Line Interface Unit 256-Pin CSBGA

The DS26334 is a 16-channel short/long-haul line interface unit (LIU) that supports E1/T1/J1 from a single 3.3V power supply. A single bill of material can support E1/T1/J1 that requires no external termination. Redundancy is supported through nonintrusive monitoring, optimal high-impedance modes and configurable 1:1 or 1+1 backup enhancements. An on-chip synthesizer generates the E1/T1/J1 clock rates by a single master clock input of various frequencies. Two clock output references are also offered. The device is offered in a 256-pin TE-CSBGA, the smallest package available for a 16-channel LIU.

• 16 E1, T1, or J1 Short/Long-Haul Line Interface Units
• Independent E1, T1 or J1 Selections
• Fully Internal Impedance Match Requires No External Resistors
• Software-Selectable Transmit and Receive-Side Impedance Match
• Crystal-Less Jitter Attenuator
• Selectable Single-Rail and Dual-Rail Mode and AMI or HDB3/B8ZS Line Encoding and Decoding
• Detection and Generation of AIS
• Digital/Analog Loss of Signal Detection as per T1.231, G.775 and ETS 300 233
• External Master Clock Can Be Multiple of 2.048MHz or 1.544MHz for T1/J1 or E1 Operation; This Clock Will Be Internally Adapted for T1 or E1 Usage
• Receiver Signal Level Indicator from -2.5dB to -38dB in T1 Mode and -3dB to -43dB in E1 Mode in 2.5dB Increments
• Two Built-In BERT Testers for Diagnostics
• 8-Bit Parallel Interface Support for Intel or Motorola Mode or a 4-Wire Serial Interface
• Transmit Short-Circuit Protection
• G.772 Nonintrusive Monitoring
• Receive Monitor Mode Handles Combinations of 14dB to 30dB of Resistive Attenuation Along with 12dB to 30dB of Cable Attenuation
• Specification Compliance to the Latest T1 and E1 Standards-ANSI T1.102, AT&T Pub 62411, T1.231, T1.403, ITU-T G.703, G.742, G.775, G.823, ETS 300 166, and ETS 300 233
• Single 3.3V Supply with 5V Tolerant I/O
• JTAG Boundary Scan as Per IEEE 1149.1