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19-3471; Rev 0; 10/04
3.5/7 Quad SPST Switches with Over-Rail Signal Handling
General Description
The MAX4851/MAX4851H/MAX4853/MAX4853H family of quad single-pole/single-throw (SPST) switches operates from a single +2V to +5.5V supply and can handle signals greater than the supply rail. These switches feature low 3.5 on-resistance with 40pF on-capacitance or 7 on-resistance with 30pF on-capacitance, making them ideal for switching audio and data signals. The MAX4851/MAX4851H are configured with four SPST switches and feature a comparator for headphone detection or mute/send key functions. The MAX4853/MAX4853H have four SPST switches but do not include a comparator. For over-rail applications, these devices offer either the pass-through or high-impedance option. For the MAX4851/ MAX4853, signals greater than the positive supply (up to 5.5V) pass through the switch without distortion. For the MAX4851H/MAX4853H, the switch input becomes high impedance when the input signal exceeds the supply rail. The MAX4851/MAX4851H/MAX4853/MAX4853H are available in the space-saving, 16-pin, 3mm x 3mm thin QFN package and operate over the -40C to +85C extended temperature range.
Features
o USB 2.0 Full Speed (12Mbps) and USB 1.1 Signal Switching o Switch Signals Greater than VCC o +2V to +5.5V Supply Range o 3.5/7 On-Resistance o 30pF On-Capacitance (7 Switch) o 150MHz -3dB Bandwidth o 1.8V Logic Compatibility o Low Supply Current 0.01A (MAX4853) 5A (MAX4851) 10A (MAX4851H/MAX4853H) o Low 0.01nA Leakage Current o Available in a Space-Saving 3mm x 3mm, 16-Pin TQFN Package
MAX4851/MAX4851H/MAX4853/MAX4853H
Ordering Information
PART MAX4851ETE MAX4853ETE TEMP RANGE PIN-PACKAGE -40C to +85C 16 TQFN-EP* -40C to +85C 16 TQFN-EP* TOP MARK ABW ABX ACB ACC
MAX4851HETE -40C to +85C 16 TQFN-EP*
Applications
USB Switching Audio Signal Routing Cellular Phones Notebook Computers PDAs and Other Handheld Devices
MAX4853HETE -40C to +85C 16 TQFN-EP*
*EP = Exposed paddle.
Block Diagram/Truth Table
MAX4851 MAX4851H
NO1 3.5 NO2 3.5 NO3 3.5 NO4 3.5 VCC 3 COM1 IN1 COM2 IN2 COM3 IN3 COM4 IN4
TRUTH TABLE IN_ 0 1 NO_ OFF ON
MAX4853 MAX4853H
NO1 3.5 NO2 7 NO3 3.5 NO4 7 COM1 IN1 COM2 IN2 COM3 IN3 COM4 IN4
SWITCHES SHOWN FOR LOGIC "0" INPUT
Pin Configurations and Typical Operating Circuit appear at end of data sheet
COUT CIN
________________________________________________________________ Maxim Integrated Products
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3.5/7 Quad SPST Switches with Over-Rail Signal Handling MAX4851/MAX4851H/MAX4853/MAX4853H
ABSOLUTE MAXIMUM RATINGS
VCC, IN_, CIN, COM_, NO_ to GND (Note 1) ........-0.3V to +6.0V COUT..........................................................-0.3V to (VCC + 0.3V) COUT Continuous Current................................................20mA Closed-Switch Continuous Current COM_, NO_, NC_ 3.5 Switch ................................................................100mA 7 Switch .....................................................................50mA Peak Current COM_, NO_ (pulsed at 1ms, 50% duty cycle) 3.5 Switch ................................................................200mA 7 Switch ...................................................................100mA Peak Current COM_, NO_ (pulsed at 1ms, 10% duty cycle) 3.5 Switch ................................................................240mA 7 Switch ...................................................................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 (3.5 Switch) Analog Signal Range VNO_, VCOM_ VCC = 3V, ICOM_ = 10mA, VNO_ = 0 to 5.5V (MAX485_) or VCC (MAX485_H) VCC = 3V; ICOM = 10mA; VNO_ = 1.5V VCC = 3V, ICOM_ = 10mA, VNO_ = 1V, 2V, 3V TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C -2 -10 -2 -12.5 135 1.2 0.1 0 3.5 5.5 4.5 5 0.2 0.25 1.8 2 +2 nA +10 +2 nA TA = -40C to +85C +12.5 MHz V SYMBOL VCC MAX4851 ICC VCC = 5.5V, VIN_ = 0 or VCC MAX4851H/MAX4853H MAX4853 CONDITIONS MIN 2.0 5 10 0.01 TYP MAX 5.5 10 20 1 A UNITS V
On-Resistance
RON
On-Resistance Match Between Channels (Notes 3, 4) On-Resistance Flatness (Note 5)
RON
RFLAT
NO_ Off-Leakage Current
IOFF
VCC = 5.5V, VNO_ TA = +25C = 1V or 4.5V, VCOM_ = 4.5V or 1V TA = -40C to +85C VCC = 5.5V; VNO_ = 1V, 4.5V, or floating; VCOM_ = 1V, 4.5V, or floating TA = +25C
COM_ On-Leakage Current
ION
-3dB Bandwidth
BW
Signal = 0dBm, RL = 50, CL = 5pF, Figure 4
2
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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 ANALOG SWITCH (7 Switch) Analog Signal Range VNO_, VCOM_ VCC = 3V, ICOM_ = 10mA, VNO_ = 0 to 5.5V (MAX485_), or VCC (MAX485_H) VCC = 3V, ICOM = 10mA, VNO_ = 1.5V VCC = 3V; ICOM_ = 10mA; VNO_ = 1V, 2V, 3V TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C -2 -10 -2 - 12.5 150 13 30 2.5 0.2 0 7 5.5 9 10 0.4 0.5 3.75 4.0 +2 nA +10 +2 nA TA = -40C to +85C +12.5 MHz pF pF V SYMBOL COFF CON CONDITIONS f = 1MHz, Figure 5 f = 1MHz, Figure 5 MIN TYP 20 40 MAX UNITS pF pF
MAX4851/MAX4851H/MAX4853/MAX4853H
On-Resistance
RON
On-Resistance Match Between Channels (Notes 3, 4) On-Resistance Flatness (Note 5)
RON
RFLAT
NO_ Off-Leakage Current
IOFF
VCC = 5.5V, VNO_ TA = +25C = 1V or 4.5V, VCOM_ = 4.5V or 1V TA = -40C to +85C VCC = 5.5V; VNO_ = 1V, 4.5V, or floating; VCOM_ = 1V, 4.5V, or floating TA = +25C
COM_ On-Leakage Current
ION
-3dB Bandwidth NO_ Off-Capacitance COM On-Capacitance DYNAMIC CHARACTERISTICS Signal Over-Rail to HighImpedance Switching Time High-Impedance to Low-Impedance Switching Time Skew (Note 3) Propagation Delay (Note 3) Turn-On Time
BW COFF CON
Signal = 0dBm, RL = 50, CL = 5pF, Figure 4 f = 1MHz, Figure 5 f = 1MHz, Figure 5 MAX4851H/MAX4853H, VNO_ = VCC to (VCC + 0.5V), VCC < 5V, Figure 1 MAX4851H/MAX4853H, VNO_ = (VCC + 0.5V) to VCC, VCC < 5V, Figure 1 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
tHIZ tHIZB tSKEW tPD tON
0.5 0.5 0.1 0.9 40
1 1 1 2 60
s s ns ns ns
100 30 40 ns 60 8 pC
Turn-Off Time Charge Injection
tOFF Q
VCOM_ = 1.5V, RS = 0, CL = 1nF, Figure 3
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3.5/7 Quad SPST Switches with Over-Rail Signal Handling MAX4851/MAX4851H/MAX4853/MAX4853H
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 Off-Isolation (Note 6) Crosstalk Total Harmonic Distortion DIGITAL I/O (IN_) Input Logic High Voltage Input Logic Low Voltage Input Leakage Current COMPARATOR Comparator Range Comparator Threshold Comparator Hysteresis Comparator Output High Voltage Comparator Output Low Voltage Comparator Switching Time VTH VCC = 2V to 5.5V, falling input VCC = 2V to 5.5V ISOURCE = 1mA ISINK = 1mA Rising input, Figure 6 Falling input, Figure 6 2.5 0.5 VCC 0.4V 0.4 0 0.3 x VCC 0.33 x VCC 50 5.5 0.36 x VCC V V mV V V s 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 THD SYMBOL CONDITIONS f = 100kHz, VCOM_= 1VRMS, RL = 50, CL = 5pF, Figure 4 f = 1MHz, VCOM_= 1VRMS, RL = 50, CL = 5pF, Figure 4 f = 20Hz to 20kHz, VCOM_ = 1V + 2VP-P, RL = 600 MIN TYP -80 -95 0.04 MAX UNITS dB dB %
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.
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Quad SPST Switches with Over-Rail Signal Handling
Typical Operating Characteristics
(VCC = 3.0V, TA = +25C, unless otherwise noted.)
MAX4851/MAX4853 ON-RESISTANCE vs. COM VOLTAGE
MAX4851/3 toc01
MAX4851/MAX4851H/MAX4853/MAX4853H
MAX4851/MAX4853 ON-RESISTANCE vs. COM VOLTAGE
MAX4851/3 toc02
MAX4851/MAX4853 ON-RESISTANCE vs. COM VOLTAGE
VCC = 5.0V 3.5 SWITCH TA = +85C 2.5 TA = +25C 2.0 1.5 1.0 0.5 TA = -40C
MAX4851/3 toc03
10 9 8 ON-RESISTANCE () 7 6 5 4 3 2 1 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 3.5 SWITCH
4.5 4.0 ON-RESISTANCE () 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 2 4 TA = -40C
VCC = 3.0V 3.5 SWITCH TA = +85C TA = +25C
3.5 3.0 ON-RESISTANCE ()
6
0
2
4
6
COM VOLTAGE (V)
COM VOLTAGE (V)
MAX4851H/MAX4853H ON-RESISTANCE vs. COM VOLTAGE
MAX4851/3 toc04
MAX4851H/MAX4853H ON-RESISTANCE vs. COM VOLTAGE
MAX4851/3 toc05
MAX4851H/MAX4853H ON-RESISTANCE vs. COM VOLTAGE
VCC = 5.0V 3.5 SWITCH TA = +85C TA = +25C
MAX4850 toc06
10 9 8 ON-RESISTANCE () 7 6 5 4 3 2 1 0 0 2 4 VCC = 1.8V VCC = 2.0V VCC = 2.3V VCC = 2.5V VCC = 3.0V
3.5 SWITCH
5.0 4.5 ON-RESISTANCE () 4.0 3.5 3.0 2.5 2.0 1.5 1.0 TA = -40C TA = +25C TA = +85C VCC = 3.0V 3.5 SWITCH
3.5 3.0 ON-RESISTANCE () 2.5 2.0 1.5 1.0 0.5 TA = -40C
VCC = 5.0V
6
0
0.5
1.0
1.5
2.0
2.5
3.0
0
1
2
3
4
5
COM VOLTAGE (V)
COM VOLTAGE (V)
COM VOLTAGE (V)
MAX4853 ON-RESISTANCE vs. COM VOLTAGE
MAX4851/3 toc07
MAX4853 ON-RESISTANCE vs. COM VOLTAGE
MAX4851/3 toc08
MAX4853 ON-RESISTANCE vs. COM VOLTAGE
5.0 ON-RESISTANCE () 4.5 4.0 3.5 3.0 2.5 TA = +25C TA = +85C VCC = 5.0V 7 SWITCH
MAX4851/3 toc09
45 7 SWITCH 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 7 ON-RESISTANCE () 6 5 4 3 2 0 2 4 6 COM VOLTAGE (V) TA = +25C TA = -40C VCC = 3.0V 7 SWITCH TA = +85C
5.5
2.0 1.5 0 1 2 3
TA = -40C 4 5 6
COM VOLTAGE (V)
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3.5/7 Quad SPST Switches with Over-Rail Signal Handling MAX4851/MAX4851H/MAX4853/MAX4853H
Typical Operating Characteristics (continued)
(VCC = 3.0V, TA = +25C, unless otherwise noted.)
MAX4853H ON-RESISTANCE vs. COM VOLTAGE
MAX4851/3 toc10
MAX4853H ON-RESISTANCE vs. COM VOLTAGE
MAX4851/3 toc11
MAX4853H ON-RESISTANCE vs. COM VOLTAGE
5.0 ON-RESISTANCE () 4.5 4.0 3.5 3.0 2.5 2.0 1.5 0 TA = -40C 1 2 3 4 5 TA = +25C TA = +85C VCC = 5.0V 7 SWITCH
MAX4851/3 toc12
45 7 SWITCH 40 35 ON-RESISTANCE () 30 25 20 15 10 5 0 0 2 4 6 COM VOLTAGE (V) VCC = 2.3V VCC = 2.5V VCC = 3.0V VCC = 5.0V VCC = 2.0V VCC = 1.8V
8 7 ON-RESISTANCE () 6 5
5.5
VCC = 3.0V 7 SWITCH TA = +85C
TA = +25C 4 TA = -40C 3 2 0 0.5 1.0 1.5 2.0 2.5 3.0 COM VOLTAGE (V)
COM VOLTAGE (V)
MAX4851 SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4851/3 toc13
MAX4851H SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4851/3 toc14
MAX4853 SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4851/3 toc15
5.5 5.0 SUPPLY CURRENT (A) 4.5 4.0 3.5 3.0 TA = -40C 2.5 2.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 TA = +25C
8 7 SUPPLY CURRENT (A) 6 5 4 3 2 TA = +25C TA = +85C
1.0
0.8 SUPPLY CURRENT (nA) TA = +85C 0.6
TA = +85C
0.4
TA = -40C
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 3.5 4.0 4.5 5.0 5.5 1.5 2.0 2.5 3.0 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V)
5.5
SUPPLY VOLTAGE (V)
MAX4853H SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4851/3 toc16
TURN-ON/TURN-OFF TIME vs. SUPPLY VOLTAGE
MAX4851/3 toc17
TURN-ON/TURN-OFF TIME vs. TEMPERATURE
3.5 SWITCH TURN-ON/TURN-OFF TIME (ns) 32 30 28 26 tOFF 24 22 20 tON
MAX4851/3 toc18
8.0 7.5 SUPPLY CURRENT (A) 7.0 6.5 6.0 5.5 5.0 4.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 TA = +25C TA = -40C TA = +85C
60 3.5 SWITCH TURN-ON/TURN-OFF TIME (ns) 50 40 tON 30 20 tOFF 10 0
34
5.5
1.5
2.5
3.5
4.5
5.5
-40
-15
10
35
60
85
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
6
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Quad SPST Switches with Over-Rail Signal Handling
Typical Operating Characteristics (continued)
(VCC = 3.0V, TA = +25C, unless otherwise noted.)
TURN-ON/TURN-OFF TIME vs. SUPPLY VOLTAGE
MAX4851/3 toc19
MAX4851/MAX4851H/MAX4853/MAX4853H
TURN-ON/TURN-OFF TIME vs. TEMPERATURE
MAX4851/3 toc20
LOGIC THRESHOLD vs. SUPPLY VOLTAGE
MAX4851/3 toc21
60 50 40 tON 30 20 tOFF 10 0 1.5 2.5 3.5
7 SWITCH
34 7 SWITCH TURN-ON/TURN-OFF TIME (ns) 32 tON 30 28 26 tOFF 24 22 20
1.6
TURN-ON/TURN-OFF TIME (ns)
1.4 LOGIC THRESHOLD (V) VIN RISING 1.2
1.0 VIN FALLING 0.8
0.6 -40 -15 10 35 60 85 1.5 2.5 3.5 4.5 5.5 TEMPERATURE (C) SUPPLY VOLTAGE (V)
4.5
5.5
SUPPLY VOLTAGE (V)
CHARGE INJECTION vs. COM VOLTAGE
MAX4851/3 toc22
CHARGE INJECTION vs. COM VOLTAGE
MAX4851/3 toc23
LEAKAGE CURRENT vs. TEMPERATURE
3.5 SWITCH
MAX4851/3 toc24 MAX4851/3 toc27
30 3.5 SWITCH
30 7 SWITCH
1.4 1.2 LEAKAGE CURRENT (nA) 1.0 0.8 0.6 0.4 0.2 0
CHARGE INJECTION (pC)
CHARGE INJECTION (pC)
20 VCC = 3V
20 VCC = 3V
COM ON-LEAKAGE
COM OFF-LEAKAGE
10
10 VCC = 5V 0
VCC = 5V 0 0 1 2 3 4 5 COM VOLTAGE (V) 0 1 2 3
4
5
-40
-15
10
35
60
85
COM VOLTAGE (V)
TEMPERATURE (C)
LEAKAGE CURRENT vs. TEMPERATURE
MAX4851/3 toc25
FREQUENCY RESPONSE
MAX4851/3 toc26
FREQUENCY RESPONSE
20 0 -20 -40 -60 -80 -100 CROSSTALK ON-RESPONSE 7 SWITCH
1.6 7 SWITCH 1.4 LEAKAGE CURRENT (nA) 1.2 1.0 0.8 0.6 0.4 0.2 0 -40 -15 10 35 60 COM OFF-LEAKAGE COM ON-LEAKAGE
20 0 -20 -40 -60 -80 -100
3.5 SWITCH
FREQUENCY RESPONSE (dB)
ON-RESPONSE
FREQUENCY RESPONSE (dB)
OFF-RESPONSE
OFF-RESPONSE
CROSSTALK
85
0.1
1
10 FREQUENCY (MHz)
100
1000
0.1
1
10 FREQUENCY (MHz)
100
1000
TEMPERATURE (C)
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3.5/7 Quad SPST Switches with Over-Rail Signal Handling MAX4851/MAX4851H/MAX4853/MAX4853H
Typical Operating Characteristics (continued)
(VCC = 3.0V, TA = +25C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION vs. FREQUENCY
MAX4851/3 toc28
TOTAL HARMONIC DISTORTION vs. FREQUENCY
7 SWITCH RL = 600
MAX4851/3 toc29
1
3.5 SWITCH RL = 600
1
THD (%)
0.1
THD (%) 10 100 1k FREQUENCY (Hz) 10k 100k
0.1
0.01
0.01 10 100 1k FREQUENCY (Hz) 10k 100k
(MAX4851/MAX4851H) COMPARATOR THRESHOLD vs. TEMPERATURE
MAX4851/3 toc30
COMPARATOR THRESHOLD vs. TEMPERATURE
VCC = 5.0V COMPARATOR THRESHOLD (V) 1.725 1.700 1.675 1.650 1.625 1.600 -40 -15 10 35 60 85 TEMPERATURE (C) VCMPI_ FALLING VCMPI_ RISING
MAX4851/3 toc31
MAX4851/3 toc33
1.10 VCC = 3.0V COMPARATOR THRESHOLD (V) 1.08 VCMPI_ RISING 1.06
1.750
1.04 VCMPI_ FALLING
1.02
1.00 -40 -15 10 35 60 85 TEMPERATURE (C)
MAX4851/MAX4853 SWITCH PASSING SIGNALS ABOVE SUPPLY VOLTAGE
MAX4851/3 toc32
MAX4851H/MAX4853H SWITCH ENTERING HIGH-IMPEDANCE STATE
VCC = 3.0V VNC 2V/div 0V
VCC = 3.0V VNC 2V/div 0V
VCOM 0V 200s/div
VCOM 0V
HI-Z STATE
HI-Z STATE
200s/div
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Quad SPST Switches with Over-Rail Signal Handling
Pin Description
PIN MAX4851 MAX4851H 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 -- EP MAX4853 MAX4853H 1 -- 3 4 5 6 7 8 9 10 -- 12 13 14 15 16 2, 11 EP NO1 CIN IN2 COM2 NO2 GND NO3 COM3 IN3 NO4 COUT COM4 IN4 VCC IN1 COM1 N.C. GND Normally Open Terminal for Analog Switch 1 Inverting Input for Comparator 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 Output for Comparator 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 No Connection. Not internally connected. Exposed Pad. Connect to ground. NAME FUNCTION
MAX4851/MAX4851H/MAX4853/MAX4853H MAX4851/MAX4851H/MAX4853/MAX4853H
Detailed Description
The MAX4851/MAX4851H/MAX4853/MAX4853H are low on-resistance, low-voltage, analog switches that operate from a +2V to +5.5V single supply and are fully specified for nominal 3.0V applications. The MAX4851/MAX4853 devices feature over-rail signal capability that allows signals up to 5.5V with supply voltages down to 2.0V to pass through without distortion. The MAX4851H/ MAX4853H enter high-impedance mode when the signal voltage exceeds VCC and return to normal operation when the signal voltage drops below VCC.
These quad SPST switches have low on-channel capacitance, which allows switching of the data signals for USB 2.0/1.1 applications (12Mbps). They are 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. The MAX4851_ features a comparator that can be used for headphone or mute detection. The comparator threshold is internally generated to be approximately 1/3 of VCC.
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3.5/7 Quad SPST Switches with Over-Rail Signal Handling MAX4851/MAX4851H/MAX4853/MAX4853H
Test Circuits/Timing Diagrams
MAX4851_ MAX4853_
VNO NO_
VCC V CC 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
CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL VOUT = VNO RL + RON
SWITCH INPUT
VCC
VCC + 0.5V tHIZB tHIZ NORMAL MODE HIGH-Z MODE NORMAL MODE
(
)
IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
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
Figure 2. Input/Output Skew Timing Diagram 10 ______________________________________________________________________________________
Quad SPST Switches with Over-Rail Signal Handling
Test Circuits/Timing Diagrams (continued)
MAX4851/MAX4851H/MAX4853/MAX4853H
V CC
MAX4851_ MAX4853_
RGEN NO_ V GEN
VOUT VCC COM_ CL GND IN_ IN OFF ON Q = (V OUT )(C L ) OFF VOUT VOUT
VIL TO VIH
Figure 3. Charge Injection
+5V 10nF OFF-ISOLATION = 20log NETWORK ANALYZER VCC 0V OR VCC IN_ COM1 VIN 50 50
VOUT VIN
V ON-LOSS = 20log OUT VIN CROSSTALK = 20log VOUT VIN
MAX4851_ MAX4853_
GND
NO1*
VOUT
MEAS
REF
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
______________________________________________________________________________________
11
3.5/7 Quad SPST Switches with Over-Rail Signal Handling MAX4851/MAX4851H/MAX4853/MAX4853H
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).
10nF V CC
VCC COM_
MAX4851_ MAX4853_
IN VIL OR VIH
CAPACITANCE METER NO_ f = 1MHz GND
Analog Signal Levels
The on-resistance of these switches changes very little for analog input signals across the entire supply voltage range (see Typical Operating Characteristics). The switches are bidirectional; therefore, NO_ and COM_ can be either inputs or outputs.
Figure 5. Channel Off-/On-Capacitance
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.
Comparator
The positive terminal of the comparator is internally set to V CC / 3. When the negative comparator terminal (CIN) is below the threshold (VCC / 3), the comparator output (COUT) goes high. When CIN rises above VCC / 3, COUT goes low. The comparator threshold allows for detection of headphones since headphone audio signals are typically biased to VCC / 2.
MAX4851_
VCC NO_ VCC 3 VCC COUT_ VCIN_ CIN_ GND VTH = VCC/3 COMPARATOR INPUT (VCIN_) VTH - 100mV VCOUT_ COMPARATOR OUTPUT (VCOUT_) 0V VOUT tCOMP
50%
VTH + 100mV
50%
tR < 20ns tF < 20ns
50%
tCOMP
50%
Figure 6. Comparator Switching Time
Selector Guide
PART MAX4851 MAX4851H MAX4853 MAX4853H RON () NO1/NO3 3.5 3.5 3.5 3.5 NO2/NO4 3.5 3.5 7 7 COMPARATORS 1 1 -- -- OVER-RAIL HANDLING Input signal passes through the switch. High-impedance switch input. Input signal passes through the switch. High-impedance switch input.
12
______________________________________________________________________________________
Quad SPST Switches with Over-Rail Signal Handling
Pin Configurations
COM1 VCC VCC IN1 IN4 IN1 IN4
MAX4851/MAX4851H/MAX4853/MAX4853H
TOP VIEW
16
15
14
13
16
COM1
15
14
13
NO1 CIN IN2 COM2
1 2 3 4 5 NO2 6 GND 7 NO3 8 COM3
12 COM4 11 COUT
NO1 N.C. IN2 COM2
1 2 3 4 5 NO2 6 GND 7 NO3 8 COM3
12 COM4 11 N.C.
MAX4851 MAX4851H
10 NO4 9 IN3
MAX4853 MAX4853H
10 NO4 9 IN3
3mm x 3mm THIN QFN
CONNECT EXPOSED PAD TO PC BOARD GROUND.
3mm x 3mm THIN QFN
Typical Operating Circuit
TRANSISTOR COUNT: 735 PROCESS: CMOS
MAX4851_
D+ DATA SOURCE (USB) DNO1 3.5 NO2 3.5 OUT+ AUDIO SOURCE MUTE OUTNO4 3.5 VCC 3 COUT CIN MUTE BUTTON NO3 3.5 COM1 IN1 COM2 IN2 COM3 IN3 COM4 IN4 VCC SPEAKER ENABLE USB CONNECTOR D+
Chip Information
DUSB DATA ENABLE
______________________________________________________________________________________
13
3.5/7 Quad SPST Switches with Over-Rail Signal Handling MAX4851/MAX4851H/MAX4853/MAX4853H
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
0.10 M C A B
D D/2
D2/2
E/2
E2/2
C L
E
(NE - 1) X e
E2
L e k (ND - 1) X e
C L
C L
0.10 C 0.08 C A A2 A1 L
C L
L
e
e
PACKAGE OUTLINE 12, 16L, THIN QFN, 3x3x0.8mm
21-0136
E
1 2
EXPOSED PAD VARIATIONS
DOWN BONDS ALLOWED
NOTES: 1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994. 2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES. 3. N IS THE TOTAL NUMBER OF TERMINALS. 4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE. 5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.20 mm AND 0.25 mm FROM TERMINAL TIP. 6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY. 7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION. 8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS. 9. DRAWING CONFORMS TO JEDEC MO220 REVISION C.
PACKAGE OUTLINE 12, 16L, THIN QFN, 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.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
12x16L QFN THIN.EPS

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