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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
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
OC4_N 32 AI/I overcurrent sense input for downstream facing port 4
(analog/digital)
PSW4_N 33 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 34 AI/I overcurrent sense input for downstream facing port 3
(analog/digital)
PSW3_N 35 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 36 AI/I overcurrent sense input for downstream facing port 7
(analog/digital)
PSW7_N 37 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 38 AI/I overcurrent sense input for downstream facing port 2
(analog/digital)
PSW2_N 39 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 40 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 V
BUS
through an RC circuit; refer to the schematics in
ISP1521 Hub Demo Board User’s Guide
ADOC 41 I 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 42 I crystal oscillator input (12 MHz)
XTAL2 43 O crystal oscillator output (12 MHz)
GND 44 - ground supply
DM2 45 AI/O downstream facing port 2 D− connection (analog)
[4]
DP2 46 AI/O downstream facing port 2 D+ connection (analog)
[4]
GND 47 - ground supply
DM7 48 AI/O downstream facing port 7 D− connection (analog)
[3]
DP7 49 AI/O downstream facing port 7 D+ connection (analog)
[3]
V
CC1
50 - analog supply voltage 1 (3.3 V)
GND 51 - ground supply
V
CC4
52 - crystal and PLL supply voltage 4 (3.3 V)
GND 53 - ground supply
DM3 54 AI/O downstream facing port 3 D− connection (analog)
[3]
Table 2: Pin description
[1]
…continued
Symbol
[2]
Pin Type Description