SI5320 Datasheet, PDF (1/34 Pages) List of Unclassifed Manufacturers – SONET/SDH PRECISION CLOCK MULTIPLIER IC

Si5320
SONET/SDH PRECISION CLOCK MULTIPLIER IC
Features
„ Ultra-low-jitter clock output with
jitter generation as low as
0.3 ps_RMS
„ No external components
(other than a resistor and
standard bypassing)
„ Input clock ranges at 19, 39, 78,
155, 311, and 622 MHz
„ Output clock ranges at 19, 155,
or 622 MHz
„ Digital hold for loss of input clock
„ Support for forward and reverse
FEC clock scaling
„ Selectable loop bandwidth
„ Loss-of-signal alarm output
„ Low power
„ Small size (9x9 mm)
Applications
„ SONET/SDH line/port cards
„ Optical modules
„ Core switches
„ Digital cross connects
„ Terabit routers
Description
The Si5320 is a precision clock multiplier designed to exceed the requirements of
high-speed communication systems, including OC-192/OC-48 and 10 GbE. This
device phase locks to an input clock in the 19, 39, 78, 155, 311, or 622 MHz
frequency range and generates a frequency-multiplied clock output that can be
configured for operation in the 19, 155, or 622 MHz range. Silicon Laboratories’
DSPLL^™ technology delivers all PLL functionality with unparalleled performance
while eliminating external loop filter components, providing programmable loop
parameters, and simplifying design. FEC rates are supported with selectable 255/
238 or 238/255 scaling of the clock multiplication ratios. The Si5320 establishes a
new standard in performance and integration for ultra-low-jitter clock generation. It
operates from a single 3.3 V supply.
Functional Block Diagram
REXT
VSEL33
VDD
GND
FXDDELAY
CLKIN+
CLKIN–
VALTIME
LOS
Biasing & Supply Regulation
2
÷
Signal
Detect
3
DSPLL^TM
2
2
÷
2
Calibration
CAL_ACTV
DH_ACTV
CLKOUT+
CLKOUT–
FRQSEL[1:0]
RSTN/CAL
INFRQSEL[2:0] ^{FEC[1:0] DBLBW BWSEL[1:0]}
Si5320
Si5320
Ordering Information:
See page 29.
Rev. 2.3 4/05
Copyright © 2005 by Silicon Laboratories
Si5320