THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR The XRT75R03IV is a T1/E1/J1 LIU (Line Interface Unit) manufactured by EXAR Corporation. Below are the factual details about the part:
### **Specifications:**
1. **Interface Type:** T1/E1/J1 Line Interface Unit (LIU).
2. **Supply Voltage:** 3.3V ±10%.
3. **Operating Temperature Range:** -40°C to +85°C.
4. **Package:** 64-pin TQFP (Thin Quad Flat Package).
5. **Compliance:** Meets ITU-T G.703, G.704, G.706, G.823, and ANSI T1.102, T1.403, T1.408 standards.
6. **Data Rate:** Supports 1.544 Mbps (T1/J1) and 2.048 Mbps (E1).
7. **Transmit and Receive Channels:** 3 independent channels.
8. **Line Impedance:** 100Ω (E1) or 100Ω/110Ω (T1/J1).
9. **Jitter Attenuation:** Built-in jitter attenuator for both transmit and receive paths.
10. **Short-Circuit Protection:** On-chip protection for line drivers.
### **Descriptions:**
- The XRT75R03IV is a highly integrated LIU designed for T1, E1, and J1 applications.
- It provides a complete physical layer solution, including line termination, waveform shaping, and clock recovery.
- The device supports both long-haul and short-haul applications.
### **Features:**
1. **Triple-Channel LIU:** Three independent T1/E1/J1 transceivers in a single chip.
2. **Flexible Clocking:** Supports both internal and external clocking modes.
3. **Loopback Modes:** Digital, analog, and remote loopback for diagnostics.
4. **Programmable Output Waveform:** Adjustable pulse shapes for compliance with various standards.
5. **Low Power Consumption:** Optimized for power-sensitive applications.
6. **Integrated BERT (Bit Error Rate Test):** Supports PRBS generation and detection.
7. **Software Configurable:** Control via a serial microprocessor interface.
8. **LED Indicators:** Status monitoring for alarms and signal presence.
This information is based on EXAR's official documentation for the XRT75R03IV.
