The ICS601-25 is a low-cost, low phase noise, high
performance clock synthesizer for applications which
require low phase noise, low jitter, and low skew fanout. It is
IDT’s lowest phase noise multiplier, and also the lowest
CMOS part in the industry. Using IDT’s patented analong
and digital Phase Locked Loop (PLL) techniques, the chip
accepts a 10-27 MHz crystal or clock input, and produces
output clocks up to 156 MHz.
ICS601-25
Features
•
•
•
•
•
•
•
•
•
•
•
•
Packaged in 20-pin SSOP
Uses fundamental 10 - 27 MHz crystal or clock
Output clocks up to 156 MHz
Low phase noise: -132 dBc/Hz at 10 kHz
Five low skew (<250 ps) outputs
Low jitter - 18 ps one sigma at 125 MHz
Full swing CMOS outputs with 25 mA drive capability at
TTL levels
Powerdown mode lowers power consumption
Advanced, low power, sub-micron CMOS process
Industrial temperature version available
Pb (lead) free package
Operating voltage of 3.3 V
Block Diagram
VDD
5
Reference
Divider
Phase
Comparator
Charge
Pump
Loop
Filter
VCO
CLK1
CLK2
X1/ICLK
Crystal or
clock input
Crystal
Oscillator
X2
VCO
Divide
CLK3
CLK4
CLK5
ROM Based
Multipliers
4
S3:0
3
GND
PD
IDT™ / ICS™
LOW PHASE NOISE 1 TO 5 CLOCK MULTIPLIER
1
ICS601-25
REV E 051310
ICS601-25
LOW PHASE NOISE 1 TO 5 CLOCK MULTIPLIER
CLOCK MULTIPLIER
Pin Assignment
X1/ICLK
VDD
S0
VDD
VDD
S1
GND
S3
PD
S2
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
X2
GND
VDD
CLK2
CLK3
GND
CLK4
CLK5
VDD
CLK1
Output Select Table
S3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
S2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
S1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
S0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Multiplier
x1
x2
x3
x4
x5
x6
x8
x16
x7
x9
x10
x11
x12
output tristates
x14
x15
20 Pin (150 mil) SSOP
Pin Descriptions
Pin
Number
1
2
3
4, 5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin
Name
X1/ICLK
VDD
S0
VDD
S1
GND
S3
PD
S2
CLK1
VDD
CLK5
CLK4
GND
CLK3
CLK2
VDD
GND
X2
Pin
Type
XI
Power
Input
Power
Input
Power
Input
Input
Input
Output
Power
Output
Output
Power
Output
Output
Power
Power
XO
Pin Description
Crystal or clock input. Connect to a 10-27 MHz fundamental parallel mode
crystal or clock input.
Connect to +3.3 V.
Select pin 0. Internal pull-up.
Connect to +3.3 V.
Select pin 1. Internal pull-up.
Connect to ground.
Select pin 3. Internal pull-down.
Powerdown when held low. Internal pull-up.
Select pin 2. Internal pull-up.
Clock output.
Connect to +3.3 V.
Clock output.
Clock output.
Connect to ground.
Clock output.
Clock output.
Connect to +3.3 V.
Connect to ground.
Crystal connection. Connect to a 10-27 MHz fundamental parallel mode
crystal or leave unconnected for clock input.
IDT™ / ICS™
LOW PHASE NOISE 1 TO 5 CLOCK MULTIPLIER
2
ICS601-25
REV E 051310
ICS601-25
LOW PHASE NOISE 1 TO 5 CLOCK MULTIPLIER
CLOCK MULTIPLIER
External Components
The ICS601-25 requires a minimum number of external components for proper operation. Decoupling capacitors of
0.01
µF
and 0.1
µF
should be connected between VDD and GND, as close to the part as possible. A 33Ω series
terminating resistor should be used on each clock output. The crystal must be connected as close to the chip as
possible. The crystal should be fundamental mode, parallel resonant. Do not use third overtone. For exact tuning
when using a crystal, capacitors should be connected from pins X1 to ground and X2 to ground. In general, the
value of these capacitors is given by the following equation, where CL is the crystal load capacitance: Crystal caps
(pF) = (CL-5) x 2. So for a crystal with 16 pF load capacitance, two 22 pF caps can be used. For any given board
layout, ICS can measure the board capacitance and recommend the exact capacitance value to use.
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS601-25. 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
Supply Voltage, VDD
All Inputs and Outputs
Ambient Operating Temperature, Commercial version
Ambient Operating Temperature, Industrial version
Storage Temperature
Junction Temperature
Soldering Temperature
7V
Rating
-0.5 V to VDD+0.5 V
0 to +70
°
C
-40 to +85
°
C
-65 to +150
°
C
125
°
C
260
°
C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature (commercial)
Ambient Operating Temperature (industrial)
Power Supply Voltage (measured in respect to GND)
Min.
0
-40
+2.97
Typ.
Max.
+70
+85
+3.63
Units
°
C
°
C
V
DC Electrical Characteristics
VDD=3.3 V ±10%
, Ambient temperature -40 to +85° C
Parameter
Operating Voltage
Input High Voltage
Input Low Voltage
Symbol
VDD
V
IH
V
IL
Conditions
X1/ICLK pin only
X1/ICLK pin only
Min.
2.97
VDD/2+1
Typ.
Max.
3.63
VDD/2-1
Units
V
V
V
IDT™ / ICS™
LOW PHASE NOISE 1 TO 5 CLOCK MULTIPLIER
3
ICS601-25
REV E 051310
ICS601-25
LOW PHASE NOISE 1 TO 5 CLOCK MULTIPLIER
CLOCK MULTIPLIER
DC Electrical Characteristics
(continued)
Parameter
Input High Voltage
Input Low Voltage
Output High Voltage, CMOS
level
Output High Voltage
Output Low Voltage
Operating Supply Current
Short Circuit Current
Input Capacitance
Output Impedance
On Chip Pull-up Resistor
On Chip Pull-down Resistor
Z
OUT
R
PU
R
PD
S2, S1, S0, PD
pins
S3 pin
Symbol
V
IH
V
IL
V
OH
V
OH
V
OL
IDD
I
OS
Conditions
Min.
2
Typ.
Max.
VDD
0.8
Units
V
V
V
V
I
OH
= -4 mA
I
OL
= -12 mA
I
OL
= 12 mA
No load, 125 MHz
Each output
Select pins
VDD-0.4
2.4
0.4
45
± 40
± 60
5
20
510
240
60
V
mA
mA
pF
Ω
kΩ
kΩ
AC Electrical Characteristics
VDD = 3.3V ±10%
, Ambient Temperature -40 to +85° C
Parameter
Input Frequency
Output Frequency
Output Rise Time
Output Fall Time
Output Clock Duty Cycle
Maximum Absolute jitter, short
term, 125 MHz
Maximum jitter, one sigma, 125
MHz (x5)
Phase Noise, relative to carrier,
125 MHz (x5)
Phase Noise, relative to carrier,
125 MHz (x5)
Phase Noise, relative to carrier,
125 MHz (x5)
Phase Noise, relative to carrier,
125 MHz (x5)
Output to Output Skew
Note 1: Measured with 15 pF load
t
OR
t
OF
At 3.3V
0.8 to 2.0 V, Note 1
0.8 to 2.0 V, Note 1
At VDD/2, Note 1
Note 1
Note 1
100 Hz offset
1 kHz
10 kHz offset
100 kHz offset
25M in, 125M out,
Note 1
-90
-115
-118
-115
45
50
±50
18
-95
-120
-123
-120
250
Symbol
Conditions
Min.
10
Typ.
Max. Units
27
156
1.5
1.5
55
±75
25
MHz
MHz
ns
ns
%
ps
ps
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
ps
IDT™ / ICS™
LOW PHASE NOISE 1 TO 5 CLOCK MULTIPLIER
4
ICS601-25
REV E 051310
ICS601-25
LOW PHASE NOISE 1 TO 5 CLOCK MULTIPLIER
CLOCK MULTIPLIER
Package Outline and Package Dimensions
(20-pin SSOP, 150 Mil. Narrow Body)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters
20
Inches*
Min
Max
Symbol
Min
Max
E1
INDEX
AREA
E
1 2
D
A
A1
A2
b
C
D
E
E1
e
L
α
aaa
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°
--
0.10
.0532
.0688
.0040 0.0098
--
.059
0.008
0.012
.007
.010
.337
.344
.228
.244
.1497
.1574
0.025 Basic
.016
.050
0°
8°
--
0.004
A2
A1
A
*For reference only. Controlling dimensions in mm.
c
-C-
e
b
SEATING
PLANE
L
aaa
C
Ordering Information
Part / Order Number
601R-25LF
601R-25LFT
601R-25ILF
601R-25ILFT
Marking
601R-25LF
601R-25LF
601R-25ILF
601R-25ILF
Shipping Packaging
Tubes
Tape and Reel
Tubes
Tape and Reel
Package
20-pin SSOP
20-pin SSOP
20-pin SSOP
20-pin SSOP
Temperature
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 Circuit Systems (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
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