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78P2253 Datasheet

  • 78P2253

  • E4/STM-1/STS-3/OC-3 Transceiver

  • 23頁

  • ETC

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78P2253
E4/STM-1/STS-3/OC-3
Transceiver
Advanced Information
November 2000
DESCRIPTION
The 78P2253 is a transceiver IC designed for
139.264Mbit/s (E4) or 155.52Mbit/s (OC-3, STS-3 or
STM-1) transmission. It is used at the interface to a
75鈩?coaxial cable using CMI coding or a fiber optic
module. Interface to digital framer circuits is
accomplished via a serial PECL or parallel CMOS
interface.
The transmitter includes a PLL to multiply the
reference clock to the transmission frequency. The
receiver provides adaptive equalization for accurate
clock and data recovery. The 78P2253 is built in a
BiCMOS technology for high performance and low
power operation. It operates with a 3.3V or 5V power
supply and is packaged in a 64-pin TQFP.
FEATURES
鈥?/div>
139.264Mbit/s or 155.52Mbit/s interface for
CMI coded transmission using 75鈩?coaxial
cable
Compliant with ITU-T G.703, G.823 jitter
tolerance, Telcordia TR-NWT-00253
Integrated Clock Recovery Unit (CRU)
Serial PECL Interface
Four and Eight bit Parallel CMOS Interfaces
PECL Interfaces for connection to Fiber
Optic Modules for SONET OC3 applications
Adaptive Equalization
Integrated Clock Multiplier PLL
Advanced BiCMOS Process
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
BLOCK DIAGRAM
HUB/HOST
PAR/SER
E4/SONET
8BIT/$BIT
CM I/ECL
XTAL1
XTAL2
CKIN
Crystal
Oscillator
Clock
Generator
Binary
to CMI
CMIOUTP
CMIOUTN
TXCK
TXCKP,N
RLBACK
TXDTP,N
TXDT[7:0]
ECLOUTP
ECLOUTN
ECLINP
ECLINN
RXDTP,N
RXDT[7:0]
RXCKP,N
RXCK
CMI to
Binary
Clock
Recovery
Adaptive
Equalizer
CMIINP
CMIINN
Bias
Signal
Detector
RFO
LLBACK
LOS
LF

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