MAXIM MAX4508CSE

19-1414; Rev 5; 10/07
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
The MAX4508/MAX4509 are 8-to-1 and dual 4-to-1 faultprotected multiplexers that are pin compatible with the
industry-standard DG508/DG509. The MAX4508/
MAX4509 operate with dual supplies of ±4.5V to ±20V or
a single supply of +9V to +36V. These multiplexers feature fault-protected inputs, rail-to-rail signal handling
capability, and overvoltage clamping at 150mV beyond
the rails.
Both parts offer ±40V overvoltage protection with supplies off and ±25V protection with supplies on. Onresistance is 400Ω max and is matched between
channels to 15Ω max. All digital inputs have TTL logic
thresholds, ensuring both TTL and CMOS logic compatibility when using a single +12V supply or dual ±15V
supplies.
Features
♦ ±40V Fault Protection with Power Off
±25V Fault Protection with ±15V Supplies
♦ Rail-to-Rail Signal Handling
♦ No Power-Supply Sequencing Required
♦ All Channels Off with Power Off
♦ Output Clamped to Appropriate Supply Voltage
During Fault Condition
♦ 1kΩ Output Clamp Resistance During
Overvoltage
Ω max On-Resistance
♦ 400Ω
♦ 20ns Fault-Response Time
♦ ±4.5V to ±20V Dual Supplies
+9V to +36V Single Supply
♦ TTL/CMOS-Compatible Logic Inputs
Applications
Ordering Information
Data-Acquisition Systems
PART
TEMP
RANGE
MAX4508CSE+
MAX4508CPE+
MAX4508C/D
Industrial and Process Control
Avionics
Signal Routing
Redundant/Backup Systems
Functional Diagrams/Truth Tables appear at end of
data sheet.
PINPACKAGE
PKG
CODE
0°C to +70°C
16 Narrow SO
S16-8
0°C to +70°C
16 Plastic DIP
P16-4
0°C to +70°C
Dice*
—
MAX4508ESE+
-40°C to +85°C 16 Narrow SO
S16-8
MAX4508EPE+
-40°C to +85°C 16 Plastic DIP
P16-4
MAX4508MJE
-40°C to +85°C 16 CERDIP**
J16-3
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
**Contact factory for availability.
+Denotes a lead-free package.
Pin Configurations/Functional Diagrams
TOP VIEW
MAX4508
A0 1
EN 2
V- 3
LOGIC
MAX4509
16 A1
A0 1
15 A2
EN 2
14 GND
V- 3
16 A1
15 GND
LOGIC
14 V+
NO1 4
13 V+
NO1A 4
13 NO1B
NO2 5
12 NO5
NO2A 5
12 NO2B
NO3 6
11 NO6
NO3A 6
11 NO3B
NO4 7
10 NO7
NO4A 7
10 NO4B
COM 8
9
NO8
COMA 8
9
SO/DIP
COMB
SO/DIP
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX4508/MAX4509
General Description
MAX4508/MAX4509
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
ABSOLUTE MAXIMUM RATINGS
(Voltages Referenced to GND)
V+ ........................................................................-0.3V to +44.0V
V- .........................................................................-44.0V to +0.3V
V+ to V-................................................................-0.3V to +44.0V
COM_, A_ (Note 1) .............................. (V+ + 0.3V) to (V- - 0.3V)
NO_.........................................................(V+ - 40V) to (V- + 40V)
NO_ to COM_ ..........................................................-36V to +36V
NO_ Overvoltage with Switch Power On. ................-30V to +30V
NO_ Overvoltage with Switch Power Off. ................-40V to +40V
Continuous Current into Any Terminal..............................±30mA
Peak Current, into Any Terminal
(pulsed at 1ms, 10% duty cycle).................................±100mA
Continuous Power Dissipation (TA = +70°C)
16 Narrow SO (derate 8.70mW/°C above +70°C) ........696mW
16-Pin PDIP (derate 10.53mW/°C above +70°C)..........842mW
16-Pin CERDIP (derate 10.00mW/°C above +70°C).....800mW
Operating Temperature Ranges
MAX4508C_ E/MAX4509C_E...............................0°C to +70°C
MAX4508E_ E/MAX4509E_E ............................-40°C to +85°C
MAX4508MJE/MAX4509MJE..........................-55°C to +125°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: COM_, EN, and A_ pins are not fault protected. Signals on COM_, EN, or A_ 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—Dual Supplies
(V+ = +15V, V- = -15V, VA_H =+2.4V, VA_L = +0.8V, VEN = +2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
C, E, M
V-
TYP
MAX
UNITS
V+
V
ANALOG SWITCH
Fault-Free Analog Signal Range
(Notes 3, 4)
VNO_
V+ = +15V, V- = -15V,
VNO_= ±15V
On-Resistance
RON
VCOM_ = ±10V, INO_ = 0.2mA
300
+25°C
On-Resistance Match Between
Channels (Note 5)
NO_ Off-Leakage Current
(Note 6)
ΔRON
INO_(OFF)
VCOM_ = ±10V, INO_ = 0.2mA
–
VNO_ = ±10V, VCOM_ = +10V
MAX4508
COM_ Off-Leakage Current
(Note 6)
ICOM_(OFF)
VCOM_ = ±10V,
–
VNO_ = +10V
MAX4509
MAX4508
COM_ On-Leakage Current
(Note 6)
ICOM_(ON)
VCOM_ = ±10V,
VNO_ = ±10V or
floating
MAX4509
2
400
C, E
500
M
700
+25°C
15
C, E
20
M
25
+25°C
-0.5
C, E
-5
+5
M
-50
+50
Ω
+0.5
+25°C
-2
+2
C, E
-20
+75
M
-200
+200
+25°C
-1
+1
C, E
-100
+75
M
-100
+100
+25°C
-2
+2
C, E
-100
+75
M
-300
+300
+25°C
-1
+1
C, E
-15
+75
M
-150
+150
_______________________________________________________________________________________
Ω
nA
nA
nA
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
(V+ = +15V, V- = -15V, VA_H = +2.4V, VA_L = +0.8V, VEN = +2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
MAX
UNITS
FAULT PROTECTION
Fault-Protected Analog Signal
Range (Notes 3, 4)
VNO_
Applies with power on, Figure 9
Applies with power off
+25°C
+25°C
COM_ Output Leakage Current,
Supplies On
NO_ Input Leakage Current,
Supplies On
NO_ Input Leakage Current,
Supplies Off
ICOM_
INO_
INO_
VNO_= ±25V, VEN = 0
–
VNO_= ±25V, VCOM_ = +10V,
VEN = 0
VNO_= ±40V, VCOM = 0,
V+ = 0, V- = 0
VNO_ = +25V
-25
+25
-40
+40
-20
+20
C, E
-1
+1
M
-100
+100
V
nA
µA
+25°C
-20
+20
C, E
-200
+200
M
-50
+50
µA
+25°C
-20
+20
nA
C, E
-5
+5
M
-100
+100
7
10
13
-13
-11
-7
100
1.0
2.5
nA
µA
COM_ On Clamp Output
Current, Supplies On
ICOM_
VCOM = 0
COM_ On Clamp Output
Resistance, Supplies On
RCOM_
VNO_ = ±25V
+25°C
± Fault Output Clamp Turn-On
Delay (Note 4)
RL = 10kΩ, VNO_ = ±25V
+25°C
20
ns
± Fault Recovery Time (Note 4)
RL = 10kΩ, VNO_ = ±25V
+25°C
2.5
µs
VNO_ = -25V
+25°C
mA
kΩ
LOGIC INPUT
A_ Input Logic Threshold High
VA_H
C, E, M
A_ Input Logic Threshold Low
VA_L
C, E, M
A_ Input Current Logic
High or Low
IA_H, IA_L
VA_= 0.8V or 2.4V
C, E, M
2.4
V
-1
0.8
V
+1
µA
SWITCH DYNAMIC CHARACTERISTICS
+25°C
Enable Turn-On Time
tON
VNO_ = ±10V, RL = 1kΩ,
Figures 2 and 3
160
C, E
M
Transition Time
tTRANS
Figure 2
Break-Before-Make Time Delay
(Note 4)
Charge Injection (Note 4)
Off-Isolation (Note 7)
tOFF
tBBM
Q
VISO
VNO_ = ±10V, RL = 1kΩ,
Figures 2 and 3
ns
600
+25°C
170
C, E, M
350
500
+25°C
Enable Turn-Off Time
275
400
120
200
C, E
250
M
400
VNO_ = ±10V, RL = 1kΩ,
Figure 4
C, E, M
CL = 1.0nF, VNO_ = 0, RS = 0,
Figure 5
+25°C
2
RL = 75Ω, CL = 15pF,
VNO_ = 1VRMS, f = 1MHz, Figure 6
+25°C
-70
10
ns
80
ns
ns
10
pC
dB
_______________________________________________________________________________________
3
MAX4508/MAX4509
ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
MAX4508/MAX4509
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
(V+ = +15V, V- = -15V, VA_H = +2.4V, VA_L = +0.8V, VEN = +2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 2)
PARAMETER
Channel-to-Channel Crosstalk
(Note 8)
NO_ Off-Capacitance
SYMBOL
CONDITIONS
TA
VCT
RL = 75Ω, CL = 15pF,
VNO_ = 1VRMS, f = 1MHz, Figure 7
+25°C
-62
dB
f = 1MHz, Figure 8
+25°C
10
pF
CN_(OFF)
COM_ Off-Capacitance
CCOM_(OFF) f = 1MHz, Figure 8
COM_ On-Capacitance
CCOM_(ON) f = 1MHz, Figure 8
MAX4508
MAX4509
MAX4508
MAX4509
MIN
TYP
MAX
19
+25°C
pF
14
28
+25°C
UNITS
pF
22
POWER SUPPLY
Power-Supply Range
V+, V-
C, E, M
±4.5
+25°C
V+ Supply Current
I+
All VA_ = 0 or 5V, VNO_ = 0,
VEN = 5V
370
GND Supply Current
I-
IGND
All VA_ = 0 or 5V, VNO_ = 0,
VEN = 5V
750
M
850
All VA_ = 0 or 5V, VNO_ = 0,
VEN = 5V
200
400
M
500
+25°C
200
µA
300
C, E
C, E, M
V
500
C, E
+25°C
V- Supply Current
±20
300
500
µA
µA
ELECTRICAL CHARACTERISTICS—Single +12V Supply
(V+ = +12V, V- = 0, VA_H = +2.4V, VA_L = +0.8V, VEN = +2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
C, E, M
0
TYP
MAX
UNITS
V+
V
ANALOG SWITCH
Fault-Free Analog Signal Range
(Note 3)
VNO_
V+ = 12V, V- = 0, VNO_ = 12V
On-Resistance
RON
VCOM_ = +10V, INO_ = 200µA
650
+25°C
ΔRON
VCOM_ = 10V, INO_ = 200µA
10
4
INO_(OFF)
VCOM_ = 10V, 1V;
VNO_ = 1V, 10V
35
50
C, E
Ω
75
M
NO_ Off-Leakage Current
(Notes 6, 9)
Ω
1300
M
+25°C
On-Resistance Match Between
Channels (Note 5)
950
1100
C, E
+25°C
-0.5
C, E
-10
+10
M
-200
+200
0.01
_______________________________________________________________________________________
+0.5
nA
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
(V+ = +12V, V- = 0, VA_H = +2.4V, VA_L = +0.8V, VEN = +2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MAX4508
COM_ Off-Leakage Current
(Note 6)
VCOM_ = 10V, 1V;
ICOM_(OFF)
VNO_ = 1V, 10V
MAX4509
MAX4508
COM_ On-Leakage Current
(Note 6)
ICOM_(ON)
VCOM_ = 10V, 1V;
VNO_ = 10V, 1V, or
floating
MAX4509
TA
MIN
+25°C
-2
TYP
MAX
UNITS
+2
C, E
-20
+75
M
-200
+200
+25°C
-1
+1
C, E
-10
+75
M
-100
+100
+25°C
-2
+2
C, E
-100
+75
M
-300
+300
+25°C
-1
+1
C, E
-15
+75
M
-150
+150
-25
+25
-40
+40
-20
+20
nA
nA
FAULT PROTECTION
Fault-Protected Analog Signal
Range (Notes 3, 10)
VNO_
Applies with all power on
Applies with all power off
+25°C
+25°C
COM_ Output Leakage Current,
Supply On (Notes 3, 10)
NO_ Input Leakage Current,
Supply On (Notes 3, 10)
NO_ Input Leakage Current,
Supply Off (Notes 3, 10)
ICOM_
INO_
INO_
VNO_ = ±25V, V+ = 12V
VNO_ = ±25V, VCOM_ = 0,
V+ = 12V
VNO_= ±40V, V+ = 0, V- = 0
C, E
-1
+1
M
-100
+100
+25°C
-20
+20
C, E
-5
+5
M
-100
+100
+25°C
-20
0.1
+20
V
nA
µA
nA
µA
nA
C, E
-5
+5
M
-100
+100
µA
µA
2
3
5
mA
2.4
6
kΩ
1.8
2.4
V
COM_ ON Output Current,
Supply On
ICOM_
VNO_ = 25V, V+ = 12V
+25°C
COM_ ON Output Resistance,
Supply On
RCOM_
VNO_ = 25V, V+ = 12V
+25°C
LOGIC INPUT
A_ Input Logic Threshold High
VIN_H
C, E, M
A_ Input Logic Threshold Low
VIN_L
C, E, M
0.8
1.8
A_ Input Current Logic
High or Low
IINH_,
IINL_
C, E, M
-1
0.03
VIN_= 0.8V or 2.4V
V
+1
µA
_______________________________________________________________________________________
5
MAX4508/MAX4509
ELECTRICAL CHARACTERISTICS—Single +12V Supply (continued)
MAX4508/MAX4509
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
ELECTRICAL CHARACTERISTICS—Single +12V Supply (continued)
(V+ = +12V, V- = 0, VA_H = +2.4V, VA_L = +0.8V, VEN = +2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
MAX
UNITS
SWITCH DYNAMIC CHARACTERISTICS
+25°C
220
Enable Turn-On Time
tON
VCOM_ = 10V, RL = 2kΩ,
Figure 3
C, E, M
Enable Turn-Off Time
tOFF
VCOM_ = 10V, RL = 2kΩ,
Figure 3
C, E, M
Break-Before-Make Time Delay
(Note 4)
tBBM
VCOM_ = 10V, RL = 2kΩ,
Figure 4
+25°C
CL = 1.0nF, VNO_ = 0, RS = 0,
Figure 5
+25°C
2
Charge Injection
(Note 4)
NO_ Off-Capacitance
Q
500
700
+25°C
100
250
350
50
100
ns
ns
ns
10
pC
CNO_(OFF) VNO_ = 0, f = 1MHz, Figure 8
+25°C
10
pF
COM_ Off-Capacitance
CCOM_(OFF) VCOM_ = 0, f = 1MHz, Figure 8
+25°C
19
pF
COM_ On-Capacitance
CCOM_(ON)
VCOM_ = VNO_ = 0, f = 1MHz,
Figure 8
+25°C
28
pF
Off-Isolation
(Note 7)
VISO
RL = 75Ω, CL = 15pF,
VNO_ = 1VRMS, f = 1MHz, Figure 6
+25°C
-70
dB
Channel-to-Channel Crosstalk
(Note 8)
VCT
RL = 75Ω, CL = 15pF,
VNO_ = 1VRMS, f = 1MHz, Figure 7
+25°C
-62
dB
POWER SUPPLY
Power-Supply Range
V+ Supply Current
V+
I+
C, E, M
All VA_ = 0 or 5V,
VNO_ = 0, VEN = 5V
All VA_ = 0 or V+,
VNO_ = 0, VEN = 0 or V+
+25°C
9
36
200
C, E, M
+25°C
675
100
C, E, M
V
300
250
µA
375
The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
NO_ pins are fault protected and COM_ pins are not fault protected. The max input voltage on NO_ pins depends on the
COM_ load configuration. Generally, the max input voltage is ±36V with ±15V supplies and a load referred to ground. For
more detailed information see the NO_ Input Voltage section.
Note 4: Guaranteed by design.
Note 5: ΔRON = RON(MAX) - RON(MIN).
Note 6: Leakage parameters are 100% tested at the maximum rated hot temperature and guaranteed by correlation at TA = +25°C.
Note 7: Off-Isolation = 20log10 (VCOM_ / VNO_ ), where VCOM_ = output and VNO_ = input to off switch.
Note 8: Between any two analog inputs.
Note 9: Leakage testing for single-supply operation is guaranteed by testing with dual supplies.
Note 10: Guaranteed by testing with dual supplies.
Note 2:
Note 3:
6
_______________________________________________________________________________________
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
900
700
RON (Ω)
V+ = +15V
V- = -15V
500
600
V+ = +20V
500
300
+25°C
200
-40°C
300
200
200
V+ = +20V
V- = -20V
100
0
0
-10
-5
0
5
10
15
20
0
5
10
15
VCOM (V)
+125°C
800
LEAKAGE (A)
+25°C
500
V+ = +15V
V- = -15V
VCOM = 10V
VNO = ±10V
100n
10n
+70°C
600
-40°C
-10
-5
-55°C
0
5
ICOM_ON
2.5
V+ = +15V
V- = -15V
2.0
INO_OFF
200
DUAL
SUPPLIES
1.5
0.5
1p
0.1p
2
4
6
8
VCOM (V)
10
12
14
0
-55
ENABLE ON AND OFF TIMES vs.
SUPPLY VOLTAGE (DUAL SUPPLIES)
VNO_ = ±10V
700
600
-5
20
45
70
95
120 145
-15
tOFF
200
VNO_ = +10V
150
tOFF
300
0
±2 ±4 ±6 ±8 ±10 ±12 ±14 ±16 ±18 ±20
SUPPLY VOLTAGE (V)
15
V+ = +15V
V- = -15V
250
tON
150
100
100
tOFF
50
0
0
10
200
tON
200
50
100
5
ENABLE ON AND OFF TIMES
vs. TEMPERATURE
tON, tOFF (ns)
tON
300
0
ENABLE ON AND OFF TIMES vs.
SUPPLY VOLTAGE (SINGLE SUPPLY)
300
tON, tOFF (ns)
400
-5
VCOM (V)
250
500
-10
TEMPERATURE (°C)
350
MAX4508/09toc07
800
-30
MAX4508/09toc08
0
SINGLE
SUPPLY
MAX4508/09toc09
0
15
1.0
10p
100
10
CHARGE INJECTION vs. VCOM
ICOM_OFF
1n
100p
400
300
-15
40
VCOM (V)
1μ
+85°C
700
35
LEAKAGE CURRENT vs. TEMPERATURE
MAX4508/09toc04
900
30
±
V+ = +12V
V- = 0
25
VCOM (V)
ON-RESISTANCE vs. VCOM AND
TEMPERATURE (SINGLE SUPPLY)
1000
20
Q (pC)
-15
MAX4508/09toc05
-20
-55°C
100
V+ = +36V
100
0
+85°C
+70°C
V+ = +30V
400
300
RON (Ω)
+125°C
400
MAX4508/09toc06
600
V+ = +12V
V+ = +15V
RON (Ω)
V+ = +10V
V- = -10V
400
tON, tOFF (ns)
V+ = +15V
V- = -15V
500
800
700
RON (Ω)
V+ = +9V
1000
600
MAX4508/09toc02
V+ = +4.5V
V- = -4.5V
800
1100
MAX4508/09toc01
1000
900
ON-RESISTANCE vs. VCOM AND
TEMPERATURE (DUAL SUPPLIES)
ON-RESISTANCE vs.
VCOM (SINGLE SUPPLY)
MAX4508/09toc03
ON-RESISTANCE vs.
VCOM (DUAL SUPPLIES)
0
0
5
10
15
20
25
SUPPLY VOLTAGE (V)
30
35
-55
-25
5
35
65
95
125
TEMPERATURE (°C)
_______________________________________________________________________________________
7
MAX4508/MAX4509
Typical Operating Characteristics
(V+ = +15V, V- = -15V, VEN = +2.4V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(V+ = +15V, V- = -15V, VEN = +2.4V, TA = +25°C, unless otherwise noted.)
POWER-SUPPLY CURRENT
vs. TEMPERATURE (VA = 0)
100
IGND
0
-100
I-
-200
400
200
IGND
0
-200
-400
I-
-600
-300
-55
-30
-5
20
45
70
95
-60 -40 -20 0
120 145
LOGIC-LEVEL THRESHOLD
vs. SUPPLY VOLTAGE
FREQUENCY RESPONSE
20
MAX4508/09toc12
3.0
V- = GND
2.5
BANDWIDTH
-20
LOSS (dB)
SINGLE
SUPPLY
1.5
V+ = +15V
V- = -15V
0
DUAL
SUPPLIES
2.0
20 40 60 80 100 120 140
TEMPERATURE (°C)
TEMPERATURE (°C)
-40
CROSSTALK
1.0
-60
0.5
-80
0
OFF-ISOLATION
-100
5
10
15
20
25
30
35
40
0.001
0.01
0.1
1
10
100
1000
FREQUENCY (MHz)
FAULT-FREE SIGNAL PERFORMANCE
INPUT OVERVOLTAGE vs. OUTPUT CLAMPING
+15V
IN_
0V
10V/div
-15V
MAX4508/09toc16
SUPPLY VOLTAGE (V)
MAX4508/09toc14
0
+25V
IN_
0V
+15V
+15V
COM_
-25V
0V
0V
0V
COM_
10V/div
-15V
-15V
5μs/div
FAULT-FREE RAIL-TO-RAIL SIGNAL HANDLING
WITH ±15V SUPPLIES
8
MAX4508/09toc11
V+ = +15V
V- = -15V
VA = +5V
I+
MAX4508/09taoc13
I+, I-, IGND (μA)
200
600
SUPPLY CURRENT I+, I-, IGND (μA)
V+ = +15V
V- = -15V
VA = 0
I+
POWER-SUPPLY CURRENT
vs. TEMPERATURE (VA = +5V)
MAX4508/09toc10
300
LOGIC-LEVEL THRESHOLD (V)
MAX4508/MAX4509
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
5μs/div
±25V OVERVOLTAGE INPUT WITH THE OUTPUT
CLAMPED AT ±15V
_______________________________________________________________________________________
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
MAX4508 (Single 8-to-1 Mux)
PIN
NAME
MAX4509 (Dual 4-to-1 Mux)
PIN
FUNCTION
NAME
FUNCTION
1
A0
Address Bit 0
1
A0
Address Bit 0
2
EN
Mux Enable
2
EN
Mux Enable
3
V-
Negative Supply Voltage
3
V-
Negative Supply Voltage
4
NO1
Channel Input 1
4
NO1A
Channel Input 1A
5
NO2
Channel Input 2
5
NO2A
Channel Input 2A
6
NO3
Channel Input 3
6
NO3A
Channel Input 3A
7
NO4
Channel Input 4
7
NO4A
Channel Input 4A
8
COM
Analog Output
8
COMA
Mux Output A
9
NO8
Channel Input 8
9
COMB
Mux Output B
10
NO7
Channel Input 7
10
NO4B
Channel Input 4B
11
NO6
Channel Input 6
11
NO3B
Channel Input 3B
12
NO5
Channel Input 5
12
NO2B
Channel Input 2B
13
V+
Positive Supply Voltage
13
NO1B
Channel Input 1B
14
GND
Ground
14
V+
15
A2
Address Bit 2
15
GND
16
A1
Address Bit 1
16
A1
Truth Tables
MAX4508 (Single 8-to-1 Mux)
A2
A1
A0
EN
ON SWITCH
x
x
x
0
None
0
0
0
1
NO1
0
0
1
1
NO2
0
1
0
1
NO3
0
1
1
1
NO4
1
0
0
1
NO5
1
0
1
1
NO6
1
1
0
1
NO7
1
1
1
1
NO8
MAX4509 (Dual 4-to-1 Mux)
A1
A0
EN
COMA
COMB
x
x
0
None
None
0
0
1
NO1A
NO1B
0
1
1
NO2A
NO2B
1
0
1
NO3A
NO3B
1
1
1
NO4A
NO4B
Positive Supply Voltage
Ground
Address Bit 1
Detailed Description
Traditional fault-protected multiplexers are constructed
with three series FET switches. This produces good off
protection, but limits the switches input voltage range
to as much as 3V below the supply rails, reducing its
usable dynamic range. As the voltage on one side of
the switch approaches within about 3V of either supply
rail (a fault condition), the switch impedance increases,
limiting the output signal range to approximately 3V
less than the appropriate polarity supply voltage.
The MAX4508/MAX4509 differ considerably from traditional fault-protected multiplexers, offering several
advantages. First, they are constructed with two parallel FETs, allowing very low resistance when the switch
is on. Second, they allow signals on the NO_ pins that
are within or beyond the supply rails to be passed
through the switch to the COM terminal. This allows railto-rail signal operation. Third, when a signal V NO_
exceeds the supply rails (i.e., a fault condition), the
voltage on COM_ is limited to the supply rails.
Operation is identical for both fault polarities.
_______________________________________________________________________________________
9
MAX4508/MAX4509
Pin Descriptions
MAX4508/MAX4509
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
NORMALLY OPEN SWITCH CONSTRUCTION
V+
P2
HIGH
FAULT
P1
NO_
COM_
N1
LOW
FAULT
ON
A-
MAX4508
MAX4509
GWD
N2
VESO CODE
Figure 1. Functional Diagram
When the NO_ voltage goes beyond supply rails (fault
condition), the NO_ input becomes high impedance
regardless of the switch state or load resistance. When
power is removed, and the fault protection is still in
effect, the NO_ terminals are a virtual open circuit. The
fault can be up to ±40V, with V+ = V- = 0. If the switch
is on, the COM_ output current is furnished from the V+
or V- pin by “booster” FETs connected to each supply
pin. These FETs can source or sink up to 10mA.
The COM_ pins are not fault protected. If a voltage
source is connected to any COM_ pin, it should be limited to the supply voltages. Exceeding the supply voltage will cause high currents to flow through the ESD
protection diodes, damaging the device (see Absolute
Maximum Ratings).
Figure 1 shows the internal construction, with the analog signal paths shown in bold. A single normally open
(NO) switch is shown. The analog switch is formed by
the parallel combination of N-channel FET N1 and Pchannel FET P1, which are driven on and off simultaneously, according to the input fault condition and the
logic level state.
10
NO_ Input Voltage
The maximum allowable input voltage for safe operation depends on whether supplies are on or off and the
load configuration at the COM output. If COM is referred to a voltage other than ground, but within the
supplies, VNO_ may range higher or lower than the supplies provided the absolute value of ⎢VNO_ - VCOM_⎢ is
less than 40V. For example, if the load is referred to
+10V at COM_, then the NO_ voltage range can be
from +50V to -30V. As another example, if the load is
connected to -10V at COM_, the NO_ voltage range is
limited to -50V to +30V.
If the supplies are ±15V and COM is referenced to
ground through a load, the maximum NO_ voltage is
±25V. If the supplies are off and the COM output is referenced to ground, the maximum NO_ voltage is ±40V.
Normal Operation
Two comparators continuously compare the voltage on
the NO_ pin with V+ and V- supply voltages. When the
signal on NO_ is between V+ and V-, the multiplexer
behaves normally, with FETs N1 and P1 turning on and
off in response to A_ signals (Figure 1). The parallel
______________________________________________________________________________________
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
Positive Fault Condition
When the signal on NO_ exceeds V+ by about 150mV,
the positive fault comparator output goes high, turning
off FETs N1 and P1 (Figure 1). This makes the NO_ pin
high impedance, regardless of the switch state. If the
switch state is “off,” all FETs turn off, and both NO_ and
COM_ are high impedance. If the switch state is “on,”
FET P2 turns on, clamping COM_ to V+.
nected between GND, COM_, A_, and both V+ and V-.
If a signal on GND, COM_, or A_ exceeds V+ or V- by
more than 300mV, one of these diodes will conduct.
During normal operation, these reverse-biased ESD
diodes leak a few nanoamps of current to V+ and V-
Fault Protection Voltage and Power Off
The maximum fault voltage on the NO_ pins is ±40V
from ground when the power is off. With ±15V supply
voltages, the highest voltage on NO_ can be V- + 40V,
and the lowest voltage on NO can be V+ - 40V.
Exceeding these limits can damage the chip.
Negative Fault Condition
Logic Level Thresholds
When the signal on NO_ goes about 150mV below V-,
the negative fault comparator output goes high, turning
off FETs N1 and P1 (Figure 1). This makes the NO_ pin
high impedance, regardless of the switch state. If the
switch state is “off,” all FETs turn off, and both NO_ and
COM_ are high impedance. If the switch state is “on,”
FET N2 turns on, clamping COM_ to V-.
The logic level thresholds are CMOS and TTL compatible with V+ = 13.5V to V+ = 16.5V.
Transient Fault Condition
When a fast rising or falling transient on NO_ exceeds
V+ or V-, the output (COM_) follows the input (NO_) to
the supply rail with only a few nanoseconds delay. This
delay is due to the switch on-resistance and circuit
capacitance to ground. When the input transient
returns to within the supply rails, however, there is a
longer output recovery time. For positive faults, the
recovery time is typically 2.5µs (see Typical Operating
Characteristics). For negative faults, the recovery time
is typically 1.3µs. These values depend on the COM_
output resistance and capacitance. The delays do not
depend on the fault amplitude. Higher COM_ output
resistance and capacitance increase the recovery
times.
COM and A_
FETs N2 and P2 can source about ±10mA from V+ or
V- to the COM_ pin in the fault condition (Figure 1).
Ensure that if the COM_ pin is connected to a lowimpedance load, the absolute maximum current rating
of 30mA is never exceeded, either in normal or fault
conditions.
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.
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 gates of the multiplexers.
This drive signal is the only connection between the
power supplies and the analog signals. GND, A_, 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
+15V or -15V to +15V, the current consumption will be
reduced from 370µA (typ) to 200µA.
Power Supplies
The MAX4508/MAX4509 operate with bipolar supplies
between ±4.5V and ±20V. The V+ and V- supplies
need not be symmetrical, but their sum cannot exceed
the 44V absolute maximum rating.
The MAX4508/MAX4509 operate from single supplies
between +9V and +36V when V- is connected to GND.
The GND, COM_, and A_ pins do not have fault protection. Reverse ESD protection diodes are internally con-
______________________________________________________________________________________
11
MAX4508/MAX4509
combination of N1 and P1 forms a low-value resistor
between NO_ and COM_ so that signals pass equally
well in either direction.
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
MAX4508/MAX4509
Test Circuits/Timing Diagrams
+15V
V+
NO1
A2
A1
+10V
NO2–NO7
A0
MAX4508
+2.4V
NO8
EN
-10V
COM
GND
VOUT
V-
35pF
50Ω
LOGIC
INPUT
VA_
50%
0V
1k
-15V
VNO1
+15V
SWITCH
OUTPUT
VOUT
V+
NO1B
A1
+10V
90%
0V
90%
A0
VNO8
NO1A–NO4A
+2.4V
tR < 20ns
tF < 20ns
+3V
NO4B
MAX4509
EN
-10V
GND
50Ω
tTRANS
tTRANS
COMB
V-
ON
VOUT
35pF
300Ω
-15V
Figure 2. Address Transition Time
+15V
VEN
V+
EN
NO1
+10V
NO2–NO8
A0
A1
MAX4508
A2
COM
GND
50Ω
VOUT
V-
35pF
1k
LOGIC
INPUT
VEN
-15V
VEN
V+
EN
A1
50Ω
0V
tON(EN)
NO1B
tOFF(EN)
90%
SWITCH
OUTPUT
VOUT
+10V
NO1A–NO4A
NO2B–NO4B,
COMA
A0
50%
0V
+15V
tR < 20ns
tF < 20ns
+3V
10%
MAX4509
GND
COMB
V-
VOUT
1k
35pF
-15V
Figure 3. Enable Switching Time
12
______________________________________________________________________________________
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
+15V
+2.4V
VEN
V+
EN
NO1–NO8
A0
LOGIC
INPUT
VA
+10V
MAX4508
50%
0V
+5V
A1
VA
tR < 20ns
tF < 20ns
+3V
80%
A2
COM
GND
SWITCH
OUTPUT
VOUT
VOUT
V-
35pF
tOPEN
0V
1k
50Ω
-15V
Figure 4. MAX4508 Break-Before-Make Interval
+15V
RS
V+
NO
VEN
LOGIC
INPUT
VEN
EN
VS
A0
CHANNEL
SELECT
MAX4508
COM
+3V
OFF
ON
OFF
0V
VOUT
A1
A2
GND
CL
1000nF
V-
ΔVOUT
VOUT
ΔVOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER
ERROR VCTE WHEN THE CHANNEL TURNS OFF.
-15V
VCTE = ΔVOUT CL
Figure 5. Charge Injection
+15V
VIN
RS = 50Ω
NO1
+15V
10nF
NO1
V+
NO8
R
1kΩ
MAX4508
COM
A0
A1
A2
GND EN
V-
VIN
RG = 50Ω
RL
75Ω
NO8
MAX4508
COM
A1
A2
GND EN
V-
VOUT
RL
75Ω
10nF
10nF
-15V
-15V
OFF-ISOLATION = 20log
Figure 6. Off-Isolation
V+
NO2
A0
VOUT
10nF
VOUT
CROSSTALK = 20log
VIN
VOUT
VIN
Figure 7. Crosstalk
______________________________________________________________________________________
13
MAX4508/MAX4509
Test Circuits/Timing Diagrams (continued)
MAX4508/MAX4509
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
Test Circuits/Timing Diagrams (continued)
+15V
CHANNEL
SELECT
A1
VNO_
V+
A2
A0
EN
VCOM_
+15V
1MHz
CAPACITANCE
ANALYZER
NO8
MAX4508
GND
+25V
NO1
V-
-15V
COM
f = 1MHz
-25V
-15V
Figure 9. Transient Behavior of Fault Condition
Figure 8. NO_, COM_ Capacitance
Functional Diagrams/Truth Tables
MAX4508
V+
V-
GND
MAX4508
NO1
A2
A1
A0
EN
ON SWITCH
NO2
NO3
X
X
X
0
NONE
NO4
0
0
0
1
1
0
0
1
1
2
0
1
0
1
3
0
1
1
1
4
1
0
0
1
5
1
0
1
1
6
1
1
0
1
7
1
1
1
1
8
COM
NO5
NO6
NO7
NO8
DECODERS/DRIVERS
A0
MAX4509
A1
V+
A2
V-
EN
LOGIC "0" VAL ≤ +0.8V, LOGIC "1" VAH ≥ +2.4V
GND
NO1A
NO2A
NO3A
MAX4509
COMA
NO4A
NO1B
COMB
NO2B
NO3B
NO4B
A1
A0
EN
ON SWITCH
X
X
0
NONE
0
0
1
1
0
1
1
2
1
0
1
3
1
1
1
4
DECODERS/DRIVERS
LOGIC "0" VAL ≤ +0.8V, LOGIC "1" VAH ≥ +2.4V
A0
14
A1
EN
______________________________________________________________________________________
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
PART
TEMP
RANGE
MAX4509CSE+
MAX4509CPE+
MAX4509C/D
PINPACKAGE
PKG
CODE
0°C to +70°C
16 Narrow SO
S16-8
0°C to +70°C
16 Plastic DIP
P16-4
0°C to +70°C
Dice*
EN
A0
A1 A2
V-
GND
V+
—
MAX4509ESE+
-40°C to +85°C 16 Narrow SO
S16-8
MAX4509EPE+
-40°C to +85°C 16 Plastic DIP
P16-4
MAX4509MJE
-40°C to +85°C 16 CERDIP**
J16-3
N05
N01
*Contact factory for dice specifications.
**Contact factory for availability.
+Denotes a lead-free package.
0.198"
(5.03mm)
N02
N06
N03
N.C.
N04
N08 N07
COM
0.086"
(2.18mm)
SUBSTRATE IS INTERNALLY CONNECTED TO V+
_______________________________________________________________________________________
15
MAX4508/MAX4509
Chip Topography
Ordering Information (continued)
Package Information
DIM
A
A1
B
C
e
E
H
L
N
E
H
INCHES
MILLIMETERS
MAX
MIN
0.053
0.069
0.004
0.010
0.014
0.019
0.007
0.010
0.050 BSC
0.150
0.157
0.228
0.244
0.016
0.050
MAX
MIN
1.75
1.35
0.25
0.10
0.49
0.35
0.19
0.25
1.27 BSC
3.80
4.00
5.80
6.20
0.40
SOICN .EPS
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
1.27
VARIATIONS:
1
INCHES
TOP VIEW
DIM
D
D
D
MIN
0.189
0.337
0.386
MAX
0.197
0.344
0.394
MILLIMETERS
MIN
4.80
8.55
9.80
MAX
5.00
8.75
10.00
N MS012
8
AA
14
AB
16
AC
D
A
B
e
C
0∞-8∞
A1
L
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL
DOCUMENT CONTROL NO.
21-0041
REV.
B
1
1
PDIPN.EPS
MAX4508/MAX4509
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
16
______________________________________________________________________________________
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
CDIPS.EPS
______________________________________________________________________________________
17
MAX4508/MAX4509
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
MAX4508/MAX4509
Fault-Protected, High-Voltage Single 8-to-1/
Dual 4-to-1 Multiplexers with Output Clamps
Revision History
REVISION
NUMBER
REVISION
DATE
5
10/07
DESCRIPTION
EC table changes and stylistic corrections
PAGES
CHANGED
2–5
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.
18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.