19-1653; Rev 2; 2/04
Fast, Low-Voltage, 2.5Ω, SPST,
CMOS Analog Switches
General Description
The MAX4645/MAX4646 single-pole, single-throw (SPST)
analog switches feature a 2.5Ω typical on-resistance
(R
ON
) from a +5V supply. R
ON
is flat (0.4Ω max) over the
specified signal range. Each switch can handle Rail-to-
Rail
®
analog signals. Off-leakage current is 0.25nA max at
+25°C. These analog switches are ideal in low-distortion
applications and are the preferred solution over mechani-
cal relays in automated test equipment or applications
where current switching is required. They have low power
requirements, require less board space, and are more
reliable than mechanical relays.
These switches operate from a +1.8V to +5V single sup-
ply, making them ideal for use in battery-powered applica-
tions. The MAX4645/MAX4646 have fast switching speeds
of 12ns turn-on time (t
ON
) and 8ns turn-off time (t
OFF
).
The MAX4645 is a normally open (NO) switch, and the
MAX4646 is a normally closed (NC) switch. Both are
available in 5-pin SOT23, 6-pin SOT23, and 8-pin µMAX
packages.
____________________________Features
♦
+1.8V to +5V Single-Supply Operation
♦
Guaranteed R
ON
2.5Ω max (5V supply)
3.5Ω max (3V supply)
♦
1.8V Operation
R
ON
30Ω typ Over Temperature
t
ON
40ns typ, t
OFF
20ns typ
♦
Low R
ON
Flatness: 0.4Ω max
♦
Guaranteed Low Leakage Currents
±0.25nA at +25°C
♦
Rail-to-Rail Output Capability
♦
TTL/CMOS-Logic Compatible
♦
-75dB Off-Isolation at 1MHz
♦
Low Distortion: 0.014% typ
MAX4645/MAX4646
Ordering Information
PART
MAX4645EUK-T
MAX4645EUT-T
MAX4645EUA
MAX4646EUK-T
MAX4646EUT-T
MAX4646EUA
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
5 SOT23-5
6 SOT23-6
8 µMAX
5 SOT23-5
6 SOT23-6
8 µMAX
TOP
MARK
ADOB
AAHL
—
ADOC
AAHM
—
________________________Applications
Battery-Powered Systems
Audio and Video Signal Routing
Low-Voltage Data-Acquisition Systems
Sample-and-Hold Circuits
Communications Circuits
Relay Replacement
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Pin Configurations/Functional Diagrams/Truth Tables
TOP VIEW
PIN 5
COM 1
5
V+
COM 1
5
V+
5
XYZA
4
NO
2
NC
2
1
2
3
GND 3
4 IN
MAX4645
µMAX/SO/DIP
GND 3
4 IN
MAX4646
µMAX/SO/DIP
SOT23-5
INPUT
NOTE: SOT23-5 PACKAGE
HAS LETTERING NEAREST PIN 5.
SOT23-5
SWITCH STATE
MAX4646
MAX4645
ON
OFF
OFF
ON
Pin Configurations/Functional Diagrams/
Truth Tables continued at end of data sheet.
0
1
SWITCHES SHOWN FOR LOGIC 0 INPUT.
________________________________________________________________
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.
Fast, Low-Voltage, 2.5Ω, SPST,
CMOS Analog Switches
MAX4645/MAX4646
ABSOLUTE MAXIMUM RATINGS
V+, V
IN
to GND ...........................................................-0.3 to +6V
COM, NO, NC to GND (Note 1)....................-0.3V to (V+ + 0.3V)
Continuous Current (any terminal)....................................±50mA
Peak Current COM, NO, NC
(pulsed at 1ms 10% duty cycle)................................±100mA
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above+70°C)............571mW
6-Pin SOT23 (derate 8.7mW/°C above +70°C)...........696mW
8-Pin µMAX (derate 4.1mW/°C above+70°C) .............330mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
Signals on NO, NC, or COM, exceeding V+ or GND are clamped by internal diodes. Limit forward 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
IH
= 2.4V, V
IL
= 0.8V, T
A
= T
MIN
to T
MAX
, unless otherwise specified.) (Notes 2, 3)
PARAMETER
ANALOG SWITCH
Input Voltage Range
COM to NO or NC
On-Resistance
On-Resistance Flatness
(Note 4)
Off-Leakage Current
(NO or NC) (Notes 5, 6)
COM Off-Leakage Current
(Notes 5, 6)
COM On-Leakage Current
(Notes 5, 6)
LOGIC INPUT
Input Logic High
Input Logic Low
Logic Input Current
V
IH
V
IL
I
IN
V
IN
_ = 0.8V or 2.4V
-0.1
0.005
2.4
0.8
0.1
V
V
µA
V
COM
,
V
NO
, V
NC
R
ON
I
COM
= 10mA,
V
NO
or V
NC
= 0 to V+,
V+ = 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
-0.25
-0.35
-0.25
-0.35
-0.25
-0.35
0.01
0.01
0.01
0.1
0
1.5
V+
2.5
Ω
3
0.4
Ω
0.6
0.25
nA
0.35
0.25
nA
0.35
0.25
nA
0.35
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
COM
= 10mA,
R
FLAT(ON)
V
NO
or V
NC
= 0 to V+,
V+ = 4.5V
I
NO(OFF)
,
I
NC(OFF)
V
COM
= 1V, 4.5V;
V
NO
or V
NC
= 4.5V, 1V;
V+ = 5.5V
V
COM
= 1V, 4.5V;
I
COM(OFF)
V
NO
or V
NC
= 4.5V, 1V;
V+ = 5.5V
I
COM(ON)
V+ = 5.5V; V
COM
= 4.5V,
1V; V
NO
or V
NC
= 4.5V,
1V, or floating
SWITCH DYNAMIC CHARACTERISTICS
Turn-On Time (Note 5)
Turn-Off Time (Note 5)
t
ON
t
OFF
V
NO
, V
NC
= 3V, R
L
= 300Ω,
C
L
= 35pF, Figure 2
V
NO
, V
NC
= 3V, R
L
= 300Ω,
C
L
= 35pF, Figure 2
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
8
12
15
18
10
12
ns
ns
2
_______________________________________________________________________________________
Fast, Low-Voltage, 2.5Ω, SPST,
CMOS Analog Switches
ELECTRICAL CHARACTERISTICS—Single +5V Supply (continued)
(V+ = 4.5V to 5.5V, V
IH
= 2.4V, V
IL
= 0.8V, T
A
= T
MIN
to T
MAX
, unless otherwise specified.) (Notes 2, 3)
PARAMETER
Charge Injection
NO or NC Capacitance
COM Off-Capacitance
COM On-Capacitance
SYMBOL
Q
C
OFF
C
COM
C
COM
CONDITIONS
V
GEN
= 2V, C
L
= 1.0nF,
R
GEN
= 0, Figure 3
V
NO
, V
NC
= GND,
f = 1MHz, Figure 5
V
COM
= GND, f = 1MHz,
Figure 5
V
COM
= V
NO
, V
NC
= GND
f = 1MHz, Figure 5
V
NO
= V
NC
= 1V
RMS
,
R
L
= 50Ω, C
L
= 5pF,
f = 10MHz, Figure 4
V
NO
= V
NC
= 1V
RMS
,
R
L
= 50Ω, C
L
= 5pF,
f = 1MHz, Figure 4
R
L
= 600Ω, 5V
P-P
,
f = 20Hz to 20kHz
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
MIN
TYP
5
17
17
38
MAX
UNITS
pC
pF
pF
pF
MAX4645/MAX4646
T
A
= +25°C
-55
dB
Off-Isolation (Note 7)
V
ISO
T
A
= +25°C
-75
dB
Total Harmonic Distortion
POWER SUPPLY
Positive Supply Current
THD
T
A
= +25°C
0.014
%
I+
V+ = 5.5V, V
IN
= 0 or V+,
all channels on or off
T
A
= +25°C
T
A
= T
MIN
to T
MAX
0.0001
1.0
µA
ELECTRICAL CHARACTERISTICS—Single +3V Supply
(V+ = 2.7V to 3.3V, V
IH
= 2.0V, V
IL
= 0.4V, T
A
= T
MIN
to T
MAX
, unless otherwise specified.) (Notes 2, 3)
PARAMETER
ANALOG SWITCH
Input Voltage Range
COM to NO or NC
On-Resistance
On-Resistance Flatness
(Note 4)
Off-Leakage Current
(NO or NC) (Notes 5, 6)
COM Off-Leakage Current
(Notes 5, 6)
COM On-Leakage Current
(Notes 5, 6)
V
COM
,
V
NO
, V
NC
R
ON
I
COM
= 10mA,
V
NO
or V
NC
= 0 to V+,
V+ = 2.7V
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
0.01
0.01
0.01
0.5
0
2.5
V+
3.5
Ω
4.5
0.9
Ω
1
0.25
nA
0.35
0.25
nA
0.35
0.25
nA
0.35
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
COM
= 10mA,
R
FLAT(ON)
V
NO
or V
NC
= 0 to V+,
V+ = 2.7V
I
NO(OFF)
,
I
NC(OFF)
V
COM
= 1V, 3V;
V
NO
or V
NC
= 3V, 1V;
V+ = 3.3V
V
COM
= 1V, 3V;
I
COM(OFF)
V
NO
or V
NC
= 3V, 1V;
V+ = 3.3V
I
COM(ON)
V+ = 3.3V; V
COM
= 1V, 3V; T
A
= +25°C
V
NO
or V
NC
= 1V,
T
A
= T
MIN
to T
MAX
3V or floating
_______________________________________________________________________________________
3
Fast, Low-Voltage, 2.5Ω, SPST,
CMOS Analog Switches
MAX4645/MAX4646
ELECTRICAL CHARACTERISTICS—Single +3V Supply (continued)
(V+ = 2.7V to 3.3V, V
IH
= 2.0V, V
IL
= 0.4V, T
A
= T
MIN
to T
MAX
, unless otherwise specified.) (Notes 2, 3)
PARAMETER
LOGIC INPUT
Input Logic High
Input Logic Low
Logic Input Current
V
IH
V
IL
I
IN
V
IN
_ = 0.4V or 2.0V
V
NO
, V
NC
= 2.0V,
R
L
= 300Ω, C
L
= 35pF,
Figure 2
V
NO
, V
NC
= 2.0V,
R
L
= 300Ω, C
L
= 35pF,
Figure 2
V
GEN
= 1.5V, C
L
= 1.0nF,
R
GEN
= 0, Figure 3
V
NO
, V
NC
= GND,
f = 1MHz, Figure 5
V
COM
= GND, f = 1MHz,
Figure 5
V
COM
= V
NO
, V
NC
= GND,
f = 1MHz, Figure 5
V
NO
= V
NC
= 1V
RMS
,
R
L
= 50Ω, C
L
= 5pF,
f = 10MHz, Figure 4
V
NO
= V
NC
= 1V
RMS
,
R
L
= 50Ω, C
L
= 5pF,
f = 1MHz, Figure 4
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
= +25°C
T
A
= +25°C
T
A
= +25°C
4
17
17
38
8
-1
0.005
12
2.0
0.4
1
15
ns
20
10
ns
13
pC
pF
pF
pF
V
V
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SWITCH DYNAMIC CHARACTERISTICS
Turn-On Time (Note 5)
t
ON
Turn-Off Time (Note 5)
t
OFF
Charge Injection
NO or NC Capacitance
COM Off-Capacitance
COM On-Capacitance
Q
C
OFF
C
COM
C
COM
T
A
= +25°C
-55
dB
Off-Isolation (Note 7)
V
ISO
T
A
= +25°C
-75
POWER SUPPLY
Positive Supply Current
I+
V+ = 3.3V, V
IN
= 0 or V+,
all channels on or off
T
A
= +25°C
T
A
= T
MIN
to T
MAX
0.0001
1.0
µA
Note 2:
The algebraic convention, where the most negative value is a minimum and the most positive value is a maximum, is used
in this data sheet.
Note 3:
SOT packages are 100% production tested at +25°C. Limits at the maximum rated temperature are guaranteed by
correlation.
Note 4:
Flatness is defined as the difference between the maximum and the minimum value of on-resistance as measured over the
specified analog signal ranges.
Note 5:
Guaranteed by design.
Note 6:
Leakage parameters are 100% tested at +85°C and guaranteed by correlation at +25°C.
Note 7:
Off-Isolation = 20log
10
(V
COM /
V
NO
), V
COM
= output, V
NO
= input to off switch.
4
_______________________________________________________________________________________
Fast, Low-Voltage, 2.5Ω, SPST,
CMOS Analog Switches
MAX4645/MAX4646
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
ON-RESISTANCE vs. V
COM
AND SUPPLY VOLTAGE
MAX4645/6-01
ON-RESISTANCE vs. V
COM
AND TEMPERATURE
MAX4645/6-02
ON/OFF-LEAKAGE CURRENT
vs. TEMPERATURE
MAX4645/6-03
12
V+ = 1.8V
10
8
R
ON
(Ω)
2.5
1
2.0
ON/OFF-LEAKAGE (nA)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
6
4
2
V+ = 5V
0
0
1
2
3
4
5
V
COM
(V)
V+ = 2.5V
V+ = 3V
R
ON
(Ω)
1.5
ON-LEAKAGE
0.1
OFF-LEAKAGE
1.0
0.5
V+ = 4.5V
0
0
1
2
3
4
5
V
COM
(V)
0.01
-40
-20
0
20
40
TEMPERATURE (°C)
V+ = 5.5V
60
80
SUPPLY CURRENT vs. SUPPLY VOLTAGE
AND TEMPERATURE
MAX4645/6-04
TURN-ON/TURN-OFF TIME
vs. TEMPERATURE
MAX4645/6-05
TURN-ON/TURN-OFF TIME
vs. V
COM
7
6
t
ON
/t
OFF
(ns)
5
4
3
2
t
OFF
t
ON
MAX4645/6-06
70
60
SUPPLY CURRENT (nA)
50
12
10
8
6
4
t
ON
t
OFF
8
30
20
10
0
-10
0
1
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
2
0
2
3
4
5
-40
-20
0
20
40
60
80
100
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
V
COM
= 3V
V+ = 5V
t
ON
/t
OFF
(ns)
40
1
V+ = 5V
0
1.0
1.5
2.0
2.5
3.0
V
COM
(V)
3.5
4.0
4.5
5.0
CHARGE INJECTION vs. V
COM
MAX4645/6-07
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
MAX4645/6-08
FREQUENCY RESPONSE
-10
-20
RESPONSE (dB)
-30
-40
-50
-60
-70
OFF-LOSS
ON-LOSS
MAX4645/6-09
30
25
20
CHARGE INJECTION (pC)
15
V+ = 3V
V+ = 5V
0.016
0.014
0.012
0.010
THD (%)
0.008
0.006
0.004
0.002
0
INPUT IMPEDANCE = 600Ω
f = 20Hz TO 50kHz
0.01
0.1
1
FREQUENCY (kHz)
10
0
10
5
0
-5
-10
-15
-20
0
1
2
-80
-90
-100
100
0.1
1
10
FREQUENCY (MHz)
100
1000
V+ = 5V
50Ω IN AND OUT
3
4
5
V
COM
(V)
_______________________________________________________________________________________
5
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