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19-1653; Rev 1; 7/00
Fast, Low-Voltage, 2.5, SPST, CMOS Analog Switches
General Description
The MAX4645/MAX4646 single-pole, single-throw (SPST) analog switches feature a 2.5 typical on-resistance (RON) from a +5V supply. RON is flat (0.4 max) over the specified signal range. Each switch can handle Rail-toRail(R) 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 mechanical 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 supply, making them ideal for use in battery-powered applications. The MAX4645/MAX4646 have fast switching speeds of 12ns turn-on time (tON) and 8ns turn-off time (tOFF). 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.
____________________________Features
o +1.8V to +5V Single-Supply Operation o Guaranteed RON 2.5 max (5V supply) 3.5 max (3V supply) o 1.8V Operation RON 30 typ Over Temperature tON 40ns typ, tOFF 20ns typ o Low RON 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
Ordering Information
PART MAX4645EUK-T MAX4645EUT-T MAX4645EUA MAX4646EUK-T MAX4646EUT-T MAX4646EUA TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 5 SOT23-5 6 SOT23-6 8 MAX 5 SOT23-5 6 SOT23-6 8 MAX 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
MAX4645 MAX/SO/DIP SOT23-5
4
IN
GND 3
MAX4646 MAX/SO/DIP SOT23-5
4
IN NOTE: SOT23-5 PACKAGE HAS LETTERING NEAREST PIN 5.
INPUT 0 1
Pin Configurations/Functional Diagrams/ Truth Tables continued at end of data sheet.
SWITCH STATE MAX4646 MAX4645 ON OFF OFF ON
SWITCHES SHOWN FOR LOGIC 0 INPUT.
________________________________________________________________ Maxim Integrated Products
1
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Fast, Low-Voltage, 2.5, SPST, CMOS Analog Switches MAX4645/MAX4646
ABSOLUTE MAXIMUM RATINGS
V+, VIN 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 (TA = +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
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, VIH = 2.4V, VIL = 0.8V, TA = TMIN to TMAX, 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 VIH VIL IIN VIN_ = 0.8V or 2.4V -0.1 0.005 2.4 0.8 0.1 V V A VCOM, VNO, VNC RON ICOM = 10mA, VNO or VNC = 0 to V+, V+ = 4.5V TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX -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 3 0.4 0.6 0.25 nA 0.35 0.25 nA 0.35 0.25 nA 0.35 V SYMBOL CONDITIONS MIN TYP MAX UNITS
ICOM = 10mA, RFLAT(ON) VNO or VNC = 0 to V+, V+ = 4.5V INO(OFF), INC(OFF) VCOM = 1V, 4.5V; VNO or VNC = 4.5V, 1V; V+ = 5.5V
VCOM = 1V, 4.5V; ICOM(OFF) VNO or VNC = 4.5V, 1V; V+ = 5.5V ICOM(ON) V+ = 5.5V; VCOM = 4.5V, 1V; VNO or VNC = 4.5V, 1V, or floating
SWITCH DYNAMIC CHARACTERISTICS Turn-On Time (Note 5) Turn-Off Time (Note 5) tON tOFF VNO, VNC = 3V, RL = 300, CL = 35pF, Figure 2 VNO, VNC = 3V, RL = 300, CL = 35pF, Figure 2 TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 8 12 15 18 10 12 ns ns
2
_______________________________________________________________________________________
Fast, Low-Voltage, 2.5, SPST, CMOS Analog Switches
ELECTRICAL CHARACTERISTICS--Single +5V Supply (continued)
(V+ = 4.5V to 5.5V, VIH = 2.4V, VIL = 0.8V, TA = TMIN to TMAX, unless otherwise specified.) (Notes 2, 3) PARAMETER Charge Injection NO or NC Capacitance COM Off-Capacitance COM On-Capacitance SYMBOL Q COFF CCOM CCOM CONDITIONS VGEN = 2V, CL = 1.0nF, RGEN = 0, Figure 3 VNO , VNC = GND, f = 1MHz, Figure 5 VCOM = GND, f = 1MHz, Figure 5 VCOM = VNO, VNC = GND f = 1MHz, Figure 5 VNO = VNC = 1VRMS, RL = 50, CL = 5pF, f = 10MHz, Figure 4 VNO = VNC = 1VRMS, RL = 50, CL = 5pF, f = 1MHz, Figure 4 RL = 600, 5VP-P, f = 20Hz to 20kHz TA = +25C TA = +25C TA = +25C TA = +25C MIN TYP 5 17 17 38 MAX UNITS pC pF pF pF
MAX4645/MAX4646
TA = +25C
-55
dB
Off-Isolation (Note 7)
VISO
TA = +25C
-75
dB
Total Harmonic Distortion POWER SUPPLY Positive Supply Current
THD
TA = +25C
0.014
%
I+
V+ = 5.5V, VIN = 0 or V+, all channels on or off
TA = +25C TA = TMIN to TMAX
0.0001 1.0
A
ELECTRICAL CHARACTERISTICS--Single +3V Supply
(V+ = 2.7V to 3.3V, VIH = 2.0V, VIL = 0.4V, TA = TMIN to TMAX, 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) VCOM, VNO, VNC RON ICOM = 10mA, VNO or VNC = 0 to V+, V+ = 2.7V TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX -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 4.5 0.9 1 0.25 nA 0.35 0.25 nA 0.35 0.25 nA 0.35 V SYMBOL CONDITIONS MIN TYP MAX UNITS
ICOM = 10mA, RFLAT(ON) VNO or VNC = 0 to V+, V+ = 2.7V INO(OFF), INC(OFF) VCOM = 1V, 3V; VNO or VNC = 3V, 1V; V+ = 3.3V
VCOM = 1V, 3V; ICOM(OFF) VNO or VNC = 3V, 1V; V+ = 3.3V ICOM(ON)
V+ = 3.3V; VCOM = 1V, 3V; TA = +25C VNO or VNC = 1V, TA = TMIN to TMAX 3V or floating
_______________________________________________________________________________________
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Fast, Low-Voltage, 2.5, SPST, CMOS Analog Switches MAX4645/MAX4646
ELECTRICAL CHARACTERISTICS--Single +3V Supply (continued)
(V+ = 2.7V to 3.3V, VIH = 2.0V, VIL = 0.4V, TA = TMIN to TMAX, unless otherwise specified.) (Notes 2, 3) PARAMETER LOGIC INPUT Input Logic High Input Logic Low Logic Input Current VIH VIL IIN VIN_ = 0.4V or 2.0V VNO, VNC = 2.0V, RL = 300, CL = 35pF, Figure 2 VNO, VNC = 2.0V, RL = 300, CL = 35pF, Figure 2 VGEN = 1.5V, CL = 1.0nF, RGEN = 0, Figure 3 VNO, VNC = GND, f = 1MHz, Figure 5 VCOM = GND, f = 1MHz, Figure 5 VCOM = VNO, VNC = GND, f = 1MHz, Figure 5 VNO = VNC = 1VRMS, RL = 50, CL = 5pF, f = 10MHz, Figure 4 VNO = VNC = 1VRMS, RL = 50, CL = 5pF, f = 1MHz, Figure 4 TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = +25C TA = +25C TA = +25C 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 A SYMBOL CONDITIONS MIN TYP MAX UNITS
SWITCH DYNAMIC CHARACTERISTICS Turn-On Time (Note 5) tON
Turn-Off Time (Note 5)
tOFF
Charge Injection NO or NC Capacitance COM Off-Capacitance COM On-Capacitance
Q COFF CCOM CCOM
TA = +25C
-55 dB
Off-Isolation (Note 7)
VISO
TA = +25C
-75
POWER SUPPLY Positive Supply Current I+ V+ = 3.3V, VIN = 0 or V+, all channels on or off TA = +25C TA = TMIN to TMAX 0.0001 1.0 A
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 = 20log10(VCOM / VNO), VCOM = output, VNO = input to off switch.
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_______________________________________________________________________________________
Fast, Low-Voltage, 2.5, SPST, CMOS Analog Switches MAX4645/MAX4646
__________________________________________Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. VCOM AND SUPPLY VOLTAGE
MAX4645/6-01
ON-RESISTANCE vs. VCOM AND TEMPERATURE
MAX4645/6-02
ON/OFF-LEAKAGE CURRENT vs. TEMPERATURE
MAX4645/6-03
12 V+ = 1.8V 10 8 RON ()
2.5
1
2.0
ON/OFF-LEAKAGE (nA)
TA = +85C TA = +25C TA = -40C
6 4 2 V+ = 5V 0 0 1 2 3 4 5 VCOM (V) V+ = 2.5V V+ = 3V
RON ()
1.5
ON-LEAKAGE 0.1 OFF-LEAKAGE
1.0
0.5 V+ = 4.5V 0 0 1 2 3 4 5 VCOM (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. VCOM
7 6 tON/tOFF (ns) 5 4 3 2 tOFF tON
MAX4645/6-06
70 60 SUPPLY CURRENT (nA) 50
12 10 8 6 4 tON tOFF
8
30 20 10 0 -10 0 1
TA = +85C
TA = +25C TA = -40C 2 0 2 3 4 5 -40 -20 0 20 40 60 80 100 SUPPLY VOLTAGE (V) TEMPERATURE (C) VCOM = 3V V+ = 5V
tON/tOFF (ns)
40
1 V+ = 5V 0 1.0 1.5 2.0 2.5 3.0 VCOM (V) 3.5 4.0 4.5 5.0
CHARGE INJECTION vs. VCOM
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 = 600 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 50 IN AND OUT
3
4
5
VCOM (V)
_______________________________________________________________________________________
5
Fast, Low-Voltage, 2.5, SPST, CMOS Analog Switches MAX4645/MAX4646
Pin Description
PIN MAX4645 SOT23-5 1 2 -- 3 4 -- 5 SOT23-6 1 2 -- 3 4 5 6 MAX 1 8 -- 7 6 2, 3, 5 4 SOT23-5 1 -- 2 3 4 -- 5 MAX4646 SOT23-6 1 -- 2 3 4 5 6 MAX 1 -- 8 7 6 2, 3, 5 4 COM NO NC GND IN N.C. V+ Analog Switch Common Terminal Analog Switch Normally Open Terminal Analog Switch Normally Closed Terminal Ground Logic Control Input No Connection. Not internally connected. Positive Supply Voltage NAME FUNCTION
Detailed Description
The MAX4645/MAX4646 are low 2.5 max on-resistance (at V+ = 5V), low-voltage analog switches that operate from a +1.8V to +5.5V single supply. CMOS switch construction allows processing analog signals that are within the supply voltage range (GND to V+).
POSITIVE SUPPLY D1 V+
MAX4645 MAX4646
Applications Information
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, 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 the supply pins for overvoltage protection (Figure 1). Adding these diodes reduces the analog signal by one diode drop below V+ and one diode drop above GND, but does not affect the low switch resistance and low leakage characteristics of the device. Device operation is unchanged, and the difference between V+ and GND should not exceed 6V. Although it is not required, power-supply bypassing improves noise margin and prevents switching noise from propagating from the V+ supply to other components. A 0.1F capacitor, connected from V+ to GND, is adequate for most applications.
Vg
COM
NO
GND D2
Figure 1. Overvoltage Protection Using Two External Blocking Diodes
6
_______________________________________________________________________________________
Fast, Low-Voltage, 2.5, SPST, CMOS Analog Switches MAX4645/MAX4646
Test Circuits/Timing Diagrams
MAX4645 MAX4646
SWITCH V INPUT COM COM
V+ V+ NO RL 300 IN SWITCH OUTPUT VOUT CL 35pF VOUT GND SWITCH OUTPUT 0 t ON 0.9 x V0UT t OFF LOGIC INPUT V+ 50% 0
t r < 5ns t f < 5ns
LOGIC INPUT
0.9 x VOUT
CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL VOUT = VCOM RL + RON
(
)
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE.
Figure 2. Switching Time
V+
MAX4645 MAX4646
RGEN COM
VOUT VOUT NO CL VOUT
V+
V GEN
GND
IN OFF ON Q = (V OUT )(C L ) OFF
VIN
IN
Figure 3. Charge Injection
_______________________________________________________________________________________
7
Fast, Low-Voltage, 2.5, SPST, CMOS Analog Switches MAX4645/MAX4646
_________________________________Test Circuits/Timing Diagrams (continued)
MAX4645 MAX4646
10nF V+
10nF SIGNAL GENERATOR 0dBm
V+
MAX4645 MAX4646
V+
COM
V+ VIL OR VIH
COM
IN ANALYZER RL NO GND
CAPACITANCE METER f = 1MHz
IN NC OR NO GND
VIL OR VIH
Figure 4. Off-Isolation/On-Channel Bandwidth
Figure 5. Channel Off/On-Capacitance
Pin Configurations/Functional Diagrams/Truth Tables (continued)
TOP VIEW
COM 1
6
V+
COM 1
6
V+
COM 1 N.C. 2
8 7 6
NO GND IN
COM 1 N.C. 2 N.C. 3 V+ 4
8 7 6
NC GND IN N.C.
NO 2
5
N.C.
NC 2
5
N.C.
N.C. 3 V+ 4
GND 3
MAX4645 SOT23-6
4
IN
GND 3
MAX4646 SOT23-6
4
IN
5 N.C. MAX4645 MAX/SO/DIP
MAX4646 MAX
5
MAX
PIN 6
6 XYZA
5
4 NOTE: SOT23-6 PACKAGE HAS LETTERING NEAREST PIN 6. INPUT 0 1 SWITCH STATE MAX4646 MAX4645 ON OFF OFF ON N.C. = NOT INTERNALLY CONNECTED
1
2
3
SWITCHES SHOWN FOR LOGIC 0 INPUT.
Chip Information
TRANSISTOR COUNT: 50
8
_______________________________________________________________________________________
Fast, Low-Voltage, 2.5, SPST, CMOS Analog Switches
Package Information
SOT5L.EPS
MAX4645/MAX4646
_______________________________________________________________________________________
9
Fast, Low-Voltage, 2.5, SPST, CMOS Analog Switches MAX4645/MAX4646
Package Information (continued)
6LSOT.EPS
10
______________________________________________________________________________________
Fast, Low-Voltage, 2.5, SPST, CMOS Analog Switches
Package Information (continued)
8LUMAXD.EPS
MAX4645/MAX4646
Note: The MAX4645/MAX4646 do not have an exposed paddle.
______________________________________________________________________________________
11
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.
11 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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