XR22417 Datasheet, PDF (5/17 Pages) Exar Corporation – USB 2.0 7-Port Hub

XR22417
Pin Functions (Continued)
LQFP-48 LQFP-64
Pin Number Pin Number
Pin Name
Type Description
24
32
GND
PWR Ground.
25
33
1V8_OUT
PWR
1.8V power output from internal 3.3V to 1.8V regulator. Must be decoupled with minimum
of 10 µF.
26
34
VCC33
PWR 3.3V power input.
27
35
REXT
I
External bias resistor. Connect 2.7kΩ 1% resistor from this pin to GND.
28
36
VCC18
PWR 1.8V power input.
-
37
GND
PWR Ground.
29
38
UP_DM
I/O Upstream port USBD- data.
30
39
UP_DP
I/O Upstream port USBD+ data.
31
40
VCC33
PWR 3.3V power input.
32
41
DM5
I/O Downstream port 5 USBD- data.
33
42
DP5
I/O Downstream port 5 USBD+ data.
-
43
GND
PWR Ground.
34
44
DM6
I/O Downstream port 6 USBD- data.
35
45
DP6
I/O Downstream port 6 USBD+ data.
36
46
VCC33
PWR 3.3V power input.
37
47
DM7
I/O Downstream port 7 USBD- data.
38
48
DP7
I/O Downstream port 7 USBD+ data.
39
49
GND
PWR Ground.
40
50
EXT_RST#
I
External reset input, active low. Must be asserted for a minimum of 10 µS. This pin
requires an external pull-up resistor to 3.3V.
Active high, indicates connection to USB host. Must connect to VBUS power input from
41
51
VBUS_SENSE
I
USB host through a series 10kΩ resistor. A 100kΩ pull-down resistor and 100nF shunt
capacitance are also required on this pin.
-
52
PWR7#
OD
Power enable for port 7 downstream device, active low. Asserted if OVC7# input is
asserted or device is not configured.
-
53
OVC7#
I
Downstream port 7 over current indicator, active low.
-
54
PWR6#
OD
Power enable for port 6 downstream device, active low. Asserted if OVC6# input is
asserted or device is not configured.
-
55
OVC6#
I
Downstream port 7 over current indicator, active low.
42
56
VCC33
PWR 3.3V power input.
-
57
PWR5#
OD
Power enable for port 5 downstream device. Asserted if OVC5# input is asserted or
device is not configured.
NOTE:
Type: I = Input, O = Output, I/O = Input/Output, PWR = Power, OD = Open-Drain.
REV1A
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