Description
The Lucent Technologies Microelectronics Group TTRN012G5 operates at the OC-48/STM-16 data rate of 2.5 Gbits/s. The TTRN012G7 device operates at either 2.5 Gbits/s or the RS FEC OC-48/STM-16 data rate of 2.7 Gbits/s. For clarity, this data sheet refers to the TTRN012G5 serial data rate as 2.5 Gbits/s and the parallel data and reference clock frequency as 155 MHz. (The precise rates are 2.48832 Gbits/s and 155.52 MHz.) When using the TTRN012G7 at the FEC rate, the 2.5 Gbits/s data rate should be interpreted as 2.7 Gbits/s and the parallel and clock frequency should be interpreted as 166 MHz. (The precise rates are 2.66606 Gbits/s and 166.62 MHz.)

Features
■ TTRN012G5 supports OC-48/STM-16 data rate
■ TTRN012G7 supports:
— OC-48/STM-16 data rate
— RS (255, 239) forward error correction (FEC) OC-48/STM-16 data rate
■ Fully integrated clock synthesizer and 16:1 data multiplexer
■ Supports clockless data transfer into the 16:1 multiplexer
■ Parity checking and valid data indication
■ Data inversion option
■ Additional high-speed CML serial data output for system loopback
■ Loss of lock indication
■ Single 3.3 V supply
■ Available in either MBIC 025 BiCMOS technology or lower-power MBIC 025 silicon germanium BiCMOS technology
■ LVPECL 155.52 Mbits/s digital I/O
■ Jitter generation and jitter transfer compliant with the following:
    — Telcordia Technologies* GR-253
    — ITU-T G.825
    — ITU-T G.958

Applications
■ SONET/SDH line origination equipment
■ SONET/SDH add/drop multiplexers
■ SONET/SDH cross connects
■ SONET/SDH test equipment
■ Digital video transmission