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Clock management ICs deliver low jitter, low skew

Phoenix, Ariz. — ON Semiconductor has expanded its ECLinPS clock management portfolio with the introduction of two clock distribution devices for synchronization of memory modules used in advanced computing, data storage, networking and consumer applications. The NB4N121K and NB4N111K feature differential Host Clock Signaling Level (HCSL) outputs and ultra-low propagation delay variation for fully buffered dual inline memory module (FBDIMM) applications.

The NB4N121K and NB4N111K are 3.3 volt (V) clock distribution devices targeted for typical FBDIMM frequencies of 100 MHz, 133 MHz, 166 MHz, 200 MHz, 266 MHz, 333 MHz and 400 MHz. Employing advanced 0.25-micron CMOS technology, the devices produce additive phase jitter of only 0.3 picoseconds (ps) and output-to-output skew of <100 ps, compared to competitive devices that typically perform at >1 ps jitter with skews well above 100 ps, according to ON Semiconductor. Clock inputs for both devices incorporate internal 50 ohm on die termination to reduce component count and simplify board layout.

The NB4N121K is a 1:21 or 1:42 HCSL clock distribution device. At 1:21, the device is said to provide the industry's widest fanout, and can be configured in 2x mode to provide a 1:42 HCSL fanout. The device accepts differential LVPECL, CML, or LVDS levels as well as single-ended LVPECL, CML, LVCMOS or LVTTL with the proper VREFAC supply. Output drive current at IREF (Pin 1) for 1x load is selected by connecting to GND. Configuring to 2x mode is accomplished by connecting IREF to VCC.

The NB4N111K is a 1:10 HCSL clock distribution device. It also accepts differential LVPECL, CML, or LVDS input levels as well as single-ended LVPECL, CML, LVCMOS, or LVTTL by properly setting the VREFAC supply.

Pricing: The NB4N121K (RoHS, 52-pin, exposed pad QFN) is priced at $4.00 in quantities of 1,000. The NB4N111K (RoHS, 32-pin, exposed pad QFN) is priced at $3.75 in quantities of 1,000.
Product information: NB4N11K and NB4N121K

ON Semiconductor , www.onsemi.com

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