Texas Instruments PCI2050BIZHK

Overview

PCI2050BIZHK 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 operates at −40°C to +85°C, uses 3.3-V core logic with 5-V tolerant I/Os, and is packaged in a 257-terminal RoHS-compliant MicroStar BGA™ for industrial embedded systems requiring bus segmentation and electrical load isolation.

For engineers reviewing the PCI2050BIZHK datasheet, PCI2050BIZHK pinout, PCI2050BIZHK application, or PCI2050BIZHK equivalent, key selection considerations include 66-MHz timing compliance, secondary bus arbitration scalability (up to nine masters), JTAG boundary-scan testability, and hot-swap event handling per PICMG 1.0.

Technical Context

The PCI2050BIZHK implements a two-tier arbitration architecture-internal arbitration for up to nine secondary bus masters plus optional external arbiter support-and supports concurrent primary/secondary bus transactions with pipeline burst transfers. Its bridge logic complies fully with PCI Local Bus Specification Rev 2.2 and PCI-to-PCI Bridge Spec Rev 1.1.

It features dedicated secondary clock outputs (ten S_CLKOUT signals), configurable power management states (D0–D3hot), and hardware-level error handling including posted write parity/time-out detection, SERR assertion, and master/target abort resolution-all managed via standard PCI configuration space registers and extended diagnostic registers.

Key Specifications

Pinout & Package

PCI2050BIZHK is housed in a 257-terminal RoHS-compliant MicroStar BGA™ package (ZHK variant), mechanically and electrically identical to the GHK package but with lead-free solder finish. Pinout follows Table 2−3 (GHK/ZHK Signal Names Sorted Alphabetically) in the SCPS076G datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCI2050BIZHK, the GHK variant offers identical silicon functionality but lacks RoHS compliance, while the IPDV variant trades BGA density and thermal efficiency for QFP manufacturability-making PCI2050BIZHK the optimal choice for new industrial designs requiring both reliability and regulatory conformance.

Availability

PCI2050BIZHK is available at Aetrix Electronics and suitable for industrial control backplanes, CompactPCI hot-swap systems, and legacy PCI upgrade paths requiring stable component supply across extended product lifecycles.

Supply support for PCI2050BIZHK 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 PCI2050BIZHK belongs to TI's Connectivity Solutions portfolio, designed specifically to extend PCI architecture in ruggedized, high-availability systems where bus segmentation, hot-swap capability, and long-term component stability are critical.

FAQ

What is the operating temperature range of the PCI2050BIZHK?

The PCI2050BIZHK is rated for industrial operation from −40°C to +85°C. This range is validated across all electrical parameters in the SCPS076G datasheet, including timing margins, voltage thresholds, and hot-swap event response. The device maintains full PCI 66-MHz compliance and arbitration functionality throughout this range, making it suitable for deployment in uncontrolled environments such as factory floors or outdoor telecom cabinets.

Does the PCI2050BIZHK support 66-MHz operation on both primary and secondary buses simultaneously?

Yes, the PCI2050BIZHK supports concurrent 66-MHz operation on both primary and secondary PCI buses. Its internal architecture decouples clock domains, allowing independent 66-MHz timing on P_CLK and S_CLK. AC timing parameters-including setup/hold, skew, and propagation delay-are specified for 66-MHz operation in Section 6.4 and 6.5 of the SCPS076G datasheet, and the bridge guarantees frame-to-frame latency of exactly four PCI clocks between buses.

How does the PCI2050BIZHK implement CompactPCI hot-swap functionality?

The PCI2050BIZHK implements PICMG CompactPCI Hot-Swap Specification Rev 1.0 using dedicated hardware signals: HSENUM enables hot-swap logic, HSLED drives front-panel status indication, and HSSWITCH/GPIO3 detects physical insertion. Internal state machines manage power sequencing, S_RST assertion, and secondary bus isolation during insertion/removal. All hot-swap events are reported via the Hot-Swap Control Status Register (Section 5.18), accessible through PCI configuration space.

What arbitration schemes does the PCI2050BIZHK support on the secondary bus?

The PCI2050BIZHK supports two arbitration modes on the secondary bus: internal two-tier arbitration for up to nine masters (via S_REQ/S_GNT signals), and external arbitration via dedicated S_REQn/S_GNTn pins. The Arbiter Control Register (Section 5.3) configures arbitration priority and timeout behavior. External arbitration is enabled by asserting the EXTERNAL_ARB bit, allowing integration with third-party arbiters while preserving full PCI compliance.

Is the PCI2050BIZHK pin-compatible with other variants in the PCI2050B family?

Yes, the PCI2050BIZHK is pin-compatible with the PCI2050BGHK (same 257-BGA footprint), differing only in RoHS compliance and solder finish. It is not pin-compatible with PDV or PPM QFP variants due to distinct package types and terminal counts. Migration between ZHK and GHK requires no PCB changes; migration to QFP packages necessitates full layout redesign due to mechanical and routing incompatibility.