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ISL54227IRTZ датащи(PDF) 9 Page - Intersil Corporation

номер детали ISL54227IRTZ
подробное описание детали  High-Speed USB 2.0 (480Mbps) DPST Switch with Overvoltage Protection (OVP) and Dedicated Charger Port Detection
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производитель  INTERSIL [Intersil Corporation]
домашняя страница  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL54227IRTZ датащи(HTML) 9 Page - Intersil Corporation

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ISL54227
9
FN7593.0
July 2, 2010
Detailed Description
The ISL54227 device is a dual single pole/single throw
(SPST) analog switch configured as a DPST that operates
from a single DC power supply in the range of 2.7V to
5.25V.
It was designed for switching a USB high-speed or
full-speed source in portable battery powered products.
It is offered in small µTQFN and TDFN packages for use
in MP3 players, cameras, PDAs, cellphones, and other
personal media players.
The part consists of two 3.5Ω high-speed SPST switches.
These switches have high bandwidth and low capacitance
to pass USB high-speed (480Mbps) differential data
signals with minimal edge and phase distortion. They can
also swing from 0V to 3.6V to pass USB full speed
(12Mbps) differential data signals with minimal
distortion.
The device has a single logic control pin (OE) to open and
close the two SPST switches. The part has an LP control
pin to put the part in a low power state.
The part contains special over voltage protection (OVP)
circuitry on the COM+ and COM- pins. This circuitry acts
to open the SPST switches when the part senses a
voltage on the COM pins that is >3.8V (typ) or < -0.45V
(typ). It isolates voltages up to 5.25V and down to -5V
from getting through to the other side of the switches
(D-, D+) to protect the USB down-stream transceiver
connected at the D+ and D- pins. It has an alarm (ALM)
interrupt output to indicate when the device has detected
and entered the OTV state. This output can be monitored
by a µController to indicate a fault condition to the
system.
The part has charger port interrupt detection circuitry
(CP) on the COM pins that outputs a Low on the INT pin
to inform the µController or power management circuitry
when entering a dedicated charging port mode of
operation. The charger mode operation is initiated by
driving the OE pin Low and externally connecting the
COM pins together which pulls the COM lines High,
triggering the INT pin to go Low and the SPST switches
to open.
The ISL54227 was designed for MP3 players, cameras,
cellphones, and other personal media player applications
that need to switch a high-speed or full-speed
transceiver source. See this functionality in the
“Application Block Diagram” on page 8.
A detailed description of the SPST switches is provided in
the following section.
High-Speed (Dx) SPST Switches
The Dx switches are bi-directional switches that can pass
USB high-speed and USB full-speed signals when VDD is
in the range of 2.7V to 5.25V.
When powered with a 2.7V supply, these switches have a
nominal rON of 3.5Ω over the signal range of 0V to
400mV with a rON flatness of 0.26Ω. The rON matching
between the switches over this signal range is only 0.2Ω,
ensuring minimal impact by the switches to USB high
speed signal transitions. As the signal level increases, the
rON switch resistance increases. At signal level of 3.3V,
the switch resistance is nominally 6.8Ω. See Figures 9,
10, 11, 12, 13, 14 in the “Typical Performance Curves”
beginning on page 11.
The Dx switches were specifically designed to pass USB
2.0 high-speed (480Mbps) differential signals in the
range of 0V to 400mV. They have low capacitance and
high bandwidth to pass the USB high-speed signals with
minimum edge and phase distortion to meet USB 2.0
high speed signal quality specifications. See Figure 15 in
the “Typical Performance Curves” on page 13 for USB
High-speed Eye Pattern taken with switch in the signal
path.
The Dx switches can also pass USB full-speed signals
(12Mbps) in the range of 0V to 3.6V with minimal
distortion and meet all the USB requirements for USB
2.0 full-speed signaling. See Figure 16 in the “Typical
Performance Curves” on page 14 for USB Full-speed
Eye Pattern taken with switch in the signal path.
The switches are active (turned ON) whenever the OE
voltage is logic “1”(High) and the LP voltage is logic “0”
(Low) and OFF when the OE voltage is logic “0” (Low)
and the LP voltage is logic “0” (Low) or logic “1” (High).
OVERVOLTAGE PROTECTION (OVP)
The maximum normal operating signal range for the Dx
switches is from 0V to 3.6V. For normal operation the
signal voltage should not be allow to exceed these
voltage levels or go below ground by more than -0.3V.
However, in the event that a positive voltage >3.8V (typ)
to 5.25V, such as the USB 5V VBUS voltage, gets shorted
to one or both of the COM+ and COM- pins or a negative
voltage <-0.45V (typ) to -5V gets shorted to one or both
of the COM pins, the ISL54227 has OVP circuitry to
detect the over voltage condition and open the SPST
switches to prevent damage to the USB down-stream
transceiver connected at the signal pins (D-, D+).
The OVP and power-off protection circuitry allows the
COM pins (COM-, COM+) to be driven up to 5.25V while
the VDD supply voltage is in the range of 0V to 5.25V. In
this condition, the part draws <100µA of ICOMx and IDD
current and causes no stress to the IC. In addition the
SPST switches are OFF and the fault voltage is isolated
from the other side of the switch.
The part has an alarm (ALM) interrupt output to indicate
when the device has detected and entered the OTV state.
This output can be monitored by a µController to indicate
a fault condition to the system.
External VDD Series Resistor to Limit IDD Current
during Negative OVP Condition
A 100Ω to 1kΩ resistor in series with the VDD pin (see
Figure 6) is required to limit the IDD current draw from
the system power supply rail during a negative OVP fault
event.


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