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ISL54222A 데이터시트(PDF) 9 Page - Intersil Corporation

부품명 ISL54222A
상세설명  High-Speed USB 2.0 (480Mbps) Multiplexer
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제조업체  INTERSIL [Intersil Corporation]
홈페이지  http://www.intersil.com/cda/home
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ISL54222A 데이터시트(HTML) 9 Page - Intersil Corporation

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9
FN6902.0
May 13, 2009
1.8V to 3.3V, the fault voltage will pass through to the output of
an active switch channel. During the fault condition normal
operation is not guaranteed until the fault is removed. See the
following “USB 2.0 VBUS Short Requirements” section.
The HS1 channel switches are active (turned ON) whenever
the SEL voltage is logic”0”(Low) and the OE voltage is
logic”0”(Low).
The HS2 channel switches are active (turned ON) whenever
the SEL voltage is logic “1” (High) and the OE voltage is
logic “0” (Low).
ISL54222A Operation
The following will discuss using the ISL54222A shown in the
“Application Block Diagram” on page 8.
POWER
The power supply connected at the VDD pin provides the DC
bias voltage required by the ISL54222A part for proper
operation. The ISL54222A can be operated with a VDD
voltage in the range of 1.8V to 3.3V.
A 0.01µF or 0.1µF decoupling capacitor should be
connected from the VDD pin to ground to filter out any power
supply noise from entering the part. The capacitor should be
located as close to the VDD pin as possible.
LOGIC CONTROL
The state of the ISL54222A device is determined by the
voltage at the SEL pin and the OE pin. SEL is only active
when the OE pin is logic “0” (Low). Refer to “Truth Table” on
page 2.
The ISL54222A logic pins are designed to minimize current
consumption when the logic control voltage is lower than the
VDD supply voltage. With VDD = 3.3V and logic pins at 1.4V,
the part typically draws only 6.6µA. With VDD = 1.8V and
logic pins at 1.4V, the part typically draws only 0.2µA. Driving
the logic pins to the VDD supply rail minimizes power
consumption. The logic pins must be driven High or Low and
must not float.
LOGIC CONTROL VOLTAGE LEVELS
With VDD supply voltage in the range of 1.8V to 3.3V the
logic levels are:
OE = Logic “0” (Low) when VOE 0.5V
OE = Logic “1” (High) when VOE 1.4V
SEL = Logic “0” (Low) when VSEL 0.5V
SEL = Logic “1” (High) when VSEL 1.4V
HSD1 USB CHANNEL
If the SEL pin = Logic “0” and the OE pin = Logic “0”,
high-speed Channel 1 will be ON. The HSD1- and HSD1+
switches are ON and the HSD2- and HSD2+ switches are
OFF (high impedance).
When a computer or USB hub is plugged into the common
USB connector and Channel 1 is active, a link will be
established between the USB 1 transceiver section of the
media player and the computer. The device transceiver 1 will
be able to transmit and receive data from the computer.
HSD2 USB Channel
If the SEL pin = Logic “1” and the OE pin = Logic “0”,
high-speed Channel 2 will be ON. The HSD2- and HSD2+
switches are ON and the HSD1- and HSD1+ switches are
OFF (high impedance).
When a USB cable from a computer or USB hub is
connected at the common USB connector and the part has
Channel 2 active, a link will be established between the USB
2 transceiver section of the media player and the computer.
The device transceiver 2 will be able to transmit and receive
data from the computer.
ALL SWITCHES OFF / LOW POWER MODE
If the SEL pin = Logic “0” or Logic “1” and the OE
pin = Logic “1”, all of the switches will turn OFF (high
impedance) and the part will be put in a low power mode. In
this mode the part draws only 1.5µA (max) of current across
the operating temperature range.
The all OFF state can be used to switch between the two
USB sections of the media player. When disconnecting from
one USB device to the other USB device, you can
momentarily put the ISL54222A switch in the “all off” state in
order to get the computer to disconnect from the one device
so it can properly connect to the other USB device when that
channel is turned ON.
USB 2.0 VBUS Short Requirements
The USB 2.0 specification in chapter 7, section 7.1.1 states
a USB device must be able to withstand a VBUS short to the
D+ or D- signal lines when the device is either powered off or
powered on for at least 24 hours. The ISL54222A part has
special fault protection circuitry to meet these short circuit
requirements.
The fault protection circuitry allows the signal pins (D-, D+,
HSD1-, HSD1+, HSD2-, HSD2+) to be driven up to 5.5V
while the VDD supply voltage is in the range of 0V to 3.3V. In
this overvoltage condition, the part draws < 300µA of IDD
current and causes no stress or damage to the IC.
In addition, when VDD is at 0V (ground), all switches are
OFF and the shorted VBUS voltage is isolated from the other
side of the switch.
When VDD is in the range of 1.8V to 3.3V, the shorted VBUS
voltage will pass through to the output of an active (turned
ON) switch channel but not through a turned OFF channel.
Any components connected on the active channel must be
able to withstand the overvoltage condition.
Note: During the fault condition, normal operation of the USB
channel is not guaranteed until the fault condition is
removed.
ISL54222A


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