DATA SHEET
IDT8T49N366AASGI REVISION A JUNE 28, 2013 1 ©2013 Integrated Device Technology, Inc.
IDT8T49N366IFemtoClock
®
NG Triple Universal
Frequency Translator
TM
General Description
The IDT8T49N366I is a triple PLL with FemtoClock
®
NG technology.
The IDT8T49N366I integrates low phase noise Frequency
Translation / Synthesis and Jitter attenuation. It includes alarm and
monitoring functions suitable for networking and communications
applications. The device has three fully independent PLLs. Each PLL
is able to generate any output frequency in the 0.98MHz - 312.5MHz
range and most output frequencies in the 312.5MHz - 1,300MHz
range (see Table 3 for details). A wide range of input reference
clocks may be used as the source for the output frequency.
Each PLL of IDT8T49N366I has three operating modes to support a
very broad spectrum of applications:
1) Frequency Synthesizer
• Synthesizes output frequencies from an external reference
clock REFCLK.
• Fractional feedback division is used, so there are no
requirements for any specific input reference clock 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.
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 REFCLK to provide
significant jitter attenuation.
Each PLL provides factory-programmed default power-up
configuration burned into One-Time Programmable (OTP) memory.
The configuration is specified by customer and are programmed by
IDT during the final test phase from an on-hand stock of blank
devices.
To implement other configurations, these power-up default settings
can be overwritten after power-up using the I
2
C interface and the
device can be completely reconfigured.
Features
• Fourth generation FemtoClock
®
NG technology
• Three fully independent PLLs
• Universal Frequency Translator
TM
/Frequency Synthesizer and
Jitter attenuator
• Outputs are programmable as LVPECL or LVDS
• Programmable output frequency: 0.98MHz up to 1,300MHz
• Two differential inputs per PLL support the following input types:
LVPECL, LVDS, LVHSTL, HCSL
• Input frequency range: 8kHz - 710MHz (Low-Bandwidth mode)
• Input frequency range: 16MHz - 710MHz (High-Bandwidth mode)
• REFCLK frequency range: 16MHz - 40MHz
• Input clock monitor on each PLL will smoothly switch between
redundant input references
• Factory-set register configuration for power-up default state
• Power-up default configuration
• Configuration customized via One-Time Programmable ROM
• Settings may be overwritten after power-up via I
2
C
• I
2
C Serial interface for register programming
• RMS phase jitter at 161.1328125MHz, using 40MHz REFCLK
(12kHz - 20MHz): 465fs (typical), Low Bandwidth Mode (FracN)
• RMS phase jitter at 400MHz, using 40MHz REFCLK
(12kHz - 20MHz): 333fs (typical), Synthesizer Mode (Integer FB)
• Full 2.5V ±5% supply mode
• -40°C to 85°C ambient operating temperature
• 10mm x 10mm CABGA package
• Lead-free (RoHS 6) packaging
