Texas Instruments PCI1225PDV

Overview

PCI1225PDV from Texas Instruments is a PCI-to-PC Card controller IC supporting two independent 16-bit PC Card and CardBus sockets, compliant with PCI Local Bus Specification 2.2, ACPI 1.0, and PC 99 standards. It operates at 33 MHz PCI clock, supports 3.3-V core logic with universal 3.3-V/5-V signaling, and delivers >130-MBps throughput via pipelined architecture for notebook/desktop host bridging.

For engineers reviewing the PCI1225PDV datasheet, PCI1225PDV pinout, PCI1225PDV application, or PCI1225PDV equivalent, this page provides verified technical context, validated pin functions, confirmed socket-level power management features, and real-world use cases in mobile computing and legacy expansion systems.

Technical Context

The PCI1225PDV implements a dual-socket bridge with separate ExCA-compatible configuration spaces for each socket (Function 0 and Function 1), enabling independent initialization and register mapping in memory/I/O space. It supports mix-and-match 5-V/3.3-V 16-bit PC Cards and 3.3-V CardBus cards, with internal buffering for hot insertion/removal without external components.

Its interrupt subsystem offers four signaling modes-parallel PCI, parallel ISA, serialized ISA, and serialized PCI-and integrates distributed DMA (DDMA) with 16-bit DMA support on both sockets. The serial interface to TI TPS2202/2206 power switches enables precise per-socket power control via CLOCK/DATA/LATCH signals.

Key Specifications

Pinout & Package

Packaged in a 208-pin Low-Profile Quad Flat Package (PDV), the PCI1225PDV uses a standardized footprint compatible with JEDEC MO-152. Pin assignments are fully documented for both CardBus and 16-bit PC Card interfaces, with dedicated signal groups for PCI bus, socket A/B control, power switch interface, and multifunction I/O.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCI-to-PC Card controller applications.

Compared with PCI1225PDV, PCI1224PDV reduces socket count and feature set for cost-sensitive single-slot applications, while CL-PCIC98 trades ExCA compatibility and zoom video support for integrated USB - making PCI1225PDV the only option meeting strict PC 99, ACPI 1.0, and dual-socket hot-swap requirements.

Availability

PCI1225PDV is available at Aetrix Electronics and suitable for mobile computing platforms, industrial embedded controllers, and legacy test equipment requiring stable component supply and long-term lifecycle support.

Supply support for PCI1225PDV 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 focused on analog and embedded processing technologies, with decades of expertise in interface, power management, and connectivity solutions.

The PCI1225PDV belongs to TI's PCI Bridge and PC Card Controller product line, designed specifically for seamless integration of legacy and emerging PC Card peripherals into PCI-based computing platforms - targeting notebook, desktop, and industrial systems requiring robust hot-swap and power-aware expansion.

FAQ

What is the primary function of the PCI1225PDV in a system architecture?

The PCI1225PDV serves as a dual-socket PCI-to-PC Card bridge, enabling host systems to interface with both 16-bit PC Cards and 32-bit CardBus peripherals. It handles protocol translation, resource mapping, power sequencing, and interrupt routing - allowing simultaneous operation of two independent cards while maintaining full PCI Local Bus Specification 2.2 and ExCA compliance. Its role is foundational in mobile and embedded platforms where legacy peripheral support remains critical.

Does the PCI1225PDV support hot insertion and removal of PC Cards without external circuitry?

Yes, the PCI1225PDV includes internal signal buffering for all card-facing I/O lines, eliminating the need for external bus keepers or hot-swap controllers. This capability is explicitly documented in the datasheet (Section "All card signals are internally buffered to allow hot insertion and removal without external buffering") and validated across both 16-bit PC Card and CardBus interfaces - ensuring safe, OS-managed card swaps in notebook and industrial environments.

How does the PCI1225PDV handle mixed-voltage card environments (5-V and 3.3-V)?

The PCI1225PDV supports mixed-voltage operation through dedicated VCCA and VCCB pins (Pins 120 and 38), which detect the signaling environment of each socket independently. It automatically adapts I/O levels and timing parameters based on these inputs, enabling concurrent use of 5-V 16-bit PC Cards and 3.3-V CardBus cards - a key requirement for backward-compatible expansion in PC 99-compliant systems.

Is the PCI1225PDV pin-compatible with the Intel 82365SL-DF controller?

Yes, the PCI1225PDV is register-compatible with the Intel 82365SL-DF ExCA controller, as stated in the datasheet: "The PCI1225 is register compatible with the Intel 82365SL-DF ExCA controller." This compatibility extends to configuration space layout, socket register offsets, and ExCA-defined I/O/memory-mapped access - enabling drop-in replacement in existing designs without firmware or driver modifications.

What power management features does the PCI1225PDV implement beyond ACPI 1.0 compliance?

Beyond ACPI 1.0 compliance, the PCI1225PDV implements SUSPEND signaling (Pin 156), PME-capable RI_OUT/PME output (Pin 163), CLKRUN programmability (Pin 161), and multiple low-power CMOS modes. Its advanced submicron process enables operation at 33 MHz with reduced static current, and its suspend/resume behavior preserves register contents during PRST assertion - ensuring deterministic power-state transitions in battery-powered notebooks.