19-1657; Rev 1; 1/11
High-Speed, Low-Voltage, 4
Ω
,
SPDT CMOS Analog Switch
General Description
The MAX4644 is a single-pole/double-throw (SPDT)
switch that operates from a single supply ranging from
+1.8V to +5.5V. It provides low 4Ω on-resistance (R
ON
)
as well as 1Ω R
ON
flatness over the entire analog-signal
range. The MAX4644 offers fast switching times of less
than 20ns while ensuring break-before-make operation.
It typically consumes only 0.01μW of quiescent power,
making it suitable for use in low-power, portable appli-
cations.
The MAX4644’s features include low leakage currents
over the entire temperature range, TTL/CMOS-compati-
ble digital logic, and excellent AC characteristics. It is
packaged in either a small 8-pin μMAX
®
or a tiny 6-pin
SOT23.
Features
♦
+1.8V to +5.5V Single-Supply Operation
♦
Rail-to-Rail Analog-Signal Range
♦
Guaranteed R
ON
4Ω max (+5V Supply)
8Ω max (+3V Supply)
♦
+1.8V Operation
R
ON
30Ω (typ) Over Temperature
t
ON
18ns (typ), t
OFF
12ns typ
♦
Guaranteed R
ON
Flatness: 0.75Ω (typ) (+5V Supply)
♦
Guaranteed R
ON
Match Between Channels:
0.1Ω typ (+5V Supply)
♦
Low Leakage (< 0.35nA) Over Entire Temperature
Range
♦
Excellent AC Characteristics
Low Crosstalk: -82dB at 1MHz
High Off-Isolation: -80dB at 1MHz
0.018% Total Harmonic Distortion
♦
Low Power Consumption: < 0.01µW
MAX4644
Applications
Battery-Operated Equipment
Audio and Video Signal Routing
Low-Voltage Data-Acquisition Systems
Sample-and-Hold Circuits
Communications Circuits
Ordering Information
PART
MAX4644EUT+T
TEMP. RANGE
-40°C to +85°C
PIN-
PACKAGE
6 SOT23
TOP
MARK
AAHQ
—
MAX
is a registered trademark of Maxim Integrated
Products, Inc.
MAX4644EUA+T
-40°C to +85°C
8 μMAX
+Denotes
a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Pin Configurations/Functional Diagrams/Truth Table
TOP VIEW
MAX4644
IN 1
V+ 2
GND 3
6
5
4
NO
COM
NC
COM 1
NC 2
GND 3
V+ 4
MAX4644
8
7
6
5
NO
N.C.
IN
N.C.
SOT23-6
μMAX
MAX4644
IN
0
1
NC
ON
OFF
NO
OFF
ON
________________________________________________________________
Maxim Integrated Products
1
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.
High-Speed, Low-Voltage, 4
Ω
,
SPDT CMOS Analog Switch
MAX4644
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
V+ .............................................................................-0.3V to +6V
IN, COM, NO, NC (Note 1) ...........................-0.3V to (V+ + 0.3V)
Continuous Current (any terminal)....................................±20mA
Continuous Current (NO, NC, and COM) .........................±50mA
Peak Current (NO, NC, and COM, pulsed at 1ms,
10% duty cycle)......................................................... ±100mA
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SOT23 (derate 8.70mW/°C above +70°C)........ 696mW
8-Pin μMAX (derate 4.5mW/°C above +70°C) ........... 362mW
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
Soldering Temperature (reflow) ...................................... +260°C
Note 1:
Signals on NO, NC, COM, or IN exceeding V+ or 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—Single +5V Supply
(V+ = +4.5V to +5.5V, V
INH
= 2.4V, V
INL
= 0.8V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
ANALOG SWITCH
Analog-Signal Range
V
COM
,
V
NO
,
V
NC
R
ON
V+ = 4.5V, I
COM
=
10mA, V
NO
or
V
NC
= 0 to V+
V+ = 4.5V, I
COM
=
10mA, V
NO
or
V
NC
= 0 to V+
V+ = 4.5V, I
COM
=
10mA, V
NO
or
V
NC
= 0 to V+
V+ = 5.5V, V
COM
=
1V or 4.5V, V
NO
or
V
NC
= 4.5V or 1V
V+ = 5.5V, V
COM
=
1V or 4.5V, V
NO
or
V
NC
= 4.5V or 1V
V+ = 5.5V, V
COM
=
1V or 4.5V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
-0.25
-0.35
-0.25
-0.35
-0.25
-0.35
2.4
0.8
V
IN
= 0.8V or 2.4V
-0.1
0.005
0.1
0.01
0.01
0.01
0.75
0.1
Ω
0.4
1
Ω
1.2
0.25
nA
0.35
0.25
nA
0.35
0.25
0.35
nA
0
V+
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2.5
4
Ω
4.75
On-Resistance
On-Resistance Match
Between Channels (Note 2)
ΔR
ON
On-Resistance Flatness
(Note 3)
R
FLAT
NO, NC Off-Leakage
Current (Note 4)
I
NO(OFF)
,
I
NC(OFF)
COM Off-Leakage Current
(Note 4)
COM On-Leakage Current
(Notes 4, 5)
DIGITAL
INPUTS
INPUTS
Input-Logic High
Input-Logic Low
Input Current
I
COM(OFF)
I
COM(ON)
V
IH
V
IL
I
IN
V
V
μA
2
_______________________________________________________________________________________
High-Speed, Low-Voltage, 4
Ω
,
SPDT CMOS Analog Switch
MAX4644
ELECTRICAL CHARACTERISTICS —Single +5V Supply (continued)
(V+ = +4.5V to +5.5V, V
INH
= 2.4V, V
INL
= 0.8V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DYNAMIC
Turn-On Time (Note 4)
t
ON
R
L
= 300Ω; C
L
=
35pF; V
NO
, V
NC
= 3V;
Figure 2
R
L
= 300Ω; C
L
=
35pF; V
NO
, V
NC
= 3V;
Figure 2
R
L
= 300Ω;
C
L
= 35pF; V
NO
or
V
NC
= +3V; Figure 2
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
1
5
12
34
f = 10MHz
f = 1MHz
f = 10MHz
f = 1MHz
-55
-80
-62
-82
0.018
0.001
1.0
pC
pF
pF
dB
dB
%
μA
8
ns
3
11
15
ns
18
5
ns
6
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Turn-Off Time (Note 4)
t
OFF
Break-Before-Make (Note 4)
Charge Injection
NO, NC Off-Capacitance
Switch On-Capacitance
Off-Isolation (Note 6)
Crosstalk (Note 7)
Total Harmonic Distortion
SUPPLY
Positive Supply Current
t
BBM
Q
C
NO(OFF),
C
NC(OFF)
C
(ON)
V
ISO
V
CT
THD
I+
V
GEN
= 0V, R
GEN
= 0V, C
L
= 1nF, Figure 4
NO or NC = GND, f = 1MHz, Figure 5
f = 1MHz, Figure 5
C
L
= 5pF, R
L
= 50Ω,
Figure 3
C
L
= 5pF, R
L
= 50Ω,
Figure 3
R
L
= 600Ω, 0.5Vp-p, f = 20Hz to 20kHz
V+ = 5.5V, V
IN
= 0V or V+
ELECTRICAL CHARACTERISTICS—Single +3V Supply
(V+ = +2.7V to +3.3V, V
INH
= 2.0V, V
INL
= 0.4V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
ANALOG SWITCH
Analog-Signal Range
V
COM
,
V
NO
,
V
NC
R
ON
V+ = 2.7V, I
COM
=
10mA, V
NO
or
V
NC
= 0 to V+
V+ = 2.7V, I
COM
=
10mA, V
NO
or
V
NC
= 0 to V+
V+ = 2.7V, I
COM
=
10mA, V
NO
or
V
NC
= 0 to V+
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
1.5
0.1
Ω
0.4
3
3.5
Ω
0
V+
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
6
8
Ω
9
On-Resistance
On-Resistance Match
Between Channels (Note 2)
On-Resistance Flatness
(Note 3)
ΔR
ON
R
FLAT
_______________________________________________________________________________________
3
High-Speed, Low-Voltage, 4
Ω
,
SPDT CMOS Analog Switch
MAX4644
ELECTRICAL CHARACTERISTICS—Single +3V Supply (continued)
(V+ = +2.7V to +3.3V, V
INH
= 2.0V, V
INL
= 0.4V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DIGITAL INPUTS
Input-Logic High
Input-Logic Low
Input Current
DYNAMIC
Turn-On Time (Note 4)
t
ON
R
L
= 300Ω; C
L
=
35pF; V
NO
, V
NC
= 2V;
Figure 2
R
L
= 300Ω; C
L
=
35pF; V
NO
, V
NC
= 2V;
Figure 2
R
L
= 300Ω; C
L
=
35pF; V
NO
, V
NC
= 2V;
Figure 2
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
1
5
12
34
f = 10MHz
f = 1MHz
f = 10MHz
f = 1MHz
-55
-80
-62
-82
0.001
1.0
pC
pF
pF
dB
dB
8
ns
4
14
20
ns
22
7.5
ns
8
V
IH
V
IL
I
IN
V
IN
= 0.4V or 2.0V
-0.1
0.005
2.0
0.4
0.1
V
V
μA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Turn-Off Time (Note 4)
t
OFF
Break-Before-Make (Note 4)
Charge Injection
NO, NC Off-Capacitance
Switch On-Capacitance
Off-Isolation (Note 6)
Crosstalk (Note 7)
SUPPLY
Positive Supply Current
t
BBM
Q
C
NO(OFF)
,
C
NC(OFF)
C
(ON)
V
ISO
V
CT
V
GEN
= 0V, R
GEN
= 0V, C
L
= 1nF, Figure 4
NO or NC = GND, f = 1MHz, Figure 5
f = 1MHz, Figure 5
C
L
= 5pF, R
L
= 50Ω,
Figure 3
C
L
= 5pF, R
L
= 50Ω,
Figure 3
I+
V+ = 3.3V, V
IN
= 0V or V+
μA
Note 2:
ΔR
ON
= R
ON(MAX)
- R
ON(MIN)
.
Note 3:
R
ON
flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the
specified analog-signal range.
Note 4:
Guaranteed by design.
Note 5:
On-Leakage performed with voltage applied to COM, with NO and NC left unconnected.
Note 6:
Off-Isolation = 20log
10
(V
O
/ V
I
), where V
O
is V
COM
and V
I
is either V
NC
or V
NO
from the network analyzer.
Note 7:
Crosstalk is measured between the two switches.
4
_______________________________________________________________________________________
High-Speed, Low-Voltage, 4
Ω
,
SPDT CMOS Analog Switch
Typical Operating Characteristics
(V+ = +5V or +3V, V
INH
= V+, INL = GND, T
A
= +25°C, unless otherwise noted.)
MAX4644
ON-RESISTANCE vs. V
COM
MAX4644-01
ON-RESISTANCE vs. TEMPERATURE
I
COM
= 10mA
MAX4644-02
ON-/OFF-LEAKAGE CURRENT
vs. TEMPERATURE
MAX4644-03
20
5
1000
I
COM
= 10mA
15
V+ = 1.8V
R
ON
(Ω)
R
ON
(Ω)
4
V+ = 3V
LEAKAGE (pA)
100
OFF-LEAKAGE
10
V+ = 2.5V
5
V+ = 3V
V+ = 5V
3
V+ = 5V
2
10
ON-LEAKAGE
0
0
1
2
V
COM
(V)
3
4
5
1
-40
-15
10
35
60
85
TEMPERATURE (°C)
1
-40
-15
10
35
60
85
TEMPERATURE (°C)
CHARGE INJECTION vs. V
COM
MAX4644-04
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4644-05
SUPPLY CURRENT vs.
TEMPERATURE
IN = GND
MAX4644-06
140
120
CHARGE INJECTION (pC)
100
80
60
40
20
0
0
V+ = 5V
140
120
SUPPLY CURRENT (nA)
100
80
60
40
20
IN = V+
0
IN = GND
300
250
SUPPLY CURRENT (nA)
200
V+ = 5V
150
100
50
0
V+ = 1.8V
V+ = 3V
1
2
V
COM
(V)
3
4
5
1.8
2.8
3.8
4.8
SUPPLY VOLTAGE (V)
5.8
-40
-15
10
35
60
85
TEMPERATURE (°C)
LOGIC THRESHOLD vs.
SUPPLY VOLTAGE
MAX4644-07
SWITCHING TIMES vs. SUPPLY VOLTAGE
MAX4644-08
SWITCHING TIMES vs. TEMPERATURE
V+ = 5V
MAX4644-09
2.0
15
10
12
LOGIC THRESHOLD (V)
SWITCHING TIMES (ns)
SWITCHING TIMES (ns)
1.5
8
t
ON
6
t
OFF
4
9
t
ON
6
t
OFF
3
1.0
0.5
2
0
1.8
2.6
3.4
4.2
5.0
5.8
SUPPLY VOLTAGE (V)
0
2
3
4
5
SUPPLY VOLTAGE (V)
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
_______________________________________________________________________________________
5
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