MAX3349EETE+ Maxim Integrated Products, MAX3349EETE+ Datasheet - Page 12

• Manufacturer Part Number: MAX3349EETE+
• Description: IC TXRX USB 2.0 FS 16-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX3349EETE+

• Number Of Drivers/receivers: 1/1
• Protocol: USB 2.0
• Voltage - Supply: 4 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

USB 2.0 Full-Speed Transceiver with UART
Multiplexing Mode
remains enabled in suspend mode to allow transmis-
sion of a remote wake-up on 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 V
determined by V
±15kV HBM.
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.
The bus-detect (BD) output is asserted logic-high when
a voltage greater than V
This is typically the case when the MAX3349E is con-
nected to a powered USB. BD is logic-low when V
is unconnected.
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:
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
1.5kΩ resistor. Figure 10 shows the current waveform
12
±15kV Human Body Model (HBM)
±8kV Air-Gap Discharge per IEC 61000-4-2
±8kV Contact Discharge per IEC 61000-4-2
______________________________________________________________________________________
UART
. Logic thresholds for Rx and Tx are
L
. D+ and D- are ESD protected to
TH-BUS
is presented on V
Human Body Model
ESD Protection
D+ and D-
RCV
BUS
BUS
BD
.
when the storage capacitor is discharged into a low
impedance.
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 performance depends on a variety of conditions.
Please contact Maxim for a reliability report document-
ing test setup, methodology, and results.
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-.
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-.
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 V
thresholds for Rx and Tx are determined by V
voltage thresholds for D+ and D- are determined by
V
Bypass V
ceramic capacitors. Additionally, bypass V
UART
.
BUS
, V
Applications Information
L
, and V
Data Transfer in UART Mode
IEC 61000-4-2 Contact Discharge
Data Transfer in USB Mode
Power-Supply Decoupling
Transmitting Data to the USB
Receiving Data from the USB
UART
ESD Test Conditions
to ground with 0.1µF
UART
. The voltage
TRM
L
. The
to