Texas Instruments PCI1520IZWT

Overview

PCI1520IZWT from Texas Instruments is a dual-slot PCI-to-CardBus bridge controller implementing ExCA-compliant register mapping, supporting hot-plug 16-bit PC Cards and 32-bit CardBus cards at 3.3 V or 5 V, with pipelined 32-bit PCI interface, integrated LDO-VR for 2.5-V core supply, and up to five general-purpose I/Os. It enables high-throughput bridging in notebook and desktop expansion slots.

For engineers reviewing the PCI1520IZWT datasheet, PCI1520IZWT pinout, PCI1520IZWT application, or PCI1520IZWT equivalent, key selection considerations include its dual-socket hot-swap capability, ExCA/82365SL register compatibility, PCI bus mastering during CardBus transactions, and support for serialized/parallel IRQ signaling in mobile and embedded host systems.

Technical Context

The PCI1520IZWT implements a full PCI-to-CardBus bridge with two independent socket interfaces, each with dedicated memory and I/O windows (five memory + two I/O per 16-bit interface; two memory + two I/O per CardBus socket). Its internal data path supports 8-, 16-, and 32-bit card access via full 32-bit PCI cycles and fast posted writes.

It integrates an LDO-VR for on-chip 2.5-V core regulation, uses advanced quarter-micron CMOS for ultralow-power operation at 33 MHz PCI clock, and provides programmable CLKRUN output, ring oscillator, and socket activity LED drivers. Power management complies with PCI Bus Power Management Interface Specification Rev. 1.1 and ACPI 1.1.

Key Specifications

Pinout & Package

PCI1520IZWT is housed in a 209-ball MicroStar BGA (GHK package), optimized for low-profile notebook designs. Ball pitch is 1.0 mm; package dimensions are 15 mm × 15 mm × 1.2 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCI-to-CardBus bridge applications.

Compared with PCI1420IZWT and 82365SL-DF, PCI1520IZWT delivers dual-socket flexibility, integrated core regulation, and >130 Mbps throughput - making it optimal for new notebook, docking, and industrial host designs requiring scalable, low-power CardBus expansion.

Availability

PCI1520IZWT is available at Aetrix Electronics and suitable for notebook expansion slots, industrial PCMCIA hosts, and embedded test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PCI1520IZWT 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, embedded processing, and connectivity technologies for industrial, automotive, and computing applications.

The PCI1520IZWT belongs to TI's PC Card controller product line, engineered specifically for low-power, high-reliability PCI-to-CardBus bridging in mobile and embedded host systems compliant with PC Card Standard Rev. 7.1 and ACPI 1.1.

FAQ

What is the primary function of the PCI1520IZWT?

The PCI1520IZWT is a dual-slot PCI-to-CardBus bridge controller that enables host systems to interface with both 16-bit PC Cards and 32-bit CardBus peripherals. It implements ExCA-compliant register mapping, supports hot insertion/removal, provides integrated 2.5-V core regulation via LDO-VR, and delivers >130 Mbps sustained throughput. The PCI1520IZWT is designed for use in notebooks, docking stations, and industrial PCs requiring scalable, low-power expansion.

Does the PCI1520IZWT require an external 2.5-V power supply?

No. The PCI1520IZWT integrates a low-dropout voltage regulator (LDO-VR) that generates the required 2.5-V core supply from the 3.3-V I/O rail (VCC_3V3). This eliminates the need for an external 2.5-V regulator, reducing BOM cost and PCB area. The LDO-VR is confirmed in Section 3.8.1 and Table 2−5 of the datasheet, and is explicitly listed as a feature in Section 1.2.

Is the PCI1520IZWT pin-compatible with the Intel 82365SL-DF?

No - the PCI1520IZWT is register-compatible but not pin-compatible with the Intel 82365SL-DF. It uses a 209-ball GHK BGA package, whereas the 82365SL-DF uses a 208-pin QFP. While both share identical ExCA register layouts and functional behavior, their physical interfaces differ significantly. The PCI1520IZWT datasheet states "register-compatible", not "pin-compatible", and highlights package differences in Section 1.5 and Figure 2−2.

What power management features does the PCI1520IZWT support?

The PCI1520IZWT supports comprehensive power management including PCI Power Management (PME), ACPI 1.1 compliance, Clock Run Protocol (CLKRUN), CardBus CCLKRUN, SUSPEND mode, and Ring Indicate (RI_OUT). It implements the PCI Bus Power Management Interface Specification Rev. 1.1 and includes dedicated registers for power-state control, status, and context retention. These capabilities are detailed in Sections 3.8 and 4.37–4.40 of the datasheet.

Can the PCI1520IZWT support both 5-V and 3.3-V PC Cards simultaneously?

Yes. The PCI1520IZWT supports mix-and-match operation: one socket can host a 5-V 16-bit PC Card while the other hosts a 3.3-V CardBus card. Its I/Os are 5-V tolerant, and it interfaces directly with TI TPS222X power switches to independently control VCC per socket. This dual-voltage capability is explicitly stated in Section 1.1 and Section 1.2 of the datasheet and validated in Tables 3−2 and 2−6.