Analog Devices Inc. HMC854LC5TR

Overview

HMC854LC5TR from Analog Devices (formerly Hittite Microwave) is a high-speed 4:1 multiplexer IC designed for 28 Gbps NRZ data serialization in optical and serial interconnect systems. It features CML-compatible differential I/O, on-chip quarter-rate clock generation, programmable output voltage swing (700–1250 mV), and operates from a single -3.3 V supply. Used in SONET OC-192 and FPGA-based high-speed serializer applications.

For engineers reviewing the HMC854LC5TR datasheet, HMC854LC5TR pinout, HMC854LC5TR application, or HMC854LC5TR equivalent, key selection criteria include its 28 Gbps maximum data rate, 14 GHz half-rate clock input capability, 16 ps rise/fall time, -40 °C to +85 °C operating temperature range, and 32-lead 5×5 mm ceramic SMT package with exposed paddle grounding.

Technical Context

The HMC854LC5TR implements a current-mode logic (CML) architecture with latching on the rising edge of the input clock and serialization using both edges of the half-rate clock. Its internal quarter-rate reference clock output enables precise timing synchronization across multi-lane data paths.

All inputs are internally terminated to 50 Ω across Vee, GND, or positive supply depending on signal polarity, supporting DC or AC coupling. Outputs are source-terminated to 50 Ω and feature a dedicated VR pin for real-time output amplitude tuning-critical for loss compensation in long PCB traces or backplane channels.

Key Specifications

Pinout & Package

Package: 32-lead ceramic LCC (Leadless Chip Carrier), 5 mm × 5 mm body, alumina substrate, gold-over-nickel plating, MSL3, exposed paddle requiring solder connection to Vee.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed multiplexer applications.

Compared with HMC854LC5TR, HMC987LP5E offers higher speed but adds power complexity, while LMH3401IRSNR simplifies supply design at the cost of data rate and integrated timing-making HMC854LC5TR optimal for balanced 28 Gbps serial aggregation with self-synchronized clocking.

Availability

HMC854LC5TR is available at Aetrix Electronics and suitable for SONET OC-192 infrastructure, FPGA-based high-speed serializer interfaces, and broadband test equipment requiring stable component supply across extended production lifecycles.

Supply support for HMC854LC5TR 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

Analog Devices acquired Hittite Microwave in 2014 and integrates its high-frequency RF, microwave, and millimeter-wave IC portfolio into precision signal processing solutions.

The HMC854LC5TR belongs to Analog Devices' high-speed data converter and interface product line, engineered specifically for optical transport, test instrumentation, and FPGA-ASIC interconnect applications demanding sub-20 ps edge rates and deterministic jitter performance.

FAQ

What is the maximum supported data rate for the HMC854LC5TR?

The HMC854LC5TR supports a maximum data rate of 28 Gbps in NRZ mode, verified under standard test conditions (TA = +25 °C, Vee = −3.3 V, VR = 0 V). It also supports 2:1 multiplexing at 14 Gbps in both RZ and NRZ formats. This rating is measured with PRBS2^15 patterns and confirmed via eye diagram analysis at 28 Gbps on evaluation boards.

How does the VR pin affect output performance in the HMC854LC5TR?

The VR pin on the HMC854LC5TR directly controls differential output voltage swing between 700 mV and 1250 mV, as shown in the "Output Differential vs. VR" plot in the datasheet. Applying a voltage from −1.2 V to +0.4 V adjusts amplitude for channel loss compensation-enabling optimization without redesigning termination networks. At VR = 0 V, typical swing is 1000 mV.

Does the HMC854LC5TR require external termination resistors?

No, the HMC854LC5TR integrates 50 Ω on-chip termination for all CML inputs (data and clock), eliminating the need for external resistors. Differential outputs are source-terminated to 50 Ω and can drive directly into 50 Ω ground-terminated systems. External AC coupling capacitors may still be used if DC blocking is required, but termination is fully internal.

What is the purpose of the C/4± pins on the HMC854LC5TR?

The C/4± pins on the HMC854LC5TR provide a differential quarter-rate clock output derived from the input half-rate clock. This on-chip generated reference enables synchronous sampling or clock forwarding to downstream devices (e.g., CDRs or deserializers), reducing system-level jitter and eliminating external clock division circuitry that would degrade timing integrity.

What thermal and mechanical requirements apply to the HMC854LC5TR package?

The HMC854LC5TR uses a 32-lead ceramic LCC with an exposed metal paddle that must be soldered to the −3.3 V (Vee) plane. Thermal resistance (Rth j-p) is 30 °C/W. The package is rated for operation from −40 °C to +85 °C, with storage up to +150 °C. Per MSL3 handling, peak reflow temperature must not exceed 260 °C.