Analog Devices Inc. HMC726LC3CTR-R5

Overview

HMC726LC3CTR-R5 from Analog Devices (formerly Hittite Microwave) is a high-speed CML logic gate IC supporting configurable AND/NAND/OR/NOR functions in RF and serial data systems. It delivers 14 Gbps data rate, 14 GHz clock frequency, 19/18 ps rise/fall time, and operates from a single -3.3 V supply in a 3×3 mm ceramic SMT package.

For engineers reviewing the HMC726LC3CTR-R5 datasheet, HMC726LC3CTR-R5 pinout, HMC726LC3CTR-R5 application, or HMC726LC3CTR-R5 equivalent, key selection criteria include differential CML I/O compatibility, sub-100 ps propagation delay, jitter performance (0.2 ps rms random, 2 ps p-p deterministic), and ROHS-compliant 16-lead ceramic packaging for high-frequency signal integrity.

Technical Context

The HMC726LC3CTR-R5 implements fully differential CML logic with on-chip 50 Ω termination to Vee (–3.3 V) and GND on all inputs and source-terminated 50 Ω outputs. Its architecture supports reconfigurable logic function selection via external biasing without internal control lines.

It targets ultra-high-speed serial links requiring precise timing fidelity: propagation delay is fixed at 95 ps, small-signal gain is 27 dB, and output return loss exceeds 10 dB below 14 GHz - enabling direct interfacing with 50 Ω ground-terminated systems or downstream CML receivers.

Key Specifications

Pinout & Package

Package: 16-lead ceramic LCC (3×3 mm, 9 mm²), alumina body, gold-over-nickel plating, MSL3, exposed paddle soldered to PCB ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC854LC3TR and SY100EL15ZC, the HMC726LC3CTR-R5 uniquely combines 14 Gbps capability, full logic configurability, on-chip 50 Ω termination, and 3×3 mm ceramic packaging - making it the only option for new designs targeting 14 GHz clock distribution or 16 G Fiber Channel logic layers.

Availability

HMC726LC3CTR-R5 is available at Aetrix Electronics and suitable for 16 G Fiber Channel systems, RF ATE platforms, and broadband test & measurement equipment requiring stable component supply, long-term lifecycle support, and guaranteed ROHS-compliant sourcing.

Supply support for HMC726LC3CTR-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, microwave, and high-speed logic portfolio into precision signal chain solutions.

The HMC726LC3CTR-R5 belongs to Hittite's HIGH SPEED LOGIC - SMT product line, engineered specifically for ultra-low-jitter, multi-Gbps serial data conditioning and reconfigurable logic in test instrumentation, optical networking, and defense electronics.

FAQ

What logic functions does the HMC726LC3CTR-R5 support?

The HMC726LC3CTR-R5 supports four configurable logic functions - AND, NAND, OR, and NOR - selected via external biasing of its differential CML inputs. No internal control pins or configuration registers are required. This flexibility allows one HMC726LC3CTR-R5 device to replace multiple fixed-function gates in high-speed digital designs, reducing BOM count and PCB area while maintaining 14 Gbps performance.

Does the HMC726LC3CTR-R5 require external termination resistors?

No, the HMC726LC3CTR-R5 integrates on-chip 50 Ω termination to both Vee (–3.3 V) and GND on all differential inputs (AN/AP, BN/BP), and features source-terminated 50 Ω outputs (DP/DN). This eliminates the need for external termination resistors, simplifying layout, improving signal integrity, and reducing parasitic effects in >10 GHz applications - a key advantage over discrete termination approaches used with older CML logic families.

What is the recommended power supply decoupling for the HMC726LC3CTR-R5?

The HMC726LC3CTR-R5 requires local decoupling on each Vee pin (pins 13 and 16): a 4.7 µF tantalum capacitor in parallel with a 100 pF 0402 ceramic capacitor, placed within 2 mm of the pin. This dual-capacitor network suppresses low- and high-frequency supply noise, ensuring stable 14 Gbps operation and minimizing deterministic jitter. The exposed paddle must also be soldered to a solid ground plane for optimal thermal and RF performance.

Can the HMC726LC3CTR-R5 be AC-coupled on inputs and outputs?

Yes, the HMC726LC3CTR-R5 supports both AC- and DC-coupled operation on all differential inputs (AN/AP, BN/BP) and outputs (DP/DN). Its CML inputs are biased internally and tolerate common-mode voltages from –1.5 V to +0.5 V; outputs swing between –560 mV and –10 mV (single-ended), allowing seamless integration with AC-coupled 50 Ω transmission lines and transformer-based interfaces commonly used in test equipment and optical modules.

Is the HMC726LC3CTR-R5 pin-compatible with other Hittite logic gates like the HMC854LC3TR?

No, the HMC726LC3CTR-R5 is not pin-compatible with the HMC854LC3TR. Although both use the same 3×3 mm ceramic package, their pin functions differ: HMC726LC3CTR-R5 assigns pins 2/3 and 6/7 to two independent differential inputs (A and B), while HMC854LC3TR uses different pin allocations for its dedicated AND/NAND inputs and outputs. Layout redesign is required when substituting between these parts - they are functional alternatives, not drop-in replacements.