to +85 ° C
-40 to +85 ° C
"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™ NETWORKING AND PCI CLOCK SOURCE
7
ICS650-36
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NETWORKING AND PCI CLOCK SOURCE
CLOCK SYNTHESIZER
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