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参数资料
| 型号： | ISL54417 |
| 厂商： | Intersil Corporation |
| 英文描述： | Low Voltage, Dual SPDT, USB/CVBS/Audio Switches with Negative Signal Capability(具有负信号能力的低电压, 双路单刀双掷, USB/CVBS/音频开关) |
| 中文描述： | 低电压，双路SPDT，的USB / CVBS输入/音频开关具有负信号功能（具有负信号能力的低电压，双路单刀双掷，的USB / CVBS输入/音频开关） |
| 文件页数： | 11/14页 |
| 文件大小： | 490K |
| 代理商： | ISL54417 |
11
FN6318.1
June 27, 2006
ISL54415 and ISL54416 Operation
The ISL54415 and ISL54416 function the same except the
ISL54416 does not have the V
TERM
feature. The discussion
that follows pertains to both devices and will discuss using the
parts in the typical application shown in the block diagram on
page 10.
LOGIC CONTROL
The state of the ISL54415 and ISL54416 devices are
determined by the voltage at the V
BUS
pin (pin 2). The V
BUS
pin is internally pulled low and can be left floating.
If V
BUS
(pin 2) is floating or the V
BUS
voltage
≤
V
DD
+ 0.2V
the part will be in the audio/video mode. In Audio/Video
mode the NC1 and NC2 1
Ω
audio/video switches are ON
and the NO1 and NO2 5
Ω
USB switches are OFF (high
impedance). In this state power to the part is provided by the
DC voltage connected at the V
DD
pin (pin 1). In a typical
application V
DD
will be in the range of 2.5V to 3.6V and will
be connected to the battery or LDO of the media player.
When a headphone/video receiver is plugged into the
common connector, nothing gets connected at the V
BUS
pin
(its floating) and the ISL54415 and ISL54416 parts remains
in the audio/video mode and the media player audio and
video drivers can drive the headphones and video display.
If V
BUS
(pin 2) voltage is greater than V
DD
by 0.8V the part
will go into USB mode. In USB mode the NO1 and NO2 5
Ω
USB switches are ON and the NC1 and NC2 1
Ω
audio/video
switches are OFF (high impedance). In this state the part will
be powered by the voltage connected at the V
BUS
pin (pin
2). When a USB cable from a computer or USB hub is
connected at the common connector the V
BUS
voltage is
driven to between 4.4V and 5.25V. The ISL54415 and
ISL54416 parts 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
transmit back and forth.
When the USB cable is disconnected the switch
automatically turns the NO1 and NO2 switches OFF and
turns the NC1 and NC2 audio/video switches ON.
POWER
In audio/video mode the power supply connected at V
DD
(pin 1) provides power to the ISL54415 and ISL54416 parts.
Its voltage should be kept in the range of 2.5V to 3.6V when
used in a USB application to ensure you get proper
switching when the V
BUS
voltage is at its lower limit of 4.4V.
In USB mode power for the ISL54415 and ISL54416 parts is
provided from the V
BUS
line from the host USB controller of
the computer or USB hub. Its voltage will be between 4.4V
and 5.25V.
V
TERM
OPERATION (ISL54415 ONLY)
When a USB cable from a computer is connected to a USB
device a V
TERM
voltage must be applied to a speed
indicating pull-up resistor to properly terminate the bus and
identify whether the USB device is a full-speed or low-speed
device to facilitate proper digital transmission. When the
cable is removed from the device this V
TERM
voltage must
be disconnected from the speed indicating pullup resistor.
The ISL54415 device can perform this operation.
When V
DD
≥
2.5V and V
BUS
≥
V
DD
+ 0.8V, the V
TERM
pin
(pin 10) outputs an open circuit voltage equal to the voltage
at the V
BUS
pin. Otherwise the V
TERM
pin will be in a HI-Z
state.
The ISL54415 V
TERM
circuitry has an internal series resistor
approximately equal to 5.3k
Ω
. For a full-speed USB
application it is recommended you use a 3k
Ω
±5% speed
indicating pull-up resistor. When the USB bus is in the idle
state, a 3k
Ω
±5% resistor will put the D+ line voltage in the
range of 2.7V to 3.6V as required by the USB specification.
For low-speed USB application it is recommend you use a
2k
Ω
±5% pull-up resistor at the D- line in order to meet the
USB connect and disconnect timing requirements.
ISL54417 Operation
The ISL54417 is an audio/video and data switch. Its logic
control is typical of a standard dual SPDT switch.
The digital control for the ISL54417 are the IN pins (pin 2
and pin 10). These pins are 1.8V logic compatible when
operated with a 3.0V supply. The device has been designed
to have low I
DD
current even when the logic voltage is not at
the rail. With V
DD
= 5.5V and V
IN
= 2.85V the ISL54417
draws only 8μA current.
When logic pin IN1 (pin 10) is LOW the NC1 audio/video
switch is ON and the NO1 USB data switch is OFF. When
logic pin IN1 (pin 10) is HIGH the NC1 audio/video switch is
OFF and the NO1 USB data switch is ON.
When logic pin IN2 (pin 2) is LOW the NC2 audio/video
switch is ON and the NO2 USB data switch is OFF. When
logic pin IN2 (pin 2) is HIGH the NC2 audio/video switch is
OFF and the NO2 USB data switch is ON.
Power for the ISL54417 device is always provided by the DC
voltage source connected at the V
DD
pin (pin 1). The V
DD
power supply voltage range is from 1.8V to 5.5V.
ISL54415, ISL54416, ISL54417
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| ISL54417IRUZ-T | 功能描述:IC USB SWITCH DUAL SPDT 10UTQFN 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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| ISL54500IHZ-T | 功能描述:IC SWITCH SPDT SGL SOT23-6 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:- 标准包装:2,500 系列:- 功能:视频交叉点开关 电路:1 x 8:6 导通状态电阻:- 电压电源:单电源 电压 - 电源，单路/双路(±):3.135 V ~ 5.25 V 电流 - 电源:55mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:24-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:24-TSSOP 包装:带卷 (TR) 产品目录页面:1214 (CN2011-ZH PDF) 其它名称:FMS6502MTC24XTR |
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