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19-1906; Rev 0; 2/01
45, SPDT Analog Switch in SOT23-8
General Description
The MAX4649 is a dual-supply, single-pole/doublethrow (SPDT) analog switch. On-resistance is 45 max and flat (7 max) over the specified signal range. The MAX4649 can handle Rail-to-Rail(R) 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 routing of signals in telecommunications and test equipment. The MAX4649 features a switch transition time of 130ns max at +25C, and a guaranteed break-before-make switching time of 5ns. Off-leakage current is only 2nA max at +25C. The MAX4649 is available in a tiny 8-pin SOT23 package.
Features
o Low On-Resistance 45 max 15V Supplies o 5 max RON Match Between Channels o Guaranteed RON Flatness Over Specified Signal Range (7 max) o VL Logic Supply Not Required o Rail-to-Rail Signal Handling o +9V to +36V Single Supply Operation o 4.5V to 20V Dual Supply Operation o Low Crosstalk: -92dB at 1MHz o High Off-Isolation: -92dB at 1MHz o TTL/CMOS-Compatible Control Inputs
MAX4649
Applications
PBX, PABX Systems Communication Systems DSL Test Equipment Avionics Audio Systems Redundant Systems Relay Replacement PC Multimedia Boards
PART MAX4649EKA-T
Ordering Information
TEMP. RANGE -40C to +85C PINPACKAGE 8-SOT23 TOP MARK AAIE
Pin Configuration
TOP VIEW
COM NC GND
1 2 3
8 7 6 5
NO VIN N.C.
V+ 4
MAX4649 Rail-to-Rail is a registered trademark of Nippon Motorola, Inc.
LOGIC 0 1
SOT23-8
NO OFF ON NC ON OFF
________________________________________________________________ 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.
45, SPDT Analog Switch in SOT23-8 MAX4649
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND.) 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 = +70C) 8-Pin SOT23 (derate 8.9mW/C above +70C)...........714mW Operating Temperature Range MAX4649EKA ............................................-40C to +85C Storage Temperature Range .............................-65C to +150C Junction Temperature ......................................................+150C Lead Temperature (soldering, 10s) .................................+300C
Note 1: Signals on NO, NC, COM, or IN exceeding V+ or V- 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--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 = +25C.) (Notes 2, 3)
PARAMETER ANALOG SWITCH Analog Signal Range VNO, VNC, VCOM RON RON RFLAT
(ON)
SYMBOL
CONDITIONS
TA
MIN
TYP
MAX
UNITS
VICOM = 1mA; VNO or VNC = 10V ICOM = 1mA; VNO or VNC = 10V ICOM = 1mA; VNO or VNC = +5V, 0, -5V VCOM = -14V, +14V; VNO or VNC = +14V, -14V VCOM = +14V, -14V; VNO or VNC = +14V, -14V or floating +25C TMIN to TMAX +25C TMIN to TMAX +25C TMIN to TMAX +25C TMIN to TMAX +25C TMIN to TMAX -2 -10 -4 -20 0.01 1.5 0.6 33
V+ 45 60 5 6 7 10 2
V
On-Resistance On-Resistance Matching Between Channels On-Resistance Flatness (Note 4) NO or NC Off-Leakage Current

INO(OFF) or INC(OFF)
nA 10 4 nA 20
COM On-Leakage Current DIGITAL I/O Input Logic High Voltage Input Logic Low Voltage Input Leakage
ICOM(ON)
VIH VIL IIN VIN = 0 or +5V
2.4 0.8 -1 1
V V A
2
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45, SPDT Analog Switch in SOT23-8
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 = +25C.) (Notes 2, 3)
PARAMETER DYNAMIC CHARACTERISTICS Transition Time tTRANS VNO or VNC = 10V; RL = 1k; CL = 35pF; Figure 2 VNO or VNC = 10V; RL = 300; CL = 35pF; Figure 3 VGEN = 0; RGEN = 0; CL = 1nF; Figure 4 f = 1MHz, RL = 50, CL = 5pF, VCOM = 1VRMS; Figure 5 f = 1MHz, RL = 50, CL = 5pF; Figure 6 THD CNO(OFF), CNC(OFF) CCOM(ON) f = 20Hz to 20kHz, RL = 600, 5VRMS f = 1MHz; Figure 7 f = 1MHz; Figure 8 4.5 VIN = 5V Positive Supply Current I+ VIN = 0 or V+ Negative Supply Current IVIN = 0 or 5V +25C TMIN to TMAX +25C TMIN to TMAX +25C TMIN to TMAX 0.01 0.01 38 +25C TMIN to TMAX +25C TMIN to TMAX 5 2 10 ns 90 130 ns 170 SYMBOL CONDITIONS TA MIN TYP MAX UNITS
MAX4649
Break-Before-Make Delay
tD
Charge Injection
Q
2
pC
Off-Isolation
VISO
92
dB
Crosstalk Total Harmonic Distortion VNO or VNC Off-Capacitance COM On-Capacitance POWER SUPPLY Power-Supply Range
92 0.015 6 17 20 75 100 1 10 1 10 A A % pF pF V
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3
45, SPDT Analog Switch in SOT23-8 MAX4649
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 = +25C.) (Notes 2, 3)
PARAMETER ANALOG SWITCH Analog Signal Range VNO, VNC, VCOM RON RON ICOM = 1mA; VNO or VNC = +10V ICOM = 1mA; VNO or VNC = +10V ICOM = 1mA; VNO or VNC = +2V, +6V, +10V +25C TMIN to TMAX +25C TMIN to TMAX +25C TMIN to TMAX 9 0.7 0 68 V+ 90 115 6 7 17 23 V SYMBOL CONDITIONS TA MIN TYP MAX UNITS
On-Resistance On-Resistance Matching Between Channels On-Resistance Flatness (Note 4) DYNAMIC

RFLAT (ON)
Transition Time
tTRANS
VNO or VNC = 0, 10V or 10V, 0; RL = 1k; CL = 35pF; Figure 2 VNO or VNC = +10V; RL = 300; CL = 35pF; Figure 3 VGEN = 0; RGEN = 0; CL = 1nF; Figure 4
+25C
116
165 ns
TMIN to TMAX +25C TMIN to TMAX +25C 1 1 1 36
200
Break-Before-Make Delay
tD
ns
Charge Injection POWER SUPPLY Power Supply Range
Q
pC
9 VIN = +5V +25C TMIN to TMAX +25C TMIN to TMAX 0.01 22
36 40 50 1 10
V
Positive Supply Current
I+ VIN = 0 or V+
A
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 +25C. 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.
4
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45, SPDT Analog Switch in SOT23-8
Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. VCOM (DUAL SUPPLIES)
MAX4649 toc01
MAX4649
ON-RESISTANCE vs. VCOM (SINGLE SUPPLY)
MAX4649 toc02
ON-RESISTANCE vs. VCOM AND TEMPERATURE
45 40 TA = +85C TA = +25C
MAX4649 toc03
90 80 70 RON () 60 50 40 30 20 -20 -10 0 VCOM (V) 10 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 B C D E
100 90 80 RON () V+ = +9V
50
60 50 40 30
RON ()
70
V+ = +12V
35 30 25 20 V+ = +15V 15 V- = -15V -15 -10 -5
V+ = +18V V+ = +24V V+ = +30V
TA = -40C
V+ = +36V 20 20 0 10 20 VCOM (V) 30 40 10
0 VCOM (V)
5
10
15
ON-RESISTANCE vs. VCOM AND TEMPERATURE
MAX4649 toc04
ON-LEAKAGE CURRENT vs. TEMPERATURE
V+ = +15V V- = -15V VCOM = 10V
MAX4649 toc05
OFF-LEAKAGE CURRENT vs. TEMPERATURE
V+ = +15V V- = -15V VCOM = 10V VNC OR VNO = 10V
MAX4649 toc06
100 V+ = +12V 90 80 RON () 70 TA = +25C 60 50 40 30 0 5 VCOM (V) 10 TA = -40C V- = 0 TA = +85C
10 1 ON-LEAKAGE (nA) 0.1 0.01 0.001 0.0001 0.00001 DUAL SUPPLIES
1
0.1 OFF-LEAKAGE (nA)
0.01 DUAL SUPPLIES 0.001
0.0001 -40 -20 0 20 40 60 80 -40 -20 0 20 40 60 80 TEMPERATURE (C) TEMPERATURE (C)
15
FREQUENCY RESPONSE
MAX4649 toc07
TOTAL HARMONIC DISTORTION vs. FREQUENCY
MAX4649 toc08
SUPPLY CURRENT vs. TEMPERATURE
90 80 70 I+ (A) 60 50 40 I+ V+ = +15V V- = -15V IN = 5V
MAX4649 toc09
0 -10 -20 -30 LOSS (dB) -40 -50 -60 -70 -80 -90 -100 -110 0.1
100 10 DISTORTION (%) 1 0.1 SIGNAL DISTORTION 0.01 0.001 0.0001 MEASUREMENT LIMITS V+ = +15V V- = -15V 5VRMS SIGNAL 600 SOURCE AND LOAD
100
ON-RESPONSE
OFF-ISOLATION CROSSTALK
30 20 10
1
10 FREQUENCY (MHz)
100
1000
10
100
1k FREQUENCY (Hz)
10k
100k
-40
-15
10 35 60 TEMPERATURE (C)
85
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5
45, SPDT Analog Switch in SOT23-8 MAX4649
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. LOGIC VOLTAGE
MAX4649 toc10
CHARGE INJECTION vs. VCOM
MAX4649 toc11
LOGIC THRESHOLD vs. SUPPLY VOLTAGE
4.5 4.0 LOGIC THRESHOLD (V) 3.5 3.0 2.5 2.0 1.5 1.0
MAX4649 toc12
1000 100 10 1 I+ (A) 0.1 0.01 0.001 0.0001 0.00001 0.000001 V+ = +15V V- = -15V
40 30 20 CHARGE (pC) 10 0 -10 -20 -30 -40 A B A: V+ = +15V, V- = -15V B: V+ = +12V, V- = 0
5.0
0.5 0 -15 -10 -5 0 VCOM (V) 5 10 15 0 10 20 V+ (V) 30
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 IN (V)
Pin Description
PIN 1 2 3 4 5 6 7 8 NAME COM NC GND V+ N.C. IN VNO Analog Switch Common Normally Closed Switch Terminal. NC is connected to COM when IN is low. Ground Positive Supply Voltage Input No Connection Digital Control Input Negative Supply Voltage Input Normally Open Switch Terminal. NO is connected to COM when IN is high. FUNCTION
Detailed Description
The MAX4649 is a high-voltage, single-pole/doublethrow (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 maximum ratings, because stresses beyond the listed ratings 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 sequencing 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
6
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45, SPDT Analog Switch in SOT23-8
leakage characteristics. Device operation is unchanged, and the difference between V+ and V- should not exceed 44V. These protection diodes are not recommended when using a single supply. however, it behaves like a capacitor, and off-isolation decreases with increasing frequency. This effect is more pronounced with higher source and load impedances. Above 5MHz, circuit board layout becomes critical. The graphs shown in the Typical Operating Characteristics were taken using a 50 source and load connected with BNC connectors.
MAX4649
Off-Isolation at High Frequencies
In 50 systems, 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,
Test Circuits/Timing Diagrams
V+
D1 V+
NO_ COM Vg
VD2
V-
Figure 1. Overvoltage Protection
MAX4649
+V LOGIC INPUT +3V 50% 0 t R < 20ns t F < 20ns NC V+ COM NO IN LOGIC INPUT GND V-V CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL 1000 CL 35pF VO
VNC VNO
t TRANS SWITCH OUTPUT VNO VO 0.9V NO V NC
t TRANS 0.9V NC
Figure 2. MAX4649 Transition Time
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7
45, SPDT Analog Switch in SOT23-8 MAX4649
Test Circuits/Timing Diagrams (continued)
MAX4649
V+ V+ LOGIC INPUT COM NO IN RL 300 GND CL 35pF SWITCH OUTPUT (VOUT) VOUT
+3V 50% 0
+3V
NC
LOGIC INPUT
0.9 VOUT tD
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
Figure 3. MAX4649 Break-Before-Make Test Circuit
V+ VO COM VO V GEN IN OFF ON Q = (V O )(C L ) IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH. OFF VVIN = +3V GND V+ NC OR NO V-
MAX4649
VO CL 10nF
Figure 4. Charge Injection
8
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45, SPDT Analog Switch in SOT23-8
Test Circuits/Timing Diagrams (continued)
MAX4649
MAX4649
C SIGNAL GENERATOR COM
V+
C
V+
MAX4649
V+ COM VIN CAPACITANCE METER NC OR NO GND RL VVC f = 1MHz GND VC
IN ANALYZER NC OR NO
IN
V IN
V-
Figure 5. Off-Isolation
Figure 7. Channel-Off Capacitance
C
V+
MAX4649
50
C
V+
MAX4649
SIGNAL GENERATOR
COM
NC
V+ COM CAPACITANCE METER IN f = 1MHz V IN
VIN ANALYZER RL
IN
NO GND VC
NC OR NO GND VC
V-
V-
Figure 6. Crosstalk Between Switches
Figure 8. COM On-Capacitance
Chip Information
TRANSISTOR COUNT: 33 PROCESS TECHNOLOGY: CMOS
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9
45, SPDT Analog Switch in SOT23-8 MAX4649
Package Information
SOT23, 8L.EPS
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 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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