19-2843; Rev 2; 10/08 ±15kV ESD-Protected USB Transceivers 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 40µA. 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 1.5kΩ 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 -40°C to +85°C extended temperature range and are available in 14-pin TSSOP and 3mm x 3mm 16-pin Thin QFN packages. Applications PDAs PC Peripherals Features ♦ ±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 Ordering Information PART PIN-PACKAGE MAX3450EEUD+ 14 TSSOP MAX3450EETE+ 16 Thin QFN-EP† — MAX3451EEUD+ 14 TSSOP MAX3451EETE+ 16 Thin QFN-EP† MAX3452EEUD+ 14 TSSOP MAX3452EETE+ Cellular Telephones 16 Thin TOP MARK AAJ — AAK — QFN-EP† AAL Note: All devices are specified over the -40°C to +85°C operating temperature range. +Denotes lead(Pb)-free package/RoHS-compliant package. †EP = Exposed pad. Data Cradles MP3 Players Typical Operating Circuit appears at end of data sheet. RCV 3 12 VTRM VP 4 VM 5 MAX3450E MAX3451E MAX3452E SPD 1 RCV 2 VP 3 N.C. *(ENUM) **(BD) 15 14 13 12 VTRM MAX3450E MAX3451E MAX3452E 11 D+ 10 D- N.C. 6 9 OE GND 7 8 SUS TSSOP *MAX3451E ONLY **MAX3452E ONLY ***CONNECT EXPOSED PADDLE TO GND OR LEAVE UNCONNECTED 11 D+ 10 D- ***EXPOSED PAD VM 4 9 5 6 7 8 N.C. 13 N.C. *(ENUM) **(BD) 16 SUS SPD 2 + VBUS 14 VBUS GND + N.C. VL 1 VL TOP VIEW N.C. Pin Configurations OE 3mm x 3mm THIN QFN-EP ________________________________________________________________ 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 MAX3450E/MAX3451E/MAX3452E General Description MAX3450E/MAX3451E/MAX3452E ±15kV ESD-Protected USB Transceivers 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 = +70°C) 14-Pin TSSOP (derate 10mW/°C above +70°C) ..................................797mW 16-Pin Thin QFN-EP 3mm x 3mm (derate 20.8mW/°C above +70°C) .............................1667mW Package Junction-to-Ambient Thermal Resistance (θJA) (Note 1) 14-Pin TSSOP..........................................................100.4°C/W 16-Pin Thin QFN-EP .....................................................48°C/W Package Junction-to-Case Thermal Resistance (θJC) (Note 1) 14-Pin TSSOP...............................................................30°C/W 16-Pin Thin QFN-EP .......................................................7°C/W 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 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 = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 3.0 3.3 3.6 V SUPPLY INPUTS (VBUS, VTRM, VL) Regulated Supply Voltage Output VTRM Internal regulator Operating Supply Current IVBUS Full-speed transmitting/receiving at 12Mbps, CL = 50pF on D+ and D- (Note 3) 10 mA IVL Full-speed transmitting/receiving at 12Mbps (Note 3) 2.5 mA Operating VL Supply Current Full-Speed Idle and SE0 Supply Current IVBUS(IDLE) Static VL Supply Current IVL(STATIC) Suspend Supply Current Full-speed idle: VD+ > 2.7V, VD- < 0.3V 250 350 SE0: VD+ < 0.3V, VD- < 0.3V 250 350 Full-speed idle, SE0, or suspend mode MAX3450E, MAX3451E 5 MAX3452E 15 IVBUS(SUSP) VM = VP = open, SUS = OE = high MAX3450E, MAX3451E (ENUM = low) 35 IVBUS(DIS) VL = GND or open MAX3452E Disable-Mode Supply Current Sharing-Mode VL Supply Current D+/D- Sharing-Mode Load Current D+/D- Disable-Mode Load Current 2 VBUS = GND or open, OE = low, VP = low or IVL(SHARING) high, VM = low or high, SUS = high µA µA 40 20 MAX3450E, MAX3451E 5 MAX3452E 20 µA µA ID_(SHARING) VBUS = GND or open, VD_ = 0 or +5.5V ID_(DIS) µA VL = GND or open, VD_ = 0 or +5.5V _______________________________________________________________________________________ 20 µA 5 µA ±15kV ESD-Protected USB Transceivers (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 = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX3450E/MAX3451E, supply lost USB Power-Supply Detection Threshold VTH_VBUS MAX3450E/MAX3451E, supply present (Note 4) VL Power-Supply Detection Threshold VHYST_VBUS UNITS 0.8 3.6 MAX3452E, supply lost MAX3452E, supply present USB Power-Supply Detection Hysteresis MAX 3.6 V 4.0 MAX3450E/MAX3451E 75 MAX3452E 40 VTH_VL mV 0.85 V DIGITAL INPUTS/OUTPUTS (VP, VM, RCV, SUS, OE, SPD, BD, ENUM) Input Voltage Low VIL VM, VP, SUS, SPD, ENUM, OE Input Voltage High VIH VM, VP, SUS, SPD, ENUM, OE Output Voltage Low VOL VM, VP, RCV, BD, IOL = +2mA Output Voltage High VOH VM, VP, RCV, BD, IOH = -2mA Input Leakage Current ILKG Input Capacitance CIN Measured from input to GND 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 Hysteresis VHYST Output Voltage Low VOLD RL = 1.5kΩ to +3.6V Output Voltage High VOHD RL = 15kΩ to GND 0.3 x VL 0.7 x VL V V 0.4 V +1 µA VL - 0.4 V -1 10 pF ANALOG INPUTS/OUTPUTS (D+, D-) ILZ CIND Measured from D_ to GND Driver Output Impedance ZDRV Steady-state drive ZIN RPULLUP V 0.8 V V 250 Transceiver Capacitance Internal Pullup Resistance 2.5 2.0 Off-State Leakage Current Input Impedance V 2.8 -1 Driver off ILOAD = 500µA (MAX3451E) (Note 5) mV 0.3 V 3.6 V +1 µA 20 4.0 pF 15.5 Ω MΩ 10 1.425 1.575 kΩ ESD PROTECTION (D+, D-) Human Body Model ±15 kV IEC 1000-4-2 Contact Discharge ±8 kV _______________________________________________________________________________________ 3 MAX3450E/MAX3451E/MAX3452E DC ELECTRICAL CHARACTERISTICS (continued) MAX3450E/MAX3451E/MAX3452E ±15kV ESD-Protected USB Transceivers 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 = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DRIVER CHARACTERISTICS (FULL-SPEED MODE, CL = 50pF) Rise Time tFR 10% to 90% of |VOHD - VOLD|, Figures 1, 6 4 20 ns Fall Time tFF 90% to 10% of |VOHD - VOLD|, Figures 1, 6 4 20 ns Rise-/Fall-Time Matching (Note 3) tFR/tFF Excluding the first transition from idle state, (Figures 1, 6) 90 110 % Output-Signal Crossover Voltage (Note 3) VCRS_F Excluding the first transition from idle state, (Figures 2, 6) 1.3 2.0 V tPLH_DRV Low-to-high transition 18 tPHL_DRV High-to-low transition 18 Driver Disable Delay (Figure 3) tPHZ_DRV High-to-off transition 20 tPLZ_DRV Low-to-off transition 20 Driver Enable Delay (Figure 3) tPZH_DRV Off-to-high transition 20 tPZL_DRV Off-to-low transition 20 Driver Propagation Delay (Figures 2, 6) ns ns ns DRIVER CHARACTERISTICS (LOW-SPEED MODE, CL = 200pF TO 600pF) Rise Time tLR 10% to 90% of |VOHD - VOLD|, Figures 1, 6 75 300 ns Fall Time tLF 90% to 10% of |VOHD - VOLD|, Figures 1, 6 75 300 ns Rise-/Fall-Time Matching tLR/tLF Excluding the first transition from idle state, Figures 1, 6 80 125 % Output-Signal Crossover Voltage VCRS_L Excluding the first transition from idle state, Figures 2, 6 1.3 2.0 V RECEIVER CHARACTERISTICS (CL = 15pF) Differential Receiver Propagation Delay, Figures 4, 6 tPLH_RCV Low-to-high transition 22 tPHL_RCV High-to-low transition 22 Single-Ended Receiver Propagation Delay, Figures 4, 6 tPLH_SE Low-to-high transition 12 tPHL_SE High-to-low transition 12 Single-Ended Receiver Disable Delay, Figure 5 tPHZ_SE High-to-off transition 15 tPLZ_SE Low-to-off transition 15 Single-Ended Receiver Enable Delay, Figure 5 tPZH_SE Off-to-high transition 15 tPZL_SE Off-to-low transition 15 Note 2: Parameters are 100% production tested at +25°C, 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 24.3Ω series resistor. 4 _______________________________________________________________________________________ ns ns ns ns ±15kV ESD-Protected USB Transceivers SINGLE-ENDED RECEIVER PROPAGATION DELAY vs. VL MAX3450-52E toc01 CL = 15pF 7 TA = +25°C CL = 400pF CL = 50pF TA = +85°C 5 D+/D1V/div D+/D1V/div 4 TA = -40°C 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 20ns/div 100ns/div SUPPLY CURRENT vs. D+/D- CAPACITANCE LOGIC SUPPLY CURRENT vs. D+/D- CAPACITANCE VL (V) VM 2V/div OE 5V/div SPD = VL, fIN = 6MHz SPD = GND, fIN = 750kHz 4 2 450 400 350 SPD = VL, fIN = 6MHz 300 250 200 150 SPD = GND, fIN = 750kHz 100 50 0 20ns/div 500 MAX3450-52E toc06 VP 2V/div 24 22 20 18 16 14 12 10 8 6 MAX3450-52E toc05 MAX3450-52E toc04 CL = 15pF LOGIC SUPPLY CURRENT (μA) OE, VP, AND VM TIMING SUPPLY CURRENT (mA) PROPAGATION DELAY (ns) MAX3450-52E toc03 MAX3450-52E toc02 8 6 RISE-/FALL-TIME MATCHING (LOW SPEED) RISE-/FALL-TIME MATCHING (FULL SPEED) 0 0 50 100 150 200 250 300 350 400 D+/D- CAPACITANCE (pF) 0 50 100 150 200 250 300 350 400 D+/D- CAPACITANCE (pF) _______________________________________________________________________________________ 5 MAX3450E/MAX3451E/MAX3452E Typical Operating Characteristics (VBUS = +5.0V, VL = +3.3V, TA = +25°C, unless otherwise noted.) ±15kV ESD-Protected USB Transceivers MAX3450E/MAX3451E/MAX3452E Pin Description PIN TSSOP THIN QFN-EP NAME 1 15 VL 2 1 SPD 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). 3 2 RCV Differential-Receiver Output. RCV responds to the differential input on D+ and D- (Tables 3 and 4). RCV asserts low if SUS = VL. 4 3 VP 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. 5 4 VM 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. 6 5, 8, 16 N.C. No Connection. Not internally connected. 7 6 GND Ground Digital I/O Connections Logic Supply. Connect a +1.65V to +3.6V supply to VL. Bypass VL to GND with a 0.1µF ceramic capacitor. 8 7 SUS 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. 9 9 OE 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). 10 10 D- 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 1.5kΩ resistor from D- to VTRM for low-speed (1.5Mbps) operation (MAX3450E and MAX3452E). 11 11 D+ 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 1.5kΩ resistor from D+ to VTRM for full-speed (12Mbps) operation (MAX3450E and MAX3452E). VTRM Internal Regulator Output. VTRM provides a regulated +3.3V output. Bypass VTRM to GND with a 1µF (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. 12 12 N.C. 13 13 ENUM BD 6 FUNCTION 14 14 VBUS — — EP No Connection. Not internally connected (MAX3450E). Enumerate Function Selection Input (MAX3451E). Drive ENUM to VL to connect the internal 1.5kΩ resistor between VTRM and D+ or D-, depending on the SPD state. Drive ENUM to GND to disconnect the internal 1.5kΩ resistor. For SPD = VL, the 1.5kΩ pullup resistor connects to D+. For SPD = GND, the 1.5kΩ 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 0.1µF 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. _______________________________________________________________________________________ ±15kV ESD-Protected USB Transceivers MAX3450E MAX3451E MAX3452E TO INTERNAL CIRCUITRY BD MAX3452E ONLY LDO REGULATOR VTH_VBUS VBUS VTRM VL SPD VP D+ VM D- OE LEVEL TRANSLATOR RCV SUS TO INTERNAL CIRCUITRY MAX3451E ONLY VTRM SPD CONTROL LOGIC ENUM GND 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- _______________________________________________________________________________________ 7 MAX3450E/MAX3451E/MAX3452E Functional Diagram MAX3450E/MAX3451E/MAX3452E ±15kV ESD-Protected USB Transceivers 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 1.5kΩ pullup resistor to VTRM. The enumerate function disconnects the 1.5kΩ 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. 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 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. 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 20µA 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 20µA 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) VTRM (V) VL (V) CONFIGURATION +4.0 to +5.5 +3.0 to +3.6 output +1.65 to +3.6 Normal mode NOTES — +3.1 to +4.5 +3.0 to +3.6 output +1.65 to +3.6 Battery supply MAX3450E, MAX3451E MAX3450E, MAX3451E +3.0 to +3.6 +3.0 to +3.6 input +1.65 to +3.6 Voltage regulator supply GND or floating Output +1.65 to +3.6 Sharing mode Table 2 +3.0 to +5.5 VBUS GND or floating Disable mode Table 2 Table 2. Disable-Mode and Sharing-Mode Connections INPUTS/OUTPUTS DISABLE MODE VBUS/VTRM • +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 (MAX3450E and MAX3451) • < +3.6V (MAX3452E) Floating or connected to GND +1.65V to +3.6V input VL D+ and D- High impedance SHARING MODE High impedance High impedance for OE = low VP and VM Invalid* RCV Invalid* Undefined** High impedance High impedance Invalid* Low SPD, SUS, OE, ENUM (MAX3451E) BD (MAX3452E) High for OE = high *High impedance or low **High or low 8 _______________________________________________________________________________________ ±15kV ESD-Protected USB Transceivers 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 1.5kΩ pullup resistor to D+ or D- to indicate the transmission speed to the host (see the SPD section). The MAX3451E provides an internal 1.5kΩ 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 1.5kΩ 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 1.5kΩ resistor between D+ and VTRM to set the full-speed (12Mbps) data rate, or connect the 1.5kΩ resistor between D- and VTRM to set the low-speed (1.5 Mbps) data rate. tFR, tLR tFF, tLF VOHD 90% 10% 90% 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). Table 3a. Transmit Truth Table (OE = 0, SUS = 0) INPUTS OUTPUTS OUTPUT STATE VP VM D+ D- RCV 0 0 0 0 X SE0 0 1 0 1 0 Logic 0 1 0 1 0 1 Logic 1 1 1 1 1 X Undefined X = Undefined. Table 3b. Transmit Truth Table (OE = 0, SUS = 1) INPUTS OUTPUTS OUTPUT STATE VP VM D+ D- RCV 0 0 0 0 0 SE0 0 1 0 1 0 Logic 0 1 0 1 0 0 Logic 1 1 1 1 1 0 Undefined Table 4a. Receive Truth Table (OE = 1 and SUS = 0) INPUTS OUTPUTS OUTPUT STATE D+ D- VP VM RCV 0 0 0 0 X SE0 0 1 0 1 0 Logic 0 1 0 1 0 1 Logic 1 1 1 1 1 X Undefined X = Undefined. 10% VOLD Figure 1. Rise and Fall Times _______________________________________________________________________________________ 9 MAX3450E/MAX3451E/MAX3452E Device Control MAX3450E/MAX3451E/MAX3452E ±15kV ESD-Protected USB Transceivers Table 4b. Receive Truth Table (OE = 1 and SUS = 1) INPUTS OUTPUTS VP AND VM RISE/FALL TIMES < 4ns VM OUTPUT STATE D+ D- VP VM RCV 0 0 0 0 0 SE0 0 1 0 1 0 Logic 0 1 0 1 0 0 Logic 1 1 1 1 1 0 Undefined VP tPLH_DRV tPHL_DRV D- 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 1µF 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 0.1µF ceramic capacitor as close to the device as possible. External Components External Resistors Proper USB operation requires two external resistors, each 24.3Ω ±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). 10 VCRS_F , VCRS_L D+ Figure 2. Timing of VP and VM to D+ and D- The MAX3450E/MAX3452E requires an external 1.5kΩ 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 0.1µF ceramic capacitor. Bypass VBUS to GND with a 0.1µF ceramic capacitor. Bypass VTRM to GND with a 1µF (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). ______________________________________________________________________________________ ±15kV ESD-Protected USB Transceivers 560Ω 150Ω VL +3V DUT DUT VP/VM D+/D- VP/VM D+/D560Ω 150Ω OE OE VP/VM CONNECTED TO GND, D+/D- CONNECTED TO PULLUP D+/D- CONNECTED TO GND, VP/VM CONNECTED TO PULLUP D+/DVP/VM tPLZ_DRV tPZL_DRV tPLZ_SE VP/VM CONNECTED TO VL, D+/D- CONNECTED TO PULLDOWN OE tPZL_SE D+/D- CONNECTED TO +3V, VP/VM CONNECTED TO PULLDOWN OE VP/VM D+/D- tPHZ_DRV tPZH_DRV tPHZ_SE tPZH_SE Figure 5. Enable and Disable Timing, Receiver Figure 3. Enable and Disable Timing, Driver INPUT RISE/FALL TIME < 4ns +3V MAX3450E MAX3451E MAX3452E D+ / D0 TEST POINT RCV, VM, AND VP CL (a) LOAD FOR RCV, VM, AND VP MAX3450E MAX3451E MAX3452E VL tPLH_RCV, tPLH_SE 24Ω TEST POINT D+ AND DCL RCV, VM, AND VP tPHL_RCV, tPHL_SE Figure 4. Timing of D+ and D- to RCV, VM, and VP 15kΩ (b) LOAD FOR D+/D- Figure 6. Test Circuits ______________________________________________________________________________________ 11 MAX3450E/MAX3451E/MAX3452E VL +3V MAX3450E/MAX3451E/MAX3452E ±15kV ESD-Protected USB Transceivers 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 1MΩ CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF RD 1.5kΩ DISCHARGE RESISTANCE DEVICE UNDER TEST 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 1.5kΩ resistor. IP 100% 90% Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPERES 36.8% 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 TIME tDL CURRENT WAVEFORM Figure 8. Human Body Model Current Waveform RC 50Ω to 100Ω CHARGE-CURRENTLIMIT RESISTOR 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. tRL HIGHVOLTAGE DC SOURCE Cs 150pF RD 330Ω DISCHARGE RESISTANCE STORAGE CAPACITOR Figure 9. IEC 1000-4-2 ESD Test Model 12 ______________________________________________________________________________________ DEVICE UNDER TEST ±15kV ESD-Protected USB Transceivers +1.65V TO +3.6V 0.1μF 0.1μF VL VL(I/O) VP VBUS PC USB POWER D- 24.3Ω 1% D24.3Ω 1% VM ASIC RCV MAX3451E D+ D+ GND GND ENUM SUS 15kΩ 15kΩ VTRM 1μF SPD OE Chip Information PROCESS: BiCMOS Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 14 TSSOP U14-1 21-0066 16 Thin QFN-EP T1633-4 21-0136 ______________________________________________________________________________________ 13 MAX3450/MAX3451E/MAX3452E Typical Operating Circuit MAX3450/MAX3451E/MAX3452E ±15kV ESD-Protected USB Transceivers Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 4/03 Initial release ⎯ 1 11/03 Changed specs ⎯ 2 10/08 Added lead-free packaging. Updated Absolute Maximum Ratings information of package thermal resistances. Updated EC table notation. 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 © 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.