www.ti.com

Power-Sequencing Guidelines

V

/V

(5 V)

BAT

IN

Ext. Pwr. Mgmt (1.8 V)

TUSB6020: CPEN

V

Power: En1 (5 V)

BUS

3.3 V, 1.5 V LDO: Pgood

TUSB6020: RSTn

LDO Voltage Regulator (1.5 V)

LDO Voltage Regulator (3.3 V)

TUSB6020: IO Interface Status

TUSB6020: GPIO7

(Mode Select)

TUSB6020: GPIO6

(Reference Clock Select)

Signal state cannot be ensured.

Signal state is stable and valid.

NOTE: Host mode and reference clock source selection is latched on RSTn rising edge. No external components are required to select normal

mode and CLKIN as a reference clock source.

IOINTERFACEISNOT INITIALIZED

IOINTERFACEISINITIALIZED

GPIO7 is tied to ground externally for normal device operation

Pulled up by TUSB6020 GPIO6 internal pullup resistor (CLKIN is selected)

Pulled high by TUSB6020

internal pullup

NOTE: CPEN is used to drive the enable of the V

power switch. The TUSB6020 does not power up with CPEN asserted. CPEN is

asserted when TUSB6020 is recognized as an A device.

BUS

Crystal Requirements

Frequency

Frequency Tolerance

TUSB6020

USB 2.0 HIGH-SPEED ON-THE-GO DUAL-ROLE CONTROLLER

SCPS170E – JANUARY 2007 – REVISED MARCH 2008

Figure 1. System Power-Up Sequence

Table 2. INPUT CLOCK REQUIREMENTS

PARAMETER

VALUE

Nominal clock frequency

19.200 (CLKIN), 24.000 (XI)

Frequency accuracy

±100 ppm

Maximum rise/fall time

5 ns (10% to 90%)

Voltage level

1.8 V

Input clock type

Square wave, Sine wave

Duty cycle

40% to 60%

Input capacitance loading

4 pF

–95 dBc at 1 MHz

Jitter

–120 dBc at 100 MHz

The required frequency of oscillation for the crystal can be 19.200 or 24.000 MHz.

Frequency tolerance is the maximum allowable deviation from the nominal crystal frequency at a specified

temperature, usually 25

°C. The recommended frequency tolerance of the crystal over the manufacturing process

is ±50 ppm. The maximum acceptable frequency tolerance of the crystal over the manufacturing process is

±100 ppm.

Copyright © 2007–2008, Texas Instruments Incorporated

Submit Documentation Feedback

13

Product Folder Link(s): TUSB6020