DATASHEET
ICS650-27
NETWORKING CLOCK SOURCE
Description
Features
The ICS650-27 is a low cost, low jitter, high performance
clock synthesizer for networking applications. Using analog
Phase-Locked Loop (PLL) techniques, the device accepts a
12.5 MHz or 25 MHz clock or fundamental mode crystal
input to produce multiple output clocks for networking chips,
PCI devices, SDRAM, and ASICs. The ICS650-27 outputs
all have zero ppm synthesis error.
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The ICS650-27 is pin compatible and functionally
equivalent to the ICS650-07. It is a performance
upgrade and is recommended for all new 3.3V designs.
See the MK74CB214, ICS551, and ICS552-01 for non-PLL
buffer devices which produce multiple low-skew copies of
these output clocks.
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See the ICS570, ICS9112-16/17/18 for zero delay buffers
that can synchronize outputs and other needed clocks.
Packaged in 20-pin (150 mil) SSOP (QSOP)
Pb (lead) free package, RoHS compliant
12.5 MHz or 25 MHz fundamental crystal or clock input
Six output clocks with selectable frequencies
SDRAM frequencies of 67, 83, 100, and 133 MHz
Buffered crystal reference output
Zero ppm synthesis error in all clocks
Ideal for PMC-Sierra’s ATM switch chips
Full CMOS output swing with 25 mA output drive
capability at TTL levels
Advanced, low-power, sub-micron CMOS process
Operating voltage of 3.3 V
Industrial temperature only
Block Diagram
VDD
2
CLKA1
ACS1:0
BCS1:0
2
CLKA2
/2
2
Clock
Synthesis
and Control
Circuitry
CCS
CLKB1
CLKB2
/2
CLKC1
CLKC2
X1/ICLK
25 or 12.5 MHz
cyrstal or clock
X2
Clock
Buffer/
Crystal
Oscillator
REFOUT
2
OE (all outputs)
GND
IDT™ / ICS™ NETWORKING CLOCK SOURCE
1
ICS650-27
REV F 051310
ICS650-27
NETWORKING CLOCK SOURCE
CLOCK SYNTHESIZER
Pin Assignment
ASC0
1
20
BCS1
X2
2
19
BCS0
X1/ICLK
3
18
REFOUT
VDD
4
17
CLKA1
ASC1
5
16
VDD
GND
6
15
OE
CLKC1
7
14
GND
CLKC2
8
13
CLKA2
CLKB2
9
12
DC
CLKB1
10
11
CCS
20-pin (150 mil) SSOP
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
Pin Description
1
ACS0
Input
A clock select 0. Selects outputs on CLKA1 and CLKA2 per table on page 3.
2
X2
Input
Crystal connection. Connect to a fundamental crystal or leave unconnected for a clock
input.
3
X1/ICLK
Input
Crystal connection. Connect to a fundamental crystal or clock input.
4
VDD
Power
Connect to +3.3 V or 5 V. Must be the same as pin 16.
5
ACS1
Input
A clock select 1. Selects outputs on CLKA1 and CLKA2 per table on page 3. Internal
pull-up.
6
GND
Power
Connect to ground.
7
CLKC1
Output
Output Clock C1. Depends on setting of CCS per table on page 3.
8
CLKC2
Output
Output Clock C2. Depends on setting of CCS per table on page 3. Same as CLKC1.
9
CLKB2
Output
Output Clock B2. Depends on setting of BCS1, 0 per table on page 3.
10
CLKB1
Output
Output Clock B1. Depends on setting of BCS1, 0 per table on page 3.
11
CCS
Input
Clock C select pin. Selects outputs on CLKC1 and CLKC2 per table on page 3.
12
DC
-
13
CLKA2
Output
Output Clock A2. Depends on setting of ACS1, 0 per table on page 3.
Don’t connect. Do not connect anything to this pin.
14
GND
Power
Connect to ground.
15
OE
Input
Output enable. Tri-states all outputs when low. Internal pull-up.
16
VDD
Power
Connect to +3.3 V or 5 V. Must be the same as pin 4.
17
CLKA1
Output
Output Clock A1. Depends on setting of ACS1, 0 per table on page 3.
18
REFOUT
Output
Buffered reference clock output. Same frequency as crystal or clock input.
19
BCS0
Input
B clock select 0. Selects outputs on CLKB1 and CLKB2 per table on page 3.
20
BCS1
Input
B clock select 1. Selects outputs on CLKB1 and CLKB2 per table on page 3. Internal
pull-up.
IDT™ / ICS™ NETWORKING CLOCK SOURCE
2
ICS650-27
REV F 051310
ICS650-27
NETWORKING CLOCK SOURCE
CLOCK SYNTHESIZER
For a 25 MHz fundamental crystal or clock input, the following four tables apply:
A Clocks Select Table (outputs in MHz)
B Clocks Select Table (outputs in MHz)
ASC1
ASC0
CLKA1
CLKA2
BSC1
BSC0
CLKB1
CLKB2
0
0
100
off (low)
0
0
Test
Test
0
M
Test
Test
0
M
66.6667
33.3333
0
1
75
off (low)
0
1
100
50
1
0
33.3333
16.6667
1
0
83.3333
41.6667
1
M
Test
Test
1
M
Test
Test
1
1
66.6667
33.3333
1
1
133.3333
66.6667
C Clocks Select Table (outputs in MHz)
Reference Output Clock Frequency (in MHz)
CCS
CLKC1
CLKC2
REFOUT
0
125
125
25
M
Test
Test
1
75
75
For a 12.5 MHz fundamental crystal or clock input, the following four tables apply:
A Clocks Select Table (outputs in MHz)
B Clocks Select Table (outputs in MHz)
ASC1
ASC0
CLKA1
CLKA2
BSC1
BSC0
CLKB1
CLKB2
0
0
50
off (low)
0
0
Test
Test
0
M
Test
Test
0
M
33.3333
16.6667
0
1
37.5
off (low)
0
1
50
25
1
0
16.6667
8.3333
1
0
41.6667
20.8333
1
M
Test
Test
1
M
Test
Test
1
1
33.3333
16.6667
1
1
66.6667
33.3333
C Clocks Select Table (outputs in MHz)
Reference Output Clock Frequency (in MHz)
CCS
CLKC1
CLKC2
REFOUT
0
62.5
62.5
12.5
M
Test
Test
1
37.5
37.5
0 = connect directly to GND
M = leave unconnected (automatically self biases to VDD/2)
1 = connect directly to VDD
IDT™ / ICS™ NETWORKING CLOCK SOURCE
3
ICS650-27
REV F 051310
ICS650-27
NETWORKING CLOCK SOURCE
CLOCK SYNTHESIZER
External Components
Crystal Information
The ICS650-27 requires a minimum number of external
components for proper operation.
The crystal used should be a fundamental mode (do not use
third overtone), parallel resonant. Crystal capacitors should
be connected from pins X1 to ground and X2 to ground to
optimize the initial accuracy. The value of these capacitors
is given by the following equation:
Crystal caps (pF) = (CL - 6) x 2
Decoupling Capacitor
Decoupling capacitors of 0.01µF must be connected
between each VDD and GND (pins 4 and 6, pins 16 and 14),
as close to the device as possible. For optimum device
performance, the decoupling capacitor should be mounted
on the component side of the PCB. Avoid the use of vias in
the decoupling circuit.
In the equation, CL is the crystal load capacitance. So, for a
crystal with a 16pF load capacitance, two 20 pF [(16-6) x 2]
capacitors should be used.
Series Termination Resistor
When the PCB trace between the clock outputs and the
loads are over 1 inch, series termination should be used. 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.
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS650-27. 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
-40 to +85° C
Storage Temperature
-65 to +150° C
Junction Temperature
175° C
Soldering Temperature
260° C
Recommended Operation Conditions
Parameter
Min.
Ambient Operating Temperature
-40
Power Supply Voltage (measured in respect to GND)
+3.0
IDT™ / ICS™ NETWORKING CLOCK SOURCE
4
Typ.
Max.
Units
+85
°C
+3.3
+3.6
V
ICS650-27
REV F 051310
ICS650-27
NETWORKING CLOCK SOURCE
CLOCK SYNTHESIZER
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V ±10%, Ambient Temperature -40 to +85° C
Parameter
Symbol
Conditions
Operating Voltage
VDD
Input High Voltage
VIH
X1 pin only, CLK input
Input Low Voltage
VIL
X1 pin only, CLK input
Input High Voltage
VIH
all tri-level type inputs
Input Low Voltage
VIL
all tri-level type inputs
Input High Voltage
VIH
all other inputs
Input Low Voltage
VIL
all other inputs
Output High Voltage
VOH
IOH = -25 mA
Output Low Voltage
VOL
IOL = 25mA
Output High Voltage, CMOS level
VOH
IOH = -8 mA
Min.
Typ.
Max.
Units
3.0
3.3
3.6
V
VDD/2+1
VDD/2
VDD/2
V
VDD/2-1
VDD-0.5
V
V
0.5
2
V
V
0.8
2.4
V
V
0.8
VDD-0.4
V
V
Operating Supply Current
IDD
No Load
50
mA
Short Circuit Current
IOS
Each output
±50
mA
Internal pull-up resistor
RPU
BCS1, OE pins
510
kΩ
ACSI pin
120
kΩ
20
Ω
Nominal output impedance
ZOUT
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V±10%, Ambient Temperature -40 to +85° C
Parameter
Symbol
Conditions
Input Frequency
Min.
Typ.
10
12.5 or
25
Max. Units
27
MHz
Output Rise Time
tOR
0.8 to 2.0 V, Note 1
1.5
ns
Output Fall Time
tOF
2.0 to 0.8 V, Note 1
1.5
ns
60
%
0
ppm
Output Clock Duty Cycle
At VDD/2, Note 1
Frequency Error
All clocks
Absolute Jitter, short term
Variation from mean,
Note 1
40
50
±150
ps
Note 1: Measured with 15 pF load
Thermal Characteristics
Parameter
Symbol
Thermal Resistance Junction to Ambient
θJA
Still air
135
° C/W
θJA
1 m/s air flow
93
° C/W
θJA
3 m/s air flow
78
° C/W
60
° C/W
Thermal Resistance Junction to Case
IDT™ / ICS™ NETWORKING CLOCK SOURCE
Conditions
θJC
5
Min.
Typ.
Max. Units
ICS650-27
REV F 051310
ICS650-27
NETWORKING CLOCK SOURCE
CLOCK SYNTHESIZER
Package Outline and Package Dimensions (20-pin SSOP, 150 Mil. Body)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters
20
Symbol
E1
A
A1
A2
b
C
D
E
E1
e
L
α
E
INDEX
AREA
1 2
D
Min
Inches
Max
1.35
1.75
0.10
0.25
-1.50
0.20
0.30
0.18
0.25
8.55
8.75
5.80
6.20
3.80
4.00
0.635 Basic
0.40
1.27
0°
8°
Min
Max
.053
.069
.0040
.010
-.059
0.008
0.012
.007
.010
.337
.344
.228
.244
.150
.157
0.025 Basic
.016
.050
0°
8°
A
A2
A1
c
-Ce
b
SEATING
PLANE
L
.10 (.004)
C
Ordering Information
Part / Order Number
Marking
Shipping Packaging
Package
Temperature
650R-27ILF
650R-27ILFT
650R-27ILF
650R-27ILF
Tubes
Tape and Reel
20-pin SSOP
20-pin SSOP
-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 CLOCK SOURCE
6
ICS650-27
REV F 051310
ICS650-27
NETWORKING CLOCK SOURCE
CLOCK SYNTHESIZER
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