TUSB8040RKMR datasheet(10/33 Pages) TI

10 / 33 page

TUSB8040

SLLSE42F

– SEPTEMBER 2010 – REVISED OCTOBER 2011

www.ti.com

2.1

Clock and Reset Signals

Table 2-1. Clock and Reset Signals

PIN NO.

SIGNAL NAME

TYPE

DESCRIPTION

PFP

RKM

Global power reset. This reset brings all of the TUSB8040 internal registers to their

default states. When GRSTz is asserted, the device is completely nonfunctional.

GRSTz

I, PU

A18

GRSTz should be asserted a minimum of 3 ms after all power rails are valid at the

device.

Crystal input. This terminal is the crystal input for the internal oscillator. The input

A49

may alternately be driven by the output of an external oscillator. When using a

crystal a 1-M

Ω feedback resistor is required between XI and XO.

Crystal output. This terminal is crystal output for the internal oscillator. If XI is

A48

driven by an external oscillator this pin may be left unconnected. When using a

crystal a 1-M

Ω feedback resistor is required between XI and XO.

Oscillator return. If using a crystal, the load capacitors should use this signal as the

VSSOSC

B45

return path and it should not be connected to the PCB ground. If using an

oscillator, this terminal should be connected to PCB Ground.

2.2

USB Upstream Signals

Table 2-2. USB Upstream Signals

PIN NO.

SIGNAL NAME

TYPE

DESCRIPTION

PFP

RKM

USB_SSTXP_UP

B39

USB SuperSpeed transmitter differential pair (positive)

USB_SSTXM_UP

A42

USB SuperSpeed transmitter differential pair (negative)

USB_SSRXP_UP

A44

USB SuperSpeed receiver differential pair (positive)

USB_SSRXM_UP

B40

USB SuperSpeed receiver differential pair (negative)

USB_DP_UP

I/O

A46

USB high-speed differential transceiver (positive)

USB_DM_UP

I/O

B42

USB high-speed differential transceiver (negative)

Precision resistor reference. A 9.09-K

Ω ±1% resistor should be connected between

USB_R1

A50

USB_R1 and USB_R1RTN.

USB_R1RTN

B47

Precision resistor reference return

USB upstream port power monitor. The VBUS detection requires a voltage divider.

USB_VBUS

B44

The signal USB_VBUS must be connected to VBUS through a 90.9-K

Ω ±1% resistor,

and to ground through a 10-K

Ω ±1% resistor from the signal to ground.

PIN DESCRIPTIONS

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