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参数资料
| 型号： | MAX3349EAEBE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/17页 |
| 文件大小： | 0K |
| 描述： | IC TXRX USB 2.0 FS 16-UCSP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 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-WFBGA，CSPBGA |
| 供应商设备封装： | 16-UCSP（2x2） |
| 包装： | 带卷 (TR) |
MAX3349EA
USB 2.0 Full-Speed Transceiver with UART
Multiplexing Mode
______________________________________________________________________________________
11
USB Mode
The MAX3349EA is in USB mode when VBUS is greater
than VTH-BUS and the bus detect output (BD) is logic-
high. In USB mode, power for the MAX3349EA is
derived from VBUS, typically provided through the USB
connector. An internal linear regulator generates the
required +3.3V VTRM voltage from VBUS. VTRM powers
the internal USB transceiver circuitry and the D+ enu-
meration resistor. Bypass VTRM to GND with a 1F
ceramic capacitor as close to the device as possible.
Do not power external circuitry from VTRM.
Disable Mode
Connect VBUS to a system power supply and leave VL
unconnected or connect to ground to enter disable
mode. In disable mode, D+ and D- are high imped-
ance, and withstand external signals up to +5.5V. OE,
SUS, and control signals are ignored.
UART Mode
Connect VL and VUART to system power supplies, and
leave VBUS unconnected or below VTH-BUS to operate
the MAX3349EA in UART mode. The MAX3349EA sup-
ports VUART from +2.7V to +3.3V (see Table 1).
USB Control Signals
OE
OE controls the direction of communication for USB
mode. When OE is logic-low, VP and VM operate as
logic inputs, and D+/D- are outputs. When OE is logic-
high, VP and VM operate as logic outputs, and D+/D-
are inputs. RCV is the output of the differential USB
receiver connected to D+/D-, and is not affected by the
OE logic level.
ENUM
Drive ENUM logic-high to enable the internal 1.5k
pullup resistor from D+ to VTRM. Drive ENUM logic-low
to disable the internal pullup resistor and logically dis-
connect the MAX3349EA from the USB.
SUS
Operate the MAX3349EA in low-power USB suspend
mode by driving SUS logic-high. In suspend mode, the
USB differential receiver is turned off and VBUS con-
sumes 38A (typ) of supply current. The single-ended
VP and VM receivers remain active to detect a SE0
state on USB bus lines D+ and D-. The USB transmitter
remains enabled in suspend mode to allow transmis-
sion of a remote wake-up on D+ and D-.
VBUS(V)
VTRM(V)
VL(V)
VUART(V)
CONFIGURATION
+4.0 to +5.5
+3.0 to +3.6 Output
+1.4 to +2.75
GND, Unconnected, or
+2.7V to +3.3V
USB Mode
+4.0 to +5.5
+3.0 to +3.6 Output
GND or Unconnected
GND, Unconnected, or
+2.7V to +3.3V
Disable Mode
GND or Unconnected
High Impedance
+1.4 to +2.75
+2.7V to +3.3V
UART Mode
Table 1. Power-Supply Configuration
INPUTS
OUTPUTS
VP
VM
D+
D-
00
0
01
0
1
10
1
0
11
1
Table 2. USB Transmit Truth Table (
OE = 0)
INPUTS
OUTPUTS
D+
D-
VP
VM
RCV
0000
RCV*
0101
0
1010
1
1111X
Table 3a. USB Receive Truth Table (
OE = 1,
SUS = 0)
INPUTS
OUTPUTS
D+
D-
VP
VM
RCV
0000
0
0101
0
1010
0
1111
0
Table 3b. USB Receive Truth Table (
OE = 1,
SUS = 1)
* = Last state.
X = Undefined.
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