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