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19-1414; Rev 5; 10/07
Fault-Protected, High-Voltage Single 8-to-1/ Dual 4-to-1 Multiplexers with Output Clamps
General Description
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 400 max and is matched between channels to 15 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 1k Output Clamp Resistance During Overvoltage 400 max On-Resistance 20ns Fault-Response Time 4.5V to 20V Dual Supplies +9V to +36V Single Supply TTL/CMOS-Compatible Logic Inputs
MAX4508/MAX4509
Applications
Data-Acquisition Systems Industrial and Process Control Avionics Signal Routing Redundant/Backup Systems
PART MAX4508CSE+ MAX4508CPE+ MAX4508C/D MAX4508ESE+ MAX4508EPE+ MAX4508MJE
Ordering Information
TEMP RANGE 0C to +70C 0C to +70C 0C to +70C PINPACKAGE 16 Narrow SO 16 Plastic DIP Dice* PKG CODE S16-8 P16-4 -- S16-8 P16-4 J16-3
-40C to +85C 16 Narrow SO -40C to +85C 16 Plastic DIP -40C to +85C 16 CERDIP**
Functional Diagrams/Truth Tables appear at end of data sheet.
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 NO1 4 NO2 5 NO3 6 NO4 7 COM 8 LOGIC 16 A1 15 A2 14 GND 13 V+ 12 NO5 11 NO6 10 NO7 9 NO8 A0 1 EN 2 V- 3 NO1A 4 NO2A 5 NO3A 6 NO4A 7 COMA 8 LOGIC
MAX4509
16 A1 15 GND 14 V+ 13 NO1B 12 NO2B 11 NO3B 10 NO4B 9 COMB
SO/DIP
SO/DIP
________________________________________________________________ Maxim Integrated Products
1
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Fault-Protected, High-Voltage Single 8-to-1/ Dual 4-to-1 Multiplexers with Output Clamps MAX4508/MAX4509
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 = +70C) 16 Narrow SO (derate 8.70mW/C above +70C) ........696mW 16-Pin PDIP (derate 10.53mW/C above +70C)..........842mW 16-Pin CERDIP (derate 10.00mW/C above +70C).....800mW Operating Temperature Ranges MAX4508C_ E/MAX4509C_E...............................0C to +70C MAX4508E_ E/MAX4509E_E ............................-40C to +85C MAX4508MJE/MAX4509MJE..........................-55C to +125C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10s) .................................+300C
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 = +25C.) (Note 2) PARAMETER ANALOG SWITCH Fault-Free Analog Signal Range (Notes 3, 4) On-Resistance VNO_ V+ = +15V, V- = -15V, VNO_= 15V VCOM_ = 10V, INO_ = 0.2mA C, E, M +25C RON C, E M +25C On-Resistance Match Between Channels (Note 5) RON VCOM_ = 10V, INO_ = 0.2mA C, E M +25C NO_ Off-Leakage Current (Note 6) INO_(OFF) - VNO_ = 10V, VCOM_ = +10V C, E M +25C MAX4508 COM_ Off-Leakage Current (Note 6) ICOM_(OFF) VCOM_ = 10V, - VNO_ = +10V MAX4509 C, E M +25C C, E M +25C MAX4508 COM_ On-Leakage Current (Note 6) ICOM_(ON) VCOM_ = 10V, VNO_ = 10V or floating MAX4509 C, E M +25C C, E M 2 V300 V+ 400 500 700 15 20 25 V SYMBOL CONDITIONS TA MIN TYP MAX UNITS
-0.5
-5 -50 -2 -20 -200 -1 -100 -100 -2 -100 -300 -1 -15 -150
+0.5 +5 +50 +2 +75 +200 +1 +75 +100 +2 +75 +300 +1 +75 +150 nA nA nA
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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 = +25C.) (Note 2) PARAMETER FAULT PROTECTION Fault-Protected Analog Signal Range (Notes 3, 4) COM_ Output Leakage Current, Supplies On VNO_ Applies with power on, Figure 9 Applies with power off VNO_= 25V, VEN = 0 +25C +25C ICOM_ C, E M NO_ Input Leakage Current, Supplies On INO_ - VNO_= 25V, VCOM_ = +10V, VEN = 0 +25C C, E M +25C NO_ Input Leakage Current, Supplies Off COM_ On Clamp Output Current, Supplies On COM_ On Clamp Output Resistance, Supplies On Fault Output Clamp Turn-On Delay (Note 4) Fault Recovery Time (Note 4) LOGIC INPUT A_ Input Logic Threshold High A_ Input Logic Threshold Low A_ Input Current Logic High or Low VA_H VA_L IA_H, IA_L VA_= 0.8V or 2.4V C, E, M C, E, M C, E, M -1 2.4 0.8 +1 V V A INO_ VNO_= 40V, VCOM = 0, V+ = 0, V- = 0 VCOM = 0 VNO_ = 25V RL = 10k, VNO_ = 25V RL = 10k, VNO_ = 25V VNO_ = +25V VNO_ = -25V C, E M ICOM_ RCOM_ +25C +25C +25C +25C -25 -40 -20 -1 -100 -20 -200 -50 -20 -5 -100 7 -13 100 10 -11 1.0 20 2.5 +25 +40 +20 +1 +100 +20 +200 +50 +20 +5 +100 13 -7 2.5 V nA A nA A nA A mA k ns s SYMBOL CONDITIONS TA MIN TYP MAX UNITS
MAX4508/MAX4509
SWITCH DYNAMIC CHARACTERISTICS +25C Enable Turn-On Time tON VNO_ = 10V, RL = 1k, Figures 2 and 3 Figure 2 VNO_ = 10V, RL = 1k, Figures 2 and 3 VNO_ = 10V, RL = 1k, Figure 4 CL = 1.0nF, VNO_ = 0, RS = 0, Figure 5 RL = 75, CL = 15pF, VNO_ = 1VRMS, f = 1MHz, Figure 6 C, E M Transition Time tTRANS +25C C, E, M +25C Enable Turn-Off Time Break-Before-Make Time Delay (Note 4) Charge Injection (Note 4) Off-Isolation (Note 7) tOFF C, E M tBBM Q VISO C, E, M +25C +25C 10 80 2 -70 10 120 170 160 275 400 600 350 500 200 250 400 ns pC dB ns ns ns
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Fault-Protected, High-Voltage Single 8-to-1/ Dual 4-to-1 Multiplexers with Output Clamps MAX4508/MAX4509
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 = +25C.) (Note 2) PARAMETER Channel-to-Channel Crosstalk (Note 8) NO_ Off-Capacitance COM_ Off-Capacitance COM_ On-Capacitance POWER SUPPLY Power-Supply Range V+ Supply Current V+, VI+ All VA_ = 0 or 5V, VNO_ = 0, VEN = 5V C, E, M +25C C, E M +25C V- Supply Current IAll VA_ = 0 or 5V, VNO_ = 0, VEN = 5V All VA_ = 0 or 5V, VNO_ = 0, VEN = 5V C, E M +25C C, E, M 200 200 4.5 370 20 500 750 850 300 400 500 300 500 A A A V SYMBOL VCT CN_(OFF) CONDITIONS RL = 75, CL = 15pF, VNO_ = 1VRMS, f = 1MHz, Figure 7 f = 1MHz, Figure 8 MAX4508 MAX4509 MAX4508 MAX4509 TA +25C +25C +25C +25C MIN TYP -62 10 19 14 28 22 MAX UNITS dB pF pF pF
CCOM_(OFF) f = 1MHz, Figure 8 CCOM_(ON) f = 1MHz, Figure 8
GND Supply Current
IGND
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 = +25C.) (Note 2) PARAMETER ANALOG SWITCH Fault-Free Analog Signal Range (Note 3) On-Resistance VNO_ V+ = 12V, V- = 0, VNO_ = 12V C, E, M +25C RON VCOM_ = +10V, INO_ = 200A C, E M +25C On-Resistance Match Between Channels (Note 5) RON VCOM_ = 10V, INO_ = 200A C, E M +25C NO_ Off-Leakage Current (Notes 6, 9) INO_(OFF) VCOM_ = 10V, 1V; VNO_ = 1V, 10V C, E M 10 0 650 V+ 950 1100 1300 35 50 75 V SYMBOL CONDITIONS TA MIN TYP MAX UNITS
-0.5
-10 -200
0.01
+0.5 +10 +200 nA
4
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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 = +25C.) (Note 2) PARAMETER SYMBOL CONDITIONS MAX4508 COM_ Off-Leakage Current (Note 6) VCOM_ = 10V, 1V; ICOM_(OFF) VNO_ = 1V, 10V MAX4509 TA +25C C, E M +25C C, E M +25C MAX4508 COM_ On-Leakage Current (Note 6) ICOM_(ON) VCOM_ = 10V, 1V; VNO_ = 10V, 1V, or floating MAX4509 FAULT PROTECTION Fault-Protected Analog Signal Range (Notes 3, 10) COM_ Output Leakage Current, Supply On (Notes 3, 10) VNO_ Applies with all power on Applies with all power off VNO_ = 25V, V+ = 12V +25C +25C ICOM_ C, E M +25C NO_ Input Leakage Current, Supply On (Notes 3, 10) INO_ VNO_ = 25V, VCOM_ = 0, V+ = 12V C, E M +25C NO_ Input Leakage Current, Supply Off (Notes 3, 10) COM_ ON Output Current, Supply On COM_ ON Output Resistance, Supply On LOGIC INPUT A_ Input Logic Threshold High A_ Input Logic Threshold Low A_ Input Current Logic High or Low VIN_H VIN_L IINH_, IINL_ VIN_= 0.8V or 2.4V C, E, M C, E, M C, E, M 0.8 -1 1.8 1.8 0.03 +1 2.4 V V A INO_ VNO_= 40V, V+ = 0, V- = 0 C, E M ICOM_ RCOM_ VNO_ = 25V, V+ = 12V VNO_ = 25V, V+ = 12V +25C +25C -25 -40 -20 -1 -100 -20 -5 -100 -20 -5 -100 2 3 2.4 0.1 +25 +40 +20 +1 +100 +20 +5 +100 +20 +5 +100 5 6 V nA A nA A nA A A mA k C, E M +25C C, E M MIN -2 -20 -200 -1 -10 -100 -2 -100 -300 -1 -15 -150 TYP MAX +2 +75 +200 +1 +75 +100 +2 +75 +300 +1 +75 +150 nA nA UNITS
MAX4508/MAX4509
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Fault-Protected, High-Voltage Single 8-to-1/ Dual 4-to-1 Multiplexers with Output Clamps MAX4508/MAX4509
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 = +25C.) (Note 2) PARAMETER SYMBOL CONDITIONS VCOM_ = 10V, RL = 2k, Figure 3 VCOM_ = 10V, RL = 2k, Figure 3 VCOM_ = 10V, RL = 2k, Figure 4 CL = 1.0nF, VNO_ = 0, RS = 0, Figure 5 TA +25C C, E, M +25C C, E, M +25C +25C +25C +25C +25C +25C +25C 50 100 2 10 19 28 -70 -62 10 100 MIN TYP 220 MAX 500 700 250 350 UNITS
SWITCH DYNAMIC CHARACTERISTICS Enable Turn-On Time Enable Turn-Off Time Break-Before-Make Time Delay (Note 4) Charge Injection (Note 4) NO_ Off-Capacitance COM_ Off-Capacitance COM_ On-Capacitance Off-Isolation (Note 7) Channel-to-Channel Crosstalk (Note 8) POWER SUPPLY Power-Supply Range V+ All VA_ = 0 or 5V, VNO_ = 0, VEN = 5V All VA_ = 0 or V+, VNO_ = 0, VEN = 0 or V+ Note 2: Note 3: C, E, M +25C C, E, M +25C C, E, M 100 9 200 36 300 675 250 375 A V tON tOFF tBBM Q ns ns ns pC pF pF pF dB dB
CNO_(OFF) VNO_ = 0, f = 1MHz, Figure 8 CCOM_(OFF) VCOM_ = 0, f = 1MHz, Figure 8 CCOM_(ON) VISO VCT VCOM_ = VNO_ = 0, f = 1MHz, Figure 8 RL = 75, CL = 15pF, VNO_ = 1VRMS, f = 1MHz, Figure 6 RL = 75, CL = 15pF, VNO_ = 1VRMS, f = 1MHz, Figure 7
V+ Supply Current
I+
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: RON = RON(MAX) - RON(MIN). Note 6: Leakage parameters are 100% tested at the maximum rated hot temperature and guaranteed by correlation at TA = +25C. 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.
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Fault-Protected, High-Voltage Single 8-to-1/ Dual 4-to-1 Multiplexers with Output Clamps MAX4508/MAX4509
Typical Operating Characteristics
(V+ = +15V, V- = -15V, VEN = +2.4V, TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. VCOM (DUAL SUPPLIES)
MAX4508/09toc01
MAX4508/09toc02
900 800 700 RON () 600 500 400 300 200 100 0 -20 -15
V+ = +4.5V V- = -4.5V V+ = +10V V- = -10V V+ = +15V V- = -15V
1000 900 800 700 RON () 600 500 400 300 200 100 0
V+ = +9V
V+ = +15V V- = -15V +125C +85C
500 400 RON () 300 200
V+ = +12V V+ = +15V V+ = +20V V+ = +30V
+70C +25C -40C -55C
V+ = +20V V- = -20V -10 -5 0 VCOM (V) 5 10 15 20
V+ = +36V
100 0
0
5
10
15
20 VCOM (V)
25
30
35
40
-15
-10
-5
0 VCOM (V)
5
10
15
ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY)
MAX4508/09toc04
LEAKAGE CURRENT vs. TEMPERATURE
MAX4508/09toc05
CHARGE INJECTION vs. VCOM
V+ = +15V V- = -15V 2.0 DUAL SUPPLIES
MAX4508/09toc06
1000 900 800 700 RON () 600 500 400 300 200 100 0 0
V+ = +12V V- = 0
1 100n 10n LEAKAGE (A) 1n V+ = +15V V- = -15V VCOM = 10V VNO = 10V ICOM_OFF ICOM_ON
2.5
+125C +85C +70C +25C -40C -55C
100p 10p 1p 0.1p
Q (pC)
1.5
1.0 INO_OFF
0.5 SINGLE SUPPLY -15 -10 -5 0 VCOM (V) 5 10 15
0 -55 -30 -5 20 45 70 95 120 145 TEMPERATURE (C)
2
4
6 8 VCOM (V)
10
12
14
ENABLE ON AND OFF TIMES vs. SUPPLY VOLTAGE (DUAL SUPPLIES)
MAX4508/09toc07
ENABLE ON AND OFF TIMES vs. SUPPLY VOLTAGE (SINGLE SUPPLY)
MAX4508/09toc08
ENABLE ON AND OFF TIMES vs. TEMPERATURE
V+ = +15V V- = -15V
MAX4508/09toc09
800 700 600 tON, tOFF (ns) 500 400 300 200 100 0 0 tOFF tON
VNO_ = 10V
350 300 250 tON, tOFF (ns)
VNO_ = +10V
300 250 200 tON, tOFF (ns)
200 150 tOFF 100 50 0
tON
tON 150 100 50 0 tOFF
2 4 6 8 10 12 14 16 18 20 SUPPLY VOLTAGE (V)
0
5
10
15
20
25
30
35
-55
-25
5
35
65
95
125
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
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MAX4508/09toc03
1000
ON-RESISTANCE vs. VCOM (SINGLE SUPPLY)
1100 600
ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES)
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Fault-Protected, High-Voltage Single 8-to-1/ Dual 4-to-1 Multiplexers with Output Clamps MAX4508/MAX4509
Typical Operating Characteristics (continued)
(V+ = +15V, V- = -15V, VEN = +2.4V, TA = +25C, unless otherwise noted.)
POWER-SUPPLY CURRENT vs. TEMPERATURE (VA = 0)
MAX4508/09toc10
POWER-SUPPLY CURRENT vs. TEMPERATURE (VA = +5V)
SUPPLY CURRENT I+, I-, IGND (A) I+ V+ = +15V V- = -15V VA = +5V
MAX4508/09toc11 MAX4508/09toc16 MAX4508/09taoc13
300 I+ 200 I+, I-, IGND (A) 100 IGND 0 V+ = +15V V- = -15V VA = 0
600 400 200 IGND 0 -200 -400 -600
-100 -200 -300 -55 -30 -5 20 45 70 95 120 145 TEMPERATURE (C) I-
I-
-60 -40 -20 0
20 40 60 80 100 120 140
TEMPERATURE (C)
LOGIC-LEVEL THRESHOLD vs. SUPPLY VOLTAGE
MAX4508/09toc12
FREQUENCY RESPONSE
20 0 -20 LOSS (dB) -40 CROSSTALK -60 -80 -100 OFF-ISOLATION V+ = +15V V- = -15V BANDWIDTH
3.0 2.5 2.0 1.5 1.0 0.5 0 0
V- = GND
LOGIC-LEVEL THRESHOLD (V)
DUAL SUPPLIES SINGLE SUPPLY
5
10
15
20
25
30
35
40
0.001
0.01
0.1
1
10
100
1000
SUPPLY VOLTAGE (V)
FREQUENCY (MHz)
FAULT-FREE SIGNAL PERFORMANCE
MAX4508/09toc14
INPUT OVERVOLTAGE vs. OUTPUT CLAMPING
+25V IN_ 0V +15V -25V 0V COM_ -15V
+15V IN_ 0V 10V/div -15V +15V COM_ 0V 10V/div -15V 5s/div FAULT-FREE RAIL-TO-RAIL SIGNAL HANDLING WITH 15V SUPPLIES
0V
5s/div 25V OVERVOLTAGE INPUT WITH THE OUTPUT CLAMPED AT 15V
8
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Fault-Protected, High-Voltage Single 8-to-1/ Dual 4-to-1 Multiplexers with Output Clamps MAX4508/MAX4509
Pin Descriptions
MAX4508 (Single 8-to-1 Mux)
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 NAME A0 EN VNO1 NO2 NO3 NO4 COM NO8 NO7 NO6 NO5 V+ GND A2 A1 Mux Enable Negative Supply Voltage Channel Input 1 Channel Input 2 Channel Input 3 Channel Input 4 Analog Output Channel Input 8 Channel Input 7 Channel Input 6 Channel Input 5 Positive Supply Voltage Ground Address Bit 2 Address Bit 1 FUNCTION Address Bit 0
MAX4509 (Dual 4-to-1 Mux)
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 NAME A0 EN VNO1A NO2A NO3A NO4A COMA COMB NO4B NO3B NO2B NO1B V+ GND A1 Mux Enable Negative Supply Voltage Channel Input 1A Channel Input 2A Channel Input 3A Channel Input 4A Mux Output A Mux Output B Channel Input 4B Channel Input 3B Channel Input 2B Channel Input 1B Positive Supply Voltage Ground Address Bit 1 FUNCTION Address Bit 0
Truth Tables MAX4508 (Single 8-to-1 Mux)
A2 x 0 0 0 0 1 1 1 1 A1 x 0 0 1 1 0 0 1 1 A0 x 0 1 0 1 0 1 0 1 EN 0 1 1 1 1 1 1 1 1 ON SWITCH None NO1 NO2 NO3 NO4 NO5 NO6 NO7 NO8
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.
MAX4509 (Dual 4-to-1 Mux)
A1 x 0 0 1 1 A0 x 0 1 0 1 EN 0 1 1 1 1 COMA None NO1A NO2A NO3A NO4A COMB None NO1B NO2B NO3B NO4B
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Fault-Protected, High-Voltage Single 8-to-1/ Dual 4-to-1 Multiplexers with Output Clamps MAX4508/MAX4509
NORMALLY OPEN SWITCH CONSTRUCTION V+ P2
HIGH FAULT P1 NO_ LOW FAULT COM_
N1
A-
ON
MAX4508 MAX4509 GWD
VESO CODE
N2
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
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Fault-Protected, High-Voltage Single 8-to-1/ Dual 4-to-1 Multiplexers with Output Clamps 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. 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-
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+.
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
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-.
Logic Level Thresholds
The logic level thresholds are CMOS and TTL compatible with V+ = 13.5V to V+ = 16.5V.
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-.
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 2.5s (see Typical Operating Characteristics). For negative faults, the recovery time is typically 1.3s. 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.
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 370A (typ) to 200A.
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. The GND, COM_, and A_ pins do not have fault protection. Reverse ESD protection diodes are internally con-
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.
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11
Fault-Protected, High-Voltage Single 8-to-1/ Dual 4-to-1 Multiplexers with Output Clamps MAX4508/MAX4509
Test Circuits/Timing Diagrams
+15V V+ A2 A1 A0 NO1 NO2-NO7 +10V
MAX4508
+2.4V 50 -15V +15V V+ A1 A0 EN GND V-
NO8 COM
-10V VOUT 35pF 1k LOGIC INPUT VA_ +3V 50% 0V VNO1 SWITCH OUTPUT VOUT
tR < 20ns tF < 20ns
90%
NO1B NO1A-NO4A
+10V
0V 90% VNO8
+2.4V
MAX4509
EN GND
NO4B COMB V300
-10V VOUT 35pF
tTRANS
ON
tTRANS
50 -15V
Figure 2. Address Transition Time
+15V VEN V+ NO1 NO2-NO8 A0 A1 A2 COM 50 GND V1k -15V +15V VEN EN V+ NO1B +10V SWITCH OUTPUT VOUT 10% VOUT 35pF LOGIC INPUT VEN +3V 50% 0V tON(EN) 0V 90% +10V
EN
MAX4508
tR < 20ns tF < 20ns tOFF(EN)
A0 A1 50
NO1A-NO4A NO2B-NO4B, COMA
MAX4509
GND COMB V1k -15V VOUT 35pF
Figure 3. Enable Switching Time 12 ______________________________________________________________________________________
Fault-Protected, High-Voltage Single 8-to-1/ Dual 4-to-1 Multiplexers with Output Clamps MAX4508/MAX4509
Test Circuits/Timing Diagrams (continued)
+15V VEN V+ NO1-NO8 A0 A1 VA A2 GND 50 -15V V1k COM VOUT 35pF SWITCH OUTPUT VOUT 0V LOGIC INPUT VA +3V 50% 0V +5V 80%
+2.4V
EN
tR < 20ns tF < 20ns
+10V
MAX4508
tOPEN
Figure 4. MAX4508 Break-Before-Make Interval
+15V RS NO VEN VS CHANNEL SELECT EN A0 A1 A2 CL 1000nF VOUT VOUT VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR VCTE WHEN THE CHANNEL TURNS OFF. -15V VCTE = VOUT CL V+ LOGIC INPUT VEN COM VOUT +3V OFF 0V ON OFF
MAX4508
GND
V-
Figure 5. Charge Injection
+15V 10nF +15V 10nF
VIN RS = 50
NO1 NO8
V+ R 1k COM VOUT RL 75 RG = 50 VIN
NO1 NO2 NO8 A0 A1 A2
V+
MAX4508
A0 A1 A2 GND EN 10nF -15V OFF-ISOLATION = 20log VOUT VIN V-
MAX4508
COM
VOUT RL 75
GND EN 10nF
V-
-15V CROSSTALK = 20log
VOUT VIN
Figure 6. Off-Isolation
Figure 7. Crosstalk 13
______________________________________________________________________________________
Fault-Protected, High-Voltage Single 8-to-1/ Dual 4-to-1 Multiplexers with Output Clamps MAX4508/MAX4509
Test Circuits/Timing Diagrams (continued)
+15V A2 CHANNEL SELECT A1 A0 GND EN VV+ VNO_ NO1 NO8 COM f = 1MHz -25V 1MHz CAPACITANCE ANALYZER -15V +25V +15V VCOM_
MAX4508
-15V
Figure 8. NO_, COM_ Capacitance
Figure 9. Transient Behavior of Fault Condition
Functional Diagrams/Truth Tables
MAX4508
NO1 NO2 NO3 NO4 NO5 NO6 NO7 NO8 DECODERS/DRIVERS COM V+ VGND
MAX4508
A2 X 0 0 0 0 1 1 1 1 A0 A1 A2 EN A1 X 0 0 1 1 0 0 1 1 A0 X 0 1 0 1 0 1 0 1 EN 0 1 1 1 1 1 1 1 1 ON SWITCH NONE 1 2 3 4 5 6 7 8
LOGIC "0" VAL +0.8V, LOGIC "1" VAH +2.4V
MAX4509
NO1A NO2A NO3A NO4A NO1B NO2B NO3B NO4B
V+
V-
GND
COMA A1 X COMB 0 0 1 1 DECODERS/DRIVERS A0 X 0 1 0 1
MAX4509
EN 0 1 1 1 1 ON SWITCH NONE 1 2 3 4
LOGIC "0" VAL +0.8V, LOGIC "1" VAH +2.4V A0 A1 EN
14
______________________________________________________________________________________
Fault-Protected, High-Voltage Single 8-to-1/ Dual 4-to-1 Multiplexers with Output Clamps
Ordering Information (continued)
PART MAX4509CSE+ MAX4509CPE+ MAX4509C/D MAX4509ESE+ MAX4509EPE+ MAX4509MJE TEMP RANGE 0C to +70C 0C to +70C 0C to +70C PINPACKAGE 16 Narrow SO 16 Plastic DIP Dice* PKG CODE S16-8 P16-4 -- S16-8 P16-4 J16-3
N01 N05 0.198" (5.03mm) N02 N06 V+ EN VA0
Chip Topography
A1 A2 GND
MAX4508/MAX4509
-40C to +85C 16 Narrow SO -40C to +85C 16 Plastic DIP -40C to +85C 16 CERDIP**
*Contact factory for dice specifications. **Contact factory for availability. +Denotes a lead-free package.
N03 N04 N08 N07 COM 0.086" (2.18mm)
N.C.
SUBSTRATE IS INTERNALLY CONNECTED TO V+
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15
Fault-Protected, High-Voltage Single 8-to-1/ Dual 4-to-1 Multiplexers with Output Clamps MAX4508/MAX4509
Package Information
(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.)
SOICN .EPS
INCHES DIM A A1 B C e E H L 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
MILLIMETERS 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 1.27
N
E
H
VARIATIONS:
1
INCHES
MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 N MS012 8 AA 14 AB 16 AC
TOP VIEW
DIM D D D
MIN 0.189 0.337 0.386
MAX 0.197 0.344 0.394
D A e B A1 L C
0-8
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL DOCUMENT CONTROL NO. REV.
21-0041
B
1 1
16
______________________________________________________________________________________
PDIPN.EPS
Fault-Protected, High-Voltage Single 8-to-1/ Dual 4-to-1 Multiplexers with Output Clamps
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.)
CDIPS.EPS
MAX4508/MAX4509
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17
Fault-Protected, High-Voltage Single 8-to-1/ Dual 4-to-1 Multiplexers with Output Clamps MAX4508/MAX4509
Revision History
REVISION NUMBER 5 REVISION DATE 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 (c) 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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