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参数资料
| 型号： | ISL54208IRZ-T |
| 厂商： | INTERSIL CORP |
| 元件分类： | 运动控制电子 |
| 英文描述： | Low Voltage, Dual SPDT, USB/CVBS/ Audio Switches, with Negative Signal Capability |
| 中文描述： | DUAL 1-CHANNEL, SGL POLE DOUBLE THROW SWITCH, PDSO10 |
| 封装： | 3 X 3 MM, ROHS COMPLIANT, PLASTIC, MO-229WEED-3, TDFN-10 |
| 文件页数： | 10/15页 |
| 文件大小： | 442K |
| 代理商： | ISL54208IRZ-T |
10
FN6410.0
December 18, 2006
ISL54208 Operation
The discussion that follows will discuss using the ISL54208 in
the typical application shown in the block diagrams on
page 8.
VDD SUPPLY
The dc power supply connected at VDD (pin 1) provides the
required bias voltage for proper switch operation. The part
can operate with a supply voltage in the range of 1.8V to
5.5V.
In a typical USB/Audio/Video application for portable battery
powered devices the V
DD
voltage will come from a battery or
an LDO and be in the range of 2.7V to 3.6V. For best
possible USB full-speed operation (12Mbps) it is
recommended that the VDD voltage be
≥
3.3V in order to get
a USB data signal level above 2.5V.
LOGIC CONTROL
The state of the ISL54208 device is determined by the
voltage at the IN pin (pin 2) and the CTRL pin (pin 10). Refer
to truth-table on page 2 of data sheet. These logic pins are
1.8V compatible with V
DD
in the range of 2.7V to 3.6V and
can be controlled by a standard
μ
processor.
The CTRL pin is internally pulled low through a 4M
Ω
resistors to ground and can be left floating or tri-stated by the
μ
processor. The CTRL control pin is only active when IN is
logic “0”.
The IN pin does not have an internal pull-down resistor and
must not be allowed to float. It must be driven High or Low.
The voltage at the IN pin can exceed the V
DD
voltage by as
much as 2.55V. This allows the VBUS voltage from a
computer or USB hub (4.4V to 5.25V) to drive the IN pin
while the V
DD
voltage is in the range of 2.7V to 3.6V. An
external pull-down resistor is required from the IN pin to
ground when directly driving the IN pin with the computer
VBUS voltage. See the section titled “USING THE
COMPUTER VBUS VOLTAGE TO DRIVE THE “IN’ PIN”.
Logic control voltage levels:
IN = Logic “0” (Low) when
≤
0.5V
IN = Logic “1” (High) when IN
≥
1.4V
CTRL = Logic “0” (Low) when
≤
0.5V or floating.
CTRL = Logic “1” (High) when
≥
1.4V
Audio/Video Mode
If the IN pin = Logic “0” and CTRL pin = Logic “1,” the part
will be in the Audio/Video mode. In Audio/Video mode the
NC1 and NC2 3
Ω
audio/video switches are ON and the NO1
and NO2 5
Ω
USB switches are OFF (high impedance).
When nothing is plugged into the common connector or a
audio/video jack is plugged into the common connector, the
μ
processor will sense that there is no voltage at the VBUS
pin of the connector and will drive and hold the IN control pin
of the ISL54208 low. As long as the CTRL = Logic “1,” the
ISL54208 part will be in the audio/video mode and the media
player audio and video drivers can drive the speaker and
video display.
USB Mode
If the IN pin = Logic “1” and CTRL pin = Logic “0” or Logic “1”
the part will go into USB mode. In USB mode, the NO1 and
NO2 5
Ω
switches are ON and the NC1 and NC2 3
Ω
audio/video switches are OFF (high impedance).
When a USB cable from a computer or USB hub is
connected at the common connector, the
μ
processor will
sense the present of the 5V VBUS and drive the IN pin
voltage high. The ISL54208 part will go into the USB mode.
In USB mode, the computer or USB hub transceiver and the
media player USB transceiver are connected and digital data
will be able to be transmitted back and forth.
When the USB cable is disconnected, the
μ
processor will
sense that the 5V VBUS voltage is no longer connected and
will drive the IN pin low and put the part back into the
Audio/Video or Low Power Mode.
Low Power Mode
If the IN pin = Logic “0” and CTRL pin = Logic “0,” the part
will be in the Low Power mode. In the Low Power mode, the
NCx switches and the NOx switches are OFF (high
impedance). In this state, the device draws typically 1nA of
current.
USING THE COMPUTER VBUS VOLTAGE TO DRIVE THE
“IN” PIN
External IN Pull-Down Resistor
Rather than using a micro-processor to control the IN logic
pin you can directly drive the IN pin using the VBUS voltage
from the computer or USB hub. In order to do this you must
connected an external pull-down resistor from the IN pin to
ground.
When an audio/video jack or nothing is connected at the
common connector the external pull-down resistor will pull
the IN pin low putting the ISL54208 in the Audio/Video Mode
or Low Power Mode depending on the condition of the CTRL
pin.
When a USB cable is connected at the common connector
the voltage at the IN pin will be driven to 5V and the part will
automatically go into the USB mode.
When the USB cable is disconnected from the common
connector the voltage at the IN pin will be pulled low by the
pull-down resistor and return to the Audio/Video Mode or
Low Power Mode depending on the condition of the CTRL
pin.
Note: The voltage at the IN pin can exceed the VDD voltage
by as much as 2.55V. This allows the VBUS voltage from a
computer or USB hub (4.4V to 5.25V) to drive the IN pin
while the V
DD
voltage is in the range of 2.7V to 3.6V.
ISL54208
相关PDF资料 |
PDF描述 |
|---|---|
| ISL54208IRZ | Low Voltage, Dual SPDT, USB/CVBS/ Audio Switches, with Negative Signal Capability |
| ISL54208IRUZ-T | Low Voltage, Dual SPDT, USB/CVBS/ Audio Switches, with Negative Signal Capability |
| ISL54209 | MP3/USB 2.0 High Speed Switch with Negative Signal Handling and Low Power Shutdown |
| ISL54209IRTZ | MP3/USB 2.0 High Speed Switch with Negative Signal Handling and Low Power Shutdown |
| ISL54209IRTZ-T | MP3/USB 2.0 High Speed Switch with Negative Signal Handling and Low Power Shutdown |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL54209 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:MP3/USB 2.0 High Speed Switch with Negative Signal Handling and Low Power Shutdown |
| ISL54209EVAL1Z | 功能描述:EVALUATION BOARD FOR ISL54209 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PCI Express® (PCIe) 主要目的:接口，收发器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要属性:- 次要属性:- 已供物品:板 |
| ISL54209IRTZ | 功能描述:IC USB SWITCH DUAL SPDT 10TDFN RoHS:是 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:36 系列:- 功能:多路复用器 电路:2 x 4:1 导通状态电阻:75 欧姆 电压电源:单/双电源 电压 - 电源，单路/双路(±):2 V ~ 12 V，±2 V ~ 6 V 电流 - 电源:- 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 供应商设备封装:20-SOIC W 包装:管件 |
| ISL54209IRTZ-T | 功能描述:IC USB SWITCH DUAL SPDT 10TDFN RoHS:是 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:36 系列:- 功能:多路复用器 电路:2 x 4:1 导通状态电阻:75 欧姆 电压电源:单/双电源 电压 - 电源，单路/双路(±):2 V ~ 12 V，±2 V ~ 6 V 电流 - 电源:- 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 供应商设备封装:20-SOIC W 包装:管件 |
| ISL54209IRU1Z-T | 功能描述:IC MP3/USB SWITCH SPDT DL 10TQFN RoHS:是 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:36 系列:- 功能:多路复用器 电路:2 x 4:1 导通状态电阻:75 欧姆 电压电源:单/双电源 电压 - 电源，单路/双路(±):2 V ~ 12 V，±2 V ~ 6 V 电流 - 电源:- 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 供应商设备封装:20-SOIC W 包装:管件 |
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