Texas Instruments SN75FC1000BPJD

Overview

SN75FC1000BPJD 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 baseband transmission over copper or optical media, featuring PECL differential I/O (DIN_RXP/DIN_RXN, DOUT_TXP/DOUT_TXN), 5-V tolerant TTL/CMOS logic interfaces, and dual 53.125 MHz receive byte clocks (RBC0/RBC1). It is used in high-speed storage interconnects requiring deterministic latency and K28.5 comma-based word alignment.

For engineers reviewing the SN75FC1000BPJD datasheet, SN75FC1000BPJD pinout, SN75FC1000BPJD application, or SN75FC1000BPJD equivalent, key selection considerations include its 1.0625 Gbps serial data rate, 21 ns receive latency, 13 ns transmit latency, 200 mV minimum receiver differential input voltage, and support for internal loopback testing via LOOPEN - all critical for Fibre Channel physical layer design validation and timing-critical embedded storage systems.

Technical Context

The SN75FC1000BPJD integrates a PLL-based clock recovery circuit that locks to incoming 1.0625 Gbps serial data without external reference, with optional lock-to-reference mode using 106.25 MHz REFCLK. Its receiver extracts clock and deserializes 8b/10b encoded data into aligned 10-bit parallel words synchronized to RBC0 and RBC1 - two 53.125 MHz clocks phase-shifted by 180° for half-word boundary registration.

The transmitter accepts 10-bit parallel data on TD0–TD9 at REFCLK's rising edge, multiplies REFCLK by 10 to generate 1.0625 Gbaud, and outputs NRZ differential signals at PECL levels (1.2–2.2 Vpp into 50–75 Ω). Internal loopback (LOOPEN) routes serialized output directly to receiver input for protocol-layer functional self-test without external media.

Key Specifications

Pinout & Package

SN75FC1000BPJD uses a 64-pin PowerPAD™ Plastic Quad Flatpack (PJD) package - 10 mm × 10 mm, 1.20 mm max height, with exposed thermal pad electrically connected to die backside. Thermal resistance θ_JA = 40°C/W enables stable operation under sustained 1.0625 Gbps traffic without external heatsink in well-ventilated designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN75FC1000BPJD, SN65LVDS100PJD offers higher raw speed but requires external logic for Fibre Channel compliance, while DS21QX55A targets telecom framing - neither provides the integrated K28.5 alignment, dual-byte clocks, or internal loopback essential for drop-in 1GFC physical layer implementation.

Availability

SN75FC1000BPJD is available at Aetrix Electronics and suitable for Fibre Channel storage controllers, RAID array interconnects, and optical transceiver modules requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and enterprise applications.

Supply support for SN75FC1000BPJD 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN75FC1000BPJD belongs to TI's Fibre Channel physical layer product line, designed specifically to enable ANSI X3T11-compliant 1GFC interconnects in storage subsystems, network switches, and test equipment - emphasizing low-latency SERDES, robust clock recovery, and protocol-aware alignment.

FAQ

What is the primary function of the SN75FC1000BPJD in a Fibre Channel system?

The SN75FC1000BPJD serves as a complete 1.0625 Gbps Fibre Channel physical layer transceiver, performing serialization of 10-bit parallel data (TD0–TD9) and deserialization of incoming serial streams (DIN_RXP/DIN_RXN) while maintaining ANSI X3T11 FC-PH-0 compliance. It delivers aligned 10-bit parallel output (RD0–RD9) synchronized to dual 53.125 MHz byte clocks (RBC0/RBC1) and supports K28.5 comma-based word alignment - making it central to reliable, low-latency storage interconnects. The SN75FC1000BPJD eliminates need for discrete clock recovery or framing logic in 1GFC designs.

Does the SN75FC1000BPJD require an external reference clock to operate?

The SN75FC1000BPJD does not require an external reference clock for normal operation: its receiver PLL automatically locks to incoming 1.0625 Gbps serial data without pre-locking. However, REFCLK (106.25 MHz) is mandatory for transmitter operation - it clocks TD0–TD9 into the serializer and serves as a PLL preset when LCKREFN is asserted. REFCLK must be crystal-referenced to meet ±100 ppm accuracy and ≤40 ps jitter specs. The SN75FC1000BPJD thus supports both autonomous receive lock and synchronized transmit timing.

How does the internal loopback mode work on the SN75FC1000BPJD?

When LOOPEN is driven high, the SN75FC1000BPJD activates an internal loopback path that routes serialized transmit data directly to the receiver input stage - bypassing DOUT_TXP/DOUT_TXN and DIN_RXP/DIN_RXN pins. During loopback, DOUT_TXP/DOUT_TXN are held static, RD0–RD9 reflect deserialized looped-back data, and RBC0/RBC1 remain active. This allows protocol-layer software to verify SERDES functionality end-to-end without external cabling or optical modules. The SN75FC1000BPJD's loopback is fully synchronous and preserves timing relationships for accurate functional validation.

What are the power supply requirements for the SN75FC1000BPJD?

The SN75FC1000BPJD requires five independent supply rails: VCC_A (analog core, 3.3 V), VCC_TX (transmitter analog, 3.3 V), VCC_RX (receiver analog, 3.3 V), VCC_CMOS (digital logic, 3.3 V), and VCC_TTL (TTL interface, 3.3 V). Each has dedicated pins and ground returns (GND_A, GND_TX, GND_RX, GND_CMOS, GND_TTL) to isolate noise. Total static current is 160–250 mA; dynamic current reaches 230–310 mA during K28.5 transmission. The SN75FC1000BPJD's split-supply architecture prevents switching noise from degrading high-speed analog performance.

Can the SN75FC1000BPJD interface directly with 5-V logic devices?

Yes - the SN75FC1000BPJD's TTL/CMOS inputs (TD0–TD9, REFCLK, SYNCEN, LCKREFN, etc.) are explicitly rated for 5-V tolerance, accepting input voltages up to 5.5 V. Its outputs (RD0–RD9, RBC0, RBC1, SYNC) drive standard TTL levels (VOH ≥ 2.4 V, VOL ≤ 0.4 V at 1 mA load) compatible with 5-V receivers. This allows direct connection to legacy 5-V microcontrollers or FPGAs without level-shifting circuitry. The SN75FC1000BPJD maintains this compatibility while operating from a 3.3-V supply, simplifying mixed-voltage system integration.