ISP1122BD Datasheet | NXP Semiconductors

ISP1122 Universal Serial Bus stand-alone hub Rev. 03 - 29 March 2000 Product specification 1. General description The ISP1122 is a stand-alone Universal Serial Bus (USB) hub device which plies 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 (VBUS), 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 pliant with the ACPI™, On Now™ 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 Good Link™ indicator outputs for easy visual monitoring of USB traffic. The ISP1122 has a serial I2C-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. 2. Features c c s High performance USB hub device with integrated hub repeater, hub controller, Serial Interface Engine (SIE), data transceivers and 3.3 V voltage regulator s plies with Universal Serial Bus Specification Rev. 1.1 and ACPI, On Now and USB power management requirements s Configurable from 2 to 5 downstream ports with automatic speed detection s Internal power-on reset and low voltage reset circuit s Supports bus-powered, hybrid-powered and self-powered application s Individual or ganged power switching for downstream ports s Individual or global port overcurrent protection with built-in sense circuits s 6 MHz crystal oscillator with on-chip PLL for low EMI s Visual USB...