Texas Instruments TSB43AB22APDT

Overview

TSB43AB22APDT from Texas Instruments is a PCI-based 1394a-2000 OHCI-compliant PHY/link-layer controller IC supporting 100/200/400 Mbit/s data rates, dual 1394 ports with independent TPBIAS, and full IEEE 1394-1995/1394a-2000 compliance. It integrates PCI bus mastering, deep FIFO buffering, SBP-2-optimized physical write posting, and hardware-accelerated isochronous DV/MPEG timestamping for digital video host systems.

For engineers reviewing the TSB43AB22APDT datasheet, TSB43AB22APDT pinout, TSB43AB22APDT application, or TSB43AB22APDT equivalent, key selection criteria include PCI 33 MHz timing compliance, dual-port 1394a arbitration support, S400 PHY performance, OHCI register mapping (OHCI offset 50h/54h LPS control), and TI-specific isochronous enhancements at A88h.

Technical Context

The TSB43AB22APDT implements a tightly coupled PHY+LLC architecture with an internal 24.576 MHz crystal-driven PLL generating 393.216 MHz reference and 49.152 MHz LLC clock. Its dual-port PHY includes independent TPBIAS circuits (1.86 V nominal), differential TPA/TPB transceivers, and line-state monitoring comparators for arbitration and connection detection.

It supports PCI power states D0–D3, automatic ultralow-power sleep mode on port inactivity, and hardware-assisted isochronous context management-including CIP header stripping and synchronization timestamp insertion for DV/MPEG streams per IEC 61883-1:1998-via dedicated TI extension registers at OHCI offset A88h.

Key Specifications

Pinout & Package

TSB43AB22APDT is housed in a 128-pin TQFP (Thin Quad Flat Package) with 0.4 mm pitch, thermally enhanced for sustained PCI bus mastering operation. Pin assignments are defined per Figure 2–1 and Tables 2–1 through 2–8 of the SLLS520 data manual.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSB43AB22APDT, the TSB43AB21APDT sacrifices port count for lower cost and power, while the VT6306-LE trades TI-specific isochronous acceleration for broader third-party driver support-making TSB43AB22APDT optimal for dual-port, DV-centric designs requiring minimal CPU intervention.

Availability

TSB43AB22APDT is available at Aetrix Electronics and suitable for digital video capture systems, PCI-based 1394 expansion cards, and industrial machine vision nodes requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TSB43AB22APDT 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 solutions with broad industrial and automotive reach.

The TSB43AB22APDT belongs to TI's 1394 Host Controller Solutions product line, designed specifically to enable high-bandwidth, low-latency IEEE 1394a connectivity in PCI-based host systems with emphasis on digital video and storage applications.

FAQ

What is the primary function of the TSB43AB22APDT in a system?

The TSB43AB22APDT serves as a PCI-based OHCI-compliant 1394a-2000 PHY/link-layer controller, bridging the 33 MHz PCI bus to dual 1394 cable ports at up to 400 Mbit/s. It handles physical layer signaling, link-layer protocol, bus arbitration, and isochronous data acceleration-enabling direct integration of IEEE 1394 peripherals into host systems without external PHY or LLC components. The TSB43AB22APDT manages all OHCI register interactions, power state transitions, and hardware timestamping for DV/MPEG streams.

Does the TSB43AB22APDT require an external crystal, and what are the alternatives?

Yes, the TSB43AB22APDT requires a 24.576 MHz external crystal or clock source to drive its internal PLL, which generates the 49.152 MHz LLC clock and 393.216 MHz PHY reference. An external clock may be applied directly to the CLKIN pin instead of a crystal, bypassing the internal oscillator but retaining full PLL functionality and timing accuracy. The TSB43AB22APDT does not operate without this reference; no internal RC oscillator is provided.

How does the TSB43AB22APDT support power efficiency in portable applications?

The TSB43AB22APDT supports PCI D0–D3 power states and implements automatic ultralow-power sleep mode when all ports are inactive (disconnected, disabled, or suspended). In this mode, internal clock generators and non-essential reference circuits are disabled-reducing current draw significantly-while retaining enough bias detection circuitry to sense incoming TPBIAS or port events. Wake-up occurs within 2 ms after setting bit 19 (LPS) in the Host Controller Control Register (OHCI offset 50h/54h), making the TSB43AB22APDT suitable for battery-powered 1394 host adapters.

What is the role of the R0 and R1 pins on the TSB43AB22APDT?

The R0 and R1 pins on the TSB43AB22APDT accept a precision 6.34 kΩ ±1% resistor that sets the driver output current and internal bias currents for both 1394 ports. This calibration ensures compliant signal amplitude, rise/fall times, and impedance matching to the 110 Ω twisted-pair cable-critical for meeting IEEE 1394a-2000 electrical specifications. Deviation beyond ±1% risks noncompliant eye diagrams or inter-port crosstalk, so the resistor must be placed close to the device with minimal trace length.

Can the TSB43AB22APDT be used in systems requiring IEC 61883-1:1998 compliance for digital video?

Yes, the TSB43AB22APDT provides hardware-level support for IEC 61883-1:1998 via its TI extension registers, particularly the isochronous receive digital video enhancements register at OHCI offset A88h. This enables automatic CIP header stripping on received DV streams and synchronization timestamp insertion on transmitted DV/MPEG packets-both required for standards-compliant digital video transport. These functions are implemented in silicon, eliminating software overhead and ensuring deterministic timing essential for broadcast-grade video workflows using the TSB43AB22APDT.