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参数资料
| 型号： | MAX3349EETE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC TXRX USB 2.0 FS 16-TQFN |
| 标准包装： | 75 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | USB 2.0 |
| 电源电压： | 4 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（4x4） |
| 包装： | 管件 |
MAX3349E
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
12
______________________________________________________________________________________
remains enabled in suspend mode to allow transmis-
sion of a remote wake-up on D+ and D-.
D+ and D-
D+ and D- are either USB signals or UART signals,
depending on the operating mode. In USB mode,
D+/D- serve as receiver inputs when OE is logic-high
and transmitter outputs when OE is logic-low. Internal
series resistors are provided on D+ and D- to allow a
direct interface with a USB connector. In UART mode,
D+ is an input and D- is an output. UART signals on Tx
are presented on D-, and signals on D+ are presented
on Rx. The UART signaling levels for D+/D- are deter-
mined by VUART. Logic thresholds for Rx and Tx are
determined by VL. D+ and D- are ESD protected to
±15kV HBM.
RCV
RCV is the output of the differential USB receiver. RCV
is a logic 1 for D+ high and D- low. RCV is a logic 0 for
D+ low and D- high. RCV retains the last valid logic
state when D+ and D- are both low (SE0). RCV is driven
logic-low when SUS is high. See Tables 3a and 3b.
BD
The bus-detect (BD) output is asserted logic-high when
a voltage greater than VTH-BUS is presented on VBUS.
This is typically the case when the MAX3349E is con-
nected to a powered USB. BD is logic-low when VBUS
is unconnected.
ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. Additional ESD-protection structures guard
D+ and D- against damage from ESD events up to
±15kV. The ESD structures arrest ESD events in all
operating modes: normal operation, suspend mode,
and when the device is unpowered.
Several ESD testing standards exist for gauging the
robustness of ESD structures. The ESD protection of the
MAX3349E is characterized to the following standards:
±15kV Human Body Model (HBM)
±8kV Air-Gap Discharge per IEC 61000-4-2
±8kV Contact Discharge per IEC 61000-4-2
Human Body Model
Figure 9 shows the model used to simulate an ESD
event resulting from contact with the human body. The
model consists of a 100pF storage capacitor that is
charged to a high voltage, then discharged through a
1.5k resistor. Figure 10 shows the current waveform
when the storage capacitor is discharged into a low
impedance.
IEC 61000-4-2 Contact Discharge
The IEC 61000-4-2 standard covers ESD testing and
performance of finished equipment. It does not specifi-
cally refer to integrated circuits. The major difference
between tests done using the Human Body Model and
IEC 61000-4-2 is a higher peak current in IEC 61000-4-
2 due to lower series resistance. Hence, the ESD with-
stand voltage measured to IEC 61000-4-2 is typically
lower than that measured using the Human Body
Model. Figure 11 shows the IEC 61000-4-2 model. The
Contact Discharge method connects the probe to the
device before the probe is charged. Figure 12 shows
the current waveform for the IEC 61000-4-2 Contact
Discharge Model.
ESD Test Conditions
ESD performance depends on a variety of conditions.
Please contact Maxim for a reliability report document-
ing test setup, methodology, and results.
Applications Information
Data Transfer in USB Mode
Transmitting Data to the USB
To transmit data to the USB, operate the MAX3349E in
USB mode (see the
Operating Modes section), and
drive OE low. The MAX3349E transmits data to the USB
differentially on D+ and D-. VP and VM serve as differ-
ential input signals to the driver. When VP and VM are
both driven low, a single-ended zero (SE0) is output on
D+/D-.
Receiving Data from the USB
To receive data from the USB, operate the MAX3349E
in USB mode (see the
Operating Modes section.) Drive
OE high and SUS low. Differential data received at
D+/D- appears as a logic signal at RCV. VP and VM are
the outputs of single-ended receivers on D+ and D-.
Data Transfer in UART Mode
In UART mode, D+ is an input and D- is an output.
UART signals on Tx are presented on D-, and signals
on D+ are presented on Rx. The UART signaling levels
for D+/D- are determined by VUART. The voltage
thresholds for Rx and Tx are determined by VL. The
voltage thresholds for D+ and D- are determined by
VUART.
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| MAX3349EETE+ | 功能描述:IC TXRX USB 2.0 FS 16-TQFN RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:25 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:4.5 V ~ 5.5 V 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 供应商设备封装:16-PDIP 包装:管件 |
| MAX3349EETE+T | 制造商:Maxim Integrated Products 功能描述:USB TRNSCVR 1TX 1RX 12MBPS 16TQFN EP - Tape and Reel |
| MAX334C/D | 制造商:Maxim Integrated Products 功能描述: |
| MAX334CJE | 功能描述:模拟开关 IC 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 |
| MAX334CPE | 功能描述:模拟开关 IC 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 |
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