USB4604 datasheet(64/71 Pages) SMSC

64 / 71 page

USB 2.0 HSIC Hi-Speed 4-Port Hub Controller

Datasheet

Revision 1.0 (06-17-13)

SMSC USB4604

DATASHEET

9.5

AC Specifications

This section details the various AC timing specifications of the device.

9.5.1

Power-On Configuration Strap Valid Timing

Figure 9.1 illustrates the configuration strap timing requirements, in relation to power-on, for

applications where RESET_N is not used at power-on. The operational levels (Vopp) for the external

power supplies are detailed in Section 9.2, "Operating Conditions**," on page 59.

Note: For RESET_N configuration strap timing requirements, refer to Section 9.5.2, "Reset and

Configuration Strap Timing," on page 64.

9.5.2

Reset and Configuration Strap Timing

Figure 9.2 illustrates the RESET_N timing requirements and its relation to the configuration strap

signals. Assertion of RESET_N is not a requirement. However, if used, it must be asserted for the

minimum period specified.

Figure 9.1 Power-On Configuration Strap Valid Timing

Table 9.8 Power-On Configuration Strap Valid Timing

SYMBOL

DESCRIPTION

MIN

TYP

MAX

UNITS

tcsh

Configuration strap hold after external power supplies at

operational levels

1ms

All External

Power Supplies

Vopp

Configuration

Straps

tcsh

USB4604 数据表(PDF) 64 Page - SMSC Corporation

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