ICS671-03
3.3 Volt Zero Delay, Low Skew Buffer
MDS 671-03 A 1 Revision 072501
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408) 295-9800 tel • www.icst.com
PRELIMINARY INFORMATION
Block Diagram
Description Features
The ICS671-03 is a low phase noise, high speed PLL
based, 8 output, low skew zero delay buffer. Based on
ICS’s proprietary low jitter Phase Locked Loop (PLL)
techniques, the device provides eight low skew
outputs at speeds up to 133 MHz at 3.3 V. The
outputs can be generated from the PLL (for zero
delay), or directly from the input (for testing), and can
be set to tri-state mode or to stop at a low level. For
normal operation as a zero delay buffer, any output
clock 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 (150 mil) SOIC
• Clock outputs from 10 to 133 MHz
• Zero input-output delay
• Eight low-skew (<200 ps) outputs
• Device-to-device skew <700 ps
• Low jitter (<200 ps)
• Full CMOS outputs with 25 mA output drive
capability at TTL levels
• 5 V tolerant FBIN and CLKIN pins
• Tri-state mode for board-level testing
• Advanced, low power, sub-micron CMOS process
• 3.3 V operating voltage
• Industrial temperature range of -40 to 85 °C
Clock
Synthesis
PLL
CLKA1
FBIN
CLKA2
S2, S1 2
CLKA3
CLKA4
CLKB1
CLKB2
CLKB3
CLKB4
Control
Logic
CLKIN
Feedback is shown from CLKB4 for illustration, but may
come from any output.
ICS671-03
3.3 Volt Zero Delay, Low Skew Buffer
MDS 671-03 A 2 Revision 072501
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408) 295-9800 tel • www.icst.com
PRELIMINARY INFORMATION
Pin Descriptions
Key: I = Input; O = output; P = power supply connection. Outputs have a weak internal pull-down when in tri-state
mode.
Pin Assignment
External Components
The ICS671-03 requires a minimum number of external components for proper operation. Decoupling capacitors of
0.01µF should be connected between VDD and GND on pins 4 and 5, and VDD and GND on pins 13 and 12, 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
CLKA1
GND
FBINCLKIN
VDD
S2
CLKB1
CLKB2
VDD
GND
CLKB3
S1
CLKB4
CLKA4
CLKA3CLKA2
Number Name Type Description
1CLKIN I Clock Input. (5 V tolerant)
2, 3, 14, 15 CLKA1:A4 O Clock Outputs A1:A4. See above table. Outputs have weak pulldown resistors.
4, 13 VDD P Power supply. Connect both pins to 3.3 V.
5, 12 GND P Connect to ground.
6, 7, 10, 11 CLKB1:B4 O Clock Outputs B1:B4. See above table. Outputs have weak pulldown resistors.
8S2 I Select input 2. See table above. Internal pull-up.
9S1 I Select input 1. See table above. Internal pull-up.
16 FBIN I Feedback Input. Connect to any output under normal operation. (5 V tolerant)
S2 S1 CLKA1:A4 CLKB1:B4 A & B Source PLL Status
0 0 Tri-state (Note 1) Tri-state (Note 1) PLL ON
0 1 Stopped Low Stopped Low none OFF
1 0 Running Running CLKIN (Note 2) OFF
1 1 Running Running PLL ON
Output Clock Mode Select Table
Notes: 1. Outputs are in high impedance state with weak pulldowns.
2. Buffer mode only; not zero delay between input and output.
ICS671-03
3.3 Volt Zero Delay, Low Skew Buffer
MDS 671-03 A 3 Revision 072501
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408) 295-9800 tel • www.icst.com
PRELIMINARY INFORMATION
Parameter Conditions Minimum Typical Maximum Units
ABSOLUTE MAXIMUM RATINGS (note 1)
Supply voltage, VDD Referenced to GND -0.5 7 V
Inputs and Clock Outputs Referenced to GND -0.5 VDD+0.5 V
CLKIN and FBIN Inputs -0.5 5.5
Electrostatic Discharge MIL-STD-883 2000 V
Ambient Operating Temperature -40 85 °C
Soldering Temperature Max of 10 seconds 260 °C
Junction temperature 150 °C
Storage temperature -65 150 °C
DC CHARACTERISTICS (VDD = 3.3 V unless specified otherwise)
DC CHARACTERISTICS (VDD = 3.3 V unless specified otherwise)
DC CHARACTERISTICS (VDD = 3.3 V unless specified otherwise)
Operating Voltage, VDD 3.00 3.60 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 VDD-0.4 V
Operating Supply Current, IDD (Note 2) No Load, S2=1, S1=1 70 mA
Power Down Supply Current, IDD CLKIN=0, S2=0, S1=1 1.3 mA
CLKIN=0 (Note 3) 1.3 mA
Short Circuit Current Each output ±50 mA
Input Capacitance S2, S1, FBIN 5 pF
AC CHARACTERISTICS (VDD = 3.3 V unless specified otherwise)
AC CHARACTERISTICS (VDD = 3.3 V unless specified otherwise)
AC CHARACTERISTICS (VDD = 3.3 V unless specified otherwise)
Input Clock Frequency See table on page 2 10 133 MHz
Output Clock Frequency See table on page 2 10 133 MHz
Output Clock Rise Time, CL=30pF 0.8 to 2.0V 1.5 ns
Output Clock Fall Time, CL=30pF 2.0 to 0.8V 1.25 ns
Output Clock Duty Cycle, VDD=3.3V At VDD/2 45 50 55 %
Device to Device Skew, equally loaded rising edges at VDD/2 700 ps
Output to Output Skew, equally loaded rising edges at VDD/2 200 ps
Input to Output Skew, FBIN to CLKA4, S1=1, S0 =1
(Note 2)
rising edges at VDD/2 ±250 ps
Maximum Absolute Jitter 130 ps
Cycle to Cycle Jitter, 30pF loads 300 ps
PLL Lock Time (Note 4) 1.0 ms
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 CLKIN = 100 MHz, FBIN to CLKA4, all outputs at 100 MHz.
3. When there is no clock signal present at CLKIN, the ICS671-03 will enter a power down mode. The PLL is
stopped and the outputs are tri-state.
4. With VDD at a steady state, and valid clocks at CLKIN and FBIN.
ICS671-03
3.3 Volt Zero Delay, Low Skew Buffer
MDS 671-03 A 4 Revision 072501
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408) 295-9800 tel • www.icst.com
PRELIMINARY INFORMATION
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
ICS671M-03I ICS671M-03I tubes 16 pin SOIC -40 to +85 °C
ICS671M-03IT ICS671M-03I tape and reel 16 pin SOIC -40 to +85 °C
16 pin SOIC narrow
Inches
Inches
Millimeters
Millimeters
Symbol Min Max Min Max
A0.0532 0.0688 1.35 1.75
A1 0.0040 0.0098 0.10 0.24
B0.0130 0.0200 0.33 0.51
C0.0075 0.0098 0.19 0.24
D0.3859 0.3937 9.80 10.00
E0.1497 0.1574 3.80 4.00
e
.050 BSC
.050 BSC
1.27 BSC
1.27 BSC
H0.2284 0.2440 5.80 6.20
h0.0099 0.0195 0.25 0.50
L0.0160 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.)
