General Description
The MAX4645/MAX4646 single-pole, single-throw (SPST)
analog switches feature a 2.5
typical on-resistance
(R
ON
) from a +5V supply. R
ON
is flat (0.4
max) over the
specified signal range. Each switch can handle Rail-to-
Rail
analog signals. Off-leakage current is 0.25nA max at
+25C. 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 MAX
packages.
________________________Applications
Battery-Powered Systems
Audio and Video Signal Routing
Low-Voltage Data-Acquisition Systems
Sample-and-Hold Circuits
Communications Circuits
Relay Replacement
____________________________Features
o +1.8V to +5V Single-Supply Operation
o Guaranteed R
ON
2.5
max (5V supply)
3.5
max (3V supply)
o 1.8V Operation
R
ON
30
typ Over Temperature
t
ON
40ns typ, t
OFF
20ns typ
o Low R
ON
Flatness: 0.4
max
o Guaranteed Low Leakage Currents
0.25nA at +25C
o Rail-to-Rail Output Capability
o TTL/CMOS-Logic Compatible
o -75dB Off-Isolation at 1MHz
o Low Distortion: 0.014% typ
MAX4645/MAX4646
Fast, Low-Voltage, 2.5
, SPST,
CMOS Analog Switches
________________________________________________________________ Maxim Integrated Products
1
19-1653; Rev 1; 7/00
Ordering Information
Pin Configurations/Functional Diagrams/Truth Tables
MAX/SO/DIP
PIN 5
5
XYZA
4
1
2
3
NOTE: SOT23-5 PACKAGE
HAS LETTERING NEAREST PIN 5.
TOP VIEW
IN
GND
1
5
V+
COM
MAX4645
2
3
4
SOT23-5
INPUT
0
1
SWITCH STATE
MAX4645
OFF
ON
MAX4646
ON
OFF
SWITCHES SHOWN FOR LOGIC 0 INPUT.
NO
MAX/SO/DIP
IN
GND
1
5
V+
COM
MAX4646
2
3
4
SOT23-5
NC
MAX4645EUT-T
-40C to +85C
PART
TEMP. RANGE
MAX4645EUK-T
-40C to +85C
MAX4646EUK-T
-40C to +85C
MAX4646EUT-T
-40C to +85C
MAX4646EUA
-40C to +85C
MAX4645EUA
-40C to +85C
8 MAX
6 SOT23-6
5 SOT23-5
8 MAX
6 SOT23-6
5 SOT23-5
PIN-
PACKAGE
--
AAHM
ADOC
--
AAHL
ADOB
TOP
MARK
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Pin Configurations/Functional Diagrams/
Truth Tables continued at end of data sheet.
MAX4645/MAX4646
Fast, Low-Voltage, 2.5
, SPST,
CMOS Analog Switches
2
_______________________________________________________________________________________
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
= +70C)
5-Pin SOT23 (derate 7.1mW/C above+70C)............571mW
6-Pin SOT23 (derate 8.7mW/C above +70C)...........696mW
8-Pin MAX (derate 4.1mW/C above+70C) .............330mW
Operating Temperature Range ...........................-40C to +85C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10s) .................................+300C
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.
ABSOLUTE MAXIMUM RATINGS
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)
Note 1: Signals on NO, NC, or COM, exceeding V+ or GND are clamped by internal diodes. Limit forward current to maximum current
rating.
T
A
= +25C
Turn-Off Time (Note 5)
t
OFF
8
10
ns
T
A
= +25C
V
IN
_ = 0.8V or 2.4V
-0.35 0.35
T
A
= T
MIN
to T
MAX
T
A
= +25C
0.6
T
A
= T
MIN
to T
MAX
T
A
= +25C
3
T
A
= +25C
I
COM
= 10mA,
V
NO
or V
NC
= 0 to V+,
V+ = 4.5V
-0.35 0.35
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
CONDITIONS
Turn-On Time (Note 5)
t
ON
12
15
ns
V
NO
, V
NC
= 3V, R
L
= 300
,
C
L
= 35pF, Figure 2
V
NO
, V
NC
= 3V, R
L
= 300
,
C
L
= 35pF, Figure 2
Logic Input Current
I
IN
-0.1
0.005
0.1
A
12
Input Logic Low
V
IL
0.8
V
T
A
= T
MIN
to T
MAX
Input Logic High
V
IH
2.4
V
18
T
A
= T
MIN
to T
MAX
COM On-Leakage Current
(Notes 5, 6)
I
COM(ON)
-0.25 0.01 0.25
nA
COM Off-Leakage Current
(Notes 5, 6)
I
COM(OFF)
-0.25 0.01 0.25
nA
T
A
= T
MIN
to T
MAX
T
A
= +25C
-0.35 0.35
T
A
= T
MIN
to T
MAX
T
A
= +25C
Off-Leakage Current
(NO or NC) (Notes 5, 6)
I
NO(OFF)
,
I
NC(OFF)
-0.25 0.01 0.25
nA
V
COM
= 1V, 4.5V;
V
NO
or V
NC
= 4.5V, 1V;
V+ = 5.5V
On-Resistance Flatness
(Note 4)
R
FLAT(ON)
0.1
0.4
I
COM
= 10mA,
V
NO
or V
NC
= 0 to V+,
V+ = 4.5V
COM to NO or NC
On-Resistance
R
ON
1.5
2.5
T
A
= T
MIN
to T
MAX
Input Voltage Range
V
COM
,
V
NO
, V
NC
0
V+
V
V
COM
= 1V, 4.5V;
V
NO
or V
NC
= 4.5V, 1V;
V+ = 5.5V
ANALOG SWITCH
SWITCH DYNAMIC CHARACTERISTICS
V+ = 5.5V; V
COM
= 4.5V,
1V; V
NO
or V
NC
= 4.5V,
1V, or floating
LOGIC INPUT
MAX4645/MAX4646
Fast, Low-Voltage, 2.5
, SPST,
CMOS Analog Switches
_______________________________________________________________________________________
3
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)
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)
V
0
V+
V
COM
,
V
NO
, V
NC
Input Voltage Range
T
A
= T
MIN
to T
MAX
2.5
3.5
R
ON
COM to NO or NC
On-Resistance
I
COM
= 10mA,
V
NO
or V
NC
= 0 to V+,
V+ = 2.7V
0.5
0.9
R
FLAT(ON)
On-Resistance Flatness
(Note 4)
V
COM
= 1V, 3V;
V
NO
or V
NC
= 3V, 1V;
V+ = 3.3V
nA
-0.25 0.01 0.25
I
NO(OFF)
,
I
NC(OFF)
Off-Leakage Current
(NO or NC) (Notes 5, 6)
T
A
= +25C
T
A
= T
MIN
to T
MAX
-0.35 0.35
T
A
= +25C
T
A
= T
MIN
to T
MAX
V
COM
= 1V, 3V;
V
NO
or V
NC
= 3V, 1V;
V+ = 3.3V
nA
-0.25 0.01 0.25
I
COM(OFF)
COM Off-Leakage Current
(Notes 5, 6)
V+ = 3.3V; V
COM
= 1V, 3V;
V
NO
or V
NC
= 1V,
3V or floating
nA
-0.25 0.01 0.25
I
COM(ON)
COM On-Leakage Current
(Notes 5, 6)
CONDITIONS
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
-0.35 0.35
I
COM
= 10mA,
V
NO
or V
NC
= 0 to V+,
V+ = 2.7V
T
A
= +25C
4.5
T
A
= +25C
T
A
= T
MIN
to T
MAX
1
T
A
= +25C
T
A
= T
MIN
to T
MAX
-0.35 0.35
ANALOG SWITCH
-75
dB
V
NO
= V
NC
= 1V
RMS
,
R
L
= 50
, C
L
= 5pF,
f = 1MHz, Figure 4
T
A
= +25C
PARAMETER
SYMBOL
MIN
TYP
MAX
1.0
UNITS
Positive Supply Current
I+
0.0001
V+ = 5.5V, V
IN
= 0 or V+,
all channels on or off
Total Harmonic Distortion
THD
0.014
%
R
L
= 600
, 5V
P-P
,
f = 20Hz to 20kHz
CONDITIONS
T
A
= T
MIN
to T
MAX
T
A
= +25C
T
A
= +25C
Off-Isolation (Note 7)
V
ISO
-55
dB
V
NO
= V
NC
= 1V
RMS
,
R
L
= 50
, C
L
= 5pF,
f = 10MHz, Figure 4
COM On-Capacitance
C
COM
38
pF
V
COM
= V
NO
, V
NC
= GND
f = 1MHz, Figure 5
COM Off-Capacitance
C
COM
17
pF
V
COM
= GND, f = 1MHz,
Figure 5
NO or NC Capacitance
C
OFF
17
pF
V
NO
, V
NC
= GND,
f = 1MHz, Figure 5
Charge Injection
Q
5
pC
V
GEN
= 2V, C
L
= 1.0nF,
R
GEN
= 0, Figure 3
T
A
= +25C
T
A
= +25C
T
A
= +25C
T
A
= +25C
T
A
= +25C
A
POWER SUPPLY
MAX4645/MAX4646
Fast, Low-Voltage, 2.5
, SPST,
CMOS Analog Switches
4
_______________________________________________________________________________________
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 +25C. 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 +85C and guaranteed by correlation at +25C.
Note 7: Off-Isolation = 20log
10
(V
COM /
V
NO
), V
COM
= output, V
NO
= input to off switch.
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)
-75
T
A
= +25C
Turn-Off Time (Note 5)
t
OFF
8
10
ns
T
A
= +25C
V
IN
_ = 0.4V or 2.0V
V
NO
= V
NC
= 1V
RMS
,
R
L
= 50
, C
L
= 5pF,
f = 1MHz, Figure 4
T
A
= +25C
PARAMETER
SYMBOL
MIN
TYP
MAX
1.0
UNITS
Positive Supply Current
I+
0.0001
A
V+ = 3.3V, V
IN
= 0 or V+,
all channels on or off
CONDITIONS
T
A
= T
MIN
to T
MAX
T
A
= +25C
Off-Isolation (Note 7)
V
ISO
-55
dB
V
NO
= V
NC
= 1V
RMS
,
R
L
= 50
, C
L
= 5pF,
f = 10MHz, Figure 4
COM On-Capacitance
C
COM
38
pF
V
COM
= V
NO
, V
NC
= GND,
f = 1MHz, Figure 5
COM Off-Capacitance
C
COM
17
pF
V
COM
= GND, f = 1MHz,
Figure 5
NO or NC Capacitance
C
OFF
17
pF
V
NO
, V
NC
= GND,
f = 1MHz, Figure 5
Charge Injection
Q
4
pC
V
GEN
= 1.5V, C
L
= 1.0nF,
R
GEN
= 0, Figure 3
T
A
= +25C
T
A
= +25C
T
A
= +25C
T
A
= +25C
T
A
= +25C
Turn-On Time (Note 5)
t
ON
12
15
ns
V
NO
, V
NC
= 2.0V,
R
L
= 300
, C
L
= 35pF,
Figure 2
V
NO
, V
NC
= 2.0V,
R
L
= 300
, C
L
= 35pF,
Figure 2
Logic Input Current
I
IN
-1
0.005
1
A
13
Input Logic Low
V
IL
0.4
V
T
A
= T
MIN
to T
MAX
Input Logic High
V
IH
2.0
V
20
T
A
= T
MIN
to T
MAX
LOGIC INPUT
SWITCH DYNAMIC CHARACTERISTICS
POWER SUPPLY
MAX4645/MAX4646
Fast, Low-Voltage, 2.5
, SPST,
CMOS Analog Switches
_______________________________________________________________________________________
5
-10
0
10
20
30
40
50
60
70
0
1
2
3
4
5
SUPPLY CURRENT vs. SUPPLY VOLTAGE
AND TEMPERATURE
MAX4645/6-04
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (nA)
T
A
= +85C
T
A
= +25C
T
A
= -40C
0
4
2
8
6
10
12
-40
0
20
-20
40
60
100
80
TURN-ON/TURN-OFF TIME
vs. TEMPERATURE
MAX4645/6-05
TEMPERATURE (C)
t
ON
/t
OFF
(ns)
t
ON
t
OFF
V
COM
= 3V
V+ = 5V
0
2
1
4
3
5
6
7
8
1.0
2.0
2.5
1.5
3.0
3.5
4.0
4.5
5.0
TURN-ON/TURN-OFF TIME
vs. V
COM
MAX4645/6-06
V
COM
(V)
t
ON
/t
OFF
(ns)
t
ON
t
OFF
V+ = 5V
0
4
2
8
6
10
12
0
2
1
3
4
5
ON-RESISTANCE vs. V
COM
AND SUPPLY VOLTAGE
MAX4645/6-01
V
COM
(V)
R
ON
(
)
V+ = 1.8V
V+ = 2.5V
V+ = 3V
V+ = 5V
0
0.5
1.5
1.0
2.0
2.5
0
2
1
3
4
5
ON-RESISTANCE vs. V
COM
AND TEMPERATURE
MAX4645/6-02
V
COM
(V)
R
ON
(
)
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
V+ = 4.5V
1
-40
-20
0
20
40
60
80
0.01
0.1
ON/OFF-LEAKAGE CURRENT
vs. TEMPERATURE
MAX4645/6-03
TEMPERATURE (
C)
ON/OFF-LEAKAGE (nA)
ON-LEAKAGE
OFF-LEAKAGE
V+ = 5.5V
__________________________________________Typical Operating Characteristics
(T
A
= +25C, unless otherwise noted.)
0
2
1
3
4
5
CHARGE INJECTION vs. V
COM
MAX4645/6-07
V
COM
(V)
CHARGE INJECTION (pC)
V+ = 5V
V+ = 3V
30
25
20
15
10
5
0
-5
-20
-15
-10
0.016
0.014
0.012
0.010
0.008
0.006
0.004
0.002
0
0.01
1
10
0.1
100
MAX4645/6-08
FREQUENCY (kHz)
THD (%)
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
INPUT IMPEDANCE = 600
f = 20Hz TO 50kHz
0
-100
0.1
1
10
100
1000
FREQUENCY RESPONSE
-80
MAX4645/6-09
FREQUENCY (MHz)
RESPONSE (dB)
-60
-40
-20
-30
-50
-70
-90
-10
V+ = 5V
50
IN AND OUT
ON-LOSS
OFF-LOSS
PDF 
ZIP