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參數(shù)資料
| 型號： | ISL54220IRUEVAL1Z |
| 廠商： | Intersil |
| 文件頁數(shù)： | 2/18頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVALUATION BOARD FOR ISL54220 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 接口，2:1 多路復(fù)用器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ISL54220 |
| 主要屬性： | 2 x SPDT 模擬開關(guān) |
| 次要屬性： | 2.7 V ~ 5.5 V 電源 |
| 已供物品： | 板 |
10
FN6819.1
February 4, 2010
and the fault voltage is isolated from the other side of the
switch. When VDD is in the range of 2.7V to 5.5V the
fault voltage will pass through to the output of an active
switch channel.
The HS1 channel switches are active (turned ON)
whenever the SEL voltage is logic “0” (Low) and the OE
voltage is logic “0” (Low).
The HS2 channel switches are active (turned ON)
whenever the SEL voltage is logic “1” (High) and the OE
voltage is logic “0” (Low).
ISL54220 Operation
The following will discuss using the ISL54220 shown in
POWER
The power supply connected at the VDD pin provides the
DC bias voltage required by the ISL54220 part for proper
operation. The ISL54220 can be operated with a VDD
voltage in the range of 2.7V to 5.5V. When used in a USB
application, the VDD voltage should be kept in the range
of 3.0V to 5.5V to ensure you get the proper signal levels
for good signal quality.
A 0.01F or 0.1F 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 ISL54220 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”
The ISL54220 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 6.6A.
With VDD = 4.3V and logic pins at 2.6V, the part typically
draws only 0.2A. Driving the logic pins to the VDD
supply rail minimizes power consumption.
The logic pins must be held High or Low and must not
float.
Logic Control Voltage Levels
With VDD supply voltage in the range of 2.7V to 3.6V the
logic levels are:
OE = Logic “0” (Low) when VOE ≤ 0.5V
OE = Logic “1” (High) when VOE ≥ 1.4V
SEL = Logic “0” (Low) when VSEL ≤ 0.5V
SEL = Logic “1” (High) when VSEL ≥ 1.4V
With VDD supply voltage in the range of 4.3V to 5.5V the
logic levels are:
OE = Logic “0” (Low) when VOE ≤ 0.8V
OE = Logic “1” (High) when VOE ≥ 2.0V
SEL = Logic “0” (Low) when VSEL ≤ 0.8V
SEL = Logic “1” (High) when VSEL ≥ 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 one is active, a link
will be established between the USB 1 driver section of
the media player and the computer. The device will be
able to transmit and receive data from the computer at a
data rate of 480Mbps.
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).
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 at a data rate of 480Mbps.
All Switches OFF Mode
If the SEL pin = Logic “0” or Logic “1” and the OE pin =
Logic “1”, 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 ISL54220 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.
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 to the D+
or D- signal lines when the device is either powered off or
powered on for at least 24 hours. The ISL54220 part has
special fault protection circuitry to meet these short
circuit requirements.
The fault protection circuitry allows the signal pins
(D-, D+, HS1D-, HS1D+, HS2D-, HS2D+) to be driven
up to 5.5V while the VDD supply voltage is in the range of
0V to 5.5V. In this overvoltage condition the part draws
<500A of current and causes no stress/damage to the
IC.
ISL54220
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| ISL54220IUZ-T | 功能描述:IC USB SWITCH DUAL SPDT 10MSOP 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) |
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