MAX4632EPE [MAXIM]
Fault-Protected, High-Voltage, Dual Analog Switches; 故障保护，高电压，双路模拟开关
| 型号： | MAX4632EPE |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Fault-Protected, High-Voltage, Dual Analog Switches |
| 文件： | 总16页 (文件大小：208K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1515; Rev 0; 7/99
Fault-Protected, High-Voltage,
Dual Analog Switches
12/MAX463
General Description
Features
The MAX4631/MAX4632/MAX4633 high-voltage, dual
analog switches are pin compatible with the industry-stan-
dard DG401/DG403/DG405. They upgrade the existing
devices with fault-protected inputs and Rail-to-Rail® signal
handling capabilities. The MAX4631/MAX4632/MAX4633’s
normally open (NO) and normally closed (NC) terminals
are protected from overvoltage faults up to 36V during
power-up or power-down. During a fault condition, these
terminals become open circuit and only nanoamperes of
leakage current flow from the source, yet the switch output
(COM_) continues to furnish up to 18mA of the appropri-
ate polarity supply voltage to the load. This ensures unam-
biguous rail-to-rail outputs when a fault begins and ends.
On-resistance is 85Ω (max) at +25°C and is matched
between switches to 6Ω (max). Off-leakage current is only
0.5nA at +25°C and 5nA at +85°C.
♦ Fault Protection
±40V with Power Off
±36V with ±15V Supplies (MAX4631/MAX4633)
±25V with ±15V Supplies (MAX4632)
♦ Rail-to-Rail Signal Handling
♦ No Power-Supply Sequencing Required
♦ All Switches Off with Power Off
♦ Output Clamped to Appropriate Supply Voltage
During Fault Condition; No Transition Glitch
♦ 85Ω (max) Signal Paths with ±15V Supplies
♦ ±4.5V to ±18V Dual Supplies
+9V to +36V Single Supply
♦ Low Power Consumption: <6mW
The MAX4631 has two NO single-pole/single-throw (SPST)
switches. The MAX4632 has two NO/NC single-pole/
double-throw (SPDT) switches. The MAX4633 has two NO
double-pole/single-throw (DPST) switches.
♦ Pin Compatible with Industry-Standard
DG401/DG403/DG405
♦ TTL- and CMOS-Logic Compatible Inputs with
Single +9V to +15V, or ±15V Supplies
These CMOS switches operate with dual power supplies
ranging from 4.5V to 18V or a single supply between
+9V and +36V. All digital inputs have +0.8V and +2.4V
logic thresholds, ensuring both TTL- and CMOS-logic
compatibility when using 15V or a single +12V supply.
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
16 Narrow SO
16 Plastic DIP
16 Narrow SO
16 Plastic DIP
16 CERDIP
MAX4631CSE
MAX4631CPE
MAX4631ESE
MAX4631EPE
MAX4631MJE
MAX4632CSE
MAX4632CPE
MAX4632ESE
MAX4632EPE
MAX4632MJE
MAX4633CSE
MAX4633CPE
MAX4633ESE
MAX4633EPE
MAX4633MJE
0°C to +70°C
Applications
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
0°C to +70°C
ATE Equipment
Data Acquisition
Industrial and Process Control Systems
Avionics
16 Narrow SO
16 Plastic DIP
16 Narrow SO
16 Plastic DIP
16 CERDIP
0°C to +70°C
Redundant/Backup Systems
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
0°C to +70°C
16 Narrow SO
16 Plastic DIP
16 Narrow SO
16 Plastic DIP
16 CERDIP
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
Pin Configurations appear at end of data sheet.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Fault-Protected, High-Voltage,
Dual Analog Switches
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND)
Continuous Current into Any Terminal.............................. 30mA
V+...........................................................................-0.3V to +44V
V- ............................................................................-44V to +0.3V
V+ to V-...................................................................-0.3V to +44V
COM_, IN_ (Note 1) ..............................(V- - 0.3V) to (V+ + 0.3V)
NC_, NO_ (Note 2)
MAX4631_ _E .....................................(V+ - 36V) to (V- + 36V)
MAX4632_ _E .....................................(V+ - 25V) to (V- + 25V)
MAX4633_ _E .....................................(V+ - 36V) to (V- + 36V)
NC_, NO_ to COM_
Peak Current into Any Terminal (pulsed at 1ms,
10% duty cycle)............................................................ 50mA
Continuous Power Dissipation (T = +70°C) (Note 2)
A
Plastic DIP (derate 10.53mW/°C above +70°C) ..........842mW
Narrow SO (derate 8.70mW/°C above +70°C) ............696mW
CERDIP (derate 10.00mW/°C above +70°C)...............842mW
Operating Temperature Ranges
MAX463_C_E......................................................0°C to +70°C
MAX463_E_E ...................................................-40°C to +85°C
MAX463_M_E ................................................-55°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
MAX4631_ _E ......................................................-36V to +36V
MAX4632_ _E ......................................................-25V to +25V
MAX4633_ _E ......................................................-36V to +36V
Note 1: COM_ and IN_ pins are not fault protected. Signals on COM_ to IN_ exceeding V+ or V- are clamped by internal diodes.
Limit forward diode current to maximum current rating.
Note 2: NC_ and NO_ pins are fault protected (see Electrical Characteristics). With power applied to V+ or V-, signals on NC_ or
NO_ exceeding 25V (MAX4632) or 36V (MAX4631/MAX4633) may damage the device. With V+ = V- = 0, signals on NC_
or NO_ exceeding 40V may damage the device.
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 Supplies
(V+ = +15V, V- = -15V, V
= 0.8V, V
= 2.4V, T = T
to T , unless otherwise noted. Typical values are at T = +25°C.) (Note 3)
MAX A
INL_
INH_
A
MIN
PARAMETER
ANALOG SWITCH
SYMBOL
CONDITIONS
T
A
MIN
TYP
MAX
UNITS
12/MAX463
Fault-Free Analog Signal Range
(Note 2)
V , V
NO_ NC_
C, E, M
V-
V+
V
+25°C
C, E
M
62
3
85
100
200
6
COM_ to NO_ or NC_
On-Resistance
V
I
=
10V,
COM_
COM_
R
Ω
ON
= 1mA
+25°C
C, E
M
COM_ to NO_ or NC_
On-Resistance Match
Between Channels (Note 4)
V
=
10V,
COM_
COM_
∆R
10
Ω
ON
I
= 1mA
15
+25°C
C, E
M
-0.5
-5
0.01
0.01
0.5
5
I
I
,
,
NO_ (OFF)
NC_ (OFF)
NO_, NC_, COM_ Off-Leakage
Current (Note 5)
V
= 14V,
COM_
nA
nA
−
V
NO_
or V
= +14V
NC_
I
COM_(OFF)
-100
-0.5
-20
100
0.5
20
+25°C
C, E
M
V
V
= 14V,
COM_
NO_
COM_ On-Leakage Current
(Note 5)
I
or V =
14V
COM_(ON)
NC_
or floating
-100
100
FAULT PROTECTION
MAX4631/
MAX4633
C, E, M
-36
36
Applies with
power on
Fault-Protected Analog
Signal Range (Note 2)
V , V
NO_ NC_
V
MAX4632
C, E, M
C, E, M
-25
-40
25
40
Applies with power off
2
_______________________________________________________________________________________
Fault-Protected, High-Voltage,
Dual Analog Switches
12/MAX463
ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
(V+ = +15V, V- = -15V, V
= 0.8V, V
= 2.4V, T = T
to T , unless otherwise noted. Typical values are at T = +25°C.) (Note 3)
MAX A
INL_
INH_
A
MIN
PARAMETER
SYMBOL
CONDITIONS
T
MIN
-10
-200
-1
TYP
MAX
10
UNITS
nA
A
+25°C
C, E
M
V
NO_
or V 25V,
=
NC_
COM_ Output Leakage Current,
Supplies On
I
no connection to “on” channel
(MAX4632 only)
200
1
COM_
µA
+25°C
C, E
M
-20
-200
-10
-20
-200
-10
13
20
nA
NO_ or NC_ Input Leakage
Current, Supplies On
V
V
or V
=
10V
25V,
NO_
NC_
I
I
, I
200
10
NO_ NC_
=
COM_
µA
+25°C
C, E
M
20
nA
NO_ or NC_ Input Leakage
Current, Supplies Off
, I
V
NO_
or V
=
40V,
200
10
NO_ NC_
NC_
µA
V
V
or V
or V
= +25V
= -25V
+25°C
+25°C
18
24
NO_
NC_
COM_ Output Clamp Current,
Supplies On
I
mA
COM_
-24
-18
13
NO_
NC_
COM_ Output Clamp Resistance,
Supplies On
R
COM_
V
NO_
or V
=
25V
+25°C
0.5
1
kΩ
NC_
LOGIC INPUT
IN_ Input Logic Voltage High
IN_ Input Logic Voltage Low
V
C, E, M
C, E, M
+25°C
C, E, M
2.4
V
V
INH_
V
0.8
1
INL_
-1
-5
0.03
100
50
IN_ Input Current Logic
High or Low
I
, I
V
V
= 0.8V or 2.4V
µA
INH_ INL_
IN_
5
SWITCH DYNAMIC CHARACTERISTICS
+25°C
C, E,
M
150
500
600
100
400
500
=
10V, R = 1kΩ,
L
COM_
Turn-On Time
Turn-Off Time
t
ns
ns
ON
Figure 2
+25°C
C, E,
M
V
COM_
= 10V, R = 1kΩ,
L
t
OFF
Figure 2
Break-Before-Make Time Delay
(MAX4632 only)
V
= 10V, R = 1kΩ,
COM_ L
t
+25°C
+25°C
C, E, M
C, E, M
C, E, M
10
40
5
ns
pC
pF
pF
pF
BBM
Figure 3
C = 100pF, Figure 4,
NO_ = NC_ = GND, R = 0
L
Charge Injection (Note 6)
NO_, NC_ Off- Capacitance
COM_ Off-Capacitance
COM_ On-Capacitance
Q
10
S
C
C
,
NO_ = NC_ = GND, f = 1MHz,
Figure 5
NC_(OFF)
NO_(OFF)
18
18
22
COM_ = GND, f = 1MHz,
Figure 5
C
COM_(OFF)
COM_ = NO_ = NC_ = GND,
f = 1MHz, Figure 5
C
COM_(ON)
_______________________________________________________________________________________
3
Fault-Protected, High-Voltage,
Dual Analog Switches
ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
(V+ = +15V, V- = -15V, V
= 0.8V, V
= 2.4V, T = T
to T , unless otherwise noted. Typical values are at T = +25°C.) (Note 3)
MAX A
INL_
INH_
A
MIN
PARAMETER
SYMBOL
CONDITIONS
T
A
MIN
TYP
MAX
UNITS
R = 50Ω, C = 15pF,
L
L
Off-Isolation
(Note 7)
V
ISO
V
NO_
= V
= 1V
,
,
C, E, M
C, E, M
-62
dB
NC_
RMS
f = 1MHz, Figure 6
R = 50Ω, C = 15pF,
L
L
Channel-to-Channel Crosstalk
(Note 8)
V
CT
V
NO_
= V
= 1V
-66
dB
NC_
RMS
f = 1MHz, Figure 7
POWER SUPPLY
Power-Supply Range
V+, V-
I+
C, E, M
+25°C
C, E, M
+25°C
C, E, M
+25°C
C, E, M
+25°C
C, E, M
4.5
-1
18
325
550
200
300
1
V
230
130
0.01
125
All V
= 0 or 5V,
IN_
IN_
IN_
IN_
V+ Supply Current
V- Supply Current
µA
V
NO_
or V
= 0
NC_
All V
= 0 or 5V,
= 0
µA
µA
I-
V
NO_
or V
NC_
All V
= 0 or 15V,
V
NO_
or V
= 0
NC_
10
GND Supply Current
I
GND
175
300
All V
= 5V,
V
NO_
or V
= 0
NC_
ELECTRICAL CHARACTERISTICS—Single Supply
(V+ = +15V, V- = -15V, V
= 0.8V, V
= 2.4V, T = T
to T , unless otherwise noted. Typical values are at T = +25°C.) (Note 3)
MAX A
INL_
INH_
A
MIN
PARAMETER
ANALOG SWITCH
SYMBOL
CONDITIONS
T
A
MIN
TYP
MAX
UNITS
12/MAX463
Fault-Free Analog Signal Range
(Note 2)
V , V
NO_ NC_
C, E, M
0
V+
V
+25°C
C, E
M
125
4
200
250
300
10
COM_ to NO_ or NC_
On-Resistance
V
I
= 10V,
= 1mA
COM_
COM_
R
Ω
ON
+25°C
C, E
M
COM_ to NO_ or NC_
On-Resistance Match
Between Channels (Note 4)
V
= 10V,
= 1mA
COM_
COM_
∆R
20
Ω
ON
I
30
+25°C
C, E
M
-0.5
-10
0.01
0.01
0.5
10
NO_, NC_, COM_ Off-Leakage
Current (Notes 5, 9)
I
I
,
V
= 10V,
COM_
NO_ (OFF)
NC_ (OFF)
nA
nA
V
NO_
or V
= 12V
NC_
-200
-0.5
-20
200
0.5
20
+25°C
C, E
M
COM_ On-Leakage Current
(Notes 5, 9)
V
V
= 10V,
NC_
COM_
NO_
I
COM_(ON)
or V
= 1V or 12V
-400
400
FAULT PROTECTION
MAX4631/
MAX4633
C, E, M
-36
36
Applies with
power on
Fault-Protected Analog
Signal Range (Note 2)
V , V
NO_ NC_
V
MAX4632
C, E, M
C, E, M
-25
-40
25
40
Applies with power off
4
_______________________________________________________________________________________
Fault-Protected, High-Voltage,
Dual Analog Switches
12/MAX463
ELECTRICAL CHARACTERISTICS—Single Supply (continued)
(V+ = +15V, V- = -15V, V
= 0.8V, V
= 2.4V, T = T
to T , unless otherwise noted. Typical values are at T = +25°C.) (Note 3)
MAX A
INL_
INH_
A
MIN
PARAMETER
SYMBOL
CONDITIONS
T
A
MIN
TYP
MAX
UNITS
V
or V 25V,
=
NC_
C, E
M
-10
10
nA
NO_
COM_ Output Leakage Current,
Supplies On
I
no connection to “on” channel
(MAX4632 only)
COM_
-1
1
µA
C, E
M
-100
-10
100
10
nA
µA
nA
µA
NO_ or NC_ Input Leakage
Current, Supplies On
V
V
or V
=
10V
25V,
NO_
NC_
I
I
, I
NO_ NC_
=
COM_
C, E
M
-100
-10
1
100
10
NO_ or NC_ Input Leakage
Current, Supplies Off
, I
V
NO_
V
NO_
V
NO_
or V
or V
or V
=
40V
NO_ NC_
NC_
NC_
NC_
COM_ Output Clamp Current,
Supplies On
I
= 25V
= 25V
+25°C
+25°C
4
5.5
1
10
mA
COM_
COM_ Output Clamp Resistance,
Supplies On
R
2.5
kΩ
COM_
LOGIC INPUT
IN_ Input Logic Voltage High
IN_ Input Logic Voltage Low
V
C, E, M
C, E, M
+25°C
C, E, M
2.4
V
V
INH_
V
0.8
1
INL_
-1
-5
0.03
140
100
µA
µA
IN_ Input Current Logic
High or Low
I
, I
V
= 0.8V or 2.4V
INH_ INL_
IN_
5
SWITCH DYNAMIC CHARACTERISTICS
+25°C
C, E,
M
250
300
500
200
250
400
V
COM_
= 10V, R = 2kΩ,
L
Turn-On Time
Turn-Off Time
t
ns
ns
ON
Figure 2
+25°C
C, E,
M
V
COM_
= 10V, R = 2kΩ,
L
t
OFF
Figure 2
Break-Before-Make Time Delay
(MAX4632 only)
V
= 10V, R = 2kΩ,
COM_ L
t
+25°C
+25°C
C, E, M
C, E, M
C, E, M
5
40
5
ns
pC
pF
pF
pF
BBM
Figure 3
C = 100pF, Figure 4,
NO_ = NC_ = GND, R = 0
L
Charge Injection (Note 6)
NO_, NC_ Off-Capacitance
COM_ Off-Capacitance
COM_ On-Capacitance
Q
S
C
C
,
NO_ = NC_ = GND,
f = 1MHz, Figure 5
NC_(OFF)
NO_(OFF)
20
20
25
COM_ = GND, f = 1MHz,
Figure 5
C
COM_(OFF)
COM_ = NO_ = NC_ = GND,
f = 1MHz, Figure 5
C
COM_(ON)
R = 50Ω, C = 15pF,
L
L
Off-Isolation
(Note 7)
V
ISO
V
NO_
= V
= 1V
,
C, E, M
C, E, M
-62
-65
dB
dB
NC_
RMS
f = 1MHz, Figure 6
R = 50Ω, C = 15pF,
L
L
Channel-to-Channel Crosstalk
(Note 8)
V
CT
V
NO_
= V = 1V
NC_ RMS
,
f = 1MHz, Figure 7
_______________________________________________________________________________________
5
Fault-Protected, High-Voltage,
Dual Analog Switches
ELECTRICAL CHARACTERISTICS—Single Supply (continued)
(V+ = +15V, V- = -15V, V
= 0.8V, V
= 2.4V, T = T
to T , unless otherwise noted. Typical values are at T = +25°C.) (Note 3)
MAX A
INL_
INH_
A
MIN
PARAMETER
POWER SUPPLY
SYMBOL
CONDITIONS
T
A
MIN
TYP
MAX
UNITS
Power-Supply Range
V+, V-
I+
C, E, M
+25°C
C, E, M
+25°C
C, E, M
0
36
V
165
165
250
400
250
400
All V
= 0 or 5V,
IN_
V+ Supply Current
µA
V
NO_
or V
= 0
NC_
All V
= 0 or 5V,
= 0
IN_
GND Supply Current
I
µA
GND
V
NO_
or V
NC_
Note 2: NC_ and NO_ pins are fault protected (see Electrical Characteristics). With power applied to V+ or V-, signals on NC_ or
NO_ exceeding 25V (MAX4632) or 36V (MAX4631/MAX4633) may damage the device. With V+ = V- = 0, signals on NC_
or NO_ exceeding 40V may damage the device.
Note 3: The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
Note 4: ∆R
= R
- R
.
ON
ON(MAX)
ON(MIN)
Note 5: Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at +25°C.
Note 6: Guaranteed by design.
Note 7: Off-isolation = 20log [V
/ (V
or V
)], V
= output, V
or V
= input to off switch.
10 COM_
NC_
NO_
COM_
NC_
NO_
Note 8: Between any two switches.
Note 9: Leakage testing for single-supply operation is guaranteed by testing with dual supplies.
12/MAX463
Typical Operating Characteristics
(T = +25°C, unless otherwise noted.)
A
SWITCH ON-RESISTANCE vs. V
ON-RESISTANCE vs. V
COM
AND TEMPERATURE (DUAL SUPPLIES)
SWITCH ON-RESISTANCE
vs. V (SINGLE SUPPLY)
COM
(DUAL SUPPLIES)
COM
200
180
160
140
120
100
80
120
100
80
60
40
20
0
500
450
400
350
300
250
200
150
100
50
V- = GND
V+ = +5V
T
= +125°C
A
T
= +85°C
V+ = +5V
V- = -5V
A
V+ = +12V
V- = -12V
V+ = +10V
V- = -10V
V+ = +8V
V+ = +12V
V+ = +15V
V+ = +20V
V+ = +24V
V+ = +30V
60
T
= +25°C
A
T
A
= -55°C
T
= -40°C
0
40 V+ = +15V
A
V+ = +20V
V- = -20V
V- = -15V
V+ = 15V
V- = -15V
20
0
-20 -15 -10 -5
0
5
10 15 20
-15
-10
-5
5
10
15
0
5
10
15
20
25
30
V
COM
(V)
V
COM
(V)
V
(V)
COM
6
_______________________________________________________________________________________
Fault-Protected, High-Voltage,
Dual Analog Switches
12/MAX463
Typical Operating Characteristics (continued)
(T = +25°C, unless otherwise noted.)
A
ON-RESISTANCE vs. V
AND TEMPERATURE (SINGLE SUPPLY)
COM
LOGIC-LEVEL THRESHOLD vs. V+
SUPPLY CURRENT vs. TEMPERATURE
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
200
180
160
140
120
100
80
250
230
210
190
170
150
130
110
90
SINGLE OR DUAL SUPPLY
V+ = +12V
DUAL SUPPLIES
V+ = +15V
T
= +125°C
A
T
A
= +25°C
V- = -15V
T
= +85°C
A
60
SINGLE SUPPLY
V+ = +12V
V- = GND
40
20
70
T
= -40°C
2
A
T
A
= -55°C
10
0
50
0
5
10 15 20 25 30 35 40
V+ (V)
-55 -35 -15
5
25 45 65 85 105 125
0
4
6
8
12
TEMPERATURE (°C)
V
COM
(V)
FREQUENCY RESPONSE
SUPPLY CURRENT vs. V
I+ vs. V
IN
IN
0
120
100
80
250
200
150
100
50
250
200
150
100
50
DUAL SUPPLIES
V+ = +15V
V- = -15V
V+ = +15V
V- = -15V
-10
-20
-30
ON-LOSS
I+
60
SINGLE SUPPLY
V+ = +12V
-40
40
V- = GND
I-
-50
-60
20
0
ON-PHASE
-70
-80
-90
-20
-40
-60
-80
-100
-120
OFF-LOSS
I
GND
-100
-110
-120
0
0
0.01
0.1
1
10
100
1000
0
2
4
6
8
10 12 14 16
0
2
4
6
8
10 12 14 16
FREQUENCY (MHz)
V
IN
(V)
V (V)
IN
ON/OFF TIME
vs. DUAL-SUPPLY VOLTAGE
ON/OFF TIME
vs. SINGLE-SUPPLY VOLTAGE
CHARGE INJECTION vs. V
COM
30
25
20
15
10
5
500
450
400
350
300
250
200
150
100
50
450
400
350
300
250
NO_ t
ON
DUAL SUPPLIES
V+ = +15V
NC_ t
ON
200
150
100
V- = -15V
NO_ t
ON
NC_ t
NO_ t
OFF
ON
0
NO_ t
SINGLE SUPPLY
V+ = +12V
NC_ t
OFF
OFF
50
0
-5
-10
NC_ t
OFF
0
0
2
4
6
8
10 12 14 16 18 20
0
6
12
18
24
30
36
-15
-10
-5
0
5
10
15
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
V
COM
(V)
_______________________________________________________________________________________
7
Fault-Protected, High-Voltage,
Dual Analog Switches
Typical Operating Characteristics (continued)
(T = +25°C, unless otherwise noted.)
A
ON/OFF TIME vs. TEMPERATURE
LEAKAGE CURRENT vs. TEMPERATURE
170
150
130
110
90
1000
100
10
I
AT
COM (ON)
V
= -14V
COM
I
V
V
AT
COM (OFF)
= +14V,
NO
= -14V
COM (ON)
COM
I
AT
= +14V
t
ON
V
COM
I
V
V
AT
= -14V,
= +14V
NO (OFF)
NO
COM
t
OFF
1
I
AT
= +14V,
= -14V
NO (OFF)
V
NO
V
0.1
0.01
COM
70
I
AT
COM (OFF)
= -14V,
V
COM
NO
V
= +14V
50
-55 -35 -15
5
25 45 65 85 105 125
-55 -35 -15
5
25 45 65 85 105 125
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT OVERVOLTAGE vs.
OUTPUT CLAMPING (±±1V SUPPLIES)
FAULT-FREE SIGNAL
(±±1V SUPPLIES)
+20
+10
0
+10
0
-10
-20
+20
0
-10
12/MAX463
+10
0
-20
-10
OUTPUT CLAMPING
OUTPUT CLAMPING
(20µs/div)
(20µs/div)
Pin Description
PIN
NAME
FUNCTION
MAX4631
1, 8
MAX4632
1, 8
MAX4633
1, 8
COM1, COM2
NO1, NO2
IN1, IN2
N.C.
Analog Switch Common Terminals
Analog Switch Normally Open Terminals
Logic-Control Digital Inputs
16, 9
15, 10
2–7, 12
—
16, 9
15, 10
2, 7, 12
3, 6
16, 9
15, 10
2, 7, 12
3, 6
No Connection. Not internally connected.
Analog Switch Common Terminals
Analog Switch Normally Closed Terminals
Analog Switch Normally Open Terminals
Positive Supply Input
COM3, COM4
NC3, NC4
NO3, NO4
V+
—
4, 5
—
—
—
4, 5
11
11
11
13
13
13
GND
Ground
14
14
14
V-
Negative Supply Input
8
_______________________________________________________________________________________
Fault-Protected, High-Voltage,
Dual Analog Switches
12/MAX463
input voltage sensors. The simplified structure is shown
in Figure 1. The parallel N1 and P1 MOSFETs form the
switch element. N3 and P3 are sensor elements to sam-
ple the input voltage and compare it against the power-
supply rails.
-15V
COMPARATOR
N-CHANNEL
DRIVER
During normal operation of a conducting channel, N1
and P1 remain on with a typical 62Ω on-resistance
between NO_ (or NC_) and COM_. If the input voltage
-V (-15V)
CLAMP
-15V
N3
SENSE
SWITCH
exceeds either supply rail by about 50mV, the parallel
N2
combination switches (N1, P1) are forced off through
NC_
or
NO_
N1
P1
the driver and sensing circuitry. At the same time, the
OUTPUT COM_
INPUT
output (COM_) is clamped to the appropriate supply
rail by the clamp circuitry (N2, P2). Two clamp circuits
limit the output voltage to the supply voltages.
P2
CLAMP
P3
SENSE
SWITCH
Pin Compatibility
These switches have identical pinouts to common non-
fault-protected CMOS switches (DG401, DG403,
DG405). Exercise care in considering them as direct
replacements in existing printed circuit boards, since
only the NO_ and NC_ pins of each switch are fault pro-
tected.
+V (+15V)
P-CHANNEL
DRIVER
+15V
COMPARATOR
+15V
Normal Operation
Two comparators continuously compare the voltage on
the NO_ (or NC_) pin with V+ and V- supply voltages
(Figure 1). When the signal on NO_ (or NC_) is between
V+ and V-, the switch behaves normally, with FETs N1
and P1 turning on and off in response to NO_ (or NC_)
signals.
Figure 1. Simplified Internal Structure
_______________Detailed Description
The MAX4631/MAX4632/MAX4633 are fault-protected
analog switches with special operation and construc-
tion. Traditional fault-protected switches are construct-
ed using three series CMOS devices. This combination
produces good fault-protection but fairly high on-resis-
tance when the signals are within 3V of each supply
rail. These series devices are not capable of handling
signals up to the power-supply rails.
For any voltage between the supply rails, the switch is
bidirectional; therefore, COM_ and NO_ (or NC_) are
interchangeable. Only NO_ and NC_ can be exposed
to overvoltages beyond the supply range and within the
specified breakdown limits of the device.
These devices differ considerably from traditional fault-
protection switches, with three advantages. First, they
are constructed with two parallel FETs, allowing very low
on-resistance when the switch is on. Second, they allow
signals on the NC_ or NO_ pins that are within or slightly
beyond the supply rails to be passed through the switch
to the COM_ terminal, allowing rail-to-rail signal opera-
tion. Third, when a signal on NC_ or NO_ exceeds the
supply rails by about 50mV (a fault condition), the volt-
age on COM_ is limited to the appropriate polarity sup-
ply voltage. Operation is identical for both fault
polarities. The fault-protection extends to 25V
(MAX4632) or 36V (MAX4631/MAX4633) with power
on and 40V with power off.
Fault Condition
The MAX4631/MAX4632/MAX4633 protect devices
connected to their outputs (COM_) through their unique
fault-protection circuitry. When the input voltage is
raised 50mV above either supply rail, the internal sense
and comparator circuitry (N3 and N-channel driver or
P3 and P-channel driver) disconnect the output (COM_)
from the input (Figure 1).
If the switch driven above the supply rail has an on
state, the clamp circuitry (N2 or P2) connects the out-
put to the appropriate supply rail. Table 1 summarizes
the switches’ operation under normal and fault conditions.
The MAX4631/MAX4632/MAX4633 have a parallel N-
channel and P-channel MOSFET switch configuration with
_______________________________________________________________________________________
9
Fault-Protected, High-Voltage,
Dual Analog Switches
Table 1. Switch States in Normal and Fault Conditions
POWER
INPUT
SUPPLIES
(V+, V-)
NC_
NO_
OUTPUT
RANGE
On
On
On
On
On
On
Between Rails
On
Off
On
Off
On
Off
Off
On
Off
On
Off
On
NC_
NO_
V+
Between Rails
Between V+ and (+40V - V+)
Between V+ and (+40V - V+)
Between V- and (-40V - V-)
Between V+ and (-40V - V-)
V+
V-
V-
Follows the load
terminal voltage
Off
Between Rails
Off
Off
Transient Fault Response and Recovery
When a fast rising and falling transient on NO_ (or NC_)
exceeds V+ or V-, the output (COM_) follows the input
(IN_) to the supply rail with only a few nanoseconds of
delay. This delay is due to the switch on-resistance and
circuit capacitance to ground. However, when the input
transient returns to within the supply rails, there is a
longer output recovery time delay. For positive and
negative faults, the recovery time is typically 2.5µs.
These values depend on the COM_ output resistance
and capacitance, and are not production tested or
guaranteed. The delays are not dependent on the fault
amplitude. Higher COM_ output resistance and capaci-
tance increase recovery times.
Failure Modes
The MAX4631/MAX4632/MAX4633 are not lightning
arrestors or surge protectors. Exceeding the fault-pro-
tection voltage limits on NO_ or NC_, even for very short
periods, can cause the device to fail. The failure modes
may not be obvious, and failure in one switch may or
may not affect other switches in the same package.
__________Applications Information
Ground
There is no connection between the analog signal
paths and GND. The analog signal paths consist of an
N-channel and a P-channel MOSFET with their sources
and drains paralleled and their gates driven out of
phase to V+ and V- by the logic-level translators.
12/MAX463
Fault-Protection Voltage and Power Off
The maximum fault voltage on the NO_ (or NC_) pins is
40V when the power is off. For the MAX4631/
MAX4633, with 15V supplies, the highest voltage on
NO_ (or NC_) can be +36V, and the lowest voltage on
NO (or NC_) can be -36V. For the MAX4632, with 15V
supplies, the highest voltage on NO_ (or NC_) can be
+25V, and the lowest voltage on NO_ (or NC_) can be
-25V. Exceeding these limits can damage the device.
V+ and GND power the internal logic and logic-level
translators and set the input logic thresholds. The logic-
level translators convert the logic levels to switched V+
and V- signals to drive the analog switch gates. This
drive signal is the only connection between the power
supplies and the analog signals. GND, IN_, and COM_
have ESD-protection diodes to V+ and V-.
Supply-Current Reduction
When the logic signals are driven rail-to-rail from 0 to
+12V or -15V to +15V, the supply current reduces to
approximately half of the supply current when the logic
input levels are at 0 to +5V.
IN_ Logic-Level Thresholds
The logic-level thresholds are TTL/CMOS compatible
when V+ is +15V. Raising V+ increases the threshold
slightly; when V+ reaches +25V, the level threshold is
about 2.8V—higher than the TTL output high-level mini-
mum of 2.4V, but still compatible with CMOS outputs
(see Typical Operating Characteristics).
Power Supplies
The MAX4631/MAX4632/MAX4633 operate with bipolar
supplies between 4.5V and 18V. The V+ and V- sup-
plies need not be symmetrical, but their difference can
not exceed the absolute maximum rating of +44V.
These devices operate from a single supply between
+9V and +36V when V- is connected to GND.
Increasing V- has no effect on the logic-level thresh-
olds, but it does increase the gate-drive voltage to the
signal FETs, reducing their on-resistance.
10 ______________________________________________________________________________________
Fault-Protected, High-Voltage,
Dual Analog Switches
12/MAX463
attenuation. At 10MHz, off-isolation is about -46dB in
50Ω systems, declining (approximately 20dB per
decade) as frequency increases. Higher circuit imped-
ance also diminishes off-isolation. Adjacent channel
attenuation is about 3dB above that of a bare IC socket
and is due entirely to capacitive coupling.
High-Frequency Performance
In 50Ω systems, signal response is reasonably flat up
to 30MHz (see Typical Operating Characteristics).
Above 30MHz, the on-response has several minor
peaks that are highly layout dependent. The problem
with high-frequency operation is not turning the switch
on, but turning it off. The off-state switch acts like a
capacitor and passes higher frequencies with less
Test Circuits/Timing Diagrams
V+
V+
V+
V
IN_
50%
50%
NO_ OR NC_
+10V
0V
MAX4631
MAX4632
MAX4633
+10V
V
90%
IN_
IN_
90%
COM_
V-
V
OUT
V
OUT
GND
50Ω
R
L
10pF
0V
V-
t
t
ON
OFF
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 2. Switch Turn-On/Turn-Off Times
t < 5ns
F
50%
R
V+
V+
0V
t < 5ns
V
V
50%
V
IN_
IN_
V+
NO_
NC_
IN_
IN_
+10V
50Ω
, V
MAX4631
NO_ NC_
COM_
COM_
80%
V
OUT
GND
V-
V
OUT
10pF
R
L
0V
V-
t
OPEN
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 3. MAX4631 Break-Before-Make Interval
______________________________________________________________________________________ 11
Fault-Protected, High-Voltage,
Dual Analog Switches
Test Circuits/Timing Diagrams (continued)
V+
V+
V+
0V
V
IN_
IN_
NO_ OR NC_
V
IN_
50Ω
MAX4631
MAX4632
MAX4633
∆ V
OUT
V
OUT
V
COM_
V-
OUT
C
GND
L
100pF
V-
∆ V
IS THE MEASURED VOLTAGE DUE TO CHARGE-
OUT
TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF.
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Q = ∆ V
•
C
OUT L
Figure 4. Charge Injection
V+
V+
NO_
NC_
V+
MAX4631
MAX4632
MAX4633
12/MAX463
1MHz
COM_
IN_
CAPACITANCE
ANALYZER
ADDRESS SELECT
V-
GND
V-
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 5. COM_, NO_, and NC_ Capacitance
12 ______________________________________________________________________________________
Fault-Protected, High-Voltage,
Dual Analog Switches
12/MAX463
Test Circuits/Timing Diagrams (continued)
V+ 10nF
V+
NETWORK
ANALYZER
V
V
50Ω
50Ω
OUT
V
IN
OFF-ISOLATION = 20 log
ON-LOSS = 20 log
V
IN
COM_
MAX4631
MAX4632
MAX4633
OUT
V
IN
V
OUT
MEAS.
REF.
IN_
ADDRESS SELECT
NO_, NC_
V-
GND
50Ω
50Ω
10nF
V-
MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT SOCKET TERMINALS.
OFF-ISOLATION IS MEASURED BETWEEN COM_ AND “OFF” NO_ OR NC_ TERMINALS.
ON LOSS IS MEASURED BETWEEN COM_ AND “ON” NO_ OR NC_ TERMINALS.
SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 6. Frequency Response and Off-Isolation
V+ 10nF
NETWORK
ANALYZER
50Ω
50Ω
50Ω
V
IN
COM_
NO_, NC_
COM_
V
OUT
MEAS.
REF.
NO_, NC_
50Ω
50Ω
MAX4631
MAX4632
MAX4633
2.4V
2.4V
V
IN1
IN2
OUT
CROSSTALK = 20 log
V
IN
V-
GND
10nF
V-
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 7. Crosstalk
______________________________________________________________________________________ 13
Fault-Protected, High-Voltage,
Dual Analog Switches
Pin Configurations/Functional Diagrams/TruthTables
TOP VIEW
COM1
COM1
N.C.
COM1
N.C.
NO1
IN1
V-
NO1
IN1
V-
NO1
IN1
V-
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
16
15
14
13
12
11
10
9
16
15
14
13
12
11
10
9
N.C.
N.C.
N.C.
COM3
NO3
COM3
NC3
GND
N.C.
V+
GND
N.C.
V+
GND
N.C.
V+
NO4
COM4
N.C.
NC4
COM4
N.C.
N.C.
N.C.
MAX4631
MAX4633
MAX4632
IN2
NO2
N.C.
IN2
NO2
IN2
NO2
COM2
COM2
COM2
DIP/SO
DIP/SO
DIP/SO
MAX4631
MAX4632
SWITCHES 1, 2 SWITCHES 3, 4
MAX4633
LOGIC
LOGIC
SWITCH
LOGIC
SWITCH
ON
OFF
OFF
ON
0
1
0
1
OFF
ON
OFF
ON
0
1
SWITCHES SHOWN FOR LOGIC "0" INPUT
N.C. = NOT INTERNALLY CONNECTED
Chip Information
TRANSISTOR COUNT: 223
12/MAX463
14 ______________________________________________________________________________________
Fault-Protected, High-Voltage,
Dual Analog Switches
12/MAX463
Package Information
______________________________________________________________________________________ 15
Fault-Protected, High-Voltage,
Dual Analog Switches
Package Information (continued)
12/MAX463
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.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1999 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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