ICS7152A
MDS 7152A A 1 Revision 102005
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
Spread Spectrum Clock Generator
Description
The ICS7152A-02 and -11 are clock generators for EMI
(Electromagnetic Interference) reduction (see below for
frequency ranges and multiplier ratios). Spectral peaks
are attenuated by modulating the system clock
frequency. Down or center spread profiles are
selectable. Down spread will not exceed the maximum
frequency of an unspread clock, and center spread
does not change the average operating frequency of
the system
ICS offers many other clocks for computers and
computer peripherals. Consult ICS when you need to
remove crystals and oscillators from your board.
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)
• Low cycle-to-cycle jitter - less than 100 ps
• Advanced, low-power CMOS process
• Industrial and commercial temperature ranges
• Available in Pb (lead) free package
• Pin compatible with Fujitsu MB88152-102 and -111
Block Diagram
Product Lineup
Product Input Frequency Range Modulation Type Modulation Enable Pin
ICS7152AM-02, ICS7152AMI-02 40.0 MHz to 134.0 MHz Down spread
Ye s
ICS7152AM-11, ICS7152AMI-11 16.6 MHz to 67.0 MHz Center spread
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