MAXIM MAX4632CSE

19-1515; Rev 0; 7/99
Fault-Protected, High-Voltage,
Dual Analog Switches
Features
The MAX4631/MAX4632/MAX4633 high-voltage, dual
analog switches are pin compatible with the industry-standard 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 appropriate polarity supply voltage to the load. This ensures unambiguous 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)
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
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.
Applications
ATE Equipment
Data Acquisition
Industrial and Process Control Systems
Avionics
Redundant/Backup Systems
Pin Configurations appear at end of data sheet.
♦ 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
♦ TTL- and CMOS-Logic Compatible Inputs with
Single +9V to +15V, or ±15V Supplies
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX4631CSE
0°C to +70°C
16 Narrow SO
MAX4631CPE
MAX4631ESE
MAX4631EPE
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
16 Plastic DIP
16 Narrow SO
16 Plastic DIP
MAX4631MJE
MAX4632CSE
MAX4632CPE
-55°C to +125°C
0°C to +70°C
0°C to +70°C
16 CERDIP
16 Narrow SO
16 Plastic DIP
MAX4632ESE
MAX4632EPE
MAX4632MJE
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
16 Narrow SO
16 Plastic DIP
16 CERDIP
MAX4633CSE
MAX4633CPE
MAX4633ESE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
16 Narrow SO
16 Plastic DIP
16 Narrow SO
MAX4633EPE
MAX4633MJE
-40°C to +85°C
-55°C to +125°C
16 Plastic DIP
16 CERDIP
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.
MAX4631/MAX4632/MAX4633
General Description
MAX4631/MAX4632/MAX4633
Fault-Protected, High-Voltage,
Dual Analog Switches
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND)
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_
MAX4631_ _E ......................................................-36V to +36V
MAX4632_ _E ......................................................-25V to +25V
MAX4633_ _E ......................................................-36V to +36V
Continuous Current into Any Terminal..............................±30mA
Peak Current into Any Terminal (pulsed at 1ms,
10% duty cycle)............................................................±50mA
Continuous Power Dissipation (TA = +70°C) (Note 2)
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
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, VINL_ = 0.8V, VINH_ = 2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
C, E, M
V-
TYP
MAX
UNITS
V+
V
ANALOG SWITCH
Fault-Free Analog Signal Range
(Note 2)
VNO_, VNC_
+25°C
COM_ to NO_ or NC_
On-Resistance
COM_ to NO_ or NC_
On-Resistance Match
Between Channels (Note 4)
NO_, NC_, COM_ Off-Leakage
Current (Note 5)
COM_ On-Leakage Current
(Note 5)
RON
VCOM_ = ±10V,
ICOM_ = 1mA
62
100
M
200
+25°C
∆RON
VCOM_ = ±10V,
ICOM_ = 1mA
85
C, E
3
6
C, E
10
M
15
+25°C
-0.5
C, E
-5
5
M
-100
100
+25°C
-0.5
C, E
-20
20
M
-100
100
MAX4631/
MAX4633
C, E, M
-36
36
MAX4632
C, E, M
-25
25
C, E, M
-40
40
INO_ (OFF),
INC_ (OFF),
ICOM_(OFF)
VCOM_ = ±14V,
VNO_ or VNC_ = −
+14V
ICOM_(ON)
VCOM_ = ±14V,
VNO_ or VNC_ = ±14V
or floating
0.01
0.01
Ω
Ω
0.5
nA
0.5
nA
FAULT PROTECTION
Fault-Protected Analog
Signal Range (Note 2)
VNO_, VNC_
Applies with
power on
Applies with power off
2
_______________________________________________________________________________________
V
Fault-Protected, High-Voltage,
Dual Analog Switches
(V+ = +15V, V- = -15V, VINL_ = 0.8V, VINH_ = 2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3)
PARAMETER
COM_ Output Leakage Current,
Supplies On
NO_ or NC_ Input Leakage
Current, Supplies On
NO_ or NC_ Input Leakage
Current, Supplies Off
SYMBOL
ICOM_
INO_, INC_
INO_, INC_
COM_ Output Clamp Current,
Supplies On
ICOM_
COM_ Output Clamp Resistance,
Supplies On
RCOM_
CONDITIONS
TA
MIN
VNO_ or VNC_ = ±25V,
no connection to “on” channel
(MAX4632 only)
+25°C
-10
10
C, E
-200
200
VNO_ or VNC_ = ±25V,
VCOM_ = ±10V
TYP
MAX
M
-1
1
+25°C
-20
20
C, E
-200
200
M
-10
10
+25°C
-20
20
VNO_ or VNC_ = ±40V,
C, E
-200
200
M
-10
VNO_ or VNC_ = +25V
+25°C
13
18
24
VNO_ or VNC_ = -25V
+25°C
-24
-18
13
VNO_ or VNC_ = ±25V
+25°C
0.5
1
10
UNITS
nA
µA
nA
µA
nA
µA
mA
kΩ
LOGIC INPUT
IN_ Input Logic Voltage High
VINH_
C, E, M
IN_ Input Logic Voltage Low
VINL_
C, E, M
IN_ Input Current Logic
High or Low
IINH_, IINL_
VIN_ = 0.8V or 2.4V
2.4
V
0.8
+25°C
-1
C, E, M
-5
0.03
1
5
V
µA
SWITCH DYNAMIC CHARACTERISTICS
+25°C
Turn-On Time
tON
VCOM_ = ±10V, RL = 1kΩ,
Figure 2
100
C, E,
500
M
600
+25°C
Turn-Off Time
tOFF
Break-Before-Make Time Delay
(MAX4632 only)
Charge Injection (Note 6)
VCOM_ = ±10V, RL = 1kΩ,
Figure 2
150
50
100
C, E,
400
M
500
tBBM
VCOM_ = ±10V, RL = 1kΩ,
Figure 3
+25°C
Q
CL = 100pF, Figure 4,
NO_ = NC_ = GND, RS = 0
+25°C
5
10
ns
40
ns
ns
10
pC
NO_, NC_ Off- Capacitance
CNC_(OFF),
CNO_(OFF)
NO_ = NC_ = GND, f = 1MHz,
Figure 5
C, E, M
18
pF
COM_ Off-Capacitance
CCOM_(OFF)
COM_ = GND, f = 1MHz,
Figure 5
C, E, M
18
pF
COM_ On-Capacitance
CCOM_(ON)
COM_ = NO_ = NC_ = GND,
f = 1MHz, Figure 5
C, E, M
22
pF
_______________________________________________________________________________________
3
MAX4631/MAX4632/MAX4633
ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
MAX4631/MAX4632/MAX4633
Fault-Protected, High-Voltage,
Dual Analog Switches
ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
(V+ = +15V, V- = -15V, VINL_ = 0.8V, VINH_ = 2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
MAX
UNITS
Off-Isolation
(Note 7)
VISO
RL = 50Ω, CL = 15pF,
VNO_ = VNC_ = 1VRMS,
f = 1MHz, Figure 6
C, E, M
-62
dB
Channel-to-Channel Crosstalk
(Note 8)
VCT
RL = 50Ω, CL = 15pF,
VNO_ = VNC_ = 1VRMS,
f = 1MHz, Figure 7
C, E, M
-66
dB
POWER SUPPLY
Power-Supply Range
V+, V-
C, E, M
V+ Supply Current
I+
V- Supply Current
I-
All VIN_ = 0 or 5V,
VNO_ or VNC_ = 0
C, E, M
All VIN_ = 0 or 15V,
VNO_ or VNC_ = 0
C, E, M
GND Supply Current
IGND
All VIN_ = 5V,
VNO_ or VNC_ = 0
±4.5
+25°C
All VIN_ = 0 or 5V,
VNO_ or VNC_ = 0
C, E, M
325
550
+25°C
+25°C
±18
230
130
200
300
-1
0.01
125
C, E, M
µA
µA
1
10
+25°C
V
175
µA
300
ELECTRICAL CHARACTERISTICS—Single Supply
(V+ = +15V, V- = -15V, VINL_ = 0.8V, VINH_ = 2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
C, E, M
0
TYP
MAX
UNITS
V+
V
ANALOG SWITCH
Fault-Free Analog Signal Range
(Note 2)
VNO_, VNC_
+25°C
COM_ to NO_ or NC_
On-Resistance
COM_ to NO_ or NC_
On-Resistance Match
Between Channels (Note 4)
RON
VCOM_ = 10V,
ICOM_ = 1mA
250
M
300
+25°C
∆RON
VCOM_ = 10V,
ICOM_ = 1mA
COM_ On-Leakage Current
(Notes 5, 9)
4
C, E
VCOM_ = 10V,
VNO_ or VNC_ = 12V
ICOM_(ON)
VCOM_ = 10V,
VNO_ or VNC_ = 1V or 12V
Ω
10
20
M
INO_ (OFF),
INC_ (OFF)
200
C, E
+25°C
NO_, NC_, COM_ Off-Leakage
Current (Notes 5, 9)
125
Ω
30
-0.5
0.01
0.5
C, E
-10
10
M
-200
200
+25°C
-0.5
0.01
nA
0.5
C, E
-20
20
M
-400
400
MAX4631/
MAX4633
C, E, M
-36
36
MAX4632
C, E, M
-25
25
C, E, M
-40
40
nA
FAULT PROTECTION
Fault-Protected Analog
Signal Range (Note 2)
VNO_, VNC_
Applies with
power on
Applies with power off
4
_______________________________________________________________________________________
V
Fault-Protected, High-Voltage,
Dual Analog Switches
(V+ = +15V, V- = -15V, VINL_ = 0.8V, VINH_ = 2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
COM_ Output Leakage Current,
Supplies On
VNO_ or VNC_ = ±25V,
no connection to “on” channel
(MAX4632 only)
C, E
ICOM_
VNO_ or VNC_ = ±25V,
VCOM_ = ±10V
NO_ or NC_ Input Leakage
Current, Supplies On
NO_ or NC_ Input Leakage
Current, Supplies Off
INO_, INC_
INO_, INC_
VNO_ or VNC_ = ±40V
MAX
UNITS
-10
10
nA
M
-1
1
µA
C, E
-100
100
nA
M
-10
10
µA
C, E
-100
100
nA
M
-10
10
µA
4
5.5
10
mA
1
2.5
kΩ
COM_ Output Clamp Current,
Supplies On
ICOM_
VNO_ or VNC_ = 25V
+25°C
COM_ Output Clamp Resistance,
Supplies On
RCOM_
VNO_ or VNC_ = 25V
+25°C
TYP
1
LOGIC INPUT
IN_ Input Logic Voltage High
VINH_
C, E, M
IN_ Input Logic Voltage Low
VINL_
C, E, M
IN_ Input Current Logic
High or Low
IINH_, IINL_
VIN_ = 0.8V or 2.4V
VIN_ = 0.8V or 2.4V
2.4
+25°C
-1
C, E, M
-5
V
0.03
0.8
V
1
µA
5
µA
SWITCH DYNAMIC CHARACTERISTICS
+25°C
Turn-On Time
tON
VCOM_ = ±10V, RL = 2kΩ,
Figure 2
140
C, E,
M
tOFF
Break-Before-Make Time Delay
(MAX4632 only)
Charge Injection (Note 6)
VCOM_ = ±10V, RL = 2kΩ,
Figure 2
100
200
C, E,
250
M
400
tBBM
VCOM_ = ±10V, RL = 2kΩ,
Figure 3
+25°C
Q
CL = 100pF, Figure 4,
NO_ = NC_ = GND, RS = 0
ns
500
+25°C
Turn-Off Time
250
300
5
ns
40
ns
+25°C
5
pC
NO_, NC_ Off-Capacitance
CNC_(OFF),
CNO_(OFF)
NO_ = NC_ = GND,
f = 1MHz, Figure 5
C, E, M
20
pF
COM_ Off-Capacitance
CCOM_(OFF)
COM_ = GND, f = 1MHz,
Figure 5
C, E, M
20
pF
COM_ On-Capacitance
CCOM_(ON)
COM_ = NO_ = NC_ = GND,
f = 1MHz, Figure 5
C, E, M
25
pF
Off-Isolation
(Note 7)
VISO
RL = 50Ω, CL = 15pF,
VNO_ = VNC_ = 1VRMS,
f = 1MHz, Figure 6
C, E, M
-62
dB
Channel-to-Channel Crosstalk
(Note 8)
VCT
RL = 50Ω, CL = 15pF,
VNO_ = VNC_ = 1VRMS,
f = 1MHz, Figure 7
C, E, M
-65
dB
_______________________________________________________________________________________
5
MAX4631/MAX4632/MAX4633
ELECTRICAL CHARACTERISTICS—Single Supply (continued)
ELECTRICAL CHARACTERISTICS—Single Supply (continued)
(V+ = +15V, V- = -15V, VINL_ = 0.8V, VINH_ = 2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
C, E, M
0
TYP
MAX
UNITS
36
V
POWER SUPPLY
Power-Supply Range
V+, V-
GND Supply Current
+25°C
I+
All VIN_ = 0 or 5V,
VNO_ or VNC_ = 0
C, E, M
IGND
All VIN_ = 0 or 5V,
VNO_ or VNC_ = 0
C, E, M
V+ Supply Current
165
250
µA
400
+25°C
165
250
µA
400
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: ∆RON = RON(MAX) - RON(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 = 20log10 [VCOM_ / (VNC_ or VNO_)], VCOM_ = output, VNC_ or VNO_ = input to off switch.
Note 8: Between any two switches.
Note 9: Leakage testing for single-supply operation is guaranteed by testing with dual supplies.
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
120
100
ON-RESISTANCE (Ω)
140
V+ = +12V
V- = -12V
V+ = +10V
V- = -10V
80
60
40
20
TA = +125°C
80
60
40
TA = +25°C
V+ = +15V
V- = -15V
20
V+ = +20V
V- = -20V
0
0
-20
-15
-10
-5
0
VCOM (V)
6
TA = +85°C
100
5
10
15
20
500
TA = -55°C
TA = -40°C
V+ = 15V
V- = -15V
V- = GND
450
V+ = +5V
400
ON-RESISTANCE (Ω)
V+ = +5V
V- = -5V
SWITCH ON-RESISTANCE
vs. VCOM (SINGLE SUPPLY)
MAX4631-33 toc02
180
160
120
MAX4631-33 toc01
200
ON-RESISTANCE vs. VCOM
AND TEMPERATURE (DUAL SUPPLIES)
MAX4631-33 toc03
SWITCH ON-RESISTANCE vs. VCOM
(DUAL SUPPLIES)
ON-RESISTANCE (Ω)
MAX4631/MAX4632/MAX4633
Fault-Protected, High-Voltage,
Dual Analog Switches
350
300
V+ = +8V
V+ = +12V
V+ = +15V
V+ = +20V
V+ = +24V
V+ = +30V
250
200
150
100
50
-15
-10
-5
0
VCOM (V)
5
10
15
0
5
10
15
VCOM (V)
_______________________________________________________________________________________
20
25
30
Fault-Protected, High-Voltage,
Dual Analog Switches
LOGIC-LEVEL THRESHOLD vs. V+
150
130
110
90
TA = -40°C
TA = -55°C
50
2
4
6
8
10
2.0
1.8
1.6
40
20
1.0
5
10
250
15
25
30
35
40
-55 -35 -15
I+ (µA)
IGND
8
-10
-20
-30
12
14
0
16
20
10
12
14
450
400
DUAL SUPPLIES
V+ = +15V
V- = -15V
10
5
SINGLE SUPPLY
V+ = +12V
-5
250
200
NO_ tON
-15
-10
-5
0
VCOM (V)
5
10
15
-80
-110
-120
-100
-120
0.1
450
400
350
100
1000
NO_ tON
250
NC_ tON
200
150
NC_ tON
NO_ tOFF
100
100
NO_ tOFF
50
0
6
NC_ tOFF
50
NC_ tOFF
0
0
-10
OFF-LOSS
300
300
150
0
-20
-40
-60
-100
0.01
TIME (ns)
TIME (ns)
15
-70
-80
-90
16
350
100
80
60
20
0
ON-PHASE
ON/OFF TIME
vs. DUAL-SUPPLY VOLTAGE
8
120
40
-50
-60
ON/OFF TIME
vs. SINGLE-SUPPLY VOLTAGE
6
MAX4631-33 toc11
25
ON-LOSS
1
10
FREQUENCY (MHz)
4
500
MAX4631-33 toc10
30
85 105 125
VIN (V)
2
VIN (V)
CHARGE INJECTION vs. VCOM
65
-40
50
10
45
FREQUENCY RESPONSE
SINGLE SUPPLY
V+ = +12V
V- = GND
150
25
0
0
6
5
TEMPERATURE (°C)
100
100
0
CHARGE INJECTION (pC)
20
DUAL SUPPLIES
V+ = +15V
V- = -15V
200
I-
4
SINGLE SUPPLY
V+ = +12V
V- = GND
0
0
12
MAX4631-33 toc07
SUPPLY CURRENT (µA)
I+
2
60
I+ vs. VIN
V+ = +15V
V- = -15V
0
80
1.2
SUPPLY CURRENT vs. VIN
50
100
V+ (V)
250
150
120
1.4
VCOM (V)
200
140
MAX4631-33 toc12
0
2.2
160
LOSS (dB)
70
2.4
PHASE (DEGREES)
170
2.6
MAX4631-33 toc09
TA = +85°C
DUAL SUPPLIES
V+ = +15V
V- = -15V
180
SUPPLY CURRENT (µA)
TA = +25°C
190
200
MAX4631-33 toc08
ON-RESISTANCE (Ω)
210
SINGLE OR DUAL SUPPLY
2.8
SUPPLY CURRENT vs. TEMPERATURE
MAX4631-33 toc05
TA = +125°C
LOGIC-LEVEL THRESHOLD (V)
V+ = +12V
230
3.0
MAX4631-33 toc04
250
MAX4631-33 toc06
ON-RESISTANCE vs. VCOM
AND TEMPERATURE (SINGLE SUPPLY)
12
18
24
SUPPLY VOLTAGE (V)
30
36
0
2
4
6
8
10 12 14 16 18 20
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
7
MAX4631/MAX4632/MAX4633
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
ON/OFF TIME vs. TEMPERATURE
LEAKAGE CURRENT vs. TEMPERATURE
1
0.1
0.01
-55 -35 -15
5
25
45
65
MAX4631-33 toc14
150
130
tON
110
tOFF
90
70
50
-55 -35 -15
85 105 125
5
INPUT OVERVOLTAGE vs.
OUTPUT CLAMPING (±15V SUPPLIES)
65
85 105 125
-10
-20
+20
0
-20
VCOM
0
-10
+10
VNO
0
+10
INPUT OVERVOLTAGE (V)
+10
VCOM
45
FAULT-FREE SIGNAL
(±15V SUPPLIES)
MAX4631-33 toc15
+20
INPUT OVERVOLTAGE (V)
25
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX4631-33 toc16
10
ICOM (OFF) AT
VNO = +14V,
VCOM = -14V
ICOM (ON) AT
VCOM = +14V
INO (OFF) AT
VNO = -14V,
VCOM = +14V
INO (OFF) AT
VNO = +14V,
VCOM = -14V
ICOM (OFF) AT
VNO = -14V,
VCOM = +14V
TIME (ns)
LEAKAGE CURRENT (nA)
100
ICOM (ON) AT
VCOM = -14V
170
MAX4631-33 toc13
1000
VNO
MAX4631/MAX4632/MAX4633
Fault-Protected, High-Voltage,
Dual Analog Switches
0
-10
OUTPUT CLAMPING
(20µs/div)
OUTPUT CLAMPING
(20µs/div)
Pin Description
PIN
8
NAME
MAX4631
MAX4632
MAX4633
1, 8
1, 8
1, 8
COM1, COM2
FUNCTION
Analog Switch Common Terminals
16, 9
16, 9
16, 9
NO1, NO2
15, 10
15, 10
15, 10
IN1, IN2
Analog Switch Normally Open Terminals
2–7, 12
2, 7, 12
2, 7, 12
N.C.
—
3, 6
3, 6
COM3, COM4
—
4, 5
—
NC3, NC4
Analog Switch Normally Closed Terminals
—
—
4, 5
NO3, NO4
Analog Switch Normally Open Terminals
11
11
11
V+
13
13
13
GND
14
14
14
V-
Logic-Control Digital Inputs
No Connection. Not internally connected.
Analog Switch Common Terminals
Positive Supply Input
Ground
Negative Supply Input
_______________________________________________________________________________________
Fault-Protected, High-Voltage,
Dual Analog Switches
-15V
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 sample the input voltage and compare it against the powersupply rails.
COMPARATOR
N3
N-CHANNEL
DRIVER
SENSE
SWITCH
-V (-15V)
CLAMP N2
NC_
or INPUT
NO_
N1
P1
P3
OUTPUT COM_
CLAMP P2
SENSE
SWITCH
+V (+15V)
+15V
+15V
P-CHANNEL
DRIVER
COMPARATOR
Figure 1. Simplified Internal Structure
_______________Detailed Description
The MAX4631/MAX4632/MAX4633 are fault-protected
analog switches with special operation and construction. Traditional fault-protected switches are constructed using three series CMOS devices. This combination
produces good fault-protection but fairly high on-resistance 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.
These devices differ considerably from traditional faultprotection 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 operation. Third, when a signal on NC_ or NO_ exceeds the
supply rails by about 50mV (a fault condition), the voltage on COM_ is limited to the appropriate polarity supply 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.
The MAX4631/MAX4632/MAX4633 have a parallel Nchannel and P-channel MOSFET switch configuration with
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
exceeds either supply rail by about 50mV, the parallel
combination switches (N1, P1) are forced off through
the driver and sensing circuitry. At the same time, the
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.
Pin Compatibility
These switches have identical pinouts to common nonfault-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 protected.
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.
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.
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 output to the appropriate supply rail. Table 1 summarizes
the switches’ operation under normal and fault conditions.
_______________________________________________________________________________________
9
MAX4631/MAX4632/MAX4633
-15V
MAX4631/MAX4632/MAX4633
Fault-Protected, High-Voltage,
Dual Analog Switches
Table 1. Switch States in Normal and Fault Conditions
POWER
SUPPLIES
(V+, V-)
INPUT
RANGE
NC_
On
Between Rails
On
Off
NC_
On
Between Rails
Off
On
NO_
On
Between V+ and (+40V - V+)
On
Off
V+
On
Between V+ and (+40V - V+)
Off
On
V+
On
Between V- and (-40V - V-)
On
Off
V-
On
Between V+ and (-40V - V-)
Off
On
V-
Off
Between Rails
Off
Off
Follows the load
terminal voltage
NO_
OUTPUT
Transient Fault Response and Recovery
Failure Modes
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 capacitance increase recovery times.
The MAX4631/MAX4632/MAX4633 are not lightning
arrestors or surge protectors. Exceeding the fault-protection 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.
Fault-Protection Voltage and Power Off
__________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.
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 logiclevel 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-.
IN_ Logic-Level Thresholds
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.
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 minimum of 2.4V, but still compatible with CMOS outputs
(see Typical Operating Characteristics).
Increasing V- has no effect on the logic-level thresholds, but it does increase the gate-drive voltage to the
signal FETs, reducing their on-resistance.
10
Supply-Current Reduction
Power Supplies
The MAX4631/MAX4632/MAX4633 operate with bipolar
supplies between ±4.5V and ±18V. The V+ and V- supplies 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.
______________________________________________________________________________________
Fault-Protected, High-Voltage,
Dual Analog Switches
attenuation. At 10MHz, off-isolation is about -46dB in
50Ω systems, declining (approximately 20dB per
decade) as frequency increases. Higher circuit impedance also diminishes off-isolation. Adjacent channel
attenuation is about 3dB above that of a bare IC socket
and is due entirely to capacitive coupling.
Test Circuits/Timing Diagrams
V+
V+
V+
NO_ OR NC_
VIN_
+10V
50%
50%
0V
VIN_
IN_
MAX4631
MAX4632
MAX4633 COM_
GND
50Ω
V-
+10V
90%
90%
VOUT
RL
VOUT
10pF
0V
V-
tON
tOFF
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 2. Switch Turn-On/Turn-Off Times
V+
VIN_
VIN_
V+
50Ω
IN_
NO_
IN_
NC_
+10V
50%
0V
VNO_, VNC_
MAX4631
COM_
80%
VOUT
COM_
GND
tR < 5ns
tF < 5ns
50%
V+
VRL
V-
10pF
VOUT
0V
tOPEN
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 3. MAX4631 Break-Before-Make Interval
______________________________________________________________________________________
11
MAX4631/MAX4632/MAX4633
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
MAX4631/MAX4632/MAX4633
Fault-Protected, High-Voltage,
Dual Analog Switches
Test Circuits/Timing Diagrams (continued)
V+
VIN_
V+
V+
IN_
50Ω
NO_ OR NC_
VIN_
0V
MAX4631
MAX4632
MAX4633
VOUT
COM_
GND
∆ VOUT
VOUT
CL
100pF
V-
V-
∆ VOUT IS THE MEASURED VOLTAGE DUE TO CHARGETRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF.
Q = ∆ VOUT • CL
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 4. Charge Injection
V+
V+
NO_
V+
ADDRESS SELECT
IN_
MAX4631
MAX4632
MAX4633
GND
NC_
COM_
1MHz
CAPACITANCE
ANALYZER
V-
VV- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 5. COM_, NO_, and NC_ Capacitance
12
______________________________________________________________________________________
Fault-Protected, High-Voltage,
Dual Analog Switches
V+ 10nF
NETWORK
ANALYZER
V+
50Ω
VIN
50Ω
COM_
ADDRESS SELECT
MAX4631
MAX4632
MAX4633
IN_
VOUT
NO_, NC_
MEAS.
V-
GND
OFF-ISOLATION = 20 log
VOUT
VIN
ON-LOSS = 20 log
VOUT
VIN
REF.
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
VIN
COM_
VOUT
NO_, NC_
COM_
50Ω
MEAS.
REF.
50Ω
MAX4631
MAX4632
MAX4633
2.4V
50Ω
NO_, NC_
50Ω
2.4V
IN1
IN2
CROSSTALK = 20 log
VOUT
VIN
V-
GND
10nF
VV- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 7. Crosstalk
______________________________________________________________________________________
13
MAX4631/MAX4632/MAX4633
Test Circuits/Timing Diagrams (continued)
Fault-Protected, High-Voltage,
Dual Analog Switches
MAX4631/MAX4632/MAX4633
Pin Configurations/Functional Diagrams/Truth Tables
TOP VIEW
COM1 1
16 NO1
COM1 1
N.C. 2
N.C. 2
15 IN1
N.C. 3
14 V-
N.C. 4
13 GND
NC3 4
12 N.C.
NC4 5
N.C. 5
MAX4631
N.C. 6
11 V+
N.C. 7
10 IN2
COM2 8
9
NO2
14 V-
COM1 1
16 NO1
N.C. 2
15 IN1
COM3 3
14 V-
13 GND
NO3 4
13 GND
MAX4632 12 N.C.
NO4 5
MAX4633 12 N.C.
COM4 6
11 V+
N.C. 7
10 IN2
COM2 8
9
NO2
COM4 6
11 V+
N.C. 7
10 IN2
COM2 8
9
DIP/SO
MAX4631
LOGIC
SWITCH
1
15 IN1
COM3 3
DIP/SO
0
16 NO1
OFF
ON
LOGIC
0
1
DIP/SO
MAX4632
SWITCHES 1, 2 SWITCHES 3, 4
OFF
ON
NO2
MAX4633
LOGIC
SWITCH
ON
OFF
SWITCHES SHOWN FOR LOGIC "0" INPUT
0
1
OFF
ON
N.C. = NOT INTERNALLY CONNECTED
Chip Information
TRANSISTOR COUNT: 223
14
______________________________________________________________________________________
Fault-Protected, High-Voltage,
Dual Analog Switches
SOICN.EPS
______________________________________________________________________________________
15
MAX4631/MAX4632/MAX4633
Package Information
Fault-Protected, High-Voltage,
Dual Analog Switches
PDIPN.EPS
MAX4631/MAX4632/MAX4633
Package Information (continued)
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.