PCI1251BGJG

Controllers Overview

The PCI1251B is a high-performance PC Card controller featuring a 32-bit PCI interface. It supports two independent sockets compliant with the 1997 PC Card Standard, accommodating both 16-bit and 32-bit CardBus cards at 3.3 V or 5 V. The device operates with a 3.3-V core logic and universal PCI interfaces compatible with 3.3-V and 5-V signaling environments. It utilizes advanced submicron CMOS technology for low power consumption while supporting PCI clock rates up to 33 MHz. The controller provides pipelined architecture for sustained bursting and includes internal buffering for hot insertion and removal.

Controllers Feature Summary

• Supports mix-and-match 5-V/3.3-V PC Card 16 cards and 3.3-V CardBus cards in two sockets
• Provides internally buffered zoomed video path reducing design effort for ZV-compatible solutions
• Enables serialized interrupt request multiplexing onto a single IRQSER pin
• Offers five memory windows and two I/O windows per socket for flexible address mapping

Controllers Applications

• Bridging between PCI and PC Cards in notebook computers
• Bridging between PCI and PC Cards in desktop computers
• Systems requiring hot insertion and removal of PC Cards
• Applications utilizing distributed DMA (DDMA) and PC/PCI DMA

Controllers Procurement Notes

Verify the specific package suffix against the datasheet; GFN denotes a 256-pin BGA, while GJG indicates a MicroStar BGA. Confirm that the ordering suffix does not alter functional specifications unless explicitly stated in official documentation. Ensure compatibility with the TPS2206 dual power switch for serial interface control as documented in the system block diagram.

Controllers Selection Notes

Select this component when designing systems requiring compliance with PCI Local Bus Specification Revision 2.2 and ACPI 1.0 standards. It is suitable for applications needing register compatibility with the Intel 82365SL-DF ExCA controller. Consider its ability to handle burst transfers exceeding 130 Mbytes per second for high-throughput data requirements between CardBus and PCI buses.

Controllers Part Context

The PCI1251B is part of Texas Instruments' PC Card controller family designed for PCI bus integration. It serves as a bridge between the PCI bus and PC Card sockets, supporting both legacy 16-bit and newer 32-bit CardBus standards. The device integrates power management features compliant with PCI Bus Power Management Specification and supports various interrupt routing options including parallel and serialized configurations.

Controllers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.