Analog Devices Inc./Maxim Integrated MAX3752CCM

Overview

MAX3752CCM from Maxim Integrated is a 3.3V quad-port Fibre Channel bypass IC with integrated clock and data recovery (CDR), supporting both 2.125Gbps and 1.063Gbps data rates. It implements four serially connected port bypass circuits (PBCs) and delivers >1000mV_p-p differential output swing into 150Ω, enabling hot-swappable L-Port connectivity in Fibre Channel Arbitrated Loop (FC-AL) storage arrays.

For engineers reviewing the MAX3752CCM datasheet, MAX3752CCM pinout, MAX3752CCM application, or MAX3752CCM equivalent, key selection criteria include CDR-enabled jitter tolerance (0.7 UI high-frequency), on-chip 75Ω termination at all ports, TTL-compatible select/enable controls (SEL1–SEL4, CDREN, LOCKEN), and TQFP-EP package thermal performance for dense storage hub designs.

Technical Context

The MAX3752CCM integrates a fully self-contained PLL-based CDR that locks without external reference clock and provides frequency lock indication via the LOCK pin. Its cascaded PBC architecture supports up to four L-Ports per device, with each port independently enabled or bypassed via dedicated TTL-select inputs (SEL1–SEL4).

Signal integrity is maintained through internal 75Ω differential input/output termination (150Ω total), eliminating external resistors for 75Ω transmission lines. The device operates across 0°C to +70°C with supply voltage from +3.0V to +3.6V and meets Fibre Channel jitter tolerance requirements at both 2.125Gbps and 1.063Gbps data rates.

Key Specifications

Pinout & Package

MAX3752CCM uses a 48-pin TQFP-EP (7mm × 7mm, 1.0mm height) with exposed pad soldered to ground for thermal management. Pin functions are validated per Maxim's Rev 3 datasheet (19-1702).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX3753CCM, the MAX3752CCM offers lower power consumption in CDR-enabled mode while maintaining identical jitter tolerance and port control features; versus SY88932LKC, it integrates full quad-port bypass logic and eliminates need for external GPIO and multiplexing circuitry in FC-AL hub designs.

Availability

MAX3752CCM is available at Aetrix Electronics and suitable for Fibre Channel storage array hubs, RAID controller interfaces, and disk enclosure backplanes requiring stable component supply across extended production lifecycles.

Supply support for MAX3752CCM 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 high-performance analog and mixed-signal ICs for communications, computing, and industrial applications.

The MAX3752CCM belongs to Maxim's Fibre Channel interface product line, engineered specifically for low-jitter, hot-swappable loop topology management in enterprise storage systems.

FAQ

What data rates does the MAX3752CCM support, and how is rate selection configured?

The MAX3752CCM supports both 2.125Gbps and 1.063Gbps Fibre Channel data rates. Rate selection is automatic and determined by input signal characteristics - no configuration pins or registers are required. The CDR adapts to either rate based on incoming data pattern and clock frequency, as verified in AC Electrical Characteristics tables for both speeds in the datasheet.

Does the MAX3752CCM require an external reference clock for CDR operation?

No, the MAX3752CCM does not require an external reference clock. Its fully integrated PLL-based CDR achieves frequency lock autonomously using only the incoming data stream. The LOCK pin provides a TTL-level indication of lock status, and CLKEN allows optional routing of the recovered clock to LOUT1± for test purposes - all without external timing components.

How is thermal management handled in the MAX3752CCM's TQFP-EP package?

The MAX3752CCM uses a 48-pin TQFP-EP package with an exposed pad that must be soldered to a grounded copper plane on the PCB. This connection provides the primary thermal path, reducing junction-to-board thermal resistance. At maximum operating temperature (+70°C ambient), the package supports continuous 2.125Gbps operation with ≤2W power dissipation, as specified in Absolute Maximum Ratings.

Can multiple MAX3752CCM devices be cascaded, and what is the inter-device propagation delay?

Yes, multiple MAX3752CCM devices can be cascaded by connecting the OUT± pins of one device directly to the IN± pins of the next. In bypass mode (CDREN = LOW), the IN± to OUT± propagation delay is 10ns; in normal mode with CDR enabled, it remains 10ns for the main path. This deterministic delay enables predictable loop timing across multi-device configurations without additional compensation.

What is the purpose of the CFP and CFM pins on the MAX3752CCM?

The CFP and CFM pins connect to an external 0.22µF capacitor that sets the loop filter characteristics of the integrated CDR PLL. This capacitor determines the PLL bandwidth, jitter transfer function, and lock acquisition behavior. The value is optimized for Fibre Channel jitter tolerance compliance - deviating from 0.22µF may degrade high-frequency jitter rejection or increase lock time beyond the specified 4.4ms.