MAXIM MAX3349E User Manual

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 enumer­ation, 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 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 to support legacy devices using +2.75V signal­ing. 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 tem­perature 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

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

MAX3349E

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

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

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**

TOP VIEW

BUS

D+

D-

V

12 11 10 9

ENUM

13

*EP

V

TRM

14

V

15

L

VM

16

+

*CONNECT TO GND OR LEAVE UNCONNECTED.

MAX3349E

1234

RX

UART

V

TQFN-EP

(4mm x 4mm)

GND

SUS

8

OE

7

RCV

6

VP

5

TX

BD

TOP VIEW

(BUMPS ON BOTTOM OF DIE)

1

+

V

A

UART

V

L

B

V

C

TRM

D

V

BUS

23

MAX3349E

RX

TX

VM

VP

ENUM

SUS

D+

D-

UCSP

(2mm x 2mm)

4

BD

RCV

OE

GND

MAX3349E

Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

(All voltages referenced to GND, unless otherwise noted.)
V

UART

, VL, V

BUS

, D+, D- ..........................................-0.3V to +6V

V

TRM

.........................................................-0.3V to (V

BUS

+ 0.3V)

VP, VM, SUS, RX, TX, ENUM, RCV, OE, BD, -0.3V to (V

L

+ 0.3V)

Short Circuit Current (D+ and D-)...................................±150mA

Maximum Continuous Current (all other pins) .................±15mA

Continuous Power Dissipation (T

A

= +70°C)

UCSP (derate 8.2mW/°C above +70°C) ....................659.5mW

TQFN (derate 25.0mW/°C above +70°C) ...................2000mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature .....................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Bump Temperature (soldering, reflow) ............................+235°C

Soldering Temperature (reflow) .......................................+260°C

ELECTRICAL CHARACTERISTICS

(V

BUS

= +3.0V to +5.5V, V

UART

= +2.7V to +3.3V, VL= +1.40V to +2.75V, TA= -40°C to +85°C, unless otherwise noted. Typical val-

ues are at V

BUS

= +5V, VL= +1.8V, V

UART

= +2.75V (UART Mode), and TA= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SUPPLY INPUTS/OUTPUTS (V

V

Input Range V

BUS

VL Input Range V

V

Input Range V

UART

Regulated Supply-Voltage Output V

Oper at ing V

Oper at ing V

Static V

Supply Current I

BUS

Supply Current I

UART

Supply Current I

UART

Oper at ing VL Supply Current I

Ful l-Speed Idle and SE0 Supply
Current

Static VL Supply Current I

Sharing Mode VL Supply C urrent I

USB Suspend V

BUS

Supply

Current

V

DETECTION (BD)

BUS

USB Power-Supply Detection
Threshold

USB Power-Supply Detection
Hysteresis

VL Power-Supply Detect ion
Threshold

BUS

, V

, V

UART

BUS

UART

TRM

BUS

VUART

VUART(STATIC)

VL

, VL)

TRM

USB mode 3.0 5.5 V

L

4.5V  V

3.0V  V

UART mode 2.7 3.3 V

Internal regulator,
USB mode

Ful l-speed transmitting/receiving at
12Mbps, C

UART transmitting/receiving at
921kbaud, C

UART mode 3.5 5 µA

Ful l-speed transmitting/receiving at
12Mbps, C

Ful l-speed idle,

> +2.7V, V

V

I

VBUS(IDLE)

D+

SE0: VD+ < +0.3V, VD- < +0.3V 340 450

VL(STATIC)

VL(OFF)

I

VBUS(SU S)

V

TH_VBUS

V

HYS_ VBUS

V

TH_VL

Ful l-speed idle, SE0, suspend mode,
or static UART mode

V

BUS

and V

VM, VP unconnected;
OE = 1, SUS = 1

40 mV

0.7 V

 5.5V

BUS

 4.5V

BUS

V

BUS

V

BUS

= 50pF on D+ and D-

L

= 200pF

L

= 50pF on D+ and D-

L

< +0.3V

D-

> 4.5V 3.0 3.6

< 4.5V 2.8 3.6

1.40 2.75 V

10 mA

2.5 mA

6 mA

290 400

2 10 µA

not present 2 5 µA

UART

38 65 µA

0.4 x
V

L

0.9 x
V

L

V

µA

V

MAX3349E

Hi-Speed USB 2.0 Full-Speed Transceiver

with UART Multiplexing Mode

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V

BUS

= +3.0V to +5.5V, V

UART

= +2.7V to +3.3V, VL= +1.40V to +2.75V, TA= -40°C to +85°C, unless otherwise noted. Typical val-

ues are at V

BUS

= +5V, VL= +1.8V, V

UART

= +2.75V (UART Mode), and TA= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

V

Power-Supply Detect ion

UART

Threshold

DIGITAL INPUTS/OUTPUTS (VP, VM, RCV, SUS, OE, RX, TX, ENUM, BD)

Input-Voltage Low VIL

Input-Voltage High V

Output-Voltage Low V

Output-Voltage High V

Input Leakage Current I

ANALOG INPUTS/OUTPUTS (D+, D- in USB Mode)

Differential Input Sensitivity V

Differential Common-Mode
Voltage

Single-Ended Input
Low Voltage

Single-Ended Input
High Voltage

USB Output-Voltage Low V

USB Output-Voltage High V

Off-State Leakage Current ILZ -1 +1 µA

Driver Output Impedance Z

Transceiver Capacitance C

Input Impedance ZIN Driver off 1 M

D+ Internal Pullup Resistor RPU ENUM = 1 1425 1500 1575 

ANALOG INPUTS/OUTPUTS (D+, D- in UART Mode)

Input-Voltage High V

Input-Voltage Low V

Output-Voltage High V

V

TH_UART

0.4 x
V

L

0.65 x
V

L

0.9 x
V

L

0.3 x
V

L

0.7 x

IH

OL

OH

LKG

ID

V

CM

V

ILSE

V

IHSE

USB_OLD

USB_OHD

DRV

IND

UART_ IH

UART_ IL

IOL = +2mA, VL > 1.65V

= +1mA, VL < 1.65V

I

OL

IOH = +2m A, VL > 1.65V

= +1m A, VL < 1.65V

I

OH

-1 +1 µA

|VD+ - VD-| 0.2 V

Includes VIDrange 0.8 2.5 V

0.8 V

2.0 V

RL = 1.5k connected to +3.6V 0.3 V

RL = 15k connected to GND 2.8 3.6 V

Steady-state drive 28 43 

Measured from D+/D- to GND 20 pF

UART mode, +2.70 < V

< +2.85V 2.0 V

UART

UART mode,
+2.70V < V

UART

< +2.85V

V

V

L

0.4 V

V

-

L

0.4

V

0.8 V

UART mode,

UART_ OH

+2.70V < V
I

UART_OH

UART

= -2mA

< +2.85V

2.2 V

V

V

Output-Voltage Low V

UART_ OL

UART mode,
+2.70V < V
I

UART_OL

UART

= +2mA

< +2.85V

0.4 V

MAX3349E

Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(V

BUS

= +3.0V to +5.5V, V

UART

= +2.7V to +3.3V, VL= +1.40V to +2.75V, TA= -40°C to +85°C, unless otherwise noted. Typical val-

ues are at V

BUS

= +5V, VL= +1.8V, V

UART

= +2.75V (UART Mode), and TA= +25°C.) (Note 1)

TIMING CHARACTERISTICS

(V

BUS

= +3.0V to +5.5V, V

UART

= +2.7V to +3.3V, VL= +1.4V to +2.75V, TA= -40°C to +85°C, unless otherwise noted. Typical values

are at V

BUS

= +5V, VL= +1.8V, V

UART

= +2.75V (UART Mode), and TA= +25°C.) (Note 1)

ESD PROTECTION (D+, D-)

Human Body Model (Figures 9 and 10) ±15 kV

IEC 61000-4-2
Air-Gap Discharge

IEC 61000-4-2
Contact Discharge

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

USB DRIVER CHARACTERISTICS (CL = 50pF)

Rise Time t

Fall Time t

Rise/Fall Time Matching tFR/t

Output Signal Crossover Voltage V

Driver Propagation Delay

Driver Disable Delay

Driver Enable Delay

USB RECEIVER CHARACTERISTICS (CL = 15pF)

Differential Receiver Propagation
Delay

Single-Ended Receiver
Propagation Delay

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

±8 kV

±8 kV

FR

FF

FF

CRS_F

t

PLH_DRV

t

PHL_DRV

t

PHZ_DRV

t

PLZ_DRV

t

PZH_DRV

t

PZL_DRV

t

PLH_RCV

t

PHL_RCV

t

PLH_SE

t

PHL_SE

10% to 90% of | V
(Figures 1 and 7)

90% to 10% of | V
(Figures 1 and 7)

Excluding the first transition from idle
state (Note 2) (Figures 1 and 7)

Excluding the first transition from idle
state (Note 2) (Figure 2)

VL > +1.65V (Figures 2 and 7) 22.5

+1.4V < VL < +1.65V (Figures 2 and 7) 25

VL > +1.65V (Figures 2 and 7) 22.5

+1.4V < VL < +1.65V (Figures 2 and 7) 25

High-to-off transition (Figures 3 and 6) 25

Low-to-off transition (Figures 3 and 6) 25

Off-to-high transition (Figures 3 and 7) 25

Off-to-low transition (Figures 3 and 7) 25

VL > +1.65V (Figures 4 and 8) 25

+1.4V < VL < +1.65V (Figures 4 and 8) 30

VL > +1.65V (Figures 4 and 8) 25

1.4V < VL < +1.65V (Figures 4 and 8) 30

VL > +1.65V (Figures 4 and 8) 28

+1.4V < VL < +1.65V (Figures 4 and 8) 35

VL > +1.65V (Figures 4 and 8) 28

+1.4V < VL < +1.65V (Figures 4 and 8) 35

USB_OHD

USB_OHD

- V

USB_OLD

- V

USB_OLD

|

420ns

|

420ns

90 110 %

1.3 2.0 V

ns

ns

ns

ns

ns

MAX3349E

Hi-Speed USB 2.0 Full-Speed Transceiver

with UART Multiplexing Mode

_______________________________________________________________________________________ 5

TIMING CHARACTERISTICS (continued)

(V

BUS

= +3.0V to +5.5V, V

UART

= +2.7V to +3.3V, VL= +1.4V to +2.75V, TA= -40°C to +85°C, unless otherwise noted. Typical values

are at V

BUS

= +5V, VL= +1.8V, V

UART

= +2.75V (UART Mode), and TA= +25°C.) (Note 1)

Note 1: Parameters are 100% production tested at TA=+25°C, unless otherwise noted. Limits over temperature are guaranteed

by design.

Note 2: Guaranteed by design; not production tested.

Single-Ended Receiver Disable
Delay

Single-Ended Receiver Enable
Delay

UART DRIVER CHARACTERISTICS (CL = 200pF)

Rise Time (D-) t

Fall Time (D-) t

Driver Propagation Delay

UART RECEIVER CHARACTERISTICS (CL = 15pF)

Receiver (Rx) Propagation Delay

Receiver (Rx) Rise/Fall Time

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

High-to-off transition,
V

> +1.65V (Figure 5)

t

PHZ_SE

t

PLZ_SE

t

PZH_SE

t

PZL_SE

FR_TUART

FF_TUART

t

PLH_TUART

t

PHL_TUART

t

PLH_RUART

t

PHL_RUART

t

FR_RUART

t

FF_RUART

L

High-to-off transition,
+1.4V < V

Low-to-off transition,
V

> +1.65V (Figure 5)

L

Low-to-off transition,
+1.4V < V

Off-to-high transition,

> +1.65V (Figure 5)

V

L

Off-to-high transition,
+1.4V < V

Off-to-low transition,

> +1.65V (Figure 5)

V

L

Off-to-low transition,
+1.4V < V

10% to 90% of |V

90% to 10% of |V

(Figure 13) 70 200

(Figure 13) 70 200

(Figure 14) 60

(Figure 14) 60

(Figure 14) 45

(Figure 14) 45

< +1.65V (Figure 5)

L

< +1.65V (Figure 5)

L

< +1.65 (Figure 5)

L

< +1.65V (Figure 5)

L

- V

OHD

OLD

- V

OHD

OLD

10

12

ns

10

12

20

20

ns

20

20

| (Figure 13) 60 200 ns

| (Figure 13) 60 200 ns

ns

ns

ns

MAX3349E

Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode

6 _______________________________________________________________________________________

Typical Operating Characteristics

(V

BUS

= +5V, VL= +3.3V, V

UART

= +2.75V, TA= +25°C, unless otherwise noted.)

0

10

30

20

40

50

1.4 1.81.6 2.0 2.2 2.4 2.6

SINGLE-ENDED RECEIVER

PROPAGATION DELAY vs. V

L

MAX3349E toc01

VL (V)

PROPAGATION DELAY (ns)

TA = +85°C

TA = +25°C

TA = -40°C

12

14

18

16

20

22

4.00 4.504.25 4.75 5.00 5.25 5.50

SINGLE-ENDED RECEIVER

PROPAGATION DELAY vs. V

BUS

MAX3349E toc02

V

BUS

(V)

PROPAGATION DELAY (ns)

TA = +85°C

TA = +25°C

TA = -40°C

0

1

3

2

4

5

1.4 1.81.6 2.0 2.2 2.4 2.6

LOGIC CURRENT CONSUMPTION

IN SUSPEND MODE

MAX3349E toc03

VL (V)

I

VL

(µA)

30

33

32

31

34

35

36

37

38

39

40

4.00 4.504.25 4.75 5.00 5.25 5.50

V

BUS

CURRENT CONSUMPTION

IN SUSPEND MODE

MAX3349E toc04

V

BUS

(V)

I

VCC

(µA)

0.45

0.47

0.51

0.49

0.53

0.55

08040 120 160 200 240

VL CURRENT DURING USB OPERATION

vs. D+/D- CAPACITANCE

MAX3349E toc05

D+/D- CAPACITANCE (CL)

I

VL

(mA)

12Mbps DATA RATE
TRANSMITTING

0

4

12

8

16

20

08040 120 160 200 240

V

BUS

CURRENT DURING USB OPERATION

vs. D+/D- CAPACITANCE

MAX3349E toc06

D+/D- CAPACITANCE (CL)

I

VBUS

(mA)

12Mbps DATA RATE
TRANSMITTING

10ns/div

SUSPEND MODE

RCV
2V/div

SUS
2V/div

MAX3349E toc07

4µs/div

BUS DETECT RESPONSE

BD
1V/div

V

BUS

2V/div

MAX3349E toc08

MAX3349E

Hi-Speed USB 2.0 Full-Speed Transceiver

with UART Multiplexing Mode

_______________________________________________________________________________________ 7

Pin Description

PIN

UCSP TQFN

A1 1 POWER V

A2 2 OUTPUT RX

A3 3 INPUT TX UART Transmit Input. In UART mode, D- follows the logic state on TX.

A4 4 OUTPUT BD

B1 15 POWER V

B2 16 I/O VM

B3 5 I/O VP

B4 6 OUTPUT RCV

C1 14 POWER V

C2 13 INPUT ENUM

C3 8 INPUT SUS

C4 7 INPUT OE

D1 12 POWER V

D2 11 I/O D+ USB Differential Data Input/Output. Connect D+ directl y to the USB connector.

D3 10 I/O D- USB Differential Data Input/Output. Connect D- directly to the USB connector.

D4 9 POWER GND Ground

— EP — EP Exposed Pad. Connect exposed paddle to GND.

TYPE NAME FUNCTION

UART

L

TRM

BUS

UART Supply Voltage. V
Connect a regulated voltage between +2.7V and +3.3V to V
GND with a 0.1µF ceramic capacitor.

UART Receive Output. In UART mode, RX is a level- shifted output that expresse s
the logic state of D+.

USB Detect Output. When V
to indicate that the MAX3349E is connected to a USB host. The MAX3349E
operates in USB mode when BD is logic-high, and operates in UART mode when
BD is logic-low.

Digital Logic Supply. Connect a +1.4V to +2.75V supply to VL. Bypa ss VL to GND
with a 0.1µF or larger ceramic capacitor.

Receiver Output/Driver Input. VM functions as a receiver output when OE = V
follows the logic state of D- when receiving. VM functions as a driver input when
OE = GND (Tables 2 and 3).

Receiver Output/Driver Input. VP functions as a receiver output when OE = V
follows the logic state of D+ when receivi ng. VP functions as a driver input when
OE = GND (Tables 2 and 3).

Differential Receiver Output. In USB mode, RCV is the output of the USB
different ial receiver (Table 3).

Internal Regulator Output. V
to GND with a 1µF ceramic capacitor. V
external circuitry from V

Enumerate Input. Drive ENUM to V
to V

(when V

TRM

1.5k pullup resi stor. ENUM has no effect when the device is in UART mode.

Suspend Input. Dr ive SUS low for normal operation. Dri ve SUS high to force the
MAX3349E into suspend mode.

Output Enable. Drive OE low to set VP/VM to transmitter inputs in USB mode. Drive
OE high to set VP/VM to receiver outputs in USB mode. OE has no effect when the
device i s in UART mode.

USB Supply Voltage. V
USB mode. Bypass V

is present). Drive ENUM to GND to disconnect the internal

BUS

powers the internal UART transmitter and receiver.

UART

exceeds the V

BUS

provides a regulated +3.3V output. Bypas s V

TRM

.

TRM

to connect the internal 1.5k res istor from D+

L

provides power to the internal linear regulator when in

BUS

to GND with a 0.1µF ceramic capacitor.

BUS

draws power from V

TRM

. Bypass V

UART

threshold, BD is logic-high

TH-BUS

BUS

. Do not power

UART

. VM

L

. VP

L

TRM

to

MAX3349E

Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode

8 _______________________________________________________________________________________

Figure 1. Rise and Fall Times

Figure 2. Timing of VP and VM to D+ and D-

Figure 3. Driver Enable and Disable Timing

Figure 4. D+/D- Timing to VP, VM, and RCV

Timing Diagrams

, t

t

FR

FR_TUART

V

, V

OHD

USB_OHD

V

, V

OLD

USB_OLD

VM

10%

90%

tFF, t

FF_TUART

90%

10%

VP AND VM RISE/FALL TIMES < 4ns

OE

D+/D-

OE

D+/D-

t

PLZ_DRV

t

PHZ_DRV

t

PZL_DRV

t

PZH_DRV

+3V

VP/VM CONNECTED TO GND,
D+/D- CONNECTED
TO PULLUP

CONNECTED TO VL,

VP/VM
D+/D- CONNECTED
TO PULLDOWN

INPUT RISE/FALL TIME < 4ns

VP

t

PLH_DRV

D-

V

CRS_F

D+

t

PHL_DRV

D+/D-

0V

V

L

t

,

PLH_RCV

t

PLH_SE

RCV, VM, AND VP

t

PHL_RCV

t

PHL_SE

,

MAX3349E

Hi-Speed USB 2.0 Full-Speed Transceiver

with UART Multiplexing Mode

_______________________________________________________________________________________ 9

Detailed Description

The MAX3349E ±15kV ESD-protected, USB transceiver pro­vides a full-speed USB interface to a microprocessor or
ASIC. The device supports enumeration, suspend, and
V

BUS

detection. A special UART multiplexing mode routes
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

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 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 provid­ed for low-power operation. D+ and D- are protected
from electrostatic discharge (ESD) up to ±15kV. To
ensure full ±15kV ESD protection, bypass V

BUS

to GND

Figure 5. Receiver Enable and Disable Timing

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

Timing Diagrams (continued)

Figure 6. Test Circuit for Disable Time

OE

D+/D- CONNECTED TO GND,
VP/VM CONNECTED
TO PULLUP

VP/VM

OE

VP/VM

t

PLZ_SE

t

PHZ_SE

t

PZL_SE

t

PZH_SE

D+/D­VP/VM CONNECTED
TO PULLDOWN

TEST

220Ω

POINT

MAX3349E

D+/D-

C

L

50pF

1. DISABLE TIME (D+/D-)
MEASUREMENT

CONNECTED TO +3V,

V = 0 FOR t

PHZ

V = V

FOR t

TRM

TEST

POINT

MAX3349E

D+/D-

15kΩ

MAX3349E

RCV/VP/VM

R

C

Ω

1M

CHARGE-CURRENT-

LIMIT RESISTOR

HIGH-

VOLTAGE

DC

SOURCE

PLZ

100pF

C

s

R

D

1.5k

DISCHARGE

RESISTANCE

STORAGE
CAPACITOR

1. ENABLE TIME (D+/D-)
MEASUREMENT

2. VP/VM TO D+/D-

C

PROPAGATION DELAY

L

50pF

3. D+/D- RISE/FALL TIMES

TEST

POINT

C

L

15pF

Ω

1. D+/D- TO RCV/VM/VP
PROPAGATION DELAYS

DEVICE
UNDER

TEST

MAX3349E

Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode

10 ______________________________________________________________________________________

with a 0.1µF ceramic capacitor as close to the device
as possible.

Operating Modes

The MAX3349E operates in either USB mode or UART
mode, depending on the presence or absence of
V

BUS

. Bus detect output BD is logic-high when a volt-

age higher than V

TH-VBUS

is applied to V

BUS

, and

logic-low otherwise. The MAX3349E operates in USB

mode when BD is logic-high, and UART mode when
BD is logic-low.

USB Mode

In USB mode, the MAX3349E implements a full-speed
(12Mbps) USB interface on D+ and D-, with enumerate
and suspend functions. A differential USB receiver pre­sents the USB state as a logic-level output RCV
(Table 3a). VP/VM are outputs of single-ended USB
receivers when OE is logic-high, allowing detection of
single-ended 0 (SE0) events. When OE is logic-low, VP
and VM serve as inputs to the USB transmitter. Drive
suspend input SUS logic-high to force the MAX3349E
into a low-power operating mode and disable the differ­ential USB receiver (Table 3b).

UART Mode

The MAX3349E operates in UART mode when BD is
logic-low (V

BUS

not present). The Rx signal is the out­put of a single-ended receiver on D+, and the Tx input
is driven out on D-. Signaling voltage thresholds for D+
and D- are determined by V

UART

, an externally applied

voltage between +2.7V and +3.3V.

Power-Supply Configurations

VLLogic Supply

In both USB and UART modes, the control interface is
powered from VL. The MAX3349E operates with logic­side voltage (VL) as low as +1.4V, providing level shift­ing for lower voltage ASICs and microcontrollers.

Timing Diagrams (continued)

Figure 10. Human Body Model Current Waveform

Figure 11. IEC61000-4-2 ESD Contact Discharge Test Model

Figure 12. IEC 61000-4-2 Contact Discharge Model Current
Waveform

I

IP 100%

90%

PEAK-TO-PEAK RINGING

I

r

(NOT DRAWN TO SCALE)

100%

90%

AMPERES

HIGH-

VOLTAGE

DC

SOURCE

36.8%

10%

0

0

50MΩ to 100MΩ

CHARGE-CURRENT-

LIMIT RESISTOR

t

RL

R

C

150pF

C

s

TIME

t

DL

CURRENT WAVEFORM

R

D

330Ω

DISCHARGE

RESISTANCE

STORAGE
CAPACITOR

DEVICE
UNDER

TEST

PEAK

I

10%

tR = 0.7ns to 1ns

30ns

60ns

t

MAX3349E

Hi-Speed USB 2.0 Full-Speed Transceiver

with UART Multiplexing Mode

______________________________________________________________________________________ 11

USB Mode

The MAX3349E is in USB mode when V

BUS

is greater

than V

TH-BUS

and the bus detect output (BD) is logic­high. In USB mode, power for the MAX3349E is derived
from V

BUS

, typically provided through the USB connec­tor. An internal linear regulator generates the required
+3.3V V

TRM

voltage from V

BUS

. V

TRM

powers the inter­nal USB transceiver circuitry and the D+ enumeration
resistor. Bypass V

TRM

to GND with a 1µF ceramic
capacitor as close to the device as possible. Do not
power external circuitry from V

TRM

.

Disable Mode

Connect V

BUS

to a system power supply and leave V

L

unconnected or connect to ground to enter disable
mode. In disable mode, D+ and D- are high imped­ance, and withstand external signals up to +5.5V. OE,
SUS, and control signals are ignored.

UART Mode

Connect VLand V

UART

to system power supplies, and

leave V

BUS

unconnected or below V

TH-BUS

to operate
the MAX3349E in UART mode. The MAX3349E sup­ports V

UART

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 logic­high, VP and VM operate as logic outputs, and D+/D­are 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 1.5kΩ
pullup resistor from D+ to V

TRM

. Drive ENUM logic-low
to disable the internal pullup resistor and logically dis­connect the MAX3349E from the USB.

SUS

Operate the MAX3349E in low-power USB suspend
mode by driving SUS logic-high. In suspend mode, the
USB differential receiver is turned off and V

BUS

con­sumes 38µA (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

Table 1. Power-Supply Configuration

Table 2. USB Transmit Truth Table (OE = 0)

Table 3a. USB Receive Truth Table (OE = 1,
SUS = 0)

Table 3b. USB Receive Truth Table (OE = 1,
SUS = 1)

*

= Last State

X = Undefined

V

BUS

(V) V

TRM

(V) VL(V) V

UART

(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

+3.0 to +5.5 +2.8 to +3.6 +1.4 to +2.75 GND or Unconnected Battery 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

INPUTS OUTPUTS

VP VM D+ D-

000 0

010 1

101 0

111 1

INPUTS OUTPUTS

D+ D- VP VM RCV

00000

01010

10100

11110

INPUTS OUTPUTS

D+ D- VP VM RCV

0000RCV*

01010

10101

1111X

MAX3349E

Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode

12 ______________________________________________________________________________________

remains enabled in suspend mode to allow transmis­sion of a remote wake-up on D+ and D-.

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 deter­mined by V

UART

. Logic thresholds for Rx and Tx are
determined by VL. D+ and D- are ESD protected to
±15kV HBM.

RCV

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.

BD

The bus-detect (BD) output is asserted logic-high when
a voltage greater than V

TH-BUS

is presented on V

BUS

.
This is typically the case when the MAX3349E is con­nected to a powered USB. BD is logic-low when V

BUS

is unconnected.

ESD Protection

As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro­static 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:

±15kV Human Body Model (HBM)

±8kV Air-Gap Discharge per IEC 61000-4-2

±8kV Contact Discharge per IEC 61000-4-2

Human Body Model

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
when the storage capacitor is discharged into a low
impedance.

IEC 61000-4-2 Contact Discharge

The IEC 61000-4-2 standard covers ESD testing and
performance of finished equipment. It does not specifi­cally 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 61000-4­2 due to lower series resistance. Hence, the ESD with­stand 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 Test Conditions

ESD performance depends on a variety of conditions.
Please contact Maxim for a reliability report document­ing test setup, methodology, and results.

Applications Information

Data Transfer in USB Mode

Transmitting Data to the USB

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 differ­ential input signals to the driver. When VP and VM are
both driven low, a single-ended zero (SE0) is output on
D+/D-.

Receiving Data from the USB

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-.

Data Transfer in UART Mode

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

UART

. The voltage
thresholds for Rx and Tx are determined by VL. The
voltage thresholds for D+ and D- are determined by
V

UART

.

MAX3349E

Hi-Speed USB 2.0 Full-Speed Transceiver

with UART Multiplexing Mode

______________________________________________________________________________________ 13

Power-Supply Decoupling

Bypass V

BUS

, VL, and V

UART

to ground with 0.1µF

ceramic capacitors. Additionally, bypass V

TRM

to
ground with a 1µF ceramic capacitor. Place all bypass
capacitors as close as possible to the device .

Power Sequencing

There are no power-sequencing requirements for VL,
V

UART

, and V

BUS

.

UCSP Application Information

For the latest application details on UCSP construction,
dimensions, tape carrier information, printed circuit­board techniques, bump-pad layout, and recommend­ed reflow temperature profile, as well as the latest
information on reliability testing results, refer to
the Application Note

UCSP- A Wafer-Level Chip-

Scale Package

available on Maxim’s website at

www.maxim-ic.com/ucsp

.

Figure 13. UART Transmitter Timing

Figure 14. UART Receiver Timing

Timing Diagrams

TX

D-

10%

50%

t

PLH_TUART

50%

t

FR_TUART

90%

50%

90%

t

PHL_TUART

50%

10%

t

FF_TUART

D+

RX

10%

50%

t

PLH_RUART

50%

50%

90%

t

FR_RUART

90%

t

PHL_RUART

50%

10%

t

FF_RUART

MAX3349E

Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode

14 ______________________________________________________________________________________

Typical Operating Circuit

Chip Information

PROCESS: BiCMOS

Package Information

For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.com/packages

. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.

PACKAGE

TYPE

PACKAGE

CODE

OUTLINE

NO.

LAND

PATTERN NO.

16 UCSP B16+1

21-0101

Refer to

Application

Note 1891

16 TQFN-EP T1644+4

21-0139 90-0070

V

V

L

UART

0.1µF

VP

USB SERIAL-

INTERFACE

ENGINE (SIE)

ASIC

UART

MICROCONTROLLER

VM

OE

RCV

RX

TX

ENUM

SUS

BD

0.1µF

V

TRM

1µF

V

MAX3349E

D+ / RX

D- / TX

BUS

0.1µF

USB/UART

CONNECTOR

MAX3349E

Hi-Speed USB 2.0 Full-Speed Transceiver

with UART Multiplexing Mode

______________________________________________________________________________________ 15

Functional Diagram

ENUM

RX

TX

VP

VM

V

L

LEVEL

SHIFTING

V

UART

UART Rx

UART Tx

V

TRM

USB
DIFFERENTIAL
TRANSMITTER

3.3V

LINEAR

REGULATOR

V

BUS

VTH_VBUS

1.5kΩ

35Ω

35Ω

BD

D+

D-

D+

RECEIVER

OE

D-

SUS

RCV

RECEIVER

USB

RECEIVER

GND

MAX3349E

MAX3349E

Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

16

____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

Revision History

REVISION

NUMBER

03/06Initi al rel ease —

15/11

REVISION

DATE

DESCRIPTION

Added MAX3349EEBE+T to the Ordering Information and adjusted specifications in
the Electrical Characteristics

PAGES

CHANGED

1, 2