Power Electronics

High Performance Clock Distribution Solutions

Two new clock distribution ICs are available from ON Semiconductor. The NB6L56 presents the industry with a more advanced 2:1 signal management solution. It is pin-to-pin compatible with existing products on the market, but offers greatly enhanced jitter performance, allowing a wider eye opening so that system reliability can be improved. It handles clocks speeds of up to 2.5 GHz and data streams of up to 2.5 Gbps with very low power consumption. This is complemented by the NB3F8L3010C, which provides a combination of cost-effectiveness, flexibility and performance that make it highly suited to communication infrastructure applications.

Operating from a supply voltage of 2.5V and 3.3V, the high performance NB6L56 2:1 clock/data multiplexer's differential inputs incorporate internal 50 Ω termination resistors accessed through the VT pin. This feature allows the device to accept a broad variety of logic level standards, including low voltage positive emitter coupled logic (LVPECL), current mode logic (CML) and low voltage differential signaling (LVDS). Outputs are 800 millivolts (mV) emitter coupled logic (ECL) signals. The additive clock and data jitter produced is minimal even when operating at 2.5 GHz and 2.5 Gbps rates, respectively. This makes the NB6L56 highly optimized for use in SONET, Gigabit Ethernet and Fiber Channel network infrastructure, as well as other telecom and data communication applications.

The NB3F8L3010C is a 3:1 multiplexer and a 1:10 clock/data fanout buffer targeted at networking and communications applications. Operating from a 3.3 V or 2.5 V core supply, the device has differential inputs which accept LVPECL, LVDS, host clock signal level (HCSL) and SSTL signals. It has a total of 10 single-ended LVCMOS outputs each capable of running at 200 megahertz (MHz). Output skew is typically kept to just 10 ps. Both the NB3F8L3010C and NB6L56 devices support an industrial temperature range of -40 °C to 85 °C.

Both the NB6L56 and the NB3F8L3010C are supplied in a low profile 5 mm x 5 mm 32-pin QFN package. They are priced at $4.92 and $4.41, respectively for 1K unit quantities.

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