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PDF ISL54225 Data sheet ( Hoja de datos )
| Número de pieza | ISL54225 | |
| Descripción | High-Speed USB 2.0 (480Mbps) Multiplexer | |
| Fabricantes | Intersil | |
| Logotipo |  |
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High-Speed USB 2.0 (480Mbps) Multiplexer with
Overvoltage Protection (OVP)
ISL54225
The Intersil ISL54225 is a single supply dual 2:1
multiplexer that can operate from a single 2.7V to 5.25V
supply. It contains two SPDT (Single Pole/Double
Throw) switches configured as a DPDT. The part was
designed for switching or routing of USB High-Speed
signals and/or USB Full-speed signals in portable
battery powered products.
The 6.5Ω switches were specifically designed to pass
USB high speed/full speed data signals. They have high
bandwidth and low capacitance to pass USB high speed
data signals with minimal DISTORTION.
The ISL54225 has OVP circuitry on the D-/D+ COM pins
that opens the USB in-line switches when the voltage at
these pins exceeds 3.8V (typ) or goes negative by -0.5V
(typ). It isolates fault voltages up to +5.25V or down to
-5V from getting passed to the other-side of the switch,
thereby protecting the USB transceivers.
The digital logic inputs are 1.8V logic compatible when
operated with a 2.7V to 3.6V supply. The ISL54225 has
an output enable pin to open all the switches. It can be
used to facilitate proper bus disconnect and connection
when switching between the USB sources.
The ISL54225 is available in 10 Ld 1.8mmx1.4mm
µTQFN and 10 Ld TDFN packages. It operates over a
temperature range of -40°C to +85°C.
Features
• High-Speed (480Mbps) and Full-Speed (12Mbps)
Signaling Capability per USB 2.0
• 1.8V Logic Compatible (2.7V to +3.6V Supply)
• Enable Pin to Open all Switches
• Low Power Mode
• Power OFF Protection
• D-/D+ Pins Overvoltage Protection for +5.25V and
-5V Fault Voltages
• -3dB Frequency . . . . . . . . . . . . . . . . . . . . 780MHz
• Low ON Capacitance @ 240MHz . . . . . . . . . . 3.3pF
• Low ON-Resistance . . . . . . . . . . . . . . . . . . . . 6.5Ω
• Single Supply Operation (VDD) . . . . . 2.7V to 5.25V
• Available in µTQFN and TDFN Packages
• Pb-Free (RoHS Compliant)
• Compliant with USB 2.0 Short Circuit and
Overvoltage Requirements Without Additional
External Components
Applications*(see page 16)
• MP3 and other Personal Media Players
• Cellular/Mobile Phones
• PDA’s
• Digital Cameras and Camcorders
• USB Switching
Typical Application
3.3V
500Ω
USB 2.0 HS Eye Pattern With
Switches in the Signal Path
VDD
VBUS
LOGIC
CONTROL
OE
SEL
D- D-
OVP
D+ D+
HSD1-
HSD1+
HSD2-
HSD2+
GND ISL54225 GND
µP
USB
TRANSCEIVER
USB
TRANSCEIVER
TIME SCALE (0.2ns/DIV)
July 2, 2010
FN7627.0
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL54225
www.DataSheet4U.com
Electrical Specifications - 2.7V to 5.25V Supply
Test Conditions: VDD = +3.3V, GND = 0V, VSELH = 1.4V,
VSELL = 0.5V, VOEH = 1.4V, VOEL = 0.5V, (Note 10), Unless
Otherwise Specified. Boldface limits apply over the operating
temperature range, -40°C to +85°C. (Continued)
PARAMETER
TEST CONDITIONS
TEMP
MIN
MAX
(°C) (Notes 11, 12) TYP (Notes 11, 12) UNITS
ON Leakage Current,
VDD = 5.25V, SEL = VDD, OE = 0V, VDx = 0.3V, 25
-
2
3
IHSD2x(ON)
3.3V, VHSD2x = 0.3V, 3.3V, VHSD1x = 3.3V, 0.3V Full
-
-
4
µA
µA
Power OFF Leakage
Current, ID+, ID-
VDD = 0V, VD+ = 5.25V, VD-= 5.25V,
SEL = OE = VDD
Power OFF Logic Current, VDD = 0V, SEL = OE = 5.25V
ISEL, IOE
Power OFF D+/D- Current, VDD = 0V, SEL = OE = VDD,
IHSDX+, IHSDX-
VHSDX+ = VHSDX- = 5.25V
OVERVOLTAGE PROTECTION DETECTION
25 - 5 13 µA
25 - 19 26 µA
25 - 0.05 1
µA
Positive Fault-Protection
Trip Threshold, VPFP
VDD = 2.7V to 5.25V, SEL = 0V or VDD, OE = 0V
See Table 1 on page 2
Negative Fault-Protection VDD = 2.7V to 5.25V, SEL = 0V or VDD, OE = 0V
Trip Threshold, VNFP
See Table 1 on page 2
OFF Persistence Time
Fault Protection Response
Time
Negative OVP Response: VDD = 2.7V, SEL = 0V
or VDD, OE = 0V, VDx = 0V to -5V, RL = 15kΩ
Positive OVP Response: VDD = 2.7V, SEL = 0V
or VDD, OE = 0V, VDx = 0V to 5.25V, RL = 15kΩ
ON Persistence Time
Fault Protection Recovery
Time
VDD = 2.7V, SEL = 0V or VDD, OE = 0V, VDx = 0V
to 5.25V or 0V to -5V, RL = 15kΩ
25
25
25
25
25
3.63
-0.76
-
-
-
3.8
-0.5
1
2
40
3.95
-0.29
-
-
-
V
V
µs
µs
µs
DYNAMIC CHARACTERISTICS
Turn-ON Time, tON
VDD = 3.3V, VINPUT = 3V, RL = 50Ω, CL = 50pF 25
(see Figure 1)
- 110 -
ns
Turn-OFF Time, tOFF
Break-Before-Make Time
Delay, tD
Turn-ON Enable Time,
tENABLE
Turn-OFF Disable Time,
tDISABLE
VDD = 3.3V, VINPUT = 3V, RL = 50Ω, CL = 50pF
(see Figure 1)
VDD = 3.3V, RL = 50Ω, CL = 50pF (see Figure 2)
25
25
VDD = 3.3V, VINPUT = 3V, RL = 15kΩ,
CL = 50pF, Time out of All-Off state
VDD = 3.3V, VINPUT = 3V, RL = 15kΩ,
CL = 50pF, Time into All-Off state, Time is
highly dependent on the load (RL , CL) time
constant.
25
25
- 70 -
- 40 -
- 90 -
- 120 -
ns
ns
ns
ns
Skew, (tSKEWOUT - tSKEWIN) VDD = 3.3V, SEL = 0V or 3.3V, OE = 0V, RL = 45Ω,
CL = 10pF, tR = tF = 500ps at 480Mbps, (Duty
Cycle = 50%) (see Figure 6)
25
- 50 -
ps
Rise/Fall Degradation
VDD = 3.3V, SEL = 0V or 3.3V, OE = 0V, RL = 45Ω,
(Propagation Delay), tPD CL = 10pF (see Figure 6)
Crosstalk
VDD = 3.3V, RL = 50Ω, f = 240MHz (see Figure 5)
OFF-Isolation
VDD = 3.3V, OE = 3.3V, RL = 50Ω, f = 240MHz
-3dB Bandwidth
Signal = 0dBm, 0.2VDC offset, RL = 50Ω
OFF Capacitance, CHSxOFF f = 1MHz, VDD = 3.3V, SEL = 0V or 3.3V,
OE = VDD (see Figure 4)
COM ON Capacitance,
CDX(ON)
f = 1MHz, VDD = 3.3V, SEL = 0V or 3.3V,
OE = 0V (see Figure 4)
25
25
25
25
25
25
- 250 -
- -32 -
- -30 -
- 780 -
- 2.5 -
- 5.4 -
ps
dB
dB
MHz
pF
pF
5 FN7627.0
July 2, 2010
5 Page 
ISL54225
www.DataSheet4U.com
LOGIC CONTROL
The state of the ISL54225 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 ISL54225 logic pins are designed to minimize
current consumption when the logic control voltage is
lower than the VDD supply voltage. With VDD = 3.6V and
logic pins at 1.4V, the part typically draws only 25µA.
With VDD = 4.3V and logic pins at 2.6V, the part typically
draws only 35µA. Driving the logic pins to the VDD supply
rail minimizes power consumption.
The SEL pin and OE pin have special circuitry that allows
them to be driven with a voltage higher than the VDD
supply voltage. These pins can be driven up to 5.25V
with a VDD supply in the range of 2.7V to 5.25V.
The SEL pin is internally pulled low through 4MΩ resistor
to ground. The OE pin is internally pulled high through a
4MΩ resistor to VDD. These pins can be tri-stated by a
µProcessor or left floating.
Logic Control Voltage Levels
TABLE 2. LOGIC CONTROL VOLTAGE LEVELS
LOGIC = “0” (LOW)
VDD SUPPLY
RANGE
OE SEL
LOGIC = “1”
(HIGH)
OE SEL
2.7V to 3.6V
≤ 0.5V
≤ 0.5V
or
floating
≥1.4V
or
floating
≥1.4V
3.7V to 4.2V
≤ 0.7V
≤ 0.7V
or
floating
≥1.7V
or
floating
≥1.7V
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.
All Switches OFF Mode
If the SEL pin = Logic “0” 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 10µA (max) of current across the operating
temperature range. In the low power mode, the persistence
checking of the OVP circuitry is de-activated.
If the SEL pin = Logic “1” and the OE pin = Logic “1”, all
of the switches will turn OFF (high impedance). In this
state the complete OTV circuitry is activated.
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 ISL54225 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.
Whenever the ISL54225 senses a fault condition on the
COM pins, all switches will be turned OFF regardless of
the voltage levels at the SEL and OE pins.
USB 2.0 VBUS Short Requirements
The USB specification in section 7.1.1 states a USB
device must be able to withstand a VBUS short (4.4V to
5.25V) or a -1V short to the D+ or D- signal lines when
the device is either powered off or powered on for at
least 24 hours.
4.3V to 5.25V ≤ 0.8V
≤ 0.8V
or
floating
≥2.0V
or
floating
≥2.0V
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 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).
The ISL54225 part has special power-off protection and
OVP detection circuitry to meet these short circuit
requirements. This circuitry allows the ISL54225 to
provide protection to the USB down-stream transceivers
connected at its signal pins (HS1D-, HS1D+, HS2D-,
HS2D+) to meet the USB specification short circuit
requirements.
The power-off protection and OVP circuitry allows the COM
pins (D-, D+) to be driven up to 5.25V or down to -5V while
the VDD supply voltage is in the range of 0V to 5.25V. In
these overvoltage conditions with a 500Ω external VDD
resistor, the part draws < 55µA of current into the COM pins
and causes no stress/damage to the IC. In addition, all
switches are OFF and the shorted VBUS voltage will be
isolated from getting through to the other side of the switch
channels, thereby protecting the USB transceivers.
11 FN7627.0
July 2, 2010
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet ISL54225.PDF ] | |
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