NXP Semiconductors MC92460ZU

Overview

MC92604ZU from Freescale Semiconductor is a dual-channel Gigabit Ethernet transceiver implementing both PCS and PMA layers per IEEE Std 802.3-2002, supporting 1.25 Gbaud full-duplex SerDes operation over backplane or cable, with GMII/TBI interface options and integrated 8B/10B encoding/decoding. It serves as a PHY-level interface between network processors (e.g., MPC8560) and physical media in high-density communications chassis.

For engineers reviewing the MC92604ZU datasheet, MC92604ZU pinout, MC92604ZU application, or MC92604ZU equivalent, key selection considerations include its dual independent SerDes channels, MDIO slave compliance, JTAG boundary scan support, selectable 1.25/0.625 Gbaud rates, and configurable redundancy mode for single-channel fault-tolerant links.

Technical Context

The MC92604ZU integrates two fully independent transceiver channels (A and B), each with source-synchronous parallel interfaces, on-chip 8B/10B encoder/decoder (bypassable in TBI mode), and clock recovery circuitry tolerant to ±250 ppm frequency offset. It supports both backplane (FR-4, up to 1.5 m) and coaxial cable (up to 10 m) media with 50/75 Ω termination.

Its architecture includes dual transmit/receive FIFOs, configurable link synchronization (Disparity-Based Word Sync), COMMA alignment modes, and IEEE 1149.1 JTAG test access alongside full-speed BIST with isolated loopback. The device operates with 1.8 V core, 3.3 V or 2.5 V I/O, and 1.8 V link supplies.

Key Specifications

Pinout & Package

MC92604ZU is housed in a JEDEC-standard 196-pin MAPBGA package with 15 mm × 15 mm body size and 1.0 mm ball pitch, optimized for high-channel-count board layouts in telecom and networking equipment.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Gigabit Ethernet SerDes applications.

Compared with BCM5461S and TI DP83865, the MC92604ZU uniquely delivers dual independent SerDes channels with IEEE 802.3-compliant PCS/PMA, built-in redundancy configuration, and backplane-optimized timing-making it irreplaceable for high-density chassis and fault-tolerant networking systems.

Availability

MC92604ZU is available at Aetrix Electronics and suitable for telecom line cards, network processor interfacing, redundant chassis links, and high-bandwidth backplane systems requiring stable component supply and long-term lifecycle support.

Supply support for MC92604ZU 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

Freescale Semiconductor (now part of NXP Semiconductors) was a leading designer of embedded processing and connectivity solutions for automotive, industrial, and networking markets.

The MC92604ZU belongs to Freescale's high-speed SerDes transceiver product line, engineered specifically for IEEE 802.3-compliant backplane and optical module interfacing in carrier-grade networking equipment.

FAQ

What is the primary function of the MC92604ZU in a networking system?

The MC92604ZU functions as a dual-channel Gigabit Ethernet transceiver implementing both the Physical Coding Sublayer (PCS) and Physical Medium Attachment (PMA) layers per IEEE 802.3-2002. It bridges parallel interfaces (GMII/TBI) from network processors like the MPC8560 to serial differential links for backplane or SFP module connectivity. Its role is to encode/decode, serialize/deserialize, recover clock, and manage link-level signaling-making the MC92604ZU essential for high-density, low-latency data transport in telecom chassis.

Does the MC92604ZU support JTAG boundary scan and built-in self-test?

Yes, the MC92604ZU fully implements IEEE Std 1149.1 JTAG boundary scan for board-level test and debug, with dedicated TCK, TMS, TDI, TDO, and TRST_B pins. It also includes full-speed built-in self-test (BIST) with isolated loopback modes that operate independently of live link traffic. These capabilities allow validation of transceiver functionality during manufacturing and field maintenance without disrupting system operation-critical for carrier-class reliability requirements of the MC92604ZU.

Can the MC92604ZU be used in single-channel redundant mode?

Yes, the MC92604ZU supports configurable redundancy mode where Channel A and Channel B are combined into a single logical transceiver with duplicated transmit and receive paths. This is enabled via XCVR_A_DISABLE and XCVR_B_DISABLE controls, allowing automatic failover without software intervention. In this mode, the MC92604ZU maintains full 1 Gbps throughput while delivering hardware-level fault tolerance-ideal for mission-critical routers and switches where uptime exceeds 99.999%.

What reference clock options does the MC92604ZU support?

The MC92604ZU accepts either an LVPECL differential reference clock (for low-jitter performance in high-speed backplane applications) or a single-ended LVTTL reference clock (for simplified integration with FPGA or microcontroller clocks). It also provides two buffered Ref Clock outputs for synchronizing associated logic. This dual-clock flexibility ensures robust timing alignment across heterogeneous system architectures using the MC92604ZU.

Is the MC92604ZU compatible with SFP modules and GBIC interfaces?

Yes, the MC92604ZU is explicitly designed to interface with GBIC and SFP modules via its differential XLINK/RLINK serial lanes, which comply with IEEE 802.3 1000BASE-X electrical specifications. Its 1.25 Gbaud rate, 8B/10B encoding, and hot-swap–capable receiver inputs match SFP MSA requirements. When paired with appropriate SFP cage and retimer circuitry, the MC92604ZU serves as the native PHY layer for fiber-optic uplinks-confirming full functional compatibility with industry-standard pluggable optics.