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LSI integrates embedded FRAM, EMI protection

Posted: 03 Jun 2008 ?? ?Print Version ?Bookmark and Share

Keywords:FRAM LSI? EMI protection? ferroelectric RAM?

Fujitsu Microelectronics Ltd has expanded its product line of spread-spectrum clock generators (SSCG) with the MB88R157 that provides countermeasures against EMI on high-frequency clock signals.

The new LSI also includes embedded ferroelectric RAM, touted to be an industry first, which features fast rewriting speed and can vary its frequency output over a range of 1- to 134MHz while mounted on a circuit board. In addition, Fujitsu's circuit design technology reduces the product power consumption in continuous operation by up to 40 percent 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, mobile phones, TVs, DVD players and game consoles.

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 signal. 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 multifunctional, since the number of types of clock signals driving their internal circuits has increased, there is a need for SSCGs that do not only generate unique clock signals, but also vary those signals. In order to meet these needs, Fujitsu Microelectronics has integrated MB88R157 with embedded ferroelectric RAM.

The MB88R157 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 ferroelectric RAM. Having these parameters stored helps the customer change the parameters while the chip remains mounted on its circuit board.

In addition, 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 Ltd. This enables the device to achieve high levels of EMI mitigation, enabling the elimination of the capacitors, choke coils, or ferrite beads that are typically needed for noise reduction, thus further reducing a finished product's parts count.

Also, compared to similar products from other companies, Fujitsu claims the product reduces power consumption by up to 40 percent in continuous operation.

The new device encompasses patent-pending digital frequency modulation control technology and modulation cycle combination technology from Fujitsu VLSI, as well as Fujitsu's own ferroelectric RAM technology.

The MB88R157 is available for JPY 300 ($2.84)

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