ICS7152
MDS 7152 E 1 Revision 012306
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
Spread Spectrum Clock Generator
Description
The ICS7152-01, -02, -11, and -12 are clock
generators for EMI (Electro Magnetic Interference)
reduction (see below for frequency ranges and
multiplier ratios). Spectral peaks can be attenuated by
slightly modulating the oscillation frequency. Both down
and center spread profiles are selectable. Center
spread maintains an average frequency equal to an
unspread clock. Down spread meets maximum
frequency specs over the entire modualtion cycle.
Features
• Operating voltage of 3.3 V ±0.3 V
• Packaged in 8-pin SOIC
• Input frequency range of 16.6 to 134.0 MHz
• Output frequency range of 16.6 to 134.0 MHz
• Provides a spread spectrum clock output (±0.5%,
±1.5% center spread; -1.0%, -3.0% down spread)
• Advanced, low-power CMOS process
• Industrial temperature range available
• Available in Pb (lead) free package
Block Diagram
Product Lineup
Product Input Frequency Range Modulation Type Modulation Enable Pin
ICS7152M-01, ICS7152MI-01 16.6 MHz to 67 MHz
Down spread
Ye s
ICS7152M-02, ICS7152MI-02 40.0 MHz to 134.0 MHz
ICS7152M-11, ICS7152MI-11 16.6 MHz to 67.0 MHz
Center spread
ICS7152M-12, ICS7152MI-12 40.0 MHz to 134.0 MHz
PLL Clock
Synthesis
and Spread
Spectrum
Circuitry
SEL
FREQ
CKOUT
GND
VDD
Clock Buffer/
Crystal
Ocsillator
XIN
XOUT
External caps required with crystal for
accurate tuning of the clock
XENS