Texas Instruments PCI2050BZWT

Overview

PCI2050BZWT 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 3.3-V core logic with 3.3-V/5-V tolerant I/Os, features ten secondary clock outputs, and supports up to nine secondary bus masters via two-tier arbitration - deployed in industrial control backplanes and multifunction CompactPCI cards.

For engineers reviewing the PCI2050BZWT datasheet, PCI2050BZWT pinout, PCI2050BZWT application, or PCI2050BZWT equivalent, key selection criteria include 66-MHz timing compliance, dual-bus latency (4-clock frame-to-frame delay), secondary bus arbitration architecture, and RoHS-compliant 257-pin MicroStar BGA packaging for high-density embedded systems.

Technical Context

The PCI2050BZWT implements a fully compliant PCI-to-PCI Bridge Specification Revision 1.1 architecture with independent read/write buffers and pipeline burst transfers in both directions. It supports Type 0 and Type 1 configuration cycles, frame-to-frame latency of four PCI clocks, and bus locking propagation across primary and secondary domains.

Its power management conforms to PCI Bus Power Management Interface Specification Revision 1.1, with dedicated PMCSR registers and low-power state behavior defined. The device integrates JTAG boundary scan (IEEE 1149.1), GPIO-controlled transaction forwarding, and secondary clock masking - all configurable via extension registers including Chip Control, Arbiter Control, and Hot-Swap Control Status registers.

Key Specifications

Pinout & Package

The PCI2050BZWT is housed in a 257-terminal RoHS-compliant ZHK MicroStar BGA™ package - mechanically and electrically identical to the GHK variant but meeting lead-free manufacturing requirements. Pinout follows the GHK/ZHK terminal mapping per Figure 2−1 and Table 2−3 of 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 PCI2050BGHK, the PCI2050BZWT offers identical performance and feature set with RoHS compliance, while PCI2040BPDV trades 66-MHz capability and hot-swap support for lower cost and simpler assembly - making PCI2050BZWT the sole option for new RoHS-compliant, high-speed, hot-swappable designs.

Availability

PCI2050BZWT is available at Aetrix Electronics and suitable for industrial backplane expansion, CompactPCI hot-swap card development, and multi-slot embedded controller designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for PCI2050BZWT 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 for industrial, automotive, and communications markets.

The PCI2050BZWT belongs to TI's Connectivity Solutions portfolio, designed specifically to extend PCI infrastructure in rugged, high-availability systems - emphasizing electrical isolation, timing predictability, and standards-compliant hot-swap readiness.

FAQ

What is the maximum supported PCI bus frequency for the PCI2050BZWT?

The PCI2050BZWT supports a maximum bus frequency of 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 SCPS076G data manual. Operation at 66 MHz requires adherence to specified AC timing parameters, including setup/hold times and clock jitter limits, and is enabled via the P_M66ENA and S_M66ENA pins.

Does the PCI2050BZWT support hot-swap functionality, and what signals are required?

Yes, the PCI2050BZWT supports CompactPCI hot-swap per PICMG 2.1. Required signals include HSENUM (hot-swap enumeration), HSLED (hot-swap status indicator), and HS_SWITCH/GPIO3 (user-defined hot-swap switch input). These are documented in Section 3.14 and Table 2−3 (GHK/ZHK Signal Names). The device also provides dedicated hot-swap registers (e.g., Hot-Swap Control Status Register) for software coordination.

What package type and RoHS status does the PCI2050BZWT use?

The PCI2050BZWT uses a 257-terminal RoHS-compliant ZHK MicroStar BGA™ package. As stated in Section 1.4 (Ordering Information) and Section 2 (Terminal Descriptions), the ZHK variant is mechanically and electrically identical to the GHK package but meets lead-free manufacturing requirements. The "Z" prefix explicitly denotes RoHS compliance per TI's ordering nomenclature.

How many secondary bus masters can the PCI2050BZWT arbitrate, and how is arbitration implemented?

The PCI2050BZWT supports internal two-tier arbitration for up to nine secondary bus masters, as specified in Section 1.1 and Section 3.6.2. Arbitration uses S_REQ0–S_REQ8 and S_GNT0–S_GNT8 signals. It can operate autonomously or integrate an external arbiter via S_REQ/S_GNT lines - providing flexibility for custom priority schemes or legacy bus protocols beyond standard PCI.

What power management capabilities does the PCI2050BZWT provide, and which specification does it follow?

The PCI2050BZWT complies with the PCI Bus Power Management Interface Specification Revision 1.1. It supports D0–D3hot power states, includes dedicated Power-Management Capabilities and Control/Status registers (Sections 5.10–5.13), and enables wake events such as SERR assertion. Its low-power CMOS process minimizes active and standby current draw while maintaining full 66-MHz functionality in D0 state.