Texas Instruments TSB43AB22APDTG4

Overview

TSB43AB22APDTG4 from Texas Instruments is a PCI-based 1394a-2000 OHCI-compliant PHY/link-layer controller IC supporting 100/200/400 Mbps FireWire data transfer across two independent twisted-pair ports with integrated TPBIAS, 24.576 MHz crystal reference, and SBP-2-optimized physical write posting buffers. It operates at 33 MHz PCI clock, delivers up to 132 MB/s burst throughput, and implements IEEE 1394a power-down for battery-powered host systems.

For engineers reviewing the TSB43AB22APDTG4 datasheet, TSB43AB22APDTG4 pinout, TSB43AB22APDTG4 application, or TSB43AB22APDTG4 equivalent, key selection criteria include dual-port 1394a PHY integration, OHCI register compatibility (PCI configuration space + OHCI offset mapping), S400 timing compliance, low-power D0–D3 state support, and TI-specific DV/MPEG timestamp enhancements at OHCI offset A88h.

Technical Context

The TSB43AB22APDTG4 integrates a full 1394a PHY layer and OHCI-compliant link-layer controller on a single die, enabling direct connection between a 33-MHz PCI bus and IEEE 1394 cable networks. Its architecture includes dual independent TPBIAS circuits, internal PLL generating 393.216 MHz reference from 24.576 MHz crystal, and 49.152 MHz system clock for LLC synchronization.

It implements hardware-accelerated isochronous context management with multiple transmit/receive contexts, automatic CIP header stripping for DV streams, and timestamp insertion for DV/MPEG packets via TI Extension Register at OHCI offset A88h - all compliant with IEC 61883-1:1998. Power management follows PCI Bus Power Management Interface Specification with D0–D3 states and ultralow-power sleep mode triggered by port inactivity.

Key Specifications

Pinout & Package

TSB43AB22APDTG4 is housed in a 128-pin TQFP (Thin Quad Flat Package) with 0.4 mm pitch, thermally enhanced for sustained PCI bus-master operation. Pin assignments follow JEDEC MO-152AC, with dedicated PCI address/data/control, dual 1394 PHY I/O (TPA/TPB pairs), TPBIAS outputs, and power/ground distribution optimized for EMI control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSB43AB22APDTG4, TSB43AB21APDT offers lower integration and reduced feature set for single-port use, while VT6306-LE provides functional equivalence at S400 but requires driver rework and forfeits hardware-accelerated DV timestamping and CIP handling.

Availability

TSB43AB22APDTG4 is available at Aetrix Electronics and suitable for professional video capture systems, external RAID enclosures, digital camcorder docking stations, and industrial machine vision systems requiring stable component supply and long-term FireWire interface continuity.

Supply support for TSB43AB22APDTG4 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 portfolio coverage.

The TSB43AB22APDTG4 belongs to TI's 1394 Host Controller Solutions product line, designed specifically to enable robust, standards-compliant FireWire connectivity in PCI-based host systems with emphasis on low-power operation and real-time isochronous performance.

FAQ

What is the primary function of the TSB43AB22APDTG4 in a system architecture?

The TSB43AB22APDTG4 serves as a PCI-to-IEEE 1394a bridge, integrating both PHY and OHCI-compliant link-layer controller functions. It enables host systems to communicate with FireWire peripherals at 100/200/400 Mbps through two independent ports. The TSB43AB22APDTG4 handles physical layer signaling, arbitration, isochronous context management, and PCI bus mastering - eliminating need for discrete PHY or software-only OHCI implementations.

Does the TSB43AB22APDTG4 support S400 (400 Mbps) operation, and what are the electrical requirements?

Yes, the TSB43AB22APDTG4 fully supports IEEE 1394a S400 operation on both ports. It requires a 24.576 MHz crystal (or equivalent clock source) to generate the internal 393.216 MHz reference. Each port uses differential TPA/TPB signaling with 112 Ω external termination networks and 1.86 V TPBIAS outputs stabilized by 1.0 µF capacitors. Driver current is set by a 6.34 kΩ ±1% resistor between R0 and R1 terminals.

How does the TSB43AB22APDTG4 implement power management for battery-operated devices?

The TSB43AB22APDTG4 complies with PCI Bus Power Management Interface Specification and supports D0–D3 power states. In D2/D3, it automatically enters ultralow-power sleep mode if all ports are inactive - disabling internal clocks and reference circuits while retaining TPBIAS monitoring capability. Wake-up occurs within 2 ms upon setting LPS bit (OHCI offset 50h/54h) or detecting cable events like connection/disconnection. This enables extended battery life in portable FireWire hosts.

What hardware enhancements does the TSB43AB22APDTG4 provide for digital video applications?

The TSB43AB22APDTG4 includes TI-specific isochronous enhancements accessible via OHCI offset A88h register: automatic insertion of IEC 61883-1 synchronization timestamps into transmitted DV/MPEG packets, and hardware stripping of CIP headers from received DV streams. These features reduce CPU overhead in video capture/playback systems by offloading timestamp generation and packet parsing to dedicated logic inside the TSB43AB22APDTG4.

Is the TSB43AB22APDTG4 pin-compatible with other TI 1394 controllers such as the TSB43AB21?

No, the TSB43AB22APDTG4 is not pin-compatible with the TSB43AB21APDT. While both use 128-pin TQFP packages, the TSB43AB22APDTG4 allocates pins for dual TPBIAS outputs, second port PHY signals (TPA1/TPB1), and additional control logic - resulting in distinct pin mappings. Migration requires PCB layout revision and firmware adaptation due to differences in register access, interrupt handling, and feature enablement sequences.