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参数资料
| 型号： | MIC2550AYML25 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/11页 |
| 文件大小： | 0K |
| 描述： | IC USB TRANSCEIVER 14-MLF |
| 标准包装： | 5,000 |
| 类型： | USB 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | USB 2.0 |
| 电源电压： | 4 V ~ 5.25 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-VFQFN 裸露焊盘，14-MLF? |
| 供应商设备封装： | 14-MLF?（2.5x2.5） |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC2550AYML25TR MIC2550AYML25TR-ND |
MIC2550
Micrel, Inc.
M9999-031805
8
March 2005
Applications Information
The MIC2550 is designed to provide USB connectivity in
mobile systems where system supply voltages are not avail-
able to satisfy USB requirements. The MIC2550 can operate
down to supply voltages of 2.5V and still meet USB physical
layer specifications. As shown in the system diagram, the
MIC2550 takes advantage of USB’s supply voltage, V
BUS, to
operate the transceiver. The system voltage, V
IF, is used to
set the reference voltage used by the digital I/O lines (VP, VM,
RCV, OE#, SPD, and SUS pins) interfacing to the system.
Internal circuitry provides translation between the USB and
system voltage domains. V
IF will typically be the main supply
voltage rail for the system.
In addition, a 3.3V, 10% termination supply voltage, V
TRM, is
provided to support speed selection. A 0.47F (minimum)
capacitor from V
TRM to ground is required to ensure stability.
As shown in the typical application diagram, a 1F capacitor
is recommended. A 1.5K resistor is required between this pin
and the D+ or D– lines to respectively specify full-speed or
low-speed operation.
Power Supply Configurations
V
IF/VBUS Switched
When the V
BUS input pin is pulled to ground a low impedance
path between V
IF and VBUS can cause a high current flow
from V
IF to VBUS thereby damaging the MIC2550. This issue
can arise in systems where V
BUS is driven from a power
supply that can be switched off such as in the case of a
desktop PC. Adding a Schottky diode, such as the ZHCS1000
by Zetex, in series with V
BUS will prevent any current flow
during this condition. A solution is shown in Figure 8 below.
MIC2550
VIF
Note: *(Optional) See Text - Power Supply Configurations
VBUS
1F min
VBUS
USB Device
Power Controller
*(Optional)
D1
ZHCS1000 or
equivalent
Figure 8. Solution to V
IF/VBUS Switching
I/O Interface Using 3.3V
In systems where the I/O interface utilizes a 3.3V USB
controller, an alternate solution is shown in Figure 9. This
configuration has the advantage over Figure 8, in that no
extra components are needed. Ensure that the load on V
TRM
does not exceed 1mA total.
MIC2550
VIF
VBUS
I/O
VBUS
VP/VM/
RCV/OE#
VTRM
USB
Controller
VDD
3.3V
Figure 9. I/O Interface Uses 3.3V
Internal 3.3V Source
If the device is self-powered and has 3.3V available, the
circuit in Figure 10 is yet another power supply configuration
option. In this configuration, the internal regulator is disabled
and the 3.3V source and not V
BUS powers the entire chip.
MIC2550
VIF
3.3V
VBUS
VTRM
Figure 10. Powering Chip
from Internal 3.3V Source
Suspend
When the suspend pin (SUS) is high, power consumption is
reduced to a minimum. V
TRM is not disabled. RCV, VP and VM
are still functional to enable the device to detect USB activity.
For minimal current consumption in suspend mode, it is
recommended that OE# = 1.
External ESD Protection
The use of ESD transient protection devices is not required
for operation, but is recommended. We recommend the
following devices or the equivalent:
Cooper Electronics Technologies (www.cooperet.com)
41206ESDA SurgX
0805ESDA SurgX
Littelfuse (www.littelfuse.com)
V0402MHS05
SP0503BAHT
Non-Multiplexed Bus
To save pin count for the USB logic controller interface, the
MIC2550 was designed with V
P and VM as bidirectional pins.
To interface the MIC2550 with a non-multiplexed data bus,
resistors can be used for low cost isolation as shown in
Figure 11.
VPO
VP
VM
VMO
USB Logic
Controller
(SIE)
MIC2550
VP
VM
10k
Figure 11. MIC2550 Interface to
Non-Multiplexed Data Bus
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2550AYMLTR | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| MIC2550AYML-TR | 功能描述:1/1 Transceiver Half USB 2.0 16-MLF? (4x4) 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:有效 类型:收发器 协议:USB 2.0 驱动器/接收器数:1/1 双工:半 接收器滞后:200mV 数据速率:12Mbps 电压 - 电源:4 V ~ 5.25 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-VFQFN 裸露焊盘，16-MLF? 供应商器件封装:16-MLF?（4x4） 标准包装:1 |
| MIC2550AYTS | 功能描述:USB 接口集成电路 USB Transceiver (Lead Free) RoHS:否 制造商:Cypress Semiconductor 产品:USB 2.0 数据速率: 接口类型:SPI 工作电源电压:3.15 V to 3.45 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:WLCSP-20 |
| MIC2550AYTS TR | 功能描述:USB 接口集成电路 USB Transceiver (Lead Free) RoHS:否 制造商:Cypress Semiconductor 产品:USB 2.0 数据速率: 接口类型:SPI 工作电源电压:3.15 V to 3.45 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:WLCSP-20 |
| MIC2550BML | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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