ICS270 Datasheet, PDF (1/8 Pages) Integrated Circuit Systems – Triple PLL Field Programmable VCXO Clock Synthesizer

PRELIMINARY INFORMATION
ICS270
Triple PLL Field Programmable VCXO Clock Synthesizer
Description
The ICS270 field programmable VCXO clock
synthesizer generates up to eight high-quality,
high-frequency clock outputs including multiple
reference clocks from a low-frequency crystal input. It
is designed to replace crystals and crystal oscillators in
most electronic systems.
Using ICS’ VersaClock^TM software to configure PLLs
and outputs, the ICS270 contains a One-Time
Programmable (OTP) ROM for field programmability.
Programming features include VCXO, eight selectable
configuration registers and up to two sets of four
low-skew outputs.
Using Phase-Locked Loop (PLL) techniques, the
device runs from a standard fundamental mode,
inexpensive crystal, or clock. It can replace VCXOs,
multiple crystals and oscillators, saving board space
and cost.
The ICS270 is also available in factory programmed
custom versions for high-volume applications.
Features
• Packaged as 20-pin TSSOP
• Eight addressable registers
• Replaces multiple crystals and oscillators
• Output frequencies up to 200 MHz at 3.3 V
• Input crystal frequency of 5 to 27 MHz
• Up to eight reference outputs
• Up to two sets of four low-skew outputs
• Operating voltages of 3.3 V
• Controllable output drive levels
• Advanced, low-power CMOS process
• Available in Pb (lead) free packaging
Block Diagram
VDD ³
3
S2:S0
OTP
ROM
with
PLL
Values
VIN
X1
Crystal
X2
Voltage
Controlled
Crystal
Oscillator
External capacitors
are required.
PLL1
PLL2
PLL3
Divide
Logic
and
Output
Enable
Control
GND 2
PDTS
CLK1
CLK2
CLK3
CLK4
CLK5
CLK6
CLK7
CLK8
MDS 270 B
1
Revision 040705
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel [phone] ● www.icst.com