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Philips Semiconductors
ISP1122
USB stand-alone hub
Product specification Rev. 03 — 29 March 2000 28 of 48
9397 750 07002
© Philips Electronics N.V. 2000. All rights reserved.
Power switches 1 to 4 are low-ohmic PMOS devices as specified in Section 12.2.
Fig 12. Mode 4: bus-powered hub; individual port power switching; individual overcurrent detection.
handbook, full pagewidth
MGR786
INDV
OPTION
PSW1/GL1
PSW5/GL5/GPSW
PSW4/GL4
PSW3/GL3
SP/BP
OC5/GOC
PSW2/GL2
OC1
OC2
OC3
OC4
ISP1122
V
BUS
D+
D−
GND
SHIELD
+4.50 V(min)
upstream
port
V
CC
GND
1
2
3
4
+4.40 V
(min)
V
BUS
D+
D−
GND
SHIELD
1
downstream
ports
120
µF
ferrite bead
+4.40 V
(min)
V
BUS
D+
D−
GND
SHIELD
2
120
µF
ferrite bead
+4.40 V
(min)
V
BUS
D+
D−
GND
SHIELD
3
120
µF
ferrite bead
+4.40 V
(min)
V
BUS
D+
D−
GND
SHIELD
4
120
µF
ferrite bead
330 kΩ
(4×)
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