The DS26303 is an 8-channel short-haul line interface unit (LIU) that supports E1/T1/J1 from a single 3.3V power supply. A wide variety of applications are supported through internal termination or external termination. A single bill of material can support E1/T1/J1 with minimum external components. 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 DS26303 is a single‑chip, 8‑channel short‑haul line interface unit (LIU) that operates from a single 3.3 V supply and supports E1, T1 and J1 interfaces. It offers internal or external termination, selectable impedance (75 Ω, 100 Ω, 110 Ω, 120 Ω), and redundancy options such as non‑intrusive monitoring and configurable 1:1 or 1+1 backup.
The device includes an on‑chip synthesizer for clock generation, a 128‑bit crystal‑less jitter attenuator, built‑in BERT tester, and JTAG boundary‑scan for diagnostics. It can be accessed via an 8‑bit parallel interface (Intel or Motorola mode) or a 4‑wire serial port, and is supplied in a 144‑pin eLQFP package with various temperature‑grade options.
| Supply voltage | 3.3 V |
|---|---|
| Number of channels | 8 |
| Package type | 144‑Pin eLQFP |
| Operating temperature range | -40 °C to +85 °C |
| Master clock options | 1.544 MHz or 2.048 MHz (or multiples) |
| Impedance termination options | 75 Ω, 100 Ω, 110 Ω, 120 Ω |
| Jitter attenuator | 128‑bit crystal‑less |
It operates from a single 3.3 V power supply.
The device provides eight independent transmitters and receivers.
The master clock (MCLK) can be 1.544 MHz, 2.048 MHz, or a multiple of either.
Internal termination can be set to 75 Ω, 100 Ω, 110 Ω, or 120 Ω.