Integrated shift register
    and 8-channel peripheral
    driver.
Intelligent quad high-side
    driver.
Class-D audio amplifier sets
    new standards in efficiency.
Programmable D/A allows
    for speed/power optimization.
Industry's first
    programmable resolution A/D.
High-speed 10-bit A/D with
    glueless DSP interface 90-mA
    loads
16-bit A/D D/A analog
    front-end.
UART provides quad-channel
    integration and 64-byte FIFO
Fully compliant 4-port
    USB hub.
USB power distribution
    features independant switches.
Dual low dropout regulator
    with integrated processor
    resets.
Programmable-sychronous buck
    regulator addresses advanced
    microprocessor power needs.
High performance DSP
    power controller
Low-voltage audio power amps
    designed for stero headphone
    applications.
SOT-23 50mA low-dropout
    regulator.
3-channel power supply
    supervisors.

Product features

• Compliance to USB standard v1.0
• I²C circuitry
• Drop in hardware-only solution
• Integrated USB transceivers
• 3.3-V operation
• Supports self-powered and bus-powered mode
• Characterized for operation from 0° C to 70° C

With USB support built in to Windows(r) 98, users can now connect joysticks, video-conferencing cameras, scanners and other types of peripheral hardware to their PCs, without rebooting. It is also possible to connect more than one monitor to the same system for dual display desktops. Or, USB can be used to pull digital audio signals directly from the Internet, CDs, or DVD and convert them to analog sound in the speaker, rather than through an add-in sound card. This diminishes potential noise pollution from the PC and greatly enhances sound quality.

Designed to provide the interface between these new USB maximizes Windows 98 performance USB peripherals and the host PC is the TUSB2140B, a compound 4-port, standard-compliant USB hub that also adds an embedded function. The embedded function is USB display class compatible, and includes a control endpoint and interrupt endpoint to support USB data transfers. The ’2140B will also be available in a 44-pin PGT (LQFP) package in January 1999.

The associated FIFOs and control registers for these endpoints are fully integrated within the device. In addition, an Inter IC (I²C) 2-wire serial interface is provided for a local microcontroller to access the FIFOs and control registers. It also contains state machine functionality to respond to USB requests providing both quick response time and minimize software overhead in the attached microcontroller.

USB compatible transceivers are provided for all upstream and downstream ports. All external downstream ports support both full and low-speed connection by automatically setting the slew rate according to the speed of the device attached to the port.

To reduce power consumption, the ’2140B supports ganged mode as well as per port mode for power switching and overcurrent conditions, as well as a self-powered and bus-powered mode.

• TUSB2140BN
• TUSB2140BPGT