MAXIM MAX4643

19-1656; Rev 1; 2/02
High-Speed, Low-Voltage, 4Ω, Dual SPST
CMOS Analog Switches
Features
The MAX4641 has two normally open (NO) switches,
and the MAX4642 has two normally closed (NC)
switches. The MAX4643 has one NO switch and one NC
switch. All three devices have low 0.35nA leakage currents over the entire temperature range. The MAX4641/
MAX4642/MAX4643 are available in small 8-pin µMAX
and 8-pin QFN packages.
Applications
♦ +1.8V to +5.5V Single-Supply Operation
♦ Rail-to-Rail™ Analog Signal Range
♦ Guaranteed RON
4Ω max (+5V supply)
8Ω max (+3V supply)
♦ +1.8V Operation
RON 30Ω typ Over Temperature
tON 18ns typ, tOFF 12ns typ
♦ Guaranteed RON Flatness: 1Ω (+5V supply)
♦ Guaranteed RON Match Between Channels
0.6Ω (+5V supply)
♦ Low Leakage (<0.35nA) Over Entire Temperature
Range
♦ Excellent AC Characteristics
Low Crosstalk: -97dB at 1MHz
High Off-Isolation: -80dB at 1MHz
0.018% Total Harmonic Distortion
♦ Low Power Consumption: < 0.01µW
Battery-Operated Equipment
Ordering Information
Audio and Video Signal Routing
PART
TEMP RANGE
PIN-PACKAGE
MAX4641EUA
-40°C to +85°C
8 µMAX
MAX4641EGA
-40°C to +85°C
8 QFN 3 x 3
MAX4642EUA
-40°C to +85°C
8 µMAX
MAX4642EGA
-40°C to +85°C
8 QFN 3 x 3
MAX4643EUA
-40°C to +85°C
8 µMAX
MAX4643EGA
-40°C to +85°C
8 QFN 3 x 3
Low-Voltage Data-Acquisition Systems
Sample-and-Hold Circuits
Communications Circuits
Rail-to-Rail is a trademark of Nippon Motorola, Ltd.
Pin Configurations/Functional Diagrams/Truth Tables
TOP VIEW
MAX4641
MAX4642
MAX4643
NO1 1
8
V+
NC1 1
8
V+
NO1 1
8
V+
COM1 2
7
IN1
COM1 2
7
IN1
COM1 2
7
IN1
IN2 3
6
COM2
IN2 3
6
COM2
IN2 3
6
COM2
GND 4
5
NO2
GND 4
5
NC2
GND 4
5
NC2
µMAX
µMAX
µMAX
MAX4641
MAX4642
MAX4643
IN_
NO_
IN_
NC_
IN_
NO1
NC2
0
OFF
0
ON
0
OFF
ON
1
ON
1
OFF
1
ON
OFF
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
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.
1
MAX4641/MAX4642/MAX4643
General Description
The MAX4641/MAX4642/MAX4643 are monolithic, dual,
single-pole/single-throw (SPST) switches that can operate
from a single supply ranging from +1.8V to +5.5V. The
MAX4641/MAX4642/MAX4643 provide low 4Ω on-resistance (RON), 0.6Ω RON matching between channels, and
1Ω RON flatness over the entire analog signal range.
These devices offer fast switching times of less than 20ns
while consuming less than 0.01µW of quiescent power.
MAX4641/MAX4642/MAX4643
High-Speed, Low-Voltage, 4Ω, Dual SPST
CMOS Analog Switches
ABSOLUTE MAXIMUM RATINGS
(All Voltages Referenced to GND)
V+ .............................................................................-0.3V to +6V
IN_, COM_, NO_, NC_ (Note 1)....................-0.3V to (V+ + 0.3V)
Continuous Current (any terminal)....................................±20mA
Continuous Current (NO_, NC_, COM_)...........................±50mA
Peak Current (NO_, NC_, COM_, pulsed at 1ms,
10% duty cycle)........................................................ ±100mA
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C) ........... 362mW
8-Pin QFN (derate 24.4mW/°C above +70°C) ......... 1951mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................ +300°C
Note 1: Signals on NO_, NC_, COM_, or IN_ exceeding V+ or GND 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—Single +5V Supply
(V+ = +4.5V to +5.5V, VINH = 2.4V, VINL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V+
V
ANALOG SWITCH
Analog Signal Range
On-Resistance
VCOM_,
VNO_,
VNC_
RON
0
V+ = 4.5V,
ICOM_ = 10mA, VNO_
or VNC_= 0 to V+
TA = +25°C
V+ = 4.5V, ICOM_ =
10mA, VNO_ or
VNC_ = 0 to V+
TA = +25°C
V+ = 4.5V, ICOM_ =
10mA, VNO_ or
VNC_ = 0 to V+
TA = +25°C
2.5
4
Ω
TA = TMIN to TMAX
5
On-Resistance Match
Between Channels
(Notes 2, 8)
∆RON
On-Resistance Flatness
(Note 3)
RFLAT
NO_, NC_ Off-Leakage
Current (Note 4)
INO_(OFF),
INC_(OFF)
V+ = 5.5V, VCOM_ =
1V or 4.5V, VNO_ or
VNC_ = 4.5V or 1V
TA = +25°C
-0.25
TA = TMIN to TMAX
-0.35
COM_ Off-Leakage Current
(Note 4)
V+ = 5.5V, VCOM_ =
1V or 4.5V, VNO_ or
VNC_ = 4.5V or 1V
TA = +25°C
-0.25
ICOM_(OFF)
TA = TMIN to TMAX
-0.35
COM_ On-Leakage Current
(Notes 4, 5)
ICOM_(ON)
V+ = 5.5V, VCOM_ =
1V or 4.5V
TA = +25°C
-0.25
TA = TMIN to TMAX
-0.35
0.2
0.6
Ω
TA = TMIN to TMAX
0.8
0.85
1
Ω
TA = TMIN to TMAX
1.5
0.01
0.25
nA
0.35
0.01
0.25
nA
0.35
0.01
0.25
0.35
nA
DIGITAL INPUTS
INPUTS
IN_ Input Logic High
VIH
IN_ Input Logic Low
VIL
IN_ Input Current
IIN
2
2.4
VIN_ = 0.8V or 2.4V
-0.1
V
0.005
_______________________________________________________________________________________
0.8
V
0.1
µA
High-Speed, Low-Voltage, 4Ω, Dual SPST
CMOS Analog Switches
(V+ = +4.5V to +5.5V, VINH = 2.4V, VINL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
9
15
UNITS
DYNAMIC
Turn-On Time (Note 4)
Turn-Off Time (Note 4)
Break-Before-Make (Note 4)
(MAX4643 only)
Charge Injection
tON
tOFF
tBBM
RL = 300Ω, CL =
35pF, VNO_ = VNC_ =
3V, Figure 2
TA = +25°C
RL = 300Ω, CL =
35pF, VNO_ = VNC_ =
3V, Figure 2
TA = +25°C
RL = 300Ω,
CL = 35pF, VNO_ =
VNC_ = 3V, Figure 2
ns
TA = TMIN to TMAX
18
5
8
ns
TA = TMIN to TMAX
10
TA = +25°C
7
ns
TA = TMIN to TMAX
1
Q
VGEN = 0, RGEN = 0, CL = 1nF, Figure 4
2
pC
NO_, NC_ Off-Capacitance
CNO_ (OFF),
CNC_ (OFF)
NO_ or NC_ = GND, f = 1MHz, Figure 5
7
pF
COM_ Off-Capacitance
CCOM_ (OFF)
f = 1MHz, Figure 5
7
pF
Switch On-Capacitance
C(ON)
f = 1MHz, Figure 5
18
pF
Off-Isolation (Note 6)
VISO
CL = 5pF, RL = 50Ω,
Figure 3
f = 10MHz
-56
f = 1MHz
-80
Crosstalk (Note 7)
VCT
CL = 5pF, RL = 50Ω,
Figure 3
f = 10MHz
-77
f = 1MHz
-97
Total Harmonic Distortion
THD
RL = 600Ω, 0.5Vp-p, f = 20Hz to 20kHz
0.018
V+ = 5.5V, VIN_ = 0 or V+
0.001
SUPPLY
Positive Supply Current
I+
dB
dB
%
1.0
µA
ELECTRICAL CHARACTERISTICS—Single +3V Supply
(V+ = +2.7V to +3.3V, VINH = 2.0V, VINL = 0.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V+
V
ANALOG SWITCH
Analog Signal Range
On-Resistance
VCOM_,
VNO_,
VNC_
RON
On-Resistance Match
Between Channels
(Notes 2, 8)
∆RON
On-Resistance Flatness
(Note 3)
RFLAT
0
V+ = 2.7V, ICOM_ =
10mA, VNO_ or
VNC_ = 0 to V+
TA = +25°C
V+ = 2.7V, ICOM_ =
10mA, VNO_ or
VNC_ = 0 to V+
TA = +25°C
V+ = 2.7V, ICOM_ =
10mA, VNO_ or
VNC_ = 0 to V+
TA = +25°C
6
Ω
TA = TMIN to TMAX
9
0.2
0.6
Ω
TA = TMIN to TMAX
TA = TMIN to TMAX
8
0.8
1.5
3.0
Ω
3.5
_______________________________________________________________________________________
3
MAX4641/MAX4642/MAX4643
ELECTRICAL CHARACTERISTICS—Single +5V Supply (continued)
MAX4641/MAX4642/MAX4643
High-Speed, Low-Voltage, 4Ω, Dual SPST
CMOS Analog Switches
ELECTRICAL CHARACTERISTICS—Single +3V Supply (continued)
(V+ = +2.7V to +3.3V, VINH = 2.0V, VINL = 0.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DIGITAL INPUTS
IN_ Input Logic High
VIH
2.0
IN_ Input Logic Low
VIL
IN_ Input Current
IIN
VIN_ = 0.4V or 2.0V
RL = 300Ω, CL =
35pF, VNO_ =
VNC_ = 2V, Figure 2
TA = +25°C
tON
RL = 300Ω, CL =
35pF, VNO_ =
VNC_ = 2V, Figure 2
TA = +25°C
RL = 300Ω, CL =
35pF, VNO_ =
VNC_ = 2V, Figure 2
TA = +25°C
-0.1
V
0.4
V
0.005
0.1
µA
14
20
DYNAMIC
Turn-On Time (Note 4)
Turn-Off Time (Note 4)
Break-Before-Make (Note 4)
(MAX4643 only)
Charge Injection
tOFF
tBBM
ns
TA = TMIN to TMAX
22
6
10
ns
TA = TMIN to TMAX
11
7
ns
TA = TMIN to TMAX
1
Q
VGEN = 0, RGEN = 0, CL = 1nF, Figure 4
2
pC
NO_, NC_ Off-Capacitance
CNO_(OFF),
CNC_(OFF)
NO_ or NC_ = GND, f = 1MHz, Figure 5
7
pF
COM_ Off-Capacitance
CCOM_(OFF)
f =1MHz, Figure 5
7
pF
Switch On-Capacitance
C(ON)
f =1MHz, Figure 5
18
pF
Off-Isolation (Note 6)
VISO
CL = 5pF, RL = 50Ω,
Figure 3
f = 10MHz
-56
f = 1MHz
-80
Crosstalk (Note 7)
VCT
CL = 5pF, RL = 50Ω,
Figure 3
f = 10MHz
-77
f = 1MHz
-97
dB
dB
SUPPLY
Positive Supply Current
I+
V+ = 3.3V, VIN_ = 0 or V+
0.001
1.0
µA
Note 2: ∆RON = RON(MAX) - RON(MIN).
Note 3: RON Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the
specified analog signal range.
Note 4: Guaranteed by design.
Note 5: On-Leakage performed with voltage applied to COM_, with NO_ and NC_ left floating.
Note 6: Off-Isolation = 20log10 (VO_ / VI_), where VO is VCOM_ and VI is VNC_ or VNO_ from the network analyzer.
Note 7: Crosstalk is measured between the two switches.
Note 8: RON and ∆RON matching specifications for QFN-packaged parts are guaranteed by design.
4
_______________________________________________________________________________________
High-Speed, Low-Voltage, 4Ω, Dual SPST
CMOS Analog Switches
ICOM = 10mA
10
V+ = 2.5V
V+ = 3.0V
5
V+ = 3V
LEAKAGE (pA)
RON (Ω)
4
1000
MAX4641/2/3toc02
ICOM = 10mA
V+ = 1.8V
15
RON (Ω)
5
MAX4641/2/3toc01
20
ON-/OFF-LEAKAGE CURRENT
vs. TEMPERATURE
ON-RESISTANCE vs. TEMPERATURE
MAX4641/2/3toc03
ON-RESISTANCE vs. VCOM
3
IN = V+
100
10
V+ = 5V
2
IN = GND
V+ = 5V
0
1
0
2
3
4
5
1
-40
-15
10
35
60
85
-40
-15
10
35
60
VCOM (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
CHARGE INJECTION vs. VCOM
SUPPLY CURRENT vs. SUPPLY VOLTAGE
LOGIC THRESHOLD
vs. SUPPLY VOLTAGE
45
30
100
80
60
40
85
MAX4641/2/3toc06
IN = GND
120
SUPPLY CURRENT (nA)
60
2.0
LOGIC THRESHOLD (V)
V+ = 5V
MAX4641/2/3toc05
140
TOC4641/2/3toc04
CHARGE INJECTION (pC)
75
1
1.5
1.0
0.5
15
20
IN = V+
0
0
1
2
3
4
0
VCOM (V)
2.8
3.8
4.8
SUPPLY VOLTAGE (V)
SWITCHING TIMES vs. SUPPLY VOLTAGE
SWITCHING TIMES vs. TEMPERATURE
1.8
9
6
6
4
2
3
4
SUPPLY VOLTAGE (V)
5
300
4.2
5.0
IN = GND
250
5.8
200
V+ = 5V
150
100
V+ = 3V
V+ = 1.8V
50
0
0
3.4
SUPPLY CURRENT
vs. TEMPERATURE
2
3
2.6
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (nA)
8
SWITCHING TIMES (ns)
12
1.8
5.8
TOC4641/2/3toc08
10
TOC4641/2/3toc07
15
SWITCHING TIMES (ns)
5
TOC4641/2/3toc09
0
0
-40
-15
10
35
TEMPERATURE (°C)
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
_______________________________________________________________________________________
5
MAX4641/MAX4642/MAX4643
Typical Operating Characteristics
(V+ = +5V or +3V, VINH = V+, VINL = GND, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(V+ = +5V or +3V, VINH = V+, VINL = GND, TA = +25°C, unless otherwise noted.)
-20
OFF-ISOLATION
CROSSTALK (dB)
-20
-40
-50
-60
-40
V+ = 5V
0.04
THD (%)
ON-LOSS
0.05
MAX4641/2/3toc11
V+ = 5V
-30
0
MAX4641/2/3toc10
0
-10
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
CROSSTALK vs. FREQUENCY
MAX4641/2/3toc12
FREQUENCY RESPONSE
(dB/div)
MAX4641/MAX4642/MAX4643
High-Speed, Low-Voltage, 4Ω, Dual SPST
CMOS Analog Switches
0.03
-60
0.02
-80
0.01
-70
-80
-90
-100
0.01
0.1
1
10
100
1000
-100
0.01
0.1
1
10
0
0.01
100
FREQUENCY (MHz)
FREQUENCY (MHz)
0.1
1
10
100
FREQUENCY (kHz)
Pin Description
PIN
NAME
FUNCTION
MAX4641
MAX4642
MAX4643
1, 5
–
–
NO1, NO2
Analog Switch Normally Open Terminals
–
1, 5
–
NC1, NC2
Analog Switch Normally Closed Terminals
–
–
1
NO1
Analog Switch Normally Open Terminal
–
–
5
NC2
Analog Switch Normally Closed Terminal
2, 6
2, 6
2, 6
COM1, COM2
3, 7
3, 7
3, 7
IN2, IN1
4
4
4
GND
8
8
8
V+
Analog Switch Common Terminals
Logic-Controlled Inputs
Ground
Positive Supply Input. Bypass with a 0.1µF capacitor to GND.
Note: NO_, NC_, and COM_ pins are identical and interchangeable. Signals can be passed through either side of these bidirectional
switches. However, the typical off-capacitances differ, as shown in the Electrical Characteristics.
6
_______________________________________________________________________________________
High-Speed, Low-Voltage, 4Ω, Dual SPST
CMOS Analog Switches
TOP VIEW
MAX4641
MAX4642
MAX4643
NO1 1
8
V+
NC1 1
8
V+
NO1 1
8
V+
COM1 2
7
IN1
COM1 2
7
IN1
COM1 2
7
IN1
IN2 3
6
COM2
IN2 3
6
COM2
IN2 3
6
COM2
GND 4
5
NO2
GND 4
5
NC2
GND 4
5
NC2
QFN
QFN
MAX4641
QFN
MAX4642
MAX4643
IN_
NO_
IN_
NC_
IN_
NO1
NC2
0
OFF
0
ON
0
OFF
ON
1
ON
1
OFF
1
ON
OFF
Applications Information
V+
NO_, NC_
COM
GND
Figure 1. Overvoltage Protection Using External Blocking
Diodes
exceeds V+ or GND (Figure 1). Virtually all of the analog leakage current comes from the ESD diodes to V+
or GND. Although the ESD diodes on a given signal pin
are identical, and therefore fairly well balanced, they
are reverse biased differently. Each is biased by either
V+ or GND and the analog signal. This means their
leakages will vary as the signal varies. The difference in
the two diode leakages to the V+ and GND pins constitutes the analog-signal-path leakage current. All analog
leakage current flows between each pin and one of the
supply terminals, not to the other switch terminal. This
is why both sides of a given switch can show leakage
currents of the same or opposite polarity.
There is no normal current path between the analogsignal paths and V+ or GND. V+ and GND also power
the internal logic and logic-level translators. The logiclevel translators convert the logic level into switched V+
and GND signals to drive the analog signal gates.
The MAX4641/MAX4642/MAX4643 operate from a single supply ranging from +1.8V to +5.5V. The devices
are guaranteed to be functional over that supply range,
but TTL/CMOS compatibility is only valid for operation
using a +5V supply. All voltage levels are referenced to
GND. Positive and negative DC analog inputs or AC
signals can be accommodated by shifting V+ and
GND.
ESD-protection diodes are internally connected between each analog-signal pin and both V+ and GND.
One of these diodes conducts if any analog signal
_______________________________________________________________________________________
7
MAX4641/MAX4642/MAX4643
Pin Configurations/Functional Diagrams/Truth Tables (continued)
MAX4641/MAX4642/MAX4643
High-Speed, Low-Voltage, 4Ω, Dual SPST
CMOS Analog Switches
V+
OPEN
V+
NO_
NO_
VNO_
IN_
50%
VNO_
VCOM_
COM_
90%
VCOM_
50Ω
50%
0
MAX4641
IN_
tR < 5ns
tF < 5ns
VIH + 0.5V
300Ω
GND
90%
0
35pF
tON
tOFF
V+
OPEN
V+
NC_
NC_
VIH + 0.5V
VNC_
IN_
MAX4642
IN_
VCOM_
COM_
50Ω
50%
50%
0
300Ω
GND
35pF
VNC_
VCOM_
0
90%
tOFF
90%
tON
V+
VS
V+
NC_
NO_
VIH + 0.5V
VS
IN_
0
MAX4643
IN_
50Ω
GND
VS
VCOM_
COM_
300Ω
35pF
90%
90%
VCOM_
0
tBBM
tBBM = tON(NO_) - tOFF(NC_)
OR
tBBM = tON(NC_) - tOFF(NO_)
Figure 2. Switching Times
8
_______________________________________________________________________________________
tBBM
High-Speed, Low-Voltage, 4Ω, Dual SPST
CMOS Analog Switches
V+
0.1µF
NO_
OR
NC_
VIN
NETWORK
ANALYZER
50Ω
50Ω
*
MAX4641
MAX4642
MAX4643 COM_
V+
MAX4641/MAX4642/MAX4643
V+
VOUT
MEAS
REF
IN_
GND
50Ω
MEASUREMENTS ARE STANDARDIZED AGAINST
SHORT AT SOCKET TERMINALS. OFF-ISOLATION IS
MEASURED BETWEEN COM AND “OFF” TERMINAL
ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN
COM AND “ON” TERMINAL ON EACH SWITCH. SIGNAL
DIRECTION THROUGH SWITCH IS REVERSED; WORST
VALUES ARE RECORDED.
50Ω
V
OFF-ISOLATION = 20log OUT
VIN
VOUT
ON-LOSS = 20log
VIN
* ADD 50Ω TERMINATION FOR
OFF-ISOLATION
Figure 3. Off-Isolation, On-Loss, and Crosstalk
V+
V+
V+
VIN
IN_
NO_
OR
NC_
VNO_ OR VNC_ = 0V
V+
MAX4641
MAX4642
MAX4643 COM_
GND
50Ω
VOUT
CL
1000pF
AS
REQUIRED
NO_
OR
NC_
MAX4641
MAX4642
IN_ MAX4643 COM_
1MHz
CAPACITANCE
ANALYZER
GND
V+
VIN
0
MAX4641
VOUT
Figure 5. NO_, NC_, and COM_ Capacitance
MAX4642
∆VOUT
∆VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER
ERROR Q WHEN THE CHANNEL TURNS OFF.
Chip Information
TRANSISTOR COUNT: 105
Q = ∆VOUT x CL
Figure 4. Charge Injection
_______________________________________________________________________________________
9
High-Speed, Low-Voltage, 4Ω, Dual SPST
CMOS Analog Switches
8LUMAXD.EPS
MAX4641/MAX4642/MAX4643
Package Information
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
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.