Analog Devices Inc. HMC721LC3CTR-R5

Overview

HMC721LC3CTR-R5 from Analog Devices (formerly Hittite Microwave) is a high-speed CML XOR/XNOR logic gate IC designed for ultra-high-frequency digital signal routing in serial data paths. It supports 14 Gbps data rates and 14 GHz clock frequencies, features programmable differential output voltage swing (600–1200 mV_p-p), 19/18 ps rise/fall times, and operates from a single -3.3 V supply. It is used in 16 G Fibre Channel interconnects and RF ATE systems requiring precise timing and low-jitter logic decisions.

For engineers reviewing the HMC721LC3CTR-R5 datasheet, HMC721LC3CTR-R5 pinout, HMC721LC3CTR-R5 application, or HMC721LC3CTR-R5 equivalent, key selection criteria include CML-compatible differential I/O, VR-controlled output amplitude tuning, sub-100 ps propagation delay, and operation over -40°C to +85°C in a 3×3 mm ceramic SMT package.

Technical Context

The HMC721LC3CTR-R5 implements a fully differential CML-based XOR/XNOR function with on-chip 50 Ω input terminations referenced to V_CC and GND. Its inputs accept both DC- and AC-coupled signals within -1.5 V to +0.5 V common-mode range and support single-ended or differential drive modes.

Output amplitude is actively adjusted via the VR pin (0–0.4 V), enabling real-time compensation for channel loss or interface level matching. The device delivers deterministic jitter of ≤2 ps_p-p and random jitter of 0.2 ps_rms at 13 GHz with 2¹⁵−1 PRBS input, and maintains >10 dB input/output return loss below 14 GHz.

Key Specifications

Pinout & Package

Package: 16-lead ceramic LCC (3×3 mm, 0.5 mm pitch), alumina body, gold-over-nickel plating, MSL3, exposed base soldered to V_ee.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC722LC3CTR-R5 and SY100EL15ZC, the HMC721LC3CTR-R5 uniquely balances 14 Gbps performance, on-the-fly output amplitude control, and compact 3×3 mm packaging-making it optimal for next-generation test instrumentation and high-density serial interconnects where flexibility and speed are co-prioritized.

Availability

HMC721LC3CTR-R5 is available at Aetrix Electronics and suitable for 16G Fibre Channel interconnects, RF ATE systems, and broadband test & measurement equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for HMC721LC3CTR-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 integrates its high-frequency RF and microwave IC portfolio into precision signal chain solutions.

The HMC721LC3CTR-R5 belongs to the Hittite High-Speed Logic family, engineered specifically for ultra-low-latency, high-fidelity digital signal processing in test, defense, and communications infrastructure.

FAQ

What is the recommended VR pin voltage range for HMC721LC3CTR-R5 to achieve full output swing adjustment?

The VR pin on the HMC721LC3CTR-R5 accepts 0 V to +0.4 V to tune differential output amplitude from 600 mV_p-p to 1200 mV_p-p. At VR = 0 V, output is minimized; at VR = +0.4 V, output reaches maximum. Operation outside this range may cause nonlinearity or damage. The HMC721LC3CTR-R5 datasheet specifies VR pin current as 2 mA at 0 V and 3.5 mA at +0.4 V, confirming safe biasing with standard voltage sources or DAC outputs.

Can HMC721LC3CTR-R5 accept single-ended inputs, and what are the interface requirements?

Yes, the HMC721LC3CTR-R5 supports single-ended inputs by terminating the complementary input to V_CC or GND per CML conventions. Each input pair (AN/AP, BN/BP) has on-chip 50 Ω termination to V_CC and GND, allowing either differential or single-ended drive. Input voltage range is -1.5 V to +0.5 V, and the HMC721LC3CTR-R5 maintains specified timing and jitter performance under both configurations when proper AC/DC coupling is applied.

What is the thermal resistance and maximum junction temperature specification for HMC721LC3CTR-R5?

The HMC721LC3CTR-R5 has a worst-case junction-to-package paddle thermal resistance (R_{th j-p}) of 59 °C/W. With a maximum continuous power dissipation of 0.68 W at 85 °C ambient (derated 17 mW/°C above), its maximum junction temperature is 125 °C. Proper soldering of the exposed base paddle to V_ee is mandatory to achieve this rating. The HMC721LC3CTR-R5 operates reliably from -40°C to +85°C case temperature under these thermal conditions.

Does HMC721LC3CTR-R5 require external termination resistors on its differential outputs?

No, the HMC721LC3CTR-R5 outputs are designed to drive 50 Ω ground-terminated systems directly. Its CML outputs have matched 50 Ω source impedance and are optimized for connection to 50 Ω transmission lines or instruments with 50 Ω inputs. Adding external series or shunt resistors degrades signal integrity and violates the HMC721LC3CTR-R5's specified rise/fall time and jitter performance. The HMC721LC3CTR-R5 evaluation board (118775) confirms this direct-drive architecture.

How does the HMC721LC3CTR-R5 handle input return loss, and why is it important for 14 Gbps operation?

The HMC721LC3CTR-R5 achieves ≥10 dB input return loss below 14 GHz due to its integrated 50 Ω on-die terminations referenced to V_CC and GND. This minimizes signal reflections that would distort eye diagrams and increase jitter at 14 Gbps. Maintaining high return loss ensures consistent signal launch into the gate, preserving timing margins critical for error-free operation in Fibre Channel and ATE applications. The HMC721LC3CTR-R5's return loss performance is verified across temperature and process corners in the official datasheet.