MAXIM MAX3349EETE

19-3952; Rev 1; 5/11
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
Features
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.
♦ ±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 (VUART)
♦ 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
♦ VBUS Detection
♦ Combined VP and VM Inputs/Outputs
♦ No Power-Supply Sequencing Required
♦ Available in 16-Bump UCSP (2mm x 2mm)
Package
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
Cell Phones
PDAs
Digital Cameras
MP3 Players
Ordering Information
TEMP RANGE
PIN-PACKAGE
MAX3349EEBE-T
PART
-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**
*Future product—contact factory for availability.
T = Tape and reel.
+Denotes a lead(Pb)-free/RoHS-compliant package.
**EP = Exposed pad.
Pin Configurations
ENUM
13
VTRM
14
VBUS
D+
D-
GND
TOP VIEW
12
11
10
9
*EP
TOP VIEW
(BUMPS ON BOTTOM OF DIE)
1
8
SUS
7
OE
RCV
VM
16
5
VP
VUART
2
3
4
BD
6
TX
15
RX
VL
1
TQFN-EP
(4mm x 4mm)
3
4
MAX3349E
MAX3349E
+
2
+
A
VUART
RX
TX
BD
B
VL
VM
VP
RCV
C
VTRM
ENUM
SUS
OE
D
VBUS
D+
D-
GND
UCSP
(2mm x 2mm)
*CONNECT TO GND OR LEAVE UNCONNECTED.
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
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.
1
MAX3349E
General Description
MAX3349E
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND, unless otherwise noted.)
VUART, VL, VBUS, D+, D- ..........................................-0.3V to +6V
VTRM .........................................................-0.3V to (VBUS + 0.3V)
VP, VM, SUS, RX, TX, ENUM, RCV, OE, BD, -0.3V to (VL + 0.3V)
Short Circuit Current (D+ and D-)...................................±150mA
Maximum Continuous Current (all other pins) .................±15mA
Continuous Power Dissipation (TA = +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
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
(VBUS = +3.0V to +5.5V, VUART = +2.7V to +3.3V, VL = +1.40V to +2.75V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VBUS = +5V, VL = +1.8V, VUART = +2.75V (UART Mode), and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
3.0
5.5
V
1.40
2.75
V
V
SUPPLY INPUTS/OUTPUTS (VBUS, VUART, VTRM, V L)
VBUS Input Range
VL Input Range
VUART Input Range
VBUS
VL
VUART
USB mode
4.5V VBUS 5.5V
3.0V VBUS 4.5V
UART mode
2.7
3.3
VBUS > 4.5V
3.0
3.6
VBUS < 4.5V
2.8
3.6
Regulated Supply-Voltage Output
VTRM
Internal regulator,
USB mode
Operating VBUS Supply Current
IBUS
Full-speed transmitting/receiving at
12Mbps, CL = 50pF on D+ and D-
10
mA
Operating VUART Supply Current
I VUART
UART transmitting/receiving at
921kbaud, CL = 200pF
2.5
mA
5
µA
6
mA
Static VUART Supply Current
I VUART(STATIC)
Operating VL Supply Current
I VL
Full-Speed Idle and SE0 Supply
Current
Static VL Supply Current
Sharing Mode VL Supply Current
USB Suspend VBUS Supply
Current
I VBUS(IDLE)
I VL(STATIC)
I VL(OFF)
I VBUS(SUS)
UART mode
3.5
Full-speed transmitting/receiving at
12Mbps, CL = 50pF on D+ and D-
V
Full-speed idle,
VD+ > +2.7V, VD- < +0.3V
290
400
SE0: VD+ < +0.3V, VD- < +0.3V
340
450
Full-speed idle, SE0, suspend mode,
or static UART mode
2
10
µA
VBUS and VUART not present
2
5
µA
VM, VP unconnected;
OE = 1, SUS = 1
38
65
µA
0.9 x
VL
V
µA
VBUS DETECTION (BD)
USB Power-Supply Detection
Threshold
VTH_VBUS
USB Power-Supply Detection
Hysteresis
VHYS_VBUS
40
mV
VTH_VL
0.7
V
VL Power-Supply Detection
Threshold
2
0.4 x
VL
_______________________________________________________________________________________
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
(VBUS = +3.0V to +5.5V, VUART = +2.7V to +3.3V, VL = +1.40V to +2.75V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VBUS = +5V, VL = +1.8V, VUART = +2.75V (UART Mode), and TA = +25°C.) (Note 1)
PARAMETER
VUART Power-Supply Detection
Threshold
SYMBOL
CONDITIONS
VTH_UART
MIN
TYP
MAX
UNITS
0.4 x
VL
0.65 x
VL
0.9 x
VL
V
0.3 x
VL
V
DIGITAL INPUTS/OUTPUTS (VP, VM, RCV, SUS, OE, RX, TX, ENUM, BD)
Input-Voltage Low
VIL
Input-Voltage High
VIH
Output-Voltage Low
VOL
I OL = +2mA, VL > 1.65V
I OL = +1mA, VL < 1.65V
Output-Voltage High
VOH
I OH = +2mA, VL > 1.65V
I OH = +1mA, VL < 1.65V
Input Leakage Current
ILKG
0.7 x
VL
V
0.4
VL 0.4
V
V
-1
+1
µA
ANALOG INPUTS/OUTPUTS (D+, D- in USB Mode)
Differential Input Sensitivity
VID
|VD+ - VD-|
0.2
Differential Common-Mode
Voltage
VCM
Includes VID range
0.8
Single-Ended Input
Low Voltage
VILSE
Single-Ended Input
High Voltage
VIHSE
V
2.5
V
0.8
V
2.0
USB Output-Voltage Low
VUSB_OLD
RL = 1.5k connected to +3.6V
USB Output-Voltage High
VUSB_OHD
RL = 15k connected to GND
Off-State Leakage Current
ILZ
Driver Output Impedance
ZDRV
Steady-state drive
Transceiver Capacitance
CIND
Measured from D+/D- to GND
V
0.3
V
2.8
3.6
V
-1
+1
µA
28
43
20
Input Impedance
ZIN
Driver off
1
D+ Internal Pullup Resistor
RPU
ENUM = 1
1425
pF
M
1500
1575
ANALOG INPUTS/OUTPUTS (D+, D- in UART Mode)
Input-Voltage High
VUART_IH
UART mode, +2.70 < VUART < +2.85V
Input-Voltage Low
VUART_IL
UART mode,
+2.70V < VUART < +2.85V
Output-Voltage High
VUART_OH
UART mode,
+2.70V < VUART < +2.85V
IUART_OH = -2mA
Output-Voltage Low
VUART_OL
UART mode,
+2.70V < VUART < +2.85V
IUART_OL = +2mA
2.0
V
0.8
2.2
V
V
0.4
V
_______________________________________________________________________________________
3
MAX3349E
ELECTRICAL CHARACTERISTICS (continued)
MAX3349E
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
ELECTRICAL CHARACTERISTICS (continued)
(VBUS = +3.0V to +5.5V, VUART = +2.7V to +3.3V, VL = +1.40V to +2.75V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VBUS = +5V, VL = +1.8V, VUART = +2.75V (UART Mode), and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ESD PROTECTION (D+, D-)
Human Body Model
±15
kV
IEC 61000-4-2
Air-Gap Discharge
(Figures 9 and 10)
±8
kV
IEC 61000-4-2
Contact Discharge
±8
kV
TIMING CHARACTERISTICS
(VBUS = +3.0V to +5.5V, VUART = +2.7V to +3.3V, VL = +1.4V to +2.75V, TA = -40°C to +85°C, unless otherwise noted. Typical values
are at VBUS = +5V, VL = +1.8V, VUART = +2.75V (UART Mode), and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
USB DRIVER CHARACTERISTICS (CL = 50pF)
Rise Time
tFR
10% to 90% of | VUSB_OHD - VUSB_OLD |
(Figures 1 and 7)
4
20
ns
Fall Time
tFF
90% to 10% of | VUSB_OHD - VUSB_OLD |
(Figures 1 and 7)
4
20
ns
Rise/Fall Time Matching
tFR/tFF
Excluding the first transition from idle
state (Note 2) (Figures 1 and 7)
90
110
%
Output Signal Crossover Voltage
VCRS_F
Excluding the first transition from idle
state (Note 2) (Figure 2)
1.3
2.0
V
tPLH_DRV
Driver Propagation Delay
tPHL_DRV
Driver Disable Delay
Driver Enable Delay
VL > +1.65V (Figures 2 and 7)
+1.4V < VL < +1.65V (Figures 2 and 7)
VL > +1.65V (Figures 2 and 7)
22.5
25
22.5
+1.4V < VL < +1.65V (Figures 2 and 7)
25
tPHZ_DRV
High-to-off transition (Figures 3 and 6)
25
tPLZ_DRV
Low-to-off transition (Figures 3 and 6)
25
tPZH_DRV
Off-to-high transition (Figures 3 and 7)
25
tPZL_DRV
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
ns
ns
ns
USB RECEIVER CHARACTERISTICS (CL = 15pF)
Differential Receiver Propagation
Delay
tPLH_RCV
tPHL_RCV
Single-Ended Receiver
Propagation Delay
tPLH_SE
tPHL_SE
4
+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
_______________________________________________________________________________________
ns
ns
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
(VBUS = +3.0V to +5.5V, VUART = +2.7V to +3.3V, VL = +1.4V to +2.75V, TA = -40°C to +85°C, unless otherwise noted. Typical values
are at VBUS = +5V, VL = +1.8V, VUART = +2.75V (UART Mode), and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
tPHZ_SE
Single-Ended Receiver Disable
Delay
tPLZ_SE
tPZH_SE
Single-Ended Receiver Enable
Delay
tPZL_SE
CONDITIONS
MIN
TYP
MAX
High-to-off transition,
VL > +1.65V (Figure 5)
10
High-to-off transition,
+1.4V < VL < +1.65V (Figure 5)
12
Low-to-off transition,
VL > +1.65V (Figure 5)
10
Low-to-off transition,
+1.4V < VL < +1.65V (Figure 5)
12
Off-to-high transition,
VL > +1.65V (Figure 5)
20
Off-to-high transition,
+1.4V < VL < +1.65 (Figure 5)
20
Off-to-low transition,
VL > +1.65V (Figure 5)
20
Off-to-low transition,
+1.4V < VL < +1.65V (Figure 5)
20
UNITS
ns
ns
UART DRIVER CHARACTERISTICS (CL = 200pF)
Rise Time (D-)
Fall Time (D-)
Driver Propagation Delay
tFR_TUART
10% to 90% of |VOHD - VOLD| (Figure 13)
tFF_TUART
60
200
ns
ns
90% to 10% of |VOHD - VOLD| (Figure 13)
60
200
tPLH_TUART
(Figure 13)
70
200
tPHL_TUART
(Figure 13)
70
200
ns
UART RECEIVER CHARACTERISTICS (CL = 15pF)
Receiver (Rx) Propagation Delay
Receiver (Rx) Rise/Fall Time
tPLH_RUART
(Figure 14)
60
tPHL_RUART
(Figure 14)
60
tFR_RUART
(Figure 14)
45
tFF_RUART
(Figure 14)
45
ns
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.
_______________________________________________________________________________________
5
MAX3349E
TIMING CHARACTERISTICS (continued)
Typical Operating Characteristics
(VBUS = +5V, VL = +3.3V, VUART = +2.75V, TA = +25°C, unless otherwise noted.)
SINGLE-ENDED RECEIVER
PROPAGATION DELAY vs. VL
30
TA = +25°C
20
20
18
TA = +25°C
4
16
3
2
TA = -40°C
14
10
MAX3349E toc03
TA = +85°C
IVL (µA)
TA = +85°C
5
MAX3349E toc02
40
22
PROPAGATION DELAY (ns)
MAX3349E toc01
PROPAGATION DELAY (ns)
LOGIC CURRENT CONSUMPTION
IN SUSPEND MODE
SINGLE-ENDED RECEIVER
PROPAGATION DELAY vs. VBUS
50
1
TA = -40°C
12
0
1.6
1.8
2.0
2.2
2.4
0
4.00
2.6
4.25
4.50
4.75
5.00
5.25
5.50
1.4
1.6
1.8
2.0
2.2
2.4
2.6
VL (V)
VBUS (V)
VL (V)
VBUS CURRENT CONSUMPTION
IN SUSPEND MODE
VL CURRENT DURING USB OPERATION
vs. D+/D- CAPACITANCE
VBUS CURRENT DURING USB OPERATION
vs. D+/D- CAPACITANCE
39
38
12Mbps DATA RATE
TRANSMITTING
20
0.53
MAX3349E toc06
0.55
MAX3349E toc04
40
MAX3349E toc05
1.4
12Mbps DATA RATE
TRANSMITTING
16
IVL (mA)
36
35
34
IVBUS (mA)
37
IVCC (µA)
MAX3349E
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
0.51
0.49
12
8
33
32
4
0.47
31
0
0.45
30
4.00
4.25
4.50
4.75
5.00
5.25
5.50
0
40
VBUS (V)
80
120
160
200
240
0
40
80
120
160
D+/D- CAPACITANCE (CL)
D+/D- CAPACITANCE (CL)
BUS DETECT RESPONSE
SUSPEND MODE
MAX3349E toc08
MAX3349E toc07
SUS
2V/div
VBUS
2V/div
RCV
2V/div
10ns/div
6
BD
1V/div
4µs/div
_______________________________________________________________________________________
200
240
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
PIN
TYPE
NAME
FUNCTION
1
POWER
VUART
UART Supply Voltage. VUART powers the internal UART transmitter and receiver.
Connect a regulated voltage between +2.7V and +3.3V to VUART. Bypass VUART to
GND with a 0.1µF ceramic capacitor.
A2
2
OUTPUT
RX
UART Receive Output. In UART mode, RX is a level-shifted output that expresses
the logic state of D+.
A3
3
INPUT
TX
UART Transmit Input. In UART mode, D- follows the logic state on TX.
UCSP
TQFN
A1
A4
4
OUTPUT
BD
USB Detect Output. When VBUS exceeds the VTH-BUS threshold, BD is logic-high
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.
B1
15
POWER
VL
Digital Logic Supply. Connect a +1.4V to +2.75V supply to VL. Bypass VL to GND
with a 0.1µF or larger ceramic capacitor.
B2
16
I/O
VM
Receiver Output/Driver Input. VM functions as a receiver output when OE = VL. VM
follows the logic state of D- when receiving. VM functions as a driver input when
OE = GND (Tables 2 and 3).
B3
5
I/O
VP
Receiver Output/Driver Input. VP functions as a receiver output when OE = VL. VP
follows the logic state of D+ when receiving. VP functions as a driver input when
OE = GND (Tables 2 and 3).
B4
6
OUTPUT
RCV
Differential Receiver Output. In USB mode, RCV is the output of the USB
differential receiver (Table 3).
C1
14
POWER
VTRM
Internal Regulator Output. VTRM provides a regulated +3.3V output. Bypass VTRM
to GND with a 1µF ceramic capacitor. VTRM draws power from VBUS. Do not power
external circuitry from VTRM.
C2
13
INPUT
ENUM
Enumerate Input. Drive ENUM to VL to connect the internal 1.5k resistor from D+
to VTRM (when VBUS is present). Drive ENUM to GND to disconnect the internal
1.5k pullup resistor. ENUM has no effect when the device is in UART mode.
C3
8
INPUT
SUS
Suspend Input. Drive SUS low for normal operation. Drive SUS high to force the
MAX3349E into suspend mode.
C4
7
INPUT
OE
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 is in UART mode.
D1
12
POWER
VBUS
D2
11
I/O
D+
D3
10
I/O
D-
D4
9
POWER
GND
—
EP
—
EP
USB Supply Voltage. VBUS provides power to the internal linear regulator when in
USB mode. Bypass VBUS to GND with a 0.1µF ceramic capacitor.
USB Differential Data Input/Output. Connect D+ directly to the USB connector.
USB Differential Data Input/Output. Connect D- directly to the USB connector.
Ground
Exposed Pad. Connect exposed paddle to GND.
_______________________________________________________________________________________
7
MAX3349E
Pin Description
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
MAX3349E
Timing Diagrams
OE
tFR, tFR_TUART
tFF, tFF_TUART
VP/VM CONNECTED TO GND,
D+/D- CONNECTED
TO PULLUP
VUSB_OHD, VOHD
90%
90%
D+/D-
10%
10%
tPLZ_DRV
VUSB_OLD, VOLD
tPZL_DRV
VP/VM CONNECTED TO VL,
D+/D- CONNECTED
TO PULLDOWN
OE
Figure 1. Rise and Fall Times
D+/D-
tPHZ_DRV
tPZH_DRV
Figure 3. Driver Enable and Disable Timing
VP AND VM RISE/FALL TIMES < 4ns
VM
INPUT RISE/FALL TIME < 4ns
+3V
D+/D-
VP
tPLH_DRV
tPHL_DRV
0V
D-
VCRS_F
VL
tPLH_RCV,
tPLH_SE
D+
RCV, VM, AND VP
Figure 2. Timing of VP and VM to D+ and D-
8
Figure 4. D+/D- Timing to VP, VM, and RCV
_______________________________________________________________________________________
tPHL_RCV,
tPHL_SE
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
TEST
POINT
OE
MAX3349E
1. ENABLE TIME (D+/D-)
MEASUREMENT
D+/DCL
50pF
15kΩ
D+/D- CONNECTED TO GND,
VP/VM CONNECTED
TO PULLUP
VP/VM
2. VP/VM TO D+/DPROPAGATION DELAY
3. D+/D- RISE/FALL TIMES
Figure 7. Test Circuit for Enable Time, Transmitter Propagation
Delay, and Transmitter Rise/Fall Time
tPLZ_SE
tPZL_SE
D+/D- CONNECTED TO +3V,
VP/VM CONNECTED
TO PULLDOWN
OE
TEST
POINT
MAX3349E
1. D+/D- TO RCV/VM/VP
PROPAGATION DELAYS
RCV/VP/VM
CL
15pF
VP/VM
Figure 8. Test Circuit for Receiver Propagation Delay
tPHZ_SE
tPZH_SE
RC
1MΩ
Figure 5. Receiver Enable and Disable Timing
CHARGE-CURRENTLIMIT RESISTOR
TEST
POINT
MAX3349E
220Ω
D+/DCL
50pF
1. DISABLE TIME (D+/D-)
MEASUREMENT
V = 0 FOR tPHZ
V = VTRM FOR tPLZ
Figure 6. Test Circuit for Disable Time
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
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. The
HIGHVOLTAGE
DC
SOURCE
Cs
100pF
RD
1.5kΩ
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
Figure 9. Human Body ESD Test Model
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 VBUS to GND
_______________________________________________________________________________________
9
MAX3349E
Timing Diagrams (continued)
Timing Diagrams (continued)
IP 100%
90%
I
100%
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Ir
IPEAK
MAX3349E
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
AMPERES
36.8%
10%
0
10%
0
tRL
TIME
tR = 0.7ns to 1ns
tDL
CURRENT WAVEFORM
t
30ns
60ns
Figure 10. Human Body Model Current Waveform
Figure 12. IEC 61000-4-2 Contact Discharge Model Current
Waveform
mode when BD is logic-high, and UART mode when
BD is logic-low.
RC
50MΩ to 100MΩ
CHARGE-CURRENTLIMIT RESISTOR
HIGHVOLTAGE
DC
SOURCE
Cs
150pF
RD
330Ω
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
Figure 11. IEC61000-4-2 ESD Contact Discharge Test Model
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
VBUS. Bus detect output BD is logic-high when a voltage higher than V TH-VBUS is applied to V BUS , and
logic-low otherwise. The MAX3349E operates in USB
10
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 (VBUS 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 VUART, an externally applied
voltage between +2.7V and +3.3V.
Power-Supply Configurations
VL Logic 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.
______________________________________________________________________________________
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
MAX3349E
Table 1. Power-Supply Configuration
VBUS(V)
VTRM(V)
VL(V)
VUART(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
Table 2. USB Transmit Truth Table (OE = 0)
INPUTS
OUTPUTS
Table 3b. USB Receive Truth Table (OE = 1,
SUS = 1)
INPUTS
OUTPUTS
VP
VM
D+
D-
0
0
0
0
D+
D-
VP
VM
RCV
0
1
0
1
0
0
0
0
0
1
0
1
0
0
1
0
1
0
1
1
1
1
1
0
1
0
0
1
1
1
1
0
Table 3a. USB Receive Truth Table (OE = 1,
SUS = 0)
INPUTS
OUTPUTS
D+
D-
VP
VM
RCV
0
0
0
0
RCV*
0
1
0
1
0
1
0
1
0
1
1
1
1
1
X
* = Last State
X = Undefined
USB Mode
The MAX3349E is in USB mode when VBUS is greater
than VTH-BUS and the bus detect output (BD) is logichigh. In USB mode, power for the MAX3349E is derived
from VBUS, typically provided through the USB connector. An internal linear regulator generates the required
+3.3V VTRM voltage from VBUS. VTRM 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 VTRM.
Disable Mode
Connect VBUS to a system power supply and leave VL
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 VL and VUART to system power supplies, and
leave VBUS unconnected or below VTH-BUS to operate
the MAX3349E in UART mode. The MAX3349E supports VUART 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 VTRM. 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 VBUS 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
______________________________________________________________________________________
11
MAX3349E
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
remains enabled in suspend mode to allow transmission of a remote wake-up on D+ and D-.
D+ and DD+ 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 VUART. 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 VTH-BUS is presented on VBUS.
This is typically the case when the MAX3349E is connected to a powered USB. BD is logic-low when VBUS
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
12
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
VUART.
______________________________________________________________________________________
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
TX
50%
D+
50%
50%
50%
tPLH_RUART
tPLH_TUART
tPHL_RUART
tPHL_TUART
90%
90%
D-
90%
50%
50%
10%
10%
tFR_TUART
tFF_TUART
RX
90%
50%
50%
10%
10%
tFR_RUART
tFF_RUART
Figure 14. UART Receiver Timing
Figure 13. UART Transmitter Timing
Power-Supply Decoupling
UCSP Application Information
Bypass V BUS , V L , 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 .
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 ChipScale Package available on Maxim’s website at
www.maxim-ic.com/ucsp.
Power Sequencing
There are no power-sequencing requirements for VL,
VUART, and VBUS.
______________________________________________________________________________________
13
MAX3349E
Timing Diagrams
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
MAX3349E
Typical Operating Circuit
VL
VUART
0.1µF
0.1µF
VP
USB SERIALINTERFACE
ENGINE (SIE)
VM
OE
RCV
VTRM
1µF
ASIC
RX
UART
TX
VBUS
MAX3349E
0.1µF
ENUM
SUS
D+ / RX
D- / TX
USB/UART
CONNECTOR
MICROCONTROLLER
BD
Chip Information
PROCESS: BiCMOS
14
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
______________________________________________________________________________________
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
VL
VTRM
VUART
LEVEL
SHIFTING
VBUS
3.3V
LINEAR
REGULATOR
ENUM
BD
VTH_VBUS
RX
UART Rx
1.5kΩ
TX
UART Tx
35Ω
VP
USB
DIFFERENTIAL
TRANSMITTER
35Ω
D+
D-
VM
D+
RECEIVER
OE
SUS
RCV
DRECEIVER
MAX3349E
USB
RECEIVER
GND
______________________________________________________________________________________
15
MAX3349E
Functional Diagram
MAX3349E
Hi-Speed USB 2.0 Full-Speed Transceiver
with UART Multiplexing Mode
Revision History
PAGES
CHANGED
REVISION
NUMBER
REVISION
DATE
0
3/06
Initial release
—
5/11
Added MAX3349EEBE+T to the Ordering Information and adjusted specifications in
the Electrical Characteristics
1, 2
1
DESCRIPTION
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.
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