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Application Note 1450
The USB switches are bi-directional, which allows the host
(computer) and downstream USB device to both send and
receive data.
High-Speed Switches
The four HSx switches (HSD1-, HSD1+, HSD2-, HSD2+) are
bi-directional switches that can pass rail-to-rail signals.
When powered with a 1.8V supply, these switches have a
nominal r ON of 5.7 Ω over the signal range of 0V to 400mV
with a r ON flatness of 0.60 Ω . The r ON matching between the
HSDx- and HSDx+ switches over this signal range is only
0.072 Ω ensuring minimal impact by the switches to USB
high speed signal transitions. As the signal level increases,
the r ON switch resistance increases. At signal level of 1.8V
the switch resistance is nominally 12 Ω .
However, in the event that the USB 5.25V V BUS voltage gets
shorted to one or both of the D-/D+ pins, the ISL54222A has
special fault protection circuitry to prevent damage to the
ISL54222A part. The fault circuitry allows the signal pins (D-,
D+, HS1D-, HS1D+, HS2D-, HS2D+) to be driven up to 5.5V
while the V DD supply voltage is in the range of 0V to 3.3V. In
this condition, the part draws < 300μA of current and causes
no stress to the IC. In addition, when V DD is at 0V, (ground)
all switches are OFF, and the fault voltage is isolated from
the other side of the switch. When V DD is in the range of
1.8V to 3.3V, the fault voltage will pass through to the output
of an active switch channel.
TABLE 1. BOARD COMPONENT DEFINITIONS
DESIGNATOR DESCRIPTION
The HSx switches were specifically designed to pass USB
2.0 high-speed (480Mbps) differential signals typically in the
range of 0V to 400mV. They have low capacitance and high
bandwidth to pass the USB high-speed signals with
minimum edge and phase distortion to meet USB 2.0 high
speed signal quality specifications.
The HSx switches can also pass USB full-speed signals
(12Mbps) with minimal distortion and meet all the USB
requirements for USB 2.0 full-speed signaling.
The maximum normal operating signal range for the HSx
switches is from 0V to 3.3V. The signal voltage should not be
U1
J5
J6, J7
J1
J2
J4
J3
J8
J9
ISL54222AIRUZ IC
“B” type USB Receptacle
“A” type USB Receptacle
V DD Positive Connection
V DD Negative Connection
SEL Logic Control
OE Logic Control
V BUS Voltage for Highspeed Device 1
V BUS Voltage for Highspeed Device 2
allow to exceed the 3.3V or go below ground by more than
JP1, JP2, JP3 D-/D+ Differential Probe Connection
-0.3V for normal operation.
3
JP4, JP5
Host Controller V BUS Jumper
AN1450.1
July 24, 2009
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