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參數(shù)資料
| 型號(hào)： | ISL54227IRTZ |
| 廠商： | Intersil |
| 文件頁(yè)數(shù)： | 18/18頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC USB SWITCH DUAL DPST 10TDFN |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 功能： | 開關(guān) |
| 電路： | 2 x SPST |
| 導(dǎo)通狀態(tài)電阻： | 17 歐姆 |
| 電壓電源： | 單電源 |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 5.25 V |
| 電流 - 電源： | 45µA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-VFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 10-TDFN-EP（3x3） |
| 包裝： | 管件 |
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ISL54227
9
FN7593.1
September 5, 2013
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
TQFN and TDFN packages for use in MP3 players, cameras,
PDAs, cellphones, and other personal media players.
The part consists of two 3.5
Ω 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
OVP state. This output can be monitored by a Controller 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
Controller 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 0.2
Ω, 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 6.8
Ω. See
Figures 11, 12, 13, 14, 15, 16 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 17 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 18
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 <100A 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 OVP state. This output
can be monitored by a Controller to indicate a fault condition to
the system.
External VDD Series Resistor to Limit IDD Current during
Negative OVP Condition
A 100 to 1k resistor in series with the VDD pin (see Figure 8) is
required to limit the IDD current draw from the system power
supply rail during a negative OVP fault event.
With a negative -5V fault voltage at both com pins, the graph in
Figure 9 shows the IDD current draw for different external
resistor values for supply voltages of 2.7V, 3.6V, and 5.25V. Note:
With a 500 resistor the current draw is limited to around 5mA.
When the negative fault voltage is removed the IDD current will
return to it’s normal operation current of 25A to 45A.
The series resistor also provides improved ESD and latch-up
immunity. During an overvoltage transient event (such as occurs
during system level IEC 61000 ESD testing), substrate currents
can be generated in the IC that can trigger parasitic SCR
structures to turn ON, creating a low impedance path from the
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL54227IRTZEVAL1Z | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:High-Speed USB 2.0 (480Mbps) DPST Switch with Overvoltage Protection (OVP) and Dedicated Charger Port Detection |
| ISL54227IRTZ-T | 功能描述:IC USB SWITCH DUAL DPST 10TDFN RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關(guān)，多路復(fù)用器，多路分解器 系列:- 其它有關(guān)文件:STG4159 View All Specifications 標(biāo)準(zhǔn)包裝:5,000 系列:- 功能:開關(guān) 電路:1 x SPDT 導(dǎo)通狀態(tài)電阻:300 毫歐 電壓電源:雙電源 電壓 - 電源，單路/雙路(±):±1.65 V ~ 4.8 V 電流 - 電源:50nA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:7-WFBGA，F(xiàn)CBGA 供應(yīng)商設(shè)備封裝:7-覆晶 包裝:帶卷 (TR) |
| ISL54227IRUZ-T | 功能描述:IC USB SWITCH DUAL DPST 10TQFN RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關(guān)，多路復(fù)用器，多路分解器 系列:- 其它有關(guān)文件:STG4159 View All Specifications 標(biāo)準(zhǔn)包裝:5,000 系列:- 功能:開關(guān) 電路:1 x SPDT 導(dǎo)通狀態(tài)電阻:300 毫歐 電壓電源:雙電源 電壓 - 電源，單路/雙路(±):±1.65 V ~ 4.8 V 電流 - 電源:50nA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:7-WFBGA，F(xiàn)CBGA 供應(yīng)商設(shè)備封裝:7-覆晶 包裝:帶卷 (TR) |
| ISL54227IRUZ-T7A | 功能描述:IC USB SWITCH DUAL DPST 10TQFN RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關(guān)，多路復(fù)用器，多路分解器 系列:- 應(yīng)用說(shuō)明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:250 系列:- 功能:開關(guān) 電路:單刀單擲 導(dǎo)通狀態(tài)電阻:48 歐姆 電壓電源:單電源 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V 電流 - 電源:5µA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:48-LQFP 供應(yīng)商設(shè)備封裝:48-LQFP（7x7） 包裝:托盤 |
| ISL54228 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:High-Speed USB 2.0 (480Mbps) DPST Switch with Overvoltage Protection (OVP) |
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