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ISP1122A

Universal Serial Bus stand-alone hub

Philips Electronics 

Philips Semiconductors

ISP1122A

USB stand-alone hub

9397 750 06986

Preliminary specification

Table 2: Pin description for SO32 and SDIP32…continued

Symbol [1]

Pin Type Description

OC3

9

AI/I overcurrent sense input for downstream port 3 (analog [5])

OC4

10 AI/I overcurrent sense input for downstream port 4 (analog [5])

OC5/GOC [3] 11

AI/I modes 5, 7: overcurrent sense input for downstream port 5

(analog [5])

modes 0, 1, 3: global overcurrent sense input (analog [5])

DM4

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

DP4

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

SP/BP

14 I

selects power mode:

self-powered: connect to VDD (local power supply); also use

this mode for hybrid-powered operation

bus-powered: connect to GND; disable downstream port 5 to

meet supply current requirements [4]

HUBGL

15 O

PSW3/GL3 [3] 16 O

hub GoodLink LED indicator output (open-drain, 6 mA);

to connect an LED use a 330 Ω series resistor; if unused

connect to VCC via a 10 kΩ resistor

modes 4 to 6: power switch control output for downstream

port 3 (open-drain, 6 mA)

modes 0 to 3, 7: GoodLink LED indicator output for

downstream port 3 (open-drain, 6 mA); to connect an LED

use a 330 Ω series resistor

PSW4/GL4 [3] 17 O

modes 4 to 6: power switch control output for downstream

port 4 (open-drain, 6 mA)

modes 0 to 3, 7: GoodLink LED indicator output for

downstream port 4 (open-drain, 6 mA); to connect an LED

use a 330 Ω series resistor

PSW5/GL5/ 18 O

GPSW [3]

mode 5: power switch control output for downstream port 5

(open-drain, 6 mA)

modes 3, 7: GoodLink LED indicator output for downstream

port 5 (open-drain, 6 mA); to connect an LED use a 330 Ω

series resistor

modes 0 to 2: gang mode power switch control output

(open-drain, 6 mA)

XTAL1

19 I

crystal oscillator input (6 MHz)

XTAL2

20 O

crystal oscillator output (6 MHz)

RESET [2]

21 I

reset input (Schmitt trigger); a LOW level produces an

asynchronous reset; connect to VCC for power-on reset

(internal POR circuit)

OPTION/SCL 22

I/O mode selection input; also functions as I2C-bus clock output

(open-drain, 6 mA)

INDV/SDA

23 I/O selects individual (HIGH) or global (LOW) power switching

and overcurrent detection; also functions as bidirectional

I2C-bus data line (open-drain, 6 mA)

DM5

24 AI/O downstream port 5 D− connection (analog) [4]

DP5

25 AI/O downstream port 5 D+ connection (analog) [4]

DM1

26 AI/O downstream port 1 D− connection (analog) [6]

DP1

27 AI/O downstream port 1 D+ connection (analog) [6]

Rev. 01 — 27 March 2000

© Philips Electronics N.V. 2000. All rights reserved.

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