MAXIM MAX4851ETE

19-3471; Rev 0; 10/04
3.5Ω/7Ω Quad SPST Switches with Over-Rail
Signal Handling
The MAX4851/MAX4851H/MAX4853/MAX4853H are
available in the space-saving, 16-pin, 3mm x 3mm thin
QFN package and operate over the -40°C to +85°C
extended temperature range.
Features
♦ USB 2.0 Full Speed (12Mbps) and USB 1.1 Signal
Switching
♦ Switch Signals Greater than VCC
♦ +2V to +5.5V Supply Range
♦ 3.5Ω/7Ω On-Resistance
♦ 30pF On-Capacitance (7Ω Switch)
♦ 150MHz -3dB Bandwidth
♦ 1.8V Logic Compatibility
♦ Low Supply Current
0.01µA (MAX4853)
5µA (MAX4851)
10µA (MAX4851H/MAX4853H)
♦ Low 0.01nA Leakage Current
♦ Available in a Space-Saving 3mm x 3mm, 16-Pin
TQFN Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
-40°C to +85°C 16 TQFN-EP*
MAX4851ETE
Applications
USB Switching
TOP
MARK
ABW
MAX4851HETE -40°C to +85°C 16 TQFN-EP*
ABX
-40°C to +85°C 16 TQFN-EP*
ACB
MAX4853HETE -40°C to +85°C 16 TQFN-EP*
ACC
MAX4853ETE
*EP = Exposed paddle.
Audio Signal Routing
Block Diagram/Truth Table
Cellular Phones
Notebook Computers
PDAs and Other Handheld Devices
MAX4851
MAX4851H
MAX4853
MAX4853H
COM1
NO1
3.5Ω
NO2
3.5Ω
3.5Ω
COM2
TRUTH TABLE
IN2
IN_
0
1
COM3
NO3
3.5Ω
IN3
COM4
NO4
3.5Ω
IN4
COM1
NO1
IN1
NO_
OFF
ON
COM2
NO2
7Ω
IN2
COM3
NO3
3.5Ω
SWITCHES SHOWN
FOR LOGIC "0" INPUT
IN1
IN3
COM4
NO4
7Ω
IN4
VCC
3
Pin Configurations and Typical Operating Circuit appear at
end of data sheet
COUT
CIN
________________________________________________________________ Maxim Integrated Products
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.
1
MAX4851/MAX4851H/MAX4853/MAX4853H
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 3.5Ω on-resistance with 40pF on-capacitance
or 7Ω 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.
MAX4851/MAX4851H/MAX4853/MAX4853H
3.5Ω/7Ω Quad SPST Switches with Over-Rail
Signal Handling
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_
3.5Ω Switch ................................................................±100mA
7Ω Switch .....................................................................±50mA
Peak Current COM_, NO_ (pulsed at 1ms, 50% duty cycle)
3.5Ω Switch ................................................................±200mA
7Ω Switch ...................................................................±100mA
Peak Current COM_, NO_ (pulsed at 1ms, 10% duty cycle)
3.5Ω Switch ................................................................±240mA
7Ω Switch ...................................................................±120mA
Continuous Power Dissipation (TA = +70°C)
16-Pin Thin QFN (derate 20.8mW/°C above +70°C) ...1667mW
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: 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 = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.0V, TA = +25°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
Supply Voltage
VCC
Supply Current
ICC
CONDITIONS
MIN
TYP
2.0
VCC = 5.5V, VIN_
= 0 or VCC
MAX
UNITS
5.5
V
MAX4851
5
10
MAX4851H/MAX4853H
10
20
0.01
1
MAX4853
µA
ANALOG SWITCH (3.5Ω Switch)
Analog Signal Range
On-Resistance
VNO_,
VCOM_
RON
0
VCC = 3V, ICOM_ =
10mA, VNO_ = 0 to
5.5V (MAX485_) or
VCC (MAX485_H)
TA = +25°C
VCC = 3V; ICOM =
10mA; VNO_ = 1.5V
TA = +25°C
RFLAT
VCC = 3V, ICOM_ =
10mA, VNO_ = 1V,
2V, 3V
TA = +25°C
On-Resistance Flatness (Note 5)
COM_ On-Leakage Current
-3dB Bandwidth
2
ION
BW
4.5
5
0.1
TA = -40°C to +85°C
TA = +25°C
0.2
0.25
1.2
TA = -40°C to +85°C
VCC = 5.5V, VNO_
TA = +25°C
= 1V or 4.5V,
VCOM_ = 4.5V or 1V TA = -40°C to +85°C
VCC = 5.5V; VNO_
= 1V, 4.5V, or
floating; VCOM_ =
1V, 4.5V, or floating
V
Ω
∆RON
IOFF
3.5
TA = -40°C to +85°C
On-Resistance Match Between
Channels (Notes 3, 4)
NO_ Off-Leakage Current
5.5
1.8
Ω
Ω
2
-2
+2
-10
+10
-2
+2
-12.5
+12.5
nA
nA
TA = -40°C to +85°C
Signal = 0dBm, RL = 50Ω, CL = 5pF, Figure 4
135
_______________________________________________________________________________________
MHz
Quad SPST Switches with Over-Rail Signal
Handling
(VCC = +2.7V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.0V, TA = +25°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
NO_ Off-Capacitance
COFF
f = 1MHz, Figure 5
20
pF
COM On-Capacitance
CON
f = 1MHz, Figure 5
40
pF
ANALOG SWITCH (7Ω Switch)
Analog Signal Range
On-Resistance
VNO_,
VCOM_
RON
0
VCC = 3V, ICOM_ =
10mA, VNO_ = 0 to
5.5V (MAX485_), or
VCC (MAX485_H)
TA = +25°C
VCC = 3V, ICOM =
10mA, VNO_ = 1.5V
TA = +25°C
RFLAT
VCC = 3V; ICOM_ =
10mA; VNO_ = 1V,
2V, 3V
TA = +25°C
On-Resistance Flatness (Note 5)
COM_ On-Leakage Current
-3dB Bandwidth
ION
BW
9
10
0.2
TA = -40°C to +85°C
TA = +25°C
0.4
0.5
2.5
TA = -40°C to +85°C
VCC = 5.5V, VNO_
TA = +25°C
= 1V or 4.5V,
VCOM_ = 4.5V or 1V TA = -40°C to +85°C
VCC = 5.5V; VNO_
= 1V, 4.5V, or
floating; VCOM_ =
1V, 4.5V, or floating
V
Ω
∆RON
IOFF
7
TA = -40°C to +85°C
On-Resistance Match Between
Channels (Notes 3, 4)
NO_ Off-Leakage Current
5.5
3.75
Ω
Ω
4.0
-2
+2
-10
+10
-2
+2
- 12.5
+12.5
nA
nA
TA = -40°C to +85°C
Signal = 0dBm, RL = 50Ω, CL = 5pF, Figure 4
150
MHz
NO_ Off-Capacitance
COFF
f = 1MHz, Figure 5
13
pF
COM On-Capacitance
CON
f = 1MHz, Figure 5
30
pF
Signal Over-Rail to HighImpedance Switching Time
tHIZ
MAX4851H/MAX4853H, VNO_ = VCC to
(VCC + 0.5V), VCC < 5V, Figure 1
0.5
1
µs
High-Impedance to
Low-Impedance Switching Time
tHIZB
MAX4851H/MAX4853H, VNO_ = (VCC +
0.5V) to VCC, VCC < 5V, Figure 1
0.5
1
µs
Skew (Note 3)
DYNAMIC CHARACTERISTICS
tSKEW
RS = 39Ω, CL = 50pF, Figure 2
0.1
1
ns
Propagation Delay (Note 3)
tPD
RS = 39Ω, CL = 50pF, Figure 2
0.9
2
ns
60
tON
VCC = 3V, VNO_ =
1.5V, RL = 300Ω, CL
= 50pF, Figure 1
40
Turn-On Time
Turn-Off Time
Charge Injection
tOFF
Q
VCC = 3V, VNO_ =
1.5V, RL = 300Ω, CL
= 50pF, Figure 1
TA = +25°C
ns
TA = -40°C to +85°C
TA = +25°C
100
30
40
ns
TA = -40°C to +85°C
VCOM_ = 1.5V, RS = 0Ω, CL = 1nF, Figure 3
60
8
pC
_______________________________________________________________________________________
3
MAX4851/MAX4851H/MAX4853/MAX4853H
ELECTRICAL CHARACTERISTICS (continued)
MAX4851/MAX4851H/MAX4853/MAX4853H
3.5Ω/7Ω Quad SPST Switches with Over-Rail
Signal Handling
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.7V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.0V, TA = +25°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Off-Isolation (Note 6)
f = 100kHz, VCOM_= 1VRMS, RL = 50Ω,
CL = 5pF, Figure 4
-80
dB
Crosstalk
f = 1MHz, VCOM_= 1VRMS, RL = 50Ω,
CL = 5pF, Figure 4
-95
dB
f = 20Hz to 20kHz, VCOM_ = 1V + 2VP-P,
RL = 600Ω
0.04
%
Total Harmonic Distortion
THD
DIGITAL I/O (IN_)
Input Logic High Voltage
VIH
Input Logic Low Voltage
VIL
Input Leakage Current
IIN
VCC = 2V to 3.6V
1.4
VCC = 3.6V to 5.5V
1.8
V
VCC = 2V to 3.6V
0.5
VCC = 3.6V to 5.5V
0.8
VIN_ = 0 or 5.5V
-0.5
VCC = 2V to 5.5V, falling input
0.3 x
VCC
V
+0.5
µA
5.5
V
0.36 x
VCC
V
COMPARATOR
Comparator Range
Comparator Threshold
Comparator Hysteresis
0
VTH
VCC = 2V to 5.5V
Comparator Output High Voltage
ISOURCE = 1mA
Comparator Output Low Voltage
ISINK = 1mA
Comparator Switching Time
0.33 x
VCC
50
mV
VCC 0.4V
V
0.4
Rising input, Figure 6
2.5
Falling input, Figure 6
0.5
V
µs
Note 2: Specifications are 100% tested at TA = +85°C 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.
4
_______________________________________________________________________________________
Quad SPST Switches with Over-Rail Signal
Handling
7
6
VCC = 2.3V
5
VCC = 2.5V
4
VCC = 3.0V
3
VCC = 5.0V
TA = +25°C
2.5
2.0
0
2
4
1.0
4
6
4.5
4.0
TA = +25°C
3.5
3.0
2.5
2.0
2
TA = -40°C
0
6
4
0
0.5
1.0
1.5
2.0
2.5
0
3.0
1
2
3
5
4
MAX4853
ON-RESISTANCE vs. COM VOLTAGE
MAX4853
ON-RESISTANCE vs. COM VOLTAGE
VCC = 2.0V
VCC = 2.3V
6
5
4
TA = +25°C
3
TA = -40°C
4
4.0
TA = +25°C
3.5
3.0
2.0
2
0
2
TA = +85°C
4.5
2.5
VCC = 2.5V
VCC = 3.0V VCC = 5.0V
COM VOLTAGE (V)
VCC = 5.0V
7Ω SWITCH
5.0
ON-RESISTANCE (Ω)
TA = +85°C
ON-RESISTANCE (Ω)
25
VCC = 3.0V
7Ω SWITCH
7
5.5
MAX4851/3 toc08
8
MAX4851/3 toc07
30
MAX4851/3 toc03
TA = -40°C
MAX4853
ON-RESISTANCE vs. COM VOLTAGE
VCC = 1.8V
0
1.5
COM VOLTAGE (V)
40
5
2.0
COM VOLTAGE (V)
7Ω SWITCH
10
TA = +25°C
COM VOLTAGE (V)
45
15
2.5
0.5
1.0
2
TA = +85°C
1.0
1.5
1
VCC = 5.0V
3.5Ω SWITCH
3.0
ON-RESISTANCE (Ω)
VCC = 5.0V
VCC = 3.0V
3.5Ω SWITCH
TA = +85°C
3.5
MAX4851/3 toc05
5.0
MAX4851/3 toc04
3.5Ω SWITCH
VCC = 3.0V
3
20
6
MAX4851H/MAX4853H
ON-RESISTANCE vs. COM VOLTAGE
VCC = 2.5V
35
4
MAX4851H/MAX4853H
ON-RESISTANCE vs. COM VOLTAGE
4
0
2
0
MAX4851H/MAX4853H
ON-RESISTANCE vs. COM VOLTAGE
VCC = 2.3V
5
0.5
2
0
ON-RESISTANCE (Ω)
6
TA = -40°C
COM VOLTAGE (V)
VCC = 2.0V
7
1.5
COM VOLTAGE (V)
VCC = 1.8V
8
TA = +25°C
2.0
COM VOLTAGE (V)
10
9
6
TA = +85°C
2.5
TA = -40°C
0.5
0
VCC = 5.0V
3.5Ω SWITCH
3.0
1.0
1
ON-RESISTANCE (Ω)
3.0
1.5
2
ON-RESISTANCE (Ω)
TA = +85°C
3.5
3.5
MAX4850 toc06
VCC = 2.0V
4.0
ON-RESISTANCE (Ω)
ON-RESISTANCE (Ω)
8
VCC = 3.0V
3.5Ω SWITCH
MAX4851/3 toc09
3.5Ω SWITCH
ON-RESISTANCE (Ω)
9
4.5
MAX4851/3 toc01
10
VCC = 1.8V
MAX4851/MAX4853
ON-RESISTANCE vs. COM VOLTAGE
MAX4851/MAX4853
ON-RESISTANCE vs. COM VOLTAGE
MAX4851/3 toc02
MAX4851/MAX4853
ON-RESISTANCE vs. COM VOLTAGE
6
TA = -40°C
1.5
0
2
4
COM VOLTAGE (V)
6
0
1
2
3
4
5
6
COM VOLTAGE (V)
_______________________________________________________________________________________
5
MAX4851/MAX4851H/MAX4853/MAX4853H
Typical Operating Characteristics
(VCC = 3.0V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VCC = 3.0V, TA = +25°C, unless otherwise noted.)
20
VCC = 2.3V
VCC = 2.5V
VCC = 3.0V
10
TA = +25°C
4
2
6
4
4.0
TA = +25°C
3.5
3.0
2.0
TA = -40°C
1.5
2
0
TA = +85°C
4.5
2.5
3
0
0
0.5
1.0
1.5
2.0
2.5
0
3.0
1
2
3
5
4
COM VOLTAGE (V)
COM VOLTAGE (V)
COM VOLTAGE (V)
MAX4851
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4851H
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4853
SUPPLY CURRENT vs. SUPPLY VOLTAGE
4.0
3.5
3.0
TA = -40°C
6
5
4
TA = +25°C
TA = -40°C
2.0
2
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
MAX4851/3 toc15
0.4
TA = +25°C
TA = -40°C
0
1.5
5.5
TA = +85°C
0.6
0.2
3
TA = +25°C
2.5
TA = +85°C
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
1.5
2.0
2.5
3.0
3.5
4.0
4.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
MAX4853H
SUPPLY CURRENT vs. SUPPLY VOLTAGE
TURN-ON/TURN-OFF TIME
vs. SUPPLY VOLTAGE
TURN-ON/TURN-OFF TIME
vs. TEMPERATURE
7.0
TA = +85°C
6.5
6.0
5.5
5.0
TA = +25°C
3.5Ω SWITCH
50
40
tON
30
20
tOFF
10
TA = -40°C
4.5
2.0
2.5
3.0
3.5
4.0
SUPPLY VOLTAGE (V)
4.5
5.0
5.5
3.5Ω SWITCH
32
30
5.5
tON
28
26
tOFF
24
22
0
1.5
34
TURN-ON/TURN-OFF TIME (ns)
7.5
60
TURN-ON/TURN-OFF TIME (ns)
MAX4851/3 toc16
8.0
5.0
MAX4851/3 toc18
TA = +85°C
0.8
SUPPLY CURRENT (nA)
4.5
7
SUPPLY CURRENT (µA)
5.0
1.0
MAX4851/3 toc14
8
MAX4851/3 toc13
5.5
SUPPLY CURRENT (µA)
5
TA = -40°C
VCC = 5.0V
5
6
6
VCC = 5.0V
7Ω SWITCH
5.0
ON-RESISTANCE (Ω)
VCC = 2.0V
15
TA = +85°C
MAX4851/3 toc17
ON-RESISTANCE (Ω)
30
VCC = 3.0V
7Ω SWITCH
7
ON-RESISTANCE (Ω)
VCC = 1.8V
5.5
MAX4851/3 toc11
7Ω SWITCH
40
25
8
MAX4851/3 toc10
45
35
MAX4853H
ON-RESISTANCE vs. COM VOLTAGE
MAX4853H
ON-RESISTANCE vs. COM VOLTAGE
MAX4851/3 toc12
MAX4853H
ON-RESISTANCE vs. COM VOLTAGE
SUPPLY CURRENT (µA)
MAX4851/MAX4851H/MAX4853/MAX4853H
3.5Ω/7Ω Quad SPST Switches with Over-Rail
Signal Handling
20
1.5
2.5
3.5
SUPPLY VOLTAGE (V)
4.5
5.5
-40
-15
10
35
TEMPERATURE (°C)
_______________________________________________________________________________________
60
85
Quad SPST Switches with Over-Rail Signal
Handling
40
tON
30
20
tOFF
10
tON
30
28
26
tOFF
24
VIN RISING
1.2
1.0
VIN FALLING
0.8
20
0.6
-40
-15
10
SUPPLY VOLTAGE (V)
35
60
85
1.5
CHARGE INJECTION vs. COM VOLTAGE
CHARGE INJECTION vs. COM VOLTAGE
7Ω SWITCH
CHARGE INJECTION (pC)
3.5Ω SWITCH
20
VCC = 3V
10
1.4
VCC = 3V
10
4
5
1
2
COM VOLTAGE (V)
LEAKAGE CURRENT vs. TEMPERATURE
COM OFF-LEAKAGE
0.6
0.4
20
FREQUENCY RESPONSE (dB)
COM ON-LEAKAGE
1.0
3
0
10
35
TEMPERATURE (°C)
0.4
-40
-15
10
-40
60
85
85
60
FREQUENCY RESPONSE
0
ON-RESPONSE
-20
35
TEMPERATURE (°C)
OFF-RESPONSE
-60
CROSSTALK
20
7Ω SWITCH
0
ON-RESPONSE
-20
-40
OFF-RESPONSE
-60
CROSSTALK
-80
-100
-100
-15
COM OFF-LEAKAGE
0.6
5
4
3.5Ω SWITCH
-80
0.2
-40
0.8
FREQUENCY RESPONSE
MAX4851/3 toc25
7Ω SWITCH
1.4
0.8
COM ON-LEAKAGE
COM VOLTAGE (V)
1.6
1.2
1.0
0
0
FREQUENCY RESPONSE (dB)
3
MAX4851/3 toc26
2
3.5Ω SWITCH
0.2
0
1
5.5
1.2
VCC = 5V
0
4.5
LEAKAGE CURRENT vs. TEMPERATURE
20
VCC = 5V
3.5
SUPPLY VOLTAGE (V)
30
MAX4851/3 toc22
30
0
2.5
TEMPERATURE (°C)
MAX4851/3 toc24
5.5
MAX4851/3 toc27
4.5
LEAKAGE CURRENT (nA)
3.5
MAX4851/3 toc23
2.5
1.5
CHARGE INJECTION (pC)
1.4
22
0
LEAKAGE CURRENT (nA)
MAX4851/3 toc21
7Ω SWITCH
32
LOGIC THRESHOLD (V)
50
1.6
MAX4851/3 toc20
7Ω SWITCH
LOGIC THRESHOLD vs. SUPPLY VOLTAGE
34
TURN-ON/TURN-OFF TIME (ns)
TURN-ON/TURN-OFF TIME (ns)
60
TURN-ON/TURN-OFF TIME
vs. TEMPERATURE
MAX4851/3 toc19
TURN-ON/TURN-OFF TIME
vs. SUPPLY VOLTAGE
0.1
1
10
FREQUENCY (MHz)
100
1000
0.1
1
10
100
1000
FREQUENCY (MHz)
_______________________________________________________________________________________
7
MAX4851/MAX4851H/MAX4853/MAX4853H
Typical Operating Characteristics (continued)
(VCC = 3.0V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VCC = 3.0V, TA = +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
1
MAX4851/3 toc28
3.5Ω SWITCH
RL = 600Ω
0.1
0.01
10
100
1k
10k
7Ω SWITCH
RL = 600Ω
0.1
0.01
100k
10
100
1k
10k
FREQUENCY (Hz)
FREQUENCY (Hz)
(MAX4851/MAX4851H) COMPARATOR
THRESHOLD vs. TEMPERATURE
COMPARATOR THRESHOLD
vs. TEMPERATURE
1.08
VCMPI_ RISING
1.06
1.04
VCMPI_ FALLING
1.02
1.750
VCC = 5.0V
VCMPI_ RISING
1.725
1.700
VCMPI_ FALLING
1.675
1.650
1.625
1.00
-40
-15
10
35
60
85
1.600
-40
-15
10
35
60
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX4851/MAX4853
SWITCH PASSING SIGNALS
ABOVE SUPPLY VOLTAGE
MAX4851H/MAX4853H
SWITCH ENTERING
HIGH-IMPEDANCE STATE
MAX4851/3 toc32
VCC = 3.0V
VNC
2V/div
VNC
2V/div
0V
0V
VCOM
VCOM
0V
0V
200µs/div
85
MAX4851/3 toc33
VCC = 3.0V
8
100k
MAX4851/3 toc31
VCC = 3.0V
COMPARATOR THRESHOLD (V)
MAX4851/3 toc30
1.10
MAX4851/3 toc29
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
THD (%)
THD (%)
1
COMPARATOR THRESHOLD (V)
MAX4851/MAX4851H/MAX4853/MAX4853H
3.5Ω/7Ω Quad SPST Switches with Over-Rail
Signal Handling
HI-Z
STATE
HI-Z
STATE
200µs/div
_______________________________________________________________________________________
Quad SPST Switches with Over-Rail Signal
Handling
PIN
MAX4851
MAX4851H
NAME
FUNCTION
MAX4853
MAX4853H
1
1
NO1
Normally Open Terminal for Analog Switch 1
2
—
CIN
Inverting Input for Comparator
3
3
IN2
Digital Control Input for Analog Switch 2. A logic-low on IN2 disconnects COM2 from
NO2 and a logic-high connects COM2 to NO2.
4
4
COM2
5
5
NO2
Normally Open Terminal for Analog Switch 2
6
6
GND
Ground
7
7
NO3
Normally Open Terminal for Analog Switch 3
8
8
COM3
9
9
IN3
Digital Control Input for Analog Switch 3. A logic-low on IN3 disconnects COM3 from
NO3 and a logic-high connects COM3 to NO3.
10
10
NO4
Normally Open Terminal for Analog Switch 4
11
—
COUT
12
12
COM4
Common Terminal for Analog Switch 2
Common Terminal for Analog Switch 3
Output for Comparator
Common Terminal for Analog Switch 4
13
13
IN4
Digital Control Input for Analog Switch 4. A logic-low on IN4 disconnects COM4 from
NO4 and a logic-high connects COM4 to NO4.
14
14
VCC
Supply Voltage. Bypass to GND with a 0.01µF capacitor as close to the pin as
possible.
15
15
IN1
Digital Control Input for Analog Switch 1. A logic-low on IN1 disconnects COM1 from
NO1 and a logic-high connects COM1 to NO1.
16
16
COM1
—
2, 11
N.C.
No Connection. Not internally connected.
EP
EP
GND
Exposed Pad. Connect to ground.
Common Terminal for Analog Switch 1
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.
_______________________________________________________________________________________
9
MAX4851/MAX4851H/MAX4853/MAX4853H
Pin Description
MAX4851/MAX4851H/MAX4853/MAX4853H
3.5Ω/7Ω Quad SPST Switches with Over-Rail
Signal Handling
Test Circuits/Timing Diagrams
MAX4851_
MAX4853_
VCC
LOGIC
INPUT
V CC
COM_
NO_
VNO
t R < 20ns
t F < 20ns
VCC
50%
0V
VOUT
RL
t OFF
SWITCH
OUTPUT
CL
VOUT
0.9 x V0UT
0.9 x VOUT
0V
IN_
t ON
GND
LOGIC
INPUT
SWITCH
INPUT
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
RL
VOUT = VNO
RL + RON
(
VCC + 0.5V
VCC
tHIZB
)
HIGH-Z MODE
tHIZ
NORMAL MODE
NORMAL MODE
IN DEPENDS ON SWITCH CONFIGURATION;
INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
Figure 1. Switching Time
tri
90%
50%
A
TxD+
B
INPUT A
10%
tskew_i
CL
Rs
INPUT A-
90%
50%
10%
tfi
tro
A-
TxDRs
Rs = 39Ω
CL = 50pF
B-
OUTPUT B
10%
90%
50%
tskew_o
CL
OUTPUT B-
90%
50%
10%
tfo
Figure 2. Input/Output Skew Timing Diagram
10
______________________________________________________________________________________
Quad SPST Switches with Over-Rail Signal
Handling
V CC
MAX4851_
MAX4853_
∆VOUT
VCC
RGEN
VOUT
COM_
VOUT
NO_
CL
V GEN
GND
IN_
OFF
IN
VIL TO VIH
ON
OFF
Q = (∆V OUT )(C L )
Figure 3. Charge Injection
+5V 10nF
OFF-ISOLATION = 20log
NETWORK
ANALYZER
VCC
0V OR VCC
COM1
IN_
MAX4851_
MAX4853_
50Ω
VIN
V
ON-LOSS = 20log OUT
VIN
50Ω
CROSSTALK = 20log
NO1*
GND
VOUT
MEAS
50Ω
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.
VOUT
VIN
REF
VOUT
VIN
50Ω
*FOR CROSSTALK, THIS PIN IS NO2.
COM2 IS OPEN.
Figure 4. On-Loss, Off-Isolation, and Crosstalk
______________________________________________________________________________________
11
MAX4851/MAX4851H/MAX4853/MAX4853H
Test Circuits/Timing Diagrams (continued)
MAX4851/MAX4851H/MAX4853/MAX4853H
3.5Ω/7Ω Quad SPST Switches with Over-Rail
Signal Handling
Applications Information
10nF
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).
VCC
COM_
IN
GND
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.
tR < 20ns
tF < 20ns
MAX4851_
VTH + 100mV
VCC
50%
50%
VTH - 100mV
COUT_
CIN_
VCIN_
COMPARATOR
INPUT (VCIN_)
VCC
GND
VIL OR VIH
NO_
f = 1MHz
Analog Signal Levels
VCC
3
MAX4851_
MAX4853_
CAPACITANCE
METER
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.
NO_
V CC
VOUT
VCOUT_
COMPARATOR
OUTPUT (VCOUT_)
tCOMP
tCOMP
50%
50%
0V
VTH = VCC/3
Figure 6. Comparator Switching Time
Selector Guide
PART
RON (Ω)
NO1/NO3
NO2/NO4
3.5
3.5
MAX4851H
3.5
MAX4853
3.5
MAX4853H
3.5
MAX4851
12
COMPARATORS
OVER-RAIL HANDLING
1
Input signal passes through the switch.
3.5
1
High-impedance switch input.
7
—
Input signal passes through the switch.
7
—
High-impedance switch input.
______________________________________________________________________________________
Quad SPST Switches with Over-Rail Signal
Handling
4
COM1
IN1
VCC
IN4
COM1
IN1
VCC
IN4
13
MAX4851
MAX4851H
12 COM4
NO1
1
11 COUT
N.C.
2
10 NO4
9
5
6
7
8
IN3
3mm x 3mm THIN QFN
IN2
3
COM2
4
12 COM4
11 N.C.
MAX4853
MAX4853H
10 NO4
9
5
6
7
IN3
8
COM3
COM2
14
NO3
3
15
GND
IN2
16
NO2
2
13
COM3
CIN
14
NO3
1
15
GND
NO1
16
NO2
TOP VIEW
3mm x 3mm THIN QFN
CONNECT EXPOSED PAD TO PC BOARD GROUND.
Chip Information
Typical Operating Circuit
TRANSISTOR COUNT: 735
PROCESS: CMOS
MAX4851_
NO1
D+
DATA SOURCE
(USB)
D-
COM2
MUTE
D-
IN2
3.5Ω
OUT+
D+
IN1
3.5Ω
NO2
AUDIO
SOURCE
USB
CONNECTOR
COM1
USB DATA
ENABLE
COM3
NO3
IN3
3.5Ω
OUT-
COM4
NO4
IN4
3.5Ω
VCC
3
VCC
SPEAKER
ENABLE
COUT
CIN
MUTE
BUTTON
______________________________________________________________________________________
13
MAX4851/MAX4851H/MAX4853/MAX4853H
Pin Configurations
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.)
12x16L QFN THIN.EPS
MAX4851/MAX4851H/MAX4853/MAX4853H
3.5Ω/7Ω Quad SPST Switches with Over-Rail
Signal Handling
D2
0.10 M C A B
b
D
D2/2
D/2
E/2
E2/2
CL
(NE - 1) X e
E
E2
L
k
e
CL
(ND - 1) X e
CL
0.10 C
CL
0.08 C
A
A2
A1
L
L
e
e
PACKAGE OUTLINE
12, 16L, THIN QFN, 3x3x0.8mm
E
21-0136
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
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implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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