MAX3349EA Datasheet, PDF (1/17 Pages) Maxim Integrated Products – USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode

19-0667; Rev 0; 10/06
USB 2.0 Full-Speed Transceiver with UART
Multiplexing Mode
General Description
The MAX3349EA ±15kV ESD-protected, USB transceiv-
er provides a full-speed USB interface to a lower voltage
microprocessor or ASIC. The device supports enumera-
tion, suspend, and VBUS detection. A special UART
multiplexing mode routes external UART signals (Rx and
Tx) to D+ and D-, allowing the use of a shared connec-
tor 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 MAX3349EA features a separate UART voltage sup-
ply input to support legacy devices using +2.75V signal-
ing. The MAX3349EA supports a maximum UART baud
rate of 921kbaud.
Upon connection to a USB host, the MAX3349EA enters
USB mode and provides a full-speed USB 2.0 compliant
interface through VP, VM, RCV, and OE. The
MAX3349EA features internal series termination resistors
on D+ and D-, and an internal 1.5kΩ pullup resistor to
D+ to allow the device to logically connect and discon-
nect from the USB while plugged in. A suspend mode is
provided for low-power operation. D+ and D- are pro-
tected from electrostatic discharge (ESD) up to ±15kV.
The MAX3349EA is available in 16-pin TQFN (4mm x
4mm) and 16-bump UCSP™ (2mm x 2mm) packages,
and is specified over the -40°C to +85°C extended tem-
perature range.
Applications
Cell Phones
PDAs
Digital Cameras
MP3 Players
Features
♦ ±15kV ESD HBM Protection on D+ and D-
♦ UART Mode Routes External UART Signals to
D+/D-
♦ Internal Linear Regulator Allows Direct Powering
from the USB Cable
♦ Separate Voltage Input for UART
Transmitter/Receiver (V_UART)
♦ Internal 1.5kΩ Pullup Resistor on D+ Controlled
by Enumerate Input
♦ Internal Series Termination Resistors on D+ and D-
♦ Complies with USB Specification Revision 2.0,
Full-Speed 12Mbps Operation
♦ Built-In Level Shifting Down to +1.4V, Ensuring
Compatibility with Low-Voltage ASICs
♦ V_BUS Detection
♦ Combined VP and VM Inputs/Outputs
♦ No Power-Supply Sequencing Required
♦ Available in 16-Bump UCSP (2mm x 2mm)
Package
Ordering Information
PART
PIN-PACKAGE PKG CODE
MAX3349EAEBE+T
16 UCSP
B16-1
MAX3349EAETE**
16 TQFN-EP*
T1644-4
Note: All devices specified for the -40°C to +85°C extended
temperature range.
**Future product—contact factory for availability.
*EP = Exposed paddle.
+Indicates lead-free package.
Pin Configurations
TOP VIEW
12
11
10
9
TOP VIEW
1
2
3
4
+
MAX3349EA
ENUM 13
*EP
8 SUS ^A
VUART
RX
TX
BD
VTRM ₁₄
VL 15
VM 16
+
MAX3349EA
1
2
3
4
7 OE
6 RCV
5 VP
TQFN-EP (4mm x 4mm)
*EXPOSED PADDLE—CONNECT TO GND OR LEAVE UNCONNECTED.
UCSP is a trademark of Maxim Integrated Products, Inc.
B
VL
VM
VP
RCV
C
VTRM
ENUM
SUS
OE
D
VBUS
D+
D-
GND
UCSP (2mm x 2mm)
(BUMPS ON BOTTOM OF DIE)
+ DENOTES LEAD-FREE PACKAGE.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.