19-1906; Rev 0; 2/01
IN
N.C.V+
1
2
8
7
NO
V-NC
GND
COM
SOT23-8
TOP VIEW
3
4
6
5
MAX4649
LOGIC NO
0
1
OFF
ON
NC
ON
OFF
General Description
The MAX4649 is a dual-supply, single-pole/double-
throw (SPDT) analog switch. On-resistance is 45Ωmax
and flat (7Ωmax) over the specified signal range. The
MAX4649 can handle Rail-to-Rail®analog signals, and
conducts analog or digital signals equally well in either
direction. This switch operates from a single +9V to
+36V supply, or from ±4.5V to ±20V dual supplies. The
primary application areas are in the switching and rout-
ing of signals in telecommunications and test equip-
ment.
The MAX4649 features a switch transition time of 130ns
max at +25°C, and a guaranteed break-before-make
switching time of 5ns. Off-leakage current is only 2nA
max at +25°C.
The MAX4649 is available in a tiny 8-pin SOT23 pack-
age.
Applications
PBX, PABX Systems
Communication Systems
DSL
Test Equipment
Avionics
Audio Systems
Redundant Systems
Relay Replacement
PC Multimedia Boards
Features
♦Low On-Resistance 45Ωmax ±15V Supplies
♦5Ωmax RON Match Between Channels
♦Guaranteed RON Flatness Over Specified Signal
Range (7Ωmax)
♦VLLogic Supply Not Required
♦Rail-to-Rail Signal Handling
♦+9V to +36V Single Supply Operation
♦±4.5V to ±20V Dual Supply Operation
♦Low Crosstalk: -92dB at 1MHz
♦High Off-Isolation: -92dB at 1MHz
♦TTL/CMOS-Compatible Control Inputs
45Ω, SPDT Analog Switch in SOT23-8
MAX4649
________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Pin Configuration
Ordering Information
PART TEMP.
RANGE
PIN-
PA CK A G E
TOP
M ARK
MAX4649E KA- T- 40°C to + 85°C 8-SOT23 AAIE
Rail-to-Rail is a registered trademark of Nippon Motorola, Inc.
MAX4649
45Ω, SPDT Analog Switch in SOT23-8
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—Dual ±15V Supplies
(V+ = +15V, V- = -15V, VIH = 2.4V, VIL = 0.8V, TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Notes
2, 3)
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.
V+ ........................................................................-0.3V to +44.0V
V- .........................................................................-44.0V to +0.3V
V+ to V-................................................................-0.3V to +44.0V
All Other Pins (Note 1) ..........................(V- - 0.3V) to (V+ + 0.3V)
Continuous Current into any Terminal ..............................±10mA
Continuous Current (COM, NO, NC) ................................±30mA
Peak Current (COM, NO, NC)
(pulsed at 1ms, 10% duty cycle)..................................±60mA
Continuous Power Dissipation (TA= +70°C)
8-Pin SOT23 (derate 8.9mW/°C above +70°C)...........714mW
Operating Temperature Range
MAX4649EKA ............................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: Signals on NO, NC, COM, or IN exceeding V+ or V- are clamped by internal diodes. Limit forward-diode current to maxi-
mum current rating.
PARAMETER SYMBOL CONDITIONS TAMIN TYP MAX UNITS
ANALOG SWITCH
Analog Signal Range
VNO,
VNC,
VCOM
V- V+ V
+25°C3345
On-Resistance RON ICOM = 1mA; VNO or
VNC = ±10V TMIN to TMAX 60 Ω
+25°C 0.6 5
On-Resistance Matching Between
Channels ∆RON ICOM = 1mA; VNO or
VNC = ±10V TMIN to TMAX 6Ω
+25°C 1.5 7
On-Resistance Flatness
(Note 4)
RFLAT
(ON)
ICOM = 1mA; VNO or
VNC = +5V, 0, -5V TMIN to TMAX 10 Ω
+25°C -2 0.01 2
NO or NC Off-Leakage
Current
INO(OFF)
or
INC
(
OFF
)
VCOM = -14V, +14V;
VNO or VNC = +14V,
-14V TMIN to TMAX -10 10
nA
+25°C-4 4
COM On-Leakage
Current ICOM
(
ON
)
VCOM = +14V, -14V;
VNO or VNC = +14V,
-14V or floating TMIN to TMAX -20 20
nA
DIGITAL I/O
Input Logic High Voltage VIH 2.4 V
Input Logic Low Voltage VIL 0.8 V
Input Leakage IIN VIN = 0 or +5V -1 1 µA
(Voltages referenced to GND.)
MAX4649
45Ω, SPDT Analog Switch in SOT23-8
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS TAMIN TYP MAX UNITS
DYNAMIC CHARACTERISTICS
+25°C 90 130
Transition Time tTRANS
VNO or VNC = ±10V;
RL = 1kΩ;
CL = 35pF; Figure 2 TMIN to TMAX 170
ns
+25°C510
Break-Before-Make Delay tD
VNO or VNC = ±10V;
RL = 300Ω;
CL = 35pF; Figure 3 TMIN to TMAX 2
ns
Charge Injection Q
VGEN = 0; RGEN = 0;
CL = 1nF;
Figure 4
2pC
Off-Isolation VISO
f = 1MHz, RL = 50Ω,
CL = 5pF,
VCOM = 1VRMS;
Figure 5
92 dB
Crosstalk f = 1MHz, RL = 50Ω,
CL = 5pF; Figure 6 92
Total Harmonic Distortion THD f = 20Hz to 20kHz,
RL = 600Ω, 5VRMS 0.015 %
VNO or VNC Off-Capacitance CNO(OFF),
CNC
(
OFF
)
f = 1MHz; Figure 7 6 pF
COM On-Capacitance CCOM
(
ON
)
f = 1MHz; Figure 8 17 pF
POWER SUPPLY
Power-Supply Range ±4.5 ±20 V
+25°C3875
VIN = 5V TMIN to TMAX 100
+25°C 0.01 1
Positive Supply Current I+
VIN = 0 or V+ TMIN to TMAX 10
µA
+25°C 0.01 1
Negative Supply Current I- VIN = 0 or 5V TMIN to TMAX 10 µA
ELECTRICAL CHARACTERISTICS—Dual ±15V Supplies (continued)
(V+ = +15V, V- = -15V, VIH = 2.4V, VIL = 0.8V, TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Notes
2, 3)
MAX4649
45Ω, SPDT Analog Switch in SOT23-8
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS—Single +12V Supply
(V+ = +12V, V- = 0, VIH = 2.4V, VIL = 0.8V, TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 2, 3)
PARAMETER SYMBOL CONDITIONS TAMIN TYP MAX UNITS
ANALOG SWITCH
Analog Signal Range
VNO,
VNC,
VCOM
0V+V
+25°C6890
On-Resistance RON ICOM = 1mA; VNO
or VNC = +10V TMIN to TMAX 115 Ω
+25°C 0.7 6
On-Resistance Matching Between
Channels ∆RON ICOM = 1mA; VNO
or VNC = +10V TMIN to TMAX 7Ω
+25°C917
On-Resistance Flatness
(Note 4) RFL AT
(
ON
)
ICOM = 1mA; VNO
or VNC = +2V, +6V,
+10V TMIN to TMAX 23
Ω
DYNAMIC
+25°C 116 165
Transition Time tTRANS
VNO or VNC = 0,
10V or 10V, 0;
RL = 1kΩ;
CL = 35pF;
Figure 2 TMIN to TMAX 200
ns
+25°C136
Break-Before-Make Delay tD
VNO or VNC =
+10V; RL = 300Ω;
CL = 35pF;
Figure 3 TMIN to TMAX 1
ns
Charge Injection Q V
GE N
= 0; RGE N
= 0;
CL = 1nF; Figure 4 +25°C1pC
POWER SUPPLY
Power Supply Range 936V
+25°C2240
VIN = +5V TMIN to TMAX 50
+25°C 0.01 1
Positive Supply Current I+
VIN = 0 or V+ TMIN to TMAX 10
µA
Note 2: The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
Note 3: All parts are 100% tested at +25°C. Limits across the full temperature range are guaranteed by design and correlation.
Note 4: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the
specified analog signal range.
30
50
40
70
60
90
80
100
0 5 10 15
MAX4649 toc04
VCOM (V)
RON (Ω)
ON-RESISTANCE vs. VCOM
AND TEMPERATURE
V+ = +12V
V- = 0
TA = +85°C
TA = -40°C
TA = +25°C
0.00001
0.001
0.0001
0.1
0.01
1
10
-40 0 20-20 40 60 80
ON-LEAKAGE CURRENT
vs. TEMPERATURE
MAX4649 toc05
TEMPERATURE (°C)
ON-LEAKAGE (nA)
V+ = +15V
V- = -15V
VCOM = ±10V
DUAL SUPPLIES
0.001
0.0001
0.1
0.01
1
-40 0 20-20 406080
OFF-LEAKAGE CURRENT
vs. TEMPERATURE
MAX4649 toc06
TEMPERATURE (°C)
DUAL SUPPLIES
V+ = +15V
V- = -15V
VCOM = 10V
OFF-LEAKAGE (nA)
VNC OR VNO = ±10V
±
0
-100
0.1 100101 1000
FREQUENCY RESPONSE
MAX4649 toc07
FREQUENCY (MHz)
LOSS (dB)
-90
-80
-70
-60
-50
-40
-30
-20
-10
-110
ON-RESPONSE
OFF-ISOLATION
CROSSTALK
10
30
20
60
50
40
90
80
70
100
-40 10-15 356085
SUPPLY CURRENT
vs. TEMPERATURE
MAX4649 toc09
I+ (µA)
TEMPERATURE (°C)
V+ = +15V
V- = -15V
IN = 5V
I+
20
30
40
50
60
70
80
90
100
0 10203040
MAX4649 toc02
VCOM (V)
RON (Ω)
V+ = +9V
V+ = +12V
V+ = +18V
V+ = +36V
V+ = +30V
V+ = +24V
ON-RESISTANCE vs. VCOM
(SINGLE SUPPLY)
10
15
20
25
30
35
40
45
50
-15 -5-10 0 5 10 15
ON-RESISTANCE vs. VCOM
AND TEMPERATURE
MAX4649 toc03
VCOM (V)
RON (Ω)
V+ = +15V
V- = -15V
TA = +85°C
TA = -40°C
TA = +25°C
MAX4649
45Ω, SPDT Analog Switch in SOT23-8
_______________________________________________________________________________________ 5
20
40
30
60
50
80
70
90
ON-RESISTANCE vs. VCOM
(DUAL SUPPLIES)
MAX4649 toc01
VCOM (V)
RON (Ω)
-20 -10 0 10 20
A: V+ = +8V, V- = -8V
B: V+ = +10V, V- = -10V
C: V+ = +12V, V- = -12V
D: V+ = +15V, V- = -15V
E: V+ = +20V, V- = -20V
A
E
D
C
B
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
Pin Description
PIN NAME FUNCTION
1 COM Analog Switch Common
2 NC Normally Closed Switch Terminal. NC is connected to COM when IN is low.
3 GND Ground
4 V+ Positive Supply Voltage Input
5 N.C. No Connection
6 IN Digital Control Input
7 V- Negative Supply Voltage Input
8 NO Normally Open Switch Terminal. NO is connected to COM when IN is high.
MAX4649
Detailed Description
The MAX4649 is a high-voltage, single-pole/double-
throw (SPDT) analog switch that operates from dual
±4.5V to ±20V supplies or from a single +9V to +36V
supply. The MAX4649 has one normally closed (NC)
switch and one normally open (NO) switch. CMOS
switch construction allows bidirectional processing of
rail-to-rail analog signals.
The MAX4649 has break-before-make switching. The
transition time for switching from one input to the other
is typically 90ns. The off-leakage is typically less than
10pA, and on-leakage is typically less than 20pA.
Applications Information
Overvoltage Protection
Proper power-supply sequencing is recommended for
all CMOS devices. Do not exceed the absolute maxi-
mum ratings, because stresses beyond the listed rat-
ings can cause permanent damage to the devices.
Always sequence V+ on first, then V-, followed by the
logic inputs, NO_, or COM. If power-supply sequenc-
ing is not possible, add two small signal diodes (D1,
D2) in series with supply pins (Figure 1). Adding
diodes reduces the analog signal range to one diode
drop below V+ and one diode drop above V-, but does
not affect the device’s low switch resistance and low
45Ω, SPDT Analog Switch in SOT23-8
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
0.000001
0.0001
0.00001
0.1
0.01
0.001
1
10
100
1000
0231 456 78910111213
SUPPLY CURRENT
vs. LOGIC VOLTAGE
MAX4649 toc10
IN (V)
I+ (µA)
14 15
V+ = +15V
V- = -15V
0
1.5
1.0
0.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
01020 30
LOGIC THRESHOLD
vs. SUPPLY VOLTAGE
MAX4649 toc12
V+ (V)
LOGIC THRESHOLD (V)
MAX4649
45Ω, SPDT Analog Switch in SOT23-8
_______________________________________________________________________________________ 7
leakage characteristics. Device operation is un-
changed, and the difference between V+ and V- should
not exceed 44V. These protection diodes are not rec-
ommended when using a single supply.
Off-Isolation at High Frequencies
In 50Ωsystems, the high-frequency on-response of
these parts extends from DC to above 300MHz, with a
typical loss of -3.6dB. When the switch is turned off,
however, it behaves like a capacitor, and off-isolation
decreases with increasing frequency. This effect is
more pronounced with higher source and load imped-
ances. Above 5MHz, circuit board layout becomes criti-
cal. The graphs shown in the Typical Operating
Characteristics were taken using a 50Ωsource and
load connected with BNC connectors.
tR < 20ns
tF < 20ns
50%
0
VNO
LOGIC
INPUT V-
-V
RL
1000Ω
COM
GND
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
LOGIC
INPUT NC
IN
tTRANS
+3V
tTRANS
VO
VNC
V+
NO
VO
0.9VNC
0.9VNO
SWITCH
OUTPUT
MAX4649
+V
CL
35pF
VNC
VNO
Figure 2. MAX4649 Transition Time
V+
COM
V-
NO_
Vg
V+
D1
D2
V-
Test Circuits/Timing Diagrams
Figure 1. Overvoltage Protection
MAX4649
45Ω, SPDT Analog Switch in SOT23-8
8 _______________________________________________________________________________________
50%
+3V
0
LOGIC
INPUT
SWITCH
OUTPUT
(VOUT)
0.9 ✕ VOUT
tD
LOGIC
INPUT
RL
300Ω
GND
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
NO
IN
NC VOUT
V+
V+
CL
35pF
+3V COM
MAX4649
VGEN GND
NC OR
NO
CL
10nF
VO
V-
V-
V+
VO
IN
OFF ON OFF
∆VO
Q = (∆VO)(CL)
COM
IN DEPENDS ON SWITCH CONFIGURATION;
INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
VIN = +3V
MAX4649
V+
Figure 3. MAX4649 Break-Before-Make Test Circuit
Figure 4. Charge Injection
Test Circuits/Timing Diagrams (continued)
MAX4649
45Ω, SPDT Analog Switch in SOT23-8
_______________________________________________________________________________________ 9
IN VIN
SIGNAL
GENERATOR
V+
C
ANALYZER NC OR NO
RL
GND
COM
C
V-
V-
MAX4649
Figure 5. Off-Isolation
SIGNAL
GENERATOR
V+
C
ANALYZER NO
RL
GND
COM
C
V-
V-
IN
IN
NC 50Ω
MAX4649
V
Figure 7. Channel-Off Capacitance
CAPACITANCE
METER
NC OR NO
COM
GND C
V-
V-
IN VIN
CV+
f = 1MHz
V+
MAX4649
Figure 8. COM On-Capacitance
CAPACITANCE
METER
NC OR NO
COM
GND C
V-
V-
IN VIN
CV+
f = 1MHz
V+
MAX4649
Figure 6. Crosstalk Between Switches
Test Circuits/Timing Diagrams (continued)
Chip Information
TRANSISTOR COUNT: 33
PROCESS TECHNOLOGY: CMOS
MAX4649
45Ω, SPDT Analog Switch in SOT23-8
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.
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Package Information
SOT23, 8L.EPS