RENESAS 849N212CKI-008LF

The ICS849N212I is a highly flexible FemtoCloc NG general purpose, low phase noise Frequency Translator / Synthesizer with alarm and monitoring functions suitable for networking and communications applications. It is able to generate any output frequency in the 1MHz - 250MHz range. A wide range of input reference clocks and a range of low-cost fundamental mode crystal frequencies may be used as the source for the output frequency. The ICS849N212I has three operating modes to support a very broad spectrum of applications:

1. Frequency Synthesizer • Synthesizes output frequencies from a 16MHz - 40MHz fundamental mode crystal. • Fractional feedback division is used, so there are no requirements for any specific crystal frequency to produce the desired output frequency with a high degree of accuracy.
2. High-Bandwidth Frequency Translator • Applications: PCI Express, Computing, General Purpose • Translates any input clock in the 16MHz - 710MHz frequency range into any supported output frequency. • This mode has a high PLL loop bandwidth in order to track input reference changes, such as Spread-Spectrum Clock modulation, so it will not attenuate much jitter on the input reference.
3. Low-Bandwidth Frequency Translator • Applications: Networking & Communications. • Translates any input clock in the 8kHz - 710MHz frequency range into any supported output frequency. • This mode supports PLL loop bandwidths in the 10Hz - 580Hz range and makes use of an external crystal to provide significant jitter attenuation. This device provides two factory-programmed default power-up configurations burned into One-Time Programmable (OTP) memory. The configuration to be used is selected by the CONFIG pin. The two configurations are specified by the customer and are programmed by IDT during the final test phase from an on-hand stock of blank devices. The two configurations may be completely independent of one another. One usage example might be to install the device on a line card with two optional daughter cards: an OC-3 option (configuration 0) requiring a 155.52MHz LVDS clock translated from a 19.44MHz input and a Gigabit Ethernet option (configuration 1) requiring a 125MHz LVPECL clock translated from the same 19.44MHz input reference. To implement other configurations, these power-up default settings can be overwritten after power-up using the I2C interface and the device can be completely reconfigured. However, these settings would have to be re-written each time the device powers-up.

• Fourth generation FemtoClock NG technology
• Universal Frequency Translator/Frequency Synthesizer
• Two outputs
  • One programmable as LVPECL or LVDS
  • One LVCMOS
  • Both outputs may be set to use 2.5V or 3.3V output levels
• Programmable output frequency: 1.0MHz to 250MHz
• Two differential inputs support the following input types: LVPECL, LVDS, LVHSTL, HCSL
• Input frequency range: 8kHz - 710MHz
• Crystal input frequency range: 16MHz - 40MHz
• Two factory-set register configurations for power-up default state
  • Power-up default configuration pin or register selectable
  • Configurations customized via One-Time Programmable ROM
  • Settings may be overwritten after power-up via I2C
  • I2C Serial interface for register programming
• RMS phase jitter at 125MHz, using a 40MHz crystal (12kHz - 20MHz): 558fs (typical), Low Bandwidth Mode (FracN)
• RMS phase jitter at 125MHz, using a 100MHz input clock (12kHz - 20MHz): 388fs (typical), High Bandwidth Mode (Integer FB)
• Output supply voltage modes: VCC/VCCA/VCCO 3.3V/3.3V/3.3V 3.3V/3.3V/2.5V (LVPECL only) 2.5V/2.5V/2.5V
• -40°C to 85°C ambient operating temperature
• Available in lead-free (RoHS 6) package

• PCI Express
• Computing
• General Purpose
• Networking & Communications