9-44; Rev 5; /7 Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps General Description The AX458/AX459 are 8-to- and dual 4-to- faultprotected multiplexers that are pin compatible with the industry-standard DG58/DG59. The AX458/ AX459 operate with dual supplies of ±4.5 to ±2 or a single supply of +9 to +36. These multiplexers feature fault-protected inputs, rail-to-rail signal handling capability, and overvoltage clamping at 5m beyond the rails. Both parts offer ±4 overvoltage protection with supplies off and ±25 protection with supplies on. Onresistance is 4Ω max and is matched between channels to 5Ω max. All digital inputs have TTL logic thresholds, ensuring both TTL and COS logic compatibility when using a single +2 supply or dual ±5 supplies. Data-Acquisition Systems Industrial and Process Control Avionics Signal Routing Redundant/Backup Systems Applications Functional Diagrams/Truth Tables appear at end of data sheet. Features ±4 Fault Protection with Power Off ±25 Fault Protection with ±5 Supplies Rail-to-Rail Signal Handling No Power-Supply Sequencing Required All Channels Off with Power Off Output Clamped to Appropriate Supply oltage During Fault Condition kω Output Clamp Resistance During Overvoltage 4Ω max On-Resistance 2ns Fault-Response Time ±4.5 to ±2 Dual Supplies +9 to +36 Single Supply TTL/COS-Compatible Logic Inputs PART Ordering Information TEP RANGE PIN- PACKAGE Ordering Information continued at end of data sheet. *Contact factory for dice specifications. **Contact factory for availability. +Denotes a lead-free package. PKG CODE AX458CSE+ C to +7 C 6 Narrow SO S6-8 AX458CPE+ C to +7 C 6 Plastic DIP P6-4 AX458C/D C to +7 C Dice* AX458ESE+ -4 C to +85 C 6 Narrow SO S6-8 AX458EPE+ -4 C to +85 C 6 Plastic DIP P6-4 AX458JE -4 C to +85 C 6 CERDIP** J6-3 AX458/AX459 Pin Configurations/Functional Diagrams AX458 TOP IEW AX459 A 6 A A 6 A EN 2 5 A2 EN 2 5 GND - 3 LOGIC 4 GND - 3 LOGIC 4 NO 4 3 NOA 4 3 NOB NO2 5 2 NO5 NO2A 5 2 NO2B NO3 6 NO6 NO3A 6 NO3B NO4 7 NO7 NO4A 7 NO4B CO 8 9 NO8 COA 8 9 COB SO/DIP SO/DIP axim Integrated Products For pricing, delivery, and ordering information, please contact axim Direct at -888-629-4642, or visit axim s website at www.maxim-ic.com.
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps AX458/AX459 ABSOLUTE AXIU RATINGS (oltages Referenced to GND)...-.3 to +44. -...-44. to +.3 to -...-.3 to +44. CO_, A_ (Note )... ( +.3) to (- -.3) NO_...( - 4) to (- + 4) NO_ to CO_...-36 to +36 NO_ Overvoltage with Switch Power On....-3 to +3 NO_ Overvoltage with Switch Power Off....-4 to +4 Continuous Current into Any Terminal...±3mA Peak Current, into Any Terminal (pulsed at ms, % duty cycle)...±ma Stresses beyond those listed under Absolute aximum 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 Continuous Power Dissipation (T A = +7 C) 6 Narrow SO (derate 8.7mW/ C above +7 C)...696mW 6-Pin PDIP (derate.53mw/ C above +7 C)...842mW 6-Pin CERDIP (derate.mw/ C above +7 C)...8mW Operating Temperature Ranges AX458C_ E/AX459C_E... C to +7 C AX458E_ E/AX459E_E...-4 C to +85 C AX458JE/AX459JE...-55 C to +25 C Storage Temperature Range...-65 C to +6 C Lead Temperature (soldering, s)...+3 C Note : CO_, EN, and A_ pins are not fault protected. Signals on CO_, EN, or A_ exceeding or - are clamped by internal diodes. Limit forward diode current to maximum current rating. ( = +5, - = -5, A_H =+2.4, A_L = +.8, EN = +2.4, T A = T IN to T AX, unless otherwise noted. Typical values are at T A =.) (Note 2) PARAETER SYBOL CONDITIONS T A IN TYP AX UNITS ANALOG SWITCH Fault-Free Analog Signal Range (Notes 3, 4) On-Resistance On-Resistance atch Between Channels (Note 5) NO_ Off-Leakage Current (Note 6) CO_ Off-Leakage Current (Note 6) CO_ On-Leakage Current (Note 6) NO_ R ON ΔR ON I NO_(OFF) I CO_(OFF) I CO_(ON) = +5, - = -5, NO_ = ±5 CO_ = ±, I NO_ =.2mA CO_ = ±, I NO_ =.2mA NO_ = ±, CO_ = + CO_ = ±, NO_ = + CO_ = ±, NO_ = ± or floating AX458 AX459 AX458 AX459, - 3 4 5 Ω 7 5 2 Ω 25 -.5 +.5-5 +5-5 +5-2 +2-2 +75-2 +2 - + - +75 - + -2 +2 - +75-3 +3 - + -5 +75-5 +5 2
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps ELECTRICAL CHARACTERISTICS Dual Supplies (continued) ( = +5, - = -5, A_H = +2.4, A_L = +.8, EN = +2.4, T A = T IN to T AX, unless otherwise noted. Typical values are at T A =.) (Note 2) PARAETER SYBOL CONDITIONS TA FAULT PROTECTION Fault-Protected Analog Signal Range (Notes 3, 4) CO_ Output Leakage Current, Supplies On NO_ Input Leakage Current, Supplies On NO_ Input Leakage Current, Supplies Off CO_ On Clamp Output Resistance, Supplies On NO_ I CO_ I NO_ I NO_ R CO_ Applies with power on, Figure 9 Applies with power off NO_ = ±25, EN = NO_ = ±25, CO_ = +, EN = NO_ = ±4, CO =, =, - = NO_ = ±25 IN TYP AX -25 +25-4 +4-2 +2 - + - + -2 +2-2 +2-5 +5-2 +2-5 +5 - + CO_ On Clamp Output NO_ = +25 7 3 I Current, Supplies On CO_ CO = NO_ = -25-3 - -7. 2.5 UNITS ma kω AX458/AX459 ± 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 SWITCH DYNAIC CHARACTERISTICS 6 275 Enable Turn-On Time t NO_ = ±, R L = kω, ON 4 Figures 2 and 3 6 7 35 Transition Time t TRANS Figure 2, 5 2 2 NO_ = ±, R L = kω, Enable Turn-Off Time t OFF 25 Figures 2 and 3 4 Break-Before-ake Time Delay (Note 4) Charge Injection (Note 4) Off-Isolation (Note 7) A_H A_L I A_H, I A_L t BB Q ISO R L = kω, NO_ = ±25 R L = kω, NO_ = ±25 A_ =.8 or 2.4 NO_ = ±, R L = kω, Figure 4 C L =.nf, NO_ =, R S =, Figure 5 R L = 75Ω, C L = 5pF, NO_ = RS, f = Hz, Figure 6,,,, 2.4 2 2.5 - + 8.8 2-7 ns µs ns ns ns ns pc db 3
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps AX458/AX459 ELECTRICAL CHARACTERISTICS Dual Supplies (continued) ( = +5, - = -5, A_H = +2.4, A_L = +.8, EN = +2.4, T A = T IN to T AX, unless otherwise noted. Typical values are at T A =.) (Note 2) PARAETER SYBOL CONDITIONS T A Channel-to-Channel Crosstalk (Note 8) NO_ Off-Capacitance CO_ Off-Capacitance CO_ On-Capacitance POWER SUPPLY Supply Current GND Supply Current CT C N_(OFF) C CO_(OFF) C CO_(ON) I+ I GND R L = 75Ω, C L = 5pF, NO_ = RS, f = Hz, Figure 7 f = Hz, Figure 8 f = Hz, Figure 8 IN TYP AX Power-Supply Range, -, ±4.5 ±2 - Supply Current I- f = Hz, Figure 8 All A_ = or 5, NO_ =, EN = 5 All A_ = or 5, NO_ =, EN = 5 All A_ = or 5, NO_ =, EN = 5 AX458 AX459 AX458 AX459, -62 9 4 28 22 37 5 75 85 2 3 4 5 2 3 5 UNITS db pf pf pf ELECTRICAL CHARACTERISTICS Single +2 Supply ( = +2, - =, A_H = +2.4, A_L = +.8, EN = +2.4, T A = T IN to T AX, unless otherwise noted. Typical values are at T A =.) (Note 2) PARAETER SYBOL CONDITIONS T A IN TYP AX UNITS ANALOG SWITCH Fault-Free Analog Signal Range (Note 3) NO_ = 2, - =, NO_ = 2, 65 95 On-Resistance R ON CO_ = +, I NO_ = 2 Ω 3 35 On-Resistance atch Between Channels (Note 5) ΔR ON CO_ =, I NO_ = 2 5 Ω 75 -.5. +.5 NO_ Off-Leakage Current I CO_ =, ; (Notes 6, 9) NO_(OFF) - + NO_ =, -2 +2 4
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps ELECTRICAL CHARACTERISTICS Single +2 Supply (continued) ( = +2, - =, A_H = +2.4, A_L = +.8, EN = +2.4, T A = T IN to T AX, unless otherwise noted. Typical values are at T A =.) (Note 2) PARAETER CO_ Off-Leakage Current (Note 6) CO_ On-Leakage Current (Note 6) FAULT PROTECTION Fault-Protected Analog Signal Range (Notes 3, ) CO_ Output Leakage Current, Supply On (Notes 3, ) NO_ Input Leakage Current, Supply On (Notes 3, ) NO_ Input Leakage Current, Supply Off (Notes 3, ) CO_ ON Output Current, Supply On SYBOL I CO_(OFF) I CO_(ON) NO_ I CO_ I NO_ I NO_ I CO_ CONDITIONS CO_ =, ; NO_ =, CO_ =, ; NO_ =,, or floating AX458 AX459 AX458 AX459 T A IN TYP AX -2 +2-2 +75-2 +2 - + - +75 - + -2 +2 - +75-3 +3 - + -5 +75-5 +5 Applies with all power on -25 +25 Applies with all power off -4 +4-2 +2 NO_ = ±25, = 2 - + - + -2 +2 NO_ = ±25, CO_ =, = 2-5 +5 - + -2. +2 NO_ = ±4, =, - = -5 +5 - + NO_ = 25, = 2 2 3 5 UNITS ma AX458/AX459 CO_ ON Output Resistance, Supply On R CO_ NO_ = 25, = 2 2.4 6 kω LOGIC INPUT A_ Input Logic Threshold High A_ Input Logic Threshold Low IN_H IN_L,,.8 2.4.8.8 A_ Input Current Logic High or Low I INH_, I INL_ IN_ =.8 or 2.4, -.3 + 5
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps AX458/AX459 ELECTRICAL CHARACTERISTICS Single +2 Supply (continued) ( = +2, - =, A_H = +2.4, A_L = +.8, EN = +2.4, T A = T IN to T AX, unless otherwise noted. Typical values are at T A =.) (Note 2) PARAETER SYBOL CONDITIONS T A IN TYP AX UNITS SWITCH DYNAIC CHARACTERISTICS Enable Turn-On Time t ON CO_ =, R L = 2kΩ, 22 5 Figure 3, 7 ns Enable Turn-Off Time t OFF CO_ =, R L = 2kΩ, 25 Figure 3, 35 ns Break-Before-ake Time Delay (Note 4) Charge Injection (Note 4) NO_ Off-Capacitance C NO_(OFF) NO_ =, f = Hz, Figure 8 pf CO_ Off-Capacitance C CO_(OFF) CO_ =, f = Hz, Figure 8 9 pf CO_ On-Capacitance C CO_(ON) CO_ = NO_ =, f = Hz, Figure 8 Off-Isolation (Note 7) Channel-to-Channel Crosstalk (Note 8) POWER SUPPLY Power-Supply Range t BB ISO Supply Current I+ Q 28 R L = 75Ω, C L = 5pF, CT -62 db NO_ = RS, f = Hz, Figure 7 CO_ =, R L = 2kΩ, Figure 4 C L =.nf, NO_ =, R S =, Figure 5 R L = 75Ω, C L = 5pF, NO_ = RS, f = Hz, Figure 6 All A_ = or 5, NO_ =, EN = 5 All A_ = or, NO_ =, EN = or 5 2-7, 9 36 2 3, 675 25, 375 ns pc pf db Note 2: The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column. Note 3: NO_ pins are fault protected and CO_ pins are not fault protected. The max input voltage on NO_ pins depends on the CO_ load configuration. Generally, the max input voltage is ±36 with ±5 supplies and a load referred to ground. For more detailed information see the NO_ Input oltage section. Note 4: Guaranteed by design. Note 5: ΔR ON = R ON(AX) - R ON(IN). Note 6: Leakage parameters are % tested at the maximum rated hot temperature and guaranteed by correlation at T A =. Note 7: Off-Isolation = 2log ( CO_ / NO_ ), where CO_ = output and NO_ = 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 : Guaranteed by testing with dual supplies. 6
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps Typical Operating Characteristics ( = +5, - = -5, EN = +2.4, T A =, unless otherwise noted.) RON (Ω) 9 8 7 6 5 4 3 2 = +5 - = -5 ON-RESISTANCE vs. CO (DUAL SUPPLIES) = +4.5 - = -4.5 = + - = - = +2 - = -2-2 -5 - -5 5 5 2 CO () AX458/9toc RON (Ω) 9 8 7 6 5 4 3 2 ON-RESISTANCE vs. CO (SINGLE SUPPLY) = +9 = +2 = +5 = +2 = +3 = +36 5 5 2 25 3 35 4 CO () AX458/9toc2 RON (Ω) 6 5 4 3 2 ON-RESISTANCE vs. CO AND TEPERATURE (DUAL SUPPLIES) = +5 - = -5-4 C +25 C +7 C +85 C -55 C -5 - -5 5 5 CO () AX458/9toc3 AX458/AX459 RON (Ω) 9 8 7 6 5 4 3 2 ON-RESISTANCE vs. CO AND TEPERATURE (SINGLE SUPPLY) = +2 - = +25 C -55 C +85 C +7 C -4 C 2 4 6 8 2 4 CO () AX458/9toc4 LEAKAGE (A) μ n n n p p p.p LEAKAGE CURRENT vs. TEPERATURE = +5 - = -5 CO = NO = ± ± I CO_ON I CO_OFF I NO_OFF -55-3 -5 2 45 7 95 2 45 TEPERATURE ( C) AX458/9toc5 Q (pc) 2.5 2..5..5 CHARGE INJECTION vs. CO = +5 - = -5 DUAL SUPPLIES -5 - -5 5 5 CO () SINGLE SUPPLY AX458/9toc6 ton, toff (ns) 8 7 6 5 4 3 2 ENABLE ON AND OFF TIES vs. SUPPLY OLTAGE (DUAL SUPPLIES) t OFF t ON NO_ = ± AX458/9toc7 ton, toff (ns) 35 3 25 2 5 5 ENABLE ON AND OFF TIES vs. SUPPLY OLTAGE (SINGLE SUPPLY) t OFF t ON NO_ = + AX458/9toc8 ton, toff (ns) 3 25 2 5 5 ENABLE ON AND OFF TIES vs. TEPERATURE = +5 - = -5 t ON t OFF AX458/9toc9 ±2 ±4 ±6 ±8 ± ±2 ±4 ±6 ±8 ±2 SUPPLY OLTAGE () 5 5 2 25 3 35 SUPPLY OLTAGE () -55-25 5 35 65 95 25 TEPERATURE ( C) 7
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps AX458/AX459 ( = +5, - = -5, EN = +2.4, T A =, unless otherwise noted.) I+, I-, IGND (μa) LOGIC-LEEL THRESHOLD () 3 2 - -2-3 3. 2.5 2..5..5 POWER-SUPPLY CURRENT vs. TEPERATURE ( A = ) I+ I GND I- = +5 - = -5 A = -55-3 -5 2 45 7 95 2 45 TEPERATURE ( C) - = GND LOGIC-LEEL THRESHOLD vs. SUPPLY OLTAGE DUAL SUPPLIES SINGLE SUPPLY Typical Operating Characteristics (continued) AX458/9toc AX458/9toc2 SUPPLY CURRENT I+, I-, IGND (μa) LOSS (db) 6 4 2-2 -4-6 2-2 -4-6 -8 POWER-SUPPLY CURRENT vs. TEPERATURE ( A = +5) I+ I GND I- = +5 - = -5 A = +5-6 -4-2 2 4 6 8 2 4 TEPERATURE ( C) = +5 - = -5 FREQUENCY RESPONSE BANDWIDTH CROSSTALK OFF-ISOLATION AX458/9toc AX458/9taoc3 5 5 2 25 3 35 4 SUPPLY OLTAGE () FAULT-FREE SIGNAL PERFORANCE -... FREQUENCY (Hz) INPUT OEROLTAGE vs. OUTPUT CLAPING +5 IN_ /div -5 AX458/9toc4 +25 IN_ AX458/9toc6 +5 +5 CO_ /div -5-25 CO_ -5 5μs/div FAULT-FREE RAIL-TO-RAIL SIGNAL HANDLING WITH ±5 SUPPLIES 5μs/div ±25 OEROLTAGE INPUT WITH THE OUTPUT CLAPED AT ±5 8
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps AX458 (Single 8-to- ux) PIN NAE FUNCTION A Address Bit 2 EN ux Enable 3 - Negative Supply oltage 4 NO Channel Input 5 NO2 Channel Input 2 6 NO3 Channel Input 3 7 NO4 Channel Input 4 8 CO Analog Output 9 NO8 Channel Input 8 NO7 Channel Input 7 NO6 Channel Input 6 2 NO5 Channel Input 5 3 Positive Supply oltage 4 GND Ground 5 A2 Address Bit 2 6 A Address Bit Pin Descriptions AX459 (Dual 4-to- ux) PIN NAE FUNCTION A Address Bit 2 EN ux Enable 3 - Negative Supply oltage 4 NOA Channel Input A 5 NO2A Channel Input 2A 6 NO3A Channel Input 3A 7 NO4A Channel Input 4A 8 COA ux Output A 9 COB ux Output B NO4B Channel Input 4B NO3B Channel Input 3B 2 NO2B Channel Input 2B 3 NOB Channel Input B 4 Positive Supply oltage 5 GND Ground 6 A Address Bit AX458/AX459 Truth Tables AX458 (Single 8-to- ux) A2 A A EN ON SWITCH x x x None NO NO2 NO3 NO4 NO5 NO6 NO7 NO8 AX459 (Dual 4-to- ux) A A EN COA COB x x None None NOA NOB NO2A NO2B NO3A NO3B NO4A NO4B 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 3 below the supply rails, reducing its usable dynamic range. As the voltage on one side of the switch approaches within about 3 of either supply rail (a fault condition), the switch impedance increases, limiting the output signal range to approximately 3 less than the appropriate polarity supply voltage. The AX458/AX459 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 CO terminal. This allows railto-rail signal operation. Third, when a signal NO_ exceeds the supply rails (i.e., a fault condition), the voltage on CO_ is limited to the supply rails. Operation is identical for both fault polarities. 9
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps AX458/AX459 NO_ A- NORALLY OPEN SWITCH CONSTRUCTION HIGH FAULT LOW FAULT ON N P AX458 AX459 P2 CO_ GWD - ESO CODE N2 Figure. 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 ±4, with = - =. If the switch is on, the CO_ output current is furnished from the or - pin by booster FETs connected to each supply pin. These FETs can source or sink up to ma. The CO_ pins are not fault protected. If a voltage source is connected to any CO_ 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 aximum Ratings). Figure 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 N and P- channel FET P, which are driven on and off simultaneously, according to the input fault condition and the logic level state. NO_ Input oltage The maximum allowable input voltage for safe operation depends on whether supplies are on or off and the load configuration at the CO output. If CO is referred to a voltage other than ground, but within the supplies, NO_ may range higher or lower than the supplies provided the absolute value of NO_ - CO_ is less than 4. For example, if the load is referred to + at CO_, then the NO_ voltage range can be from +5 to -3. As another example, if the load is connected to - at CO_, the NO_ voltage range is limited to -5 to +3. If the supplies are ±5 and CO is referenced to ground through a load, the maximum NO_ voltage is ±25. If the supplies are off and the CO output is referenced to ground, the maximum NO_ voltage is ±4. Normal Operation Two comparators continuously compare the voltage on the NO_ pin with and - supply voltages. When the signal on NO_ is between and -, the multiplexer behaves normally, with FETs N and P turning on and off in response to A_ signals (Figure ). The parallel
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps combination of N and P forms a low-value resistor between NO_ and CO_ so that signals pass equally well in either direction. Positive Fault Condition When the signal on NO_ exceeds by about 5m, the positive fault comparator output goes high, turning off FETs N and P (Figure ). 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 CO_ are high impedance. If the switch state is on, FET P2 turns on, clamping CO_ to. Negative Fault Condition When the signal on NO_ goes about 5m below -, the negative fault comparator output goes high, turning off FETs N and P (Figure ). 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 CO_ are high impedance. If the switch state is on, FET N2 turns on, clamping CO_ to -. Transient Fault Condition When a fast rising or falling transient on NO_ exceeds or -, the output (CO_) 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.3µs. These values depend on the CO_ output resistance and capacitance. The delays do not depend on the fault amplitude. Higher CO_ output resistance and capacitance increase the recovery times. CO and A_ FETs N2 and P2 can source about ±ma from or - to the CO_ pin in the fault condition (Figure ). Ensure that if the CO_ pin is connected to a lowimpedance load, the absolute maximum current rating of 3mA is never exceeded, either in normal or fault conditions. The GND, CO_, and A_ pins do not have fault protection. Reverse ESD protection diodes are internally connected between GND, CO_, A_, and both and -. If a signal on GND, CO_, or A_ exceeds or - by more than 3m, one of these diodes will conduct. During normal operation, these reverse-biased ESD diodes leak a few nanoamps of current to and - Fault Protection oltage and Power Off The maximum fault voltage on the NO_ pins is ±4 from ground when the power is off. With ±5 supply voltages, the highest voltage on NO_ can be - + 4, and the lowest voltage on NO can be - 4. Exceeding these limits can damage the chip. Logic Level Thresholds The logic level thresholds are COS and TTL compatible with = 3.5 to = 6.5. 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 OSFET with their sources and drains paralleled and their gates driven out of phase to and - by the logic-level translators. 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 and - 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 CO_ have ESD protection diodes to and -. Supply Current Reduction When the logic signals are driven rail-to-rail from to +5 or -5 to +5, the current consumption will be reduced from 37 (typ) to 2. Power Supplies The AX458/AX459 operate with bipolar supplies between ±4.5 and ±2. The and - supplies need not be symmetrical, but their sum cannot exceed the 44 absolute maximum rating. The AX458/AX459 operate from single supplies between +9 and +36 when - is connected to GND. AX458/AX459
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps AX458/AX459 A2 A A +2.4 EN 5Ω A A +2.4 EN 5Ω +5 NO NO2 NO7 AX458 NO8 CO GND - k -5 +5 NOB NOA NO4A NO4B AX459 COB GND - 3Ω + - + - 35pF 35pF LOGIC INPUT A_ SWITCH OUTPUT Test Circuits/Timing Diagrams +3 NO NO8 t TRANS ON 5% 9% t R < 2ns t F < 2ns 9% t TRANS -5 Figure 2. Address Transition Time +5 5Ω EN EN EN A A A2 EN A GND AX458 NO NO2 NO8-5 +5 CO - NOB NOA NO4A NO2B NO4B, COA k + + 35pF LOGIC INPUT EN SWITCH OUTPUT +3 t ON(EN) 5% 9% % t R < 2ns t F < 2ns t OFF(EN) 5Ω A AX459 COB GND - k 35pF -5 Figure 3. Enable Switching Time 2
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps +5 +2.4 EN EN NO NO8 A AX458 A A A2 CO GND - 5Ω k -5 Figure 4. AX458 Break-Before-ake Interval + Test Circuits/Timing Diagrams (continued) 35pF LOGIC INPUT A SWITCH OUTPUT +3 +5 5% 8% t OPEN t R < 2ns t F < 2ns AX458/AX459 +5 R S S CHANNEL SELECT EN NO EN A A A2 AX458 CO GND - -5 C L nf LOGIC INPUT EN +3 OFF ON OFF Δ Δ IS THE EASURED OLTAGE DUE TO CHARGE TRANSFER ERROR CTE WHEN THE CHANNEL TURNS OFF. CTE = Δ C L Figure 5. Charge Injection +5 nf +5 nf IN R S = 5Ω NO NO8 AX458 A A A2 GND EN CO - R L 75Ω R kω R G = 5Ω IN NO NO2 NO8 AX458 A A A2 GND EN CO - R L 75Ω nf -5 OFF-ISOLATION = 2log IN nf -5 CROSSTALK = 2log IN Figure 6. Off-Isolation Figure 7. Crosstalk 3
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps AX458/AX459 CHANNEL SELECT A2 A A GND +5 AX458 EN CO - -5 NO NO8 Figure 8. NO_, CO_ Capacitance Hz CAPACITANCE ANALYZER f = Hz Test Circuits/Timing Diagrams (continued) NO _ +25-5 -25 +5 Figure 9. Transient Behavior of Fault Condition CO_ Functional Diagrams/Truth Tables AX458 - GND AX458 NO NO2 NO3 NO4 NO5 NO6 NO7 NO8 DECODERS/DRIERS CO A2 A A EN ON SWITCH X X X NONE 2 3 4 5 6 7 8 A A A2 EN LOGIC "" AL +.8, LOGIC "" AH +2.4 AX459 - GND NOA NO2A NO3A NO4A NOB NO2B NO3B NO4B DECODERS/DRIERS COA COB A A EN ON SWITCH X X AX459 NONE 2 3 4 LOGIC "" AL +.8, LOGIC "" AH +2.4 A A EN 4
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps Ordering Information (continued) PART TEP RANGE *Contact factory for dice specifications. **Contact factory for availability. +Denotes a lead-free package. PIN- PACKAGE PKG CODE AX459CSE+ C to +7 C 6 Narrow SO S6-8 AX459CPE+ C to +7 C 6 Plastic DIP P6-4 AX459C/D C to +7 C Dice* AX459ESE+ -4 C to +85 C 6 Narrow SO S6-8 AX459EPE+ -4 C to +85 C 6 Plastic DIP P6-4 AX459JE -4 C to +85 C 6 CERDIP** J6-3 - N N2 EN A A A2 Chip Topography GND N5.98" (5.3mm) N6 AX458/AX459 N3 N4 N8 N7 CO.86" (2.8mm) N.C. SUBSTRATE IS INTERNALLY CONNECTED TO 5
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps AX458/AX459 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.) N TOP IEW D e B A FRONT IEW E A H C L SIDE IEW -8 INCHES ILLIETERS DI IN AX IN AX A.53.69.35.75 A.4...25 B.4.9.35.49 C.7..9.25 e.5 BSC.27 BSC E.5.57 3.8 4. H.244.228 5.8 6.2 L.6.5.4.27 ARIATIONS: DI D D D INCHES ILLIETERS IN AX IN AX N S2 5. 4.8 8.89.97 AA 8.75 8.55 4.337.344 AB.386.394 AC 9.8. 6 SOICN.EPS PROPRIETARY INFORATION TITLE: PACKAGE OUTLINE,.5" SOIC APPROAL DOCUENT CONTROL NO. RE. 2-4 B PDIPN.EPS 6
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers 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 AX458/AX459 7
Fault-Protected, High-oltage Single 8-to-/ Dual 4-to- ultiplexers with Output Clamps AX458/AX459 REISION NUBER REISION DATE DESCRIPTION Revision History PAGES CHANGED 5 /7 EC table changes and stylistic corrections 2 5 axim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a axim product. No circuit patent licenses are implied. axim reserves the right to change the circuitry and specifications without notice at any time. 8 axim Integrated Products, 2 San Gabriel Drive, Sunnyvale, CA 9486 48-737-76 27 axim Integrated Products is a registered trademark of axim Integrated Products, Inc.