USB3803 datasheet(10/99 Pages) MICROCHIP

10 / 99 page

USB3803

DS00001691B-page 10

 2014-2015 Microchip Technology Inc.

3.3

Pin Descriptions

This section provides a detailed description of each signal. The signals are arranged in functional groups according to

their associated interface.

The terms assertion and negation are used. This is done to avoid confusion when working with a mixture of “active low”

and “active high” signal. The term “assert”, or “assertion” indicates that a signal is active, independent of whether that

level is represented by a high or low voltage. The term “negate”, or “negation” indicates that a signal is inactive.

3.3.1

PIN DEFINITION

TABLE 3-1:

PIN DESCRIPTIONS

Name

Symbol

Type

Description

Upstream USB 2.0 / Bypass Interface

USB Bus Data

USBUP_DP

USBUP_DM

A-I/O

These pins connect to the upstream USB bus data

signals (Host port, or upstream hub)

Bypass Select for Analog

Switch

BYPASS_N

Control signal to select between Hub Mode and

Bypass Mode. When asserted low, the device transi-

tions to Bypass Mode, connects the Bypass Port to

the upstream USB Port, places Port 1 and Port 2 in

high impedance state, and places the core logic in a

reduced power state. When negated high, the device

transitions to HUB MODE and enables operation as a

USB hub.

Note:

Bypass mode is only available in the

USB3803C. For the USB3803B, this pin

must always be driven high.

Downstream USB 2.0 / Bypass Interface

High-Speed USB Data

Port Disable Strap Option

USBDN_DP[2:1]

USBDN_DM[2:1]

A-I/O

These pins connect to the downstream USB periph-

eral devices attached to the hub’s ports

Downstream Port Disable Strap option:

This pin will be sampled at RESET_N negation to

determine if the port is disabled.

Both USB data pins for the corresponding port must

be tied to VDD33_BYP to disable the associated

downstream port.

USB3803 Datasheet(PDF) 10 Page - Microchip Technology

USB3803 Datasheet(HTML) 10 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99

Datasheet Download

Link URL