Texas Instruments TSB43AB21PDT

Overview

TSB43AB21PDT from Texas Instruments is a single-port 1394a-2000 OHCI-compliant PHY/link-layer controller IC integrating PCI bus interface (33 MHz), IEEE 1394 physical layer, and Open Host Controller Interface logic. It supports 100/200/400 Mbit/s data rates, provides D0–D3 power states per PCI PM 1.1, and delivers 132 MB/s burst throughput to memory via PCI bus mastering. It is used in desktop PCs, digital camcorders, and external storage subsystems requiring FireWire connectivity.

For engineers reviewing the TSB43AB21PDT datasheet, TSB43AB21PDT pinout, TSB43AB21PDT application, or TSB43AB21PDT equivalent, key selection criteria include OHCI register compatibility, S400 PHY timing compliance, PCI configuration space mapping, and TI-specific extension register support for DV timestamping and isochronous receive enhancements.

Technical Context

The TSB43AB21PDT implements a fully integrated 1394a-2000 node with on-die PHY transceivers for TP-A/TP-B differential signaling and an embedded link-layer controller compliant with OHCI Release 1.1. Its PCI interface supports non-prefetchable memory-mapped registers, plug-and-play enumeration, and full D0–D3 power state transitions per PC 2001 requirements.

Internally, it uses a 24.576 MHz crystal (or external clock) to generate a 393.216 MHz PLL reference, internally divided to produce 49.152 MHz for LLC synchronization and resampling of received data. Transmit encoding and receive decoding are handled entirely in hardware, with dedicated isochronous context control registers supporting multiple concurrent streams.

Key Specifications

Pinout & Package

TSB43AB21PDT is housed in a 128-pin LQFP (Low-Profile Quad Flat Package) with 0.4 mm pitch, measuring 14 mm × 20 mm. The package supports standard reflow soldering and provides thermal pad grounding for enhanced power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSB43AB21PDT, the TSB43AB22PDT offers native dual-port expansion at identical power/performance, while the TSB41AB2 sacrifices OHCI compliance for greater PHY-level control-making TSB43AB21PDT optimal for standards-based, driver-supported FireWire host implementations.

Availability

TSB43AB21PDT is available at Aetrix Electronics and suitable for digital video capture systems, external storage subsystems, and industrial machine vision interfaces requiring stable component supply and long-term FireWire 400 interoperability.

Supply support for TSB43AB21PDT 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 specializing in analog, embedded processing, and connectivity solutions, with leadership in industrial, automotive, and communications markets.

The TSB43AB21PDT belongs to TI's 1394 Host Controller Solutions product line, designed specifically to enable standards-compliant, low-power, high-reliability FireWire connectivity in PC add-in cards and embedded host systems.

FAQ

What is the primary function of the TSB43AB21PDT in a FireWire system?

The TSB43AB21PDT serves as a complete single-port IEEE 1394a-2000 host controller, integrating both PHY transceiver and OHCI-compliant link-layer logic. It bridges the PCI bus to the 1394 cable network, handling physical signaling (S100/S200/S400), isochronous resource arbitration, cycle timer synchronization, and DMA-based data movement - all within one IC. This eliminates external glue logic and enables direct OS driver support via standard PCI enumeration.

Does the TSB43AB21PDT require an external crystal, and what frequency is needed?

Yes, the TSB43AB21PDT requires a 24.576 MHz fundamental-mode crystal connected to XTAL_IN/XTAL_OUT pins. This frequency is mandatory to generate the precise 393.216 MHz internal reference clock needed for S400 (400 Mbit/s) timing compliance per IEEE 1394a-2000. An external 24.576 MHz clock source may substitute the crystal, but deviation beyond ±100 ppm invalidates S400 operation.

How does the TSB43AB21PDT handle power management in portable systems?

The TSB43AB21PDT fully implements PCI Bus Power Management Interface Specification Revision 1.1, supporting D0 (active), D1/D2 (intermediate sleep), and D3 (off) states. In D3cold, supply current drops below 100 µA, and the device retains no configuration state. Wake-on-1394 events (e.g., bus reset, PHY activity) can trigger D3→D0 transition. This behavior meets PC 2001 Design Guide requirements for battery-operated notebooks and docking stations.

What are the key differences between TSB43AB21PDT and TSB43AB22PDT?

The TSB43AB22PDT is a functional superset of the TSB43AB21PDT, sharing identical OHCI register mapping, PCI interface, and S400 PHY performance - but adding a second independent 1394 port (TP-A/TP-B pair). Both use the same 128-pin LQFP package and pinout for shared signals, but TSB43AB22PDT dedicates additional pins to the second port's bias, termination, and control lines. No PCB redesign is needed to upgrade from TSB43AB21PDT to TSB43AB22PDT if second-port routing is pre-planned.

Can the TSB43AB21PDT be used with modern operating systems like Windows 10 or Linux kernel 5.x?

Yes, the TSB43AB21PDT is supported natively in Windows 10 via the built-in ieee1394.sys driver stack and in Linux kernels ≥2.6.37 via firewire-ohci and firewire-core modules. Its strict OHCI Release 1.1 compliance ensures correct enumeration, isochronous channel setup, and SBP-2 mass-storage protocol handling. Driver certification was completed by TI in 2003–2005, and no firmware updates are required for OS compatibility.