Analog Devices Inc./Maxim Integrated MAX3783UCM-D

Overview

The MAX3783UCM-D from Maxim Integrated is a dual-channel 2.7Gbps serial multiplexer and buffer with selectable line-side loopback, designed for high-speed system interconnect and serial backplane applications. It features CML I/O, on-chip 100Ω differential input impedance and 50Ω output termination, 11ps deterministic jitter, and operates from a single 3.3V supply in a 48-pin TQFP-EP package.

For engineers reviewing the MAX3783UCM-D datasheet, MAX3783UCM-D pinout, MAX3783UCM-D application, or MAX3783UCM-D equivalent, key selection criteria include deterministic jitter performance, loopback configurability for system test, CML/PECL AC-coupling compatibility, and dual-channel redundancy for fail-over switching.

Technical Context

The MAX3783UCM-D implements two independent signal paths, each integrating a 2:1 receiver mux (LI1_/LI2_ → SO_) and a transmitter with dual fanout (SI_ → LO1_/LO2_). Control logic uses TTL-compatible SELA/SELB and LB1A–LB2B inputs with internal 15kΩ pull-ups to configure routing and loopback modes.

Its CML interface supports AC-coupled PECL operation via external biasing, while on-chip 50Ω output back-termination and 100Ω differential input termination eliminate need for external resistors. Propagation delay is 340–500ps (LI_/SI_ to LO_/SO_), and multiplexer switch time is 9ns after SEL_/LB_ assertion.

Key Specifications

Pinout & Package

The MAX3783UCM-D is housed in a 48-pin TQFP-EP (exposed pad) package. The exposed pad must be soldered to ground for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel serial mux/buffer applications.

Compared with MAX3783UCM-D, MAX3785UCM+ offers higher bandwidth but same footprint and feature set, while DS10BR150TSD/NOPB lacks dual-channel integration, loopback, and CML compatibility-making it unsuitable for backplane or fail-over use cases.

Availability

MAX3783UCM-D is available at Aetrix Electronics and suitable for serial backplane interconnect, redundant telecom line card switching, and high-speed test equipment requiring stable component supply and long-term lifecycle support.

Supply support for MAX3783UCM-D 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 high-performance analog, mixed-signal, and RF solutions for communications, computing, and industrial markets.

The MAX3783UCM-D belongs to Maxim's high-speed serial interface product line, engineered specifically for robust, low-jitter signal routing in telecom backplanes and fault-tolerant serial interconnects.

FAQ

What is the maximum guaranteed data rate for the MAX3783UCM-D?

The MAX3783UCM-D is guaranteed to operate at 2.75 Gbps with full specification compliance, including jitter and eye diagram performance. Electrical characterization confirms functionality up to 3.125 Gbps under typical conditions, but 2.75 Gbps is the rated maximum for production use across temperature and voltage ranges. The MAX3783UCM-D datasheet specifies this limit in the Absolute Maximum Ratings and Electrical Characteristics tables.

Does the MAX3783UCM-D require external termination resistors?

No, the MAX3783UCM-D integrates 100Ω differential input termination and 50Ω single-ended output termination on-chip. This eliminates the need for external resistors on CML inputs and outputs, reducing PCB area and component count. External AC-coupling capacitors are still required for PECL compatibility, but termination is fully internal for both directions in the MAX3783UCM-D.

How does loopback operation work on the MAX3783UCM-D?

Loopback on the MAX3783UCM-D is controlled per-output via dedicated TTL-compatible pins: LB1A, LB2A, LB1B, and LB2B. When pulled low, each enables internal connection from its corresponding LO_ output back to the associated LI_ input pair, allowing full transceiver chain verification without external hardware. All loopback controls have internal 15kΩ pull-up resistors, so they default to inactive unless actively driven low in the MAX3783UCM-D.

Is the MAX3783UCM-D compatible with PECL signaling?

Yes, the MAX3783UCM-D supports AC-coupled PECL operation through its CML I/O structure. By adding external DC-bias networks and coupling capacitors, PECL signals can be interfaced directly to the MAX3783UCM-D's differential inputs and outputs. Application notes HFAN-01.0 and HFAN-01.1 detail recommended biasing schemes for reliable PECL/CML interoperability in the MAX3783UCM-D.

What is the role of the exposed pad on the MAX3783UCM-D package?

The exposed pad on the MAX3783UCM-D's 48-pin TQFP-EP package serves dual thermal and electrical functions: it provides a low-thermal-resistance path to dissipate 1.12W typical power and is electrically connected to ground. Maxim specifies that the pad must be soldered to a grounded copper plane on the PCB; failure to do so risks thermal overload and degraded signal integrity. This requirement is explicitly stated in the MAX3783UCM-D datasheet's Exposed-Pad section.