DS3251N+

GENERAL
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.
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 DS3151/52/53/54 LIUs
• IEEE 1149.1 JTAG SupportAPPLICATIONS SONET/SDH and PDH Multiplexers Digital Cross-Connects Access Concentrators ATM and Frame Relay Equipment Routers PBXs DSLAMs CSU/DSUs