PRELIMINARY INFORMATION
ICS570B
Multiplier and Zero Delay Buffer
Features
• Packaged in 8 pin SOIC.
• Pin-for-pin replacement and upgrade to
ICS570/ICS570A
• Functional equivalent to AV9170 (not a pin-
for-pin replacement).
• Low input to output skew of 300 ps max (>60 MHz
outputs).
• Low skew (100 ps) outputs.
• Ability to choose between 14 different
multipliers from 0.5X to 32X.
• Input clock frequency up to 150 MHz at 3.3V.
• Can recover degraded input clock duty cycle.
• Output clock duty cycle of 45/55.
• Power Down and Tri-State Mode.
• Full CMOS clock swings with 25mA drive
capability at TTL levels.
• Advanced, low power CMOS process.
• Operating voltage of 3.3 V (±5%).
• Industrial temperature version available
Description
The ICS570B is a high performance Zero Delay Buffer
(ZDB) which integrates ICS’ proprietary analog/digital
Phase Locked Loop (PLL) techniques. The ICS570B,
part of ICS’ ClockBlocks™ family, was designed as a
performance upgrade to meet today’s higher speed and
lower voltage requirements. 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 device incorporates an all-chip power down/tri-state
mode that stops the internal PLL and puts both outputs
into a high impedance state.
The ICS570B is ideal for synchronizing outputs in a large
variety of systems, from personal computers to data
communications to graphics/video. By allowing off-chip
feedback paths, the device can eliminate the delay
through other devices.
The ICS570B was done to improve input to output jitter
from the original ICS570M and ICS570A verisons, and is
recommended for all new 3.3 V only designs.
For 5V applications, use the ICS570A.
Block Diagram
ICLK
S1, S0
2
FBIN
divide by N
Phase
Detector,
Charge
Pump, and
Loop Filter
Voltage
Controlled
Oscillator
÷2
Output
Buffer
CLK
Output
Buffer
CLK/2
External feedback can come from CLK or CLK/2 (see table on page 2).
MDS 570B A
1
Revision 053001
Integrated Circuit Systems, Inc . • 525 Race Street • San Jose • CA • 95126 • (408)295-9800tel • www.icst.com
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
