April 25, 2003- Dallas Semiconductor introduces 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 equalization to provide 43dB (E1 mode) and 36dB (T1 mode) sensitivity. It also allows user-defined receive-side termination for 75
, 100, or 120 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°C to +70°C) and industrial (-45°C to +85°C) temperature ranges. The LQFP is $19.95 (10k-up, FOB USA). Evaluation kits are also available.
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