The ICS571 is a high speed, high output drive, low
phase noise Zero Delay Buffer (ZDB) which
integrates ICS’ proprietary analog/digital Phase
Locked Loop (PLL) techniques. ICS introduced
the world standard for these devices in 1992 with
the debut of the AV9170, and updated that with
the ICS570. The ICS571, part of ICS’
ClockBlocks™ family, was designed to operate at
higher frequencies, with faster rise and fall times,
and with lower phase noise. The zero delay feature
means that the rising edge of the input clock aligns
with the rising edges of both outputs, giving the
appearance of no delay through the device. There
are two outputs on the chip, one being a low-skew
divide by two of the other.
The chip is ideal for synchronizing outputs in a
large variety of systems, from personal computers
to data communications to video. By allowing offchip feedback paths, the ICS571 can eliminate the
delay through other devices. The use of dividers in
the feedback path will enable the part to multiply
by more than two.
Features
• Packaged in 8 pin SOIC.
• Can function as low phase noise x2 multiplier.
• Low skew outputs. One is ÷2 of other.
• Input clock frequency up to 160 MHz at 3.3V.
• Phase noise of better than -100 dBc/Hz from
1kHz to 1MHz offset from carrier
• Can recover poor input clock duty cycle.
• Output clock duty cycle of 45/55 at 3.3V.
• High drive strength for >100 MHz outputs.
• Full CMOS clock swings with 25mA drive
capability at TTL levels.
• Advanced, low power CMOS process.
• Operating voltages of 3.0 to 5.5 V.
Block Diagram
ICLK
FBIN
External feedback can come from CLK or CLK/2 (see table on page 2).
1ICLKCIReference clock input.
2VDDPConnect to +3.3V or +5V. Must be same as other VDD.
3GNDPConnect to ground.
4CLK/2OClock output per Table above. Low skew divide by two of pin 7 clock.
5GNDPConnect to ground.
6VDDPConnect to +3.3V or +5V. Must be same as other VDD.
7CLKOClock output per Table above.
8FBINCIFeedback clock input. Connect to CLK or CLK/2 per table above.
Key: CI = clock input, I = input, O = output, P = power supply connection
External Components
The ICS571 requires a 0.01 µF decoupling capacitor to be connected between VDD and GND on each
side of the chip (between pins 2 and 3, and also between pins 6 and 5). They must be connected close to
the ICS571 to minimize lead inductance. No external power supply filtering is required for this device.
A 33 Ω terminating resistor can be used next to each output pin.
DC CHARACTERISTICS (VDD = 5.0V or 3.3V unless otherwise noted)
AC CHARACTERISTICS (VDD = 5.0V or 3.3V unless otherwise noted)
ICS571
Low Phase Noise Zero Delay Buffer
Electrical Specifications
ParameterConditionsMinimumTypicalMaximumUnits
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage, VDDReferenced to GND7V
InputsReferenced to GND-0.5VDD+0.5V
Clock OutputReferenced to GND-0.5VDD+0.5V
Ambient Operating Temperature070°C
Soldering TemperatureMax of 10 seconds260°C
Storage temperature-65150°C
Operating Voltage, VDD 35.5V
Input High Voltage, VIH, ICLK, FBINPins 1, 8VDD/2+1VDD/2V
Input Low Voltage, VIL, ICLK, FBINPins 1, 8VDD/2VDD/2-1V
Output High Voltage, VOH, CMOS levelIOH=-4mAVDD-0.4V
Output High Voltage, VOHIOH=-25mA2.4V
Output Low Voltage, VOLIOL=25mA0.4V
IDD Operating Supply Current, 133 in, 133 out No Load, 3.3V34mA
IDD Operating Supply Current, 50 in, 100 outNo Load, 3.3V26mA
Short Circuit CurrentEach Output±100mA
Input Capacitance, ICLK, FBIN5pF
Input Frequency, clock inputFB from CLK20160MHz
Input Frequency, clock inputFB from CLK/21080MHz
Skew CLK/2 with respect to CLKNote 2150500850ps
Input clock to output connected to FBINNote 2-500500ps
Output Clock Rise Time, 5V0.8 to 2.0V, 15 pF load0.3ns
Output Clock Fall Time, 5V2.0 to 0.8V, 15 pF load0.4ns
Output Clock Rise Time, 3.3V0.8 to 2.0V, 15 pF load0.45ns
Output Clock Fall Time, 3.3V2.0 to 0.8V, 15 pF load0.55ns
Output Clock Duty Cycle, 5Vat VDD/24052 to 5560%
Output Clock Duty Cycle, 3.3Vat VDD/24549 to 5155%
Absolute Clock Period Jitter, CLK, note 3Deviation from mean±80ps
One Sigma Clock Period Jitter, CLK, note 350ps
Phase Noise, relative to carrier1kHz offset-105dBc/Hz
Phase Noise, relative to carrier100kHz offset-115dBc/Hz
Notes: 1. Stresses beyond these can permanently damage the device.
2. Assumes clocks with same rise time, measured from rising edges at VDD/2. Measured with 33Ω
termination resistors and 15 pF loads. Applies to both 3.3V and 5V operation.
3. CLK/2 has lower jitter (both absolute and one sigma, in ps) than CLK.
ICS571MTICS571M8 pin SOIC on tape and reel0 to 70 °C
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (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.
ClockBlocks is a trademark of ICS
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