Texas Instruments PCI2050BGHK

Overview

PCI2050BGHK 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. It features 3.3-V core logic with 5-V tolerant I/Os, ten secondary clock outputs, and internal two-tier arbitration for up to nine secondary bus masters - deployed in industrial control backplanes and multifunction CompactPCI cards.

For engineers reviewing the PCI2050BGHK datasheet, PCI2050BGHK pinout, PCI2050BGHK application, or PCI2050BGHK equivalent, this page delivers verified technical context, package-specific terminal mapping, real-world use scenarios, and validated alternative options for PCI bus segmentation and legacy system extension.

Technical Context

The PCI2050BGHK implements a compliant PCI-to-PCI Bridge Specification (Rev 1.1) architecture with independent read/write buffers, burst-mode pipelining, and frame-to-frame latency of only four PCI clocks. It supports Type 0/Type 1 configuration cycles, posted writes with parity error reporting, and delayed transactions (up to three per direction).

Its dual-bus arbitration includes primary bus request/grant logic and configurable internal/external secondary bus arbitration. Secondary clock generation supports ten outputs with maskable enable, while JTAG boundary-scan (IEEE 1149.1) and GPIO interface provide debug and system control capabilities.

Key Specifications

Pinout & Package

The PCI2050BGHK is housed in a 257-terminal MicroStar BGA™ package (GHK variant), RoHS-compliant ZHK variant also available. This fine-pitch ball grid array supports high-density PCB layouts typical of CompactPCI carrier boards and embedded backplane designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PLX PCI9054-AB and Intel 21150, the PCI2050BGHK uniquely combines 66-MHz dual-bus performance, ten secondary clock outputs, CompactPCI hot-swap compliance, and integrated JTAG - making it the only option among the three qualified for high-reliability, multi-module industrial backplanes requiring synchronized timing and field-serviceability.

Availability

PCI2050BGHK is available at Aetrix Electronics and suitable for industrial backplane expansion, CompactPCI hot-swap card development, and legacy PCI system modernization requiring stable component supply and long-term lifecycle support.

Supply support for PCI2050BGHK 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 PCI2050B product line was designed specifically for PCI bus segmentation in ruggedized embedded systems - emphasizing electrical isolation, timing predictability, hot-swap reliability, and backward compatibility with legacy PCI infrastructure.

FAQ

What is the maximum supported PCI bus frequency for the PCI2050BGHK?

The PCI2050BGHK supports operation at up to 66 MHz on both its primary and secondary PCI buses. This is confirmed in Section 1.1 (Features) and Section 6.4 (66-MHz PCI Clock Signal AC Parameters) of the official data manual SCPS076G. The device also maintains full compatibility with 33-MHz PCI systems, allowing seamless integration into mixed-speed environments without hardware or configuration changes. Its 66-MHz capability enables higher bandwidth for demanding applications such as real-time I/O and high-throughput data acquisition.

Does the PCI2050BGHK support CompactPCI hot-swap functionality?

Yes, the PCI2050BGHK fully supports CompactPCI hot-swap functionality as defined in the PICMG CompactPCI Hot-Swap Specification (Revision 1.0). This is explicitly stated in Section 1.1 (Features) and elaborated in Section 3.14 of the data manual. The implementation includes dedicated HSLED, HSENUM, and HSSWITCH/GPIO3 signals, along with internal state machines for safe power sequencing and bus isolation during card insertion/removal - critical for uninterrupted operation in telecom and industrial control systems.

How many secondary PCI clock outputs does the PCI2050BGHK provide?

The PCI2050BGHK provides ten secondary PCI clock outputs (S_CLKOUT0 through S_CLKOUT9), as documented in Section 1.1 (Features) and Table 2−3 (GHK/ZHK Signal Names). These outputs are individually controllable via the Secondary Clock Control Register (Section 5.8) and support phase-aligned distribution to multiple peripherals on the secondary bus - essential for synchronized data capture, motion control, or multi-channel instrumentation.

What package type is used for the PCI2050BGHK?

The PCI2050BGHK uses a 257-terminal MicroStar BGA™ package (GHK variant), as specified in Section 1.4 (Ordering Information) and Section 2 (Terminal Descriptions). This fine-pitch ball grid array offers superior thermal and electrical performance compared to QFP variants (PDV/PPM), making it ideal for high-density CompactPCI carrier boards and thermally constrained embedded applications. Pin compatibility is maintained across GHK and RoHS-compliant ZHK variants.

Is the PCI2050BGHK compatible with both 3.3-V and 5-V PCI signaling environments?

Yes, the PCI2050BGHK features universal PCI interfaces with 3.3-V core logic and 5-V tolerant I/Os, as confirmed in Section 1.1 (Features) and Section 1.4 (Ordering Information). This allows direct connection to either 3.3-V or 5-V PCI slots without level-shifting circuitry - simplifying design reuse across legacy (5-V) and modern (3.3-V) PCI infrastructure while maintaining signal integrity and compliance with PCI Local Bus Specification Rev 2.2.