This product is a complete E1, T1 or J1 line interface unit (LIU) for both long-haul and short-haul trunks
The DS21348 and DS21Q348 are complete 3.3 V line interface units that support E1, T1, and J1 (J1 = T1) applications for both long‑haul and short‑haul trunks. The datasheet lists features such as selectable receive‑side termination, crystal‑less jitter attenuation, programmable monitor mode, loopback and PRBS capabilities, and support for Intel or Motorola parallel bus interfaces.
Technical sections cover pin descriptions, hardware mode operation, control and status registers, diagnostics, analog interface details, DC/thermal/AC characteristics, and package drawings for the 44‑pin TQFP, 49‑ball CSBGA, and 144‑ball CSBGA variants.
| Supply Voltage | 3.3 V |
|---|---|
| Operating Temperature Range | -40 °C to +85 °C |
| Master Clock Frequency | 2.048 MHz (or 1.544 MHz for T1) |
The device operates from a 3.3 V power supply.
It is rated for operation from –40 °C to +85 °C.
A 2.048 MHz master clock is required, with an optional 1.544 MHz clock for T1 operation.