Renesas ISL36111DRZ-T7

Overview

ISL36111DRZ-T7 from Renesas Electronics (formerly Intersil) is a single-channel 11.1 Gb/s receive-side lane extender IC designed for high-speed serial interconnects in active copper cable assemblies. It features CML I/O, adjustable equalization boost via two control pins, 1.2V supply operation, and integrated Loss-of-Signal (LOSB) detection. It extends signal reach up to 10m on 28AWG twin-axial cable in SFP+/QSFP modules.

For engineers reviewing the ISL36111DRZ-T7 datasheet, ISL36111DRZ-T7 pinout, ISL36111DRZ-T7 application, or ISL36111DRZ-T7 equivalent, key selection criteria include its fixed 3mm×3mm 16-lead QFN package, support for NRZ data rates from 1 to 11.1 Gb/s, low latency (<500 ps), 110 mW typical power consumption, and line-silence preservation capability for protocol-compliant idle states.

Technical Context

The ISL36111DRZ-T7 implements a settable analog equalizer followed by a limiting amplifier to compensate for frequency-dependent channel loss-including skin and dielectric effects-without adaptive convergence delay. Its equalization boost level is statically configured via CP[A,B] pins, enabling deterministic first-bit response across 9 discrete settings.

It uses CML input/output buffers with 100 Ω differential input resistance and 105 Ω typical differential output impedance, supports DC-coupled operation with internal VDD biasing of inputs, and integrates a voltage-controlled signal detector that drives both LOSB assertion and output muting based on the DT pin reference threshold.

Key Specifications

Pinout & Package

ISL36111DRZ-T7 is housed in a 3 mm × 3 mm, 16-lead QFN package (L16.3x3B) with exposed thermal pad. The package is RoHS-compliant, Pb-free, and rated MSL3 per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar lane extender applications.

Compared with MAX3785ETE+ and DS100BR410, the ISL36111DRZ-T7 uniquely balances ultra-low latency (<500 ps), static configurability, line-silence preservation, and 1.2V operation-making it the preferred choice for space-constrained, protocol-sensitive active copper cable designs where deterministic behavior and minimal power are critical.

Availability

ISL36111DRZ-T7 is available at Aetrix Electronics and suitable for SFP+ active cable modules, QSFP interconnects, and 10G Ethernet backplane trace extension requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for ISL36111DRZ-T7 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

Renesas Electronics Corporation is a global leader in microcontrollers, analog, power, and connectivity solutions, serving automotive, industrial, infrastructure, and datacenter markets with high-reliability semiconductor products.

The ISL36111DRZ-T7 belongs to Renesas' Q:ACTIVE lane extender product line, engineered specifically to transform passive copper cabling into intelligent, reach-extended interconnects for next-generation datacenters-emphasizing low power, low latency, and protocol-aware signal integrity.

FAQ

What data rates does the ISL36111DRZ-T7 support?

The ISL36111DRZ-T7 supports NRZ data rates from 1 Gb/s up to 11.1 Gb/s, including 1, 2.5, 3.125, 4.25, 5, 6.25, 8.5, 10.3125, and 11.1 Gb/s. This broad range enables reuse across multiple standards-such as 1G/10G Ethernet, Fibre Channel, and InfiniBand-without redesign. All rates operate under the same 1.2V supply and pin configuration, with equalization optimized per channel via CP[A,B] settings.

How is equalization boost configured on the ISL36111DRZ-T7?

Equalization boost on the ISL36111DRZ-T7 is set statically using two external control pins: CPA (Pin 6, MSB) and CPB (Pin 7, LSB). Their connection states-float, GND, or VDD-define a 2-bit code selecting one of nine discrete boost levels (0–8), as specified in Table 1 of the FN6974 datasheet. No dynamic adaptation or software interface is required, ensuring immediate, deterministic performance from power-on.

Does the ISL36111DRZ-T7 preserve line silence during idle periods?

Yes, the ISL36111DRZ-T7 preserves line silence through hardware-based output muting triggered when the input signal amplitude falls below the threshold set by the DT pin voltage. This prevents distortion of DC-idle states required by protocols like IEEE 802.3ae and Fibre Channel, distinguishing it from conventional limiting amplifiers that disrupt quiescent signaling.

What is the function of the LOSB pin on the ISL36111DRZ-T7?

The LOSB (Pin 4) is an active-low Loss-of-Signal indicator output. It asserts LOW when the internal signal detector determines the input has fallen below the DT-defined threshold, and remains HIGH otherwise. Internally pulled up with an 11 kΩ resistor, LOSB provides a standardized interface for host controllers in SFP+/QSFP modules to monitor link health without additional circuitry.

What package type and thermal characteristics apply to the ISL36111DRZ-T7?

The ISL36111DRZ-T7 uses a 3 mm × 3 mm, 16-lead QFN package (L16.3x3B) with exposed thermal pad. Its thermal resistance is θ_JA = 56°C/W and θ_JC = 10°C/W. The exposed pad must be soldered to the PCB ground plane for optimal electrical performance and thermal dissipation, supporting continuous operation at up to +85°C ambient with typical 110 mW power draw.