Renesas 82V2048DAG

Overview

82V2048DAG from Integrated Device Technology (IDT) is an octal T1/E1 short-haul line interface unit (LIU) integrating eight independent transceivers for telecom access systems. It supports 100 Ω T1, 120 Ω E1 twisted pair, and 75 Ω E1 coaxial interfaces; provides selectable Single/Dual Rail operation; implements B8ZS/HDB3 or AMI encoding/decoding; and delivers G.703/T1.102-compliant transmit pre-equalization. It is used in SDH/SONET multiplexers and digital radio base stations.

For engineers reviewing the 82V2048DAG datasheet, 82V2048DAG pinout, 82V2048DAG application, or 82V2048DAG equivalent, key selection criteria include jitter attenuation path configuration (TX/RX), LOS detection compliance (ITU G.775, ETS 300 233), non-intrusive G.772 monitoring capability, hardware vs. serial/parallel host interface mode, and dual-rail NRZ data recovery without clock retiming.

Technical Context

The 82V2048DAG integrates eight identical channels, each with independent DPLL-based clock and data recovery, programmable jitter attenuators switchable into either transmit or receive paths, and analog loopback, remote loopback, and digital loopback test modes. Its transmit path includes waveform shaping and pre-equalization meeting G.703 and T1.102; its receive path supports both clock-recovered NRZ output (RDn) and raw RZ sliced outputs (RDPn/RDNn) with configurable polarity via CLKE.

It features a flexible control architecture supporting hardware mode (MODE[2:0], TS[2:0]), serial SPI-like interface (CS/SCLK/SDI/SDO), or Intel/Motorola-compatible 8-bit parallel interface (multiplexed or non-multiplexed). JTAG boundary scan (TRST/TCK/TMS/TDI/TDO) enables board-level test, while G.772 monitoring allows real-time in-service testing of any channel 1–7 using channel 0 as dedicated monitor port.

Key Specifications

Pinout & Package

82V2048DAG is packaged in a 144-pin Thin Quad Flat Pack (TQFP) with exposed thermal pad. Pin assignments are defined for two primary functional groups: eight identical channel I/Os (TTIPn/TRINGn, RTIPn/RRINGn, TDn/TDPn/TDNn, RDn/RDPn/RDNn, TCLKn/RCLKn, LOSn, CVn) and shared control resources (MODE[2:0], TS[2:0], LP[7:0], CS/JAS, SCLK/SDI/SDO, parallel bus, JTAG, power/ground).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar T1/E1 line interface applications.

Compared with DS2155T and MC34673, the 82V2048DAG uniquely combines octal integration, G.772 monitoring, JTAG testability, and three control modes (hardware/serial/parallel), making it optimal for high-availability telecom infrastructure where field diagnostics and layout flexibility are critical.

Availability

82V2048DAG is available at Aetrix Electronics and suitable for central office digital cross-connects, wireless base station backhaul, and SDH/SONET add-drop multiplexers requiring stable component supply across extended product lifecycles.

Supply support for 82V2048DAG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Integrated Device Technology (IDT) was a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance interconnect solutions before its acquisition by Renesas Electronics in 2019.

The 82V2048DAG belongs to IDT's telecom line interface product line, designed specifically for carrier-grade T1/E1 short-haul access equipment requiring integrated jitter management, robust LOS detection, and in-service monitoring capabilities.

FAQ

What is the primary function of the 82V2048DAG in a T1/E1 system?

The 82V2048DAG serves as an octal short-haul line interface unit, providing full physical layer termination for eight independent T1 or E1 channels. It performs clock and data recovery, line encoding/decoding (AMI/B8ZS/HDB3), transmit pre-equalization, jitter attenuation, and LOS detection - all within a single 144-pin TQFP package. Its role is to bridge digital system logic to bipolar line signals while maintaining strict ITU and ANSI compliance.

Does the 82V2048DAG support both T1 and E1 line rates simultaneously?

No - the 82V2048DAG operates globally in either T1 mode (1.544 MHz) or E1 mode (2.048 MHz), selected via hardware pins TS[2:0] or software register configuration. All eight channels must run at the same line rate; mixed-rate operation across channels is not supported. The device does not auto-detect line rate - mode selection is explicit and static per power-on or reset cycle.

How does the G.772 monitoring feature work on the 82V2048DAG?

The 82V2048DAG implements ITU G.772 non-intrusive monitoring by routing signals from any one of channels 1–7 to channel 0's receive data outputs (RDP0/RDN0) without disrupting live traffic. Configuration is done via MC[3:0] pins in hardware mode or corresponding registers in host mode. This enables real-time in-service testing of line integrity, error performance, and signal quality on active links using standard test equipment connected to channel 0.

What are the power supply requirements for the 82V2048DAG?

The 82V2048DAG requires three distinct supply domains: 3.3 V for digital core and I/O (VDDD, VDDA, VDDIO), 3.3 V or 5 V for all eight transmitter drivers (VDDT0–VDDT7 - all must be at same voltage), and analog/digital ground planes (GNDD, GNDA, GNDIO, GNDTn). The VDDT supply must be uniformly set to either 3.3 V or 5 V across all channels; mixing voltages or leaving any VDDT pin unconnected violates specifications and may cause malfunction.

Can the 82V2048DAG operate without a host processor?

Yes - the 82V2048DAG supports hardware control mode using dedicated pins (MODE[2:0], TS[2:0], LP[7:0], CODE, OE) to configure line coding, loopback, template selection, and monitoring without software intervention. In this mode, it functions as a self-contained LIU with fixed configuration, ideal for space-constrained or firmware-limited applications such as remote radio units or legacy backplane interfaces.