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Philips Semiconductors
ISP1122
USB stand-alone hub
Product specification Rev. 03 — 29 March 2000 26 of 48
9397 750 07002
© Philips Electronics N.V. 2000. All rights reserved.
Power switches 1 to 5 are low-ohmic PMOS devices as specified in Section 12.2.
Fig 10. Mode 5: self-powered hub; individual port power switching; individual overcurrent detection.
MGR784
handbook, full pagewidth
INDV
OPTION
PSW1/GL1
PSW5/GL5/GPSW
PSW4/GL4
PSW3/GL3
SP/BP
OC5/GOC
PSW2/GL2
OC1
OC2
OC3
OC4
5 V
POWER SUPPLY
± 3%
1
−
+
V
BUS
D+
D−
GND
SHIELD
+4.85 V(min)
+4.85 V(min)
+4.75 V
(min)
1
2
V
BUS
D+
D−
GND
SHIELD
+4.75 V
(min)
2
3
3
V
BUS
D+
D−
GND
SHIELD
+4.75 V
(min)
V
CC
GND
330 kΩ
(5×)
100 Ω
to
1 kΩ
4
5
V
BUS
D+
D−
GND
SHIELD
+4.75 V
(min)
4
120
µF
V
BUS
D+
D−
GND
SHIELD
+4.75 V
(min)
5
ferrite bead
downstream
ports
ISP1122
120
µF
ferrite bead
120
µF
ferrite bead
120
µF
ferrite bead
120
µF
ferrite bead
low-ohmic
PMOS switch
47 kΩ
0.1 µF
low-ohmic
PMOS switch
47 kΩ
0.1 µF
low-ohmic
PMOS switch
47 kΩ
0.1 µF
low-ohmic
PMOS switch
47 kΩ
0.1 µF
low-ohmic
PMOS switch
47 kΩ
0.1 µF