DATASHEET
EEPROM PROGRAMMABLE CLOCK GENERATOR IDT5V49EE904
IDT®
EEPROM PROGRAMMABLE CLOCK GENERATOR 1
IDT5V49EE904 REV Q 071015
Description
The IDT5V49EE904 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. Automatic or manual
switchover function allows any one of the redundant clocks
to be selected during normal operation.
The IDT5V49EE904 is in-system, programmable and can
be programmed through the use of I
2
C interface. An
internal EEPROM allows the user to save and restore the
configuration of the device without having to reprogram it on
power-up.
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.
There are a total of six 8-bit output dividers. 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.
Features
• Four internal PLLs
• Internal non-volatile EEPROM
• Fast (400kHz) mode I
2
C serial interface
• Input frequency range: 1 MHz to 200 MHz
• Output frequency range: 4.9 kHz to 200 MHz
• Reference crystal input with programmable linear load
capacitance
– Crystal frequency range: 8 MHz to 50 MHz
• Four independently controlled VDDO (1.8V - 3.3V)
• Each PLL has a 7-bit reference divider and a 12-bit
feedback-divider
• 8-bit output-divider blocks
• Fractional division capability on one PLL
• Two of the PLLs support spread spectrum generation
capability
• I/O Standards:
– Outputs - 1.8 - 3.3 V LVTTL/ LVCMOS
– Inputs - 3.3 V LVTTL/ LVCMOS
• Programmable slew rate control
• Programmable loop bandwidth
• Programmable output inversion to reduce bimodal jitter
• Redundant clock inputs with auto and manual switchover
options
• Individual output enable/disable
• Power-down mode
• 3.3V core V
DD
• Available in VFQFPN package
• -40 to +85 C Industrial Temp operation
