General description

The ISP1122A is a stand-alone Universal Serial Bus (USB) hub device which complies with USB Specification Rev. 1.1. It integrates a Serial Interface Engine (SIE), hub repeater, hub controller, USB data transceivers and a 3.3 V voltage regulator. It has a configurable number of downstream ports, ranging from 2 to 5.

Features

■ High performance USB hub device with integrated hub repeater, hub controller, Serial Interface Engine (SIE), data transceivers and 3.3 V voltage regulator

■ Complies with Universal Serial Bus Specification Rev. 1.1 and ACPI, OnNow and USB power management requirements

■ Configurable from 2 to 5 downstream ports with automatic speed detection

■ Internal power-on reset and low voltage reset circuit

■ Supports bus-powered, hybrid-powered and self-powered application

■ Individual or ganged power switching for downstream ports

■ Individual or global port overcurrent protection with built-in sense circuits

■ 6 MHz crystal oscillator with on-chip PLL for low EMI

■ Visual USB traffic monitoring (GoodLink™) for hub and downstream ports

■ I2C-bus interface to read vendor ID, product ID and configuration bits from external EEPROM

■ Operation over the extended USB bus voltage range (4.0 to 5.5 V)

■ Operating temperature range −40 to +85 °C

■ 8 kV in-circuit ESD protection for lower cost of external components

■ Full-scan design with high test coverage

■ Available in 32-pin SDIP, SO and LQFP packages.