19-1414; Rev 0; 1/99 Fault-Protected, High-Voltage Single 8-to-1/Dual 4-to-1 Multiplexers 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 15Ωmax. 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 ♦ 400Ωmax On-Resistance ♦ 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 MAX4508CAE 0°C to +70°C Industrial and Process Control Avionics Signal Routing Redundant/Backup Systems Functional Diagrams/Truth Tables appear at end of data sheet. PIN-PACKAGE 16 SSOP MAX4508CSE 0°C to +70°C 16 Narrow SO MAX4508CPE 0°C to +70°C 16 Plastic DIP MAX4508C/D 0°C to +70°C Dice* MAX4508EAE -40°C to +85°C 16 SSOP MAX4508ESE -40°C to +85°C 16 Narrow SO MAX4508EPE -40°C to +85°C 16 Plastic DIP MAX4508MJE -55°C to +125°C 16 CERDIP** Ordering Information continued at end of data sheet. *Contact factory for dice specifications. **Contact factory for availability. 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 SSOP/SO/DIP COMB SSOP/SO/DIP 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. MAX4508/MAX4509 General Description MAX4508/MAX4509 Fault-Protected, High-Voltage Single 8-to-1/Dual 4-to-1 Multiplexers 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 SSOP (derate 8.70mW/°C above +70°C) ................667mW 16 Narrow SO (derate 8.70mW/°C above +70°C) ........471mW 16-Pin Plastic DIP (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, 10sec) .............................+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) ∆RON 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 20 M -200 200 +25°C -1 1 C, E -10 10 100 M -100 +25°C -2 2 C, E -25 25 M -300 300 +25°C -1 1 C, E -15 15 M -150 150 _______________________________________________________________________________________ Ω nA nA nA Fault-Protected, High-Voltage Single 8-to-1/Dual 4-to-1 Multiplexers (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_ COM_ Output Leakage Current, Supplies On ICOM_ NO_ Input Leakage Current, Supplies On NO_ Input Leakage Current, Supplies Off INO_ INO_ Applies with power on, Figure 9 Applies with power off VNO_= ±25V, VEN = 0 – VNO_= ±25V, VCOM_ = +10V, VEN = 0 VNO_= ±40V, VCOM = 0, V+ = 0, V- = 0 VNO_ = 25V -25 25 -40 40 +25°C -10 10 C, E -20 20 +25°C M -100 100 +25°C -20 20 C, E -200 200 V nA µA nA 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 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 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 GND Supply Current I- IGND All VA_ = 0 or 5V, VNO_ = 0, VEN = 5V 600 M 800 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 ±20 370 300 500 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 1100 M 1300 10 +25°C On-Resistance Match Between Channels (Note 5) ∆RON VCOM_ = 10V, INO_ = 200µA 4 VCOM_ = 10V, 1V; VNO_ = 1V, 10V Ω 75 M INO_(OFF) Ω 25 50 C, E +25°C NO_ Off-Leakage Current (Notes 6, 9) 950 C, E -0.5 0.01 0.5 C, E -10 10 M -200 200 _______________________________________________________________________________________ nA Fault-Protected, High-Voltage Single 8-to-1/Dual 4-to-1 Multiplexers (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) ICOM_(OFF) VCOM_ = 10V, 1V; 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 20 M -200 200 +25°C -1 1 C, E -10 10 M -100 100 +25°C -2 2 C, E -25 25 M -300 300 +25°C -1 1 nA nA C, E -15 15 M -150 150 -25 25 -40 40 +25°C -20 20 C, E -20 20 M -100 100 +25°C -20 20 C, E -5 5 M -100 100 +25°C -20 C, E -5 5 M -100 100 µA µA 2 3 5 mA 2.4 6 kΩ 1.8 2.4 V FAULT PROTECTION Fault-Protected Analog Signal Range (Notes 3, 10) VNO_ COM_ Output Leakage Current, Supply On (Notes 3, 10) ICOM_ NO_ Input Leakage Current, Supply On (Notes 3, 10) NO_ Input Leakage Current, Supply Off (Notes 3, 10) INO_ INO_ Applies with all power on Applies with all power off VNO_ = ±25V, V+ = 12V VNO_ = ±25V, VCOM_ = 0, V+ = 12V VNO_= ±40V, V+ = 0, V- = 0 +25°C 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 0.1 20 V nA µA nA µA nA 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 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 220 500 Enable Turn-On Time tON VCOM_ = 10V, RL = 2kΩ, Figure 3 Enable Turn-Off Time tOFF VCOM_ = 10V, RL = 2kΩ, Figure 3 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 CNO_(OFF) VNO_ = 0, f = 1MHz, Figure 8 +25°C 10 pF CCOM_(OFF) VCOM_ = 0, f = 1MHz, Figure 8 Charge Injection (Note 4) NO_ Off-Capacitance COM_ Off-Capacitance COM_ On-Capacitance Q CCOM_(ON) C, E, M 700 +25°C 100 C, E, M 250 350 50 100 ns ns ns 10 pC +25°C 19 pF 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- and GND Supply Current V+ I+ IGND C, E, M +25°C All VA_ = 0 or 5V, VNO_ = 0, VEN = 5V C, E, M All VA_ = 0 or 5V, VNO_ = 0, VEN = +5V C, E, M All VA_ = 0 or 5V +25°C +25°C 9 36 200 300 450 150 C, E, M µA 250 375 250 V 400 µA 600 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 refer to 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 = +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 900 RON (Ω) V+ = +15V V- = -15V +125°C 600 V+ = +20V 500 300 +70°C V+ = +30V 400 +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) 800 LEAKAGE (A) +25°C 500 V+ = +15V V- = -15V VCOM = 10V VNO = ±10V 100n 10n +70°C -40°C -10 -5 -55°C 0 5 ICOM_ON 10p 2.5 V+ = +15V V- = -15V 2.0 DUAL SUPPLIES 1.5 INO_OFF 0.5 1p 0.1p 2 4 6 8 VCOM (V) 10 12 14 -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 150 300 0 ±2 ±4 ±6 ±8 ±10 ±12 ±14 ±16 ±18 ±20 SUPPLY VOLTAGE (V) 15 V+ = +15V V- = -15V 250 tOFF tON 150 100 tOFF 100 50 0 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 0 MAX4508/09toc09 0 15 1.0 200 100 10 CHARGE INJECTION vs. VCOM ICOM_OFF 1n 100p 400 300 -15 40 VCOM (V) 1µ +85°C 600 35 LEAKAGE CURRENT vs. TEMPERATURE MAX4508/09toc04 +125°C 700 30 ± V+ = +12V V- = 0 900 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 400 MAX4508/09toc06 500 V+ = +12V V+ = +15V 700 300 RON (Ω) 500 RON (Ω) V+ = +10V V- = -10V 600 400 tON, tOFF (ns) V+ = +15V V- = -15V 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 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.) Note 2: Guaranteed by Design. Guaranteed by Design 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 -300 400 200 IGND 0 -200 -400 I- -600 -55 -30 -5 20 45 70 95 120 145 -60 -40 -20 0 TEMPERATURE (°C) FREQUENCY RESPONSE V- = GND 2.5 DUAL SUPPLIES V+ = +15V V- = -15V 0 BANDWIDTH -20 LOSS (dB) 2.0 20 MAX4508/09toc12 3.0 20 40 60 80 100 120 140 TEMPERATURE (°C) LOGIC-LEVEL THRESHOLD vs. SUPPLY VOLTAGE SINGLE SUPPLY 1.5 -40 CROSSTALK 1.0 -60 0.5 -80 OFF-ISOLATION -100 0 5 10 15 20 25 30 35 0.001 40 0.01 0.1 1 10 100 1000 FAULT-FREE SIGNAL PERFORMANCE INPUT OVERVOLTAGE vs. OUTPUT CLAMPING +15V IN_ 0V 10V/div -15V MAX4508/09toc16 SUPPLY VOLTAGE (V) FREQUENCY (MHz) MAX4508/09toc14 0 +25V IN_ 0V +15V +15V COM_ -25V 0V 0V 10V/div 0V COM_ -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 5µs/div ±25V OVERVOLTAGE INPUT WITH THE OUTPUT CLAMPED AT ±15V _______________________________________________________________________________________ Fault-Protected, High-Voltage Single 8-to-1/Dual 4-to-1 Multiplexers MAX4508 (Single 8-to-1 Mux) PIN NAME MAX4509 (Dual 4-to-1 Mux) FUNCTION PIN 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 Positive Supply Voltage Ground Address Bit 1 Truth Tables Detailed Description 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 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 NORMALLY OPEN SWITCH CONSTRUCTION V+ P2 MAX4508 MAX4509 HIGH FAULT P1 NO_ COM_ N1 LOW FAULT ON A- 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 simultane- 10 ously, according to the input fault condition and the logic level state. 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. ______________________________________________________________________________________ Fault-Protected, High-Voltage Single 8-to-1/Dual 4-to-1 Multiplexers 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+. 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-. 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. The GND, COM_, and A_ pins do not have fault protection. Reverse ESD protection diodes are internally connected 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. 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-. 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. ______________________________________________________________________________________ 11 MAX4508/MAX4509 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 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 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 +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- ∆VOUT VOUT ∆VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR VCTE WHEN THE CHANNEL TURNS OFF. -15V VCTE = ∆VOUT 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 VIN CROSSTALK = 20log 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 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 "O" 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 "O" 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 PART TEMP. RANGE MAX4509CAE 0°C to +70°C MAX4509CSE MAX4509CPE MAX4509C/D MAX4509EAE MAX4509ESE MAX4509EPE MAX4509MJE 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -55°C to +125°C ___________________Chip Topography EN PIN-PACKAGE 16 SSOP 16 Narrow SO 16 Plastic DIP Dice* 16 SSOP 16 Narrow SO 16 Plastic DIP 16 CERDIP** A0 A1 A2 V- GND V+ N05 N01 0.198" (5.03mm) *Contact factory for dice specifications. **Contact factory for availability. N02 N06 N03 N.C. N04 N08 N07 COM 0.086" (2.18mm) TRANSISTOR COUNT: 543 SUBSTRATE IS INTERNALLY CONNECTED TO V+. ______________________________________________________________________________________ 15 MAX4508/MAX4509 Ordering Information (continued) Fault-Protected, High-Voltage Single 8-to-1/Dual 4-to-1 Multiplexers SSOP.EPS MAX4508/MAX4509 Package Information 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.