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TUSB2040A Datasheet(PDF) 2 Page - Texas Instruments

Part No. TUSB2040A
Description  4-PORT HUB FOR THE UNIVERSAL SERIAL BUS WITH OPTIONAL SERIAL EEPROM INTERFACE
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TUSB2040A Datasheet(HTML) 2 Page - Texas Instruments

 
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TUSB2040A
4-PORT HUB FOR THE UNIVERSAL SERIAL BUS
WITH OPTIONAL SERIAL EEPROM INTERFACE
SLLS288B – FEBRUARY 1998 – REVISED MARCH 1998
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
The TUSB2040A supports bus-power and self-power modes. The power switching to the downstream ports can
either be controlled individually or ganged using external devices to switch power and to detect overcurrent
conditions. Outputs from the external power devices provide overcurrent inputs to the TUSB2040A OVRCUR
pins and in the case of an overcurrent condition, the corresponding PWRON pins will be disabled by the
TUSB2040A. In the GANGED operation, all PWRON signals transition simultaneously, and any OVRCUR input
can be used.
The hub requires a 48-MHz clock signal to sample data from the upstream port and generate a synchronized
12-MHz USB clock signal. The hub supports the flexibility to use any device that generates a 48-MHz clock.
Because the majority of oscillators are active devices, the low power suspend mode of the TUSB2040A will not
function because there is no way to stop the oscillator from driving the internal clock. An oscillator with a TTL
output not exceeding 3.6 V can be used by connecting its output to the XTAL1 terminal and leaving the XTAL2
terminal open. For crystal or resonator implementations, use the XTAL1 terminal as the input and the XTAL2
terminal as the feedback path. Because the crystal is required to resonate at 48 MHz, a tuning circuit as shown
in Figure 8 may be required.
The upstream port and all downstream ports are USB-compliant transceivers. Every downstream port supports
both full-speed and low-speed connections by automatically setting the slew rate according to the speed of the
device attached to the port.


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