True drop-in solution to EMI problems: News from Alliance Semiconductor Corp

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Alliance Semiconductor Corp reckons it has developed the industry's first zero cycle slip EMI reduction device. Clock distribution is a key element of system design. Ever increasing bus speeds and bus widths in high performance systems has made this task of timing management a huge challenge.

The demand for fast edge rates to meet timing budget constraints has made the EMI challenge even more difficult.

This product is the merger of two widely used technologies of zero delay clocking and spread spectrum clock modulation for EMI reduction.

This new family of devices provides an EMI reduction device that can be directly dropped in the path of an offending clock and still maintain the same phase and timing relationship with the synchronised data.

This allows a true drop-in solution to EMI problems caused by clocks.

In its initial offering Alliance has introduced the ASM3P62300A/B/C available in an 8-pin package and providing a single EMI compliant phase aligned output and the ASM3P62300D/E available in 16-pin packages and providing four phase aligned EMI compliant outputs with pin to pin skews guaranteed to be less than 250ps.

In addition, the 16-pin versions offer a delay control pin that can vary the input to output delay using a capacitive load.

This can be used to achieve zero input-to-output phase shifts.

These products target frequencies from 15 to 50MHz and offer selectable fractional cycle slip and deviation.

These devices are crucial in applications like datacommunications and telecomms, as well as industrial and consumer applications where clock-data alignment needs to be maintained (LAN, USB etc).

Follow-on products will extend the frequency and voltage range.

Alliance offers commercial and industrial temperature grades, with standard tin-lead or full RoHS-compliant products.

According to Narendar Venugopal, General Manager of Alliance's Mixed-Signal Business Unit: 'With this new product introduction Alliance Semiconductor continues to demonstrate its ability to provide innovative solutions that meet the challenges of EMI compliance in an expanding consumer market'.

Samples are available today, with initial pricing set at $1.50 in 1000-unit quantities.

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