Analog Devices Inc./Maxim Integrated DS3112N+

Overview

DS3112N+ from Maxim Integrated is a TEMPE (T3/E3 MultiPlexEr) IC functioning as a programmable M13/E13/G.747 multiplexer or standalone T3/E3 framer, supporting 28×T1→T3, 16×E1→E3, or 21×E1→T3 configurations with integrated HDLC and FEAC controllers, BERT, and T3/E3/T2/E2 alarm generation/detection.

For engineers reviewing the DS3112N+ datasheet, DS3112N+ pinout, DS3112N+ application, or DS3112N+ equivalent, this device serves in carrier-grade access equipment requiring precise T-carrier/E-carrier framing, drop-and-insert functionality, C-bit parity mode support, and IEEE 1149.1 JTAG testability across -40°C to +85°C industrial temperature range.

Technical Context

The DS3112N+ implements dual-path signal processing: receive path accepts bipolar/unipolar T3/E3 data via HRCLK/HRPOS/HRNEG, performs framing and two-step demultiplexing to output T1/E1 streams on LRCLK/LRDAT; transmit path ingests T1/E1 data at LTCLK/LTDAT, applies two-step multiplexing and T3/E3 formatting before outputting framed data on HTPOS/HTNEG using HTCLK.

It integrates three independent framer subsystems-T3/E3 framer (with C-bit parity mode), T2/E2 framer (supporting G.747), and low-speed T1/E1 ports-with dedicated diagnostic loopbacks (Tx→Rx, Rx→Tx, payload), BERT for performance monitoring, and autonomous HDLC controller handling LAPD messaging without host CPU intervention.

Key Specifications

Pinout & Package

DS3112N+ is housed in a 256-ball plastic ball grid array (PBGA) package with 1.27mm pitch, designed for thermal and electrical performance in carrier-class line cards. Pin functions are organized into CPU bus interface, T3/E3 high-speed receive/transmit ports, T1/E1 low-speed receive/transmit ports, JTAG test interface, and power/reset signals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS3122N+, DS3112N+ offers smaller footprint and lower power but omits native T1/E1 framer; versus MC28L34A, it delivers full E3 support, 3.3V operation, and advanced diagnostics essential for new telecom designs.

Availability

DS3112N+ is available at Aetrix Electronics and suitable for wide area network access equipment, digital cross-connect systems, PBX trunk interfaces, and telecom test instrumentation requiring stable component supply across extended temperature ranges.

Supply support for DS3112N+ 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 U.S.-based semiconductor company specializing in precision analog, mixed-signal, and high-reliability ICs for communications, industrial, and computing markets.

The DS3112N+ belongs to Maxim's TEMPE family of T/E-carrier framer/multiplexer ICs, engineered specifically for carrier-class telecom infrastructure demanding multi-standard compliance, diagnostic depth, and industrial temperature operation.

FAQ

What is the operating temperature range for DS3112N+?

The DS3112N+ is rated for industrial operation from -40°C to +85°C, making it suitable for deployment in uncontrolled environments such as outdoor cabinets, central office line cards, and remote access nodes where ambient temperatures exceed commercial grade limits. This rating is confirmed in Maxim's official ordering information table and applies specifically to the "N+" suffix variant.

Does DS3112N+ support both T3 and E3 framing standards?

Yes, DS3112N+ natively supports both T3 (ANSI) and E3 (ITU) framing standards, including B3ZS encoding for T3 and HDB3 decoding for E3. It also handles T2/E2 framing and G.747 multiplexing, enabling interoperability across North American and European carrier networks without hardware modification.

How does the DS3112N+ implement drop-and-insert functionality?

The DS3112N+ provides two dedicated T1/E1 drop-and-insert ports that operate independently of the main multiplexer path. These ports allow selective extraction and insertion of individual DS1 or E1 time slots from a T3/E3 frame, enabling circuit-level grooming in digital cross-connect systems while maintaining full frame synchronization and alarm transparency.

Is DS3112N+ pin-compatible with DS3112 or DS3112N?

No, DS3112N+ is not pin-compatible with DS3112 or DS3112N. While all share the same 256-ball PBGA package and pinout, the "+" suffix denotes lead-free/RoHS-compliant construction with revised thermal and soldering profiles. Electrical and functional behavior remains identical, but PCB assembly processes must account for Pb-free reflow requirements.

What diagnostic loopback modes are supported by DS3112N+?

The DS3112N+ supports three distinct loopback modes: T3/E3 line loopback (Rx→Tx path), T3/E3 diagnostic loopback (Tx→Rx path), and T3/E3 payload loopback (framed payload only). Each mode is independently configurable via register writes and used for isolating faults in physical layer, framer logic, or multiplexing stages during system bring-up or field maintenance.