Analog Devices Inc./Maxim Integrated MAX3751CEE

Overview

MAX3751CEE from Maxim Integrated is a +3.3V Fibre Channel port bypass IC optimized for 1.0625Gbps arbitrated loop (FC-AL) topologies, featuring 10ps peak-to-peak deterministic jitter, 180mW total power consumption (including output currents), and integrated 150Ω differential on-chip termination on all inputs and outputs. It enables hot-swap capability for storage devices in RAID/JBOD systems.

For engineers reviewing the MAX3751CEE datasheet, MAX3751CEE pinout, MAX3751CEE application, or MAX3751CEE equivalent, key selection criteria include FC-AL signal integrity at 1.0625Gbps, mismatch-tolerant output driver behavior, on-chip back-termination for LOUT±/OUT±, and QSOP-16 thermal/power constraints in cascaded loop configurations.

Technical Context

The MAX3751CEE implements a TTL-controlled 2:1 multiplexer routing either LIN± (port input) or IN± (device input) to OUT± and LOUT± outputs, with SEL logic determining path selection. Its output buffer stage supports >1000mV_p-p differential swing into 150Ω loads while tolerating board-level impedance discontinuities from vias and connectors.

Internally terminated 150Ω differential inputs (LIN±, IN±) and back-terminated 150Ω outputs (LOUT±, OUT±) eliminate external resistors and reduce layout sensitivity. Low-frequency cutoff is set by external AC-coupling capacitors (e.g., 100nF) and internal 150Ω input resistance, yielding ~10kHz corner frequency.

Key Specifications

Pinout & Package

MAX3751CEE is housed in a 16-pin QSOP package with exposed pad (not thermally enhanced), measuring 10.1mm × 5.4mm × 1.75mm. Pin pitch is 0.635mm. GND pins (1, 4, 5, 8, 16) provide low-inductance return paths for high-speed signaling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Fibre Channel port bypass applications.

Compared with MAX3750CEE and SY88932LMB, the MAX3751CEE delivers optimal trade-off for 1.0625Gbps FC-AL: lowest power (180mW), guaranteed 150Ω on-chip termination, and validated hot-swap behavior-making it the preferred choice for commercial RAID/JBOD implementations where power and layout simplicity are prioritized over 2x speed headroom.

Availability

MAX3751CEE is available at Aetrix Electronics and suitable for Fibre Channel arbitrated loop infrastructure, RAID controller bypass nodes, and mass storage hot-swap modules requiring stable component supply across industrial temperature variations and long production lifecycles.

Supply support for MAX3751CEE 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and high-speed interface ICs for industrial, communications, and computing applications.

The MAX3750/MAX3751 product line was engineered specifically for Fibre Channel arbitrated loop port bypass functionality-delivering low-jitter, hot-swap–capable signal routing with integrated termination to simplify FC-AL storage subsystem design.

FAQ

What is the maximum data rate supported by the MAX3751CEE?

The MAX3751CEE supports a maximum data rate of 1.0625Gbps, compliant with the 1x Fibre Channel arbitrated loop (FC-AL) standard. This rate is fixed and cannot be configured higher; attempting to operate the MAX3751CEE above 1.0625Gbps violates its AC electrical specifications and may result in increased jitter or bit errors. The MAX3750CEE variant supports 2.125Gbps for 2x FC-AL applications.

Does the MAX3751CEE require external termination resistors?

No, the MAX3751CEE does not require external termination resistors. It integrates 150Ω differential on-chip termination on all inputs (LIN±, IN±) and 150Ω on-chip back-termination on all outputs (LOUT±, OUT±). This eliminates eight external resistors, reduces PCB area, and improves signal integrity repeatability compared to discrete termination solutions.

How does the SEL pin control signal routing in the MAX3751CEE?

The SEL pin on the MAX3751CEE is a TTL-compatible control input that selects the signal path: when SEL is logic low, the IN± inputs are routed to both OUT± and LOUT± outputs; when SEL is logic high, the LIN± inputs are routed instead. This enables dynamic bypass of attached storage devices without interrupting the FC-AL loop, a critical function for hot-swap capability.

What is the operating temperature range for the MAX3751CEE?

The MAX3751CEE is specified for operation from 0°C to +70°C, consistent with commercial-grade mass storage and RAID controller environments. While the absolute maximum ratings extend to -40°C to +85°C, full parametric performance-including jitter, power consumption, and output swing-is guaranteed only within the 0°C to +70°C range stated in the datasheet's DC and AC electrical characteristics tables.

Can the MAX3751CEE be used in cascaded FC-AL topologies?

Yes, the MAX3751CEE is explicitly designed for cascaded FC-AL topologies, as confirmed by the "Three MAX3750/MAX3751s Cascaded in an FC-AL Application" schematic in the datasheet. Its 10ps deterministic jitter and >1000mV_p-p output swing ensure signal integrity is maintained across multiple stages without violating FC-AL jitter budgets or receiver sensitivity thresholds.