DATASHEET
EEPROM PROGRAMMABLE CLOCK GENERATOR
IDT5V49EE901
Description
Features
The IDT5V49EE901 is a programmable clock generator
intended for high performance data-communications,
telecommunications, consumer, and networking
applications. There are four internal PLLs, each individually
programmable, allowing for four unique non-integer-related
frequencies. The frequencies are generated from a single
reference clock. The reference clock can come from one of
the two redundant clock inputs. A glitchless automatic or
manual switchover function allows any one of the redundant
clocks to be selected during normal operation.
• Four internal PLLs
• Internal non-volatile EEPROM
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• Fast (400kHz) mode I C serial interface
• Input frequency range: 1 MHz to 200 MHz
• Output frequency range: 4.9 kHz to 500 MHz
• Reference crystal input with programmable linear load
capacitance
– Crystal frequency range: 8 MHz to 50 MHz
The IDT5V49EE901 is in-system, programmable and can
be programmed through the use of I C interface. An
• Each PLL has a 7-bit reference divider and a 12-bit
feedback-divider
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internal EEPROM allows the user to save and restore the
configuration of the device without having to reprogram it on
power-up.
• 8-bit output-divider blocks
• Fractional division capability on one PLL
• Two of the PLLs support spread spectrum generation
Each of the four PLLs has an 7-bit reference divider and a
12-bit feedback divider. This allows the user to generate
four unique non-integer-related frequencies. The PLL loop
bandwidth is programmable to allow the user to tailor the
PLL response to the application. For instance, the user can
tune the PLL parameters to minimize jitter generation or to
maximize jitter attenuation. Spread spectrum generation
and/or fractional divides are allowed on two of the PLLs.
capability
• I/O Standards:
– Outputs - 3.3 V LVTTL/ LVCMOS
– Outputs - LVPECL, LVDS and HCSL
– Inputs - 3.3 V LVTTL/ LVCMOS
• Programmable slew rate control
• Programmable loop bandwidth
• Programmable output inversion to reduce bimodal jitter
There are a total of six 8-bit output dividers. Each output
bank can be configured to support LVTTL, LVPECL, LVDS
or HCSL logic levels. Out0 (Output 0) supports 3.3V
single-ended output only. The outputs are connected to the
PLLs via a switch matrix. The switch matrix allows the user
to route the PLL outputs to any output bank. This feature
can be used to simplify and optimize the board layout. In
addition, each output's slew rate and enable/disable
function is programmable.
• Redundant clock inputs with glitchless auto and manual
switchover options
• Individual output enable/disable
• Power-down mode
• 3.3V core V
DD
• Available in TSSOP and VFQFPN packages
• -40 to +85 C Industrial Temp operation
IDT® EEPROM PROGRAMMABLE CLOCK GENERATOR
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IDT5V49EE901
REV J 022310