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• Low-power (3.3V and 2.5V) operation
(power dissipation approximately 750 mW at 2.5V)
• No external references
• Programmable for operation up to 3.2 Gbps
• SmartCenter™ CDR architecture, jitter tolerance
> 0.7 UI
• 196-pin BGA
network access products
2.5 Gbps Quad Clock
and Data Recovery
CX20464
The CX20464 is used to retime signals in large switch
matrices. CDRs are critical elements in the SONET/SDH
telecom transmission system, providing internal retiming
of high-speed signals. Conexant’s quad OC-48 CDR is one of
very few commercially available quad 3.2 Gbps retimers, and
can be used with the CX20462 and the CX20472 crosspoint
switches. It enables the development of high-density switch
cores, while substantially reducing the number of ICs on a
single board. This also reduces power dissipation, a critical
objective of today’s telecom system designers.
Distinguishing Features
PRE/
LOS
LoopFil
VCO
MUX
FD
PD
Dinp/n[3]
LOS[3]
LOL[3]
Doutp/n[3]
Coutp/n[3]
LPPp/n/f[3]
Tclkp/n[3]
EXTRes[3]
PRE/
LOS
LoopFil
VCO
MUX
FD
PD
Dinp/n[2]
LOS[2]
LOL[2]
Doutp/n[2]
Coutp/n[2]
LPPp/n/f[2]
Tclkp/n[2]
EXTRes[2]
PRE/
LOS
LoopFil
VCO
MUX
FD
PD
Dinp/n[1]
LOS[1]
LOL[1]
Doutp/n[1]
Coutp/n[1]
LPPp/n/f[1]
Tclkp/n[1]
EXTRes[1]
PRE/
LOS
LoopFil
VCO
MUX
FD
PD
Dinp/n[0]
LOS[0]
LOL[0]
Doutp/n[0]
Coutp/n[0]
LPPp/n/f[0]
Tclkp/n[0]
EXTRes[0]
SDO
FTEST[0:3,a:d] TEST[0:3,a:c]
SDI
SCLK
xCS
xRST
xENCLK
Serial Interface
and Registers
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