Fujitsu Launches Industry's First Embedded FRAM-LSI that Counteracts Electromagnetic Interference

Fujitsu Launches Industry's First Embedded FRAM-LSI that Counteracts Electromagnetic Interference
Fujitsu Microelectronics Limited
Fujitsu Launches Industry's First Embedded FRAM-LSI
that Counteracts Electromagnetic Interference
-Can meticulously handle arbitrary clock frequencies of up to 134 MHz-
Tokyo, May 22, 2008 - Fujitsu Microelectronics Limited (FML) today announced the
launch of the MB88R157, an addition to its existing product line of spread-spectrum
clock generators (SSCG(1)), which provide countermeasures against electromagnetic
interference (EMI(2)) on high-frequency clock signals. The new LSI also includes
embedded FRAM(3), an industry first, which features fast rewriting speed and can vary
its frequency output over a range of 1 MHz to 134 MHz while mounted on a circuit board.
In addition, Fujitsu Microelectronics' circuit design technology reduces the product
power consumption in continuous operation by up to 40% in comparison to similar
products from other companies. As it is easy to rewrite parameters in this new LSI, it is
appropriate for a wide range of applications including multi-functional printers, PCs, and
mobile phones, as well as for televisions, DVD players, and game consoles.
Figure 1: SSCG Product Roadmap
In order to avoid the adverse effects of EMI on high-frequency clock signals, which can
cause malfunctions of the chip or the entire system, this LSI minutely varies its clock
Fujitsu has offered SSCGs since 2003, and each SSCG has a unique clock frequency
depending on the application in which it would be used.
As digital-media devices have become more high-performance and multi-functional,
since the number of types of clock signals driving their internal circuits has increased,
Press Contacts
Fujitsu Semiconductor Limited
Inquiries :
there is a need for SSCGs that can not only generate unique clock signals, but also vary
those signals. In order to meet these needs, Fujitsu Microelectronics developed the
MB88R157 with embedded FRAM.
This new product encompasses patent-pending digital frequency modulation control
technology and modulation cycle combination technology from Fujitsu VLSI Limited, as
well as Fujitsu Microelectronics' own FRAM technology. Fujitsu Microelectronics will
continue to provide high value-added SSCG products in future.
Sample Price and Availability
Product Name Sample Price Sample Shipment
JPY 300
From May 22, 2008
Sales Target
1.6 million units/month
Product Features
1. Built-in FRAM for precise clock-frequency settings
This product allows the customer to vary the clock rate, adjust the modulation rate,
decide whether to use modulation at all, and set stable oscillation capacitance values for
stable frequency output. These parameters can be stored in the built-in FRAM. Having
these parameters stored in the onboard FRAM means that the customer can change the
parameters while the chip remains mounted on its circuit board. Compared to the
E2PROM embedded on many products on the market, FRAM's high rewrite speed with
lower power consumptions helps customers improve their own production line efficiency.
2. Reduction of parts count enabled through embedding of peripheral accessories
The new LSI features an embedded stable oscillator capacitor required for stable
frequency output. It also includes patent-pending digital frequency modulation control
technology and modulation cycle combination technology, both technologies from Fujitsu
VLSI Limited, to achieve the world's highest levels of EMI mitigation, thereby enabling
the elimination of the capacitors(4), choke coils (5), or ferrite beads (6) that are typically
needed for noise reduction, and thus further reducing a finished product's parts count.
3. Low power consumption operation
Compared to similar products from other companies, this product reduces power
consumption by up to 40% in continuous operation.
1 Spread-spectrum clock generator (SSCG):
A type of clock circuit that can minutely vary (modulate) its clock frequency, thereby
reducing the spectrum power of that frequency. This is a technique adopted in recent
years as a countermeasure against electromagnetic interference (EMI) in devices such
as PCs and printers.
2 Electromagnetic interference (EMI) :
Electromagnetic noise emitted by electronic devices. As strong EMI can adversely affect
nearby devices, causing them to malfunction, various nations have set upper limits for
acceptable EMI levels.
Ferroelectric random access memory. A type of non-volatile memory that uses a
ferroelectric film as a data-storage capacitor. Combines the benefits of ROM and RAM
with fast data writes, low power consumption operation, support for numerous rewrites,
and data retention without power consumption. Also known as FeRAM.
4 Capacitors:
An electronic device consisting of two electrified plates separated by a dielectric.
Typically used in systems to stabilize signal variations.
5 Choke coils:
A component for noise countermeasure. Consists of wire wound around a magnet. Used
to prevent currents with frequency components above a certain level used in systems.
6 Ferrite beads :
A component for noise countermeasure. Uses ferrite's material properties to convert
noise to heat.
Press Contact:
Public and Investor Relations
Fujitsu Limited
For more information
Fujitsu Microelectronics Limited
Fujitsu - Spread Spectrum Clock Generator: SSCG
About Fujitsu Microelectronics (FML)
Fujitsu Microelectronics Limited designs and manufactures semiconductors, providing highly
reliable, optimal solutions and support to meet the varying needs of its customers. Products and
services include ASICs/COT, ASSPs, power management ICs, and flash microcontrollers, with
wide-ranging expertise focusing on imaging, wireless, automotive and security applications.
Fujitsu Microelectronics also drives power efficiency and environmental initiatives.
Headquartered in Tokyo, Fujitsu Microelectronics Limited was established as a subsidiary of
Fujitsu Limited on March 21, 2008. Through its global sales and development network, with sites
in Japan and throughout Asia, Europe, and the Americas, Fujitsu Microelectronics offers
All company or product names mentioned herein are trademarks or registered trademarks of
their respective owners. Information provided in this press release is accurate at time of issue
and is subject to change without advance notice.
MB88R157 Key Specifications
Input clock frequency
Output clock frequency
Modulation rate
Other functions
Power-supply voltage
Operating temperature
10 MHz to 50 MHz
1 MHz to 134 MHz (also accommodates
fractional frequencies)
No modulation
±0.25% to ±1.75%, varied in ±0.25% steps
Output-enabled function (**1)
3.0 V to 3.6 V
-20°C to +85°C
SOP (**2)
8-pin, 1.27 mm pitch, 3.9 x 5.05 mm
**1: Output enabled: Changes clock-output pin level during system standby
**2: SOP: small-outline L-lead package; a type of compact chip packaging
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