Features: • Recovers a 155.52-MHz Clock Signal From a 155.52-Mbit/s STS-3/STM-1 NRZ Data Stream
• Accepts Pseudo-ECL (PECL) Input Voltage Levels on the Input Data Stream
• Provides a Separate Pseudo-ECL-to-True- ECL Converter for an Additional Data Signal Requiring Conversion
• Requires a Single 5-V SupplyPinout
SpecificationsSupply voltage range, VCC (see Note 1) . . . . . . . . . .. . . . . . . . 0.5 V to 7 V
Input voltage range, TTL . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 1.2 V to 7 V
Input voltage range, ECL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V to 0 V
Input voltage range, pseudo-ECL . . . . . . . . . . . . . . . . . . .. . . . . . 0 V to 7 V
Operating free-air temperature range, TA . . . . . . . . . . . . . . . 40°C to 85°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
† Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values are with respect to the GND terminals
DescriptionThe TNETA1555 device recovers an embedded clock signal from a 155.52-Mbit/s STS-3/STM-1 nonreturn-to-zero (NRZ) data stream using a frequency/phase-locked loop. The TNETA1555 device accepts PECL (ECL signals referenced to 5 V instead of GND) input-voltage levels. The recovered clock and data outputs are PECL compatible. The serial data input and recovered clock and data outputs are differential to provide maximum noise immunity.
The input disable (INDIS) disconnects the incoming serial data stream from the clock-recovery circuitry. When the INDIS input is high, the data output is forced low and the clock-recovery circuitry maintains the output frequency present at the time the input was disabled for a specific amount of time. This time is dependent upon the value of the capacitor in the loop filter. A PECL-to-ECL converter is included in the device for those applications where an interface between the two input voltage levels and a parallel-to-serial converter with pseudo-ECL-level outputs. The TNETA1555 requires only a positive 5-V supply (5 V ± 5 %) for operation. The device is characterized for operation over a temperature range of 40°C to 85°C.
TNETA1555 Data Sheet
