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DS3251, DS3252, DS3253, DS3254
Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs
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Status
Active: In Production.
Description
The DS3251 (single), DS3252 (dual), DS3253
(triple), and DS3254 (quad) line interface units (LIUs)
perform the functions necessary for interfacing at the
physical layer to DS3, E3, or STS-1 lines. Each LIU
has independent receive and transmit paths and a
built-in jitter attenuator. An on-chip clock adapter
generates all line-rate clocks from a single input
clock. Control interface options include 8-bit parallel,
SPI, and hardware mode.
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Data Sheet
Errata DS3251 325XA2.pdfErrata DS3252 325XA2.pdfErrata DS3253 325XA2.pdfErrata DS3254 325XA2.pdfErrata DS3251 325XA3.pdfErrata DS3252 325XA3.pdfErrata DS3253 325XA3.pdfErrata DS3254 325XA3.pdf
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An evaluation kit is available: DS3254DK
Key Features
- Pin-Compatible Family of Products
- Each Port Independently Configurable
- Receive Clock and Data Recovery for up to 380 meters (DS3), 440 meters (E3), or
360 meters (STS-1) of 75Ω Coaxial Cable
- Standards-Compliant Transmit Waveshaping
- Three Control Interface Options: 8-Bit Parallel, SPI, and Hardware Mode
- Built-In Jitter Attenuators can be Placed in Either
the Receive or Transmit Paths
- Jitter Attenuators Have Provisionable Buffer Depth: 16, 32, 64, or 128 Bits
- Built-In Clock Adapter Generates All Line-Rate
Clocks from a Single Input Clock (DS3, E3, STS-1, OC-3, 19.44MHz, 38.88MHz,
77.76MHz)
- B3ZS/HDB3 Encoding and Decoding
- Minimal External Components Required
- Local and Remote Loopbacks
- Low-Power 3.3V Operation (5V Tolerant I/O)
- Industrial Temperature Range: -40°C to +85°C
- Small Package: 144-Pin, 13mm x 13mm Thermally Enhanced CSBGA
- Drop-In Replacement for DS3151/DS3152/DS3153/DS3154 LIUs
- IEEE 1149.1 JTAG Support
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Applications/Uses
- Access Concentrators
- ATM and Frame Relay Equipment
- CSUs/DSUs
- Digital Cross-Connects
- DSLAMs
- PBXs
- Routers/Switches
- SONET/SDH and PDH Multiplexers
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Diagram
Functional Diagram
More Information
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Information Index
Rev 2;
2006-03-02
This page last modified: 2009-10-06
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