_______________General Description
The MAX320/MAX321/MAX322 are precision, dual,
SPST analog switches designed to operate from ±3V to
±8V dual supplies. The MAX320 has two normally open
(NO) switches and the MAX321 has two normally
closed (NC) switches. The MAX322 has one NO and
one NC switch. Low power consumption (1.25mW)
makes these parts ideal for battery-powered equip-
ment. They offer low leakage currents (100pA max) and
fast switching speeds (tON = 150ns max, tOFF = 100ns
max).
The MAX320 series, powered from ±5V supplies, offers
35Ωmax on-resistance (RON), 2Ωmax matching
between channels, and 4Ωmax RON flatness.
These switches also offer 5pC max charge injection
and a minimum of 2000V ESD protection per Method
3015.7.
For equivalent devices specified for single-supply oper-
ation, see the MAX323/MAX324/MAX325 data sheet.
For quad versions of these switches, see the
MAX391/MAX392/MAX393 data sheet.
________________________Applications
Battery-Operated Systems Sample-and-Hold Circuits
Heads-Up Displays Guidance and Control Systems
Audio and Video Switching Military Radios
Test Equipment Communications Systems
±5V DACs and ADCs PBX, PABX
____________________________Features
♦Low On-Resistance, 35Ωmax (16Ωtypical)
♦RON Matching Between Channels <2Ω
♦RON Flatness <4Ω
♦Guaranteed Charge Injection <5pC
♦Bipolar Supply Operation (±3V to ±8V)
♦Low Power Consumption, <1.25mW
♦Low Leakage Current Over Temperature,
<2.5nA at +85°C
♦Fast Switching, tON <150ns, tOFF <100ns
♦Guaranteed Break-Before-Make (MAX322 only)
______________Ordering Information
MAX320/MAX321/MAX322
Precision, Dual-Supply, SPST
Analog Switches
________________________________________________________________
Maxim Integrated Products
1
SWITCHES SHOWN FOR LOGIC "0" INPUT
MAX321
LOGIC SWITCH
0
1ON
OFF
TOP VIEW
DIP/SO/µMAX
MAX320
LOGIC SWITCH
0
1OFF
ON
MAX322
LOGIC SWITCH 1
0
1OFF
ON
SWITCH 2
ON
OFF
8
7
6
5
1
2
3
4
V+
IN1
COM2
NO2
V-
IN2
COM1
NO1
MAX320
DIP/SO/µMAX
8
7
6
5
1
2
3
4
V+
IN1
COM2
NC2
V-
IN2
COM1
NC1
MAX321
DIP/SO/µMAX
8
7
6
5
1
2
3
4
V+
IN1
COM2
NC2
V-
IN2
COM1
NO1
MAX322
_____________________Pin Configurations/Functional Diagrams/Truth Tables
Call toll free 1-800-998-8800 for free samples or literature.
19-0350; Rev 0; 12/94
Ordering Information continued at end of data sheet.
* Contact factory for dice specifications.
** Contact factory for availability.
8 CERDIP**-55°C to +125°CMAX320MJA 8 CERDIP**-40°C to +85°CMAX320EJA 8 SO-40°C to +85°CMAX320ESA 8 Plastic DIP-40°C to +85°CMAX320EPA Dice*0°C to +70°CMAX320C/D
8 SO0°C to +70°CMAX320CSA 8 Plastic DIP0°C to +70°C
MAX320CPA PIN-PACKAGETEMP. RANGEPART
8 µMAX0°C to +70°CMAX320CUA
Voltage Referenced to V-
V+................................................................(V- - 0.3V) to +17V
IN_, COM_, NC_, NO_ (Note 1).........(V- - 0.3V) to (V+ + 0.3V)
Continuous Current (any terminal)......................................30mA
Peak Current, COM_, NO_, NC_
(pulsed at 1ms, 10% duty cycle max) ..............................100mA
ESD per Method 3015.7 ..................................................>2000V
Continuous Power Dissipation
Plastic DIP (derate 9.09mW/°C above +70°C) .............727mW
Narrow SO (derate 5.88mW/°C above +70°C) .............471mW
µMAX (derate 4.10mW/°C above +70°C) .....................330mW
CERDIP (derate 8.00mW/°C above +70°C)..................640mW
Operating Temperature Ranges
MAX32_C_ _ ........................................................0°C to +70°C
MAX32_E_ _......................................................-40°C to +85°C
MAX32_MJA ...................................................-55°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX320/MAX321/MAX322
Precision, Dual-Supply, SPST
Analog Switches
2 _______________________________________________________________________________________
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
Note 1: Signals on NC_, NO_, COM_, or IN_ exceeding V+ or V- are clamped by internal diodes. Limit forward diode current to
maximum current rating.
ELECTRICAL CHARACTERISTICS
(V+ = +5V ±10%, V- = -5V ±10%, VINH = 3.5V, VINL = 2.5V, TA= TMIN to TMAX, unless otherwise noted.)
-10 10
-50 50
COM On Leakage Current
(Note 6) nA
PARAMETER SYMBOL MIN TYP MAX
(Note 2) UNITS
On-Resistance RON 45 Ω
16 35
0.3 2 Ω
On-Resistance Match Between
Channels (Note 4) ∆RON
Analog Signal Range VCOM,
VNO,
VNC V- V+ V
On-Resistance Flatness
(Note 5) RFLAT(ON) 14Ω
-0.1 0.01 0.1
NO or NC Off Leakage Current
(Note 6)
INO(OFF)
or
INC(OFF) nA
-5 5
COM Off Leakage Current
(Note 6) -5 5 nAICOM(OFF)
ICOM(ON)
CONDITIONS
V+ = 5V, V- = -5V,
ICOM = 1.0mA,
VNO or VNC = ±3V
V+ = 4.5V,
V- = -4.5V,
ICOM = 1.0mA,
VNO or V NC = ±3.5V
V+ = 5V, V- = -5V,
ICOM = 1.0mA,
VNO or VNC = ±3V
V+ = 5.5V,
V- = -5.5V,
VCOM = ±4.5V,
VNO or V NC = 4.5V
(Note 3)
V+ = 5.5V,
V- = -5.5V,
VCOM = ±4.5V,
VNO or V NC = 4.5V
V+ = 5.5V,
V- = -5.5V,
VCOM = ±4.5V,
VNO or V NC = ±4.5V
TA= +25°C
TA= +25°C
TA= +25°C
TA= TMIN
to TMAX
TA= +25°C
TA= TMIN
to TMAX
TA= +25°C
TA= TMIN
to TMAX
TA=
+25°C
TA= TMIN to TMAX
C, E
C, E
C, E
TA= TMIN to TMAX
TA= TMIN to TMAX
M
M
M
4
6
-0.1 0.01 0.1
-40 40
-40 40
-0.2 0.05 0.2
C, E
M 16 30
ANALOG SWITCH
±
±
MAX320/MAX321/MAX322
Precision, Dual-Supply, SPST
Analog Switches
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS
(V+ = +5V ±10%, V- = -5V ±10%, VINH = 3.5V, VINL = 2.5V, TA= TMIN to TMAX, unless otherwise noted.)
PARAMETER SYMBOL MIN TYP MAX
(Note 2) UNITS
Input Current with Input
Voltage High IINH -0.5 0.005 0.5 µA
CONDITIONS
Input Current with Input
Voltage Low IINL -0.5 0.005 0.5 µA
Turn-On Time tON 65 150 ns
Charge Injection
(Note 3) Q25pC
CL= 1.0nF, VGEN = 0V,
RGEN = 0Ω, Figure 4
TA= +25°C
TA= TMIN to TMAX 175
VCOM = ±3V, Figure 2
TA= +25°C
TA= TMIN to TMAX 150
VCOM = ±3V, Figure 2Turn-Off Time tOFF 35 100 ns
Power-Supply Range
MAX322 only, RL= 300Ω, CL= 35pF, Figure 3
Break-Before-Make
Time Delay (Note 3) tD25 ns
TA= +25°C
TA= +25°C
RL= 50Ω, CL= 5pF,
f = 1MHz, Figure 5
Off Isolation (Note 7) OIRR 72 dB
TA= +25°C
RL= 50Ω, CL= 5pF,
f = 1MHz, Figure 6
Crosstalk (Note 8) 85 dB
TA= +25°Cf = 1MHz, Figure 7NC or NO Capacitance C(OFF) 9 pF
TA= +25°Cf = 1MHz, Figure 7COM Off Capacitance CCOM(OFF) 9pF
TA= +25°Cf = 1MHz, Figure 8COM On Capacitance CCOM(ON) pF
±2.7 ±8 V
Positive Supply Current
22
I+ V+ = 5.5V, V- = -5.5V,
VIN = 0V or V+,
all channels on or off TA= TMIN to TMAX -200 200 µA
Negative Supply
Current I- V+ = 5.5V, V- = -5.5V,
VIN = 0V or V+,
all channels on or off
TA= +25°C -125 80 125 µA
Note 2: The algebraic convention where the most negative value is a minimum and the most positive value a maximum is used in
this data sheet.
Note 3: Guaranteed by design.
Note 4: ∆RON = ∆RON max - ∆RON min.
Note 5: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the
specified analog signal range.
Note 6: Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at +25°C.
Note 7: Off Isolation = 20 log10 [ VCOM ⁄ (VNC or VNO) ], VCOM = output, VNC or VNO = input to off switch.
Note 8: Between any two switches.
TA= TMIN to TMAX
TA= +25°C
-200 200
-125 80 125
Input Voltage High VINH 3.5 V
3V < V+ < 8V, V- ≤0V
V+ = 5V ±10%, V- ≤0V V+ - 1.5
Input Voltage Low VINL 2.5 V
3V < V+ < 8V, V- ≤0V
V+ = 5V ±10%, V- ≤0V V+ - 2.5
LOGIC INPUT
DYNAMIC
SUPPLY
MAX320/MAX321/MAX322
Precision, Dual-Supply, SPST
Analog Switches
4 _______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(V+ = +5V, V- = -5V, TA = +25°C, unless otherwise noted.)
0.0001 -55 65 85
OFF LEAKAGE CURRENT vs. TEMPERATURE
10
MAX320-05
TEMPERATURE (°C)
OFF LEAKAGE CURRENT (nA)
-15 52545
-35 105 125
0.1
0.001
1
0.01
100 V+ = +5.5V, V- = -5.5V
VCOM = ±4.5V
VNC or VNO = 4.5V
±
0-8 -6 0 2
ON-RESISTANCE vs. VOLTAGE AT COM PIN
30
MAX320-01
VCOM (V)
RON (Ω)
-4 -2 468
20
5
25
10
15
V± = ±3V
V± = ±5V
V± = ±8V
0-5 -3-4 -2 3 4
ON-RESISTANCE vs. VOLTAGE AT COM PIN
(OVER TEMPERATURE)
30
MAX320-02
VCOM (V)
RON (Ω)
-1 0 1 2 5
20
5
25
15
10 A: TA = +125°C
B: TA = +85°C
C: TA = +25°C
D: TA = -55°C
D
C
B
A
0-5 -1
ON-RESISTANCE MATCH vs. VOLTAGE 
AT COM PIN (OVER TEMPERATURE)
MAX320-03
VCOM (V)
∆RON (Ω)
13
0.30
0.35
0.10
0.05
0.40
0.45
0.20
0.25
0.15
0.50
5
-3
A: TA = -55°C
B: TA = +25°C
C: TA = +85°C
D: TA = +125°C
CA
BD
0.0001 -55 65 85
ON LEAKAGE CURRENT vs. TEMPERATURE
10
MAX320-04
TEMPERATURE (°C)
ON LEAKAGE CURRENT (nA)
-15 5 25 45-35 105 125
0.1
0.001
1
0.01
100 V+ = +5.5V, V- = -5.5V
VCOM = ±4.5V, VNC or VNO = ±4.5V
0-55 65 85
SUPPLY CURRENT vs. TEMPERATURE
100
120
MAX320-07
TEMPERATURE (°C)
ISUPPLY (µA)
25 45-35 -15 5 105 125
80
20
40
60
140
-20 -5
CHARGE INJECTION vs. 
VOLTAGE AT COM PIN
15
MAX320-06
VCOM (V)
Q (pC)
-1 0 5
0
-15
10
5
-10
-5
20
-4 -3 -2 1234
MAX320/MAX321/MAX322
Precision, Dual-Supply, SPST
Analog Switches
_______________________________________________________________________________________ 5
__________Applications Information
Logic Levels
Calculate the logic thresholds typically as follows: VIH =
(V+ - 1.5V) and VIL = (V+ - 2.5V).
Power-supply consumption is minimized when IN1 and
IN2 are driven with logic-high levels equal to V+ and logic-
low levels well below the calculated VIL of (V+ - 2.5V). IN1
and IN2 can be driven to V- without damage.
Analog Signal Levels
Analog signals that range over the entire supply voltage
(V- to V+) can be switched, with very little change in on-
resistance over the entire voltage range (see
Typical
Operating Characteristics
). All switches are bidirec-
tional, so NO_, NC_, and COM_ pins can be used as
either inputs or outputs.
Power-Supply Sequencing
and Overvoltage Protection
Do not exceed the absolute maximum ratings, because
stresses beyond the listed ratings may cause perma-
nent damage to the devices.
Proper power-supply sequencing is recommended for
all CMOS devices. Always apply V+, followed by V-,
before applying analog signals or logic inputs, especial-
ly if the analog or logic signals are not current-limited. If
this sequencing is not possible, and if the analog or
logic inputs are not current-limited to <30mA, add two
small signal diodes (D1, D2) as shown in Figure 1.
Adding protection diodes reduces the analog signal
range to a diode drop (about 0.7V) below V+ for D1,
and a diode drop above V- for D2. Leakage is not
affected by adding the diodes. On-resistance increas-
es by a small amount at low supply voltages. Maximum
supply voltage (V- to V+) must not exceed 17V.
Adding protection diode D1 causes the logic thresh-
olds to be shifted relative to the positive power-supply
rail. This can be significant when low positive supply
voltages (+5V or less) are used. Driving IN1 and IN2 all
the way to the supply rails (i.e., to a diode drop higher
than the V+ pin or a diode drop lower than the V- pin) is
always acceptable.
The protection diodes D1 and D2 also protect against
some overvoltage situations. With the circuit of Figure 1,
if the supply voltage is below the absolute maximum
rating and if a fault voltage up to the absolute maximum
rating is applied to an analog signal pin, no damage
will result. For example, with ±5V supplies, analog sig-
nals up to ±8.5V will not damage the circuit of Figure 1.
If only a single fault signal is present, the fault voltage
can rise to +12V or to -12V without damage.
_____________________Pin Description
POSITIVE SUPPLY
COM
D1
D2
NO
V-
Vg
V+
NEGATIVE SUPPLY
MAX320
MAX321
MAX322
Figure 1. Overvoltage Protection Using Two External Blocking
Diodes
5Normally Closed Analog
Switch Terminal
NC2
(MAX321/MAX322)
Normally Open Analog
Switch Terminal
NO2
(MAX320)
Negative SupplyV-4
Logic InputsIN2, IN13, 7
PIN
Analog Switch Common
Terminals
COM1, COM22, 6
Normally Closed Analog
Switch Terminal
NC1
(MAX321)
Normally Open Analog
Switch Terminal
NO1
(MAX320/MAX322)
1
FUNCTIONNAME
Positive SupplyV+8
MAX320/MAX321/MAX322
Precision, Dual-Supply, SPST
Analog Switches
6 _______________________________________________________________________________________
VGEN
NC
or NO CL
VOUT
-5V
V-
V+ VOUT
IN OFF ON OFF
∆VOUT
Q = (∆VOUT)(CL)
COM
IN DEPENDS ON SWITCH CONFIGURATION;
INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
OFF ON OFF
IN
VIN
+5V
RGEN
IN
MAX320
MAX321
MAX322
Figure 4. Charge Injection
tr < 20ns
tf < 20ns
50%
LOGIC
INPUT V-
-5V
RL
300Ω
NO
or NC
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
VOUT = VCOM ( RL )
RL + RON
SWITCH
INPUT
IN
tOFF
0V
COM
SWITCH
OUTPUT
0.9 x V0UT 0.9 x VOUT
tON
VOUT
SWITCH
OUTPUT
LOGIC
INPUT
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
V+
CL
35pF
+5V
VOUT
VCOM
MAX320
MAX321
MAX322
50%
0.9 x V0UT1
0V
LOGIC
INPUT
SWITCH
OUTPUT 2
(VOUT2)0V
0.9 x VOUT2
tDtD
LOGIC
INPUT V-
-5V
RL2
300Ω
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
COM2
IN
COM1
VOUT2
V+
+5V
CL2
35pF
VCOM1 = +3VRL1
300Ω
VOUT1
CL1
35pF
NO1
NC2 SWITCH
OUTPUT 1
(VOUT1)
MAX322
VCOM2 = +3V
Figure 2. Switching Time
Figure 3. Break-Before-Make Interval (MAX322 only)
______________________________________________Test Circuits/Timing Diagrams
MAX320/MAX321/MAX322
Precision, Dual-Supply, SPST
Analog Switches
_______________________________________________________________________________________ 7
Figure 6. Crosstalk
IN VIN
SIGNAL
GENERATOR 0dBm
+5V
10nF
ANALYZER
NC 
or NO
RL
COM
10nF
-5V
V-
COM
V+
MAX320
MAX321
MAX322
SIGNAL
GENERATOR 0dBm
+5V
10nF
ANALYZER
N02
RL
COM1
10nF
V-
-5V
0V or 2.4V IN1
N01 50Ω
COM2
IN2 VIN
N.C.
V+
MAX320
MAX321
MAX322
Figure 5. Off Isolation
_________________________________Test Circuits/Timing Diagrams (continued)
CAPACITANCE
METER
NC or
NO
COM
10nF
V-
-5V
IN VIN
10nF +5V
f = 1MHz
V+
MAX320
MAX321
MAX322
Figure 8. Channel-On Capacitance
CAPACITANCE
METER NC or 
NO
COM
10nF
V-
-5V
IN VIN
10nF +5V
f = 1MHz
V+
MAX320
MAX321
MAX322
Figure 7. Channel-Off Capacitance
__Ordering Information (continued) ___________________Chip Topography
0.075"
(1.90mm)
0.055"
(1.40mm)
V+
IN2
V-
IN1
COM2
NO2 (MAX320)
NC2 (MAX321/2)
COM1
NO1 (MAX320/2)
NC1 (MAX321)
* Contact factory for dice specifications.
** Contact factory for availability.
TRANSISTOR COUNT: 91
SUBSTRATE CONNECTED TO V+
MAX320/MAX321/MAX322
Precision, Dual-Supply, SPST
Analog Switches
8 CERDIP**-55°C to +125°CMAX321MJA 8 CERDIP**-40°C to +85°CMAX321EJA 8 SO-40°C to +85°CMAX321ESA
8 µMAX0°C to +70°CMAX321CUA 8 SO0°C to +70°CMAX321CSA 8 Plastic DIP0°C to +70°C
MAX321CPA PIN-PACKAGETEMP. RANGEPART
8 Plastic DIP-40°C to +85°CMAX321EPA Dice*0°C to +70°CMAX321C/D
8 CERDIP**-55°C to +125°CMAX322MJA 8 CERDIP**-40°C to +85°CMAX322EJA 8 SO-40°C to +85°CMAX322ESA
8 µMAX0°C to +70°CMAX322CUA 8 SO0°C to +70°CMAX322CSA
8 Plastic DIP-40°C to +85°CMAX322EPA
8 Plastic DIP0°C to +70°C
MAX322CPA
Dice*0°C to +70°CMAX322C/D
________________________________________________________Package Information
L
α
C
A1B
DIM
A
A1
B
C
D
E
e
H
L
α
MIN
0.036
0.004
0.010
0.005
0.116
0.116
0.188
0.016
0°
MAX
0.044
0.008
0.014
0.007
0.120
0.120
0.198
0.026
6°
MIN
0.91
0.10
0.25
0.13
2.95
2.95
4.78
0.41
0°
MAX
1.11
0.20
0.36
0.18
3.05
3.05
5.03
0.66
6°
INCHES MILLIMETERS
8-PIN µMAX
MICROMAX SMALL OUTLINE
PACKAGE
0.650.0256
A
e
E H
D
0.101mm
0.004 in
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.
8
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© 1994 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.