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19-4597; Rev 0; 4/09
USB 2.0 Hi-Speed and Audio Switches with Negative Signal Capability and 15kV ESD
General Description
The MAX14531E-MAX14534E high ESD-protected DP3T switches multiplex Hi-Speed (480 Mbps) USB signals, low/full-speed USB signals, and analog signals such as AC-coupled audio or video through any of three channels. These devices combine the low oncapacitance (CON) and low on-resistance (RON) necessary for high-performance switching applications in portable electronics, and include an internal negative supply to pass AC-coupled audio signals that swing below ground (down to -2.0V). The MAX14531E- MAX14534E operate from a +2.7V to +5.5V supply. The MAX14531E-MAX14534E have a shutdown function to reduce supply current and set all channels to high impedance. The MAX14531E-MAX14534E feature a VBUS detection function through the CB0 input to automatically switch to the default USB signal path upon detection of a valid VBUS signal. The MAX14532E/MAX14534E feature internal shunt resistors on audio channels to reduce clicks and pops heard at the output. The MAX14531E-MAX14534E are available in a spacesaving, 12-bump, 1.5mm x 2.0mm WLP package and operate over the -40C to +85C temperature range. Low 10A (typ) Supply Current -3dB Bandwidth: 800MHz (typ) Low 2 (typ) On-Resistance 0.05% THD+N Internal Shunt Resistor for Click-and-Pop Reduction (MAX14532E/MAX14534E) VBUS Detection for Automatic Switch Path Selection +28V Maximum Rated VBUS Detection Input (CB0) Space-Saving, 12-Bump, 1.5mm x 2.0mm WLP Package
Features
Single +2.7V to +5.5V Supply Voltage
MAX14531E-MAX14534E
Applications
Cell Phones MP3 Players PDAs Notebook Computers
Ordering Information/Selector Guide
PART MAX14531EEWC+ MAX14532EEWC+ MAX14533EEWC+* MAX14534EEWC+* PIN-PACKAGE 12 WLP 12 WLP 12 WLP 12 WLP SHUNT RESISTORS NONE UAZ_ NONE UAY_/UAZ_ CB0 PULLDOWN RESISTOR No Yes Yes Yes TOP MARK AAT AAU AAV AAW
Note: All devices are specified over the -40C to +85C operating temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. *Future product--contact factory for availability.
________________________________________________________________ Maxim Integrated Products
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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.
USB 2.0 Hi-Speed and Audio Switches with Negative Signal Capability and 15kV ESD MAX14531E-MAX14534E
Test Circuits/Timing Diagrams
MAX14531E MAX14532E MAX14533E V MAX14534E IN
LOGIC INPUT VOUT RL CB0, CB1 LOGIC INPUT GND SWITCH OUTPUT 0 t ON CL VOUT 0.9 x V0UT t OFF 0.9 x VOUT VIH 50% VIL t R < 5ns t F < 5ns
UAX_, UAY_, UAZ_
COM_
VOUT = VN_
CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL RL + RON
(
)
Figure 1. Switching Time
MAX14531E MAX14532E MAX14533E MAX14534E
RS VIN+
UAX1, UAY1, or UAZ1
COM1 RL
VOUT+
tPLH = tPLHX OR tPLHY tPHL = tPHLX OR tPHLY tSK(O) = |tPLHX - tPLHY| OR |tPHLX - tPHLY| tSK(P) = |tPLHX - tPHLX| OR |tPLHY - tPHLY|
RS VIN-
UAX2, UAY2, or UAZ2
COM2
VOUTRL
CB0, CB1 VIL TO VIH tINRISE VCC VIN+ 0 VCC VIN0 tOUTRISE tPLHX VCC VOUT+ 0 VCC VOUT0 tPHLY tPLHY 50% 50% 50% 50% 10% 10% tPHLX 90% 90% tOUTFALL 50% 50% 50% 50% 10% 10% 90% tINFALL
90%
Figure 2. Output Skew
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USB 2.0 Hi-Speed and Audio Switches with Negative Signal Capability and 15kV ESD
Test Circuits/Timing Diagrams (continued)
V OFF-ISOLATION = 20log OUT VIN 50 VOUT ON-LOSS = 20log VIN V CROSSTALK = 20log OUT VIN
MAX14531E-MAX14534E
NETWORK ANALYZER UAX1, UAY1, OR UAZ1 UAX1, MAX14531E- UAY1, MAX14534E OR UAZ1 VIN 50
50
*COM1
VOUT
MEAS
REF
50
50
OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" UAX_, UAY_, OR UAZ_ TERMINAL ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" UAX_, UAY_, OR UAZ_ TERMINAL ON EACH SWITCH. CROSSTALK IS MEASURED FROM ONE CHANNEL TO THE OTHER CHANNEL.
*FOR CROSSTALK, THIS PIN IS COM2. UAX2, UAY2, AND UAZ2 ARE OPEN.
Figure 3. On-Loss, Off-Isolation, and Crosstalk
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USB 2.0 Hi-Speed and Audio Switches with Negative Signal Capability and 15kV ESD MAX14531E-MAX14534E
Detailed Description
The MAX14531E-MAX14534E are high ESD-protected single DP3T switches that operate from a +2.7V to +5.5V supply and are designed to multiplex USB 2.0 Hi-Speed signals and AC-coupled analog signals. These switches combine the low on-capacitance (CON) and low on-resistance (RON) necessary for high-performance switching applications. These devices also meet the requirements for USB low-speed and full-speed signaling. The negative signal capability of all three channels allows signals below ground to pass through without distortion.
Shutdown Mode
The MAX14531E-MAX14534E feature a shutdown mode to reduce the supply current to less than 1A and place the switches in high impedance. Drive both CB0 and CB1 low to place the devices in shutdown mode (see the Functional Diagram/Truth Table.)
Click-and-Pop Suppression
The switched 100 shunt resistors on the MAX14532E/ MAX14534E automatically discharge any capacitance at the UAZ_ (MAX14532E) or UAY_ and UAZ_ (MAX14534E) inputs when they are unconnected from COM_ (see the Functional Diagram/Truth Table). This reduces audio click-and-pop sounds that may occur when switching to audio sources.
Analog Signal Levels
The MAX14531E-MAX14534E are bidirectional, allowing UAX_, UAY_, UAZ_, and COM_ to be configured as either inputs or outputs. Note that UAX_, UAY_, and UAZ_ are only protected against ESD up to 2kV (Human Body Model) and may require additional ESD protection if used as outputs. These devices feature a charge pump that generates a negative supply to allow analog signals as low as -2.0V applied to UAX_, UAY_, UAZ_, or COM_. The negative charge pump is only active when the part is enabled (CB0 or CB1 = 1). Connect negative signals to UAX_, UAY_, UAZ_, or COM_ only when the device is enabled.
Applications Information
Extended ESD Protection
ESD-protection structures are incorporated on all pins to protect against electrostatic discharges up to 2kV (Human Body Model) encountered during handling and assembly. COM1 and COM2 are further protected against ESD up to 15kV (Human Body Model) without damage. The ESD structures withstand high ESD both in normal operation and when the device is powered down. After an ESD event, the MAX14531E- MAX14534E continue to function without latchup.
VBUS Detection
The MAX14531E-MAX14534E feature a VBUS detection input (CB0) that connects COM_ to UAX_ when VCB0 exceeds the VBUS detection threshold (VVBDET) (see the Functional Diagram/Truth Table). Note that the MAX14531E requires an external pulldown resistor when using this function.
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.
Human Body Model
Figure 4 shows the Human Body Model, and Figure 5 shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest that is then discharged into the device through a 1.5k resistor.
Digital Control Inputs
The MAX14531E-MAX14534E provide control logic inputs, CB0 and CB1, to control the switch position as shown in the Functional Diagram/Truth Table. Drive CB_ rail-to-rail to minimize power consumption.
RC 1M CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE RD 1500 DISCHARGE RESISTANCE DEVICE UNDER TEST
IP 100% 90% AMPERES 36.8% 10% 0 0 tRL TIME
Ir
PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
Cs 100pF
STORAGE CAPACITOR
tDL CURRENT WAVEFORM
Figure 4. Human Body ESD Test Model
4
Figure 5. Human Body Current Waveform
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USB 2.0 Hi-Speed and Audio Switches with Negative Signal Capability and 15kV ESD
Layout
USB Hi-Speed requires careful PCB layout with 45 single-ended/90 differential controlled impedance matched traces of equal lengths. Ensure that bypass capacitors are as close as possible to the device. Use large ground planes where possible.
Power-Supply Sequencing
Caution: Do not exceed the absolute maximum ratings because stresses beyond the listed ratings may cause permanent damage to the device. Proper power-supply sequencing is recommended for all devices. Apply VCC before applying analog signals, especially if the analog signal is not current limited.
MAX14531E-MAX14534E
Chip Information
PROCESS: BiCMOS
PACKAGE TYPE 12 WLP
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE CODE W121A2-1 DOCUMENT NO. 21-0009
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 _____________________ 5
(c) 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

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