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See Technical Specifications

813253BGLFT +BOM

FemtoClock® Jitter Attenuator & Multiplier Frequency Translator W/LVPECL Outputs

Manufacturer:

Renesas Electronics Corporation
Mfr.Part #:

813253BGLFT
Datasheet:

813253BGLFT Datasheet (PDF)
Series:

FemtoClock®
Programmabe:

Not Verified
Type:

Fanout Distribution, Frequency Translator, Jitter Attenuator, Voltage Controlled Crystal Oscillator (VCXO)
PLL:

Yes with Bypass
EDA/CAD Models:

Request Free CAD Models for 813253BGLFT

813253BGLFT General Description

The 813253 is a PLL based synchronous clock generator that is optimized for Gigabit Ethernet and PCI Express®™ clock jitter attenuation and frequency translation. The device contains two internal frequency multiplication stages that are cascaded in series. The first stage is a VCXO PLL that is optimized to provide reference clock jitter attenuation. The second stage is a FemtoClock® frequency multiplier that provides the low jitter, high frequency Gigabit Ethernet or PCI Express®™ output clock. Pre-divider and output divider multiplication ratios are selected using device selection control pins. The multiplication ratios are optimized to support most common clock rates used in Gigabit Ethernet and PCI Express® applications. The VCXO requires the use of an external, inexpensive pullable crystal. The VCXO uses external passive loop filter components which allows configuration of the PLL loop bandwidth and damping characteristics.

Key Features

Three differential LVPECL output pairs
One differential input supports the following input types: LVPECL, LVDS, LVHSTL, HCSL
Accepts input frequencies from 19.6MHz to 136MHz, including: 25MHz, 62.5MHz, 100MHz and 125MHz input clocks
Attenuates the phase jitter of the input clock by using a low-cost fundamental mode VCXO crystal
Outputs common Gigabit Ethernet or PCI Express® clock rates
VCXO PLL bandwidth can be optimized for jitter attenuation and reference tracking using external loop filter connection
Absolute pull range: ±50ppm
FemtoClock frequency multiplier provides low jitter, high frequency output
FemtoClock VCO range: 490MHz - 680MHz
RMS phase jitter @ 156.25MHz, using a 25MHz crystal (1.875MHz – 20MHz): 0.421ps (typical)
Full 3.3V supply, or mixed 3.3V core 2.5V output supply
0°C to 70°C ambient operating temperature
Available in lead-free (RoHS 6) package

Specifications

Series	FemtoClock®	Programmabe	Not Verified
Type	Fanout Distribution, Frequency Translator, Jitter Attenuator, Voltage Controlled Crystal Oscillator (VCXO)	PLL	Yes with Bypass
Input	HCSL, LVDS, LVHSTL, LVPECL, SSTL	Output	LVPECL
Number of Circuits	1	Ratio - Input:Output	2:3
Differential - Input:Output	Yes/Yes	Frequency - Max	156.25MHz
Divider/Multiplier	Yes/Yes	Voltage - Supply	2.375V ~ 3.465V
Operating Temperature	0°C ~ 70°C	Mounting Type	Surface Mount
Base Product Number	813253B