ISP1521 datasheet(7/53 Pages) PHILIPS

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Philips Semiconductors

ISP1521

Hi-Speed USB hub controller

Product data

Rev. 03 — 24 November 2004

7 of 53

9397 750 13702

OC4_N

AI/I

overcurrent sense input for downstream facing port 4

(analog/digital)

PSW4_N

I/O

output — power switch control output (open-drain) with an

internal pull-up resistor for downstream facing port 4

input — function of the pin when used as an input is given in

Table 5

OC3_N

AI/I

overcurrent sense input for downstream facing port 3

(analog/digital)

PSW3_N

I/O

output — power switch control output (open-drain) with an

internal pull-up resistor for downstream facing port 3

input — function of the pin when used as an input is given in

Table 5

OC7_N

AI/I

overcurrent sense input for downstream facing port 7

(analog/digital)

PSW7_N

I/O

output — power switch control output (open-drain) with an

internal pull-up resistor for downstream facing port 7

input — function of the pin when used as an input is given in

Table 5

OC2_N

AI/I

overcurrent sense input for downstream facing port 2

(analog/digital)

PSW2_N

I/O

output — power switch control output (open-drain) with an

internal pull-up resistor for downstream facing port 2

input — function of the pin when used as an input is given in

Table 5

RESET_N

asynchronous reset input; when reset is active, the internal

switch to the 1.5 k

Ω external resistor is opened, and all pins

DPn and DMn are three-state; it is recommended that you

connect to VBUS through an RC circuit; refer to the schematics in

ISP1521 Hub Demo Board User’s Guide

ADOC

analog or digital overcurrent detect selection input; a LOW

selects digital mode and a HIGH (3.3 V or 5.0 V) selects analog

mode

XTAL1

crystal oscillator input (12 MHz)

XTAL2

crystal oscillator output (12 MHz)

GND

ground supply

DM2

AI/O

downstream facing port 2 D

− connection (analog)[4]

DP2

AI/O

downstream facing port 2 D+ connection (analog)[4]

GND

ground supply

DM7

AI/O

downstream facing port 7 D

− connection (analog)[3]

DP7

AI/O

downstream facing port 7 D+ connection (analog)[3]

VCC1

analog supply voltage 1 (3.3 V)

GND

ground supply

VCC4

crystal and PLL supply voltage 4 (3.3 V)

GND

ground supply

DM3

AI/O

downstream facing port 3 D

− connection (analog)[3]

Table 2:

Pin description[1]…continued

Symbol[2]

Type Description

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