Philips Universal Serial Bus ISP1122 - Manual (Page 28)

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
VBUS
D +
D −
GND
SHIELD
+ 4.50 V(min)
upstream
port
VCC
GND
1
2
3
4
+ 4.40 V
(min)
VBUS
D
+
D −
GND
SHIELD
1
downstream
ports
120
µ F
ferrite bead
+
4.40 V
(min)
VBUS
D
+
D −
GND
SHIELD
2
120
µ F
ferrite bead
+
4.40 V
(min)
VBUS
D
+
D −
GND
SHIELD
3
120
µ F
ferrite bead
+ 4.40 V
(min)
VBUS
D
+
D −
GND
SHIELD
4
120
µ
F
ferrite bead
330 k Ω
(4 × )
low-ohmic
PMOS switch
47 k Ω
0.1 µ F
low-ohmic
PMOS switch
47 k Ω
0.1 µ F
low-ohmic
PMOS switch
47 k Ω
0.1 µ F
low-ohmic
PMOS switch
47 k
Ω
0.1 µ F