MAX3349EETE+ Maxim Integrated Products, MAX3349EETE+ Datasheet - Page 9

• 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

The MAX3349E ±15kV ESD-protected, USB transceiver pro-
vides a full-speed USB interface to a microprocessor or
ASIC. The device supports enumeration, suspend, and
V
external UART signals (Rx and Tx) to D+ and D-, allowing
the use of a shared connector to reduce cost and part count
for mobile devices.
The UART interface allows mobile devices such as PDAs,
cellular phones, and digital cameras to use either UART or
USB signaling through the same connector. The MAX3349E
features a separate UART voltage supply input. The
Figure 5. Receiver Enable and Disable Timing
Figure 6. Test Circuit for Disable Time
BUS
OE
OE
VP/VM
VP/VM
detection. A special UART multiplexing mode routes
MAX3349E
t
t
PLZ_SE
PHZ_SE
USB 2.0 Full-Speed Transceiver with UART
D+/D-
_______________________________________________________________________________________
POINT
TEST
Detailed Description
C
50pF
L
220Ω
t
t
PZL_SE
PZH_SE
D+/D- CONNECTED TO GND,
VP/VM CONNECTED
TO PULLUP
D+/D- CONNECTED TO +3V,
VP/VM CONNECTED
TO PULLDOWN
1. DISABLE TIME (D+/D-)
MEASUREMENT
V = 0 FOR t
V = V
TRM
FOR t
PHZ
PLZ
MAX3349E supports a maximum UART baud rate of
921kbaud.
Upon connection to a USB host, the MAX3349E enters
USB mode and provides a full-speed USB 2.0 compli-
ant interface through VP, VM, RCV, and OE. The
MAX3349E features internal series resistors on D+ and
D-, and an internal 1.5kΩ pullup resistor to D+ to allow
the device to logically connect and disconnect from the
USB bus while plugged in. A suspend mode is provid-
ed for low-power operation. D+ and D- are protected
from electrostatic discharge (ESD) up to ±15kV. To
ensure full ±15kV ESD protection, bypass V
Figure 7. Test Circuit for Enable Time, Transmitter Propagation
Delay, and Transmitter Rise/Fall Time
Figure 8. Test Circuit for Receiver Propagation Delay
Figure 9. Human Body ESD Test Model
VOLTAGE
SOURCE
MAX3349E
HIGH-
DC
MAX3349E
Timing Diagrams (continued)
CHARGE-CURRENT-
Multiplexing Mode
LIMIT RESISTOR
RCV/VP/VM
1MΩ
D+/D-
R
C
100pF
C s
15kΩ
STORAGE
CAPACITOR
1.5kΩ
RESISTANCE
POINT
DISCHARGE
TEST
R
POINT
TEST
D
C
15pF
C
50pF
L
L
1. D+/D- TO RCV/VM/VP
PROPAGATION DELAYS
1. ENABLE TIME (D+/D-)
2. VP/VM TO D+/D-
3. D+/D- RISE/FALL TIMES
MEASUREMENT
PROPAGATION DELAY
BUS
DEVICE
UNDER
TEST
to GND
9