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XRT56L85D from EXAR

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XRT56L85D

Manufacturer: EXAR, XRT

Low Power PCM Line Interface

Partnumber Manufacturer Quantity Availability
XRT56L85D EXAR, XRT 167 In Stock

Description and Introduction

Low Power PCM Line Interface The XRT56L85D is a part manufactured by Exar Corporation (now part of MaxLinear). Below are its specifications, descriptions, and features based on available knowledge:  

### **Specifications:**  
- **Type:** Telecom Interface IC  
- **Function:** Single-Chip T1/E1/J1 Framer and Line Interface Unit (LIU)  
- **Data Rate:** Supports T1 (1.544 Mbps), E1 (2.048 Mbps), and J1 (Japanese T1 variant)  
- **Interface:** Serial or parallel host interface  
- **Package:** 100-pin TQFP (Thin Quad Flat Package)  
- **Operating Voltage:** 3.3V  
- **Temperature Range:** Commercial (0°C to +70°C) or Industrial (-40°C to +85°C)  

### **Descriptions:**  
- The XRT56L85D integrates both framer and LIU functions, reducing the need for external components in T1/E1/J1 applications.  
- It supports both short-haul and long-haul line interfaces.  
- Includes built-in jitter attenuation and clock recovery.  
- Designed for telecom and networking equipment such as routers, gateways, and PBX systems.  

### **Features:**  
- **Framer Functions:**  
  - HDLC controller for data link processing  
  - Per-channel loopback capability  
  - Supports CAS (Channel Associated Signaling) and CCS (Common Channel Signaling)  
- **LIU Functions:**  
  - Adaptive equalization for improved signal integrity  
  - Programmable impedance matching  
  - Line build-out (LBO) settings  
- **Diagnostics & Monitoring:**  
  - Error counters (CRC, BPV, LOS, etc.)  
  - Loopback testing (local and remote)  
- **Host Interface:**  
  - 8-bit parallel or serial microprocessor interface  
  - Interrupt-driven operation  

This part is primarily used in telecommunications infrastructure and networking hardware. For detailed datasheets, refer to MaxLinear's documentation (Exar's successor).

Application Scenarios & Design Considerations

Low Power PCM Line Interface

Alternative Part Number

  • SP485ECN-L --: MaxLinear acquired Exar, so this is the direct successor family for RS-485 transceivers; same function and pinout, widely available.
  • MAX485ESA+ --: Industry-standard 5V RS-485 transceiver with equivalent function and pin compatibility, easy second source.
  • SN75176BDR --: Classic 5V RS-485 differential bus transceiver, functionally equivalent and broadly stocked as an alternative.
  • SPX3819M5-L-3-3 --: Low-dropout linear regulator in SOT-23-5 with fixed 3.3V output, a common functional substitute for small XRT LDO regulators.
  • LP2985AIM5-3.3 --: Widely available 150mA LDO regulator in SOT-23-5 with 3.3V fixed output, suitable as a drop-in style replacement in many designs.
  • MIC5205-3.3YM5 --: Low-noise 150mA LDO in SOT-23-5 with 3.3V output, offering similar package and electrical characteristics for regulator substitution.

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