Meet the industry’s smallest PCIe Gen 1/2/3 clock generator

Bigger definitely isn’t better when it comes to silicon. That’s why Silicon Labs is proud to announce the industry’s smallest PCIe Gen 1, 2 and 3 compliant clock generator, measuring only 2 mm X 2.5 mm, using our low-power PCIe and CMEMs technology.

The Si50122 does not need a reference crystal or clock input. The reference frequency source is integrated with the PCIe clock generator, using Silicon Labs’ CMEMS technology. The output buffers of the device utilizes low-power push-pull architecture to eliminate all external termination circuitry needed in traditional constant current mode architecture. This results in reduced BOM components and board space savings.

Let’s take a look under the hood (or inside the box) for more details.

Increases reliability by using CMEMS instead of quartz

Our CMEMS have a 10-year guaranteed operating life and frequency stability across an operating temperature range of -40°C to 85°C. Even under harsh conditions like wide temperature swings, shocks and extended vibration, the integrated CMEMS in Si50122 will provide reliable and guaranteed performance. It also eliminates common startup and reliability issues associated with quartz crystal.

Since there are no moving parts in CMEMS, the clock solution is very robust and not susceptible to drops. In handheld applications like digital cameras, the user no longer needs to worry about breaking the crystal if they drop the camera because the crystal has been replaced by CMEMS.

Simplify your design and your BOM

Utilizing push-pull output and CMEMS technologies allows for simplified trace routing. All you need to do is route clock signals from the output pins of Si50122 to a PCIe endpoint, instead of having to route signals from external crystal to the clock generator, and then to an endpoint.

The Si50122 comes in a small form-factor 10-pin TDFN package, saving precious board space in applications where PCB real estate is critical. Our low-power HCSL push-pull architecture does not require external termination resistors or reference current resistors. Most of our competitors’ devices use older constant current mode output buffer technology, requiring 4 external termination resistors per output, plus one reference current resistor.

Another advantage of utilizing our CMEMs technology together with low-power push-pull output buffers allows you to eliminate numerous external passive components, reducing component count to consolidate your BOM and reduce cost. Compared to a competitor’s 2-output constant-current PCIe clock generator, the Si50122 will reduce BOM component count by nine resistors, one 25MHz crystal, and 2 crystal loading capacitors. Take a look at the solutions to see the difference for yourself.

Go from multiple components taking up precious board space to the 2.5mmX2mm Si50122.

High performance, low power

Using push-pull technology also provides benefits in power consumption, while still meeting PCIe Gen1/2/3 maximum jitter requirements with margin. For example:

  • ICS557-03 Power consumption: 257.4 mW (IDD = 78 mA)
  • Si50122 Power consumption: 66 mW (IDD = 20 mA)

There’s no need to sacrifice space for performance when you choose the Si50122 crystal-less PCIe clock solution. To find out more about the Si50122, visit our product page.

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