Analog Devices Inc./Maxim Integrated DS3112+

Overview

DS3112+ from Maxim Integrated is a TEMPE (T3/E3 MultiPlexEr) IC functioning as a T3/E3 framer, M13/E13/G.747 multiplexer, or standalone T3/E3 framer with integrated HDLC and FEAC controllers. It supports 28×T1→T3, 16×E1→E3, and 21×E1→T3 multiplexing, operates at 3.3V supply with 5V-tolerant I/O, and delivers T3/E3 alarm generation/detection and BERT-based performance monitoring for telecom access equipment.

For engineers reviewing the DS3112+ datasheet, DS3112+ pinout, DS3112+ application, or DS3112+ equivalent, this page provides verified functional identity, confirmed T3/E3 framing and M13/E13 multiplexing capability, validated 256-ball PBGA package mapping, real-world diagnostic loopback modes (Tx-to-Rx, line, payload), and accurate alternative part comparisons for wide-area network framer/mux selection.

Technical Context

The DS3112+ implements dual-path T3/E3 framing with independent receive/transmit sections: HRCLK/HRPOS/HRNEG inputs accept bipolar/unipolar T3/E3 data for framing and demultiplexing into T1/E1 streams output via LRCLK/LRDAT; LTCLK/LTDAT inputs accept T1/E1 data for two-step multiplexing and T3/E3 formatting before HTPOS/HTNEG transmission. It embeds IEEE 1149.1 JTAG for boundary-scan testability and supports C-bit parity mode per ANSI T1.107.

Its integrated HDLC controller handles LAPD messaging with 256-byte buffers without host intervention, while the FEAC controller manages frame-aligned error control. The on-chip BERT enables in-service bit error rate measurement, and diagnostics include T3/E3, T2/E2, and G.747 alarm detection per ITU G.703 and Bellcore GR-499-CORE standards.

Key Specifications

Pinout & Package

DS3112+ is housed in a 256-ball plastic ball grid array (PBGA) package with 1.27mm pitch, compliant with JEDEC MO-205 and Maxim's 56-G6002-001 mechanical specification. Pin functions are organized into dedicated groups: CPU bus (address/data/control), T3/E3 high-speed ports (HRCLK/HRPOS/HRNEG, HTCLK/HTPOS/HTNEG), T1/E1 low-speed ports (LTCLK/LTDAT/LRCLK/LRDAT), JTAG (TCK/TMS/TDI/TDO/TRST), and power/reset (VDD/VSS/RESET).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar T3/E3 framer and multiplexer applications.

Compared with DS3122+, DS3112+ offers full M13/E13/G.747 multiplexing and embedded controllers but lacks extended temperature rating and advanced BERT metrics; versus MC2822A, DS3112+ integrates multiplexing, framing, and control in one die-reducing board area and system-level design effort.

Availability

DS3112+ is available at Aetrix Electronics and suitable for wide area network access equipment, digital cross-connect systems, and telecom test equipment requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.

Supply support for DS3112+ 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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in analog and mixed-signal ICs for communications, computing, and industrial markets.

The DS3112+ belongs to Maxim's TEMPE product line, designed specifically for carrier-grade T/E-carrier framer, multiplexer, and diagnostic applications in telecom infrastructure equipment.

FAQ

What is the primary function of the DS3112+ in telecom systems?

The DS3112+ serves as a multifunctional T3/E3 framer and M13/E13/G.747 multiplexer used in wide-area network access equipment. It performs line-rate framing, multiplexing of T1/E1 signals into T3/E3 streams, alarm generation/detection, and embedded HDLC/FEAC control. Its role in telecom systems centers on consolidating lower-speed circuits into higher-speed trunks while maintaining strict ANSI and ITU compliance-making DS3112+ essential for digital cross-connects, PBXs, and optical multiplexers.

Does the DS3112+ support both T3 and E3 framing standards simultaneously?

No, the DS3112+ operates in either T3 mode or E3 mode-not simultaneously. Mode selection is configured at power-up via hardware pins (MODE[2:0]) and software registers. In T3 mode, it supports M13 multiplexing and T2 framing; in E3 mode, it enables E13 multiplexing and E2 framing. The DS3112+ does not perform concurrent T3 and E3 framing, but its architecture allows seamless reconfiguration between them during system initialization-ensuring flexibility for multi-standard deployments without hardware change.

What diagnostic loopback capabilities does the DS3112+ provide?

The DS3112+ provides three distinct diagnostic loopback modes: T3/E3 transmit-to-receive (Tx-to-Rx), line loopback (Rx-to-Tx), and payload loopback. These are implemented entirely within the device and controlled via register writes. Tx-to-Rx validates internal framer and formatter paths; line loopback tests the physical interface including B3ZS/HDB3 encoding/decoding; payload loopback isolates the multiplexing/demultiplexing logic. All modes are accessible without external hardware, making DS3112+ ideal for automated test and field diagnostics in routers and test equipment.

Is the DS3112+ pin-compatible with other devices in the DS31xx family?

The DS3112+ is not pin-compatible with DS3122+ or DS3102 due to differences in ball count, signal assignment, and power domain layout. While all share the 256-ball PBGA package, DS3122+ adds dedicated E3-specific pins and revised JTAG routing, and DS3102 uses a different pinout optimized for T1-only applications. Engineers must consult each device's pin description table (Section 2 of respective datasheets) before substitution. DS3112+ pinout is fixed per Maxim's 56-G6002-001 mechanical spec and cannot be interchanged without PCB redesign.

How does the DS3112+ handle T1/E1 drop-and-insert functionality?

The DS3112+ supports two independent T1/E1 drop-and-insert ports, each capable of extracting and inserting full-rate T1 (1.544Mbps) or E1 (2.048Mbps) signals from/to the T3/E3 payload. This is achieved through dedicated low-speed port logic (LTCLK/LTDAT/LRCLK/LRDAT) and internal time-slot assignment registers. The DS3112+ performs bit-level synchronization and maintains payload integrity during add/drop operations-enabling service provisioning in digital cross-connect systems without requiring external mux/demux chips or FPGA logic.