STS-12/STS-3 Multirate Clock and Data Recovery Unit
Data Sheets OBS (Obsolete)


Line Interface OC-12/3 STM-4/1
Protocols SONET/SDH
Trans Interface LVDS
Pwr Sup 3.3V
Package TSSOP-20
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The XRT91L33 is a fully integrated multirate Clock and Data Recovery (CDR) device for SONET/SDH 622.08 Mbps STS-12/STM-4 or 155.52 Mbps STS-3/STM-1 applications. The device provides Clock and Data Recovery (CDR) function by synchronizing its on-chip Voltage Controlled Oscillator (VCO) to the incoming serial scrambled non-return to zero (NRZ) data stream.

  • Performs clock and data recovery for selectable data of 622.08 Mbps (STS-12/STM-4) or 155.52 Mbps (STS-3/STM-1) NRZ data
  • Meets Telcordia, ANSI and ITU-T G.783 and G.825 SDH jitter requirements including T1.105.03 - 2002 SONET Jitter Tolerance specification, and GR-253 CORE, GR-253 ILR SONET Jitter specifications
  • Lock output pin monitors data run length and frequency drift from reference clock
  • Data is resampled at the output
  • Active High Signal Detect (SIGD) LVPECL input
  • Low jitter, high-speed outputs support LVPECL and low-power LVDS termination
  • 19.44 MHz reference frequency LVTTL input
  • Low power: 215 mW typical
  • 3.3V power supply
  • 20-pin TSSOP package
  • Requires one external capacitor
  • PLL bypass operation facilitates board debug process
  • ESD greater than 2kV on all pins
  • Pb-Free, RoHS Compliant Versions Offered

  • SONET/SDH-based Transmission Systems
  • Add/Drop Multiplexers
  • Cross Connect Equipment
  • ATM and Multi-Service Switches, Routers and Switch/Routers
  • SONET/SDH Test Equipment
  • DWDM Termination Equipment

Documentation & Design Tools

Type Title Version Date File Size
Data Sheets XRT91L33 STS-12/STS-3 MultiRate Clock and DATA RECOVERY UNIT 1.0.0 August 2008 336 KB
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Quality & RoHS

Part Number RoHS | Exempt RoHS Halogen Free REACH TSCA MSL Rating / Peak Reflow Package
XRT91L33IG-F N Y Y Y Y L1 / 260ᵒC TSSOP20
XRT91L33IGTR-F N Y Y Y Y L1 / 260ᵒC TSSOP20

Click on the links above to download the Certificate of Non-Use of Hazardous Substances.

Additional Quality Documentation may be available, please Contact Support.

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Suggested Replacement PDN
XRT91L33IG-F TSSOP20 -40 85 OBS
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Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.


Pkg Code Details Quantities Dimensions PDF
  • JEDEC Reference: MO-153
  • MSL Pb-Free: L1 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 110.7ºC/W
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: 74
  • Quantity per Reel: 2500
  • Quantity per Tube: 74
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 16 x 8
  • Tape & Reel Unit Orientation: Quadrant 1
  • Dimensions: mm
  • Length: 6.5
  • Width: 4.4
  • Thickness: 1.2
  • Lead Pitch: 0.65


Distribution Date Description File
02/03/2022 Product Discontinuation Notice
07/12/2017 Product Discontinuation Notice
05/10/2017 Qualification of alternate assembly subcon, JCET.
02/23/2017 Qualification of alternate assembly subcon, ANST, China.
02/15/2017 Qualification of alternate assembly subcon, ANST.
06/26/2009 Elimination of the back (bottom) mark and addition of the lot number to the top mark. To eliminate duplication and to reduce assembly cycle times.

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The -F suffix indicates ROHS / Green compliance: