ICS252
Field Programmable Dual Output SS VersaClock Synthesizer
Description
Features
The ICS252 is a low cost, dual-output, field
• 8-pin SOIC package
programmable clock synthesizer. The ICS252 can
generate two output frequencies from 314 kHz to 200
MHz using up to two independently configurable PLLs.
The outputs may employ Spread Spectrum techniques
to reduce system electro-magnetic interference (EMI).
• Two addressable registers
• Input crystal frequency of 5 to 27 MHz
• Clock input frequency of 3 to 150 MHz
• Output clock frequencies up to 200 MHz
• Configurable Spread Spectrum Modulation
™
Using ICS’ VersaClock software to configure the PLL
and output, the ICS252 contains a One-Time
Programmable (OTP) ROM to allow field
programmability. Programming features include 4
selectable configuration registers.
• Operating voltage of 3.3 V
• Replaces multiple crystals and oscillators
• Controllable output drive levels
• Advanced, low-power CMOS process
• Available in Pb (lead) free packaging
The device employs Phase-Locked Loop (PLL)
techniques to run from a standard fundamental mode,
inexpensive crystal, or clock. It can replace multiple
crystals and oscillators, saving board space and cost.
The device also has a power-down feature that
tri-states the clock outputs and turns off the PLLs when
the PDTS pin is taken low.
The ICS252 is also available in factory programmed
custom versions for high-volume applications.
Block Diagram
VDD
OTP
SEL
PLL1
PLL2
Divide
Logic
and
Output
Enable
Control
ROM
with
CLK1
CLK2
PLL
Values
X1
Crystal
Oscillator
Crystal
X2
GND
External capacitors
are required.
PDTS
MDS 252 B
1
Revision 011606
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
