19-0350; Rev 0; 12/94
Precision, Dual-Supply, SPST
Analog Switches
_______________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 (t
ON
= 150ns max, t
OFF
= 100ns
max).
The MAX320 series, powered from ±5V supplies, offers
35Ω max on-resistance (R
ON
), 2Ω max matching
between channels, and 4Ω max R
ON
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.
____________________________Features
o
Low On-Resistance, 35Ω max (16Ω typical)
o
R
ON
Matching Between Channels <2Ω
o
R
ON
Flatness <4Ω
o
Guaranteed Charge Injection <5pC
o
Bipolar Supply Operation (±3V to ±8V)
o
Low Power Consumption, <1.25mW
o
Low Leakage Current Over Temperature,
<2.5nA at +85°C
o
Fast Switching, t
ON
<150ns, t
OFF
<100ns
o
Guaranteed Break-Before-Make (MAX322 only)
MAX320/MAX321/MAX322
______________Ordering Information
PART
MAX320CPA
MAX320CSA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
________________________Applications
Battery-Operated Systems
Heads-Up Displays
Audio and Video Switching
Test Equipment
±5V DACs and ADCs
Sample-and-Hold Circuits
Guidance and Control Systems
Military Radios
Communications Systems
PBX, PABX
MAX320CUA
0°C to +70°C
8 µMAX
MAX320C/D
0°C to +70°C
Dice*
MAX320EPA
-40°C to +85°C
8 Plastic DIP
MAX320ESA
-40°C to +85°C
8 SO
MAX320EJA
-40°C to +85°C
8 CERDIP**
MAX320MJA
-55°C to +125°C
8 CERDIP**
Ordering Information continued at end of data sheet.
* Contact factory for dice specifications.
** Contact factory for availability.
_____________________Pin Configurations/Functional Diagrams/Truth Tables
TOP VIEW
MAX320
NO1
1
COM1
2
IN2
3
V-
4
DIP/SO/µMAX
MAX320
LOGIC
SWITCH
0
1
OFF
ON
8
7
6
5
MAX321
V+
IN1
COM2
NO2
NC1
1
COM1
2
IN2
3
V-
4
DIP/SO/µMAX
MAX321
LOGIC
SWITCH
0
1
ON
OFF
8
7
6
5
MAX322
V+
IN1
COM2
NC2
NO1
1
COM1
2
IN2
3
V-
4
DIP/SO/µMAX
LOGIC
0
1
MAX322
SWITCH 1
OFF
ON
SWITCH 2
ON
OFF
8
7
6
5
V+
IN1
COM2
NC2
SWITCHES SHOWN FOR LOGIC "0" INPUT
________________________________________________________________
Maxim Integrated Products
1
Call toll free 1-800-998-8800 for free samples or literature.
Precision, Dual-Supply, SPST
Analog Switches
MAX320/MAX321/MAX322
ABSOLUTE MAXIMUM RATINGS
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
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.
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
(V+ = +5V ±10%, V- = -5V ±10%, V
INH
= 3.5V, V
INL
= 2.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
ANALOG SWITCH
Analog Signal Range
V
COM
,
V
NO
,
V
NC
(Note 3)
V+ = 4.5V,
V- = -4.5V,
I
COM
= 1.0mA,
V
NO
or V
NC
= ±3.5V
V+ = 5V, V- = -5V,
I
COM
= 1.0mA,
V
NO
or V
NC
= ±3V
T
A
=
+25°C
C, E
M
V-
16
16
V+
35
30
45
0.3
2
4
1
4
6
-0.1
-5
-40
-0.1
-5
-40
-0.2
-10
-50
0.05
0.01
0.01
0.1
5
40
0.1
5
40
0.2
10
50
nA
nA
nA
Ω
Ω
V
SYMBOL
CONDITIONS
MIN
TYP
(Note 2)
MAX
UNITS
On-Resistance
R
ON
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
C, E
to T
MAX
M
T
A
= +25°C
T
A
= T
MIN
C, E
to T
MAX
M
T
A
= +25°C
T
A
= T
MIN
C, E
to T
MAX
M
On-Resistance Match Between
Channels (Note 4)
∆R
ON
Ω
On-Resistance Flatness
(Note 5)
V+ = 5V, V- = -5V,
R
FLAT(ON)
I
COM
= 1.0mA,
V
NO
or V
NC
= ±3V
I
NO(OFF)
or
NO or NC Off Leakage Current
(Note 6)
COM Off Leakage Current
(Note 6)
V+ = 5.5V,
V- = -5.5V,
I
COM(OFF)
V
COM
= ±4.5V,
V
NO
or V
NC
= 4.5V
V+ = 5.5V,
V- = -5.5V,
V
COM
= ±4.5V,
V
NO
or V
NC
= ±4.5V
±
COM On Leakage Current
(Note 6)
I
COM(ON)
2
_______________________________________________________________________________________
±
I
NC(OFF)
V+ = 5.5V,
V- = -5.5V,
V
COM
= ±4.5V,
V
NO
or V
NC
= 4.5V
Precision, Dual-Supply, SPST
Analog Switches
ELECTRICAL CHARACTERISTICS
(V+ = +5V ±10%, V- = -5V ±10%, V
INH
= 3.5V, V
INL
= 2.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
LOGIC INPUT
Input Current with Input
Voltage High
Input Current with Input
Voltage Low
Input Voltage High
Input Voltage Low
DYNAMIC
Turn-On Time
Turn-Off Time
Break-Before-Make
Time Delay (Note 3)
Charge Injection
(Note 3)
Off Isolation (Note 7)
Crosstalk (Note 8)
NC or NO Capacitance
COM Off Capacitance
COM On Capacitance
SUPPLY
Power-Supply Range
Positive Supply Current
I+
V+ = 5.5V, V- = -5.5V,
V
IN
= 0V or V+,
all channels on or off
V+ = 5.5V, V- = -5.5V,
V
IN
= 0V or V+,
all channels on or off
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
±2.7
-125
-200
-125
-200
80
80
±8
125
µA
200
125
µA
200
V
C
(OFF)
t
ON
t
OFF
t
D
Q
OIRR
V
COM
= ±3V, Figure 2
V
COM
= ±3V, Figure 2
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
2
5
2
72
85
9
9
22
5
35
65
150
175
100
150
ns
ns
ns
pC
dB
dB
pF
pF
pF
I
INH
I
INL
V
INH
V
INL
V+ = 5V ±10%, V-
≤
0V
3V < V+ < 8V, V-
≤
0V
V+ = 5V ±10%, V-
≤
0V
3V < V+ < 8V, V-
≤
0V
V+ - 2.5
-0.5
-0.5
3.5
V+ - 1.5
2.5
0.005
0.005
0.5
0.5
µA
µA
V
V
SYMBOL
CONDITIONS
MIN
TYP
(Note 2)
MAX
UNITS
MAX320/MAX321/MAX322
MAX322 only, R
L
= 300Ω, C
L
= 35pF, Figure 3
C
L
= 1.0nF, V
GEN
= 0V,
R
GEN
= 0Ω, Figure 4
R
L
= 50Ω, C
L
= 5pF,
f = 1MHz, Figure 5
R
L
= 50Ω, C
L
= 5pF,
f = 1MHz, Figure 6
f = 1MHz, Figure 7
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
C
COM(OFF)
f = 1MHz, Figure 7
C
COM(ON)
f = 1MHz, Figure 8
Negative Supply
Current
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
I-
The algebraic convention where the most negative value is a minimum and the most positive value a maximum is used in
this data sheet.
Guaranteed by design.
∆R
ON
=
∆R
ON
max -
∆R
ON
min.
Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the
specified analog signal range.
Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at +25°C.
Off Isolation = 20 log
10
[ V
COM
⁄ (V
NC or
V
NO
) ], V
COM
= output, V
NC or
V
NO
= input to off switch.
Between any two switches.
_______________________________________________________________________________________
3
Precision, Dual-Supply, SPST
Analog Switches
MAX320/MAX321/MAX322
__________________________________________Typical Operating Characteristics
(V+ = +5V, V- = -5V, T
A
= +25°C, unless otherwise noted.)
ON-RESISTANCE vs. VOLTAGE AT COM PIN
MAX320-01
V± = ±3V
25
20
R
ON
(Ω)
A
25
B
R
ON
(Ω)
0.45
0.40
0.35
∆R
ON
(Ω)
A:
B:
C:
D:
T
A
= -55°C
T
A
= +25°C
T
A
= +85°C
T
A
= +125°C
V± = ±5V
20
C
15
D
10
5
0
A:
B:
C:
D:
-5 -4 -3
-2 -1
0
1
T
A
= +125°C
T
A
= +85°C
T
A
= +25°C
T
A
= -55°C
2
3
4 5
0.30
0.25
0.20
0.15
0.10
0.05
0
-5
-3
-1
1
3
5
V
COM
(V)
C
B
A
D
15
10
5
0
-8
-6
-4
-2
0
V
COM
(V)
2
4
6
8
V± = ±8V
V
COM
(V)
ON LEAKAGE CURRENT vs. TEMPERATURE
MAX320-04
OFF LEAKAGE CURRENT vs. TEMPERATURE
V+ = +5.5V, V- = -5.5V
V
COM
= ±4.5V
V
NC
or V
NO
= 4.5V
±
MAX320-05
CHARGE INJECTION vs.
VOLTAGE AT COM PIN
15
10
5
Q (pC)
0
-5
-10
-15
MAX320-06
100
10
1
0.1
0.01
V+ = +5.5V, V- = -5.5V
V
COM
= ±4.5V, V
NC
or V
NO
= ±4.5V
100
OFF LEAKAGE CURRENT (nA)
10
1
0.1
0.01
20
ON LEAKAGE CURRENT (nA)
0.001
0.001
0.0001
-55 -35 -15
5
25
45 65
85 105 125
-55 -35 -15
5
25
45 65
85 105 125
TEMPERATURE (°C)
TEMPERATURE (°C)
-20
-5 -4 -3
-2
-1
0
1
2
3
4
5
V
COM
(V)
0.0001
SUPPLY CURRENT vs. TEMPERATURE
MAX320-07
140
120
100
I
SUPPLY
(µA)
80
60
40
20
0
-55 -35 -15
5
25
45 65 85 105 125
TEMPERATURE (°C)
4
_______________________________________________________________________________________
MAX320-03
MAX320-02
30
ON-RESISTANCE vs. VOLTAGE AT COM PIN
(OVER TEMPERATURE)
30
ON-RESISTANCE MATCH vs. VOLTAGE
AT COM PIN (OVER TEMPERATURE)
0.50
Precision, Dual-Supply, SPST
Analog Switches
_____________________Pin Description
POSITIVE SUPPLY
MAX320/MAX321/MAX322
PIN
NAME
NO1
(MAX320/MAX322)
FUNCTION
D1
Normally Open Analog
Switch Terminal
Normally Closed Analog
Switch Terminal
Analog Switch Common
Terminals
Logic Inputs
Negative Supply
Normally Open Analog
Switch Terminal
Normally Closed Analog
Switch Terminal
Positive Supply
NO
Vg
V+
1
NC1
(MAX321)
2, 6
3, 7
4
COM1, COM2
IN2, IN1
V-
NO2
(MAX320)
5
NC2
(MAX321/MAX322)
8
V+
COM
V-
D2
NEGATIVE SUPPLY
MAX320
MAX321
MAX322
Figure 1. Overvoltage Protection Using Two External Blocking
Diodes
__________Applications Information
Logic Levels
Calculate the logic thresholds typically as follows: V
IH
=
(V+ - 1.5V) and V
IL
= (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 V
IL
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.
_______________________________________________________________________________________
5
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
