Texas Instruments PCI2250PGF

Overview

The PCI2250PGF from Texas Instruments is a PCI-to-PCI bridge IC enabling hierarchical expansion of PCI bus systems. It supports two independent 32-bit, 33-MHz PCI buses, provides internal two-tier arbitration for up to four secondary bus masters, and implements programmable extension windows and port decode for custom I/O mapping - deployed in industrial backplane systems requiring hot-swap-capable multifunction CPCI cards.

For engineers reviewing the PCI2250PGF datasheet, PCI2250PGF pinout, PCI2250PGF application, or PCI2250PGF equivalent, this page delivers verified electrical specs, LQFP-176 terminal mapping, Compact-PCI hot-swap support details, and real-world bridge configuration trade-offs for embedded system architects and board designers.

Technical Context

The PCI2250PGF implements full compliance with PCI Local Bus Specification Rev. 2.2 and PCI-to-PCI Bridge Architecture Specification Rev. 1.1. Its dual-bus architecture enables concurrent primary and secondary transactions with burst-mode pipelining, while supporting both positive and subtractive decoding on the primary interface.

It integrates five secondary PCI clock outputs (S_CLKOUT0–S_CLKOUT4), supports CLKRUN bridging per PCI Power Management Interface Spec Rev. 1.1, and features dedicated registers for hot-swap control (HS Capability ID, Hot Swap Control Status), extended diagnostics, and arbiter timeout management - all accessible via standard PCI configuration space.

Key Specifications

Pinout & Package

PCI2250PGF is housed in a 176-pin LQFP (Low-Profile Quad Flat Package) with 0.5-mm lead pitch, optimized for compact-PCI board layouts and thermal reliability in conduction-cooled systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCI9050 and 21152, the PCI2250PGF uniquely integrates CPCI hot-swap signaling (NO/HSLED, GOZ), five secondary clocks, and VGA palette decode - making it the only option for ruggedized, field-serviceable multifunction CPCI cards requiring zero-layout changes for legacy compatibility.

Availability

PCI2250PGF is available at Aetrix Electronics and suitable for industrial backplane expansion, Compact-PCI hot-swap card development, and mobile docking station designs requiring stable component supply and long-term lifecycle support.

Supply support for PCI2250PGF 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 PCI2250PGF belongs to TI's PCI Bus Solutions product line - engineered specifically for hierarchical PCI system expansion with emphasis on hot-swap readiness, power efficiency, and legacy compatibility in rugged embedded platforms.

FAQ

What is the package type and pin count of the PCI2250PGF?

PCI2250PGF uses a 176-pin Low-Profile Quad Flat Package (LQFP) with 0.5-mm lead pitch. This package is explicitly designated by the "PGF" suffix and differs from the 160-pin QFP ("PCM") variant. The LQFP footprint supports higher I/O density and improved thermal performance in compact-PCI applications.

Does the PCI2250PGF support both 3.3-V and 5-V PCI signaling environments?

Yes, the PCI2250PGF features 3.3-V core logic with 5-V tolerant I/Os - enabling interoperability with both 3.3-V and 5-V PCI slots without level-shifting circuitry. This dual-voltage compatibility is confirmed in Section 1.2 of the SCPS051 datasheet and validated in Recommended Operating Conditions (Section 6.3).

How does the PCI2250PGF implement Compact-PCI hot-swap functionality?

The PCI2250PGF implements PICMG Compact-PCI Hot Swap Spec Rev. 1.0 via dedicated pins: NO/HSLED drives status LEDs, GOZ forces output high-impedance during insertion/removal, and integrated registers (e.g., Hot Swap Control Status Register at offset 5–22) manage power sequencing and fault reporting - eliminating need for external hot-swap controllers.

What clocking resources does the PCI2250PGF provide for secondary bus peripherals?

The PCI2250PGF provides five independent 33-MHz secondary PCI clock outputs (S_CLKOUT0 through S_CLKOUT4), each capable of driving one PCI slot or peripheral. These clocks are fully synchronized to the primary PCI clock and support separate enable/disable control - critical for power-managed multi-slot CPCI systems.

Can the PCI2250PGF be used in systems requiring VGA palette memory compatibility?

Yes, the PCI2250PGF includes hardware support for VGA palette memory and I/O decoding (Section 1.2, Feature list). It recognizes and routes accesses to standard VGA palette registers (3C0h–3CCh) to the secondary bus - enabling seamless integration of legacy VGA controllers without external address decoding logic.