Introduction
The Intel® 82801E Communications I/O Controller Hub (82801E C-ICH) is a highly integrated multifunctional communications I/O controller hub that provides the interface to the PCI bus and integrates many of the functions needed in today’s communications applications. This document provides a detailed description of the 82801E C-ICH thermal, electrical and mechanical specifications, including signals, pinout, packaging, electrical characteristics, and testability.

Product Features
■ Supports Intel processors, the 82815E GMCH and the 82810E GMCH
■ 8-Bit Hub Interface
    —266 Mbyte/s maximum throughput
■ Two integrated LAN controllers
■ USB
    —Includes one UHCI Host Controller with a total of two ports
    —USB 1.1 compliant
■ PCI Bus interface
    —Supports PCI Rev 2.2 specification at 33 MHz
    —133 Mbyte/s maximum throughput
■ Low-Pincount (LPC) interface
■ Firmware Hub (FWH) interface
    —Supports 8-Mbyte memory size
■ Integrated IDE controller supports Ultra100 DMA, Ultra66 and Ultra33 DMA mode transfers
■ Interrupt Controller
    —Two cascaded 82C59 interrupt controllers
    —Integrated I/O (x) APIC supporting 24 interrupts
    —15 interrupts supported in 8259 mode
■ Two cascaded 8237 DMA controllers
■ Integrated 82C54-compatible timers
■ Real-time clock with 256-byte batterybacked CMOS RAM
■ System Management Bus (SMBus)
    —Compatible with most two-wire components that are also I2C compatible
    —Slave interface allows external microcontroller to access system resources
■ GPIO
    —Exact number varies by configuration. Maximum: 12 inputs, eight outputs, four I/O
■ Integrated 16550 compatible UARTs
    —Two UARTs
    —Serial Interrupts
■ Supports IRQ1/IRQ12 emulation to avoid external keyboard controller
■ 1.8 V operation with 3.3 V I/O. 5 V tolerance on many buffers, including PCI and IDE
■ Package: 421 BGA