General Description

The MAX3349E ±15kV ESD-protected, USB transceiver

provides a full-speed USB interface to a lower voltage

microprocessor or ASIC. The device supports enumer-

ation, 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 con-

nector 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 sup-

ply input to support legacy devices using +2.75V signal-

ing. The 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-compliant

interface through VP, VM, RCV, and OE. The MAX3349E

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 disconnect from the

USB while plugged in. A suspend mode is provided for

low-power operation. D+ and D- are protected from

electrostatic discharge (ESD) up to ±15kV.

The MAX3349E 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

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

♦ 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

♦ Combined VP and VM Inputs/Outputs

♦ No Power-Supply Sequencing Required

♦ Available in 16-Bump UCSP (2mm x 2mm)

Package

Hi-Speed USB 2.0 Full-Speed Transceiver

with UART Multiplexing Mode

________________________________________________________________

Maxim Integrated Products

1

19-3952; Rev 1; 5/11

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

TQFN-EP

(4mm x 4mm)

ENUM

16

12

34

12

11

10

9

15

14

13

5

6

7

8

VM

VP

RCV

OE

SUS

MAX3349E

TOP VIEW

*EP

+

UCSP

(2mm x 2mm)

MAX3349E

TOP VIEW

(BUMPS ON BOTTOM OF DIE)

A

B

C

1

23

RX

TX

VP

ENUM

SUS

BD

VM

RCV

OE

4

D

D+

D-

GND

*CONNECT TO GND OR LEAVE UNCONNECTED.

+

PART

TEMP RANGE

PIN-PACKAGE

MAX3349EEBE-T

-40°C to +85°C

16 UCSP

MAX3349EEBE+T

-40°C to +85°C

16 UCSP

MAX3349EETE*

-40°C to +85°C

16 TQFN-EP**

Pin Configurations

UCSP is a trademark of Maxim Integrated Products, Inc.

*

Future product—contact factory for availability.

T = Tape and reel.

+

Denotes a lead(Pb)-free/RoHS-compliant package.

**

EP = Exposed pad.

Cell Phones

PDAs

Digital Cameras

MP3 Players