19-4804; Rev 0; 9/02 Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers Features ♦ No Power-Supply Sequencing Required ♦ All Channels Off with Power Off ♦ Rail-to-Rail Signal Handling ♦ 400Ω (max) On-Resistance ♦ ±40V Fault Protection with Power Off ♦ ±25V Fault Protection with ±15V Supplies ♦ 100ns Fault-Response Time ♦ ±4.5V to ±20V Dual Supplies ♦ +9V to +36V Single Supply ♦ TTL/CMOS-Compatible Logic Inputs Ordering Information PART Applications TEMP RANGE PIN-PACKAGE MAX4708ESE -40°C to +85°C 16 Narrow SO MAX4708EWE -40°C to +85°C 16 Wide SO Data-Acquisition Systems MAX4708EPE -40°C to +85°C 16 Plastic DIP Industrial and Process Control MAX4709ESE -40°C to +85°C 16 Narrow SO Avionics MAX4709EWE -40°C to +85°C 16 Wide SO MAX4709EPE -40°C to +85°C 16 Plastic DIP Signal Routing Redundancy/Backup Systems ATE Systems Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. Hot Swap Pin Configurations/Functional Diagrams TOP VIEW MAX4708 MAX4709 A0 1 16 A1 A0 1 EN 2 15 A2 EN 2 14 GND V- 3 V- 3 NO1 4 NO2 5 LOGIC 16 A1 15 GND LOGIC 14 V+ 13 V+ NO1A 4 13 NO1B 12 NO5 NO2A 5 12 NO2B NO3 6 11 NO6 NO3A 6 11 NO3B NO4 7 10 NO7 NO4A 7 10 NO4B NO8 COMA 8 9 COM 8 9 SO/DIP COMB SO/DIP Pin Configurations/Functional Diagrams continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX4708/MAX4709 General Description The MAX4708/MAX4709 8-to-1 and dual 4-to-1 fault-protected multiplexers are pin compatible with the industrystandard DG508/DG509. The MAX4708/MAX4709 are similar to the MAX4508/MAX4509, but these devices do not have clamp diodes to the supply rails on the switch outputs. These multiplexers feature fault-protected inputs, Rail-to-Rail® signal-handling capability, and do not require power-supply sequencing. Both devices offer ±40V overvoltage protection with the supplies off, ±36V protection with the supplies on, and feature 400Ω (max) on-resistance with 15Ω (max) matching between channels. The MAX4708/MAX4709 operate with dual supplies of ±4.5V to ±20V or a single supply of +9V to +36V. All digital inputs have TTL logiccompatible thresholds, ensuring both TTL and CMOS logic compatibility when using a single +12V supply or dual ±15V supplies. For low-voltage applications requiring fault protection, refer to the MAX4711/MAX4712/MAX4713 data sheet. MAX4708/MAX4709 Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers ABSOLUTE MAXIMUM RATINGS (All 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_, EN (Note 1)........................ (V+ + 0.3V) to (V- - 0.3V) NO_.........................................................(V+ - 40V) to (V- + 40V) NO_ to COM_ ..........................................................-36V to +36V NO_ Voltage with Switch Power On ........................-30V to +30V NO_ Voltage with Switch Power Off ........................-40V to +40V Continuous Current into any Terminal. .............................±30mA Peak Current into any Terminal (pulsed at 1ms, 10% duty cycle)................................±100mA Continuous Power Dissipation (TA = +70°C) 16 Narrow SO (derate 8.70mW/°C above +70°C) .......696mW 16 Plastic DIP (derate 10.53mW/°C above +70°C) .....842mW 16 Wide SO (derate 9.52mW/°C above +70°C)...........762mW Operating Temperature Range MAX4708E_ E/MAX4709E_E ...........................-40°C to +85°C Junction Temperature ..................................................... +150°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10s) .................................+300°C Note 1: COM_, EN, and A_ pins are not fault protected. Signals on COM_, EN, or A_ exceeding V+ or V- are clamped by internal diodes. Limit forward-diode current to maximum current rating. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS—Dual Supplies (V+ = +15V, V- = -15V, VA_H = +2.4V, VA_L = +0.8V, VEN = +2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS TA MIN E V- TYP MAX UNITS V+ V 300 400 ANALOG SWITCH Fault-Free Analog Signal Range On-Resistance On-Resistance Match Between Channels NO_ Off-Leakage Current COM_ Off-Leakage Current COM_ On-Leakage Current 2 VNO_ (Notes 3, 4) RON VCOM_ = ±10V, INO_ = 0.2mA ∆RON INO_(OFF) +25°C E 500 VCOM_ = ±10V, INO_ = 0.2mA (Note 5) +25°C 15 E 20 VCOM_ = ±10V, VNO_ = ±10V (Note 6) +25°C -0.5 +0.5 E -5 +5 VCOM_ = ±10V, ICOM_(OFF) VNO_ = ±10V (Note 6) VCOM_ = ±10V, ICOM_(ON) VNO_ = ±10V, or floating (Note 6) MAX4708 MAX4709 MAX4708 MAX4709 +25°C -2 +2 E -20 +20 +25°C -1 +1 E -10 +10 +25°C -2 +2 E -25 +25 +25°C -1 +1 E -15 +15 _______________________________________________________________________________________ Ω Ω nA nA nA Fault-Protected, 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_ Power on -25 +25 -40 +40 +25°C -1 +1 E -10 +10 +25°C Power off VNO_ = ±25, VEN = 0 NO_ Input Leakage Current, Supplies On INO_ VNO_ = ±25V, VCOM_ = ±10V, VEN = 0 +25°C -1 +1 E -10 +10 NO_ Input Leakage Current, Supplies Off INO_ VNO_ = ±40V, VCOM = 0, V+ = 0, V- = 0 +25°C -1 +1 E -10 +10 E V- 0.4 V+ + 0.4 Fault-Trip Threshold V µA µA µA V ±Fault Output Turn-Off Delay RL = 10kΩ, VNO_ = ±25V +25°C 100 ns ±Fault Recovery Time RL = 10kΩ, VNO_ = ±25V +25°C 1.5 µs LOGIC INPUT (VEN, VA_) Logic Threshold High VIH Logic Threshold Low VIL Input Leakage Current IIN E 2.4 V E VA_ = 0.8V or 2.4V E -1 0.8 V +1 µA SWITCH DYNAMIC CHARACTERISTICS Enable Turn-On Time tON VNO_ = ±10V, RL = 1kΩ, CL = 35pF, Figure 3 (Note 7) +25°C Enable Turn-Off Time tOFF VNO_ = ±10V, RL = 1kΩ, CL = 35pF, Figure 3 (Note 7) +25°C tTRANS RL = 1kΩ, CL = 35pF, Figure 2 (Note 7) +25°C Settling Time tSETT VNO_ = 5V, RL = 1kΩ, CL = 35pF Break-Before-Make Time Delay tBBM VNO_ = ±10V, RL = 1kΩ, Figure 4 (Note 4) Transition Time Charge Injection Off-Isolation Q VISO 160 E 400 120 E 0.1% 170 350 500 1 E E 200 250 E 0.01% 275 2.5 10 ns ns ns µs 80 ns VNO_ = 0, RS = 0, CL = 1.0nF, Figure 5 +25°C 0 pC f = 1MHz, VNO_ = 1VRMS, RL = 75Ω, CL = 15pF, Figure 6 (Note 8) +25°C -70 dB _______________________________________________________________________________________ 3 MAX4708/MAX4709 ELECTRICAL CHARACTERISTICS—Dual Supplies (continued) MAX4708/MAX4709 Fault-Protected, 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 NO_ Off-Capacitance SYMBOL CONDITIONS TA VCT f = 1MHz, VNO_ = 1VRMS, RL = 75Ω, CL = 15pF, Figure 7 (Note 9) +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 MAX4708 MAX4709 MAX4708 MAX4709 MIN TYP MAX 19 +25°C pF 14 28 +25°C UNITS pF 22 POWER SUPPLY Power-Supply Range V+, V- E V+ Supply Current I+ All VA_= 0 or 5V, VNO_ = 0, VEN = 5V +25°C V- Supply Current I- All VA_ = 0 or 5V, VNO_ = 0, VEN = 5V +25°C IGND All VA_= 0 or 5V, VNO_ = 0, VEN = 5V +25°C GND Supply Current ±4.5 ±20.0 370 E 525 750 200 E 300 400 200 E 300 500 V µA 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 E -0.3 TYP MAX UNITS V+ V 630 950 ANALOG SWITCH Fault-Free Analog Signal Range On-Resistance On-Resistance Match Between Channels NO_ Off-Leakage Current COM_ Off-Leakage Current 4 VNO_ Power on or off (Note 3) +25°C RON VCOM_ = 10V, INO_ = 0.2mA ∆RON VCOM_ = 10V, INO_ = 0.2mA (Note 5) +25°C VCOM_ = 10V, 1V, VNO_ = 1V, 10V (Notes 6, 10) +25°C -0.5 E -10 INO_(OFF) VCOM_ = 10V, 1V, ICOM_(OFF) VNO_ = 1V, 10V (Notes 6, 10) MAX4708 MAX4709 E 1100 10 C, E 35 50 0.01 +0.5 +10 +25°C -2 +2 E -20 +20 +25°C -1 +1 E -10 +10 _______________________________________________________________________________________ Ω Ω nA nA Fault-Protected, 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 COM_ On-Leakage Current SYMBOL CONDITIONS VCOM_ = 10V, 1V; ICOM_(ON) VNO_ = 10V, 1V, or floating (Notes 6, 10) MAX4708 MAX4709 TA MIN +25°C -2 TYP MAX +2 E -25 +25 +25°C -1 +1 E -15 +15 UNITS nA FAULT PROTECTION Fault-Protected Analog Signal Range (Notes 3, 10) VNO_ COM_ Output Leakage Current, Supplies On ICOM_ Power on E Power off -36 +36 -40 +40 VNO_ = ±36V, V+ = 12V (Notes 3, 10) +25°C -1 +1 E -10 +10 NO_ Input Leakage Current, Supplies On INO_ VNO_ = ±36V, VCOM_ = 0, V+ = 12V (Notes 3, 10) +25°C -1 +1 E -10 +10 NO_ Input Leakage Current, Supply Off INO_ VNO_ = ±40V, V+ = 0, V- = 0 (Notes 3, 10) +25°C -1 +1 E -10 +10 E 2.4 V µA µA µA LOGIC INPUT (VEN, VA_) Logic Threshold High VIH Logic Threshold Low VIL Input Leakage Current IIN V E VA_ = 0.8V or 2.4V E -1 0.8 V 0.03 +1 µA 240 500 SWITCH-DYNAMIC CHARACTERISTICS Enable Turn-On Time tON VCOM_ = 10V, RL = 2kΩ, CL = 35pF, Figure 3 (Note 7) +25°C Enable Turn-Off Time tOFF VCOM_ = 10V, RL = 2kΩ, CL = 35pF, Figure 3 (Note 7) +25°C RL = 2kΩ, CL = 35pF, Figure 2 (Note 7) +25°C Transition Time tTRANS 0.1% E 100 E tSETT VNO_ = 5V, RL = 1kΩ, CL = 35pF Break-Before-Make Time Delay tBBM VCOM_ = 10V, RL = 2kΩ, Figure 4 (Note 4) +25°C VNO_ = 0, RS = 0, CL = 1.0 nF, Figure 5 250 350 180 E Settling Time 0.01% 700 400 600 1 E 2.5 ns ns µs 100 ns +25°C 2 pC f = 1MHz, VNO_ = 0, Figure 8 +25°C 5 pF COM_ Off-Capacitance CCOM_(OFF) f = 1MHz, VNO_ = 0, Figure 8 +25°C 5 pF COM_ On-Capacitance f = 1MHz, VCOM_ = VNO_ = 0, CCOM_(ON) Figure 8 +25°C 28 pF Charge Injection Q NO_ Off-Capacitance CNO_(OFF) 50 ns _______________________________________________________________________________________ 5 MAX4708/MAX4709 ELECTRICAL CHARACTERISTICS—Single +12V Supply (continued) 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 Off-Isolation VISO f = 1MHz, VNO_ = 1VRMS, RL = 75Ω, CL = 15pF, Figure 6 (Note 8) +25°C -70 dB Channel-to-Channel Crosstalk VCT f = 1MHz, VNO_ = 1VRMS, RL = 75Ω, CL = 15pF, Figure 7 (Note 9) +25°C -62 dB TA MIN TYP MAX UNITS POWER SUPPLY Power-Supply Range V+ E V+ Supply Current I+ 9 36 +25°C All VA_ = VEN = 5V, VNO_ = 0 180 300 112 250 E V 450 All VA_ = 0 or V+, VNO_ = 0, VEN = +25°C 0 or V+ E µA 375 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 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 and not production tested. 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: Dynamic testing is 100% functionally tested on the ATE system and correlated with the initial design characterization per Figures 2 and 3. Note 8: Off-Isolation = 20 ✕ log10 (VCOM_ / VNO_), where VCOM_ = output and VNO_ = input to open switch. Note 9: Between any two analog inputs. Note 10: Guaranteed by testing with dual supplies. Typical Operating Characteristics (V+ = +15V, V- = -15V, VEN = +2.4V, TA = +25°C, unless otherwise noted.) ON-RESISTANCE vs. VCOM (SINGLE SUPPLY) V+ = +15V V- = -15V 400 600 V+ = +20V V- = 0V V+ = +15V V- = -15V TA = +125°C 500 TA = +70°C TA = +85°C 400 V+ = +30V V- = 0V 400 600 RON (Ω) 600 800 RON (Ω) V+ = +10V V- = -10V V+ = +9V V- = 0V V+ = +12V V- = 0V V+ = +15V V- = 0V MAX4708/09 toc02 V+ = +4.5V V- = -4.5V 800 1000 MAX4708/09 toc01 1000 ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES) MAX4708/09 toc03 ON-RESISTANCE vs. VCOM (DUAL SUPPLIES) RON (Ω) MAX4708/MAX4709 Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers 300 200 200 200 0 0 -20 -15 -10 -5 0 VCOM (V) 6 100 V+ = +36V V- = 0V V+ = +20V V- = -20V 5 10 15 20 TA = +25°C 0 6 12 18 VCOM (V) 24 30 36 TA = -55°C TA = -40°C 0 -15 -10 -5 0 VCOM (V) _______________________________________________________________________________________ 5 10 15 Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY) 600 400 200 TA = +25°C INO_OFF 10 2 4 6 MAX4708/09 toc06 MAX4708/09 toc05 ICOM_ON 5 DUAL SUPPLIES: ±15V 0 SINGLE SUPPLY: +12V ICOM_OFF -5 1 -10 0.1 0 8 12 10 -40 -15 35 10 60 -15 85 -10 -5 0 5 10 TEMPERATURE (°C) VCOM (V) ENABLE TURN-ON/OFF TIMES vs. SUPPLY VOLTAGE (DUAL SUPPLIES) ENABLE TURN-ON/OFF TIMES vs. SUPPLY VOLTAGE (SINGLE SUPPLY) ENABLE ON/OFF TIMES vs. TEMPERATURE tON 200 tOFF 100 0 MAX4708/09 toc08 200 tON 150 300 tOFF 5 10 tON 150 100 50 50 20 15 200 100 tOFF 0 0 0 V+ = +15V V- = -15V 250 tON/tOFF (ns) 300 V- = GND, VNO_ = +10V 250 tON/tOFF (ns) 400 300 MAX4708/09 toc07 VNO_ = ±10V 9 18 -40 36 27 -15 10 35 85 60 SUPPLY VOLTAGE (V+) TEMPERATURE (°C) SUPPLY CURRENT vs. TEMPERATURE (VA_ = 0) SUPPLY CURRENT vs. TEMPERATURE (VA_ = +5V) LOGIC-LEVEL THRESHOLD VOLTAGE vs. SUPPLY VOLTAGE 100 0 IGND -100 -200 I- -300 I+ 300 200 100 0 IGND -100 -500 SINGLE SUPPLY 1.5 1.0 -400 10 DUAL SUPPLIES 2.0 I- -300 -15 2.5 -200 -400 -40 MAX4708/09 toc12 400 3.0 THRESHOLD VOLTAGE (V) 200 V+ = +15V, V- = -15V, VA_ = +5V 500 SUPPLY CURRENT (µA) I+ 300 600 MAX4708/09 toc10 V+ = +15V, V- = -15V, VA_ = 0 400 MAX4708/09 toc11 SUPPLY VOLTAGE (V+, V-) 500 15 MAX4708/09 toc09 VCOM (V) 500 tON/tOFF (ns) 100 10 TA = -55°C TA = -40°C 0 SUPPLY CURRENT (µA) V+ = +15V, V- = -15V, VCOM = 10V, VNO = ±10V Q (pC) LEAKAGE CURRENT (pA) RON (Ω) 800 CHARGE INJECTION vs. VCOM LEAKAGE CURRENT vs. TEMPERATURE 1000 MAX4708/09 toc04 V+ = +12V TA = +125°C V- = 0V TA = +70°C TA = +85°C ± 1000 35 TEMPERATURE (°C) 60 85 -40 -15 10 35 TEMPERATURE (°C) 60 85 0 5 10 15 20 25 30 35 40 SUPPLY VOLTAGE (V) _______________________________________________________________________________________ 7 MAX4708/MAX4709 Typical Operating Characteristics (continued) (V+ = +15V, V- = -15V, VEN = +2.4V, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (V+ = +15V, V- = -15V, VEN = +2.4V, TA = +25°C, unless otherwise noted.) FAULT CURRENT vs. FAULT VOLTAGE (DUAL SUPPLIES) 100 ICOM (µA) -20 -40 CROSSTALK 200 50 150 0 -50 MAX4708/09 toc15 BANDWIDTH 150 V+ = +15V V- = -15V V+ = +12V V- = GND 100 ICOM (µA) V+ = +15V V- = -15V 0 200 MAX4708/09 toc13 20 FAULT CURRENT vs. FAULT VOLTAGE (SINGLE SUPPLY) MAX4708/09 toc14 FREQUENCY RESPONSE LOSS (dB) MAX4708/MAX4709 Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers 50 0 -50 OFF-ISOLATION -60 -100 -80 -100 FOR |VCOM| < VSUPPLY, ICOM = VCOM / RL -150 -200 -100 0.001 0.01 0.1 1 10 100 1000 -200 -80 -60 -40 -20 0 20 40 60 -80 VCOM (V) FREQUENCY (MHz) INPUT OVERVOLTAGE vs. OUTPUT VOLTAGE FOR 0V < VCOM < VSUPPLY, ICOM = VCOM / RL -150 -60 -40 -20 0 20 INPUT OVERVOLTAGE vs. OUTPUT VOLTAGE 60 80 FAULT RECOVERY TIME (POSITIVE INPUT) MAX4708/09 toc17 MAX4708/09 toc16 40 VCOM (V) MAX4708/09 toc18 VNO_ INPUT 10V/div GND GND VNO_ INPUT 10V/div VCOM_ OUTPUT 10V/div VNO_ INPUT 10V/div VCOM_ OUTPUT 5V/div GND GND GND GND VCOM_ OUTPUT 200mV/div 200µs 4.00µs FAULT RECOVERY TIME (NEGATIVE INPUT) FAULT RESPONSE TIME (POSITIVE INPUT) MAX4708/09 toc19 MAX4708/09 toc21 GND VNO_ INPUT 10V/div VNO_ INPUT 10V/div VNO_ INPUT 10V/div GND GND VCOM_ OUTPUT 5V/div VCOM_ OUTPUT 5V/div GND VCOM_ OUTPUT 5V/div 8 FAULT RESPONSE TIME (NEGATIVE INPUT) MAX4708/09 toc20 GND 1.00µs 1.00µs GND 100ns/div 100ns/div _______________________________________________________________________________________ Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers MAX4708 (Single 8-to-1 Mux) PIN NAME MAX4709 (Dual 4-to-1 Mux) PIN FUNCTION NAME FUNCTION 1 A0 Address Bit 0 1 A0 Address Bit 0 2 EN Mux Enable 2 EN Mux Enable 3 V- Negative Supply Voltage. Bypass to GND with a 0.1µF capacitor. 3 V- Negative Supply Voltage. Bypass to GND with a 0.1µF capacitor. 4 NO1 Channel Input 1 4 NO1A Channel Input 1A 5 NO2 Channel Input 2 5 NO2A Channel Input 2A 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 COMB Mux Output B 6 9 NO8 Channel Input 8 9 10 NO7 Channel Input 7 10 NO4B Channel Input 4B 11 NO6 Channel Input 6 11 NO3B Channel Input 3B Channel Input 5 12 NO2B Channel Input 2B Positive Supply Voltage. Bypass to GND with a 0.1µF capacitor. 13 NO1B 12 NO5 13 V+ 14 GND 15 A2 16 A1 14 V+ Address Bit 2 15 GND Address Bit 1 16 A1 Ground Channel Input 1B Positive Supply Voltage. Bypass to GND with a 0.1µF capacitor. Ground Address Bit 1 Truth Tables MAX4708 (Single 8-to-1 Mux) MAX4709 (Dual 4-to-1 Mux) A2 A1 A0 EN ON SWITCH A1 A0 EN COMA COMB X X X 0 None X X 0 None None 0 0 0 1 NO1 0 0 1 NO1A NO1B 0 0 1 1 NO2 0 1 1 NO2A NO2B 0 1 0 1 NO3 1 0 1 NO3A NO3B 0 1 1 1 NO4 1 1 1 NO4A NO4B 1 0 0 1 NO5 1 0 1 1 NO6 1 1 0 1 NO7 1 1 1 1 NO8 X = Don’t care. _______________________________________________________________________________________ 9 MAX4708/MAX4709 Pin Descriptions MAX4708/MAX4709 Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers Detailed Description Several unique features differentiate the MAX4708/ MAX4709 from traditional fault-protected multiplexers. First, instead of the three series FETs utilized in older designs, the MAX4708/MAX4709 design employs two parallel FETs for lower on-resistance and improved flatness. Second, older devices limited the range of signal amplitudes the switch could pass by as much as 3V below the supply rails. The MAX4708/MAX4709 feature rail-to-rail signal handling that allows the devices to transmit signals with amplitudes at or slightly beyond the supply rails. Finally, in former designs (MAX4508/ MAX4509), when a fault occurred, the devices clamped and held the output voltage at the appropriate supply rail until the fault was removed. Instead, the MAX4708/MAX4709 now disconnect COM_ from NO_ during a fault condition, making COM_ a high-impedance output as long as the fault is present. Operation is identical for both positive and negative fault polarities. When the NO_ voltage ranges beyond supply rails (fault condition), the NO_ input becomes high impedance, regardless of the switch state or load resistance. If power is removed, and the fault voltage is still present, the NO_ terminals remain high impedance. The fault voltage can be up to ±40V, with V+ = V- = 0. The COM_ pins are not fault protected. Limit any voltage sources connected to COM_ to the supply rails. Figure 1 shows the internal construction of a single normally open (NO) switch, with the analog signal paths shown in bold. The parallel combination of N-channel FET N1 and P-channel FET P1 form the analog switch. During normal operation, these FETs are driven on and off simultaneously according to the control voltages on A_. During a fault condition, both FETs turn off. NO_ Input Voltage The maximum allowable input voltage for safe operation depends on whether supplies are on or off, and the load configuration on COM_. If COM_ is referred to a voltage other than ground, but within the supplies, VNO_ can range higher or lower than the supplies, provided the absolute value of |VNO_ - VCOM_| is less than 40V. For example, with V+ = V- = 0, if the load is referred to +10V at COM_, then the NO_ voltage range can be from +50V to -30V. If the supplies are ±15V and COM_ is referenced to ground through a load, the maximum NO_ voltage is ±36V. If the supplies are off and the COM output is referenced to ground, the maximum NO_ voltage is ±40V. 10 Normal Operation Two comparators continuously compare the voltage on NO_ with V+ and V- supply voltages. When the signal on NO_ ranges between V+ and V-, the multiplexer operates normally, with FETs N1 and P1 turning on and off in response to the control signals on A_ (Figure 1). When the switch state is on, 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. When the switch state is off, both NO_ and COM_ are high-impedance inputs. Fault Conditions A fault condition occurs when the voltage at any NO_ input exceeds the supply rail. At this point, the output of one of the two fault comparators goes high, effectively turning OFF both FETs N1 and P1. With the two FETs in the OFF position, both the switch input (NO_) and the output (COM_) go into a high-impedance state. They remain high impedance regardless of the state of the control voltages in A_ and EN, until the fault is removed. The input voltage must not exceed the absolute maximum rating at any moment (see the Absolute Maximum Ratings section). Transient Fault Condition When a fast rising or falling transient on NO_ exceeds V+ or V-, there is a 100ns delay before the fault protection turns on (see the Typical Operating Characteristics, Fault Response Time). COM_ follows NO_ until the fault protection turns on. This delay is due to the switch on-resistance and circuit capacitance to ground. When the input transient returns to within the supply rails, there is a longer output recovery time (see the Typical Operating Characteristics, Fault Response Times). These values depend on the COM_ output resistance and capacitance. Higher COM_ output resistance and capacitance increase the recovery times. The delays do not depend on the fault amplitude. COM and A_ The GND, COM_, and A_ pins are not fault protected. ESD-protection diodes internally connect A_ to both V+ and V-. If a signal on GND, COM_, or A_ exceeds V+ or V- by more than 300mV, excessive current can flow to or from the supplies, possibly damaging the device. Logic-Level Thresholds The logic-level thresholds are CMOS and TTL compatible with V+ = +15V and V- = -15V. Logic levels change as V+ increases (see the Typical Operating Characteristics, Logic-Level Threshold Voltage vs. Supply Voltage.) ______________________________________________________________________________________ Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers Chip Information Ground V+ and GND power the internal logic and logic-level translators. The logic-level translators convert the logic-level inputs to V+ and V- to drive the gates of the internal FETs. In this design, there is no galvanic connection inside the MAX4708/MAX4709 between the analog signal paths and GND. ESD-protection diodes connect A_ to V+ and V-. Supply Current Reduction TRANSISTOR COUNT: 527 SUBSTRATE INTERNALLY CONNECTED TO V+ Package Information For the latest package outline information, go to www.maxim-ic.com/packages. Driving the logic signals rail-to-rail from 0 to +15V or -15V to +15V reduces the current consumption from 370µA (typ) to 200µA (typ) (see the Electrical Characteristics table, Power Supplies). Power Supplies The MAX4708/MAX4709 operate with bipolar supplies between ±4.5V and ±20V. The V+ and V- supplies need not be symmetrical, but V+ - V- cannot exceed the 44V absolute maximum rating. The MAX4708/MAX4709 operate from single supplies between +9V and +36V when V- is connected to GND. Pin Configurations/Functional Diagrams (continued) NORMALLY OPEN SWITCH CONSTRUCTION V+ HIGH FAULT P1 NO_ COM_ N1 LOW FAULT ON A_ MAX4708 MAX4709 GND VESD DIODES Figure 1. Functional Diagram ______________________________________________________________________________________ 11 MAX4708/MAX4709 Applications Information Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers MAX4708/MAX4709 Test Circuits/Timing Diagrams V+ NO1 A2 A1 +10V NO2–NO7 A0 MAX4708 +2.4V NO8 EN -10V COM GND VOUT V- CL 50Ω LOGIC INPUT VA_ RL tR < 20ns tF < 20ns +3V 50% 0V VNO1 SWITCH OUTPUT VOUT V+ NO1B A1 +10V 90% 0V 90% A0 VNO8 NO1A–NO4A +2.4V NO4B MAX4709 EN -10V GND tTRANS tTRANS COMB V- ON VOUT CL 50Ω RL Figure 2. Address Transition Time VEN V+ EN NO1 +10V NO2–NO8 A0 A1 MAX4708 A2 COM GND 50Ω VOUT V- CL RL LOGIC INPUT VEN +3V 50% 0V tON(EN) 0V VEN V+ EN 50Ω tOFF(EN) 90% SWITCH OUTPUT VOUT +10V NO1A–NO4A NO2B–NO4B, COMA A0 A1 NO1B 10% MAX4709 GND COMB V- VOUT RL CL Figure 3. Enable Switching Time 12 tR < 20ns tF < 20ns ______________________________________________________________________________________ Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers VEN +2.4V V+ EN NO1–NO8 A0 LOGIC INPUT VA +10V MAX4708 50% 0V +5V A1 VA tR < 20ns tF < 20ns +3V 80% A2 COM GND SWITCH OUTPUT VOUT VOUT V- 35pF tOPEN 0V 1kΩ 50Ω Figure 4. Break-Before-Make Interval RS NO VEN VS A0 CHANNEL SELECT V+ LOGIC INPUT VEN EN MAX4708 COM +3V OFF ON OFF 0V VOUT A1 A2 ∆VOUT 1nF GND VOUT V- ∆VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR VCTE WHEN THE CHANNEL TURNS OFF. VCTE = ∆VOUT X CL Figure 5. Charge Injection 10nF NO1 VIN RS = 50Ω 10nF V+ NO1 NO8 R 1kΩ MAX4708 COM A0 VOUT GND EN V- RL 75Ω MAX4708 COM A1 A2 10nF GND EN V- VOUT RL 75Ω 10nF OFF-ISOLATION = 20log Figure 6. Off-Isolation NO8 A0 RG = 50Ω A1 A2 VIN V+ NO2 VOUT CROSSTALK = 20log VIN VOUT VIN Figure 7. Crosstalk ______________________________________________________________________________________ 13 MAX4708/MAX4709 Test Circuits/Timing Diagrams (continued) MAX4708/MAX4709 Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers Test Circuits/Timing Diagrams (continued) V+ A2 CHANNEL SELECT A1 A0 V- EN +25V VCOM_ +15V 1MHz CAPACITANCE ANALYZER NO8 MAX4708 GND VNO_ NO1 COM -15V f = 1MHz -25V Figure 8. NO_, COM_ Capacitance Figure 9. Transient Behavior of Fault Condition Functional Diagrams/Truth Tables MAX4708 V+ V- GND MAX4708 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 MAX4709 A1 A2 V+ EN V- LOGIC 0 VAL ≤ +0.8V, LOGIC 1 VAH ≥ +2.4V GND NO1A NO2A NO3A MAX4709 COMA NO4A NO1B COMB NO2B NO3B NO4B A1 A0 EN ON SWITCH X X 0 NONE 0 0 1 1 0 1 1 2 1 0 1 3 1 1 1 4 DECODERS/DRIVERS LOGIC 0 VAL ≤ +0.8V, LOGIC 1 VAH ≥ +2.4V A0 A1 EN 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. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.