Smsc LAN9512 User Manual download pdf (Page 42)

USB Hub with Integrated 10/100 Ethernet Controller

Datasheet

Revision 1.0 (04-20-09) 42 SMSC LAN9512

DATASHEET

4.5 AC Specifications

This section details the various AC timing specifications of the LAN9512.

Note: The USBDP and USBDM pin timing adheres to the USB 2.0 specification. Refer to the

Universal Serial Bus Revision 2.0 specification for detailed USB timing information.

4.5.1 Equivalent Test Load

Output timing specifications assume the 25pF equivalent test load illustrated in Figure 4.1 below.

4.5.2 Reset Timing

The nRESET pin input assertion time must be a minimum of 1 μS. Assertion of nRESET is not a

requirement. However, if used, it must be asserted for the minimum period specified.

Figure 4.1 Output Equivalent Test Load

25 pF

OUTPUT

1 2 ... 37 38 39 40 41 42 43 44 45 46

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Smsc LAN9512 User Manual Page 42