19-1452; Rev 0; 4/99 Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch Features The MAX4533 quad, single-pole/double-throw (SPDT), fault-protected analog switch is pin-compatible with the industry-standard MAX333 and MAX333A. The MAX4533 features fault-protected inputs and Rail-to-Rail® signal handling. The normally open (NO_ ) and normally closed (NC_ ) terminals are protected from overvoltage faults up to ±25V with power on and up to ±40V with power off. During a fault condition, NO_ and NC_ become high impedance with only nanoamperes of leakage current flowing to the source. In addition, the output (COM_) clamps to the appropriate polarity supply rail and provides up to ±10mA of load current. This ensures unambiguous rail-to-rail outputs when a fault occurs. ♦ Rail-to-Rail Signal Handling The MAX4533 operates from dual ±4.5V to ±18V power supplies or a single +9V to +36V supply. All digital inputs have +0.8V and +2.4V logic thresholds, ensuring both TTL and CMOS logic compatibility when using ±15V supplies or a +12V supply. On-resistance is 175Ω max and is matched between switches to 10Ω max. The offleakage current is only 0.5nA at TA = +25°C and 10nA at TA = +85°C. ♦ 20ns (typ) Fault Response Time Applications Redundant/Backup Systems Portable Instruments Test Equipment Communications Systems Data-Acquisition Systems Industrial and Process Control Avionics Systems ♦ ±40V Fault Protection with Power Off ±25V Fault Protection with ±15V Supplies ♦ All Switches Off with Power Off ♦ No Power-Supply Sequencing Required During Power-Up or Power-Down ♦ Output Clamped to Appropriate Supply Voltage During Fault Condition—No Transition Glitch ♦ 1kΩ (typ) Output Clamp Resistance During Overvoltage ♦ 175Ω (max) Signal Paths with ±15V Supplies ♦ ±4.5V to ±18V Dual Supplies +9V to +36V Single Supply ♦ Pin-Compatible with Industry-Standard MAX333/MAX333A ♦ TTL/CMOS-Compatible Logic Inputs with ±15V or Single +9V to +15V Supplies Ordering Information PART TEMP. RANGE MAX4533CAP PIN-PACKAGE 0°C to +70°C 20 SSOP MAX4533CSP 0°C to +70°C 20 Wide SO Ordering Information continued at end of data sheet. Pin Configuration/ Functional Diagram Typical Operating Circuit OUTPUTS INPUTS V1 V1 - V2 V2 TOP VIEW IN1 1 20 IN4 NO1 2 19 NO4 COM1 3 OSC IN 18 COM4 NC1 4 MAX4533 GND 6 V3 - V4 V3 NC2 7 COM2 8 V4 FLYING CAPACITOR LEVEL TRANSLATOR (2-CHANNEL) 17 NC4 V- 5 16 V+ MAX4533 15 N.C. 14 NC3 13 COM3 NO2 9 12 NO3 IN2 10 11 IN3 SSOP/SO/DIP/CERDIP Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. † Patent Pending SWITCHES ARE SHOWN WITH LOGIC "0" INPUT N.C. = NOT INTERNALLY CONNECTED ________________________________________________________________ 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. MAX4533† General Description 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_, IN_ (Note 1) ............................. (V- - 0.3V) to (V+ + 0.3V) NC_, NO_ (Note 2)..................................(V+ - 40V) to (V- + 40V) NC_, NO_ to COM_ .................................................-40V to +40V NC_, NO_ Overvoltage with Switch Power On (supplies at ±15V) ................................................-30V to +30V NC_, 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)....................................±50mA Continuous Power Dissipation (TA = +70°C) SSOP (derate 10.53mW/°C above +70°C) ...................842mW Wide SO (derate 10.00mW/°C above +70°C).............. 800mW Plastic DIP (derate 11.11mW/°C above +70°C) ...........889mW CERDIP (derate 11.11mW/°C above +70°C) ................889mW Operating Temperature Ranges MAX4533C_ _ ......................................................0°C to +70°C MAX4533E_ _ ...................................................-40°C to +85°C MAX4533M_ _.................................................-55°C to +125°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+300°C Note 1: COM_ and IN_ pins are not fault protected. Signals on COM_ or IN_ exceeding V+ or V- are clamped by internal diodes. Limit forward diode current to maximum current rating. Note 2: NC_ and NO_ pins are fault protected. Signals on NC_ or NO_ exceeding -25V to +25V may damage the device. These limits apply with power applied to V+ or V-. The limit is ±40V with V+ = V- = 0. 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, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER SYMBOL CONDITIONS Fault-Free Analog Signal Range (Note 2) VNO_, VNC_ V+ = +15V, V- = -15V, VNO_ or VNC_ = ±15V COM_ to NO_ or COM_ to NC_ On-Resistance RON VNO_ or VNC_ = ±10V, ICOM_ = 1mA COM_ to NO_ or COM_ to NC_ On-Resistance Match Between Channels (Note 4) ∆RON VNO_ or VNC_ = ±10V, ICOM_ = 1mA TA MIN C, E, M V- TYP MAX UNITS V+ V ANALOG SWITCH VCOM_ = +5V, 0, -5V, ICOM_ = 1mA On-Resistance Flatness NO_ or NC_ Off-Leakage Current (Note 5) INO_(OFF), INC_(OFF) COM_ On-Leakage Current (Note 5) ICOM_(ON) +25°C C, E M +25°C 125 175 Ω 1 200 250 6 10 15 Ω C, E M +25°C Ω 4 +25°C C, E M +25°C VCOM_ = ±14V, C, E VNO_ or VNC_= ±14V or floating M -0.5 -10 -200 -0.5 -20 -400 Applies with power on Applies with power off -25 -40 -10 -200 -10 -20 -200 -10 VNO_ or VNC_ = ±14V, VCOM_ = 14V ± 0.02 0.01 0.5 10 200 0.5 20 400 nA nA FAULT Fault-Protected Analog Signal Range (Note 2) VNO_, VNC_ COM_ Output Leakage Current, Supplies On ICOM_ NO_ or NC_ Off Input Leakage Current, Supplies On INO_, INC_ 2 VNO_ or VNC_ = ±25V, no connection to “ON” channel VNO_ or VNC_ = ±25V, VCOM_ = 10V ± MAX4533 Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch +25°C +25°C +25°C C, E M +25°C C, E M _______________________________________________________________________________________ +25 +40 10 200 10 20 200 10 V nA µA nA µA Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch MAX4533 ELECTRICAL CHARACTERISTICS—Dual Supplies (continued) (V+ = +15V, V- = -15V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER NO_ or NC_ Input Leakage Current, Supplies Off SYMBOL CONDITIONS INO_, INC_ VNO_ or VNC_ = ±40V, V+ = 0, V- = 0 COM_ On-Clamp Output Current, Supplies On ICOM_ VNO_ or VNC_ = +25V VNO_ or VNC_ = -25V COM_ On-Clamp Output Resistance, Supplies On RCOM_ VNO_ or VNC = ±25V TA MIN TYP MAX +25°C C, E M +25°C +25°C +25°C C, E, M -20 -200 -10 8 -12 0.1 20 200 10 13 -7 2.5 3 11 -10 1.0 UNITS nA µA mA kΩ ±Fault Output Clamp Turn-On Delay Time (Note 6) RL = 10kΩ, VNO_ or VNC_ = ±25V +25°C 20 ns ±Fault Recovery Time (Note 6) RL = 10kΩ, VNO_ or VNC_ = ±25V +25°C 2.5 µs LOGIC INPUT IN_ Input Logic Threshold High VIN_H C, E, M IN_ Input Logic Threshold Low VIN_L C, E, M IN_ Input Current Logic High or Low IIN_H, IIN_L VIN_ = +0.8V or +2.4V 2.4 V 0.8 +25°C -1 C, E, M -5 0.03 1 5 V µA SWITCH DYNAMIC CHARACTERISTICS +25°C C, E M +25°C C, E M Turn-On Time tON VCOM_ = ±10V, RL = 2kΩ; Figure 2 Turn-Off Time tOFF VNO_ = ±10V, RL = 2kΩ; Figure 2 Break-Before-Make Time Delay tBBM VCOM_ = ±10V, RL = 1kΩ; Figure 3 +25°C CL = 100pF, VCOM_ = 0; Figure 4 +25°C CN_(OFF) f = 1MHz; Figure 5 CCOM_(ON) f = 1MHz; Figure 5 Charge Injection (Note 6) NO_ or NC_ Off-Capacitance COM_ On-Capacitance Q Off-Isolation (Note 7) VISO RL = 50Ω, CL = 15pF, VN_ = 1VRMS, f = 1MHz; Figure 6 Channel-to-Channel Crosstalk (Note 8) VCT RL = 50Ω, CL = 15pF, VN_ = 1VRMS, f = 1MHz; Figure 6 100 60 10 250 400 600 150 300 450 ns ns 50 ns 1.5 pC +25°C 5 pF +25°C 12 pF +25°C -62 dB +25°C -66 dB POWER SUPPLY Power-Supply Range V+, V- ±4.5 ±18 +25°C 600 V+ Supply Current I+ All VIN_ = 0 or +5V, VNO_ = VNC_ = 0 C, E, M 1000 V- Supply Current I- All VIN_ = 0 or +5V, VNO_ = VNC_ = 0 +25°C 400 C, E, M 600 IGND All VIN_ = 0 or +5V, VNO_ = VNC_ = 0 +25°C 300 C, E, M 450 GND Supply Current V µA µA µA _______________________________________________________________________________________ 3 MAX4533 Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch ELECTRICAL CHARACTERISTICS—Single Supply (V+ = +12V, V- = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA MIN C, E, M 0 TYP MAX UNITS V+ V ANALOG SWITCH Fault-Free Analog Signal Range (Note 2) COM_ to NO_, COM_ to NC_ On-Resistance COM_ -NO_ On-Resistance Match Between Channels (Note 4) VNO_, VNC_ V+ = +12V, V- = 0, VNO_ or VNC_ = +12V or 0 RON V+ = +12V, VNO_ or VNC_ = +10V, ICOM_ = 1mA ∆RON V+ = +12V, VNO_ or VNC_ = +10V, ICOM_ = 1mA NO_ or NC_ Off-Leakage Current (Notes 5, 9) INO_(OFF), INC_(OFF) COM_ On-Leakage Current (Notes 5, 9) ICOM_(ON) +25°C C, E M +25°C C, E M +25°C V+ = +12V, VCOM_ = +10V, +1V, C, E VNO_ or VNC_ = +1V, +10V M +25°C V+ = +12V, VCOM_ = +10V, C, E VNO_ or VNC_= +10V or floating M -0.5 -10 -200 -0.5 -20 -400 260 390 Ω 4 450 525 10 20 30 0.5 10 200 0.5 20 400 Ω 0.01 0.01 nA nA FAULT Fault-Protected Analog Signal Range (Note 2) COM_ Output Leakage Current, Supply On (Note 9) NO_ or NC_ Off Input Leakage Current, Supply On (Note 9) NO_ or NC_ Input Leakage Current, Supply Off (Note 9) VNO_, VNC_ ICOM_ INO_, INC_ Applies with power on Applies with power off VNO_ or VNC_ = ±25V, V+ = +12V, no connection to “ON” channel VNO_ or VNC_ = ±25V, VCOM_ = 0, V+ = +12V +25°C +25°C +25°C C, E M +25°C C, E M +25°C C, E M -25 -40 -10 -200 -10 -20 -200 -10 -20 -200 -10 2 INO_, INC_ VNO_ or VNC_ = ±40V, V+ = 0, V- = 0 COM_ On-Clamp Output Current, Supply On ICOM_ VNO_ or VNC_ = ±25V, V+ = +12V +25°C COM_ On-Clamp Output Resistance, Supply On RCOM_ VNO_ or VNC_ = ±25V, V+ = +12V +25°C LOGIC INPUT IN_ Input Logic Threshold High IN_ Input Logic Threshold Low IN_ Input Current Logic High or Low 4 VIN_H VIN_L IIN_H, IIN_L VIN_ = +0.8V or +2.4V C, E, M C, E, M +25°C C, E, M 0.1 +25 +40 10 200 10 20 200 10 20 200 10 nA µA nA µA nA µA 3 5 mA 2.4 5 kΩ 0.03 0.8 1 5 2.4 -1 -5 V _______________________________________________________________________________________ V V µA Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch MAX4533 ELECTRICAL CHARACTERISTICS—Single Supply (continued) (V+ = +12V, V- = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS SWITCH DYNAMIC CHARACTERISTICS +25°C Turn-On Time tON VCOM_ = +10V, RL = 2kΩ; Figure 2 Turn-Off Time tOFF VCOM_ = +10V, RL = 2kΩ; Figure 2 Break-Before-Make Time Delay tBBM VCOM_ = +10V, RL = 1kΩ; Figure 3 +25°C CL = 100pF, VCOM_ = 0; Figure 4 +25°C CN_(OFF) f = 1MHz; Figure 5 CCOM_(ON) f = 1MHz; Figure 5 Charge Injection Q NO_ or NC_ Off-Capacitance COM_ On-Capacitance 200 C, E, M 500 1000 +25°C 100 C, E, M 300 900 5 ns ns 100 ns 2 pC +25°C 5 pF +25°C 15 pF Off-Isolation (Note 7) VISO RL = 50Ω, CL = 15pF, VNO_ = 1VRMS, f = 1MHz; Figure 6 +25°C -62 dB Channel-to-Channel Crosstalk (Note 8) VCT RL = 50Ω, CL = 15pF, VNO_ = 1VRMS, f = 1MHz; Figure 6 +25°C -65 dB POWER SUPPLY Power-Supply Range V+ Supply Current I+ V- and GND Supply Current Note 3: Note 4: Note 5: Note 6: Note 7: Note 8: Note 9: V+ IGND C, E, M 9 36 All VIN_ = 0 or +5V, VNO_ = VNC_ = 0 +25°C 350 C, E, M 550 All VIN_ = 0 or +12V, VNO_ = VNC_ = 0 +25°C 200 C, E, M 350 All VIN_ = 0 or +5V, VNO_ = VNC_ = 0 +25°C 350 C, E, M 550 V µA µA µA The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column. ∆RON = RON(MAX) - RON(MIN). Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at TA = +25°C. Guaranteed by design. Off-isolation = 20log10(VCOM_ / VNO_), VCOM_ = output, VNO_ = input to off switch. Between any two analog inputs. Leakage testing for single-supply operation is guaranteed by testing with dual supplies. _______________________________________________________________________________________ 5 Typical Operating Characteristics (V+ = +15V, V- = -15V, TA = +25°C, unless otherwise noted.) 350 V+ = +20V V+ = +25V V+ = +30V 200 150 75 50 0 9 12 15 18 5 10 TA = +25°C TA = 0°C 150 TA = -40°C TA = -55°C 100 35 -15 40 6 8 10 1 0.01 1.5 5 25 45 65 85 105 125 TEMPERATURE (°C) -15 200 -10 tON, tOFF (ns) tOFF tON 150 tOFF 100 -5 0 VCOM (V) 10 15 200 180 160 tON 120 100 tOFF 80 60 40 50 100 V+ = +15V V- = -15V 20 0 0 0 ±4 6 5 TURN-ON/TURN-OFF TIME vs. TEMPERATURE (DUAL SUPPLIES) MAX4533 toc07b 250 MAX4533 toc07a MAX4533 toco6 0 -55 -35 -15 140 300 200 SINGLE SUPPLY 0.5 TURN-ON/TURN-OFF TIME vs. SUPPLY VOLTAGE (SINGLE SUPPLY) tON 400 DUAL SUPPLIES 1.0 INC_OFF (V+ = +12V, V- = 0) TURN-ON/TURN-OFF TIME vs. SUPPLY VOLTAGE (DUAL SUPPLIES) 500 15 2.5 2.0 VCOM (V) 600 3.0 0.1 12 10 3.5 INC_OFF (V+ = +15V, V- = -15V) tON, tOFF (ns) 4 5 4.0 ICOM_ON (V+ = +12V, V- = 0) 10 0 VCOM (V) 4.5 0.0001 0 2 -5 CHARGE INJECTION vs. VCOM ICOM_ON (V+ = +15V, V- = -15V) 100 0.001 V+ = +12V V- = 0 50 0 -10 5.0 Q (pC) TA = +70°C 200 30 1000 LEAKAGE CURRENT (A) 350 250 25 MAX4533 toc05 TA = +85°C 300 20 ON/OFF-LEAKAGE CURRENT vs. TEMPERATURE MAX4533 toc04 TA = +125°C 400 15 VCOM (V) 450 V+ = +15V V- = -15V 0 0 ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY) RON (Ω) 25 V- = 0 6 TA = 0°C TA = -40°C TA = -55°C 50 V+ = +36V -18 -15 -12 -9 -6 -3 0 3 VCOM (V) TA = +25°C 125 100 100 V± = ±15V V± = ±18V 150 MAX4533 toc08a 180 150 120 90 60 30 0 175 RON (Ω) V± = ±10V V± = ±12V TA = +85°C TA = +70°C 200 V+ = +15V 250 TA = +125°C 225 V+ = +12V MAX4533 toc03 V+ = +9V 300 250 MAX4533toc02 V± = ±4.5V ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES) 400 MAX4533 toc01 390 360 330 300 270 240 210 ON-RESISTANCE vs. VCOM (SINGLE SUPPLY) RON (Ω) RON (Ω) ON-RESISTANCE vs. VCOM (DUAL SUPPLIES) tON, tOFF (ns) MAX4533 Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch ±6 ±8 ±10 ±12 ±14 SUPPLY VOLTAGE (V) ±16 ±18 8 12 16 20 24 28 SUPPLY VOLTAGE (V) 32 36 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (°C) _______________________________________________________________________________________ Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch POWER-SUPPLY CURRENT vs. TEMPERATURE (DUAL SUPPLIES, VIN = 0) 300 150 tOFF 100 I+ 200 100 IGND 0 -100 -200 I+ I- 400 IGND 200 0 -200 I- -300 V+ = +12V V- = 0 -400 V+ = +15V V- = -15V -400 -500 0 -55 -35 -15 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (°C) 300 250 I+ 200 150 IGND 100 MAX4533 toc10 2.5 DUAL-SUPPLY RANGE 2.0 SINGLE-SUPPLY RANGE 1.5 5 25 45 65 85 105 125 TEMPERATURE (°C) OVERVOLTAGE WITH ±25V INPUT 3.0 LOGIC-LEVEL THRESHOLD (V) MAX4533 toc09c V+ = +12V V- = 0 VIN = +5V 350 -600 -55 -35 -15 LOGIC-LEVEL THRESHOLD vs. SUPPLY VOLTAGE POWER-SUPPLY CURRENT vs. TEMPERATURE (SINGLE SUPPLY) 400 5 25 45 65 85 105 125 TEMPERATURE (°C) V+ = +15V V- = -15V MAX4533 toc11 50 NO_ or NC_ (10V/div) OV COM_ (10V/div) OV 1.0 0.5 50 0 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (°C) 4 8 12 16 20 24 28 SUPPLY VOLTAGE (V) FAULT-FREE SIGNAL WITH ±15V INPUT NO_ or NC_ (10V/div) OV 32 5µs/div 36 FAULT RECOVERY TIME MAX4533 toc13 0 MAX4533 toc12 SUPPLY CURRENT (µA) 600 SUPPLY CURRENT (µA) tON 800 MAX4533 toc09a 400 SUPPLY CURRENT (µA) 200 tON, tOFF (ns) 500 MAX4533 toc08b 250 POWER-SUPPLY CURRENT vs. TEMPERATURE (DUAL SUPPLIES, VIN = +5V) MAX4533 toc09b TURN-ON/TURN-OFF TIME vs. TEMPERATURE (SINGLE SUPPLY) NO_ or NC_ (10V/div) OV COM_ (10V/div) COM_ (10V/div) OV OV 5µs/div 2µs/div _______________________________________________________________________________________ 7 MAX4533 Typical Operating Characteristics (continued) (V+ = +15V, V- = -15V, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (V+ = +15V, V- = -15V, TA = +25°C, unless otherwise noted.) FREQUENCY RESPONSE (DUAL SUPPLIES) FREQUENCY RESPONSE (SINGLE SUPPLY) BANDWIDTH 0 -20 -20 -30 RESPONSE (dB) -40 -50 OFF ISOLATION -40 -50 OFF ISOLATION -60 CROSSTALK -70 BANDWIDTH -10 -30 -60 MAX4533 toc14b -10 MAX4533 toc14a 0 RESPONSE (dB) MAX4533 Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch CROSSTALK -70 -80 -80 -90 V+ = +15V V- = -15V -100 0.01 0.1 1 10 100 -90 V+ = +12V V- = 0 -100 1000 0.01 0.1 FREQUENCY (MHz) 1 10 100 1000 FREQUENCY (MHz) Pin Description PIN NAME 1, 10, 11, 20 IN1, IN2, IN3, IN4 2, 9, 12, 19 NO1, NO2, NO3, NO4 3, 8, 13, 18 COM1, COM2, COM3, COM4 4, 7, 14, 17 NC1, NC2, NC3, NC4 5 V- FUNCTION Logic Control Digital Inputs Normally Open Inputs* Analog Switch Common Outputs* Normally Closed Inputs* Negative Analog Supply Voltage Input 6 GND Digital Ground 15 N.C. No Connection. Not internally connected. 16 V+ Positive Analog and Digital Supply-Voltage Input *When the voltage on NO_ or NC_ does not exceed V+ or V-, NO_ (or NC_) and COM_ pins are bidirectional. Detailed Description The MAX4533 is a fault-protected analog switch with special operation and construction. Traditional fault-protected switches are constructed using three-series CMOS devices. This combination produces good fault protection but fairly high on-resistance when the signals are within about 3V of each supply rail. These series devices are not capable of handling signals up to the power-supply rails. The MAX4533 differs considerably from traditional faultprotected switches, with three advantages. First, it is constructed with two parallel FETs, allowing very low on-resistance when the switch is on. Second, they allow signals on the NC_ or NO_ pins that are within or slightly 8 beyond the supply rails to be passed through the switch to the COM_ terminal, allowing rail-to-rail signal operation. Third, when a signal on NC_ or NO_ exceeds the supply rails by about 150mV (a fault condition), the voltage on COM_ is limited to the appropriate polarity supply voltage. Operation is identical for both fault polarities. The fault-protection extends to ±25V with power on and ±40V with power off. The MAX4533 has a parallel N-channel and P-channel MOSFET switch configuration with input voltage sensors. The simplified internal structure is shown in Figure 1. The parallel N1 and P1 MOSFETs form the switch element. N3 and P3 are sensor elements to sample the input voltage and compare it against the power-supply rails. _______________________________________________________________________________________ Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch -15V COMPARATOR N3 N-CHANNEL DRIVER The MAX4533 protects devices connected to its output (COM_) through its unique fault-protection circuitry. When the input voltage is raised above either supply rail, the internal sense and comparator circuitries (N3 and N-channel driver or P3 and P-channel driver) disconnect the output (COM_) from the input (Figure 1). -V(-15V) SENSE SWITCH CLAMP N2 NC_ or INPUT NO_ N1 OUTPUT COM_ CLAMP P2 P1 P3 SENSE SWITCH +V(+15V) +15V P-CHANNEL DRIVER If the switch driven above the supply rail has an on state, the clamp circuitries (N2 or P2) connect the output to the appropriate supply rail. Table 1 summarizes the MAX4533’s operation under normal and fault conditions. Row 5 shows a negative fault condition when the supplies are on. It shows that with supplies of ±15V, if the input voltage is between -15V and -25V, the output (COM_) clamps to the negative supply rail of -15V. With this technique, the SPDT switch is capable of withstanding a worse-case condition of opposite fault polarities at its inputs. Transient Fault Condition +15V COMPARATOR Figure 1. Simplified Internal Structure During normal operation of a conducting channel, N1 and P1 remain on with a typical 125Ω on-resistance between NO_ (or NC_) and COM_. If the input voltage exceeds either supply rail by about 150mV, the parallel combination switches (N1, P1) are forced off through the driver and sensing circuitries. At the same time, the output (COM_ ) is clamped to the appropriate supply rail by the clamp circuitries (N2, P2). Two clamp circuits limit the output voltage to the supply voltages. For simplicity, Figure 1 shows only one side of the SPDT switch configuration. The complete circuit is composed of two channels with their outputs connected. Normal Operation Two comparators continuously compare the voltage on the NO_ (or NC_ ) pin with V+ and V- supply voltages. When the signal on NO_ (or NC_ ) is between V+ and V-, the switch behaves normally, with FETs N1 and P1 turning on and off in response to NO_ (or NC_) signals (Figure 1). For any voltage between the supply rails, the switch is bidirectional; therefore, COM_ and NC_ (or NO_ ) are interchangeable. Only NO_ and NC_ can be exposed to overvoltages beyond the supply range and within the specified breakdown limits of the device. When a fast rising or falling transient on NO_ (or NC_) exceeds V+ or V-, the output (COM_) follows the input (IN_) to the supply rail by only a few nanoseconds. This delay is due to the switch on-resistance and circuit capacitance to ground. However, when the input transient returns to within the supply rails there is a longer recovery time. For positive faults, the recovery time is typically 2.5µs. For negative faults, the recovery time is typically 1.3µs. These values depend on the COM_ output resistance and capacitance. The delays are not dependent on the fault amplitude. Higher COM_ output resistance and capacitance increase the recovery times. Fault Protection, Voltage, and Power Off The maximum fault voltage on the NO_ or NC_ pins is ±40V from ground when the power is off. With ±15V supply voltages, the highest voltage on NO_ (or NC_) can be +25V, and the lowest voltage on NO_ (or NC_) can be -25V. Exceeding these limits can damage the chip. IN_ Logic-Level Thresholds The logic-level thresholds are TTL/CMOS-compatible when V+ is +15V. Raising V+ increases the threshold slightly; when V+ reaches +25V, the level threshold is 2.8V—higher than the TTL output high-level minimum of 2.4V, but still compatible with CMOS outputs (see the Typical Operating Characteristics). Increasing V- has no effect on the logic-level thresholds, but it does increase the gate-drive voltage to the signal FETs, reducing their on-resistance. _______________________________________________________________________________________ 9 MAX4533 Fault Condition -15V MAX4533 Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch Table 1. Switch States in Normal and Fault Conditions POWER SUPPLIES (V+, V-) INPUT RANGE NC_ NO_ OUTPUT On Between Rails On Off NC_ On Between Rails Off On NO_ On Between V+ and (+40V - V+) On Off V+ On Between V+ and (+40V - V+) Off On V+ On Between V- and (-40V - V-) On Off V- On Between V- and (-40V - V-) Off On V- Off Follows the load terminal voltage. Off Between Rails Off Failure Modes The MAX4533 is not a lightning arrester or surge protector. Exceeding the fault-protection voltage limits on NO_ or NC_, even for very short periods, can cause the device to fail. Applications Information Ground There is no connection between the analog signal paths and GND. The analog signal paths consist of an N-channel and 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 switches. This drive signal is the only connection between the power supplies and the analog signals. GND, IN_, and COM_ have ESD protection diodes to V+ and V-. Supply Current Reduction When the logic signals are driven rail-to-rail from 0 to +12V or -15V to +15V, the supply current reduces to approximately half of the supply current when the logic input levels are at 0 to 5V. Power Supplies The MAX4533 operates with bipolar supplies between ±4.5V and ±18V. The V+ and V- supplies need not be symmetrical, but their difference can not exceed the absolute maximum rating of +44V. The MAX4533 operates from a single supply between +9V and +36V when V- is connected to GND. Test Circuits/Timing Diagrams t R < 20ns t F < 20ns 3V 50% V IN MAX4533 50% NC_ +10V NO_ -10V t ON t OFF 2kΩ IN_ t OPEN +10V V COM SWITCH OUTPUT COM_ 0V 50% 50% 0V 50% -10V LOGIC INPUT V+ GND V- 50% +15V -15V t OFF t ON t OPEN (REPEAT TEST FOR IN2, IN3, AND IN4.) Figure 2. Switching-Time Test Circuit 10 ______________________________________________________________________________________ Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch +15V LOGIC INPUT +3V 50% 0V NC VO1 0.9VO IN_ 0V SWITCH OUTPUT VCOM LOGIC INPUT 0.9VO VO2 VO1 NO V COM COM_ VCOM SWITCH OUTPUT V+ MAX4533 RL2 V- GND -15V 0V tD CL1 RL1 VO2 CL2 R L = 1000Ω C L = 35pF tD CL INCLUDES FIXTURE AND STRAY CAPACITANCE. LOGIC 0 INPUT. Figure 3. Break-Before-Make V+ V+ V+ VIN_ VCOM_ IN_ 50Ω VIN_ 0V MAX4533 NC_ OR NO_ GND VOUT ∆ VOUT VOUT CL 100pF V- V- ∆ VOUT IS THE MEASURED VOLTAGE DUE TO CHARGETRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. Q = ∆ VOUT x CL V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION. Figure 4. Charge Injection V+ V+ NO_ V+ MAX4533 ADDRESS SELECT NC_ COM_ IN_ GND 1MHz CAPACITANCE ANALYZER V- VV- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION. Figure 5. COM_, NO_, NC_ Capacitance ______________________________________________________________________________________ 11 MAX4533 Test Circuits/Timing Diagrams (continued) Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch MAX4533 Test Circuits/Timing Diagrams (continued) V+ 10nF NETWORK ANALYZER V+ VIN 50Ω 50Ω COM_ MAX4533 ADDRESS SELECT VOUT IN_ NO_, NC_ V- GND MEAS. REF. 50Ω OFF ISOLATION = 20 log VOUT VIN ON LOSS = 20 log VOUT VIN CROSSTALK = 20 log VOUT VIN 50Ω 10nF VMEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT SOCKET TERMINALS. OFF ISOLATION IS MEASURED BETWEEN COM_ AND “OFF” NO_ OR NC_ TERMINALS. ON LOSS IS MEASURED BETWEEN COM_ AND “ON” NO_ OR NC_ TERMINALS. CROSSTALK IS MEASURED BETWEEN COM_ TERMINALS WITH ALL SWITCHES ON. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED. V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION. Figure 6. Frequency Response, Off-Isolation, and Crosstalk Ordering Information (continued) PART MAX4533CPP MAX4533EAP TEMP. RANGE 0°C to +70°C -40°C to +85°C PIN-PACKAGE 20 Plastic DIP 20 SSOP MAX4533ESP MAX4533EPP MAX4533MJP -40°C to +85°C -40°C to +85°C -55°C to +125°C 20 Wide SO 20 Plastic DIP 20 CERDIP Chip Information TRANSISTOR COUNT: 448 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. 12 ____________________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.