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TUSB2036 数据表(PDF) 6 Page - Texas Instruments

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部件名 TUSB2036
功能描述  2/3-PORT HUB FOR THE UNIVERSAL SERIAL BUS WITH OPTIONAL SERIAL EEPROM INTERFACE
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

TUSB2036 数据表(HTML) 6 Page - Texas Instruments

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TUSB2036
2/3-PORT HUB FOR THE UNIVERSAL SERIAL BUS
WITH OPTIONAL SERIAL EEPROM INTERFACE
SLLS372 – MARCH 2000
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions (Continued)
TERMINAL
I/O
DESCRIPTION
NAME
VF
I/O
DESCRIPTION
PWRON1 –
PWRON3
9, 13,
17
O
Power-on/-off control signals. PWRON1 – PWRON3 are active low, push-pull outputs. Push-pull outputs
eliminate the pullup resistors which open-drain outputs require. However, the external power switches that
connect to these pins must be able to operate with 3.3-V inputs because these outputs cannot drive 5-V
signals.
RESET
4
I
Reset. RESET is an active low TTL input with hysteresis and must be asserted at power up. When RESET
is asserted, all logic is initialized. Generally, a reset with a pulse width between 100
µs and 1 ms is
recommended after 3.3-V VCC reaching its 90%. The clock signal must be active during the last 60 µs of the
reset window.
SUSPND
32
O
Suspend status. SUSPND is an active high output available for external logic power-down operations. During
the suspend mode, SUSPND is high. SUSPND is low for normal operation.
MODE
31
I
Mode select. When MODE is low, the APLL output clock is selected as the clock source to drive the internal
core of the chip and 6-MHz crystal or oscillator can be used. When MODE is high, the clock on XTAL1/CLK48
is selected as the clock source and 48-MHz oscillator or other on-board clock source can be used.
NP3
24
I
Number of ports is 3. Active low input. A logic 0 configures the system to use 3 ports. A logic 1, configures
the system to use 2 ports.
NPINT1–0
23, 22
I
Number of ports internal to hub system, which are permanently attached (see Table 1)
VCC
3, 25
3.3-V supply voltage
XTAL1/CLK48
30
I
Crystal 1/48-MHz Clock Input. When MODE is low, XTAL1/CLK48 is a 6-MHz crystal input with 50% duty
cycle. An internal APLL generates the 48-MHz and 12-MHz clocks used internally by the ASIC logic. When
MODE is high, XTAL1/CLK48 acts as the input of the 48 MHz clock and the internal APLL logic is bypassed.
XTAL2
29
O
Crystal 2. XTAL2 is a 6-MHz crystal output. This terminal should be left open when using an oscillator.


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