Single Output Clock Generator
IDT5V926A
DATA SHEET
FEATURES:
DESCRIPTION:
• 3V to 3.6V operating voltage
The IDT5V926A is a low-cost, low skew, low jitter, and
high-performance clock multiplier with a reference clock
from either a lower frequency crystal or clock input. It has
been specially designed to interface with Gigabit Ethernet
and Fast Ethernet applications by providing a 125MHz
clock from 25MHz input. It can be programmed to provide
output frequencies ranging from 48MHz to 160MHz, with
input frequencies ranging from 6MHz to 80MHz.
• 48MHz to 160MHz output frequency range
• Input from fundamental crystal oscillator or external
source
• Internal PLL feedback (loading the feedback output
relative to the other outputs, will adjust the propagation
delay between REF inputs and outputs)
• Select inputs (S[1:0]) for FB divide selection (multiply
ratio of 2, 3, 4, 4.25, 5, 6, 6.25, and 8)
• Low jitter
The IDT5V926A includes an internal RC filter that pro-
vides excellent jitter characteristics and eliminates the
need for external components. When using the optional
crystal input, the device accepts a 10 - 40MHz fundamental
mode crystal with a maximum equivalent series resistance
of 50Ω.
• PLL bypass for testing and power-down control
(S1 = H, S0 = H, powers part down <500µA)
• Available in TSSOP package
• Pin and function compatible to IDT5V926
APPLICATIONS:
• Gigabit ethernet
• Router
• Network switches
• SAN
• Instrumentation
• Fibre channel
FUNCTIONAL BLOCK DIAGRAM
OE
VCO DIVIDE
1/N
PHASE
DETECTOR
CHARGE
PUMP
LOOP
FILTER
VCO
QOUT
0
1
X1/REF
CRYSTAL
OSCILLATOR
QREF
X2
SELECT MODE
S1 S0
REFE
IDT5V926A REVISION A JUNE 11, 2009
1
©2009 Integrated Device Technology, Inc.
