Texas Instruments PCI2050BIZWT

Overview

PCI2050BIZWT from Texas Instruments is a PCI-to-PCI bridge IC enabling hierarchical expansion of 32-bit, 66-MHz PCI buses with dual-bus concurrency, write combining, and CompactPCI hot-swap support - deployed in industrial backplane systems requiring electrical load isolation and bus segmentation.

For engineers reviewing the PCI2050BIZWT datasheet, PCI2050BIZWT pinout, PCI2050BIZWT application, or PCI2050BIZWT equivalent, key selection criteria include 66-MHz timing compliance, secondary bus arbitration for up to nine masters, JTAG boundary-scan testability, and RoHS-compliant 257-pin MicroStar BGA packaging.

Technical Context

The PCI2050BIZWT implements a two-tier arbitration architecture supporting up to nine secondary bus masters internally while allowing external arbiter integration. It enforces strict PCI Local Bus Specification Rev 2.2 and PCI-to-PCI Bridge Spec Rev 1.1 compliance, including Type 0/Type 1 configuration cycles, posted write handling, and SERR/PERR error reporting.

Its dual-bus pipeline supports concurrent primary-to-secondary and secondary-to-primary transactions with frame-to-frame latency of only four PCI clocks. Power management follows PCI Bus Power Management Interface Spec Rev 1.1, with D0–D3hot states and PMCSR register control.

Key Specifications

Pinout & Package

PCI2050BIZWT is housed in a 257-terminal RoHS-compliant ZHK MicroStar BGA package (mechanically identical to GHK, with lead-free finish). Pin functions are defined per Table 2−3 (GHK/ZHK Signal Names Sorted Alphabetically) and Figures 2−1 and 2−3 in the SCPS076G data manual.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCI-to-PCI bridge applications.

Compared with PCI2050BIZWT, PCI2050BGHK offers identical electrical and functional behavior but lacks RoHS compliance, while PCI2050BIPDV trades BGA density and full 10-clock fanout for QFP manufacturability and reduced secondary clock count - making PCI2050BIZWT the optimal choice for new RoHS-compliant CompactPCI designs requiring full hot-swap and clock distribution capability.

Availability

PCI2050BIZWT is available at Aetrix Electronics and suitable for industrial backplane systems, CompactPCI hot-swap modules, and legacy PCI upgrade projects requiring stable component supply across extended product lifecycles.

Supply support for PCI2050BIZWT 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 for industrial, automotive, and communications markets.

The PCI2050BIZWT belongs to TI's Connectivity Solutions portfolio, designed specifically to extend PCI system scalability, overcome electrical loading limits, and enable robust hot-swap capability in ruggedized computing platforms.

FAQ

What is the operating temperature range for the PCI2050BIZWT?

The PCI2050BIZWT is rated for industrial operation from −40°C to +85°C. This range is validated per the recommended operating conditions in Section 6.2 of the SCPS076G data manual and applies to all electrical characteristics, including 66-MHz timing margins and hot-swap control logic stability. The device maintains full PCI specification compliance across this entire range.

Does the PCI2050BIZWT support both 33-MHz and 66-MHz PCI bus speeds?

Yes, the PCI2050BIZWT supports both 33-MHz and 66-MHz operation on primary and secondary buses independently. Its P_M66ENA and S_M66ENA pins enable 66-MHz mode per bus, and AC timing parameters (Section 6.4–6.5 of SCPS076G) are fully specified for both frequencies. The bridge automatically adapts to the clock frequency present on each bus domain.

How many secondary PCI clock outputs does the PCI2050BIZWT provide?

The PCI2050BIZWT provides ten dedicated secondary PCI clock outputs (S_CLKOUT0 through S_CLKOUT9), each capable of driving one CompactPCI slot. These outputs are individually maskable via the Secondary Clock Control Register (Section 5.8), and their phase alignment and jitter performance meet PICMG CompactPCI Hot-Swap Specification requirements.

Is the PCI2050BIZWT pin-compatible with other members of the PCI2050B family?

PCI2050BIZWT shares identical pinout and signal mapping with PCI2050BGHK (same 257-pin ZHK/GHK BGA footprint), but is not pin-compatible with PDV or PPM QFP variants due to differing package geometry and terminal count. Migration between ZHK and GHK requires only solder paste and reflow process adjustment - no PCB redesign.

What hot-swap functionality does the PCI2050BIZWT implement per PICMG specification?

The PCI2050BIZWT implements full PICMG CompactPCI Hot-Swap Specification Rev 1.0 functionality, including HSENUM (hot-swap enumeration enable), HSLED (status LED control), and HSSWITCH/GPIO3 (card presence detection). It supports power fault detection, controlled power-up sequencing, and SERR-driven error reporting during insertion/removal events - all handled in hardware without host CPU intervention.