Texas Instruments PCI7402ZHK

Overview

PCI7402ZHK from Texas Instruments is a single-socket CardBus controller IC integrating IEEE 1394a-2000 OHCI two-port PHY/link-layer functionality, supporting 32-bit/33-MHz PCI bus interface and 16-bit CardBus socket control. It delivers full OHCI-compliant FireWire connectivity with integrated power management, serial EEPROM I²C interface, and multi-function terminal routing for PC Card systems.

For engineers reviewing the PCI7402ZHK datasheet, PCI7402ZHK pinout, PCI7402ZHK application, or PCI7402ZHK equivalent, this device is selected for legacy PC Card-based FireWire expansion designs requiring integrated PCI-to-CardBus bridging, dual-port 1394 PHY/link-layer operation, and low-voltage card detection with Suspend/Resume support per ACPI 1.0b.

Technical Context

The PCI7402ZHK implements a dual-function PCI device: Function 0 handles CardBus socket control (ExCA-compliant), while Function 1 provides full OHCI 1394a-2000 link-layer and PHY interface with two independent 1394 ports. It supports both 3.3-V and 5-V PCI signaling and includes integrated LDO voltage regulation for CardBus power switching.

Its architecture integrates programmable interrupt subsystems for parallel IRQ/PCI interrupts and serialized IRQSER, along with dedicated registers for CardBus memory/I/O window mapping, socket event masking, and OHCI register access via TI-specific extensions. Power management follows PCI 2.2, ACPI 1.0b, and CardBus 4.2 specifications.

Key Specifications

Pinout & Package

PCI7402ZHK is housed in a 208-pin TQFP package (28 mm × 28 mm, 0.5-mm pitch) with thermal pad. Pin assignments are defined in Section 2.8 ("Terminal Assignments") and Section 2.9 ("Detailed Terminal Descriptions") of SCPS110.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CardBus + IEEE 1394 controller applications.

Compared with TIBB1202GHK, PCI7402ZHK delivers dual-port 1394 capability and integrated power regulation, enabling compact, self-contained FireWire expansion. Against PCI7412ZHK, it reduces complexity and power consumption by omitting unused SD/Flash controllers-ideal for dedicated FireWire adapter designs.

Availability

PCI7402ZHK is available at Aetrix Electronics and suitable for FireWire expansion cards, industrial PC Card adapters, legacy notebook docking stations, and medical imaging data acquisition systems requiring stable component supply and long-term obsolescence planning.

Supply support for PCI7402ZHK 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, with decades of expertise in interface and controller ICs.

The PCI7402ZHK belongs to TI's PCIxx12 family of multifunction CardBus controllers, designed specifically for backward-compatible PC Card expansion in legacy computing and industrial platforms requiring IEEE 1394a-2000 integration.

FAQ

What is the primary function of the PCI7402ZHK in a PC Card system?

The PCI7402ZHK serves as a dual-function PCI-to-CardBus bridge: Function 0 implements a fully ExCA-compliant CardBus socket controller, while Function 1 provides IEEE 1394a-2000 OHCI link-layer and PHY functionality for dual-port FireWire connectivity. It enables legacy laptops and embedded hosts to add high-speed, hot-pluggable peripheral interfaces without modifying the motherboard. The PCI7402ZHK integrates all necessary control logic, power switching, and configuration registers to manage card insertion, voltage negotiation, and 1394 packet handling in a single IC.

Does the PCI7402ZHK support both 3.3-V and 5-V CardBus cards?

Yes, the PCI7402ZHK supports automatic detection and power switching for both 3.3-V and 5-V CardBus cards via its CBxVPP and CBxVCC outputs, which drive external FETs. Its integrated power management circuitry complies with PCMCIA CardBus 4.2 specifications for low-voltage card detection and safe hot-swap sequencing. The PCI7402ZHK uses dedicated status pins and internal comparators to determine card voltage class before enabling power, ensuring reliable operation across mixed-voltage environments without external supervision.

How does the PCI7402ZHK handle IEEE 1394 bus resets and arbitration?

The PCI7402ZHK implements full IEEE 1394a-2000 OHCI-compliant link-layer logic, including hardware-assisted bus reset detection, tree identification, and fair arbitration using the 1394 cycle timer. Its integrated PHY handles physical-layer signaling, cable detection, and speed negotiation (100/200/400 Mbps). The PCI7402ZHK maintains precise cycle timing accuracy (< ±50 ppm) and supports isochronous resource allocation through dedicated OHCI registers mapped in Function 1's PCI BAR space. This ensures deterministic latency and guaranteed bandwidth for real-time FireWire applications.

Can the PCI7402ZHK operate without an external serial EEPROM?

The PCI7402ZHK can operate without an external serial EEPROM for basic functionality, but critical configuration data-including subsystem ID, vendor ID overrides, and power-up defaults-is stored in the EEPROM. TI's reference design assumes a 2-Kbit I²C EEPROM (e.g., AT24C02) connected to SDA/SCL pins. Without it, the device boots with factory-default values, which may prevent proper OS driver recognition or cause incorrect socket voltage assignment. Therefore, while functional in minimal test setups, production use of the PCI7402ZHK requires the external EEPROM for reliable enumeration and compliance.

What power management states does the PCI7402ZHK support, and how are they triggered?

The PCI7402ZHK supports PCI D0–D3hot/D3cold states and ACPI S0–S5 sleep states, including Suspend Mode (S3) with wake-on-ring and PME# assertion. These states are triggered via PCI Configuration Space Power Management Capability registers (offset 0x40–0x50) and controlled by host software or BIOS. The PCI7402ZHK also implements Clock Run Protocol and integrated LDO shutdown during D3cold to minimize leakage current. All transitions comply with PCI 2.2 and ACPI 1.0b specifications, and the PCI7402ZHK maintains register context across D0–D3hot transitions for seamless resume.