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Fujitsu Develops Spread-Spectrum Clock Generator

--Features World's Lowest EMI and Power Consumption Levels --

Fujitsu Limited

Tokyo, April 21, 2003

Fujitsu Limited today announced that, in cooperation with Fujitsu VLSI Limited, it has developed a new spread-spectrum clock generator (SSCG) system chip that achieves the world's lowest power requirement and electromagnetic interference (EMI) levels. The new design is being released as the MB88150 Series, with four models available in sample quantities starting today.

Spread-Spectrum Clock Generator

The new series uses digital control to generate the oscillator clock's modulation wave. By more accurately controlling clock frequency modulation, the new design enables a record 19 dB (1/80 power ratio) reduction in EMI noise. Moreover, adoption of CMOS process makes possible power consumption of just 18.2 mW (milliwatts)(*1), the lowest in the world.

This new low-noise design eliminates the need for the additional EMI noise-reduction components used in conventional clock generators. Reduced parts-count will help make possible lower costs and smaller sizes for photocopiers, printers, etc.

Pricing and availability

Product sample price sample ship date
MB88151 (frequency multiplier built in) ¥300 April 21, 2003
MB88152 (with pin for input frequency precision) ¥300 Late May, 2003
MB88153 (with power-down pin/external clock input) ¥300 Late June, 2003
MB88154 (with reference-clock output) ¥300 April 21, 2003

Sales targets: 4 million units/month (entire series)

Special Features

  1. Significant reduction in electromagnetic interference
    Digital PLL circuit technology permits extremely precise frequency modulation and reduces EMI by 19 dB (1/80 power ratio), the world's best noise reduction performance. This is about four times better than existing designs, and about twice as good in relation to voltage.
  2. Low power requirements
    A CMOS fabrication process results in a power draw of only 18.2 mW, one-fifth to one-half that of earlier designs.
  3. Low cycle-to-cycle jitter
    The new design has cycle-to-cycle jitter of less than 100 ps (picosecond) at 1x frequency multiplier, compared to 200-300 ps for earlier designs, making it suitable for use with high-speed ASICs and other advanced chips.

Main specifications of MB88150 Series

MB88151 MB88152 MB88153 MB88154
Power supply 3.3±0.3 V
Operating temp -20 to +85°C
Current (typ @24 MHz, no load) 5.0 mA 5.0 mA 4.5 mA 5.5 mA
Input freq (MHz) 16.6 to 33.4 20 to 134 20 to 134 20 to 67
Output freq (MHz) 8.3 to 33.4 20 to 134 20 to 134 20 to 67
Liquid-crystal oscillator (MHz) 16.6 to 33.4 20 to 40 - 20 to 40
Modulation (%) ±0.5, ±1.5; or -1.0, -3.0 selectable ±0.5, ±1.0, ±1.5; or -1.0, -2.0, -3.0 selectable
Modulation clock output amplitude 40-60%
Cycle-to-cycle jitter <100ps(@1x freq mult) <100ps
Frequency multipliers (times) 1/2, 1, 2, 4 - - -
Packaging Plastic 8-pin SSOP

  • [1] 18.2 mW

    Assuming a 3.3V power source, 24 MHz main frequency after spread, and no load

About Fujitsu

Fujitsu is a leading provider of customer-focused IT and communications solutions for the global marketplace. Pace-setting technologies, highly reliable computing and telecommunications platforms, and a worldwide corps of systems and services experts uniquely position Fujitsu to deliver comprehensive solutions that open up infinite possibilities for its customers' success. Headquartered in Tokyo, Fujitsu Limited (TSE:6702) reported consolidated revenues of 4.6 trillion yen (US$38 billion) for the fiscal year ended March 31, 2003.
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Press Contacts

Koyo Nishi, Nancy Ikehara
Public & Investor Relations

Phone: Phone: +81-3-3215-5259 (Tokyo)
Fax: +81-3-3216-9365
Company:Fujitsu Limited

Customer Contacts

Electronic Devices Group
System Micro Division

Phone: Phone: +81-42-532-1397
E-mail: E-mail:
Company:Fujitsu Limited

All company/product names mentioned may be trademarks or registered trademarks of their respective holders and are used for identification purpose only.

Please understand that product prices, specifications and other details are current on the day of issue of the press release, however, may change thereafter without notice.

Date: 21 April, 2003
City: Tokyo
Company: Fujitsu Limited, , , , ,