78P2253

· 139.264Mbit/s or 155.52Mbit/s interface for CMI coded transmission using 75W 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

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 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.