19-1656; Rev 1; 2/02
High-Speed, Low-Voltage, 4Ω, Dual SPST
CMOS Analog Switches
General Description
The MAX4641/MAX4642/MAX4643 are monolithic, dual,
single-pole/single-throw (SPST) switches that can operate
from a single supply ranging from +1.8V to +5.5V. The
MAX4641/MAX4642/MAX4643 provide low 4Ω on-resis-
tance (R
ON
), 0.6Ω R
ON
matching between channels, and
1Ω R
ON
flatness over the entire analog signal range.
These devices offer fast switching times of less than 20ns
while consuming less than 0.01µW of quiescent power.
The MAX4641 has two normally open (NO) switches,
and the MAX4642 has two normally closed (NC)
switches. The MAX4643 has one NO switch and one NC
switch. All three devices have low 0.35nA leakage cur-
rents over the entire temperature range. The MAX4641/
MAX4642/MAX4643 are available in small 8-pin µMAX
and 8-pin QFN packages.
Features
o
+1.8V to +5.5V Single-Supply Operation
o
Rail-to-Rail™ Analog Signal Range
o
Guaranteed R
ON
4Ω max (+5V supply)
8Ω max (+3V supply)
o
+1.8V Operation
R
ON
30Ω typ Over Temperature
t
ON
18ns typ, t
OFF
12ns typ
o
Guaranteed R
ON
Flatness: 1Ω (+5V supply)
o
Guaranteed R
ON
Match Between Channels
0.6Ω (+5V supply)
o
Low Leakage (<0.35nA) Over Entire Temperature
Range
o
Excellent AC Characteristics
Low Crosstalk: -97dB at 1MHz
High Off-Isolation: -80dB at 1MHz
0.018% Total Harmonic Distortion
o
Low Power Consumption: < 0.01µW
MAX4641/MAX4642/MAX4643
Applications
Battery-Operated Equipment
Audio and Video Signal Routing
Low-Voltage Data-Acquisition Systems
Sample-and-Hold Circuits
Communications Circuits
Ordering Information
PART
MAX4641EUA
MAX4641EGA
MAX4642EUA
MAX4642EGA
MAX4643EUA
MAX4643EGA
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
8 QFN 3 x 3
8 µMAX
8 QFN 3 x 3
8 µMAX
8 QFN 3 x 3
Rail-to-Rail is a trademark of Nippon Motorola, Ltd.
Pin Configurations/Functional Diagrams/Truth Tables
TOP VIEW
MAX4641
NO1
1
COM1
2
IN2
3
GND
4
µMAX
MAX4641
IN_
0
1
NO_
OFF
ON
IN_
0
1
8
7
6
5
V+
IN1
COM2
NO2
NC1
1
COM1
2
IN2
3
GND
4
µMAX
MAX4642
NC_
ON
OFF
IN_
0
1
MAX4642
8
7
6
5
V+
IN1
COM2
NC2
NO1
1
COM1
2
IN2
3
GND
4
MAX4643
8
7
6
5
µMAX
MAX4643
NO1
OFF
ON
NC2
ON
OFF
V+
IN1
COM2
NC2
Pin Configurations continued at end of data sheet.
________________________________________________________________
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.
High-Speed, Low-Voltage, 4Ω, Dual SPST
CMOS Analog Switches
MAX4641/MAX4642/MAX4643
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_, COM_)...........................±50mA
Peak Current (NO_, NC_, COM_, pulsed at 1ms,
10% duty cycle)........................................................ ±100mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C) ........... 362mW
8-Pin QFN (derate 24.4mW/°C above +70°C) ......... 1951mW
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 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
0.85
0.2
0
V+
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2.5
4
Ω
5
0.6
Ω
0.8
1
Ω
1.5
0.25
nA
0.35
0.25
nA
0.35
0.25
0.35
nA
On-Resistance
On-Resistance Match
Between Channels
(Notes 2, 8)
On-Resistance Flatness
(Note 3)
∆R
ON
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
IN_ Input Logic High
IN_ Input Logic Low
IN_ Input Current
I
COM_(OFF)
I
COM_(ON)
V
IH
V
IL
I
IN
V
V
µA
2
_______________________________________________________________________________________
High-Speed, Low-Voltage, 4Ω, Dual SPST
CMOS Analog Switches
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_
=
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
2
7
7
18
f = 10MHz
f = 1MHz
f = 10MHz
f = 1MHz
-56
-80
-77
-97
0.018
0.001
1.0
pC
pF
pF
pF
dB
dB
%
µA
7
ns
5
9
15
ns
18
8
ns
10
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4641/MAX4642/MAX4643
Turn-Off Time (Note 4)
t
OFF
Break-Before-Make (Note 4)
(MAX4643 only)
Charge Injection
NO_, NC_ Off-Capacitance
COM_ 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
COM_
(OFF)
C
(ON)
V
ISO
V
CT
THD
I+
V
GEN
= 0, R
GEN
= 0, C
L
= 1nF, Figure 4
NO_ or NC_ = GND, f = 1MHz, Figure 5
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_
= 0 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
0.2
0
V+
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
6
8
Ω
9
0.6
Ω
0.8
3.0
3.5
3
Ω
On-Resistance
On-Resistance Match
Between Channels
(Notes 2, 8)
On-Resistance Flatness
(Note 3)
∆R
ON
R
FLAT
_______________________________________________________________________________________
High-Speed, Low-Voltage, 4Ω, Dual SPST
CMOS Analog Switches
MAX4641/MAX4642/MAX4643
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
IN_ Input Logic High
IN_ Input Logic Low
IN_ 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
2
7
7
18
f = 10MHz
f = 1MHz
f = 10MHz
f = 1MHz
-56
-80
-77
-97
0.001
1.0
pC
pF
pF
pF
dB
dB
7
ns
6
14
20
ns
22
10
ns
11
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)
(MAX4643 only)
Charge Injection
NO_, NC_ Off-Capacitance
COM_ 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
COM_(OFF)
C
(ON)
V
ISO
V
CT
V
GEN
= 0, R
GEN
= 0, C
L
= 1nF, Figure 4
NO_ or NC_ = GND, f = 1MHz, Figure 5
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_
= 0 or V+
µA
Note 2:
∆R
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 floating.
Note 6:
Off-Isolation = 20log
10
(V
O_
/ V
I_
), where V
O
is V
COM_
and V
I
is V
NC_
or V
NO_
from the network analyzer.
Note 7:
Crosstalk is measured between the two switches.
Note 8:
R
ON
and
∆R
ON
matching specifications for QFN-packaged parts are guaranteed by design.
4
_______________________________________________________________________________________
High-Speed, Low-Voltage, 4Ω, Dual SPST
CMOS Analog Switches
Typical Operating Characteristics
(V+ = +5V or +3V, V
INH
= V+, V
INL
= GND, T
A
= +25°C, unless otherwise noted.)
ON-/OFF-LEAKAGE CURRENT
vs. TEMPERATURE
MAX4641/2/3toc02
MAX4641/2/3toc03
MAX4641/MAX4642/MAX4643
ON-RESISTANCE vs. V
COM
I
COM
= 10mA
V+ = 1.8V
MAX4641/2/3toc01
ON-RESISTANCE vs. TEMPERATURE
5
I
COM
= 10mA
4
R
ON
(Ω)
1000
20
15
R
ON
(Ω)
V+ = 3V
LEAKAGE (pA)
100
IN = V+
10
V+ = 2.5V
V+ = 3.0V
3
V+ = 5V
2
10
IN = GND
5
V+ = 5V
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
TOC4641/2/3toc04
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4641/2/3toc05
LOGIC THRESHOLD
vs. SUPPLY VOLTAGE
MAX4641/2/3toc06
75
V+ = 5V
140
120
SUPPLY CURRENT (nA)
100
80
60
40
20
IN = V+
IN = GND
2.0
CHARGE INJECTION (pC)
60
45
LOGIC THRESHOLD (V)
1.5
1.0
30
15
0.5
0
0
1
2
3
4
5
V
COM
(V)
0
1.8
2.8
3.8
4.8
SUPPLY VOLTAGE (V)
5.8
0
1.8
2.6
3.4
4.2
5.0
5.8
SUPPLY VOLTAGE (V)
SWITCHING TIMES vs. SUPPLY VOLTAGE
TOC4641/2/3toc07
SWITCHING TIMES vs. TEMPERATURE
TOC4641/2/3toc08
SUPPLY CURRENT
vs. TEMPERATURE
IN = GND
TOC4641/2/3toc09
15
10
300
250
SUPPLY CURRENT (nA)
200
12
SWITCHING TIMES (ns)
8
SWITCHING TIMES (ns)
9
6
V+ = 5V
150
100
50
0
V+ = 1.8V
V+ = 3V
6
4
3
2
0
2
3
4
5
SUPPLY VOLTAGE (V)
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
-40
-15
10
35
60
85
TEMPERATURE (°C)
_______________________________________________________________________________________
5
嵌入式系统
