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ISP1520

Hi-Speed Universal Serial Bus hub controller

Philips Electronics 

Philips Semiconductors

ISP1520

Hi-Speed USB hub controller

Table 2: Pin description[1]…continued

Symbol[2]

Pin Type Description

RESET_N

31 I

asynchronous reset input; when reset is active, the internal

switch to the 1.5 kΩ 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 the ISP1520 Hub Demo Board User’s Guide

ADOC

32 I

analog or digital overcurrent detect selection input; a LOW

selects the digital mode and a HIGH (3.3 V) selects the

analog mode

XTAL1

33 I

crystal oscillator input (12 MHz)

XTAL2

34 O

crystal oscillator output (12 MHz)

GND

35 -

ground supply

DM2

DP2

36 AI/O downstream facing port 2 D− connection (analog)[3]

37 AI/O downstream facing port 2 D+ connection (analog)[3]

TEST_HIGH 38 -

test pin; connect to 3.3 V

VCC1

GND

39 -

40 -

analog supply voltage 1 (3.3 V)

ground supply

VCC4

GND

41 -

42 -

crystal and PLL supply voltage 4 (3.3 V)

ground supply

DM3

DP3

43 AI/O downstream facing port 3 D− connection (analog)[4]

44 AI/O downstream facing port 3 D+ connection (analog)[4]

VCC2

GND

45 -

46 -

transceiver supply voltage 2 (3.3 V)

ground supply

DM4

DP4

47 AI/O downstream facing port 4 D− connection (analog)[4]

48 AI/O downstream facing port 4 D+ connection (analog)[4]

NOOC

GRN4_N

49 I

50 I/O

no overcurrent protection selection input; connect this pin to

HIGH (3.3 V) to select no overcurrent protection; if no

overcurrent is selected, all OCn_N pins must be connected

to VREF(5V0)

output — green LED port indicator (open-drain) for

downstream facing port 4

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

Table 9

AMB4_N

51 I/O

output — amber LED port indicator (open-drain) for

downstream facing port 4

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

Table 8

GRN3_N

52 I/O

output — green LED port indicator (open-drain) for

downstream facing port 3

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

Table 9

AMB3_N

53 I/O

output — amber LED port indicator (open-drain) for

downstream facing port 3

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

Table 8

9397 750 11689

Product data

Rev. 02 — 04 May 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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