USB4604 datasheet(54/62 Pages) MICROCHIP

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USB 2.0 HSIC Hi-Speed 4-Port Hub Controller

Datasheet

DS00001716A-page 54

 2014 Microchip Technology Inc.

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 49.

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

Configuration Strap Timing," on page 54.

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

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