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19-2843; Rev 2; 10/08
15kV ESD-Protected USB Transceivers
General Description
The MAX3450E/MAX3451E/MAX3452E USB-compliant transceivers interface low-voltage ASICs with USB devices. The devices fully comply with USB 1.1 and USB 2.0 when operating at full (12Mbps) and low (1.5Mbps) speeds. The MAX3450E/MAX3451E/ MAX3452E operate with VL as low as +1.65V, ensuring compatibility with low-voltage ASICs. The MAX3450E/MAX3451E/MAX3452E feature a logicselectable suspend mode that reduces current consumption to less than 40A. Integrated 15kV ESD protection protects the USB D+ and D- bidirectional bus connections. The MAX3450E is pin compatible with Micrel's MIC2550A. The MAX3451E features an internal 1.5k USB pullup resistor and an enumeration function that allows devices to logically disconnect while plugged in. The MAX3452E provides a push-pull busdetect (BD) output that asserts high when V BUS is greater than +4.0V. The MAX3450E/MAX3451E/MAX3452E operate over the -40C to +85C extended temperature range and are available in 14-pin TSSOP and 3mm x 3mm 16-pin Thin QFN packages. 15kV ESD Protection on D+ and D Combined VP and VM Inputs/Outputs +1.65V to +3.6V VL Logic Supply Input for Interfacing with Low-Voltage ASICs Enumerate Input Function (MAX3451E) Powered from Li+ Battery as Low as +3.1V (MAX3450E and MAX3451E) VBUS Detection (MAX3452E) Pin Compatible with Micrel MIC2550A (MAX3450E) Internal D+ or D- Pullup Resistor (MAX3451E) No Power-Supply Sequencing Required
Features
MAX3450E/MAX3451E/MAX3452E
Ordering Information
PART MAX3450EEUD+ MAX3450EETE+ MAX3451EEUD+ MAX3451EETE+ MAX3452EEUD+ MAX3452EETE+ PIN-PACKAGE 14 TSSOP 16 Thin QFN-EP 14 TSSOP 16 Thin QFN-EP 14 TSSOP 16 Thin QFN-EP TOP MARK -- AAJ -- AAK -- AAL
Applications
PDAs PC Peripherals Cellular Telephones Data Cradles MP3 Players
Typical Operating Circuit appears at end of data sheet.
Note: All devices are specified over the -40C to +85C operating temperature range. +Denotes lead(Pb)-free package/RoHS-compliant package. EP = Exposed pad.
Pin Configurations
VBUS 14 N.C.
TOP VIEW
VL 1 SPD 2 RCV 3 VP 4 VM 5 N.C. 6 GND 7
+
14 VBUS 13 N.C. *(ENUM) **(BD) 12 VTRM RCV 2 3 SPD 1
+
16
15
13
MAX3450E MAX3451E MAX3452E
11 D+ 10 D9 OE 8 SUS VP VM
MAX3450E MAX3451E MAX3452E
***EXPOSED PAD
N.C. *(ENUM) **(BD) 12 VTRM 11 D+ 10 D9 OE 8 N.C.
4 5 N.C. 6 GND 7 SUS
TSSOP
*MAX3451E ONLY **MAX3452E ONLY ***CONNECT EXPOSED PADDLE TO GND OR LEAVE UNCONNECTED
3mm x 3mm THIN QFN-EP
________________________________________________________________ Maxim Integrated Products
VL
1
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.
15kV ESD-Protected USB Transceivers MAX3450E/MAX3451E/MAX3452E
ABSOLUTE MAXIMUM RATINGS
VBUS, VL, D+, D- to GND.......................................-0.3V to +6.0V VTRM to GND ............................................-0.3V to (VBUS + 0.3V) VP, VM, SUS, SPD, ENUM, RCV, OE, BD to GND ................................-0.3V to (VL + 0.3V) Current (into any pin)........................................................15mA Short-Circuit Current (D+ and D-) ..................................150mA Continuous Power Dissipation (TA = +70C) 14-Pin TSSOP (derate 10mW/C above +70C) ..................................797mW 16-Pin Thin QFN-EP 3mm x 3mm (derate 20.8mW/C above +70C) .............................1667mW Package Junction-to-Ambient Thermal Resistance (JA) (Note 1) 14-Pin TSSOP..........................................................100.4C/W 16-Pin Thin QFN-EP .....................................................48C/W Package Junction-to-Case Thermal Resistance (JC) (Note 1) 14-Pin TSSOP...............................................................30C/W 16-Pin Thin QFN-EP .......................................................7C/W Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specifications. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
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.
DC ELECTRICAL CHARACTERISTICS
(VBUS = +4.0V to +5.5V or VTRM = +3.0V to +3.6V, VL = +1.65V to +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VBUS = +5.0V, VL = +2.5V, and TA = +25C.) (Note 2)
PARAMETER Regulated Supply Voltage Output Operating Supply Current Operating VL Supply Current Full-Speed Idle and SE0 Supply Current Static VL Supply Current SYMBOL CONDITIONS MIN TYP MAX UNITS
SUPPLY INPUTS (VBUS, VTRM, VL) VTRM IVBUS IVL IVBUS(IDLE) Internal regulator Full-speed transmitting/receiving at 12Mbps, CL = 50pF on D+ and D- (Note 3) Full-speed transmitting/receiving at 12Mbps (Note 3) Full-speed idle: VD+ > 2.7V, VD- < 0.3V SE0: VD+ < 0.3V, VD- < 0.3V Full-speed idle, SE0, or suspend mode MAX3450E, MAX3451E MAX3452E MAX3450E, MAX3451E (ENUM = low) MAX3452E Disable-Mode Supply Current Sharing-Mode VL Supply Current IVBUS(DIS) VL = GND or open MAX3450E, MAX3451E MAX3452E 250 250 3.0 3.3 3.6 10 2.5 350 350 5 15 35 40 20 5 A 20 20 5 A A A V mA mA A
IVL(STATIC)
A
Suspend Supply Current
IVBUS(SUSP)
VM = VP = open, SUS = OE = high
A
VBUS = GND or open, OE = low, VP = low or IVL(SHARING) high, VM = low or high, SUS = high
D+/D- Sharing-Mode Load Current D+/D- Disable-Mode Load Current
ID_(SHARING) VBUS = GND or open, VD_ = 0 or +5.5V ID_(DIS) VL = GND or open, VD_ = 0 or +5.5V
2
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15kV ESD-Protected USB Transceivers
DC ELECTRICAL CHARACTERISTICS (continued)
(VBUS = +4.0V to +5.5V or VTRM = +3.0V to +3.6V, VL = +1.65V to +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VBUS = +5.0V, VL = +2.5V, and TA = +25C.) (Note 1)
PARAMETER USB Power-Supply Detection Threshold SYMBOL CONDITIONS MAX3450E/MAX3451E, supply lost VTH_VBUS MAX3450E/MAX3451E, supply present (Note 4) MAX3452E, supply lost MAX3452E, supply present USB Power-Supply Detection Hysteresis VL Power-Supply Detection Threshold Input Voltage Low Input Voltage High Output Voltage Low Output Voltage High Input Leakage Current Input Capacitance ANALOG INPUTS/OUTPUTS (D+, D-) Differential Input Sensitivity Differential Common-Mode Voltage Single-Ended Input Low Voltage Single-Ended Input High Voltage Hysteresis Output Voltage Low Output Voltage High Off-State Leakage Current Transceiver Capacitance Driver Output Impedance Input Impedance Internal Pullup Resistance ESD PROTECTION (D+, D-) Human Body Model IEC 1000-4-2 Contact Discharge 15 8 kV kV VID VCM VILSE VIHSE VHYST VOLD VOHD ILZ CIND ZDRV ZIN RPULLUP Measured from D_ to GND Steady-state drive Driver off ILOAD = 500A (MAX3451E) (Note 5) 4.0 10 1.425 1.575 RL = 1.5k to +3.6V RL = 15k to GND 2.8 -1 20 15.5 2.0 250 0.3 3.6 +1 |VD+ - VD-| Includes VID range 0.2 0.8 2.5 0.8 V V V V mV V V A pF
MAX3450E/MAX3451E/MAX3452E
MIN 3.6
TYP
MAX 0.8 3.6
UNITS
V
4.0 75 40 0.85 mV V
VHYST_VBUS VTH_VL
MAX3450E/MAX3451E MAX3452E
DIGITAL INPUTS/OUTPUTS (VP, VM, RCV, SUS, OE, SPD, BD, ENUM) VIL VIH VOL VOH ILKG CIN Measured from input to GND VM, VP, SUS, SPD, ENUM, OE VM, VP, SUS, SPD, ENUM, OE VM, VP, RCV, BD, IOL = +2mA VM, VP, RCV, BD, IOH = -2mA VL - 0.4 -1 10 +1 0.7 x VL 0.4 0.3 x VL V V V V A pF
M k
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15kV ESD-Protected USB Transceivers MAX3450E/MAX3451E/MAX3452E
TIMING CHARACTERISTICS
(VBUS = +4.0V to +5.5V or VTRM = +3.0V to +3.6V, VL = +1.65V to +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VBUS = +5V, VL = +2.5V, and TA = +25C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DRIVER CHARACTERISTICS (FULL-SPEED MODE, CL = 50pF) Rise Time Fall Time Rise-/Fall-Time Matching (Note 3) Output-Signal Crossover Voltage (Note 3) Driver Propagation Delay (Figures 2, 6) Driver Disable Delay (Figure 3) Driver Enable Delay (Figure 3) Rise Time Fall Time Rise-/Fall-Time Matching Output-Signal Crossover Voltage tFR tFF tFR/tFF VCRS_F tPLH_DRV tPHL_DRV tPHZ_DRV tPLZ_DRV tPZH_DRV tPZL_DRV tLR tLF tLR/tLF VCRS_L 10% to 90% of |VOHD - VOLD|, Figures 1, 6 90% to 10% of |VOHD - VOLD|, Figures 1, 6 Excluding the first transition from idle state, (Figures 1, 6) Excluding the first transition from idle state, (Figures 2, 6) Low-to-high transition High-to-low transition High-to-off transition Low-to-off transition Off-to-high transition Off-to-low transition 10% to 90% of |VOHD - VOLD|, Figures 1, 6 90% to 10% of |VOHD - VOLD|, Figures 1, 6 Excluding the first transition from idle state, Figures 1, 6 Excluding the first transition from idle state, Figures 2, 6 Low-to-high transition High-to-low transition Low-to-high transition High-to-low transition High-to-off transition Low-to-off transition Off-to-high transition Off-to-low transition 75 75 80 1.3 4 4 90 1.3 20 20 110 2.0 18 18 20 20 20 20 300 300 125 2.0 ns ns % V ns ns ns
DRIVER CHARACTERISTICS (LOW-SPEED MODE, CL = 200pF TO 600pF) ns ns % V
RECEIVER CHARACTERISTICS (CL = 15pF) Differential Receiver Propagation Delay, Figures 4, 6 Single-Ended Receiver Propagation Delay, Figures 4, 6 Single-Ended Receiver Disable Delay, Figure 5 Single-Ended Receiver Enable Delay, Figure 5 tPLH_RCV tPHL_RCV tPLH_SE tPHL_SE tPHZ_SE tPLZ_SE tPZH_SE tPZL_SE 22 22 12 12 15 15 15 15 ns ns ns ns
Note 2: Parameters are 100% production tested at +25C, unless otherwise noted. Limits over temperature are guaranteed by design. Note 3: Guaranteed by design, not production tested. Note 4: Production tested to +2.7V for VL +3.0V. Note 5: Including external 24.3 series resistor.
4
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15kV ESD-Protected USB Transceivers
Typical Operating Characteristics
(VBUS = +5.0V, VL = +3.3V, TA = +25C, unless otherwise noted.)
MAX3450E/MAX3451E/MAX3452E
SINGLE-ENDED RECEIVER PROPAGATION DELAY vs. VL
CL = 15pF 7 PROPAGATION DELAY (ns) 6 5 4 3 2 1 0 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 VL (V) TA = -40C TA = +25C TA = +85C
MAX3450-52E toc01
RISE-/FALL-TIME MATCHING (FULL SPEED)
MAX3450-52E toc02
RISE-/FALL-TIME MATCHING (LOW SPEED)
MAX3450-52E toc03
8
CL = 50pF
CL = 400pF
D+/D1V/div
D+/D1V/div
20ns/div
100ns/div
OE, VP, AND VM TIMING
MAX3450-52E toc04
SUPPLY CURRENT vs. D+/D- CAPACITANCE
24 22 20 18 16 14 12 10 8 6 4 2 0 0 50 100 150 200 250 300 350 400 D+/D- CAPACITANCE (pF)
MAX3450-52E toc05
LOGIC SUPPLY CURRENT vs. D+/D- CAPACITANCE
450 LOGIC SUPPLY CURRENT (A) 400 350 300 250 200 150 100 50 0 0 50 100 150 200 250 300 350 400 D+/D- CAPACITANCE (pF) SPD = GND, fIN = 750kHz SPD = VL, fIN = 6MHz
MAX3450-52E toc06
500
CL = 15pF VP 2V/div VM 2V/div
SUPPLY CURRENT (mA)
SPD = VL, fIN = 6MHz SPD = GND, fIN = 750kHz
OE 5V/div
20ns/div
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15kV ESD-Protected USB Transceivers MAX3450E/MAX3451E/MAX3452E
Pin Description
PIN TSSOP 1 2 3 4 5 6 7 8 THIN QFN-EP 15 1 2 3 4 5, 8, 16 6 7 NAME FUNCTION Digital I/O Connections Logic Supply. Connect a +1.65V to +3.6V supply to VL. Bypass VL to GND with a 0.1F ceramic capacitor. Speed-Selector Input. Connect SPD to GND to select the low-speed data rate (1.5Mbps). Connect SPD to VL to select the full-speed data rate (12Mbps). Differential-Receiver Output. RCV responds to the differential input on D+ and D- (Tables 3 and 4). RCV asserts low if SUS = VL. Receiver Output/Driver Input. VP functions as a receiver output when OE = VL. VP duplicates D+ when receiving. VP functions as a driver input when OE = GND. Receiver Output/Driver Input. VM functions as a receiver output when OE = VL. VM duplicates Dwhen receiving. VM functions as a driver input when OE = GND. No Connection. Not internally connected. Ground Suspend Input. Drive SUS low for normal operation. Drive SUS high to put the MAX3450E/ MAX3451E/MAX3452E into suspend mode. RCV asserts low in suspend mode. VP and VM remain active in suspend mode. Output Enable. Drive OE to GND to enable the transmitter outputs. Drive OE to VL to disable the transmitter outputs. OE also controls the I/O direction of VP and VM (Tables 3 and 4). USB Input/Output. For OE = GND, D- functions as a USB output, with VM providing the input signal. For OE = VL, D- functions as a USB input, with VM functioning as a single-ended receiver output. Connect a 1.5k resistor from D- to VTRM for low-speed (1.5Mbps) operation (MAX3450E and MAX3452E). USB Input/Output. For OE = GND, D+ functions as a USB output, with VP providing the input signal. For OE = VL, D+ functions as a USB input, with VP functioning as a single-ended receiver output. Connect a 1.5k resistor from D+ to VTRM for full-speed (12Mbps) operation (MAX3450E and MAX3452E). Internal Regulator Output. VTRM provides a regulated +3.3V output. Bypass VTRM to GND with a 1F (min) ceramic capacitor as close to the device as possible. VTRM normally derives power from VBUS. Alternatively, drive VTRM directly with a +3.3V 10% supply (MAX3450E and MAX3451E). VTRM provides power to internal circuitry and provides the pullup voltage for an external USB pullup resistor (MAX3450E and MAX3452E). Do not use VTRM to power external circuitry. No Connection. Not internally connected (MAX3450E). Enumerate Function Selection Input (MAX3451E). Drive ENUM to VL to connect the internal 1.5k resistor between VTRM and D+ or D-, depending on the SPD state. Drive ENUM to GND to disconnect the internal 1.5k resistor. For SPD = VL, the 1.5k pullup resistor connects to D+. For SPD = GND, the 1.5k pullup resistor connects to D-. Bus-Detection Output (MAX3452E). The push-pull BD output asserts low and the device enters sharing mode if VBUS < +3.6V. BD asserts high if VBUS > +4.0V. USB Power-Supply Input. Connect a +4.0V to +5.5V power supply to VBUS. VBUS provides power to the internal linear regulator. Bypass VBUS to GND with a 0.1F ceramic capacitor as close to the device as possible. Connect VBUS and VTRM together when powering the MAX3450E or MAX3451E with an external power supply (+3.3V 10%). Exposed Pad. Connect exposed pad to ground.
VL SPD RCV VP VM N.C. GND SUS
9
9
OE
10
10
D-
11
11
D+
12
12
VTRM
N.C.
13
13
ENUM
BD
14
14
VBUS
--
--
EP
6
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15kV ESD-Protected USB Transceivers
Functional Diagram
MAX3450E/MAX3451E/MAX3452E
MAX3450E MAX3451E MAX3452E
TO INTERNAL CIRCUITRY BD MAX3452E ONLY VL VTH_VBUS LDO REGULATOR VBUS
VTRM
SPD VP VM D+ D-
OE
LEVEL TRANSLATOR
RCV
SUS
TO INTERNAL CIRCUITRY
VTRM
MAX3451E ONLY
SPD ENUM GND
CONTROL LOGIC
Detailed Description
The MAX3450E/MAX3451E/MAX3452E USB-compliant transceivers convert single-ended or differential logic-level signals to USB signals and USB signals to single-ended or differential logic-level signals. The devices fully comply with USB 1.1, as well as USB 2.0 at full- (12Mbps) and low-speed (1.5Mbps) operation. The MAX3450E/MAX3451E/MAX3452E operate with VL
as low as +1.65V, ensuring compatibility with low-voltage ASICs. The MAX3450E/MAX3451E/MAX3452E derive power from the USB host (VBUS) or from a single-cell Li+ battery (MAX3450E and MAX3451E) connected to VBUS or from a +3.3V regulated supply connected to VBUS and VTRM. The MAX3450E/MAX3451E/MAX3452E meet the physical-layer specifications for logic-level supply volt-
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15kV ESD-Protected USB Transceivers MAX3450E/MAX3451E/MAX3452E
ages (VL) from +1.65V to +3.6V. Integrated 15kV ESD protection protects the D+ and D- USB I/O ports. The MAX3451E features an enumerate function providing an internal 1.5k pullup resistor to VTRM. The enumerate function disconnects the 1.5k pullup resistor, allowing the MAX3451E to simulate a bus disconnect while powered and connected to the USB cable. The MAX3450E is pin-for-pin compatible with Micrel's MIC2550A. The MAX3452E features a BD output that asserts high if VBUS is greater than +4.0V. BD asserts low if V BUS is less than +3.6V. The MAX3450E and MAX3452E require external pullup resistors from either D+ or D- to VTRM to set the bus speed. a single Li+ battery. Connect the battery to VBUS. VTRM remains above +3.0V for VBUS as low as +3.1V. Additionally, the MAX3450E and MAX3451E can derive power from a +3.3V 10% voltage regulator. Connect VBUS and VTRM to an external +3.3V voltage regulator. VBUS no longer consumes current to power the internal linear regulator in this configuration.
Applications Information
Power-Supply Configurations
Normal Operating Mode Connect V L and V BUS to system power supplies (Table 1). Connect VL to a +1.65V to +3.6V supply. Connect VBUS to a +4.0V to +5.5V supply. Alternatively, the MAX3450E and MAX3451E can derive power from
Disable Mode Connect VBUS to a system power supply and leave VL unconnected or connect to GND. D+ and D- enter a tristate mode and VBUS (or VBUS and VTRM) consumes less than 20A of supply current. D+ and D- withstand external signals up to +5.5V in disable mode (Table 2). Sharing Mode Connect VL to a system power supply and leave VBUS (or VBUS and VTRM) unconnected or connect to GND. D+ and D- enter a tri-state mode, allowing other circuitry to share the USB D+ and D- lines, and VL consumes less than 20A of supply current. D+ and D- withstand external signals up to +5.5V in sharing mode (Table 2).
Table 1. Power-Supply Configurations
VBUS (V) +4.0 to +5.5 +3.1 to +4.5 +3.0 to +3.6 GND or floating +3.0 to +5.5 VTRM (V) +3.0 to +3.6 output +3.0 to +3.6 output +3.0 to +3.6 input Output VBUS VL (V) +1.65 to +3.6 +1.65 to +3.6 +1.65 to +3.6 +1.65 to +3.6 GND or floating CONFIGURATION Normal mode Battery supply Voltage regulator supply Sharing mode Disable mode NOTES -- MAX3450E, MAX3451E MAX3450E, MAX3451E Table 2 Table 2
Table 2. Disable-Mode and Sharing-Mode Connections
INPUTS/OUTPUTS VBUS/VTRM VL D+ and DVP and VM RCV SPD, SUS, OE, ENUM (MAX3451E) BD (MAX3452E) DISABLE MODE * +5V input/+3.3V output * +3.3V input/+3.3V input (MAX3450E and MAX3451E) * +3.7V input/+3.3V output (MAX3450E and MAX3451E) Floating or connected to GND High impedance Invalid* Invalid* High impedance Invalid* SHARING MODE * Floating or connected to GND (MAX3450E and MAX3451) * < +3.6V (MAX3452E) +1.65V to +3.6V input High impedance High impedance for OE = low High for OE = high Undefined** High impedance Low
*High impedance or low **High or low 8 _______________________________________________________________________________________
15kV ESD-Protected USB Transceivers
Device Control
OE OE controls the direction of communication. Drive OE low to transfer data from the logic side to the USB side. For OE = low, VP and VM serve as differential driver inputs to the USB transmitter. Drive OE high to transfer data from the USB side to the logic side. For OE = high, VP and VM serve as singleended receiver outputs from the USB inputs (D+ and D-). RCV serves as a differential receiver output, regardless of the state of OE. ENUM (MAX3451E) The MAX3451E features an enumerate function that allows software control of USB enumeration. USB protocol requires a 1.5k pullup resistor to D+ or D- to indicate the transmission speed to the host (see the SPD section). The MAX3451E provides an internal 1.5k pullup resistor. Remove the pullup resistor from the circuit to simulate a device disconnect from the USB. Drive ENUM low to disconnect the internal pullup resistor. Drive ENUM high to connect the internal pullup resistor. The SPD state determines whether the pullup resistor connects to D+ or D-. For ENUM = high, the internal 1.5k pullup resistor connects to D+ when SPD = VL (full speed) or to D- when SPD = GND (low speed). SPD SPD sets the transceiver speed. Connect SPD to GND to select the low-speed data rate (1.5Mbps). Connect SPD to VL to select the full-speed data rate (12Mbps). The MAX3451E provides an internal pullup resistor for selecting the bus speed. The MAX3450E and MAX3452E require an external pullup resistor to D+ or D- to set the bus speed. Connect the 1.5k resistor between D+ and VTRM to set the full-speed (12Mbps) data rate, or connect the 1.5k resistor between D- and VTRM to set the low-speed (1.5 Mbps) data rate. SUS The SUS state determines whether the MAX3450E/ MAX3451E/MAX3452E operate in normal mode or in suspend mode. Connect SUS to GND to enable normal operation. Drive SUS high to enable suspend mode. RCV asserts low and VP and VM remain active in suspend mode (Tables 3 and 4). Supply current decreases in suspend mode (see the Electrical Characteristics).
MAX3450E/MAX3451E/MAX3452E
Table 3a. Transmit Truth Table (OE = 0, SUS = 0)
INPUTS VP 0 0 1 1 VM 0 1 0 1 D+ 0 0 1 1 OUTPUTS D0 1 0 1 RCV X 0 1 X OUTPUT STATE SE0 Logic 0 Logic 1 Undefined
X = Undefined.
Table 3b. Transmit Truth Table (OE = 0, SUS = 1)
INPUTS VP 0 0 1 1 VM 0 1 0 1 D+ 0 0 1 1 OUTPUTS D0 1 0 1 RCV 0 0 0 0 OUTPUT STATE SE0 Logic 0 Logic 1 Undefined
Table 4a. Receive Truth Table (OE = 1 and SUS = 0)
INPUTS D+ 0 0 1 1 D0 1 0 1 VP 0 0 1 1 OUTPUTS VM 0 1 0 1 RCV X 0 1 X OUTPUT STATE SE0 Logic 0 Logic 1 Undefined
tFR, tLR VOHD 90% 90%
tFF, tLF
X = Undefined.
10% VOLD
10%
Figure 1. Rise and Fall Times
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15kV ESD-Protected USB Transceivers MAX3450E/MAX3451E/MAX3452E
Table 4b. Receive Truth Table (OE = 1 and 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 OUTPUT STATE SE0 Logic 0 Logic 1 Undefined
DVP tPLH_DRV tPHL_DRV
VM
VP AND VM RISE/FALL TIMES < 4ns
BD (MAX3452E) The push-pull bus detect (BD) output monitors VBUS and asserts high if V BUS is greater than +4.0V. BD asserts low if V BUS is less than +3.6V and the MAX3452E enters sharing mode (Table 2). VTRM An internal linear regulator generates the VTRM voltage (+3.3V typ). VTRM derives power from VBUS (see the Power-Supply Configurations section). VTRM powers the internal portions of the USB circuitry and provides the pullup voltage for an external USB pullup resistor MAX3450E/MAX3452E. Bypass VTRM to GND with a 1F ceramic capacitor as close to the device as possible. Do not use VTRM to provide power to external circuitry. D+ and DD+ and D- serve as bidirectional bus connections and are ESD protected to 15kV (Human Body Model). For OE = low, D+ and D- serve as transmitter outputs. For OE = high, D+ and D- serve as receiver inputs. VBUS For most applications, VBUS connects to the VBUS terminal on the USB connector. VBUS can also connect to an external supply as low as +3.1V (MAX3450E and MAX3451E). See the Power-Supply Configurations section. Drive VBUS low to enable sharing mode. Bypass VBUS to GND with a 0.1F ceramic capacitor as close to the device as possible.
VCRS_F , VCRS_L D+
Figure 2. Timing of VP and VM to D+ and D-
The MAX3450E/MAX3452E requires an external 1.5k pullup resistor between VTRM and D+ or D- to set the bus speed.
External Capacitors The MAX3450E/MAX3451E/MAX3452E require three external capacitors for proper operation. Bypass VL to GND with a 0.1F ceramic capacitor. Bypass VBUS to GND with a 0.1F ceramic capacitor. Bypass VTRM to GND with a 1F (min) ceramic capacitor. Install all capacitors as close to the device as possible.
Data Transfer
Transmitting Data to the USB The MAX3450E/MAX3451E/MAX3452E transmit data to the USB differentially on D+ and D-. VP and VM serve as differential input signals to the driver (Tables 3a and 3b). Receiving Data from the USB To receive data from the USB, drive OE high and SUS low. Differential data received by D+ and D- appears as a differential logic signal at RCV. Single-ended receivers on D+ and D- drive VP and VM, respectively (Tables 4a and 4b).
External Components
External Resistors Proper USB operation requires two external resistors, each 24.3 1%, 1/8W (or greater). Install one resistor in series between D+ of the MAX3450E/MAX3451E/ MAX3452E and D+ on the USB connector. Install the other resistor in series between D- of the MAX3450E/ MAX3451E/MAX3452E and D- on the USB connector (see the Typical Operating Circuit).
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15kV ESD-Protected USB Transceivers MAX3450E/MAX3451E/MAX3452E
VL
+3V 560 VL DUT VP/VM D+/D560 150 150
+3V DUT VP/VM D+/D-
OE
OE VP/VM CONNECTED TO GND, D+/D- CONNECTED TO PULLUP
D+/D- CONNECTED TO GND, VP/VM CONNECTED TO PULLUP VP/VM
D+/D-
tPLZ_DRV
tPZL_DRV
tPLZ_SE
tPZL_SE
OE
VP/VM CONNECTED TO VL, D+/D- CONNECTED TO PULLDOWN
OE
D+/D- CONNECTED TO +3V, VP/VM CONNECTED TO PULLDOWN
D+/D-
VP/VM
tPHZ_DRV
tPZH_DRV
tPHZ_SE
tPZH_SE
Figure 3. Enable and Disable Timing, Driver
Figure 5. Enable and Disable Timing, Receiver
+3V
INPUT RISE/FALL TIME < 4ns
D+ / D0
MAX3450E MAX3451E MAX3452E
TEST POINT RCV, VM, AND VP
CL
(a) LOAD FOR RCV, VM, AND VP
VL tPLH_RCV, tPLH_SE tPHL_RCV, tPHL_SE
MAX3450E MAX3451E MAX3452E
24 D+ AND D-
TEST POINT
CL 15k (b) LOAD FOR D+/DRCV, VM, AND VP
Figure 4. Timing of D+ and D- to RCV, VM, and VP
Figure 6. Test Circuits
11
______________________________________________________________________________________
15kV ESD-Protected USB Transceivers MAX3450E/MAX3451E/MAX3452E
ESD Protection
D+ and D- possess extra protection against static electricity to protect the devices up to 15kV. The ESD structures withstand high ESD in all operating modes: normal operation, suspend mode, and powered down. D+ and D- provide protection to the following limits: * 15kV using the Human Body Model * 8kV using the Contact Discharge method specified in IEC 1000-4-2
RC 1M CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE RD 1.5k DISCHARGE RESISTANCE DEVICE UNDER TEST
Cs 100pF
STORAGE CAPACITOR
ESD Test Conditions
ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results.
Figure 7. Human Body ESD Test Models
Human Body Model
Figure 7 shows the Human Body Model and Figure 8 shows the current waveform generated when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which then discharges into the test device through a 1.5k resistor.
IP 100% 90% AMPERES 36.8% Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
IEC 1000-4-2
The IEC 1000-4-2 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 1000-4-2 is a higher peak current in IEC 1000-4-2, due to lower series resistance. Hence, the ESD withstand voltage measured to IEC 1000-4-2 generally is lower than that measured using the Human Body Model. Figure 9 shows the IEC 1000-4-2 model. The Contact Discharge method connects the probe to the device before the probe is charged.
10% 0 0 tRL TIME tDL CURRENT WAVEFORM
Figure 8. Human Body Model Current Waveform
RC 50 to 100 CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE
RD 330 DISCHARGE RESISTANCE DEVICE UNDER TEST
Machine Model
The Machine Model for ESD tests all connections using a 200pF storage capacitor and zero discharge resistance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. All pins require this protection during manufacturing, not just inputs and outputs. After PC board assembly, the Machine Model is less relevant to I/O ports.
Cs 150pF
STORAGE CAPACITOR
Figure 9. IEC 1000-4-2 ESD Test Model
12
______________________________________________________________________________________
15kV ESD-Protected USB Transceivers
Typical Operating Circuit
+1.65V TO +3.6V 0.1F VL VL(I/O) VP VM RCV ENUM SUS SPD OE VTRM 1F 0.1F VBUS D24.3 1%
MAX3450/MAX3451E/MAX3452E
PC USB POWER DD+ GND 15k 15k
24.3 1%
MAX3451E
D+ GND
ASIC
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 14 TSSOP 16 Thin QFN-EP PACKAGE CODE U14-1 T1633-4 DOCUMENT NO. 21-0066 21-0136
______________________________________________________________________________________
13
15kV ESD-Protected USB Transceivers MAX3450/MAX3451E/MAX3452E
Revision History
REVISION NUMBER 0 1 2 REVISION DATE 4/03 11/03 10/08 Initial release Changed specs Added lead-free packaging. Updated Absolute Maximum Ratings information of package thermal resistances. Updated EC table notation. DESCRIPTION PAGES CHANGED 1-4, 6
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.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

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