ISL54401IRZ Intersil, ISL54401IRZ Datasheet - Page 11

• Manufacturer Part Number: ISL54401IRZ
• Description: IC SWITCH USB/AUDIO 10-TDFN
• Manufacturer: Intersil

Specifications of ISL54401IRZ

• Function: USB Switch
• Circuit: 2 x SPDT
• On-state Resistance: 6 Ohm
• Voltage Supply Source: Single Supply
• Voltage - Supply, Single/dual (±): 2.5 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-TDFN Exposed Pad
• Rohs Compliant: YES
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

where the two SPDT switches work in tandem, the ISL54402
gives you independent control over each SPDT switch.
USB Switches
The two NO (normally open) USB switches (D+, D-, NOx)
are 5Ω bidirectional switches that are designed to pass low
speed and full-speed USB differential signals typically in the
range of 0V to 3.6V. The switches have low capacitance and
high bandwidth to pass USB full-speed signals (12Mbps)
with minimum edge and phase distortion to meet USB 2.0
signal quality specifications. See eye diagram Figure 11 on
page 13.
For the ISL54400 and ISL54401 parts, the maximum signal
range for the USB switches is from -1.5V to V
signal voltage should not be allowed to exceed the V
voltage rail or go below ground by more than -1.5V.
For the ISL54402 part, the maximum signal range is from
-1.5V to V
exceed the V
than -1.5V.
When using the ISL54400 and ISL54401 parts, the USB
switches are active (turned ON) whenever the V
is
V
Note: Whenever the USB switches are ON the audio drivers
of the CODEC, connected at R and L (pins 6 and 7), need to
be at AC or DC ground or floating to keep from interfering
with the data transmission.
When using the ISL54402 part, the NO1 USB switch is
active (turned ON) whenever logic pin IN1 (pin 10) is HIGH.
The NO2 USB switch is active (turned ON) whenever the
logic pin IN2 (pin 2) is HIGH. Unlike the ISL54400 and
ISL54401 parts where the two SPDT switches work in
tandem, the ISL54402 gives you independent control over
each SPDT switch.
ISL54400 and ISL54401 Operation
The ISL54400 and ISL54401 function the same except the
ISL54401 does not have the V
that follows pertains to both devices and will discuss using the
parts in the typical application shown in the block diagram on
page 10.
LOGIC CONTROL
The state of the ISL54400 and ISL54401 devices are
determined by the voltage at the V
pin is internally pulled low and can be left floating.
If V
the part will be in the Audio mode. In Audio mode the L (left)
and R (right) 1Ω audio switches are ON and the D- and D+
5Ω switches are OFF (high impedance). In this state, power
to the part will be provided by the DC voltage connected at
the V
BUS
≥
BUS
to V
DD
is floating the USB switches are OFF.
DD
(pin 2) is floating or the V
pin (pin 1). In a typical application V
DD
+ 0.8V. V
. The signal voltage should not be allowed to
DD
voltage rail or go below ground by more
BUS
is internally pulled low, so when
11
TERM
BUS
BUS
feature. The discussion
voltage
pin (pin 2). The V
ISL54400, ISL54401, ISL54402
DD
BUS
≤
will be in the
BUS
V
DD
. The
voltage
BUS
+ 0.2V
BUS
range of 2.5V to 3.6V and will be connected to the battery or
LDO of the MP3 player or cellphone. When a headphone is
plugged into the common connector, nothing gets connected
at the V
ISL54401 parts remain in the audio mode and the MP3
player or cellphone audio drivers can drive the headphones
and play music.
If V
will go into USB mode. In USB mode the D- and D+ 5Ω
switches are ON and the L and R 1Ω audio switches are
OFF (high impedance). In this state the part will be powered
by the voltage connected at the V
USB cable from a computer or USB hub is connected at the
common connector the V
4.4V and 5.25V. The ISL54400 and ISL54401 parts will go
into the USB mode. In USB mode the computer or USB hub
transceiver and the MP3 player or cellphone USB
transceiver are connected and digital data will be able to be
transmitted back and forth.
When the USB cable is disconnected the switch
automatically turns the D+ and D- switches OFF and turns
the L and R audio switches ON.
POWER
In audio mode the power supply connected at V
provides power to the ISL54400 and ISL54401 parts. Its
voltage should be kept in the range of 2.5V to 3.6V when
used in a USB/Audio application to ensure you get proper
switching when the V
In USB mode power for the ISL54400 and ISL54401 parts is
provided from the V
the computer or USB hub. Its voltage will be between 4.4V
and 5.25V.
V
When a USB cable from a computer is connected to a USB
device a V
indicating pull-up resistor to properly terminate the bus and
identify whether the USB device is a full-speed or low-speed
device to facilitate proper digital transmission. When the
cable is removed from the device this V
be disconnected from the speed indicating pull-up resistor.
The ISL54400 device can perform this operation.
When V
(pin 10) outputs an open circuit voltage equal to the voltage
at the V
state.
The ISL54400 V
approximately equal to 5.3kΩ. For a full speed USB
application, it is recommended you use a 3kΩ ±5% speed
indicating pull-up resistor. When the USB bus is in the idle
state, a 3kΩ ±5% resistor will put the D+ line voltage in the
range of 2.7V to 3.6V as required by the USB specification.
For low-speed USB application, it is recommended you use
TERM
BUS
BUS
OPERATION (ISL54400 ONLY)
BUS
DD ≥
(pin 2) voltage is greater than V
TERM
pin (it’s floating) and the ISL54400 and
pin. Otherwise the V
2.5V and V
TERM
voltage must be applied to a speed
BUS
BUS
circuitry has an internal series resistor
line from the host USB controller of
BUS ≥
BUS
voltage is at its lower limit of 4.4V.
voltage is driven to between
V
DD
TERM
BUS
+ 0.8V, the V
pin (pin 2). When a
pin will be in a HI-Z
TERM
DD
by 0.8V the part
voltage must
DD
TERM
July 12, 2006
(pin 1)
FN6240.3
pin