Cables used in an automotive environment

V3Link is a SerDes interface used for industrial applications. This link requires a reliable clock with well-controlled jitter. SiTime offers robust low-jitter clocks in small footprints that meet V3Link requirements with significant margin to support the reliable transfer of high-definition data over long distances and in harsh environments.

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SiTime MEMS Timing Benefits

Lower power and smaller size

Small form factor

Low power consumption

Accurate and robust

Excellent stability over temperature

Resilient to vibration 

Built to last

No quartz reliability issues

Higher quality 

V3Link requires a single-ended LVCMOS clock, provided by an oscillator such as the SiT8208. The clock frequency depends on various factors such as image resolution, frame rate, or V3Link clocking mode. Clock jitter must be well controlled. Excessive jitter on the clock "closes the eye diagram", resulting in increased bit error rate (BER) on the link.

Asynchronous V3Link clocking

Asynchronous mode represents the traditional way of driving serial data interfaces: both clock + data are provided at the input of the serializer. After transmission, both clock and data are recovered at the deserializer. Because multiple, independent links each run with its own independent clock, this mode is called asynchronous.

Asynchronous V3Link Block Diagram

Synchronous V3Link clocking

In synchronous mode, the clock is provided from an oscillator to the deserializer side of the V3Link. The clock is then transmitted "uplink" through the V3Link backchannel to the serializer. This mode is called synchronous because the link runs synchronously to the deserializer and multiple links are therefore synchronized.

Synchronous V3Link block diagram Block Diagram

Synchronizing multiple V3Link with a SiTime clock generator

When multiple cameras are synchronized, their frames are aligned. This reduces the need for a RAM buffer on the image signal processor side, otherwise needed to re-align mismatched video frames. Having all clocks at the same frequency and phase is a prerequisite for synchronizing multiple links.

Up to four cameras can be connected to a V3Link deserializer. When more cameras are needed in a system, a SiTime clock generator can be used to synchronize all clocks toward multiple deserializers. Clock generators can also provide other clocks in a system (such as PCI-Express, Ethernet, etc.), offering all advantages of integration.

MEMS Timing for EV Charging

Devices Key Features Key Values
MHz Oscillator
SiT8208A-G3-001  27 MHz
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SiT8208  1 to 80 MHz
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SiT1602  52 std freqs from 3.57 to 77.76 MHz
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  • -40°C to 85°C
  • ±20 ppm stability
  • Standard package sizes
  • Low jitter
  • High reliability
  • Flexible frequency options
  • Excellent stability over temperature
  • Featured on V3Link Reference Designs: TSER4905, TSER953, TSER954, TSER960
MHz Oscillator
SiT8021  1 to 26 MHz
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  • -40°C to 85°C
  • ±50 ppm stability
  • 1.5 x 0.8 CSP package
  • High reliability
  • Small footprint
MHz Oscillator
SiT1603 [2]  8 to 76.8 MHz (various specific frequencies)
  • -40°C to 85°C
  • ±25 ppm stability
  • 2 mA current consumption
  • 0.75 fs RMS phase jitter
  • 1612, 2016, 2520, 3225 packages
  • High reliability
  • Low power
  • Various standard package options
Clock Generator
SiT9121x family [2]  1 to 750 MHz
  • 4 and 8 output options
  • ±20 ppm stability
  • LVPECL, LVDS, HCSL, Low-power HCSL, FlexSwing™
  • < 200 fs RMS jitter [1]
  • Spread spectrum
  • -40°C to +105°C
  • 4x4, 5x5 and 6x6 mm packages
  • High reliability
  • Simplifies clock tree design with multiple low jitter clocks
  • Programmable clocks add flexibility to complex clocking architectures
  • Integrated solution generates all clocks for multiple V3Link as well as more clocks in the system: PCIExpress, Ethernet, SoC clocks, etc.
  • No external resonator needed
  • Small PCB footprint, compact layout

1 12 kHz to 20 MHz integration range

2 Please contact SiTime for availability

SiTime Timing Solutions Advantages

SiTime devices offer the following advantages over quartz crystals:

  • Up to 50x better reliability.
  • Up to 100x better resilience to shock, vibration and electromagnetic interference, due to the smaller size (0.4 x 0.4 mm) and lower mass of MEMS resonators compared to crystals.
  • EMI reduction features including drive strength selection and spread spectrum clocking (select devices).
  • Small footprint, enabled by the small size of the MEMS resonator.
  • Factory-programmed devices from standard parts enable short lead time and security of supply.
  • Reliable semiconductor supply chain.

MEMS Timing Outperforms Quartz

Better Quality, More Robust

Millions of Configurations

SiTime – Better Quality, More Robust
SiTime timing devices are up to 50x more reliable than legacy quartz
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