78P2253-IGT Просмотр технического описания (PDF) - TDK Corporation

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78P2253-IGT

E4/STM-1/STS-3/OC-3 Transceiver

TDK Corporation 

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

75Ω 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.

BLOCK DIAGRAM

78P2253

E4/STM-1/STS-3/OC-3

Transceiver

Advanced Information

FEATURES

November 2000

• 139.264Mbit/s or 155.52Mbit/s interface for

CMI coded transmission using 75Ω 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

CKIN

TXCK

TXCKP,N

RLBACK

TXDTP,N

TXDT[7:0]

RXDTP,N

RXDT[7:0]

RXCKP,N

RXCK

Crystal

Oscillator

Clock

Generator

Binary

to CMI

CMI to

Binary

Bias

Clock

Recovery

Adaptive

Equalizer

Signal

Detector

CMIOUTP

CMIOUTN

ECLOUTP

ECLOUTN

ECLINP

ECLINN

CMIINP

CMIINN

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