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Texas Instruments PCI2250PCMG4
- Part No.:
- PCI2250PCMG4
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 160-BQFP
- Datasheet:
-
PCI2250PCMG4.pdf
- Description:
- IC INTERFACE SPECIALIZED 160QFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,576
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Product details
Overview
PCI2250PCMG4 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 electrical load isolation and hot-swap capability.
For engineers reviewing the PCI2250PCMG4 datasheet, PCI2250PCMG4 pinout, PCI2250PCMG4 application, or PCI2250PCMG4 equivalent, key selection criteria include dual-bus timing compliance, CPCI hot-swap support, subtractive/positive decoding flexibility, and 3.3-V core with 5-V tolerant I/Os for mixed-voltage system integration.
Technical Context
The PCI2250PCMG4 implements full PCI Local Bus Specification Rev. 2.2 and PCI-to-PCI Bridge Architecture Specification Rev. 1.1 compliance, including Type 0/Type 1 configuration cycles, posted write handling, and SERR/PERR propagation. Its bridge control logic enforces predictable latency, supports bus locking, and manages master/target abort conditions per specification.
It features dedicated primary and secondary interface blocks with independent read/write buffers, five programmable secondary clock outputs (S_CLKOUT0–S_CLKOUT4), and configurable CLKRUN bridging for mobile/docking power management. The device supports both internal and external secondary bus arbitration and includes extension registers for fine-grained window mapping and diagnostic control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bus Interface | Two independent 32-bit, 33-MHz PCI buses (primary & secondary) |
| Core Voltage | 3.3 V with 5-V tolerant I/Os - enables interoperability across legacy 5-V and modern 3.3-V PCI slots |
| Compliance | Fully compliant with PCI Local Bus Spec Rev. 2.2 and PCI-to-PCI Bridge Spec Rev. 1.1 |
| Arbitration | Internal two-tier arbitration supporting up to four secondary bus masters; external arbiter interface available |
| Hot-Swap Support | Compact-PCI Hot Swap Specification Rev. 1.0 compliant - enables safe insertion/removal in live backplanes |
| Decoding Modes | Configurable positive or subtractive decoding on primary interface; serial/parallel port address decoding supported |
| Power Management | PCI Power Management Interface Spec Rev. 1.0/1.1 compliant; CLKRUN signal bridging enabled |
Pinout & Package
PCI2250PCMG4 is packaged in a 176-pin thin LQFP (PGF) with 0.5-mm pitch, designed for high-density industrial PCB layouts and thermal reliability in backplane applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P_AD[31:0] | Primary Address/Data Bus | 32-bit multiplexed address/data lines for primary PCI interface; bidirectional, time-multiplexed operation |
| S_AD[31:0] | Secondary Address/Data Bus | 32-bit multiplexed address/data lines for secondary PCI interface; fully independent timing path |
| P_C/BE[3:0] | Primary Command/Byte Enable | Four active-low byte enable signals controlling data strobing during primary bus transfers |
| S_C/BE[3:0] | Secondary Command/Byte Enable | Four active-low byte enable signals controlling data strobing during secondary bus transfers |
| P_CLK / S_CLK | Primary & Secondary Clock Inputs | Asynchronous 33-MHz PCI clocks; each bus operates independently with separate clock domains |
| S_CLKOUT[0:4] | Secondary Clock Outputs | Five buffered 33-MHz clock outputs for driving secondary bus peripherals; individually controllable |
| P_RST / S_RST | Primary & Secondary Reset Inputs | Asynchronous reset assertion forces respective bus into reset state; secondary bus driven low during reset |
| P_REQ / S_REQ[3:0] | Bus Request Signals | Primary request (P_REQ); four secondary request lines (S_REQ0–S_REQ3) for internal arbitration |
| P_GNT / S_GNT[3:0] | Bus Grant Signals | Primary grant (P_GNT); four secondary grant lines (S_GNT0–S_GNT3) for internal arbitration |
| P_IDSEL / S_IDSEL | Initialization Device Select | Used during configuration space access; P_IDSEL for primary, S_IDSEL for secondary bus enumeration |
Key Features
| Feature | Design Value |
|---|---|
| Burst-mode pipeline architecture | Enables concurrent read/write transactions across both buses, maximizing throughput without interlock stalls |
| Programmable extension windows | Two configurable memory/I/O windows allow flexible address space partitioning between primary and secondary buses |
| VGA palette memory & I/O decode | Hardware-accelerated decoding of VGA-specific I/O ranges simplifies graphics subsystem integration |
| Advanced submicron CMOS process | Reduces dynamic and static power consumption while maintaining full 33-MHz timing margins |
| Compact-PCI hot-swap extended capability | Supports PICMG-defined hot-swap sequences including presence detection, power sequencing, and fault signaling |
Applications
| Industrial Backplane Systems | Embedded Computing Racks |
|---|---|
Use Scenario: Modular chassis with multiple PCI mezzanine cards requiring electrical isolation beyond 10-device PCI limit. IC Role / Device Role / Timing Role: PCI2250PCMG4 acts as hierarchical bridge, segmenting one root complex into multiple secondary buses to reduce loading and improve signal integrity. Use Value: Enables scalable expansion beyond PCI electrical limits while preserving full protocol compliance and burst transfer performance. | Use Scenario: Rack-mounted embedded controller with hot-swappable I/O modules for factory automation. IC Role / Device Role / Timing Role: PCI2250PCMG4 provides CPCI-compliant hot-swap infrastructure and bridges CPU-side PCI to module-side peripheral buses. Use Value: Allows field replacement of I/O modules without powering down the entire system, meeting industrial uptime requirements. |
| Mobile Docking Stations | Legacy System Upgrades |
Use Scenario: Laptop docking station with PCI expansion slots supporting external GPUs, storage, or networking. IC Role / Device Role / Timing Role: PCI2250PCMG4 bridges host laptop's PCI bus to dock's secondary PCI bus, enabling CLKRUN-based power gating. Use Value: Reduces idle power by allowing secondary bus clocks to halt when inactive - critical for battery-operated docks. | Use Scenario: Retrofitting older 5-V PCI systems with newer 3.3-V peripherals while maintaining compatibility. IC Role / Device Role / Timing Role: PCI2250PCMG4 serves as voltage-tolerant bridge, translating between 5-V signaling on primary side and 3.3-V on secondary side. Use Value: Eliminates need for level-shifter components and preserves signal timing integrity across mixed-voltage domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PCI-to-PCI bridge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PLX Technology PCI9050 | PCI-to-Local Bus bridge (not PCI-to-PCI); lacks secondary bus arbitration and dual-PCI timing compliance | Designed for custom local bus peripherals, not hierarchical PCI expansion | Select only if interfacing non-PCI devices (e.g., FPGA, ASIC) - not a functional substitute for PCI2250PCMG4 |
| Intel 21150 | PCI-to-PCI bridge with identical 32-bit/33-MHz dual-bus architecture but no CPCI hot-swap support or CLKRUN bridging | Targeted at desktop/server motherboards, not ruggedized hot-swap backplanes | Prefer for cost-sensitive non-hot-swap applications where CPCI compliance is unnecessary |
Compared with PLX PCI9050 and Intel 21150, the PCI2250PCMG4 uniquely combines full PCI-to-PCI bridging, Compact-PCI hot-swap certification, and CLKRUN-aware power management - making it the only option for industrial backplane designs requiring live module replacement and mobile-dock power efficiency.
Availability
PCI2250PCMG4 is available at Aetrix Electronics and suitable for industrial backplane systems, embedded computing racks, mobile docking stations, and legacy system upgrades requiring stable component supply and long-term obsolescence management.
Supply support for PCI2250PCMG4 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 PCI2250 product line was engineered specifically for hierarchical PCI system expansion - addressing electrical loading limits, hot-swap readiness, and power-constrained mobile docking use cases in late-1990s industrial and enterprise platforms.
FAQ
What is the primary function of the PCI2250PCMG4 in a PCI system architecture?
The PCI2250PCMG4 functions as a PCI-to-PCI bridge that connects two independent 32-bit, 33-MHz PCI buses, enabling hierarchical expansion beyond the 10-device electrical loading limit. It supports concurrent burst-mode transactions, internal arbitration for up to four secondary bus masters, and full compliance with PCI Local Bus and PCI-to-PCI Bridge specifications - making it essential for scalable backplane and modular embedded systems. The PCI2250PCMG4 ensures protocol integrity while isolating noise and timing skew between bus segments.
Does the PCI2250PCMG4 support hot-swap functionality, and if so, which standard does it follow?
Yes, the PCI2250PCMG4 supports Compact-PCI (CPCI) hot-swap functionality as defined in the PICMG Compact-PCI Hot Swap Specification Revision 1.0. It implements hardware-level features including NO/HSLED status signaling, GOZ (gate-off-zero) control, and power sequencing support required for safe insertion and removal in live backplane environments. This capability is integrated directly into the PCI2250PCMG4 silicon - no external logic is needed to meet CPCI hot-swap compliance.
What are the voltage requirements for the PCI2250PCMG4, and how does it handle mixed-voltage PCI environments?
The PCI2250PCMG4 uses a 3.3-V core supply but features 5-V tolerant I/Os on both primary and secondary PCI interfaces. This allows seamless integration into mixed-voltage systems - for example, connecting a 5-V legacy PCI host to 3.3-V peripheral cards - without external level shifters. All PCI signaling pins meet both 3.3-V and 5-V PCI electrical specifications, and the device automatically adapts to the voltage present on each bus segment. The PCI2250PCMG4 maintains full timing compliance under either condition.
How many secondary clock outputs does the PCI2250PCMG4 provide, and what is their purpose?
The PCI2250PCMG4 provides five dedicated secondary PCI clock outputs: S_CLKOUT0 through S_CLKOUT4. These are buffered, phase-aligned 33-MHz clocks intended to drive downstream peripherals on the secondary bus - such as I/O controllers, memory interfaces, or expansion slots - without loading the main S_CLK input. Each output can be individually enabled or disabled via the Secondary Clock Control Register, allowing precise clock distribution control and reducing EMI in multi-peripheral configurations. This feature is explicitly documented in the PCI2250PCMG4 data manual Section 3.5 and Figure 3–5.
Can the PCI2250PCMG4 be used in mobile or low-power applications, and what power management features does it support?
Yes, the PCI2250PCMG4 supports PCI Power Management Interface Specification Revisions 1.0 and 1.1, including D0–D3 power states and CLKRUN signal bridging. The CLKRUN feature allows the secondary bus clock to be gated when idle - significantly reducing dynamic power in docking stations and portable expansion systems. Its advanced submicron CMOS process minimizes leakage current, and the device maintains full 33-MHz operation while consuming less than 1.2 W typical under active load. These capabilities make the PCI2250PCMG4 suitable for battery-sensitive mobile docking applications where the PCI2250PCMG4 replaces higher-power alternatives.
PCI2250PCMG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 160-BQFP
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Applications:
- PCI-to-PCI Bridge
- Interface:
- PCI
- Voltage - Supply:
- 3V ~ 3.6V
- Supplier Device Package:
- 160-QFP (28x28)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
PCI2250PCMG4 FAQ
1.How can I place an order for PCI2250PCMG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCI2250PCMG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PCI2250PCMG4 reliable?
The price and inventory of PCI2250PCMG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCI2250PCMG4 is usually 5 days.
3.What payment methods are accepted for PCI2250PCMG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCI2250PCMG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCI2250PCMG4?
PCI2250PCMG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCI2250PCMG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PCI2250PCMG4?
For technical support, including PCI2250PCMG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCI2250PCMG4 requirements.
6.How does Aetrix verify that PCI2250PCMG4 is sourced from the original manufacturer or authorized distributors?
All PCI2250PCMG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PCI2250PCMG4 meets industry standards.
7.What is the process for return or replacement of PCI2250PCMG4?
All PCI2250PCMG4 units undergo pre-shipment inspection (PSI). If there is an issue with PCI2250PCMG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PCI2250PCMG4 part is unused and in its original packaging.
Return procedure for PCI2250PCMG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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