GENERAL DESCRIPTION
The 813001I is a dual VCXO + FemtoClock™ Multiplier designed for use in Discrete PLL loops. Two selectable external
VCXO crystals allow the device to be used in multi-rate applications, where a given line card can be switched, for example,
between 1Gb Ethernet (125MHz system reference clock) and
1Gb Fibre Channel (106.25MHz system reference clock) modes.
Of course, a multitude of other applications are also possible
such as switching between 74.25MHz and 74.175824MHz for
HDTV, switching between SONET, FEC and non FEC rates, etc.
The 813001I is a two stage device – a VCXO followed
by a FemtoClock PLL. The FemtoClock PLL can multiply
the crystal frequency of the VCXO to provide an output
frequency range of 40.83MHz to 640MHz, with a random rms
phase jitter of less than 1ps (12kHz – 20MHz). This phase jitter
performance meets the requirements of 1Gb/10Gb Ethernet,
1Gb, 2Gb, 4Gb and 10Gb Fibre Channel, and SONET up to
OC48. The FemtoClock PLL can also be bypassed if frequency multiplication is not required. For testing/debug purposes,
de-assertion of the output enable pin will place both Q and nQ
in a high impedance state.

FEATURES
• One 3.3V or 2.5V LVPECL output pair
• Two selectable crystal oscillator interfaces for the VCXO,
one differential clock or one LVCMOS/LVTTL clock inputs
• CLK1/nCLK1 supports the following input types:
LVPECL, LVDS, LVHSTL, SSTL, HCSL
• Crystal operating frequency range: 14MHz - 24MHz
• VCO range: 490MHz - 640MHz
• Output frequency range: 40.83MHz - 640MHz
• VCXO pull range: ±100ppm (typical)
• Supports the following applications (among others):
SONET, Ethernet, Fibre Channel, HDTV, MPEG
• RMS phase jitter @ 622.08MHz (12kHz - 20MHz):
0.84 (typical)
• Supply voltage modes:
VCC/VCCO
3.3V/3.3V
3.3V/2.5V
2.5V/2.5V
• -40°C to 85°C ambient operating temperature
• Available in RoHS/Lead-Free compliant package