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Low cost line interface unit

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DALLAS Semiconductor, represented by Arrow Electronics , has introduced the DS21448, a fully integrated, low cost, four channel, line interface unit (LIU).

Combining T1/J1 and E1 with long and short haul, the DS21448 offers the flexibility of designing a single board with universal functionality.

The DS21448 has state-of-the-art receiver and transmitter circuitry.

When configured for long haul, the receiver uses gain and equalisation to provide 43dB (E1 mode) and 36dB (T1 mode) sensitivity. It also allows user-defined receive-side termination for 75 ohms, 100 ohms, or 120 ohms for T1 or E1 operation.

The transmitter drives waveforms with excellent template compliance and includes line build-out control and a pattern generator.

The DS21448 also includes an AMI/HDB3/B8ZS generator/detector; 8-bit parallel, serial, and hardware data interfaces; and diagnostic capabilities such as loopbacks, PRBS pattern generator/detector, loss-of-signal indicator, and JTAG boundary scan architecture.

The DS21448 is a lower cost-per-port alternative and direct replacement for the 3.3V DS21Q348. It is available in 144-pin BGA and 128-pin LQFP packages in commercial (0°Celsius to +70°Celsius) and industrial (-45°C to +85°C) temperature ranges. Evaluation kits are also available.

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