XR

22414

5/13

REV1A

Pin Functions

Pin Number

Pin Name

Type Description

1

OVC2#

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.

2

PWR2#

O

Power enable for port 2 downstream device. Asserted if OVC2# input is asserted in individual power

mode or XR22414 is not configured. Unused when ganged power control mode is selected by

connecting PWR4# to ground.

3

VCC18

PWR

1.8V power input

4

PWR3#

O

Power enable for port 3 downstream device. Asserted if OVC3# input is asserted in individual power

mode or XR22414 is not configured. Unused when ganged power control mode is selected by

connecting PWR4# to ground.

5

OVC3#

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.

6

GND

Ground

7

OVC4#

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.

8

PWR4#

I/O

Power enable for port 4 downstream device. Asserted if OVC4# input is asserted in individual power

mode or XR22414 is not configured. If connected to ground, enables Ganged Power Control Mode and

Global Over-Current Protection mode.

9

VCC18

PWR

1.8V power input

10

GND

PWR

Ground

11

XTALOUT

O

12MHz crystal feedback output

12

XTALIN

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.

13

VCC33

PWR

3.3V power input

14

DM4

I/O

Downstream port 4 USB D- data

15

DP4

I/O

Downstream port 4 USB D+ data

16

GND

PWR

Ground

17

DM3

I/O

Downstream port 3 USB D- data

18

DP3

I/O

Downstream port 3 USB D+ data

19

VCC33

PWR

3.3V power input

20

DM2

I/O

Downstream port 2 USB D- data

21

DP2

I/O

Downstream port 2 USB D+ data

22

GND

PWR

Ground

23

DM1

I/O

Downstream port 1 USB D- data

24

DP1

I/O

Downstream port 1 USB D+ data

25

GND

PWR

Ground

26

1V8_OUT

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

27

VCC33

PWR

3.3V power input

28

REXT

I

External bias resistor. Connect 2.7kOhm 1% resistor from this pin to GND

29

VCC18

PWR

1.8V power input

30

UP_DM

I/O

Upstream port USB D- data

31

UP_DP

I/O

Upstream port USB D+ data