Philips Universal Serial Bus ISP1122 Specification Sheet

1. General description

2. Features

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ISP1122
Universal Serial Bus stand-alone hub
Rev. 03 — 29 March 2000
The ISP1122 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.
The ISP1122 can be bus-powered, self-powered or hybrid-powered. When it is
hybrid-powered the hub functions are powered by the upstream power supply (V
but the downstream ports are powered by an external 5 Volt supply. The low power
consumption in 'suspend' mode allows easy design of equipment that is compliant
with the ACPI™, OnNow™ and USB power management requirements.
The ISP1122 has built-in overcurrent sense inputs, supporting individual and global
overcurrent protection for downstream ports. All ports (including the hub) have
GoodLink™ indicator outputs for easy visual monitoring of USB traffic. The ISP1122
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has a serial I C-bus interface for external EEPROM access and a reduced frequency
(6 MHz) crystal oscillator. These features allow significant cost savings in system
design and easy implementation of advanced USB functionality into PC peripherals.
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
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I C-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
Product specification
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