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参数资料
| 型号： | FSUSB20BQX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC USB SWITCH DUAL 2X1 14DQFN |
| 标准包装： | 3,000 |
| 功能： | USB 开关 |
| 电路： | 2 x 2:1 |
| 导通状态电阻： | 6.5 欧姆 |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFQFN 裸露焊盘 |
| 供应商设备封装： | 14-DQFN |
| 包装： | 带卷 (TR) |
Micrel, Inc.
SY54023R
March 2008
7
M9999-033108-A
hbwhelp@micrel.com or (408) 955-1690
Functional Description
Fail-Safe Input (FSI)
The input includes a special failsafe circuit to sense
the amplitude of the input signal and to latch the
output when there is no input signal present, or when
the amplitude of the input signal drops sufficiently
below 100mVPK (200mVPP), typically 30mVPK.
Maximum frequency of the SY54023R is limited by
the FSI function.
Input Clock Failure Case
If the input clock fails to a floating, static, or extremely
low signal swing, the FSI function will eliminate a
metastable condition and guarantee a stable output.
No ringing and no undetermined state will occur at the
output under these conditions.
Note that the FSI function will not prevent duty cycle
distortion in case of a slowly deteriorating (but still
toggling) input signal close to the FSI threshold. Due
to the FSI function, the propagation delay will depend
on rise and fall time of the input signal and on its
amplitude. Refer to “Typical Characteristics” for
detailed information
Interface Applications
For Input Interface Applications, see Figures 4a
through 4f and for CML Output Termination, see
Figures 5a through 5d.
CML Output Termination with VCCO 1.2V
For VCCO of 1.2V, Figure 5a, terminate the output
with 50-to-1.2V, DC-coupled, not 100 differentially
across the outputs.
If AC-coupling is used, Figure 5d, terminate into 50-
to-1.2V before the coupling capacitor and then
connect to a high value resistor to a reference
voltage.
Do not AC couple with internally terminated receiver.
For example, 50 ANY-IN input. AC-coupling will
offset the output voltage by 200mV and this offset
voltage will be too low for proper driver operation.
Any unused output pair needs to be terminated when
VCCO is 1.2V, do not leave floating.
CML Output Termination with VCCO 1.8V
For VCCO of 1.8V, Figure 5a and Figure b, terminate
with either 50-to-1.8V or 100 differentially across
the outputs. AC- or DC-coupling is fine.
Input AC Coupling
The SY54023R input can accept AC-coupling from
any driver. Bypass VT with a 0.1F low ESR capacitor
to VCC as shown in Figures 4c and 4d. VT has an
internal high impedance resistor divider as shown in
Figure 2a, to provide a bias voltage for AC-coupling.
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| FSUSB20L10X | 功能描述:模拟开关 IC 1 Port Hi-Speed USB RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
| FSUSB20MUX | 功能描述:多路器开关 IC L- Pwr1 Port Hi-Spd USB 480Mbps Switch RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| FSUSB20MUX | 制造商:Fairchild Semiconductor Corporation 功能描述:USB Switch 制造商:Fairchild Semiconductor Corporation 功能描述:IC, USB SWITCH, 480MBPS, 720MHZ, MSOP-10 |
| FSUSB20MUX-CUT TAPE | 制造商:FAIRCHILD 功能描述:FSUSB20 Series 3.6 V 480 Mbps Low-Power 1-Port High-Speed USB Switch - MSOP-10 |
| FSUSB20Z WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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