ISL54220IUZ Intersil, ISL54220IUZ Datasheet - Page 10

• Manufacturer Part Number: ISL54220IUZ
• Description: IC USB SWITCH DUAL SPDT 10MSOP
• Manufacturer: Intersil

Specifications of ISL54220IUZ

• Function: USB Switch
• Circuit: 2 x SPDT
• On-state Resistance: 8 Ohm
• Voltage Supply Source: Single Supply
• Voltage - Supply, Single/dual (±): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

and the fault voltage is isolated from the other side of the
switch. When V
fault voltage will pass through to the output of an active
switch channel.
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).
ISL54220 Operation
The following will discuss using the ISL54220 shown in
the “Application Block Diagram” on page 9.
POWER
The power supply connected at the VDD pin provides the
DC bias voltage required by the ISL54220 part for proper
operation. The ISL54220 can be operated with a VDD
voltage in the range of 2.7V to 5.5V. When used in a USB
application, the VDD voltage should be kept in the range
of 3.0V to 5.5V to ensure you get the proper signal levels
for good signal quality.
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.
In a typical application, V
2.8V to 4.3V and will be connected to the battery or
LDO of the portable media device.
LOGIC CONTROL
The state of the ISL54220 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 ISL54220 logic pins are designed to minimize
current consumption when the logic control voltage is
lower than the V
logic pins at 1.4V the part typically draws only 6.6µA.
With V
draws only 0.2µA. Driving the logic pins to the V
supply rail minimizes power consumption.
The logic pins must be held High or Low and must not
float.
Logic Control Voltage Levels
With V
logic levels are:
OE = Logic “0” (Low) when V
OE = Logic “1” (High) when V
SEL = Logic “0” (Low) when V
SEL = Logic “1” (High) when V
DD
DD
= 4.3V and logic pins at 2.6V, the part typically
supply voltage in the range of 2.7V to 3.6V the
DD
DD
is in the range of 2.7V to 5.5V the
supply voltage. With V
10
DD
OE ≤
OE ≥
will be in the range of
SEL ≤
SEL ≥
0.5V
1.4V
0.5V
1.4V
DD
= 3.6V and
DD
ISL54220
With V
logic levels are:
OE = Logic “0” (Low) when V
OE = Logic “1” (High) when V
SEL = Logic “0” (Low) when V
SEL = Logic “1” (High) when V
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 one is active, a link
will be established between the USB 1 driver section of
the media player and the computer. The device will be
able to transmit and receive data from the computer at a
data rate of 480Mbps.
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 driver section of the media player and the
computer. The device will be able to transmit and receive
data from the computer at a data rate of 480Mbps.
All Switches OFF 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).
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 ISL54220 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 V
The USB specification in section 7.1.1 states a USB
device must be able to withstand a V
or D- signal lines when the device is either powered off or
powered on for at least 24 hours. The ISL54220 part has
special fault protection circuitry to meet these short
circuit requirements.
The fault protection circuitry allows the signal pins
(D-, D+, HS1D-, HS1D+, HS2D-, HS2D+) to be driven
up to 5.5V while the V
0V to 5.5V. In this overvoltage condition the part draws
<500µA of current and causes no stress/damage to the
IC.
DD
supply voltage in the range of 4.3V to 5.5V the
BUS
Short Requirements
DD
supply voltage is in the range of
OE ≤
OE ≥
SEL ≤
SEL ≥
0.8V
2.0V
BUS
0.8V
2.0V
short to the D+
February 4, 2010
FN6819.1