Texas Instruments PCI7412ZHK

Overview

PCI7412ZHK 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, 16-bit CardBus socket control, and dual 1394a physical ports with full OHCI compliance. It enables legacy PC Card expansion in industrial and embedded host systems requiring FireWire connectivity and hot-plug I/O.

For engineers reviewing the PCI7412ZHK datasheet, PCI7412ZHK pinout, PCI7412ZHK application, or PCI7412ZHK equivalent, this device requires attention to its dual-function PCI configuration space (Function 0 for CardBus, Function 1 for OHCI), integrated LDO voltage regulator, ExCA register compatibility, and 48-MHz crystal timing requirement for 1394 PHY operation.

Technical Context

The PCI7412ZHK implements a multifunction PCI device with five distinct functions: Function 0 handles CardBus socket control via ExCA-compliant registers; Function 1 provides full IEEE 1394a OHCI link-layer and PHY control with two independent 1394 ports; Functions 2–4 support flash media, SD host, and smart card interfaces respectively. All functions share a common 32-bit/33-MHz PCI interface and support PCI power management (D0–D3hot).

It integrates an internal low-dropout voltage regulator (LDO-VR) for CardBus VCC generation, supports serial EEPROM (I²C) for configuration storage, and includes programmable interrupt routing for parallel IRQ, serialized IRQSER, and PCI INTA# signals. The device uses a 48-MHz crystal for 1394 PHY clock synthesis and features integrated pull-up resistors on PC Card interface lines.

Key Specifications

Pinout & Package

PCI7412ZHK is housed in a 256-pin Low-Profile Quad Flat Package (LQFP) with 0.4 mm lead pitch, optimized for thermal dissipation and PCB layout compatibility with legacy CardBus host designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCI7412ZHK, TUSB2046B offers no functional overlap in CardBus or 1394 domains, while PCI7402ZHK provides identical hardware compatibility and driver reuse but excludes the dual-port OHCI controller - making it a streamlined alternative for non-FireWire host designs.

Availability

PCI7412ZHK is available at Aetrix Electronics and suitable for industrial data acquisition, medical imaging systems, and test & measurement equipment requiring stable component supply and long-term obsolescence management.

Supply support for PCI7412ZHK 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 company specializing in analog, embedded processing, and connectivity technologies, with decades of leadership in interface and controller ICs.

The PCIxx12 product line - including PCI7412ZHK - was designed specifically for PCI-based host systems needing integrated CardBus socket control and IEEE 1394a FireWire connectivity in a single chip.

FAQ

What is the primary function of the PCI7412ZHK?

The PCI7412ZHK is a multifunction PCI controller IC that integrates a single CardBus socket controller (Function 0), dual-port IEEE 1394a OHCI link-layer and PHY (Function 1), and additional interfaces for flash media, SD host, and smart card (Functions 2–4). Its core role is to serve as a consolidated bridge between a PCI host bus and legacy PC Card peripherals plus FireWire devices. PCI7412ZHK enables synchronized, low-latency communication across both domains while maintaining full ExCA and OHCI software compatibility.

Does the PCI7412ZHK require an external crystal, and what frequency is needed?

Yes, the PCI7412ZHK requires an external 48-MHz fundamental-mode crystal connected to XTAL_IN and XTAL_OUT pins. This crystal directly drives the 1394 PHY PLL and ensures IEEE 1394a-2000 timing compliance for isochronous transfers. The device does not support clock input from other sources for 1394 operation. PCI7412ZHK's internal LDO and CardBus logic operate independently from this crystal, relying instead on the PCI 33-MHz clock and regulated VCC supplies.

How many PCI configuration functions does the PCI7412ZHK implement?

The PCI7412ZHK implements five distinct PCI configuration functions: Function 0 (CardBus socket controller with ExCA registers), Function 1 (OHCI 1394 link-layer and PHY), Function 2 (Flash media interface), Function 3 (SD host controller), and Function 4 (Smart card interface). Each function has its own set of configuration registers, base address mappings, and interrupt assignments. PCI7412ZHK exposes these as separate logical devices on the same PCI bus, allowing independent enumeration and driver binding in compliant operating systems.

Is the PCI7412ZHK pin-compatible with other members of the PCIxx12 family?

Yes, all PCIxx12 family members - including PCI7412ZHK, PCI7402ZHK, PCI7612ZHK, and PCI8412ZHK - share identical 256-pin LQFP packaging and pinout. This allows hardware design reuse across variants; differences are implemented internally via mask options and configuration fuses, not physical layout. PCI7412ZHK's pin mapping matches the family datasheet Terminal Assignments section (Section 2.8), confirming mechanical and electrical compatibility with board footprints designed for any PCIxx12 part.

What power management features does the PCI7412ZHK support?

The PCI7412ZHK supports full PCI Power Management 1.1 (D0–D3hot) and ACPI 1.0 compliance, including PME signaling, Suspend Mode with wake-on-ring, and Clock Run Protocol. It integrates an on-die LDO regulator for CardBus VCC and supports dynamic voltage scaling for 3.3-V/5-V CardBus cards. PCI7412ZHK also implements per-function power gating - allowing Function 1 (OHCI 1394) to enter low-power states independently of the CardBus socket (Function 0) - enabling selective power optimization in mixed-workload systems.