Maxim MAX3349EAETE, MAX3349EA Datasheet

General Description

The MAX3349EA ±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 MAX3349EA features a separate UART voltage sup­ply input to support legacy devices using +2.75V signal­ing. 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 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 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 tem­perature 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

MAX3349EA

USB 2.0 Full-Speed Transceiver with UART

Multiplexing Mode

________________________________________________________________ Maxim Integrated Products 1

19-0667; Rev 0; 10/06

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.

Ordering Information

TQFN-EP (4mm x 4mm)

ENUM

16

1234

12 11 10 9

15

14

13

5

6

7

8

VM

V

L

V

TRM

V

BUS

D+

D-

GND

RX

TX

BD

VP

RCV

OE

SUS

V

UART

MAX3349EA

TOP VIEW

*EP

+

UCSP (2mm x 2mm)

(BUMPS ON BOTTOM OF DIE)

MAX3349EA

TOP VIEW

A

B

C

1

23

RX

TX

V

UART

VP

V

L

ENUM

SUS

V

TRM

BD

VM

RCV

OE

4

D

D+

D-

V

BUS

GND

*EXPOSED PADDLE—CONNECT TO GND OR LEAVE UNCONNECTED.

+

+ DENOTES LEAD-FREE PACKAGE.

Pin Configurations

UCSP is a trademark of Maxim Integrated Products, Inc.

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.

PART PIN-PACKAGE PKG CODE

MAX3349EAEBE+T 16 UCSP B16-1

MAX3349EAETE** 16 TQFN-EP* T1644-4

MAX3349EA

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)

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

16-Pin 4mm x 4mm 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

ELECTRICAL CHARACTERISTICS

(V

BUS

= +4.0V 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

BUS

, V

UART

, V

TRM

, VL)

V

BUS

Input Range V

BUS

USB mode 4.0 5.5 V

VL Input Range V

L

V

V

UART

Input Range V

UART

UART mode 2.7 3.3 V

Regulated Supply-Voltage Output

V

TRM

Internal regulator, USB mode 3.0 3.6 V

Operating V

BUS

Supply Current I

BUS

Full-speed transmitting/receiving at
12Mbps, C

L

= 50pF on D+ and D-

10 mA

Operating V

UART

Supply Current

I

VUART

UART transmitting/receiving at
921kbaud, C

L

= 200pF

2.5 mA

Static V

UART

Supply Current

)

UART mode 3.5 5 µA

Operating VL Supply Current I

VL

Full-speed transmitting/receiving at
12Mbps, C

L

= 50pF on D+ and D-

6mA

Full-speed idle,
V

D+

> +2.7V, V

D-

< +0.3V

400

Full-Speed Idle and SE0 Supply
Current

I

VBUS(IDLE)

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

450

µA

Static VL Supply Current I

VL(STATIC)

Full-speed idle, SE0, suspend mode, or
static UART mode

210µA

Sharing Mode VL Supply Current

I

VL(OFF)

V

BUS

and V

UART

not present 2 5 µA

USB Suspend V

BUS

Supply

Current

I

VBUS(SUS)

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

38 65 µA

V

BUS

DETECTION (BD)

VL = +1.8V 1.8 2.7 3.4

USB Power-Supply Detection
Threshold

V

TH_VBUS

VL = +2.5V 2.3 3.2 4.0

V

VL = +1.8V 80

USB Power-Supply Detection
Hysteresis

V

HYS_VBUS

VL = +2.5V

mV

VL Power-Supply Detection
Threshold

V

TH_VL

0.7 V

1.40 2.75

I

VUART(STATIC

290

340

100

MAX3349EA

USB 2.0 Full-Speed Transceiver with UART

Multiplexing Mode

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V

BUS

= +4.0V 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

UNITS

V

UART

Power-Supply Detection

Threshold

V

TH_UART

0.4 x
V

L

0.65 x
V

L

0.9 x
V

L

V

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

Input Voltage Low V

IL

0.3 x
V

L

V

Input Voltage High V

IH

0.7 x
V

L

V

Output Voltage Low V

OL

IOL = +2mA, VL > 1.65V
I

OL

= +1mA, VL < 1.65V

0.4 V

Output Voltage High V

OH

IOH = +2mA, VL > 1.65V
I

OH

= +1mA, VL < 1.65V

V

L

­V

Input Leakage Current I

LKG

-1 +1 µA

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

Differential Input Sensitivity V

ID

|VD+ - VD-| 0.2 V

Differential Common-Mode
Voltage

V

CM

Includes V

ID

range 0.8 2.5 V

Single-Ended Input
Low Voltage

V

ILSE

0.8 V

Single-Ended Input
High Voltage

V

IHSE

2.0 V

USB Output Voltage Low V

USB_OLD

RL = 1.5kΩ connected to +3.6V 0.3 V

USB Output Voltage High V

USB_OHD

RL = 15kΩ connected to GND 2.8 3.6 V

Off-State Leakage Current I

LZ

-10

µA

Driver Output Impedance Z

DRV

Steady-state drive

38

Ω

Transceiver Capacitance C

IND

Measured from D+/D- to GND 20 pF

Input Impedance Z

IN

Driver off 0.9 1.3 2.0 MΩ

D+ Internal Pullup Resistor R

PU

ENUM = 1

Ω

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

Input Voltage High V

UART_IH

2.0 V

Input Voltage Low V

UART_IL

UART mode,
+2.70V < V

UART

< +2.85V

0.8 V

Output Voltage High V

UART_OH

UART mode,
+2.70V < V

UART

< +2.85V

I

UART_OH

= -2mA

2.2 V

Output Voltage Low V

UART_OL

UART mode,
+2.70V < V

UART

< +2.85V

I

UART_OL

= +2mA

0.4 V

UART mode, +2.70 < V

MIN TYP MAX

0.4

29.0

1425 1500 1575

< +2.85V

UART

+10

43.5

MAX3349EA

USB 2.0 Full-Speed Transceiver with UART
Multiplexing Mode

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(V

BUS

= +4.0V 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

ESD PROTECTION (D+, D-)

Human Body Model (Figures 9 and 10)

kV

IEC 61000-4-2
Air-Gap Discharge

±8 kV

IEC 61000-4-2
Contact Discharge

±8 kV

TIMING CHARACTERISTICS

(V

BUS

= +4.0V 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)

PARAMETER SYMBOL CONDITIONS

UNITS

USB DRIVER CHARACTERISTICS (CL = 50pF)

Rise Time t

FR

10% to 90% of | V

USB_OHD

- V

USB_OLD

|

(Figures 1 and 7)

420ns

Fall Time t

FF

90% to 10% of | V

USB_OHD

- V

USB_OLD

|

(Figures 1 and 7)

420ns

Rise/Fall Time Matching tFR/t

FF

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

90

%

Output Signal Crossover Voltage

V

CRS_F

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

1.3 2.0 V

VL > +1.65V (Figures 2 and 7)

t

PLH_DRV

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

VL > +1.65V (Figures 2 and 7)

Driver Propagation Delay

t

PHL_DRV

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

ns

t

PHZ_DRV

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

Driver Disable Delay

t

PLZ_DRV

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

ns

t

PZH_DRV

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

Driver Enable Delay

t

PZL_DRV

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

ns

USB RECEIVER CHARACTERISTICS (CL = 15pF)

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

t

PLH_RCV

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

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

Differential Receiver Propagation
Delay

t

PHL_RCV

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

ns

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

t

PLH_SE

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

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

Single-Ended Receiver
Propagation Delay

t

PHL_SE

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

ns

MIN TYP MAX

±15

110

22.5

22.5

MAX3349EA

USB 2.0 Full-Speed Transceiver with UART

Multiplexing Mode

_______________________________________________________________________________________ 5

TIMING CHARACTERISTICS (continued)

(V

BUS

= +4.0V 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)

PARAMETER SYMBOL CONDITIONS

MIN

TYP

MAX

UNITS

High-to-off transition,
V

L

> +1.65V (Figure 5)

10

t

PHZ_SE

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

L

< +1.65V (Figure 5)

12

Low-to-off transition,
V

L

> +1.65V (Figure 5)

10

Single-Ended Receiver Disable
Delay

t

PLZ_SE

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

L

< +1.65V (Figure 5)

12

ns

Off-to-high transition,
V

L

> +1.65V (Figure 5)

20

t

PZH_SE

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

L

< +1.65 (Figure 5)

20

Off-to-low transition,
V

L

> +1.65V (Figure 5)

20

Single-Ended Receiver Enable
Delay

t

PZL_SE

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

L

< +1.65V (Figure 5)

20

ns

UART DRIVER CHARACTERISTICS (CL = 200pF)

Rise Time (D-) t

FR_TUART

60

ns

Fall Time (D-) t

FF_TUART

60

ns

(Figure 13) 70

Driver Propagation Delay

(Figure 13) 70

ns

UART RECEIVER CHARACTERISTICS (CL = 15pF)

(Figure 14) 60

Receiver (Rx) Propagation Delay

(Figure 14) 60

ns

t

FR_RUART

(Figure 14) 45

Receiver (Rx) Rise/Fall Time

t

FF_RUART

(Figure 14) 45

ns

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.

10% to 90% of |V

90% to 10% of |V

t

PLH_TUART

t

PHL_TUART

t

PLH_RUART

t

PHL_RUART

OHD

OHD

- V

- V

| (Figure 13)

OLD

| (Figure 13)

OLD

200

200

200

200

MAX3349EA

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

MAX3349EA 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

MAX3349EA 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

MAX3349EA 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

MAX3349EA 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

MAX3349EA 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

MAX3349EA toc06

D+/D- CAPACITANCE (CL)

I

VBUS

(mA)

12Mbps DATA RATE
TRANSMITTING

10ns/div

SUSPEND MODE

RCV
2V/div

SUS
2V/div

MAX3349EA toc07

4µs/div

BUS DETECT RESPONSE

BD
1V/div

V

BUS

2V/div

MAX3349EA toc08