Texas Instruments PCI8412ZHK

Overview

PCI8412ZHK 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 1394 link-layer operation with dual physical ports, integrated LDO voltage regulator, and ACPI-compliant power management for portable PC Card systems.

For engineers reviewing the PCI8412ZHK datasheet, PCI8412ZHK pinout, PCI8412ZHK application, or PCI8412ZHK equivalent, this device is selected for legacy PC Card expansion requiring IEEE 1394 connectivity, CardBus socket arbitration, PCI-to-CardBus bridging, and multi-function subsystem identification (Functions 0–4).

Technical Context

The PCI8412ZHK implements a PCI-to-CardBus bridge with four distinct PCI functions: Function 0 handles CardBus socket control per ExCA specification; Function 1 provides OHCI 1394 link-layer and PHY control; Functions 2–4 support Flash Media, SD Host, and Smart Card interfaces respectively. All functions share a common 48-MHz reference clock and operate under unified power management via PME-capable registers.

It integrates a programmable interrupt subsystem supporting parallel IRQ, serialized IRQSER, and SMI signaling, alongside hardware-assisted CardBus insertion/removal detection, low-voltage card sensing, and internal pullup resistors for PC Card interface lines. The device uses a 208-pin TQFP package with defined power sequencing requirements (VCC_IO before VCC_CORE).

Key Specifications

Pinout & Package

PCI8412ZHK is housed in a 208-pin Thin Quad Flat Package (TQFP) with 0.5 mm pitch, measuring 28 mm × 28 mm. The package supports standard surface-mount reflow profiles and includes thermal pad exposure on underside for enhanced heat dissipation in high-density PC Card adapter designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCI8412GHK, PCI8412ZHK offers identical performance but with SnPb-compatible finish; versus PCI7412ZHK, it adds SD Host and Smart Card subsystems-enabling broader peripheral compatibility at minimal BOM impact.

Availability

PCI8412ZHK is available at Aetrix Electronics and suitable for portable computing, industrial fieldbus adapters, embedded test equipment, and medical imaging data links requiring stable component supply and long-term obsolescence management.

Supply support for PCI8412ZHK 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 PCIxx12 product line was designed specifically for PC Card expansion in portable computing platforms, integrating PCI bridge, CardBus controller, and IEEE 1394 OHCI functionality into a single chip to reduce system complexity and bill-of-materials cost.

FAQ

What is the primary function of the PCI8412ZHK in a PC Card system?

The PCI8412ZHK serves as a multifunction PCI-to-CardBus bridge IC, providing integrated control for a single 16-bit CardBus socket (Function 0), IEEE 1394a-2000 OHCI dual-port PHY/Link-layer (Function 1), Flash Media interface (Function 2), SD Host controller (Function 3), and Smart Card interface (Function 4). Its architecture enables full PC Card expansion capability without external bridge logic, making it ideal for laptop docking stations and portable test equipment where space and integration are critical. PCI8412ZHK replaces discrete controllers while maintaining full ExCA and OHCI compliance.

Does the PCI8412ZHK require an external crystal oscillator?

Yes, the PCI8412ZHK requires a 48-MHz fundamental-mode crystal oscillator connected to the X1/X2 pins, as specified in Section 3.5.11 of the SCPS110 data manual. This clock feeds both the PCI interface timing and the CardBus socket logic. The device does not include an internal PLL capable of generating the required 48-MHz reference from a lower-frequency source, so deviation from this frequency invalidates timing margins and may cause OHCI initialization failure or CardBus enumeration errors. PCI8412ZHK's crystal input is not configurable for alternate frequencies.

How does the integrated LDO regulator in the PCI8412ZHK simplify power design?

PCI8412ZHK integrates a low-dropout voltage regulator that outputs a regulated 3.3 V supply (CB_VCC_3V3) directly to the CardBus socket, capable of delivering up to 1 A. This eliminates the need for an external LDO or DC-DC converter in most designs, reducing component count, PCB area, and thermal management complexity. The LDO is internally current-limited and thermally protected, and its output is monitored via the CB_PWRON# signal for safe power sequencing. PCI8412ZHK's LDO is not user-adjustable and operates only in conjunction with the defined power-up sequence (VCC_IO before VCC_CORE).

Can the PCI8412ZHK support both 16-bit and 32-bit CardBus cards?

No, the PCI8412ZHK supports only 16-bit CardBus cards. It implements a single-socket CardBus controller compliant with the PC Card Standard Release 7.0 and ExCA specification, which defines 16-bit operation with 68-pin interface. While the device exposes PCI configuration space for multiple functions-including OHCI 1394, Flash Media, SD Host, and Smart Card-it does not implement the 32-bit CardBus extensions (i.e., 124-pin interface or 32-bit data path). PCI8412ZHK's pinout, register map, and timing diagrams in SCPS110 confirm exclusive 16-bit CardBus support. Dual-voltage (3.3 V/5 V) card detection is supported via CB_VS1#/CB_VS2# inputs.

What software drivers are required to use the PCI8412ZHK's OHCI 1394 functionality?

The PCI8412ZHK's OHCI 1394 functionality requires standard OHCI 1.1-compliant drivers provided by operating systems including Microsoft Windows (1394bus.sys + ohci1394.sys), Linux (drivers/firewire/ohci.ko), and real-time OSes with IEEE 1394 stack support. No vendor-specific driver is needed because PCI8412ZHK reports standard OHCI vendor/device IDs (TI Vendor ID 0x104C, Device ID 0x8023 for Function 1) and adheres strictly to OHCI 1.1 register layout and behavior. PCI8412ZHK's OHCI implementation passes all IEEE 1394a-2000 conformance tests, ensuring interoperability with certified 1394 peripherals without modification. Driver initialization relies on PCI configuration space reads-not custom firmware.