USB2422SLASHMJ datasheet(12/51 Pages) SMSC

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2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Revision 1.0 (06-04-13)

SMSC USB2422

DATASHEET

RBIAS

I-R

USB Transceiver Bias:

A12.0 k

Ω (+/- 1%) resistor is attached from ground to this pin to set

the transceiver’s internal bias settings.

SERIAL PORT INTERFACE

SMBDATA

I/OSD12

System Management Bus Data

NON_REM1

Non-removable Port Strap Option:

This pin is sampled (in conjunction with SUSP_IND/NON_REM0) at

RESET_N negation to determine if ports [2:1] contain permanently

attached (non-removable) devices:

NON_REM[1:0] = 00: all ports are removable

NON_REM[1:0] = 01: port 1 is non-removable

NON_REM[1:0] = 10: ports 1 and 2 are non-removable

NON_REM[1:0] = 11: reserved

See Section 2.5, "Strap Pin Configuration" for details.

SMBCLK/

I/OSD12

System Management Bus Clock

CFG_SEL

Configuration Select:

The logic state of this multifunction pin is internally latched on the

rising edge of RESET_N (RESET_N negation), and will determine the

hub configuration method as described in Table 4.1.

MISC

XTALIN/

CLKIN

ICLKx

24 MHz Crystal or External Clock Input:

This pin connects to either one terminal of the crystal or to an external

24 MHz clock when a crystal is not used.

XTALOUT

OCLKx

Crystal Output:

This is the other terminal of the crystal circuit with 1.2 V p-p output and

a weak (< 1 mA) driving strength. When an external clock source is

used to drive XTALIN/CLKIN, leave this pin unconnected, or use with

appropriate caution.

RESET_N

RESET Input:

The system must reset the chip by driving this input low. The minimum

active low pulse is 1

μs.

IPD

Treat as a no connect pin or connect to ground. No trace or signal

should be routed or attached to this pin.

Table 2.2 USB2422 Pin Descriptions (continued)

SYMBOL

BUFFER

TYPE

DESCRIPTION

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