ICS275 Datasheet, PDF (1/8 Pages) Integrated Circuit Systems – Triple PLL Field Programmable VCXO Clock Synthesizer

PRELIMINARY INFORMATION
ICS275
Triple PLL Field Programmable VCXO Clock Synthesizer
Description
The ICS275 field programmable VCXO clock
synthesizer generates up to four 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 ICS275 contains a One-Time
Programmable (OTP) ROM for field programmability.
Programming features include VCXO, eight selectable
configuration registers and up to two sets of two
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 ICS275 is also available in factory programmed
custom versions for high-volume applications.
Features
• Packaged as 16-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 four reference outputs
• Up to two sets of two 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
MDS 275 B
1
Revision 040805
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel [phone] ● www.icst.com