AT43312

Features:

• Full compliance with USB spec Rev 1.0
• Four downstream ports
• Full speed and low speed data transfers
• Self-Powered or Bus-Powered modes of operation
• Per port overcurrent monitoring
• Individual port power switch control
• USB connection status indicators


Pinout




Specifications

Operating Temperature............... -55°C to +125°C Storage Temperature ................. -65°C to +150°C Voltage on any pin with Respect to Ground ...............................-1.0V to 7.0V Maximum Operating Voltage.............................. 6.6V DC Output Current.......................................... 16 mA

Description

The AT43312 is a 5 port USB hub chip supporting one upstream and four downstream ports. The AT43312 connects to an upstream hub or Host/Root Hub via Port0 and the other ports connect to external downstream USB devices. The hub re-transmits the USB differential signal between Port0 and Ports[1:4] in both directions.A USB hub with the AT43312 can operate as a bus-powered or self-powered through chip's power mode configuration pin. The AT-43312 is pin- and function-compatible with the AT43311 and can be used as a replacement for the AT43310 with one pin modification.

The AT43312 supports the 12 Mb/s full-speed as well as 1.5 Mb/s slow-speed USB transactions. To reduce EMI, the AT43312's oscillator frequency is 6 MHz even though some internal circuitry operates at 48 MHz.