Texas Instruments TSB43AB23IPDTEP

Overview

TSB43AB23IPDTEP from Texas Instruments is a PCI-based 1394a-2000 OHCI-compliant PHY/link-layer controller IC integrating three IEEE 1394 cable ports, supporting S100/S200/S400 data rates (100/200/400 Mbits/s), 33-MHz PCI bus interface, and D0–D3 power states for portable systems. It serves as the host-side 1394 interface bridge in desktop add-in cards, digital camcorder docking stations, and professional audio/video capture systems.

For engineers reviewing the TSB43AB23IPDTEP datasheet, TSB43AB23IPDTEP pinout, TSB43AB23IPDTEP application, or TSB43AB23IPDTEP equivalent, key selection criteria include OHCI register compatibility, triple-port PHY arbitration behavior, SBP-2 write-posting buffer support, and 24.576-MHz crystal-synchronized timing architecture.

Technical Context

The TSB43AB23IPDTEP implements a dual-domain architecture: a PCI bus master interface with non-prefetchable memory-mapped OHCI registers (per Release 1.1), and a three-port 1394a PHY with independent TPBIAS circuits, differential TPA/TPB transceivers, and internal PLL generating 393.216 MHz and 49.152 MHz clocks. It supports IEEE 1394a arbitration enhancements and power-down modes for battery operation.

Its physical layer includes line-state monitoring comparators on both TPA and TPB for connection detection and speed negotiation, plus integrated resynchronization logic that recovers receive clock from encoded strobe/data and aligns serial data to the local 49.152-MHz system clock before forwarding to the LLC. Driver output current is set by an external 6.34 kΩ ±1% resistor connected between R0 and R1 terminals.

Key Specifications

Pinout & Package

The TSB43AB23IPDTEP is housed in a 128-pin PowerPAD™ thermally enhanced TQFP package (PDT suffix), with exposed thermal pad for improved heat dissipation in high-throughput 1394 applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1394 OHCI controller applications.

Compared with TSB43AB22IPDTEP and VT6306-LF, the TSB43AB23IPDTEP uniquely delivers triple-port arbitration independence, TI-extended DV timestamping, and SBP-2-optimized physical write posting-making it the only choice for high-bandwidth, multi-stream 1394a host designs requiring minimal driver divergence.

Availability

TSB43AB23IPDTEP is available at Aetrix Electronics and suitable for digital video capture systems, professional audio interfaces, and desktop FireWire add-in cards requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and broadcast OEM programs.

Supply support for TSB43AB23IPDTEP 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 focused on analog, embedded processing, and connectivity technologies, with leadership in industrial, automotive, and communications infrastructure markets.

The TSB43AB23IPDTEP belongs to TI's 1394 Host Controller Solutions product line, designed specifically to enable robust, standards-compliant FireWire connectivity in PC add-in cards, docking stations, and professional media equipment.

FAQ

What is the primary function of the TSB43AB23IPDTEP in a system architecture?

The TSB43AB23IPDTEP functions as a PCI-based IEEE 1394a-2000 OHCI-compliant host controller, bridging the 33-MHz PCI bus to three independent 1394 cable ports. It handles physical layer signaling (S100/S200/S400), link-layer protocol processing, OHCI register management, and isochronous context arbitration-enabling real-time DV, audio, and storage traffic without CPU intervention. Its design centers on minimizing latency and maximizing interoperability in professional media systems.

Does the TSB43AB23IPDTEP require an external crystal, and what are the timing implications?

Yes, the TSB43AB23IPDTEP requires a 24.576-MHz external crystal (or clock source) to drive its internal PLL, which generates the 393.216-MHz reference and 49.152-MHz system clock. This precise frequency ensures accurate 1394 symbol timing and enables seamless resynchronization of received data to the local clock domain-critical for jitter-sensitive isochronous applications like digital video capture. Deviation beyond ±100 ppm risks link instability.

How does the TSB43AB23IPDTEP manage power in portable applications?

The TSB43AB23IPDTEP supports PCI D0–D3 power states and implements IEEE 1394a-2000 power-down features. When all three ports are inactive (disconnected, disabled, or suspended), the device automatically enters a low-power mode-shutting down unused PHY circuitry while retaining OHCI register state. This reduces quiescent current significantly, extending battery life in laptop docking stations and portable media hubs without compromising hot-plug readiness.

What is the role of the R0 and R1 pins on the TSB43AB23IPDTEP?

The R0 and R1 pins on the TSB43AB23IPDTEP serve as terminals for an external 6.34 kΩ ±1% precision resistor that sets the PHY driver output current and internal bias currents. This resistor directly determines slew rate, signal integrity, and compliance with IEEE 1394 electrical specifications across all three ports. Incorrect value or tolerance causes marginal eye diagrams, increased bit error rate, or failure to meet S400 timing margins.

Can the TSB43AB23IPDTEP be used in systems requiring SBP-2 (SCSI over 1394) storage protocols?

Yes, the TSB43AB23IPDTEP is explicitly optimized for SBP-2 performance through dedicated physical write-posting buffers and a highly tuned data path between the PCI interface and PHY layer. Its deep FIFOs absorb PCI latency variations, and its burst-capable PCI master engine sustains >100 MB/s sustained throughput-meeting the demanding bandwidth and low-latency requirements of high-speed external RAID and disk array applications using SCSI-over-1394.