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19-3472; Rev 0; 10/04
7 Quad SPST Switches with Over-Rail Signal Handling
General Description
The MAX4854 quad single-pole/single-throw (SPST) switch operates from a single +2V to +5.5V supply and can handle signals greater than the supply rail. This switch features low 7 on-resistance with 30pF oncapacitance, making it ideal for switching data signals. For over-rail applications, this device passes signals greater than the positive supply (up to +5.5V) through the switch without distortion. The MAX4854 is available in the space-saving, 16-pin, 3mm x 3mm thin QFN package and operates over the -40C to +85C extended temperature range. Switches Signals Greater than VCC 7 On-Resistance 30pF On-Capacitance 150MHz, -3dB Bandwidth 1.8V Logic Compatibility +2V to +5.5V Supply Range Low 0.01A Supply Current Available in a Space-Saving, 3mm x 3mm, 16-Pin TQFN Package
Features
USB 2.0 Full Speed (12Mbps) and USB 1.1 Signal Switching
MAX4854
Applications
USB Switching Cellular Phones Notebook Computers PDAs and Other Handheld Devices
PART MAX4854ETE
Ordering Information
TEMP RANGE -40C to +85C PINPACKAGE 16 TQFN-EP* TOP MARK ACE
*EP = Exposed paddle.
Block Diagram/Truth Table
IN1
Pin Configuration
VCC 14 IN4 13 12 COM4 11 N.C. 10 NO4 9 5 NO2 6 GND 7 NO3 8 COM3 IN3
TOP VIEW
16
COM1 NO1 1 2 3 4 N.C. IN2
15
MAX4854
NO1 7
TRUTH TABLE IN_ 0 1 NO_ OFF ON
COM1 IN1 COM2 7 IN2 COM2 COM3 7 IN3 COM4 7 IN4
MAX4854
NO2
NO3
SWITCHES SHOWN FOR LOGIC "0" INPUT
NO4
3mm x 3mm THIN QFN
CONNECT EXPOSED PADDLE TO PC BOARD GROUND.
________________________________________________________________ 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.
7 Quad SPST Switches with Over-Rail Signal Handling MAX4854
ABSOLUTE MAXIMUM RATINGS
VCC, IN_, COM_, NO_ to GND (Note 1) ................-0.3V to +6.0V Closed-Switch Continuous Current COM_, NO_, NC_ .....50mA Peak Current COM_, NO_ (pulsed at 1ms, 50% duty cycle)................................100mA Peak Current COM_, NO_ (pulsed at 1ms, 10% duty cycle)................................120mA Continuous Power Dissipation (TA = +70C) 16-Pin Thin QFN (derate 20.8mW/C above +70C) ....1667mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Note 1: Signals on IN_, NO_, or COM_ below GND are clamped by internal diodes. Limit forward-diode current to maximum current rating.
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
(VCC = +2.7V to +5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +3.0V, TA = +25C, unless otherwise noted.) (Note 2)
PARAMETER Supply Voltage Supply Current ANALOG SWITCH Analog Signal Range On-Resistance On-Resistance Match Between Channels (Notes 3, 4) On-Resistance Flatness (Note 5) NO_ Off-Leakage Current COM_ On-Leakage Current Skew (Note 3) Propagation Delay (Note 3) Turn-On Time Turn-Off Time Charge Injection Off-Isolation (Note 6) Crosstalk -3dB Bandwidth BW VNO_, VCOM_ RON VCC = +3V, ICOM_ = 10mA, VNO_ = 0 to +5.5V VCC = +3V, ICOM = 10mA, VNO_ = +1.5V VCC = +3V; ICOM_ = 10mA; VNO_ = +1V, +2V, +3V VCC = +5.5V, VNO_ = +1V or +4.5V, VCOM_ = +4.5V or +1V VCC = +5.5V; VNO_ = +1V, +4.5V, or floating; VCOM_ = +1V, +4.5V, or floating RS = 39, CL = 50pF, Figure 2 RS = 39, CL = 50pF, Figure 2 VCC = +3V, VNO_ = +1.5V, RL = 300, CL = 50pF, Figure 1 VCC = +3V, VNO_ = +1.5V, RL = 300, CL = 50pF, Figure 1 TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C 8 -80 -95 150 30 TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C -2 -10 -2 - 12.5 0.1 0.9 40 2.5 0.2 0 7 5.5 9 10 0.4 0.5 3.75 4.0 +2 +10 +2 +12.5 1 2 60 100 40 60 nA nA V SYMBOL VCC ICC VCC = +5.5V, VIN_ = 0 or VCC CONDITIONS MIN 2.0 0.01 TYP MAX 5.5 1 UNITS V A
RON
RFLAT IOFF ION
DYNAMIC CHARACTERISTICS tSKEW tPD tON tOFF Q ns ns ns ns pC dB dB MHz
VCOM_ = +1.5V, RS = 0, CL = 1nF, Figure 3 f = 100kHz, VCOM_ = 1VRMS, RL = 50, CL = 5pF, Figure 4 f = 1MHz, VCOM_ = 1VRMS, RL = 50, CL = 5pF, Figure 4 Signal = 0dBm, RL = 50, CL = 5pF, Figure 4
2
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7 Quad SPST Switches with Over-Rail Signal Handling
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.7V to +5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +3.0V, TA = +25C, unless otherwise noted.) (Note 2)
PARAMETER NO_ Off-Capacitance COM On-Capacitance Total Harmonic Distortion DIGITAL I/O (IN_) Input Logic High Voltage Input Logic Low Voltage Input Leakage VIH VIL IIN VCC = +2V to +3.6V VCC = +3.6V to +5.5V VCC = +2V to +3.6V VCC = +3.6V to +5.5V VIN_ = 0 or +5.5V -0.5 1.4 1.8 0.5 0.8 +0.5 V V A SYMBOL COFF CON THD f = 1MHz, Figure 5 f = 1MHz, Figure 5 f = 20Hz to 20kHz, VCOM_ = 1V +2VP-P, RL = 600 CONDITIONS MIN TYP 13 30 0.04 MAX UNITS pF pF %
MAX4854
Note 2: Specifications are 100% tested at TA = +85C only, and guaranteed by design and characterization over the specified temperature range. Note 3: Guaranteed by design and characterization; not production tested. Note 4: RON = RON(MAX) - RON(MIN). Note 5: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal ranges. Note 6: Off-isolation = 20log10 (VCOM_ / VNO_), VCOM_ = output, VNO_ = input to off switch.
Typical Operating Characteristics
(VCC = 3.0V, TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. COM VOLTAGE
MAX4854 toc01
ON-RESISTANCE vs. COM VOLTAGE
MAX4854 toc02
ON-RESISTANCE vs. COM VOLTAGE
VCC = 5.0V 5.0 ON-RESISTANCE () 4.5 4.0 3.5 3.0 2.5 TA = +25C TA = +85C
MAX4854 toc03
45 40 35 ON-RESISTANCE () 30 25 20 15 10 5 0 0 2 4 6 COM VOLTAGE (V) VCC = 2.0V VCC = 2.3V VCC = 2.5V VCC = 3.0V VCC = 5.0V VCC = 1.8V
8 VCC = 3.0V 7 TA = +85C ON-RESISTANCE () 6 5 4 3 2 0 2 4 6 COM VOLTAGE (V) TA = +25C TA = -40C
5.5
2.0 1.5 0 1 2 3
TA = -40C 4 5 6
COM VOLTAGE (V)
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3
7 Quad SPST Switches with Over-Rail Signal Handling MAX4854
Typical Operating Characteristics (continued)
(VCC = 3.0V, TA = +25C, unless otherwise noted.)
TURN-ON/TURN-OFF TIME vs. SUPPLY VOLTAGE
MAX4854 toc05
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4854 toc04
TURN-ON/TURN-OFF TIME vs. TEMPERATURE
MAX4854 toc06
1.0
60 50 40 tON 30 20 tOFF 10 0
34 32 tON 30 28 26 tOFF 24 22 20
TURN-ON/TURN-OFF TIME (ns)
0.8 SUPPLY CURRENT (nA) TA = +85C 0.6
0.4
0.2
TA = +25C
TA = -40C 3.5 4.0 4.5 5.0 5.5
0 1.5 2.0 2.5 3.0 SUPPLY VOLTAGE (V)
1.5
2.5
3.5
4.5
TURN-ON/TURN-OFF TIME (ns)
5.5
-40
-15
10
35
60
85
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
LOGIC THRESHOLD vs. SUPPLY VOLTAGE
MAX4854 toc07
CHARGE INJECTION vs. COM VOLTAGE
MAX4854 toc08
LEAKAGE CURRENT vs. TEMPERATURE
1.4 LEAKAGE CURRENT (nA) 1.2 1.0 0.8 0.6 0.4 0.2 0 COM OFF-LEAKAGE COM ON-LEAKAGE
MAX4854 toc09
1.6
30
1.6
1.4 LOGIC THRESHOLD (V) VIN RISING 1.2
CHARGE INJECTION (pC)
20 VCC = 3V
1.0 VIN FALLING 0.8
10 VCC = 5V
0.6 1.5 2.5 3.5 4.5 5.5 SUPPLY VOLTAGE (V)
0 0 1 2 3 4 5 COM VOLTAGE (V)
-40
-15
10
35
60
85
TEMPERATURE (C)
FREQUENCY RESPONSE
MAX4854 toc10
TOTAL HARMONIC DISTORTION vs. FREQUENCY
RL = 600
MAX4854 toc11
SWITCH PASSING SIGNALS ABOVE SUPPLY VOLTAGE
MAX4854 toc12
20 0 -20 -40 -60 ON-RESPONSE
1
VCC = 3.0V VNC 2V/div
FREQUENCY RESPONSE (dB)
THD (%)
0V 0.1
OFF-RESPONSE
VCOM -80 -100 0.1 1 10 FREQUENCY (MHz) 100 1000 CROSSTALK 0V 0.01 10 100 1k FREQUENCY (Hz) 10k 100k 200s/div
4
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7 Quad SPST Switches with Over-Rail Signal Handling
Pin Description
PIN 1 2, 11 3 4 5 6 7 8 9 10 12 13 14 15 16 EP NAME NO1 N.C. IN2 COM2 NO2 GND NO3 COM3 IN3 NO4 COM4 IN4 VCC IN1 COM1 GND Normally Open Terminal for Analog Switch 1 No Connection. Not internally connected. Digital Control Input for Analog Switch 2. A logic-low on IN2 disconnects COM2 from NO2 and a logic-high connects COM2 to NO2. Common Terminal for Analog Switch 2 Normally Open Terminal for Analog Switch 2 Ground Normally Open Terminal for Analog Switch 3 Common Terminal for Analog Switch 3 Digital Control Input for Analog Switch 3. A logic-low on IN3 disconnects COM3 from NO3 and a logic-high connects COM3 to NO3. Normally Open Terminal for Analog Switch 4 Common Terminal for Analog Switch 4 Digital Control Input for Analog Switch 4. A logic-low on IN4 disconnects COM4 from NO4 and a logic-high connects COM4 to NO4. Supply Voltage. Bypass to GND with a 0.01F capacitor as close to the pin as possible. Digital Control Input for Analog Switch 1. A logic-low on IN1 disconnects COM1 from NO1 and a logic-high connects COM1 to NO1. Common Terminal for Analog Switch 1 Exposed Pad. Connect to ground. FUNCTION
MAX4854
_______________________________________________________________________________________
5
7 Quad SPST Switches with Over-Rail Signal Handling MAX4854
Detailed Description
The MAX4854 low on-resistance, low-voltage, analog switch is designed to operate from a +2V to +5.5V single supply and is fully specified for nominal +3.0V applications. The device features over-rail signal capability that allows signals up to +5.5V with supply voltages down to +2.0V to pass through without distortion. This quad SPST switch has low on-channel capacitance, which allows switching of the data signals for USB 2.0/1.1 applications (12Mbps). It is designed to switch D+ and D- USB signals with a guaranteed skew of less than 1ns (see Figure 2) as measured from 50% of the input signal to 50% of the output signal.
Analog Signal Levels
The on-resistance of these switches changes very little for analog input signals across the entire supply voltage range (see the Typical Operating Characteristics). The switches are bidirectional; therefore, NO_ and COM_ can be either inputs or outputs.
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 CMOS devices. Always apply VCC before applying analog signals, especially if the analog signal is not current limited.
Applications Information
Digital Control Inputs
The logic inputs (IN_) accept up to +5.5V even if the supply voltages are below this level. For example, with a +3.3V VCC supply, IN_ can be driven low to GND and high to +5.5V, allowing for mixing of logic levels in a system. Driving IN_ rail-to-rail minimizes power consumption. For a +2V supply voltage, the logic thresholds are +0.5V (low) and +1.4V (high); for a +5V supply voltage, the logic thresholds are +0.8V (low) and +1.8V (high).
Typical Operating Circuit
D+ DATA SOURCE 1 (USB) D-
NO1 7 NO2 7
COM1 IN1 COM2 IN2 D+ DATA 1 ENABLE
MAX4854
D+ DATA SOURCE 2 (USB) DNO3 7 NO4 7 COM3 IN3 COM4 IN4
DUSB CONNECTOR
DATA 2 ENABLE
6
_______________________________________________________________________________________
7 Quad SPST Switches with Over-Rail Signal Handling
Test Circuits/Timing Diagrams
MAX4854
MAX4854
VCC V CC VNO NO_ COM_ VOUT RL IN_ CL SWITCH OUTPUT VOUT 0V t ON LOGIC INPUT VCC 50% 0V t OFF 0.9 x V0UT
t R < 20ns t F < 20ns
0.9 x VOUT
LOGIC INPUT
GND
VOUT = VNO
CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL RL + RON
(
)
Figure 1. Switching Time
tri 50% TxD+ Rs A B CL INPUT A90% 50% INPUT A 10%
90%
tskew_i
10% tfi
tro 50%
90%
TxDRs Rs = 39 CL = 50pF
A-
BCL
OUTPUT B OUTPUT B-
10%
tskew_o 90% 50% 10% tfo
|tro - tri| DELAY DUE TO SWITCH FOR RISING INPUT AND RISING OUTPUT SIGNALS. |tfo - tfi| DELAY DUE TO SWITCH FOR FALLING INPUT AND FALLING OUTPUT SIGNALS.
|tskew_o| CHANGE IN SKEW THROUGH THE SWITCH FOR OUTPUT SIGNALS. |tskew_i| CHANGE IN SKEW THROUGH THE SWITCH FOR INPUT SIGNALS.
Figure 2. Input/Output Skew Timing Diagram _______________________________________________________________________________________ 7
7 Quad SPST Switches with Over-Rail Signal Handling MAX4854
Test Circuits/Timing Diagrams (continued)
V CC
MAX4854
VCC RGEN NO_ COM_ CL GND IN_ IN OFF ON Q = (V OUT )(C L ) VOUT VOUT
VOUT
V GEN
VIL TO VIH
OFF
Figure 3. Charge Injection
+5V 10nF NETWORK ANALYZER VCC 0V OR VCC IN_ COM1 VIN 50 50
V OFF-ISOLATION = 20log OUT VIN ON-LOSS = 20log VOUT VIN
MAX4854
NO1* GND VOUT MEAS REF
V CROSSTALK = 20log OUT VIN
50
50
MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND OFF NO_ TERMINAL ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN COM_ AND ON NO_ TERMINAL ON EACH SWITCH. CROSSTALK IS MEASURED FROM ONE CHANNEL TO THE OTHER CHANNEL. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
*FOR CROSSTALK, THIS PIN IS NO2. COM2 IS OPEN.
Figure 4. On-Loss, Off-Isolation, and Crosstalk
8
_______________________________________________________________________________________
7 Quad SPST Switches with Over-Rail Signal Handling
Test Circuits/ Timing Diagrams (continued) Chip Information
TRANSISTOR COUNT: 735 PROCESS: CMOS
MAX4854
10nF
V CC
VCC COM_
MAX4854
IN CAPACITANCE METER NO_ f = 1MHz GND
VIL OR VIH
Figure 5. Channel Off-/On-Capacitance
_______________________________________________________________________________________
9
7 Quad SPST Switches with Over-Rail Signal Handling MAX4854
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.)
D2 b
0.10M C A B
D D/2
D2/2
E/2
E2/2
C L
E
(NE-1)Xe
E2
L
C L
e
k (ND-1)Xe
C L
0.10 C 0.08 C A A2 A1 L
C L
L
e
e
PACKAGEOUTLINE 12,16L,THINQFN,3x3x0.8mm
21-0136
E
1
2
10
______________________________________________________________________________________
12x16L QFN THIN.EPS
7 Quad SPST Switches with Over-Rail Signal Handling
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.)
MAX4854
EXPOSEDPADVARIATIONS
DOWN BONDS ALLOWED
NOTES: 1.DIMENSIONING&TOLERANCINGCONFORMTOASMEY14.5M-1994. 2.ALLDIMENSIONSAREINMILLIMETERS.ANGLESAREINDEGREES. 3.NISTHETOTALNUMBEROFTERMINALS. 4.THETERMINAL#1IDENTIFIERANDTERMINALNUMBERINGCONVENTIONSHALLCONFORMTO JESD95-1SPP-012.DETAILSOFTERMINAL#1IDENTIFIERAREOPTIONAL,BUTMUSTBELOCATED WITHINTHEZONEINDICATED.THETERMINAL#1IDENTIFIERMAYBEEITHERAMOLDOR MARKEDFEATURE. 5.DIMENSIONbAPPLIESTOMETALLIZEDTERMINALANDISMEASUREDBETWEEN0.20mmAND0.25mm FROMTERMINALTIP. 6.NDANDNEREFERTOTHENUMBEROFTERMINALSONEACHDANDESIDERESPECTIVELY. 7.DEPOPULATIONISPOSSIBLEINASYMMETRICALFASHION. 8.COPLANARITYAPPLIESTOTHEEXPOSEDHEATSINKSLUGASWELLASTHETERMINALS. 9.DRAWINGCONFORMSTOJEDECMO220REVISIONC.
PACKAGEOUTLINE 12,16L,THINQFN,3x3x0.8mm
21-0136
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 ____________________ 11 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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