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TUSB2040A Datasheet(PDF) 4 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
4-PORT HUB FOR THE UNIVERSAL SERIAL BUS
WITH OPTIONAL SERIAL EEPROM INTERFACE
SLLS288B – FEBRUARY 1998 – REVISED MARCH 1998
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NPT
I/O
DESCRIPTION
BUSPWR/SCL
9
10
I/O
Power source input/EEPROM serial clock. When EXTMEM is low, BUSPWR/SCL is an active
low input that indicates whether the ports and the hub derive power from the bus or the local
supply. When EXTMEM is high, BUSPWR/SCL acts as a tri-state serial clock output to the
EEPROM with a 100
µA internal pulldown. This standard TTL input must not change dynamically
during operation.
DM0
5
2
I/O
Root port USB differential data minus. DM0 paired with DP0 constitutes the upstream USB port.
DM1 – DM4
8, 12,
15, 17
7, 14,
19, 24
I/O
USB differential data minus. DM1 – DM4 paired with DP1 – DP4 support up to four downstream
USB ports.
DP0
4
1
I/O
Root port USB differential data plus. DP0 paired with DM0 constitutes the upstream USB port.
DP1 – DP4
7, 11,
14, 16
6, 13,
18, 23
I/O
USB differential data plus. DP1 – DP4 paired with DM1 – DM4 support up to four downstream
USB ports.
GANGED/SDA
10
11
I/O
Power switching and overcurrent detection mode/EEPROM serial data I/O. When EXTMEM is
low, GANGED/SDA selects between gang or per port switching for the overcurrent detection of
the downstream ports. When EXTMEM is high, GANGED/SDA acts as a tri-state serial data I/O
to and from the EEPROM with a 100
µA internal pull-down. This standard TTL input must not
change dynamically during operation.
GND
6, 24
3, 36
Ground. GND terminals must be tied to ground for proper operation.
EXTMEM
21
32
I
EEPROM read enable. When EXTMEM is low, it disables the serial EEPROM interface of the
device. Pins 9 and 10 are configured as BUSPWR and GANGED, respectively. When EXTMEM
is high, it enables the serial EEPROM interface and pins 9 and 10 are configured as SCL and
SDA, respectively.
OVRCUR1 –
OVRCUR4
3, 1,
26, 19
48, 46,
38, 27
I
Overcurrent indicators. OVRCUR1 – OVRCUR4 are active low, standard TTL inputs. One
overcurrent indicator is available for each of the four downstream ports. In GANGED mode, one
implementation is to tie these inputs together. Alternatively, one OVRCUR input pin may be used
with the remaining OVRCUR pins tied to VCC.
PWRON1 –
PWRON4
2, 28,
25, 20
47, 44,
37, 29
O
Power-on/-off control signals. PWRON1 – PWRON4 are active low, open-drain outputs. One
power-on/-off control switch is used for each of the four downstream ports. In GANGED mode,
all outputs are switched together.
RESET
18
25
I
Reset. RESET is an active low TTL input with hysteresis and must be asserted at power up. When
RESET is asserted, it initializes all logic.
SUSPND
20
O
Suspend status. SUSPND is an active high output that is available for external logic power down
operations. During the SUSPEND mode, SUSPND is high. SUSPND is low for normal operation.
VCC
13, 27
15, 41
3.3-V supply voltage
XTAL1
23
35
I
Crystal 1. XTAL1 is a 48-MHz crystal input with 50% duty cycle. Operation at 48-MHz is four times
the USB full-speed bit rate of 12 Mbps.
XTAL2
22
34
O
Crystal 2. XTAL2 is a 48-MHz crystal output. Operation at 48-MHz is four times the USB full-speed
bit rate of 12 Mbps. This terminal is left open when using an oscillator.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC (see Note 1)
– 0.5 V to 3.8 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, VI
– 0.5 V to VCC + 0.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, VO
–0.5 V to VCC + 0.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, IIK, (VI < 0 V or VI > VCC)
±20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, IOK, (VO < 0 V or VO > VCC)
±20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg
–65
°C to 150°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage levels are with respect to GND.




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