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.
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
Ordering Information
PART
MAX3349EAEBE+T
MAX3349EAETE**
PIN-PACKAGE
16 UCSP
16 TQFN-EP*
PKG CODE
B16-1
T1644-4
Applications
Cell Phones
PDAs
Digital Cameras
MP3 Players
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
V
BUS
GND
D+
D-
TOP VIEW
1
2
3
4
12
11
10
9
+
MAX3349EA
8
SUS
A
V
UART
RX
TX
BD
ENUM
13
*EP
V
TRM
14
7
OE
B
RCV
C
MAX3349EA
V
L
V
L
VM
VP
RCV
15
16
+
6
V
TRM
ENUM
SUS
OE
VM
5
VP
D
V
BUS
D+
D-
GND
1
V
UART
2
RX
3
TX
4
BD
UCSP (2mm x 2mm)
(BUMPS ON BOTTOM OF DIE)
+ DENOTES LEAD-FREE PACKAGE.
TQFN-EP (4mm x 4mm)
*EXPOSED PADDLE—CONNECT TO GND OR LEAVE UNCONNECTED.
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________
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.
USB 2.0 Full-Speed Transceiver with UART
Multiplexing Mode
MAX3349EA
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND, unless otherwise noted.)
V
UART
, V
L
, 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
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.
ELECTRICAL CHARACTERISTICS
(V
BUS
= +4.0V to +5.5V, V
UART
= +2.7V to +3.3V, V
L
= +1.40V to +2.75V, T
A
= -40°C to +85°C, unless otherwise noted. Typical val-
ues are at V
BUS
= +5V, V
L
= +1.8V, V
UART
= +2.75V (UART Mode), and T
A
= +25°C.) (Note 1)
PARAMETER
V
BUS
Input Range
V
L
Input Range
V
UART
Input Range
Regulated Supply-Voltage Output
Operating V
BUS
Supply Current
Operating V
UART
Supply Current
Static V
UART
Supply Current
Operating V
L
Supply Current
Full-Speed Idle and SE0 Supply
Current
Static V
L
Supply Current
Sharing Mode V
L
Supply Current
USB Suspend V
BUS
Supply
Current
V
BUS
DETECTION (BD)
USB Power-Supply Detection
Threshold
USB Power-Supply Detection
Hysteresis
V
L
Power-Supply Detection
Threshold
V
TH_VBUS
V
HYS_VBUS
V
TH_VL
V
L
= +1.8V
V
L
= +2.5V
V
L
= +1.8V
V
L
= +2.5V
1.8
2.3
2.7
3.2
80
100
0.7
3.4
4.0
V
mV
V
SYMBOL
V
BUS
V
L
V
UART
V
TRM
I
BUS
I
VUART
I
VUART(STATIC)
I
VL
UART mode
Internal regulator, USB mode
Full-speed transmitting/receiving at
12Mbps, C
L
= 50pF on D+ and D-
UART transmitting/receiving at
921kbaud, C
L
= 200pF
UART mode
Full-speed transmitting/receiving at
12Mbps, C
L
= 50pF on D+ and D-
Full-speed idle,
V
D+
> +2.7V, V
D-
< +0.3V
SE0: V
D+
< +0.3V, V
D-
< +0.3V
I
VL(STATIC)
I
VL(OFF)
I
VBUS(SUS)
Full-speed idle, SE0, suspend mode, or
static UART mode
V
BUS
and V
UART
not present
VM, VP unconnected;
OE
= 1, SUS = 1
290
340
2
2
38
3.5
USB mode
CONDITIONS
MIN
4.0
1.40
2.7
3.0
TYP
MAX
5.5
2.75
3.3
3.6
10
2.5
5
6
400
450
10
5
65
µA
µA
µA
UNITS
V
V
V
V
mA
mA
µA
mA
SUPPLY INPUTS/OUTPUTS (V
BUS
, V
UART
, V
TRM
, V
L
)
I
VBUS(IDLE)
µA
2
_______________________________________________________________________________________
USB 2.0 Full-Speed Transceiver with UART
Multiplexing Mode
ELECTRICAL CHARACTERISTICS (continued)
(V
BUS
= +4.0V to +5.5V, V
UART
= +2.7V to +3.3V, V
L
= +1.40V to +2.75V, T
A
= -40°C to +85°C, unless otherwise noted. Typical val-
ues are at V
BUS
= +5V, V
L
= +1.8V, V
UART
= +2.75V (UART Mode), and T
A
= +25°C.) (Note 1)
PARAMETER
V
UART
Power-Supply Detection
Threshold
SYMBOL
V
TH_UART
CONDITIONS
MIN
0.4 x
V
L
TYP
0.65 x
V
L
MAX
0.9 x
V
L
0.3 x
V
L
0.7 x
V
L
I
OL
= +2mA, V
L
> 1.65V
I
OL
= +1mA, V
L
< 1.65V
I
OH
= +2mA, V
L
> 1.65V
I
OH
= +1mA, V
L
< 1.65V
V
L
-
0.4
-1
|V
D+
- V
D-
|
Includes V
ID
range
0.2
0.8
2.5
0.8
2.0
R
L
= 1.5kΩ connected to +3.6V
R
L
= 15kΩ connected to GND
Steady-state drive
Measured from D+/D- to GND
Driver off
ENUM = 1
UART mode, +2.70 < V
UART
< +2.85V
UART mode,
+2.70V < V
UART
< +2.85V
UART mode,
+2.70V < V
UART
< +2.85V
I
UART_OH
= -2mA
UART mode,
+2.70V < V
UART
< +2.85V
I
UART_OL
= +2mA
2.2
0.9
1425
2.0
0.8
2.8
-10
29.0
38
20
1.3
1500
2.0
1575
0.3
3.6
+10
43.5
+1
0.4
UNITS
V
MAX3349EA
DIGITAL INPUTS/OUTPUTS (VP, VM, RCV, SUS,
OE,
RX, TX, ENUM, BD)
Input Voltage Low
Input Voltage High
Output Voltage Low
Output Voltage High
Input Leakage Current
Differential Input Sensitivity
Differential Common-Mode
Voltage
Single-Ended Input
Low Voltage
Single-Ended Input
High Voltage
USB Output Voltage Low
USB Output Voltage High
Off-State Leakage Current
Driver Output Impedance
Transceiver Capacitance
Input Impedance
D+ Internal Pullup Resistor
Input Voltage High
Input Voltage Low
V
IL
V
IH
V
OL
V
OH
I
LKG
V
ID
V
CM
V
ILSE
V
IHSE
V
USB_OLD
V
USB_OHD
I
LZ
Z
DRV
C
IND
Z
IN
R
PU
V
UART_IH
V
UART_IL
V
V
V
V
µA
V
V
V
V
V
V
µA
Ω
pF
MΩ
Ω
V
V
ANALOG INPUTS/OUTPUTS (D+, D- in USB Mode)
ANALOG INPUTS/OUTPUTS (D+, D- in UART Mode)
Output Voltage High
V
UART_OH
V
Output Voltage Low
V
UART_OL
0.4
V
_______________________________________________________________________________________
3
USB 2.0 Full-Speed Transceiver with UART
Multiplexing Mode
MAX3349EA
ELECTRICAL CHARACTERISTICS (continued)
(V
BUS
= +4.0V to +5.5V, V
UART
= +2.7V to +3.3V, V
L
= +1.40V to +2.75V, T
A
= -40°C to +85°C, unless otherwise noted. Typical val-
ues are at V
BUS
= +5V, V
L
= +1.8V, V
UART
= +2.75V (UART Mode), and T
A
= +25°C.) (Note 1)
PARAMETER
ESD PROTECTION (D+, D-)
Human Body Model
IEC 61000-4-2
Air-Gap Discharge
IEC 61000-4-2
Contact Discharge
(Figures 9 and 10)
±15
±8
±8
kV
kV
kV
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
TIMING CHARACTERISTICS
(V
BUS
= +4.0V to +5.5V, V
UART
= +2.7V to +3.3V, V
L
= +1.4V to +2.75V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values
are at V
BUS
= +5V, V
L
= +1.8V, V
UART
= +2.75V (UART Mode), and T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
10% to 90% of
|
V
USB_OHD
- V
USB_OLD
|
(Figures 1 and 7)
90% to 10% of
|
V
USB_OHD
- V
USB_OLD
|
(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)
V
L
> +1.65V (Figures 2 and 7)
+1.4V < V
L
< +1.65V (Figures 2 and 7)
V
L
> +1.65V (Figures 2 and 7)
+1.4V < V
L
< +1.65V (Figures 2 and 7)
High-to-off transition (Figures 3 and 6)
Low-to-off transition (Figures 3 and 6)
Off-to-high transition (Figures 3 and 7)
Off-to-low transition (Figures 3 and 7)
V
L
> +1.65V (Figures 4 and 8)
+1.4V < V
L
< +1.65V (Figures 4 and 8)
V
L
> +1.65V (Figures 4 and 8)
1.4V < V
L
< +1.65V (Figures 4 and 8)
V
L
> +1.65V (Figures 4 and 8)
+1.4V < V
L
< +1.65V (Figures 4 and 8)
V
L
> +1.65V (Figures 4 and 8)
+1.4V < V
L
< +1.65V (Figures 4 and 8)
MIN
TYP
MAX
UNITS
USB DRIVER CHARACTERISTICS (C
L
= 50pF)
Rise Time
Fall Time
Rise/Fall Time Matching
Output Signal Crossover Voltage
t
FR
t
FF
t
FR
/t
FF
V
CRS_F
t
PLH_DRV
Driver Propagation Delay
t
PHL_DRV
Driver Disable Delay
Driver Enable Delay
t
PHZ_DRV
t
PLZ_DRV
t
PZH_DRV
t
PZL_DRV
4
4
90
1.3
20
20
110
2.0
22.5
25
22.5
25
25
25
25
25
25
30
25
30
28
35
28
35
ns
ns
ns
ns
ns
ns
ns
%
V
USB RECEIVER CHARACTERISTICS (C
L
= 15pF)
Differential Receiver Propagation
Delay
t
PLH_RCV
t
PHL_RCV
t
PLH_SE
t
PHL_SE
Single-Ended Receiver
Propagation Delay
4
_______________________________________________________________________________________
USB 2.0 Full-Speed Transceiver with UART
Multiplexing Mode
TIMING CHARACTERISTICS (continued)
(V
BUS
= +4.0V to +5.5V, V
UART
= +2.7V to +3.3V, V
L
= +1.4V to +2.75V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values
are at V
BUS
= +5V, V
L
= +1.8V, V
UART
= +2.75V (UART Mode), and T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
High-to-off transition,
V
L
> +1.65V (Figure 5)
High-to-off transition,
+1.4V < V
L
< +1.65V (Figure 5)
Low-to-off transition,
V
L
> +1.65V (Figure 5)
Low-to-off transition,
+1.4V < V
L
< +1.65V (Figure 5)
Off-to-high transition,
V
L
> +1.65V (Figure 5)
Off-to-high transition,
+1.4V < V
L
< +1.65 (Figure 5)
Off-to-low transition,
V
L
> +1.65V (Figure 5)
Off-to-low transition,
+1.4V < V
L
< +1.65V (Figure 5)
10% to 90% of
|V
OHD
- V
OLD
| (Figure 13)
90% to 10% of
|V
OHD
- V
OLD
| (Figure 13)
(Figure 13)
(Figure 13)
(Figure 14)
(Figure 14)
(Figure 14)
(Figure 14)
60
60
70
70
MIN
TYP
MAX
10
12
ns
10
12
20
20
ns
20
20
UNITS
MAX3349EA
t
PHZ_SE
Single-Ended Receiver Disable
Delay
t
PLZ_SE
t
PZH_SE
Single-Ended Receiver Enable
Delay
t
PZL_SE
UART DRIVER CHARACTERISTICS (C
L
= 200pF)
Rise Time (D-)
Fall Time (D-)
Driver Propagation Delay
t
FR_TUART
t
FF_TUART
t
PLH_TUART
t
PHL_TUART
t
PLH_RUART
t
PHL_RUART
t
FR_RUART
t
FF_RUART
200
200
200
200
60
60
45
45
ns
ns
ns
UART RECEIVER CHARACTERISTICS (C
L
= 15pF)
Receiver (Rx) Propagation Delay
Receiver (Rx) Rise/Fall Time
ns
ns
Note 1:
Parameters are 100% production tested at T
A
=+25°C, unless otherwise noted. Limits over temperature are guaranteed
by design.
Note 2:
Guaranteed by design, not production tested.
_______________________________________________________________________________________
5
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