Texas Instruments SN75FC1000PJD

Overview

SN75FC1000PJD from Texas Instruments is a 1.0625 Gbps Fibre Channel transceiver IC compliant with ANSI X3T11 FC-PH-0 and supporting the 10-bit interface specification. It performs bidirectional SERDES for point-to-point data transmission over copper or optical media, operates at 3.3 V, features PECL differential I/O (DIN_RXP/DIN_RXN, DOUT_TXP/DOUT_TXN), and delivers 100 MBps bandwidth in storage area network (SAN) interconnects.

For engineers reviewing the SN75FC1000PJD datasheet, SN75FC1000PJD pinout, SN75FC1000PJD application, or SN75FC1000PJD equivalent, key selection considerations include its 64-pin HTQFP package with PowerPAD thermal enhancement, 53.125 MHz recovered byte clocks (RBC0/RBC1), 21 ns receive latency, 13 ns transmit latency, and support for 8b/10b encoded parallel-to-serial conversion with K28.5 comma alignment.

Technical Context

The SN75FC1000PJD integrates a PLL-based clock recovery circuit that locks to incoming 1.0625 Gbps serial data without external reference, or optionally to a 106.25 MHz REFCLK when LCKREFN is asserted. Its receiver extracts timing and deserializes data into aligned 10-bit words output on RD0–RD9 synchronized to two 180°-phase-shifted 53.125 MHz clocks (RBC0/RBC1).

The transmitter accepts 10-bit parallel data (TD0–TD9) on REFCLK rising edges, multiplies the clock by 10× to generate 1.0625 Gbaud NRZ serial output, and drives differential PECL signals with 1.2–2.2 Vpp swing into 50 Ω or 75 Ω loads. Internal loopback (LOOPEN) enables self-test by routing serialized output directly to the receiver path.

Key Specifications

Pinout & Package

SN75FC1000PJD uses a 64-pin HTQFP (PJD) package with exposed thermal pad (PowerPAD), JEDEC MS-026 compliant, 10 mm × 10 mm footprint, 1.20 mm max height, and 40°C/W junction-to-ambient thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN65LVDS100PJD and DS90CR285MTD, the SN75FC1000PJD uniquely integrates full Fibre Channel PHY functionality-including clock recovery, 8b/10b handling, K28.5 alignment, and dual-byte clocks-enabling direct drop-in replacement in legacy FC-1 designs without modifying host interface logic or timing constraints.

Availability

SN75FC1000PJD is available at Aetrix Electronics and suitable for Fibre Channel storage interconnects, server-to-switch SAN links, optical module interfaces, and embedded SAN controller PHY implementations requiring stable component supply across extended product lifecycles.

Supply support for SN75FC1000PJD 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in high-speed interface solutions.

The SN75FC1000PJD belongs to TI's Fibre Channel transceiver product line, designed specifically to enable cost-effective, standards-compliant 1x FC physical layer implementation in enterprise storage and server infrastructure.

FAQ

What is the primary function of the SN75FC1000PJD in a Fibre Channel system?

The SN75FC1000PJD serves as a complete physical layer transceiver, performing bidirectional serialization and deserialization of 10-bit parallel data at 1.0625 Gbps. It recovers clock from incoming serial streams, aligns data using K28.5 comma detection, and outputs synchronized parallel words on RD0–RD9 with RBC0/RBC1 clocks-enabling seamless integration with Fibre Channel protocol controllers without external SERDES or clock recovery ICs.

Does the SN75FC1000PJD require an external reference clock to operate?

The SN75FC1000PJD does not require an external reference clock for normal operation-it automatically locks to incoming 1.0625 Gbps serial data. However, REFCLK (106.25 MHz) is required when using LCKREFN for PLL preset or reset, and it clocks the TD0–TD9 parallel input. The device remains fully functional in standalone mode with only serial I/O and power applied.

How does the SN75FC1000PJD handle word alignment and synchronization?

The SN75FC1000PJD uses hardware-based K28.5 comma character detection to perform real-time 10-bit word alignment. When SYNCEN is high, it scans the serial stream for the 0011111010 pattern and adjusts RBC0/RBC1 timing to ensure RD0–RD9 outputs are byte-aligned. Misaligned commas trigger automatic 10-bit boundary shifts without data loss, and SYNC pulses indicate valid alignment events.

What are the thermal management requirements for the SN75FC1000PJD?

The SN75FC1000PJD in PJD package features a PowerPAD thermal pad that must be soldered to a large PCB copper pour for effective heat dissipation. With dynamic power up to 1085 mW, proper thermal design-including ≥4 cm² exposed copper connected to internal ground planes-is essential to maintain junction temperature below 125°C and achieve the rated 40°C/W θJA performance.

Is the SN75FC1000PJD still in production and supported by Texas Instruments?

No-the SN75FC1000PJD is marked OBSOLETE by Texas Instruments per official packaging information. While Aetrix Electronics maintains limited legacy inventory and offers lifecycle support, new designs should consider modern alternatives. TI no longer manufactures or warrants the SN75FC1000PJD, and technical documentation reflects 1998 revision status.