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19-0667; Rev 0; 10/06
USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode
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 1.5k 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 UCSPTM (2mm x 2mm) packages, and is specified over the -40C to +85C extended temperature 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 (VUART) Internal 1.5k 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
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 -40C to +85C extended temperature range. **Future product--contact factory for availability. *EP = Exposed paddle. +Indicates lead-free package.
Pin Configurations
TOP VIEW VBUS GND D+ DTOP VIEW 1 2 3 4
12
11
10
9
+
MAX3349EA
8 SUS A VUART RX TX BD
ENUM
13
*EP
VTRM
14
7
OE B RCV C
MAX3349EA
VL
VL
VM
VP
RCV
15 16 +
6
VTRM
ENUM
SUS
OE
VM
5
VP D VBUS D+ DGND
1 VUART
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.) 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 = +70C) 16-Bump UCSP (derate 8.2mW/C above +70C) ....659.5mW 16-Pin 4mm x 4mm TQFN (derate 25.0mW/C above +70C).............................................................2000mW Operating Temperature Range ...........................-40C to +85C Junction Temperature .....................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Bump Temperature (soldering, reflow) ............................+235C
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 = +4.0V to +5.5V, VUART = +2.7V to +3.3V, VL = +1.40V to +2.75V, TA = -40C to +85C, unless otherwise noted. Typical values are at VBUS = +5V, VL = +1.8V, VUART = +2.75V (UART Mode), and TA = +25C.) (Note 1)
PARAMETER VBUS Input Range VL Input Range VUART Input Range Regulated Supply-Voltage Output Operating VBUS Supply Current Operating VUART Supply Current Static VUART Supply Current Operating VL Supply Current Full-Speed Idle and SE0 Supply Current Static VL Supply Current Sharing Mode VL Supply Current USB Suspend VBUS Supply Current VBUS DETECTION (BD) USB Power-Supply Detection Threshold USB Power-Supply Detection Hysteresis VL Power-Supply Detection Threshold VTH_VBUS VHYS_VBUS VTH_VL VL = +1.8V VL = +2.5V VL = +1.8V VL = +2.5V 1.8 2.3 2.7 3.2 80 100 0.7 3.4 4.0 V mV V SYMBOL VBUS VL VUART VTRM IBUS IVUART IVUART(STATIC) IVL UART mode Internal regulator, USB mode Full-speed transmitting/receiving at 12Mbps, CL = 50pF on D+ and DUART transmitting/receiving at 921kbaud, CL = 200pF UART mode Full-speed transmitting/receiving at 12Mbps, CL = 50pF on D+ and DFull-speed idle, VD+ > +2.7V, VD- < +0.3V SE0: VD+ < +0.3V, VD- < +0.3V IVL(STATIC) IVL(OFF) IVBUS(SUS) Full-speed idle, SE0, suspend mode, or static UART mode VBUS and VUART 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 A A A UNITS V V V V mA mA A mA
SUPPLY INPUTS/OUTPUTS (VBUS, VUART, VTRM, VL)
IVBUS(IDLE)
A
2
_______________________________________________________________________________________
USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode
ELECTRICAL CHARACTERISTICS (continued)
(VBUS = +4.0V to +5.5V, VUART = +2.7V to +3.3V, VL = +1.40V to +2.75V, TA = -40C to +85C, unless otherwise noted. Typical values are at VBUS = +5V, VL = +1.8V, VUART = +2.75V (UART Mode), and TA = +25C.) (Note 1)
PARAMETER VUART Power-Supply Detection Threshold SYMBOL VTH_UART CONDITIONS MIN 0.4 x VL TYP 0.65 x VL MAX 0.9 x VL 0.3 x VL 0.7 x VL IOL = +2mA, VL > 1.65V IOL = +1mA, VL < 1.65V IOH = +2mA, VL > 1.65V IOH = +1mA, VL < 1.65V VL 0.4 -1 |VD+ - VD-| Includes VID range 0.2 0.8 2.5 0.8 2.0 RL = 1.5k connected to +3.6V RL = 15k connected to GND Steady-state drive Measured from D+/D- to GND Driver off ENUM = 1 UART mode, +2.70 < VUART < +2.85V UART mode, +2.70V < VUART < +2.85V UART mode, +2.70V < VUART < +2.85V IUART_OH = -2mA UART mode, +2.70V < VUART < +2.85V IUART_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 VIL VIH VOL VOH ILKG VID VCM VILSE VIHSE VUSB_OLD VUSB_OHD ILZ ZDRV CIND ZIN RPU VUART_IH VUART_IL V V V V A V V V V V V A pF M V V
ANALOG INPUTS/OUTPUTS (D+, D- in USB Mode)
ANALOG INPUTS/OUTPUTS (D+, D- in UART Mode)
Output Voltage High
VUART_OH
V
Output Voltage Low
VUART_OL
0.4
V
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3
USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode MAX3349EA
ELECTRICAL CHARACTERISTICS (continued)
(VBUS = +4.0V to +5.5V, VUART = +2.7V to +3.3V, VL = +1.40V to +2.75V, TA = -40C to +85C, unless otherwise noted. Typical values are at VBUS = +5V, VL = +1.8V, VUART = +2.75V (UART Mode), and TA = +25C.) (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
(VBUS = +4.0V to +5.5V, VUART = +2.7V to +3.3V, VL = +1.4V to +2.75V, TA = -40C to +85C, unless otherwise noted. Typical values are at VBUS = +5V, VL = +1.8V, VUART = +2.75V (UART Mode), and TA = +25C.) (Note 1)
PARAMETER SYMBOL CONDITIONS 10% to 90% of | VUSB_OHD - VUSB_OLD | (Figures 1 and 7) 90% to 10% of | VUSB_OHD - VUSB_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) VL > +1.65V (Figures 2 and 7) +1.4V < VL < +1.65V (Figures 2 and 7) VL > +1.65V (Figures 2 and 7) +1.4V < VL < +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) VL > +1.65V (Figures 4 and 8) +1.4V < VL < +1.65V (Figures 4 and 8) VL > +1.65V (Figures 4 and 8) 1.4V < VL < +1.65V (Figures 4 and 8) VL > +1.65V (Figures 4 and 8) +1.4V < VL < +1.65V (Figures 4 and 8) VL > +1.65V (Figures 4 and 8) +1.4V < VL < +1.65V (Figures 4 and 8) MIN TYP MAX UNITS
USB DRIVER CHARACTERISTICS (CL = 50pF) Rise Time Fall Time Rise/Fall Time Matching Output Signal Crossover Voltage tFR tFF tFR/tFF VCRS_F tPLH_DRV Driver Propagation Delay tPHL_DRV Driver Disable Delay Driver Enable Delay tPHZ_DRV tPLZ_DRV tPZH_DRV tPZL_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 (CL = 15pF) Differential Receiver Propagation Delay tPLH_RCV tPHL_RCV tPLH_SE tPHL_SE
Single-Ended Receiver Propagation Delay
4
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USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode
TIMING CHARACTERISTICS (continued)
(VBUS = +4.0V to +5.5V, VUART = +2.7V to +3.3V, VL = +1.4V to +2.75V, TA = -40C to +85C, unless otherwise noted. Typical values are at VBUS = +5V, VL = +1.8V, VUART = +2.75V (UART Mode), and TA = +25C.) (Note 1)
PARAMETER SYMBOL CONDITIONS High-to-off transition, VL > +1.65V (Figure 5) High-to-off transition, +1.4V < VL < +1.65V (Figure 5) Low-to-off transition, VL > +1.65V (Figure 5) Low-to-off transition, +1.4V < VL < +1.65V (Figure 5) Off-to-high transition, VL > +1.65V (Figure 5) Off-to-high transition, +1.4V < VL < +1.65 (Figure 5) Off-to-low transition, VL > +1.65V (Figure 5) Off-to-low transition, +1.4V < VL < +1.65V (Figure 5) 10% to 90% of |VOHD - VOLD| (Figure 13) 90% to 10% of |VOHD - VOLD| (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
tPHZ_SE Single-Ended Receiver Disable Delay tPLZ_SE
tPZH_SE Single-Ended Receiver Enable Delay tPZL_SE
UART DRIVER CHARACTERISTICS (CL = 200pF) Rise Time (D-) Fall Time (D-) Driver Propagation Delay tFR_TUART tFF_TUART tPLH_TUART tPHL_TUART tPLH_RUART tPHL_RUART tFR_RUART tFF_RUART 200 200 200 200 60 60 45 45 ns ns ns
UART RECEIVER CHARACTERISTICS (CL = 15pF) Receiver (Rx) Propagation Delay Receiver (Rx) Rise/Fall Time ns ns
Note 1: Parameters are 100% production tested at TA =+25C, unless otherwise noted. Limits over temperature are guaranteed by design. Note 2: Guaranteed by design, not production tested.
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5
USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode MAX3349EA
Typical Operating Characteristics
(VBUS = +5V, VL = +3.3V, VUART = +2.75V, TA = +25C, unless otherwise noted.)
SINGLE-ENDED RECEIVER PROPAGATION DELAY vs. VL
MAX3349EA toc01
SINGLE-ENDED RECEIVER PROPAGATION DELAY vs. VBUS
TA = +85C PROPAGATION DELAY (ns) 20
MAX3349EA toc02
LOGIC CURRENT CONSUMPTION IN SUSPEND MODE
MAX3349EA toc03
50
22
5
PROPAGATION DELAY (ns)
40 TA = +85C 30 TA = +25C 20
4
TA = +25C 16 TA = -40C 14
IVL (A)
18
3
2
10 TA = -40C 0 1.4 1.6 1.8 2.0 VL (V) 2.2 2.4 2.6
1
12 4.00 4.25 4.50 4.75 VBUS (V) 5.00 5.25 5.50
0 1.4 1.6 1.8 2.0 2.2 2.4 2.6 VL (V)
VBUS CURRENT CONSUMPTION IN SUSPEND MODE
MAX3349EA toc04
VL CURRENT DURING USB OPERATION vs. D+/D- CAPACITANCE
MAX3349EA toc05
VBUS CURRENT DURING USB OPERATION vs. D+/D- CAPACITANCE
12Mbps DATA RATE TRANSMITTING 16
MAX3349EA toc06
40 39 38 37 IVCC (A)
0.55 12Mbps DATA RATE TRANSMITTING 0.53
20
35 34 33 32 31 30 4.00 4.25 4.50 4.75 VBUS (V) 5.00 5.25 5.50
IVL (mA)
36
0.51
IVBUS (mA) 0 40 80 120 160 200 240
12
0.49
8
0.47
4
0.45 D+/D- CAPACITANCE (CL)
0 0 40 80 120 160 200 240 D+/D- CAPACITANCE (CL)
SUSPEND MODE
MAX3349EA toc07
BUS DETECT RESPONSE
MAX3349EA toc08
SUS 2V/div VBUS 2V/div RCV 2V/div
BD 1V/div
10ns/div
4s/div
6
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USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode
Pin Description
PIN UCSP A1 TQFN 1 TYPE NAME FUNCTION 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 0.1F ceramic capacitor. UART Receive Output. In UART mode, RX is a level-shifted output that expresses the logic state of D+. UART Transmit Input. In UART mode, D- follows the logic state on TX. 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 logiclow. Digital Logic Supply. Connect a +1.4V to +2.75V supply to VL. Bypass VL to GND with a 0.1F or larger ceramic capacitor. 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). 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). Differential Receiver Output. In USB mode, RCV is the output of the USB differential receiver (Table 3). Internal Regulator Output. VTRM provides a regulated +3.3V output. Bypass VTRM to GND with a 1F ceramic capacitor. VTRM draws power from VBUS. Do not power external circuitry from VTRM. 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. Suspend Input. Drive SUS low for normal operation. Drive 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 is in UART mode. USB Supply Voltage. VBUS provides power to the internal linear regulator when in USB mode. Bypass VBUS to GND with a 0.1F 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 Paddle. Connect exposed paddle to GND.
MAX3349EA
POWER
VUART
A2 A3 A4
2 3 4
OUTPUT INPUT OUTPUT
RX TX BD
B1
15
POWER
VL
B2
16
I/O
VM
B3
5
I/O
VP
B4
6
OUTPUT
RCV
C1
14
POWER
VTRM
C2
13
INPUT
ENUM
C3
8
INPUT
SUS
C4
7
INPUT
OE
D1 D2 D3 D4 --
12 11 10 9 EP
POWER I/O I/O POWER --
VBUS D+ DGND EP
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7
USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode MAX3349EA
Timing Diagrams
OE tFR, tFR_TUART VUSB_OHD, VOHD 90% 90% D+/DtFF, tFF_TUART VP/VM CONNECTED TO GND, D+/D- CONNECTED TO PULLUP
10% VUSB_OLD, VOLD
10%
tPLZ_DRV
tPZL_DRV
OE
VP/VM CONNECTED TO VL, D+/D- CONNECTED TO PULLDOWN
Figure 1. Rise and Fall Times
D+/D-
tPHZ_DRV
tPZH_DRV
VM
VP AND VM RISE/FALL TIMES < 4ns
Figure 3. Driver Enable and Disable Timing
+3V VP tPLH_DRV tPHL_DRV 0V D-
INPUT RISE/FALL TIME < 4ns
D+/D-
VCRS_F D+ VL tPLH_RCV, tPLH_SE tPHL_RCV, tPHL_SE
RCV, VM, AND VP
Figure 2. Timing of VP and VM to D+ and D-
Figure 4. D+/D- Timing to VP, VM, and RCV
8
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USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode MAX3349EA
Timing Diagrams (continued)
TEST POINT OE 1. ENABLE TIME (D+/D-) MEASUREMENT CL 50pF 2. VP/VM TO D+/DPROPAGATION DELAY 3. D+/D- RISE/FALL TIMES
MAX3349EA
D+/D15k
D+/D- CONNECTED TO GND, VP/VM CONNECTED TO PULLUP VP/VM
Figure 7. Test Circuit for Enable Time, Transmitter Propagation Delay, and Transmitter Rise/Fall Time
tPLZ_SE tPZL_SE
OE
D+/D- CONNECTED TO +3V, VP/VM CONNECTED TO PULLDOWN
TEST POINT
MAX3349EA
RCV/VP/VM CL 15pF
1. D+/D- TO RCV/VM/VP PROPAGATION DELAYS
VP/VM
Figure 8. Test Circuit for Receiver Propagation Delay
tPHZ_SE
tPZH_SE RC 1M CHARGE-CURRENTLIMIT RESISTOR TEST POINT 220 1. DISABLE TIME (D+/D-) MEASUREMENT V = 0 FOR tPHZ V = VTRM FOR tPLZ HIGHVOLTAGE DC SOURCE RD 1.5k DISCHARGE RESISTANCE DEVICE UNDER TEST
Figure 5. Receiver Enable and Disable Timing
MAX3349EA
D+/DCL 50pF
Cs 100pF
STORAGE CAPACITOR
Figure 6. Test Circuit for Disable Time
Figure 9. Human Body ESD Test Model
Detailed Description
The MAX3349EA 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 MAX3349EA features a separate UART voltage supply
input. 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 resistors on D+ and D-, and an internal 1.5k 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
9
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USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode MAX3349EA
Timing Diagrams (continued)
IP 100% 90% AMPERES 36.8% 10% 0 0 tRL TIME
Ir
PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) IPEAK
I 100% 90%
10% tDL CURRENT WAVEFORM tR = 0.7ns to 1ns 30ns 60ns t
Figure 10. Human Body Model Current Waveform
Figure 12. IEC 61000-4-2 Contact Discharge Model Current Waveform
RC 50M to 100M CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE
RD 330 DISCHARGE RESISTANCE DEVICE UNDER TEST
Cs 150pF
STORAGE CAPACITOR
USB Mode In USB mode, the MAX3349EA 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 singleended 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 MAX3349EA into a low-power operating mode and disable the differential USB receiver (Table 3b). UART Mode The MAX3349EA 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.
Figure 11. IEC61000-4-2 ESD Contact Discharge Test Model
GND with a 0.1F ceramic capacitor as close to the device as possible. There are high-impedance resistors ~2M to ground on D+ and D- to prevent floating nodes when in UART mode and nothing is connected.
Power-Supply Configurations
VL Logic Supply In both USB and UART modes, the control interface is powered from VL. The MAX3349EA operates with logicside voltage (VL) as low as +1.4V, providing level shifting for lower voltage ASICs and microcontrollers.
Operating Modes
The MAX3349EA 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 VTH-VBUS is applied to VBUS, and logic-low otherwise. The MAX3349EA operates in USB mode when BD is logic-high, and UART mode when BD is logic-low.
10
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USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode MAX3349EA
Table 1. Power-Supply Configuration
VBUS(V) +4.0 to +5.5 +4.0 to +5.5 GND or Unconnected VTRM(V) +3.0 to +3.6 Output +3.0 to +3.6 Output High Impedance VL(V) +1.4 to +2.75 GND or Unconnected +1.4 to +2.75 VUART(V) GND, Unconnected, or +2.7V to +3.3V GND, Unconnected, or +2.7V to +3.3V +2.7V to +3.3V CONFIGURATION USB Mode Disable Mode UART Mode
Table 2. USB Transmit Truth Table (OE = 0)
INPUTS VP 0 0 1 1 VM 0 1 0 1 D+ 0 0 1 1 OUTPUTS D0 1 0 1
Table 3b. USB Receive Truth Table (OE = 1, SUS = 1)
INPUTS D+ 0 0 1 1 D0 1 0 1 VP 0 0 1 1 OUTPUTS VM 0 1 0 1 RCV 0 0 0 0
Table 3a. USB Receive Truth Table (OE = 1, SUS = 0)
INPUTS D+ 0 0 1 1 D0 1 0 1 VP 0 0 1 1 OUTPUTS VM 0 1 0 1 RCV RCV* 0 1 X
UART Mode Connect VL and VUART to system power supplies, and leave VBUS unconnected or below VTH-BUS to operate the MAX3349EA in UART mode. The MAX3349EA 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 1.5k pullup resistor from D+ to VTRM. Drive ENUM logic-low to disable the internal pullup resistor and logically disconnect the MAX3349EA from the USB. SUS Operate the MAX3349EA 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 38A (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 remains enabled in suspend mode to allow transmission of a remote wake-up on D+ and D-.
11
* = Last state. X = Undefined.
USB Mode The MAX3349EA 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 MAX3349EA 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 1F 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.
______________________________________________________________________________________
USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode
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 V L. 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 MAX3349EA is connected to a powered USB. BD is logic-low when VBUS is unconnected. 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 61000-4-2 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.
MAX3349EA
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 MAX3349EA in USB mode (see the Operating Modes section), and drive OE low. The MAX3349EA 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 MAX3349EA 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-.
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 MAX3349EA 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 1.5k resistor. Figure 10 shows the current waveform when the storage capacitor is discharged into a low impedance.
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.
Power-Supply Decoupling
Bypass V BUS , V L, and V UART to ground with 0.1F ceramic capacitors. Additionally, bypass V TRM to ground with a 1F ceramic capacitor. Place all bypass capacitors as close as possible to the device .
12
______________________________________________________________________________________
USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode MAX3349EA
Timing Diagrams
TX
50% tPLH_TUART
50%
D+
50% tPLH_RUART
50%
tPHL_TUART 90% D50% 10% 90% 50% 10% tFR_TUART RX 50% 10% 90% 90%
tPHL_RUART
50% 10% tFR_RUART
tFF_TUART
tFF_RUART
Figure 13. UART Transmitter Timing
Figure 14. UART Receiver Timing
Power Sequencing
There are no power-sequencing requirements for V L, VUART, and VBUS.
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 ChipScale Package available on Maxim's website at www.maxim-ic.com/ucsp.
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13
USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode MAX3349EA
Typical Operating Circuit
VL 0.1F VUART 0.1F
VP USB SERIALINTERFACE ENGINE (SIE) ASIC RX UART TX VBUS 0.1F ENUM SUS MICROCONTROLLER BD D+ / RX D- / TX USB/UART CONNECTOR VM OE RCV VTRM 1F
MAX3349EA
Chip Information
PROCESS: BiCMOS
14
______________________________________________________________________________________
USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode
Functional Diagram
VL VUART VTRM
MAX3349EA
LEVEL SHIFTING
3.3V LINEAR REGULATOR
VBUS
ENUM BD VTH_VBUS
RX
UART Rx
1.5k
TX
UART Tx
VP USB DIFFERENTIAL TRANSMITTER VM
38 38
D+ D-
D+ RECEIVER OE DRECEIVER
SUS
RCV
USB RECEIVER
GND
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15
USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode MAX3349EA
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
16L,UCSP.EPS
PACKAGE OUTLINE, 4x4 UCSP 21-0101 H
1 1
16
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USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
24L QFN THIN.EPS
MAX3349EA
PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm
21-0139
E
1
2
PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm
21-0139
E
2
2
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 (c) 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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