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PDF ISL54224 Data sheet ( Hoja de datos )
| Número de pieza | ISL54224 | |
| Descripción | High-Speed USB 2.0 (480Mbps) Multiplexer | |
| Fabricantes | intersil | |
| Logotipo |  |
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www.DataSheet4U.com
High-Speed USB 2.0 (480Mbps) Multiplexer with
Overvoltage Protection (OVP) and Overvoltage
Indicator Output
ISL54224
The Intersil ISL54224 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 of USB data 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 ISL54224 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 ISL54224 has
an open drain OE/ALM pin that can be driven Low to
open all switches and outputs a Low when the OVP
circuitry is activated. It can be used to facilitate proper
bus disconnect and connection when switching between
the USB sources.
The ISL54224 is available in 10 Ld 1.8mmx1.4mm
µTQFN and 10 Ld TDFN packages. It operates over a
temperature range of -40 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)
• OE/ALM Pin to Open all Switches and Indicate
Overvoltage Fault Condition
• 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
Related Literature*(see page 16)
• See AN1571 “ISL54224IRTZEVAL1Z Evaluation
Board User's Manual”
Typical Application
3.3V
500Ω
3.3V
100kΩ
VDD
VBUS
D- D-
OVP
D+ D+
OE/ALM
LOGIC
CONTROL
SEL
HSD1-
HSD1+
HSD2-
HSD2+
GND ISL54224 GND
µP
USB
TRANSCEIVER
USB
TRANSCEIVER
USB 2.0 HS Eye Pattern With
Switches in the Signal Path
TIME SCALE (0.2ns/DIV)
June 7, 2010
FN6969.0
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  
ISL54224
www.DataSheet4U.com
Electrical Specifications - 2.7V to 5.25V Supply Test Conditions: VDD = +3.3V, GND = 0V, VSELH = 1.4V, VSELL = 0.5V,
VOE/ALMH = 1.4V, VOE/ALML = 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
Power OFF Leakage
Current, ID+, ID-
VDD = 0V, VD+ = 5.25V, VD-= 5.25V,
SEL = OE/ALM = VDD
Power OFF Logic Current, VDD = 0V, SEL = OE/ALM = 5.25V
ISEL, IOE/ALM
Power OFF D+/D-
VDD = 0V, SEL = OE/ALM = VDD,
Current, 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 VDD = 2.7V to 5.25V, SEL = 0V or VDD,
Trip Threshold, VPFP
OE/ALM = VDD, see Table 1 on page 2
Negative
Fault-Protection Trip
Threshold, VNFP
VDD = 2.7V to 5.25V, SEL = 0V or VDD,
OE/ALM = VDD, see Table 1 on page 2
OFF Persistence Time
Fault Protection
Response Time
Negative OVP Response: VDD = 2.7V, SEL = 0V
or VDD, OE/ALM = VDD, VDx = 0V to -5V,
RL = 15kΩ
Positive OVP Response: VDD = 2.7V, SEL = 0V
or VDD, OE/ALM = VDD, VDx = 0V to 5.25V,
RL = 15kΩ
ON Persistence Time
Fault Protection
Recovery Time
VDD = 2.7V, SEL = 0V or VDD, OE/ALM = VDD,
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
-
110
-
(see Figure 1)
ns
Turn-OFF Time, tOFF
VDD = 3.3V, Vinput = 3V, RL = 50Ω, CL = 50pF 25
-
70
-
(see Figure 1)
Break-Before-Make Time VDD = 3.3V, RL = 50Ω, CL = 50pF (see Figure 2) 25
-
40
-
Delay, tD
Turn-ON Enable Time, VDD = 3.3V, VINPUT = 3V, RL = 15kΩ, 25 - 90 -
tENABLE
CL = 50pF, Time out of All-Off state
Turn-OFF Disable Time, VDD = 3.3V, VINPUT = 3V, RL = 15kΩ,
25 - 120 -
tDISABLE
CL = 50pF, Time into All-Off state, Time is
highly dependent on the load (RL, CL) time
constant.
ns
ns
ns
ns
Skew, (tSKEWOUT -
VDD = 3.3V, SEL = 0V or 3.3V, OE/ALM = VDD, 25
-
50
-
ps
tSKEWIN)
RL = 45Ω, CL = 10pF, tR = tF = 500ps at
480Mbps, (Duty Cycle = 50%) (see Figure 6)
Rise/Fall Degradation VDD = 3.3V, SEL = 0V or 3.3V, OE/ALM = VDD, 25 - 250 -
(Propagation Delay), tPD RL = 45Ω, CL = 10pF (see Figure 6)
Crosstalk
VDD = 3.3V, RL = 50Ω, f = 240MHz
(see Figure 5)
25 - -32 -
ps
dB
OFF-Isolation
VDD = 3.3V, RL = 50Ω, f = 240MHz
25 - -30 - dB
-3dB Bandwidth
Signal = 0dBm, 0.2VDC offset, RL = 50Ω
25
-
780
-
MHz
OFF Capacitance,
f = 1MHz, VDD = 3.3V, SEL = 0V or 3.3V,
25
-
2.5
-
pF
CHSxOFF
OE/ALM = 0V (see Figure 4)
COM ON Capacitance, f = 1MHz, VDD = 3.3V, SEL = 0V or 3.3V,
25
-
5.4
-
pF
CDX(ON)
OE/ALM = VDD (see Figure 4)
5 FN6969.0
June 7, 2010
5 Page 
ISL54224
www.DataSheet4U.com
For lowest power consumption you should use the lowest
VDD supply.
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, VDD will be in the range of
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 ISL54224 device is determined by the
voltage at the SEL pin and the OE/ALM pin. SEL is only
active when the OE/ALM pin is logic “1” (High). Refer to
“Truth Table” on page 2.
The ISL54224 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/ALM 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 and OE/ALM pin are internally pulled low
through 4MΩ resistors to ground and can be tri-stated by
a µProcessor.
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/ALM pin = Logic
“1”, 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 Channel 2
is 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” or Logic “1” and the OE/ALM
pin = Logic “0”, 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 ISL54224 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 ISL54224 senses a fault condition on the
COM pins, the OE/ALM pin will be internal pulled low by
the device and all switches will be turned OFF.
The OE/ALM pin is an open drain connection. It should be
pulled high through an external 100kΩ pull-up resistor.
The OE/ALM pin can then be driven “Low” by a
µProcessor to open all switches or it can be monitored by
the µProcessor for a “Low” when the part goes into an
over-voltage condition.
Logic Control Voltage Levels
TABLE 2. LOGIC CONTROL VOLTAGE LEVELS
VDD
SUPPLY
RANGE
LOGIC = “0” (LOW) LOGIC = “1” (HIGH)
OE/ALM
SEL OE/ALM
SEL
2.7V to 3.6V ≤ 0.5V
≤ 0.5V
or floating or floating
3.7V to 4.2V ≤ 0.7V
≤ 0.7V
or floating or floating
4.3V to 5.25V ≤ 0.8V
≤ 0.8V
or floating or floating
≥1.4V
≥1.7V
≥2.0V
≥1.4V
≥1.7V
≥2.0V
HSD1 USB Channel
If the SEL pin = Logic “0” and the OE/ALM pin = Logic
“1”, high-speed Channel 1 will be ON. The HSD1- and
HSD1+ switches are ON and the HSD2- and HSD2+
switches are OFF (high impedance).
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.
The ISL54224 part has special power-off protection and
OVP detection circuitry to meet these short circuit
requirements. This circuitry allows the ISL54224 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 FN6969.0
June 7, 2010
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet ISL54224.PDF ] | |
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