ICS672-01/02
QuadraClock™ Quadrature Delay Buffer
MDS 672-01/02 C 1 Revision 112200
Integrated Circuit Systems, Inc.• 525 Race Street • San Jose •CA•95126• (408) 295-9800 tel • www.icst.com
Block Diagram
Description Features
The ICS672-01 and ICS672-02 are zero delay
buffers that generate four output clocks whose
phases are spaced at 90° intervals. Based on ICS’
proprietary low jitter Phase Locked Loop (PLL)
techniques, each device provides five low skew
outputs, with clock rates up to 84 MHz for the
ICS672-01 and up to 135 MHz for the
ICS672-02. By providing outputs delayed one
quarter clock cycle, the device is useful for systems
requiring early or late clocks.
The ICS672-01/02 include multiplier selections of
x0.5, x1, x2, x3, x4, x5, or x6. They also offer a
mode to power down all internal circuitry and tri
state the outputs. In normal operation, output
clock FBCLK is tied to the FBIN pin.
ICS manufactures the largest variety of clock
generators and buffers, and is the largest clock
supplier in the world.
• Packaged in 16 pin narrow SOIC
• Input clock range from 10 MHz to 150 MHz
• Clock outputs from up to 84 MHz (ICS672-01)
and up to 135 MHz (ICS672-02)
• Zero input-output delay
• Integrated x0.5, x1, x2, x3, x4, x5, or x6 selections
• Four accurate (<250 ps) outputs with 0°, 90°,
180°, and 270° phase shift from ICLK, and one
FBCLK (0°)
• Separate supply for output clocks from 2.5V to 5V
• Full CMOS outputs (TTL compatible)
• Tri state mode for board-level testing
• Includes Power Down for power savings
• Advanced, low power, sub-micron CMOS process
• 3.3 V to 5 V operating voltage
• Industrial temperature version available
PLL
Multiplier
and
Quadrature
Generation
FBIN
S2:S0 3
CLK0
CLK90
CLK180
CLK270
CLKFB
Control
Logic
IN
GND VDDIOVDD
2 3
Power Down + Tri-State
External Feedback
ICS672-01/02
QuadraClock™ Quadrature Delay Buffer
MDS 672-01/02 C 2 Revision 112200
Integrated Circuit Systems, Inc.• 525 Race Street • San Jose •CA•95126• (408) 295-9800 tel • www.icst.com
Pin Descriptions
Key: I = Input; O = output; P = power supply connection.
Pin Assignment
ICS672-01/02
External Components
The ICS672-01/01 requires a minimum number of external components for proper operation. Decoupling
capacitors of 0.01µF should be connected between VDD and GND on pins 11 and 12, VDD and GND
on pins 13 and 12, and VDDIO and GND on pins 5 and 6, as close to the device as possible. A series
termination resistor of 33 Ω may be used close to each clock output pin to reduce reflections.
16
15
14
13
16 pin narrow (150 mil) SOIC
12
11
10
9
1
2
3
4
5
6
7
8
CLK90
VDDIO
FBINICLK
CLK270
S0
GND
GND
VDD
GND
S2
S1
VDD
FBCLK
CLK0CLK180
Number Name Type Description
1ICLK I Clock Input.
2 CLK90 O Clock Output (90° delayed from CLK0).
3 CLK180 O Clock Output (180° delayed from CLK0).
4 CLK270 O Clock Output (270° delayed from CLK0).
5VDDIO P Supply voltage for input and output clocks. Must not exceed VDD.
6, 7, 12 GND P Connect to ground.
8 S0 I Select input 0. See table above.
9S1 I Select input 1. See table above.
10 S2 I Select input 2. See table above.
11, 13 VDD P Connect to +3.3 V or +5.0 V.
14 CLK0 O Clock Output phase aligned to ICLK.
15 FBCLK O Feedback Clock Output (0° phase shift from CLK0).
16 FBIN I Feedback Clock Input. In normal operation, connect to FBCLK
S2 S1 S0 Output Clocks
000Power Down + Tri State
001 x1
0 1 0 x2
0 1 1 x3
1 0 0 x4
1 0 1 x5
1 1 0 x6
1 1 1 x0.5
Output Clock Mode Select Table
ICS672-01/02
QuadraClock™ Quadrature Delay Buffer
MDS 672-01/02 C 3 Revision 112200
Integrated Circuit Systems, Inc.• 525 Race Street • San Jose •CA•95126• (408) 295-9800 tel • www.icst.com
Operation and Applications
The ICS672-01/02 each provide a total of five output clocks with multiple phase shifts relative to the input
clock (ICLK). Phase shifts of 0° (CLK0), 90° (CLK90), 180° (CLK180), and 270° (CLK270) are provided,
plus one feedback clock (FBCLK). All output clocks will be a multiple of the input clock, as determined by
the table on page 2. Refer to the illustrations in Figure 1 and Figure 2.
FBCLK is connected to the feedback input (FBIN) to provide a zero delay through the ICS672-01/02.
FBCLK has a 0° phase shift from ICLK.
Figure 1. Phase alignment of input and output clocks. (x1 multiplier)
CLK90
CLK180
CLK0,
FBCLK
CLK270
ICLK
Figure 2. Phase alignment of input and output clocks. (x2 multiplier)
CLK90
CLK180
CLK0,
FBCLK
CLK270
ICLK
ICS672-01/02
QuadraClock™ Quadrature Delay Buffer
MDS 672-01/02 C 4 Revision 112200
Integrated Circuit Systems, Inc.• 525 Race Street • San Jose •CA•95126• (408) 295-9800 tel • www.icst.com
Parameter Conditions Minimum Typical Maximum Units
ABSOLUTE MAXIMUM RATINGS (note 1)
ABSOLUTE MAXIMUM RATINGS (note 1)
Supply voltage, VDD & VDDIO Referenced to GND -0.5 7 V
Inputs and Clock Outputs Referenced to GND -0.5 VDD+0.5 V
Electrostatic Discharge MIL-STD-883 2000 V
Ambient Operating Temperature 0 70 °C
Ambient Operating Temperature, Industrial Available on -02 only -40 85 °C
Soldering Temperature Max of 10 seconds 260 °C
Junction temperature 150 °C
Storage temperature -65 150 °C
DC CHARACTERISTICS (VDD =VDDIO = 3.3 V unless specified otherwise)
DC CHARACTERISTICS (VDD =VDDIO = 3.3 V unless specified otherwise)
DC CHARACTERISTICS (VDD =VDDIO = 3.3 V unless specified otherwise)
DC CHARACTERISTICS (VDD =VDDIO = 3.3 V unless specified otherwise)
Operating Voltage, VDD 3.13 5.50 V
Operating Voltage, VDDIO 2.375 VDD V
Input High Voltage, VIH, ICLK only VDD/2+1 V
Input Low Voltage, VIL, ICLK only VDD/2-1 V
Input High Voltage, VIH 2 V
Input Low Voltage, VIL 0.8 V
Output High Voltage, VOH IOH=-12 mA 2.4 V
Output Low Voltage, VOL IOL=12 mA 0.4 V
Output High Voltage, VOH, CMOS level IOH=-8mA VDDIO-0.4 V
Operating Supply Current, IDD (Note 2) No Load, S1=1, S0=0, S2=0 11 mA
Operating Supply Current, IDD (Note 3) No Load, S1=1, S0=0, S2=0 22 mA
Short Circuit Current Each output ±50 mA
Input Capacitance 7 pF
AC CHARACTERISTICS (VDD = VDDIO = 3.3 V unless specified otherwise)
AC CHARACTERISTICS (VDD = VDDIO = 3.3 V unless specified otherwise)
AC CHARACTERISTICS (VDD = VDDIO = 3.3 V unless specified otherwise)
AC CHARACTERISTICS (VDD = VDDIO = 3.3 V unless specified otherwise)
Input Clock Frequency 15 150 MHz
Output Clock Frequency ICS672-01 15 84 MHz
Output Clock Frequency ICS672-02 15 135 MHz
Output Clock Rise Time, CL = 15 pF 0.8 to 2.0V 1.5 ns
Output Clock Fall Time, CL = 15 pF 2.0 to 0.8V 1.5 ns
Output Clock Duty Cycle, VDDIO=3.3V At VDDIO/2 45 50 55 %
Phased Outputs Accuracy (Note 4) rising edges at VDDIO/2 -250 250 ps
Input to Output Skew, ICLK to CLK0 (Note 5) -300 300 ps
Maximum Absolute Jitter 75 ps
Cycle to Cycle Jitter, 15 pF loads 150 ps
Electrical Specifications
Notes: 1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged
exposure to levels above the operating limits but below the Absolute Maximums may affect device reliability.
2. With ICLK = 20 MHz, FBCLK to FBIN, all outputs at 40 MHz.
3. With ICLK = 66.5 MHz, FBCLK to FBIN, all outputs at 133 MHz.
4. With CLK0:CLK270 equally loaded, and output frequency > 60 MHz.
5. Rising edge of ICLK compared with rising edge of CLK0, with FBCLK connected to FBIN, 15 pF load on CLK0, and
CLK0 > 60 MHz.
ICS672-01/02
QuadraClock™ Quadrature Delay Buffer
MDS 672-01/02 C 5 Revision 112200
Integrated Circuit Systems, Inc.• 525 Race Street • San Jose •CA•95126• (408) 295-9800 tel • www.icst.com
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) 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 ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does
not authorize or warrant any ICS product for use in life support devices or critical medical instruments.
Ordering Information
Part/Order Number Marking Shipping packaging Package Temperature
ICS672M-01 ICS672M-01 tubes 16 pin SOIC 0 to 70 °C
ICS672M-01T ICS672M-01 tape and reel 16 pin SOIC 0 to 70 °C
ICS672M-02 ICS672M-02 tubes 16 pin SOIC 0 to 70 °C
ICS672M-02T ICS672M-02 tape and reel 16 pin SOIC 0 to 70 °C
ICS672M-02I ICS672M-02I tubes 16 pin SOIC -40 to 85 °C
ICS672M-02IT ICS672M-02I tape and reel 16 pin SOIC -40 to 85 °C
16 pin SOIC narrow
Inches
Inches
Millimeters
Symbol Min Max Min Max
A0.0532 0.0688 1.35 1.75
A1 0.0040 0.0098 0.10 0.24
B 0.0130 0.0200 0.33 0.51
C0.0075 0.0098 0.19 0.24
D 0.3859 0.3937 9.80 10.00
E 0.1497 0.1574 3.80 4.00
e
.050 BSC
.050 BSC
1.27 BSC
H 0.2284 0.2440 5.80 6.20
h 0.0099 0.0195 0.25 0.50
L 0.0160 0.0500 0.41 1.27
B
D
E H
e
A1 C A
h x 45°
L
INDEX
AREA
1 2
Package Outline and Package Dimensions
(For current dimensional specifications, see JEDEC Publication No. 95.)