Analog Devices Inc. HMC851LC3CTR-R5

Overview

HMC851LC3CTR-R5 from Analog Devices (formerly Hittite Microwave) is a high-speed CML XOR/XNOR logic gate IC designed for ultra-high-speed serial data path conditioning in test and measurement systems. It supports 28 Gbps data rates and 28 GHz clock frequencies, features programmable differential output voltage swing (500–1300 mV_p-p), 97 ps propagation delay, and operates from a single -3.3 V supply in a 3×3 mm ceramic SMT package.

For engineers reviewing the HMC851LC3CTR-R5 datasheet, HMC851LC3CTR-R5 pinout, HMC851LC3CTR-R5 application, or HMC851LC3CTR-R5 equivalent, key selection considerations include its 28 Gbps capability, on-chip 50 Ω input termination, VR-controlled output amplitude, sub-100 ps propagation delay, and compatibility with RF ATE and broadband serial interconnects requiring precise jitter performance (0.2 ps rms random jitter).

Technical Context

The HMC851LC3CTR-R5 implements a true differential CML logic core with fully terminated 50 Ω inputs (AC/DC-coupled capable) and rail-to-rail CML outputs referenced to Vee. Its internal architecture enables deterministic timing behavior across temperature (-40°C to +85°C) with <2 ps peak-to-peak deterministic jitter at 28 Gbps using 2¹⁵−1 PRBS input.

Operation relies on a negative single supply (-3.3 V), with all ground leads and the exposed paddle soldered directly to RF/DC ground per layout guidelines. The VR pin provides analog control over differential output swing without altering propagation delay or rise/fall time (15/14 ps typ.), enabling loss compensation in high-frequency PCB traces.

Key Specifications

Pinout & Package

Package: 16-lead ceramic LCC (3×3 mm, 0.5 mm pitch), RoHS-compliant, alumina body with gold-over-nickel plating, MSL3, thermal resistance 59 °C/W (junction-to-paddle). Exposed paddle must be soldered to Vee.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC851LC3CTR-R5, the HMC852LC3CTR-R5 offers functional duplication in the same package for space-constrained dual-channel designs, while the LMH3401IRGET serves a fundamentally different signal-conditioning role and cannot replace XOR/XNOR logic functionality.

Availability

HMC851LC3CTR-R5 is available at Aetrix Electronics and suitable for RF ATE systems, broadband test equipment, and 28 Gbps serial data transmission applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for HMC851LC3CTR-R5 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 maintains its high-frequency RF and microwave product lines, including millimeter-wave ICs and high-speed logic solutions.

The HMC851LC3CTR-R5 belongs to Hittite's High Speed Logic family, engineered specifically for >25 Gbps serial data infrastructure in test instrumentation, optical interconnects, and advanced communications systems.

FAQ

What is the maximum data rate supported by the HMC851LC3CTR-R5?

The HMC851LC3CTR-R5 supports a maximum data rate of 28 Gbps, verified with 2¹⁵−1 PRBS input patterns at 28 Gbps under standard conditions (T_A = +25°C, V_ee = -3.3 V). This rating applies to both XOR and XNOR modes and is specified with ≤2 ps peak-to-peak deterministic jitter and 0.2 ps rms random jitter, making HMC851LC3CTR-R5 suitable for CEI-28G and PCIe Gen6 physical layer validation.

How does the VR pin affect the operation of the HMC851LC3CTR-R5?

The VR pin on the HMC851LC3CTR-R5 is an analog control input that adjusts the differential output voltage swing from 500 mV_p-p to 1300 mV_p-p without altering propagation delay, rise/fall time, or DC bias. Applying voltages from -0.4 V to +0.4 V to VR scales output amplitude linearly, enabling real-time loss compensation in high-frequency PCB traces or cables. For normal operation, VR is shorted to GND via jumper JP1 on the evaluation board.

What package type and mounting requirements apply to the HMC851LC3CTR-R5?

The HMC851LC3CTR-R5 uses a 16-lead ceramic LCC package measuring 3×3 mm with 0.5 mm pitch and an exposed metal paddle. All eight ground pins (1, 4, 5, 8, 9, 12, 13, 16) and the paddle must be soldered to a low-inductance RF/DC ground plane using multiple thermal vias. The paddle is electrically connected to Vee and must be soldered to the -3.3 V net - failure to do so risks thermal overload and timing degradation in the HMC851LC3CTR-R5.

Can the HMC851LC3CTR-R5 accept AC-coupled inputs and drive AC-coupled loads?

Yes, the HMC851LC3CTR-R5 supports both AC- and DC-coupled inputs and outputs. Its on-chip 50 Ω terminations to ground allow direct AC coupling without external biasing networks. For AC-coupled outputs, DC blocking capacitors are required only when driving a 50 Ω load referenced to a non-ground DC voltage; otherwise, outputs connect directly to 50 Ω-to-ground systems. This flexibility simplifies integration into existing CML signal chains without redesigning interface circuitry for the HMC851LC3CTR-R5.

What is the supply voltage range and power consumption of the HMC851LC3CTR-R5?

The HMC851LC3CTR-R5 operates from a single -3.3 V supply, with an absolute maximum rating of -3.75 V and minimum of -3.0 V. Typical supply current is 73 mA, resulting in ~241 mW power dissipation. At T_A = +85°C, derating begins at 17 mW/°C above 85°C, with a maximum continuous power dissipation of 0.68 W. These values are measured with VR = 0 V and 28 GHz input signals, confirming the HMC851LC3CTR-R5 delivers industry-leading speed-per-watt efficiency in its class.