19-3375; Rev 0; 7/04
Dual SPDT Analog Switches with
Over-Rail Signal Handling
The MAX4850/MAX4850H/MAX4852/MAX4852H family
of dual SPDT (single-pole/double-throw) switches operate from a single +2V to +5.5V supply and can handle
signals greater than the supply rail. These switches feature low 3.5Ω or 3.5Ω/7Ω on-resistance with low oncapacitance, making them ideal for switching audio
and data signals.
The MAX4850/MAX4850H are configured with two
SPDT switches and feature two comparators for headphone detection or mute/send key functions. The
MAX4852 has two SPDT switches with no comparators
for low 1µA supply current.
For over-rail applications, these devices offer either the
pass-through or high-impedance option. For the
MAX4850/MAX4852, the signal (up to 5.5V) passes
through the switch without distortion even when the positive supply rail is exceeded. For the MAX4850H/
MAX4852H, the switch input becomes high impedance
when the input signal exceeds the supply rail.
The MAX4850/MAX4850H/MAX4852/MAX4852H are
available in the space-saving (3mm x 3mm), 16-pin
TQFN package and operate over the extended temperature range of -40°C to +85°C.
Features
♦ USB 2.0 Full Speed (12MB) and USB 1.1 Signal
Switching Compliant
♦ Switch Signals Greater than VCC
♦ 0.1ns Differential Skew
♦ 3.5Ω/7Ω On-Resistance
♦ 135MHz -3dB Bandwidth
♦ +2V to +5.5V Supply Range
♦ 1.8V Logic Compatible
♦ Low Supply Current
1µA (MAX4852)
5µA (MAX4850)
10µA (MAX4850H/MAX4852H)
♦ Available in a Space-Saving (3mm x 3mm),
16-Pin TQFN Package
Ordering Information
PART
Applications
TEMP RANGE
PIN-PACKAGE
TOP
MARK
MAX4850ETE
-40°C to +85°C
16 TQFN-EP*
ABU
USB Switching
MAX4850HETE
-40°C to +85°C
16 TQFN-EP*
ABV
Audio-Signal Routing
MAX4852ETE
-40°C to +85°C
16 TQFN-EP*
ABZ
MAX4852HETE -40°C to +85°C
*EP = Exposed paddle.
16 TQFN-EP*
ACA
Cellular Phones
Notebook Computers
Pin Configurations and Selector Guide appear at end of
data sheet.
PDAs and Other Handheld Devices
Block Diagrams/Truth Table
NC1
MAX4850
MAX4850H
MAX4850_
MAX4852_
MAX4852
MAX4852H
NC1
3.5Ω
COM1
3.5Ω
NO1
IN1
NC2
IN2
COM1
NO1
7Ω
IN_
NO_
0
OFF
NC_
ON
1
ON
OFF
IN1
SWITCHES SHOWN FOR
3.5Ω
NO2
7Ω
LOGIC 0 INPUT
COM2
3.5Ω
NO2
NC2
IN2
COM2
VCC
3
COUT1
CIN1
VCC
3
COUT2
CIN2
________________________________________________________________ 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
MAX4850/MAX4850H/MAX4852/MAX4852H
General Description
MAX4850/MAX4850H/MAX4852/MAX4852H
Dual SPDT Analog Switches with
Over-Rail Signal Handling
ABSOLUTE MAXIMUM RATINGS
VCC, IN_, CIN_, COM_, NO_,
NC_ 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_, NC_ (pulsed at 1ms, 50% duty cycle)
3.5Ω Switch ................................................................±200mA
7Ω Switch ...................................................................±100mA
Note 1:
Peak Current COM_, NO_, NC_ (pulsed at 1ms, 10% duty cycle)
3.5Ω Switch ................................................................±240mA
7Ω Switch ...................................................................±120mA
Continuous Power Dissipation (TA = +70°C)
16-Pin TQFN (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
Signals on IN, NO, NC, 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
CONDITIONS
MIN
VCC
Supply Current
ICC
TYP
2.0
VCC = 5.5V, VIN_ = 0V or VCC
MAX
UNITS
5.5
V
MAX4850
5
10
MAX4850H/
MAX4852H
10
20
MAX4852
µA
1
ANALOG SWITCH (3.5Ω Switch)
Analog Signal Range
On-Resistance (Note 3)
VNO_, VNC_,
VCOM_
RON
0
VCC = 3V, ICOM_ = 10mA,
VNC_ or VNO_ = 0 to 5.5V
(MAX485_) or VCC (MAX485_H)
TA = +25°C
5.5
3.5
TA = -40°C
to +85°C
4.5
5
TA = +25°C
0.1
V
Ω
0.2
On-Resistance Match
Between Channels
(Notes 3, 4)
ΔRON
VCC = 3V, ICOM = 10mA,
VNC_ or VNO_ = 1.5V
On-Resistance Flatness
(Note 5)
RFLAT
VCC = 3V, ICOM_ = 10mA,
VNC_ or VNO_ = 1V, 2V, 3V
NO_/NC_ Off-Leakage
Current
IOFF
VCC = 5.5V, VNC_ or VNO_ = 1V
or 4.5V, VCOM_ = 4.5V or 1V
COM_ On-Leakage Current
ION
VCC = 5.5V; VNC_ or VNO_ = 1V,
4.5V, or floating;
VCOM_ = 1V, 4.5V, or floating
-3dB Bandwidth
BW
Signal = 0dBm, RL = 50Ω, CL = 5pF (Figure 5)
100
MHz
f = 1MHz (Figure 6)
20
pF
NO_/NC_ Off-Capacitance
2
COFF
TA = -40°C
to +85°C
0.25
TA = +25°C
1.2
TA = -40°C
to +85°C
1.8
2
TA = +25°C
-2
+2
TA = -40°C
to +85°C
-10
+10
TA = +25°C
-2
+2
TA = -40°C
to +85°C
-12.5
+12.5
_______________________________________________________________________________________
Ω
Ω
nA
nA
Dual SPDT Analog 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
COM On-Capacitance
CON
CONDITIONS
MIN
f = 1MHz (Figure 6)
TYP
MAX
60
UNITS
pF
ANALOG SWITCH (7Ω Switch)
Analog Signal Range
VNO_, VNC_,
VCOM_
On-Resistance
RON
On-Resistance Match
Between Channels
(Notes 3, 4)
0
VCC = 3V, ICOM_ = 10mA, VNC_
or VNO_ = 0 to 5.5V (MAX4852)
or VCC (MAX4852H)
TA = +25°C
5.5
7
TA = -40°C
to +85°C
9
10
TA = +25°C
0.2
V
Ω
0.4
ΔRON
VCC = 3V, ICOM = 10mA, VNC_ or
VNO_ = 1.5V
RFLAT
VCC = 3V, ICOM_ = 10mA, VNC_
or VNO_ = 1V, 2V, 3V
IOFF
VCC = 5.5V, VNC_ or VNO_ = 1V
or 4.5V, VCOM_ = 4.5V or 1V
COM_ On-Leakage Current
ION
VCC = 5.5V; VNC_ or VNO_ = 1V,
4.5V, or floating; VCOM_ = 1V,
4.5V, or floating
-3dB Bandwidth
BW
Signal = 0dBm, RL = 50Ω, CL = 5pF (Figure 5)
135
MHz
On-Resistance Flatness
(Note 5)
NO_/NC_ Off-Leakage
Current
TA = -40°C
to +85°C
0.5
TA = +25°C
2.5
TA = -40°C
to +85°C
Ω
3.75
4.0
TA = +25°C
-2
+2
TA = -40°C
to +85°C
-10
+10
TA = +25°C
-2
+2
TA = -40°C
to +85°C
-12.5
+12.5
Ω
nA
nA
NO_/NC_ Off-Capacitance
COFF
f = 1MHz (Figure 6)
12
pF
COM On-Capacitance
CON
f = 1MHz (Figure 6)
50
pF
Signal Over-Rail to High-Z
Switching Time
tHIZ
MAX4850H/MAX4852H, VNO_ or VNC_ = VCC to
(VCC + 0.5V), VCC < 5V (Figure 1)
0.5
1
µs
High-Z to Low-Z Switching
Time
tHIZB
MAX4850H/MAX4852H, VNO_ or VNC_ =
(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
40
60
Turn-On Time
tON
VCC = 3V, VNO_ or VNC_ = 1.5V,
RL = 300Ω, CL = 50pF (Figure 1)
Turn-Off Time
tOFF
VCC = 3V, VNO_ or VNC_ = 1.5V,
RL = 300Ω, CL = 50pF (Figure 1)
TA = +25°C
TA = -40°C
to +85°C
TA = +25°C
TA = -40°C
to +85°C
100
30
ns
40
60
ns
_______________________________________________________________________________________
3
MAX4850/MAX4850H/MAX4852/MAX4852H
ELECTRICAL CHARACTERISTICS (continued)
MAX4850/MAX4850H/MAX4852/MAX4852H
Dual SPDT Analog 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
TA = +25°C
Break-Before-Make Time
Delay (Note 3)
tD
VCC = 3V, VNO_ or VNC_ = 1.5V,
RL = 300Ω, CL = 50pF (Figure 3)
Charge Injection
Q
VCOM_ = 1.5V, RS = 0Ω, CL = 1nF (Figure 4)
TA = -40°C
to +85°C
TYP
MAX
UNITS
15
ns
2
8
pC
-80
dB
Off-Isolation (Note 6)
VISO
f = 100kHz, VCOM_= 1VRMS, RL = 50Ω,
CL = 5pF (Figure 5)
Crosstalk
VCT
f = 1MHz, VCOM_ = 1VRMS, RL = 50Ω, CL = 5pF
(Figure 5)
-95
dB
Total Harmonic Distortion
THD
f = 20Hz to 20kHz, VCOM_ = 1V + 2VP-P,
RL = 600Ω
0.04
%
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
V
-0.5
+0.5
µA
0
5.5
V
0.36 x
VCC
V
COMPARATOR
Comparator Range
Comparator Threshold
Comparator Hysteresis
VTH
VCC = 2V to 5.5V, falling input
VCC = 2V to 5.5V
Comparator Output High
Voltage
ISOURCE = 1mA
Comparator Output Low
Voltage
ISINK = 1mA
Comparator Switching Time
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
4
0.3 x
VCC
0.33 x
VCC
50
mV
VCC 0.4V
V
0.4
Rising input (Figure 7)
2.5
Falling input (Figure 7)
0.5
V
µs
Specifications are 100% tested at TA = +85°C only, and guaranteed by design and characterization over the specified
temperature range.
Guaranteed by design and characterization; not production tested.
ΔRON = RON(MAX) - RON(MIN).
Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the
specified analog signal ranges.
Off-isolation = 20log10 (VCOM_ / VNO_), VCOM_ = output, VNO_ = input to off switch.
_______________________________________________________________________________________
Dual SPDT Analog Switches with
Over-Rail Signal Handling
VCC = 2.3V
5
VCC = 2.5V
4
VCC = 3.0V
3
VCC = 5.0V
0
TA = +25°C
2.5
2.0
2
1.0
6
4
0
MAX4850H/MAX4852H
ON-RESISTANCE vs. COM VOLTAGE
VCC = 5.0V
TA = +85°C
4.0
TA = +25°C
3.5
3.0
2.5
2.0
2
TA = -40°C
2
4
0.5
1.0
1.5
2.0
2.5
3.0
1
0
2
3
4
5
MAX4852
ON-RESISTANCE vs. COM VOLTAGE
MAX4852
ON-RESISTANCE vs. COM VOLTAGE
VCC = 2.3V
ON-RESISTANCE (Ω)
VCC = 2.0V
6
5
4
TA = +25°C
3
TA = -40°C
0
4
4.0
TA = +25°C
3.5
3.0
2.0
2
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
TA = +85°C
ON-RESISTANCE (Ω)
25
VCC = 3.0V
7Ω SWITCH
7
5.5
MAX4850 toc08
8
MAX4850 toc07
30
0
TA = -40°C
MAX4852
ON-RESISTANCE vs. COM VOLTAGE
VCC = 1.8V
5
1.5
COM VOLTAGE (V)
7Ω SWITCH
10
2.0
COM VOLTAGE (V)
40
15
TA = +25°C
COM VOLTAGE (V)
45
20
2.5
0.5
0
6
TA = +85°C
1.0
1.0
0
VCC = 5.0V
3.5Ω SWITCH
3.0
1.5
1
MAX4850 toc03
3.5
MAX4850 toc05
4.5
VCC = 3.0V
3.5Ω SWITCH
ON-RESISTANCE (Ω)
VCC = 3.0V
3
5.0
MAX4850 toc04
3.5Ω SWITCH
VCC = 2.5V
35
6
4
MAX4850H/MAX4852H
ON-RESISTANCE vs. COM VOLTAGE
4
0
2
MAX4850H/MAX4852H
ON-RESISTANCE vs. COM VOLTAGE
VCC = 2.3V
5
2
COM VOLTAGE (V)
ON-RESISTANCE (Ω)
6
TA = -40°C
0.5
0
VCC = 2.0V
7
1.5
COM VOLTAGE (V)
VCC = 1.8V
8
TA = +25°C
2.0
COM VOLTAGE (V)
10
9
6
4
TA = +85°C
2.5
TA = -40°C
0.5
0
ON-RESISTANCE (Ω)
3.0
1.0
1
ON-RESISTANCE (Ω)
TA = +85°C
3.5
1.5
2
VCC = 5.0V
3.5Ω SWITCH
3.0
MAX4850 toc06
6
3.5
MAX4850 toc09
VCC = 2.0V
7
4.0
ON-RESISTANCE (Ω)
ON-RESISTANCE (Ω)
8
VCC = 3.0V
3.5Ω SWITCH
ON-RESISTANCE (Ω)
3.5Ω SWITCH
VCC = 1.8V
4.5
MAX4850 toc01
10
9
MAX4850/MAX4852
ON-RESISTANCE vs. COM VOLTAGE
MAX4850/MAX4852
ON-RESISTANCE vs. COM VOLTAGE
MAX4850 toc02
MAX4850/MAX4852
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
MAX4850/MAX4850H/MAX4852/MAX4852H
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.)
MAX4852H
ON-RESISTANCE vs. COM VOLTAGE
VCC = 1.8V
7
5.5
25
VCC = 2.0V
20
VCC = 2.3V
15
6
5
TA = +25°C
4
VCC = 5.0V
3
2
2
0.5
1.0
1.5
2.0
3.0
2.5
0
1
2
10
MAX4850 toc13
7
TA = -40°C
5
4
TA = +85°C
TA = +25°C
9
SUPPLY CURRENT (μA)
6
3
4
5
COM VOLTAGE (V)
MAX4850H
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4850
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY CURRENT (μA)
TA = -40°C
COM VOLTAGE (V)
COM VOLTAGE (V)
3
3.0
1.5
0
6
4
TA = +25°C
3.5
MAX4850 toc14
0
4.0
2.0
5
0
TA = +85°C
4.5
2.5
TA = -40°C
VCC = 2.5V
VCC = 3.0V
10
ON-RESISTANCE (Ω)
30
VCC = 5.0V
7Ω SWITCH
5.0
TA = +85°C
ON-RESISTANCE (Ω)
ON-RESISTANCE (Ω)
VCC = 3.0V
7Ω SWITCH
MAX4850 toc12
7Ω SWITCH
40
35
8
MAX4850 toc10
45
MAX4852H
ON-RESISTANCE vs. COM VOLTAGE
MAX4850 toc11
MAX4852H
ON-RESISTANCE vs. COM VOLTAGE
TA = -40°C
8
7
6
5
TA = +85°C
TA = +25°C
4
3
2
2
3.5
1.5
5.5
4.5
2.5
2.0
TA = +85°C
1.5
1.0
TA = -40°C
6.0
5.5
5.0
4.5
TA = +85°C
4.0
TA = +25°C
TA = -40°C
MAX4850 toc16
6.5
SUPPLY CURRENT (μA)
2.5
0.5
TA = +25°C
2.5
3.5
SUPPLY VOLTAGE (V)
4.5
5.5
TURN-ON/TURN-OFF TIME
vs. SUPPLY VOLTAGE
60
3.5Ω SWITCH
50
40
tON
30
20
tOFF
0
3.0
1.5
5.5
10
3.5
0
6
7.0
MAX4850 toc15
3.0
4.5
MAX4852H
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4852
SUPPLY CURRENT vs. SUPPLY VOLTAGE
3.5
3.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
MAX4850 toc17
2.5
TURN-ON/TURN-OFF TIME (ns)
1.5
SUPPLY CURRENT (nA)
MAX4850/MAX4850H/MAX4852/MAX4852H
Dual SPDT Analog Switches with
Over-Rail Signal Handling
1.5
2.5
3.5
SUPPLY VOLTAGE (V)
4.5
5.5
1.5
2.5
3.5
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
4.5
5.5
Dual SPDT Analog Switches with
Over-Rail Signal Handling
TURN-ON/TURN-OFF TIME
vs. SUPPLY VOLTAGE
tON
28
26
tOFF
24
7Ω SWITCH
40
tON
30
20
tOFF
10
35
2.5
LOGIC THRESHOLD vs. SUPPLY VOLTAGE
3.5
-40
-15
1.2
1.0
VIN FALLING
0.8
30
VCC = 3V
20
VCC = 5V
1
2
SUPPLY VOLTAGE (V)
7Ω SWITCH
VCC = 3V
30
VCC = 5V
20
10
3
5
4
0
1
COM VOLTAGE (V)
LEAKAGE CURRENT vs. TEMPERATURE
3
4
5
LEAKAGE CURRENT vs. TEMPERATURE
0.8
COM OFF-LEAKAGE
0.4
0.2
MAX4850 toc25
7Ω SWITCH
1.4
LEAKAGE CURRENT (nA)
COM ON-LEAKAGE
0.6
2
COM VOLTAGE (V)
1.6
MAX4850 toc24
3.5Ω SWITCH
1.2
1.0
85
0
0
1.4
60
CHARGE INJECTION vs. COM VOLTAGE
0
5.5
4.5
35
40
10
0.6
10
TEMPERATURE (°C)
3.5Ω SWITCH
VIN RISING
LEAKAGE CURRENT (nA)
tOFF
24
CHARGE INJECTION vs. COM VOLTAGE
CHARGE INJECTION (pC)
1.4
3.5
26
5.5
4.5
40
MAX4850 toc21
1.6
2.5
28
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
1.5
tON
30
20
1.5
85
60
CHARGE INJECTION (pC)
-15
MAX4850 toc22
-40
32
22
0
20
MAX4850 toc20
50
10
22
LOGIC THRESHOLD (V)
34
MAX4850 toc23
30
7Ω SWITCH
TURN-ON/TURN-OFF TIME (ns)
32
60
TURN-ON/TURN-OFF TIME (ns)
TURN-ON/TURN-OFF TIME (ns)
3.5Ω SWITCH
MAX4850 toc18
34
TURN-ON/TURN-OFF TIME
vs. TEMPERATURE
MAX4850 toc19
TURN-ON/TURN-OFF TIME
vs. TEMPERATURE
1.2
COM ON-LEAKAGE
1.0
0.8
COM OFF-LEAKAGE
0.6
0.4
0.2
0
0
-40
-15
10
35
TEMPERATURE (°C)
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
_______________________________________________________________________________________
7
MAX4850/MAX4850H/MAX4852/MAX4852H
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.)
0
-20
-40
OFF-RESPONSE
-60
CROSSTALK
-80
7Ω SWITCH
0
-20
-40
OFF-RESPONSE
-60
CROSSTALK
-80
-100
1
10
100
1000
0.1
1
10
100
FREQUENCY (MHz)
FREQUENCY (MHz)
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
1
1
THD (%)
3.5Ω SWITCH
RL = 600Ω
MAX4850 toc28
0.1
0.1
0.01
7Ω SWITCH
RL = 600Ω
1000
MAX4850 toc29
-100
0.1
0.01
10
100
1k
FREQUENCY (Hz)
8
ON-RESPONSE
MAX4850 toc27
3.5Ω SWITCH
20
FREQUENCY RESPONSE (dB)
FREQUENCY RESPONSE (dB)
ON-RESPONSE
FREQUENCY RESPONSE
MAX4850 toc26
FREQUENCY RESPONSE
20
THD (%)
MAX4850/MAX4850H/MAX4852/MAX4852H
Dual SPDT Analog Switches with
Over-Rail Signal Handling
10k
100k
10
100
1k
10k
FREQUENCY (Hz)
_______________________________________________________________________________________
100k
Dual SPDT Analog Switches with
Over-Rail Signal Handling
COMPARATOR THRESHOLD
vs. TEMPERATURE
COMPARATOR THRESHOLD
vs. TEMPERATURE
1.08
VCMPI_ RISING
1.06
1.04
VCMPI_ FALLING
1.02
1.750
MAX4850 toc31
COMPARATOR THRESHOLD (V)
VCC = 3.0V
VCC = 5.0V
COMPARATOR THRESHOLD (V)
MAX4850 toc30
1.10
VCMPI_ RISING
1.725
1.700
VCMPI_ FALLING
1.675
1.650
1.625
1.600
1.00
-40
-15
10
35
60
-40
85
-15
10
35
60
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX4850/MAX4852
SWITCH PASSING SIGNALS
ABOVE SUPPLY VOLTAGE
MAX4850H/MAX4852H
SWITCH ENTERING
HIGH-IMPEDANCE STATE
MAX4850 toc32
MAX4850 toc33
VCC = 3.0V
VCC = 3.0V
VNC
2V/div
VNC
2V/div
0V
0V
VCOM
VCOM
0V
0V
200μs/div
85
HI-Z
STATE
HI-Z
STATE
200μs/div
_______________________________________________________________________________________
9
MAX4850/MAX4850H/MAX4852/MAX4852H
Typical Operating Characteristics (continued)
(VCC = 3.0V, TA = +25°C, unless otherwise noted.)
MAX4850/MAX4850H/MAX4852/MAX4852H
Dual SPDT Analog Switches with
Over-Rail Signal Handling
Pin Descriptions
MAX4850/MAX4850H
PIN
NAME
FUNCTION
1, 8
N.C.
No Connection. Not internally connected.
2
CIN1
Inverting Input for Comparator 1
3
CIN2
Inverting Input for Comparator 2
4
COM1
5
NO1
Normally Open Terminal for Analog Switch 1
6
GND
Ground
7
NC2
Normally Closed Terminal for Analog Switch 2
9
IN2
Digital Control Input for Analog Switch 2. A logic LOW on IN2 connects COM2 to NC2 and a logic
HIGH connects COM2 to NO2.
Common Terminal for Analog Switch 1
10
COM2
Common Terminal for Analog Switch 2
11
COUT1
Output for Comparator 1
12
NO2
13
COUT2
Normally Open Terminal for Analog Switch 2
14
VCC
Supply Voltage. Bypass to GND with a 0.01µF capacitor as close to the pin as possible.
15
IN1
Digital Control Input for Analog Switch 1. A logic LOW on IN1 connects COM1 to NC1 and a logic
HIGH connects COM1 to NO1.
16
NC1
Normally Closed Terminal for Analog Switch 1
EP
—
Output for Comparator 2
Exposed Paddle. Connect to PC board ground plane.
MAX4852/MAX4852H
PIN
NAME
FUNCTION
1, 2, 3, 8, 11, 13
N.C.
4
COM1
5
NO1
Normally Open Terminal for Analog Switch 1
6
GND
Ground
7
NC2
Normally Closed Terminal for Analog Switch 2
9
IN2
Digital Control Input for Analog Switch 2. A logic LOW on IN2 connects COM2 to NC2 and a logic
HIGH connects COM2 to NO2.
10
COM2
12
NO2
14
VCC
Supply Voltage. Bypass to GND with a 0.01µF capacitor as close to the pin as possible.
15
IN1
Digital Control Input for Analog Switch 1. A logic LOW on IN1 connects COM1 to NC1 and a logic
HIGH connects COM1 to NO1.
16
NC1
EP
—
10
No Connection. Not internally connected.
Common Terminal for Analog Switch 1
Common Terminal for Analog Switch 2
Normally Open Terminal for Analog Switch 2
Normally Closed Terminal for Analog Switch 1
Exposed Paddle. Connect to PC board ground plane.
______________________________________________________________________________________
Dual SPDT Analog Switches with
Over-Rail Signal Handling
The MAX4850/MAX4850H/MAX4852/MAX4852H 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. These devices feature
over-rail signal capability that allows signals up to 5.5V
with supply voltages down to 2.0V. These devices are
configured as dual SPDT switches.
These switches have low 50pF on-channel capacitance,
which allows for 12Mbps switching of the data signals for
USB 2.0 full speed/1.1 applications. The MAX485_ _ are
designed to switch D+ and D- USB signals with a guaranteed skew of less than 1ns (see Figure 1), as measured
from 50% of the input signal to 50% of the output signal.
The MAX4850_ feature a comparator that can be used
for headphone or mute detection. The comparator
threshold is internally generated to be approximately 1/3
of VCC.
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 con-
sumption. 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).
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, so NO_, NC_, and COM_
can be either inputs or outputs.
Comparator
The positive terminal of the comparator is internally set to
VCC/3. When the negative 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.
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.
______________________________________________________________________________________
11
MAX4850/MAX4850H/MAX4852/MAX4852H
Detailed Description
MAX4850/MAX4850H/MAX4852/MAX4852H
Dual SPDT Analog Switches with
Over-Rail Signal Handling
Test Circuits/Timing Diagrams
MAX4850_
MAX4852_
VCC
LOGIC
INPUT
V CC
VNO
COM_
NO_
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
tHIZB
)
tHIZ
HIGH-Z MODE
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
Rs
INPUT A
10%
tskew_i
CL
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
|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
12
______________________________________________________________________________________
Dual SPDT Analog Switches with
Over-Rail Signal Handling
LOGIC
INPUT
V CC
VCC
50%
0V
NC_
VN_
MAX4850/MAX4850H/MAX4852/MAX4852H
V CC
MAX4850_
MAX4852_
VOUT
COM_
NO_
RL
CL
IN_
LOGIC
INPUT
GND
0.9 x VOUT
VOUT
tBBM
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
Figure 3. Break-Before-Make Interval
V CC
MAX4850_
MAX4852_
ΔVOUT
VCC
RGEN
VOUT
COM_
NC_
OR NO_
VOUT
IN
OFF
CL
V GEN
GND
OFF
ON
IN_
VIL TO VIH
OFF
IN
ON
OFF
Q = (ΔV OUT )(C L )
LOGIC-INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
Figure 4. Charge Injection
+5V 10nF
V
OFF-ISOLATION = 20log OUT
VIN
NETWORK
ANALYZER
VCC
0V OR VCC
NC1
50Ω
COM1
IN_
MAX4850_
MAX4852_
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_ OR NC_ TERMINAL ON EACH SWITCH.
ON-LOSS IS MEASURED BETWEEN COM_ AND "ON", NO_ OR NC_ TERMINAL ON EACH SWITCH.
CROSSTALK IS MEASURED FROM ONE CHANNEL TO THE OTHER CHANNEL.
SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
REF
VOUT
VIN
50Ω
*FOR CROSSTALK THIS PIN IS NO2.
NC2 AND COM2 ARE OPEN.
Figure 5. On-Loss, Off-Isolation, and Crosstalk
______________________________________________________________________________________
13
MAX4850/MAX4850H/MAX4852/MAX4852H
Dual SPDT Analog Switches with
Over-Rail Signal Handling
10nF
V CC
VCC
COM_
MAX4850_
MAX4852_
IN
CAPACITANCE
METER
VIL OR VIH
NC_ OR
NO_
f = 1MHz
GND
Figure 6. Channel Off-/On-Capacitance
tR < 20ns
tF < 20ns
MAX4850_
VTH + 100mV
VCC
NO_
VCC
3
50%
50%
VTH - 100mV
COUT_
VCIN_
COMPARATOR
INPUT (VCIN_)
VCC
CIN_
GND
VTH = VCC/3
VOUT
VCOUT_
COMPARATOR
OUTPUT (VCOUT_)
tCOMP
tCOMP
50%
0V
Figure 7. Comparator Switching Time
14
______________________________________________________________________________________
50%
Dual SPDT Analog Switches with
Over-Rail Signal Handling
4
IN1
VCC
COUT2
NC1
IN1
VCC
N.C.
14
13
MAX4850
MAX4850H
12 NO2
N.C.
1
11 COUT1
N.C.
2
10 COM2
9
NO1
5
IN2
N.C.
3
COM1
4
12 NO2
11 N.C.
MAX4852
MAX4852H
10 COM2
9
6
7
8
5
THIN QFN
6
7
IN2
8
N.C.
COM1
15
NC2
3
16
GND
CIN2
13
NO1
2
14
N.C.
CIN1
15
NC2
1
16
GND
N.C.
NC1
TOP VIEW
THIN QFN
CONNECT EXPOSED PADDLE TO GROUND.
Typical Operating Circuit
Selector Guide
PART
RON
NC_/NO_ COMPARATORS
(Ω)
OVER-RAIL
HANDLING
MAX4850
3.5/3.5
2
Input signal
passes through
the switch
MAX4850H
3.5/3.5
2
High-impedance
switch input
MAX4852
3.5/7
—
Input signal
passes through
the switch
MAX4852H
3.5/7
—
High-impedance
switch input
OUT+ NC1
DATA
SOURCE
MAX4850_
OUT-
COM1
NO1
IN1
NC2
IN2
COM2
OUT+
AUDIO
SOURCE
OUT-
NO2
MUTE
Chip Information
TRANSISTOR COUNT: 735
PROCESS: CMOS
INPUT
SELECT
VCC
VCC
3
COUT
CIN
MUTE
BUTTON
______________________________________________________________________________________
15
MAX4850/MAX4850H/MAX4852/MAX4852H
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.)
(NE - 1) X e
E
MARKING
12x16L QFN THIN.EPS
MAX4850/MAX4850H/MAX4852/MAX4852H
Dual SPDT Analog Switches with
Over-Rail Signal Handling
E/2
D2/2
(ND - 1) X e
AAAA
D/2
e
CL
D
D2
k
b
CL
0.10 M C A B
E2/2
L
E2
0.10 C
C
L
0.08 C
C
L
A
A2
A1
L
L
e
e
PACKAGE OUTLINE
8, 12, 16L THIN QFN, 3x3x0.8mm
21-0136
PKG
8L 3x3
12L 3x3
16L 3x3
REF.
MIN. NOM. MAX.
MIN. NOM. MAX.
MIN. NOM. MAX.
A
0.70
0.75
0.80
0.70
0.75
0.80
0.70
0.75
0.80
b
0.25
0.30
0.35
0.20
0.25
0.30
0.20
0.25
0.30
D
2.90
3.00
3.10
2.90
3.00
3.10
2.90
3.00
3.10
E
2.90
3.00
3.10
2.90
3.00
3.10
2.90
3.00
3.10
e
L
0.65 BSC.
0.35
0.55
0.75
0.45
0.55
0.65
0.30
0.40
N
8
12
16
ND
2
3
4
2
NE
A1
0
A2
k
0.02
0
0.25
-
0.02
0.05
0
0.25
-
0.02
-
0.25
-
PKG.
CODES
0.05
D2
2
E2
PIN ID
JEDEC
MIN.
NOM.
MAX.
MIN.
NOM.
MAX.
TQ833-1
0.25
0.70
1.25
0.25
0.70
1.25
0.35 x 45°
WEEC
T1233-1
1.25
0.35 x 45°
WEED-1
1.25
0.95
1.10
T1233-3
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEED-1
T1233-4
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEED-1
T1633-2
0.20 REF
0.20 REF
-
0.50
4
3
0.05
0.20 REF
1
EXPOSED PAD VARIATIONS
0.50 BSC.
0.50 BSC.
I
0.95
1.10
1.25
0.35 x 45°
WEED-2
T1633F-3
0.65
0.80
0.95
0.65
0.80
0.95
0.225 x 45°
WEED-2
T1633FH-3
0.65
0.80
0.95
0.65
0.80
0.95
0.225 x 45°
WEED-2
T1633-4
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEED-2
T1633-5
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEED-2
1.10
1.25
0.95
0.95
1.10
-
NOTES:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994.
ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.
N IS THE TOTAL NUMBER OF TERMINALS.
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.
DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.20 mm AND 0.25 mm
FROM TERMINAL TIP.
ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.
DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.
COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS
.
DRAWING CONFORMS TO JEDEC MO220 REVISION C.
MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY.
NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY.
WARPAGE NOT TO EXCEED 0.10mm.
PACKAGE OUTLINE
8, 12, 16L THIN QFN, 3x3x0.8mm
21-0136
I
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.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2004 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products.
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