The TQ8105/TQ8106 are SONET/SDH transceivers that integrate multiplexing, demultiplexing, SONET/SDH framing, clock-synthesis PLL, and enhanced line and clock diagnostic functions into a single monolithic device. The TQ8106 is a pin-compatible upgrade of the TQ8105 that includes a Clock and Data Recovery (CDR) function. The TQ8105 and TQ8106 allow maximum flexibility in the selection of internal/external Clock and Data Recovery, Opto-Electronic (O/E) Module, and Reference Clock Sources.

Features
• Single-chip, byte-wide Mux, Demux, Framer, and Tx clocksynthesis PLL with enhanced diagnostics
• TQ8106 includes monolithic Clock and Data Recovery
• SONET/SDH/ATM compliant for STS-12/STM-4 (622 Mb/s) or STS-3/STM-1 (155 Mb/s) rates
• 155.52, 77.76, 51.84, 38.88, or 19.44 MHz reference clock inputs with TTL, PECL, or ECL level
• 38.88 MHz and 51.84 MHz clock outputs for UTOPIA as well as byte clock rate (77.76 or 19.44 MHz)
• External RC-based loop filters
• Integrated loopbacks with enhanced line and reference clock diagnostics
• Direct-coupled standard, PECL, high-speed I/O with ECL option
• Clean TTL interface to PMC-Sierra devices
• 100-pin 14x14 mm JEDEC plastic package
• +5V-only supply for PECL I/O (–5.2V required for ECL I/O option)
• –40 to +125°C case operating temperature