XR22414DS Datasheet, PDF (5/13 Pages) Exar Corporation – USB 2.0 4-Port MTT Hub

XR22414
Pin Functions
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Pin Name
OVC2#
PWR2#
VCC18
PWR3#
OVC3#
GND
OVC4#
PWR4#
VCC18
GND
XTALOUT
XTALIN
VCC33
DM4
DP4
GND
DM3
DP3
VCC33
DM2
DP2
GND
DM1
DP1
GND
1V8_OUT
VCC33
REXT
VCC18
UP_DM
UP_DP
Type Description
I
Downstream port 2 over current indicator, active low. If global over-current protection is selected by
connecting PWR4# to ground, this pin is unused and should be tied to ground.
Power enable for port 2 downstream device. Asserted if OVC2# input is asserted in individual power
O mode or XR22414 is not configured. Unused when ganged power control mode is selected by
connecting PWR4# to ground.
PWR 1.8V power input
Power enable for port 3 downstream device. Asserted if OVC3# input is asserted in individual power
O mode or XR22414 is not configured. Unused when ganged power control mode is selected by
connecting PWR4# to ground.
I
Downstream port 3 over current indicator, active low. If global over-current protection is selected by
connecting PWR4# to ground, this pin is unused and should be tied to ground.
Ground
I
Downstream port 4 over current indicator, active low. If global over-current protection is selected by
connecting PWR4# to ground, this pin is unused and should be tied to ground.
Power enable for port 4 downstream device. Asserted if OVC4# input is asserted in individual power
I/O mode or XR22414 is not configured. If connected to ground, enables Ganged Power Control Mode and
Global Over-Current Protection mode.
PWR 1.8V power input
PWR Ground
O 12MHz crystal feedback output
I
12MHz +/- 50 ppm crystal input with load capacitance rating of 16-20pF. An external 3.3V clock may be
used instead on on XTALIN leaving XTALOUT unconnected.
PWR 3.3V power input
I/O Downstream port 4 USB D- data
I/O Downstream port 4 USB D+ data
PWR Ground
I/O Downstream port 3 USB D- data
I/O Downstream port 3 USB D+ data
PWR 3.3V power input
I/O Downstream port 2 USB D- data
I/O Downstream port 2 USB D+ data
PWR Ground
I/O Downstream port 1 USB D- data
I/O Downstream port 1 USB D+ data
PWR Ground
PWR
1.8V power output from internal 3.3V to 1.8V regulator, may be used to power VCC18 power inputs.
Must be decoupled with minimum of 10uF
PWR 3.3V power input
I External bias resistor. Connect 2.7kOhm 1% resistor from this pin to GND
PWR 1.8V power input
I/O Upstream port USB D- data
I/O Upstream port USB D+ data
REV1A
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