ON SWITCH NONE COM-NO0 COM-NO1 COM-NO2 COM-NO3 ADDA ADDB X = DON T CARE N.C. = NO CONNECT

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1 9-224; Rev ; /8 Low-Voltage, 6, 4: Analog Multiplexer in QFN General Description The MAX474 low-voltage, 4-channel analog multiplexer operates from a single +.8V to +.V supply. The MAX474 features break-before-make switching action with a t ON = 6 and t OFF = 2 at +3V. When powered from a +2.7V supply, the device has a 6 (max) on-resistance (R ON ), with 3 (max) R ON matching and max R ON flatness. The digital logic inputs are.8v-logic compatible from a +2.7V to +3.3V supply. The MAX474 is available in both a space-saving 2-pin QFN (3mm x 3mm) package and a -pin µmax package. Applicatio MP3 Players Battery-Operated Equipment Relay Replacement Audio and Video Signal Routing Low-Voltage Data-Acquisition Systems Communicatio Circuits PCMCIA Cards Cellular Phones Modems Features 3mm x 3mm 2-Pin QFN Package Guaranteed On-Resistance: 6 (max) (+2.7V Supply) 4 (max) (+V Supply) Guaranteed Match Between Channels: 3 (max) Guaranteed Flatness Over Signal Range: (max) Guaranteed Low Leakage Currents: pa (max) at +2 C Switching Time: t ON = 6, t OFF = 2 +.8V to +.V Single-Supply Operation Rail-to-Rail Signal Handling -3dB Bandwidth: >2MHz Low Crosstalk: -9dB (MHz) High Off-Isolation: -8dB (MHz) Low 3pC Charge Injection THD:.2% +.8V CMOS-Logic Compatible MAX474 Ordering Information PART TEMP. RANGE PIN-PACKAGE MAX474EGC -4 C to +8 C 2 QFN-EP* MAX474EUB -4 C to +8 C µmax *EP = Exposed Pad Pin Configuratio TOP VIEW MAX474 MAX474 2 NO NO2 NO3 NO LOGIC NO X X ON SWITCH NONE -NO -NO -NO2 -NO3 N.C. NO2 2 3 LOGIC 9 8 N.C. 7 μmax X = DON T CARE N.C. = NO CONNECT 4 NO3 NO QFN 6 Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at , or visit Maxim s website at

2 Low-Voltage, 6, 4: Analog Multiplexer in QFN MAX474 ABSOLUTE MAXIMUM RATINGS (Voltages Referenced to )...-.3V to +6V All Other Pi (Note ) V to ( +.3V) Continuous Current, NO_...±2mA Peak Current, NO_ (pulsed at ms, % duty cycle)...±4ma ESD per Method >2kV Continuous Power Dissipation (T A = +7 C) -Pin µmax (derate 4.7mW/ C above +7 C)... 33mW 2-Pin QFN (derate.9mw/ C above +7 C)... 92mW Operating Temperature Range C to +8 C Storage Temperature Range C to + C Lead Temperature (soldering, s) C Note : Signals on, ADD_, NO_, and exceeding or 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 conditio beyond those indicated in the operational sectio of the specificatio is not implied. Exposure to absolute maximum rating conditio for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS Single +3V Supply ( = +2.7V to +3.3V, V IH = +.4V, V IL = +.V, T A = -4 C to +8 C, unless otherwise noted. Typical values are at = +3V and T A = +2 C.) (Notes 2, 3) PARAMETER SYMBOL CONDITIONS T A MIN TYP MAX UNITS ANALOG SWITCH Analog Signal Range V, V NO_ V = +2.7V, I +2 C 6 On-Resistance R = ma, ON V NO_ = +.3V T MIN to T MAX 7 On-Resistance Match Between Channels (Note 4) On-Resistance Flatness (Note ) NO_ Off-Leakage Current (Note 6) ΔR ON R FLAT (ON) = +2.7V, I = ma, +2 C 3 V NO_ = +.3V T MIN to T MAX = +2.7V, I = ma, +2 C 3 V NO_ = +V, +.3V, +.8V T MIN to T MAX = +3.3V, V +2 C -. ±.. I = +.3V, +3V N O_ ( OFF ) V NO_ = +3V, +.3V T MIN to T MAX - On-Leakage Current (Note 6) V + = + 3.3V, V +2 C -. ±.. I C OM = +.3V, +3V C OM ( ON ) V N O_ = +.3V, + 3V, or fl oati ng T MIN to T MAX - Off-Leakage Current (Note 6) DYNAMIC = +3.3V, V +2 C -. ±.. I = +.3V, +3V C OM ( OFF ) V NO_ = +3V, +.3V T MIN to T MAX - V N O_ = +.V, R L = 3, +2 C 2 6 Address Traition Time t TRANS C L = 3pF, Figure 2 T MIN to T MAX 7 V +2 C 2 6 Inhibit Turn-On Time t N O _ = +.V, R L = 3, ON C L = 3pF, Figure 3 T MIN to T MAX 7 V +2 C 2 Inhibit Turn-Off Time t N O _ = +.V, R L = 3, OFF C L = 3pF, Figure 3 T MIN to T MAX 3 Break-Before-Make Time (Note 7) V +2 C 2 t N O _ = +.V, R L = 3, BBM C L = 3pF, Figure 4 T MIN to T MAX 2 Charge Injection Q V GEN =, R GEN =, C L =.nf, Figure 2 pc 2

3 Low-Voltage, 6, 4: Analog Multiplexer in QFN ELECTRICAL CHARACTERISTICS Single +3V Supply (continued) ( = +2.7V to +3.3V, V IH = +.4V, V IL = +.V, T A = -4 C to +8 C, unless otherwise noted. Typical values are at = +3V and T A = +2 C.) (Notes 2, 3) PARAMETER SYMBOL CONDITIONS T A MIN TYP MAX UNITS On-Channel -3dB Bandwidth BW Signal = dbm, in and out, Off-Isolation (Note 8) V ISO f = MHz, R L =, C L = pf, Crosstalk (Note 9) V CT f = MHz, R L =, C L = pf, >2 MHz -8 db -9 db MAX474 NO_ Off-Capacitance C N O_ ( OFF) f = MHz, V N O _ =, Figure 7 7 pf On-Capacitance C (ON) f = MHz, V N O _ =, Figure 7 9 pf Off-Capacitance C (OFF) f = MHz, V N O _ =, Figure 7 pf DIGITAL I/O Input Logic High V IH.4 V Input Logic Low V IL. V Input Leakage Current I IH, I IL ADD_, = or - µa SUPPLY Power-Supply Range.8. V Power-Supply Current I+ = +.V, ADD_, = or µa ELECTRICAL CHARACTERISTICS Single +V Supply ( = +4.V to +.V, V IH = +2.V, V IL = +.8V, T A = -4 C to +8 C, unless otherwise noted. Typical values are at = +V and T A = +2 C.) (Notes 2, 3) PARAMETER SYMBOL CONDITIONS T A MIN TYP MAX UNITS ANALOG SWITCH Analog Signal Range V, V NO_ V = +4.V, I +2 C 3 4 On-Resistance R = ma, ON V NO_ = +3.V T MIN to T MAX On-Resistance Match Between Channels (Note 4) On-Resistance Flatness (Note ) NO_ Off-Leakage Current (Note 6) On-Leakage Current (Note 6) ΔR ON R FLAT (ON) = +4.V, I = ma, +2 C 2 V NO_ = +3.V T MIN to T MAX 3 = +4.V, I = ma, +2 C 3 V NO_ = +V, +2.2V, +3.V T MIN to T MAX = +.V, V +2 C -. ±.. I = +.V, +V N O_ ( OFF ) V NO_ = +V, +.V T MIN to T MAX - V + = +.V, V +2 C -. ±.. I C OM = +.V, +V C OM ( ON ) V N O_ = +.V, +V, or fl oati ng T MIN to T MAX - 3

4 Low-Voltage, 6, 4: Analog Multiplexer in QFN MAX474 ELECTRICAL CHARACTERISTICS Single +V Supply (continued) ( = +4.V to +.V, V IH = +2.V, V IL = +.8V, T A = -4 C to +8 C, unless otherwise noted. Typical values are at = +V and T A = +2 C.) (Notes 2, 3) PARAMETER SYMBOL CONDITIONS T A MIN TYP MAX UNITS = +.V, V _ = +.V, +V +2 C -. ±.. Off-Leakage Current I C OM ( OFF ) V NO_ = +V, +.V T MIN to T MAX - DYNAMIC V N O_ = +3V, R L = 3, +2 C 3 Address Traition Time t TRANS C L = 3pF, Figure 2 T MIN to T MAX 4 V +2 C 8 3 Inhibit Turn-On Time t N O_ = +3V, R L = 3, ON C L = 3pF, Figure 3 T MIN to T MAX 4 V +2 C 9 2 Inhibit Turn-Off Time t N O_ = +3V, R L = 3, OFF C L = 3pF, Figure 3 T MIN to T MAX 3 Break-Before-Make Time (Note 7) V +2 C 2 t N O_ = +3V, R L = 3, BBM C L = 3pF, Figure 4 T MIN to T MAX 2 Charge Injection Q V GEN =, R GEN =, C L =.nf, Figure 3 pc On-Channel -3dB Bandwidth BW Signal = dbm, in and out, >2 MHz Off-Isolation (Note 8) V ISO f = MHz, R L =, C L = pf, Crosstalk (Note 9) V CT f = MHz, R L =, C L = pf, -8 db -9 db Total Harmonic Distortion THD f = 2Hz to 2kHz, Vp-p, R L = 6.2 % DIGITAL I/O Input Logic High V IH 2. V Input Logic Low V IL.8 V Input Leakage Current I IH, I IL ADD_, = or - µa SUPPLY Power-Supply Range.8. V Positive Supply Current I+ = +.V, ADD_, = or µa Note 2: The algebraic convention, where the most negative value is a minimum and the most positive value a maximum, is used in this data sheet. Note 3: -4 C specificatio are guaranteed by design. Note 4: ΔR ON = R ON(MAX) - R ON(MIN). Note : Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal ranges. Note 6: Leakage currents are % tested at T A = +8 C. Limits across the full temperature range are guaranteed by correlation. Note 7: Guaranteed by design. Note 8: Off-Isolation = 2log (V / V NO_ ), V = output, V NO_ = input to off switch. Note 9: Between any two switches. 4

5 Low-Voltage, 6, 4: Analog Multiplexer in QFN (T A = +2 C, unless otherwise noted.) RON () ON-RESISTANCE VS. V =.8V 6 = 2.V 4 = 3.V 3 =.V 2 MAX474 toc RON () ON-RESISTANCE VS. V ( = 3V) T A = +8 C T A = +2 C T A = -4 C Typical Operating Characteristics MAX474 toc2 RON () ON-RESISTANCE VS. V ( = V) 2 2 T A = +8 C T A = +2 C T A = -4 C MAX474 toc3 MAX V (V) V (V) V (V) SUPPLY CURRENT () SUPPLY CURRENT VS. TEMPERATURE V = = +V MAX474 toc4 SUPPLY CURRENT (μa) SUPPLY CURRENT VS. LOGIC INPUT VOLTAGE = +3V = +V MAX474 toc ON-LEAKAGE (pa) ON-LEAKAGE CURRENT vs. TEMPERATURE = V = 3V MAX474 toc6 = +3V TEMPERATURE ( C) (V) V = TEMPERATURE ( C) OFF-LEAKAGE (pa) OFF-LEAKAGE CURRENT vs. TEMPERATURE OFF, = V OFF, = 3V NO_ OFF, = V MAX474 toc7 LOGIC THRESHOLD ADD_ (V) LOGIC THRESHOLD VS. SUPPLY VOLTAGE V IH V IL MAX474 toc8 IBIT TIME () IBIT TURN-ON/OFF TIME vs. SUPPLY VOLTAGE t OFF t ON MAX474 toc9.2 NO_ OFF, = 3V TEMPERATURE ( C) (V) SUPPLY VOLTAGE (V)

6 Low-Voltage, 6, 4: Analog Multiplexer in QFN MAX474 (T A = +2 C, unless otherwise noted.) IBIT TIME () 2 2 IBIT TURN-ON/OFF TIME vs. TEMPERATURE t ON, = 3V t ON, = V t OFF, = 3V t OFF, = V TEMPERATURE ( C) MAX474 toc Q (pc) Typical Operating Characteristics (continued) CHARGE INJECTION vs. V = V 3 2 = 3V MAX474 toc LOSS (db) FREQUENCY RESPONSE ON-RESPONSE OFF-ISOLATION -8 CROSSTALK V (V) FREQUENCY (MHz) MAX474 toc2 THD (%) THD vs. FREQUENCY Vp-p = V R IN = R OUT = 6. k k k FREQUENCY (Hz) = V MAX474 toc3 ADDRESS TRANSITION TIME () ADDRESS TRANSITION TIME vs. SUPPLY VOLTAGE t LH t HL SUPPLY VOLTAGE (V) MAX474 toc4 ADDRESS TRANSITION TIME () 2 2 ADDRESS TRANSITION TIME vs. TEMPERATURE t LH, = 3V t LH, = V t HL, = 3V t HL, = V TEMPERATURE ( C) MAX474 toc 6

7 Low-Voltage, 6, 4: Analog Multiplexer in QFN µmax PIN QFN-EP NAME Positive Supply Voltage 2, 8 N.C. No Connection. Not internally connected. 3 NO2 Analog Switch 2. Normally open. 2 4 NO3 Analog Switch 3. Normally open. 3 NO Analog Switch. Normally open. FUNCTION Pin Description 4 6 Inhibit. Connect to for normal operation. Connect to logic-level high to turn all switches off. 7 Ground 6 9 Address Decoder Selection B 7 Address Decoder Selection A 8 NO Analog Switch. Normally open. 9 2 Analog Switch Common Terminal EP Exposed Pad. Internally connected to. Connect to a large ground plane to maximize thermal performance; not intended as an electrical connection point (QFN package only). MAX474 Detailed Description The MAX474 low-voltage, 4-channel analog multiplexer operates from a single +.8V to +.V supply. When powered from a +2.7V supply, the device has a 6 (max) on-resistance (R ON ), with 3 (max) R ON matching and (max) R ON flatness. The digital logic inputs are +.8V-logic compatible from a +2.7V to +3.3V supply. Applicatio Information Digital Control Inputs The MAX474 logic inputs are +.8V CMOS logic compatible for 3V operation and TTL compatible for V operation of. Driving ADD_ rail-to-rail minimizes power coumption. Analog Signal Levels Analog signals that range over the entire supply voltage ( to ) are passed with very little change in on-resistance (see Typical Operating Characteristics). The switches are bidirectional, so the NO_ and pi can be either inputs or outputs. (D) as shown in Figure. If the analog signal can dip below, add D2. Adding protection diodes reduces the analog range to a diode drop (about.7v) below (for D), and a diode drop above ground (for D2). On-resistance increases slightly at low supply voltages. Maximum supply voltage () must not exceed +6V. Adding protection diode D2 causes the logic threshold to be shifted relative to. TTL compatibility is not guaranteed when D2 is added. Protection diodes D and D2 also protect agait some overvoltage situatio. In the circuit in Figure, if the supply voltage is below the absolute maximum rating, and if a fault voltage up to the absolute maximum rating is applied to an analog signal pin, no damage will result. POSITIVE SUPPLY D MAX474 Power-Supply Sequencing and Overvoltage Protection Caution: Do not exceed the absolute maximum ratings because stresses beyond those listed may cause permanent damage to devices. Proper power-supply sequencing is recommended for all CMOS devices. Always apply before applying analog signals, especially if the analog signal is not current limited. If this sequencing is not possible, and if the analog inputs are not current limited to <2mA, add a small-signal diode 7 V g NO D2 Figure. Overvoltage Protection Using Two External Blocking Diodes

8 Low-Voltage, 6, 4: Analog Multiplexer in QFN MAX474 V ADD NO NO NO2 MAX474 NO3 V NO_ Test Circuits/Timing Diagrams V ADD % V NO 9% 9% 3 3pF t TRANS t TRANS Figure 2. Address Traition Time NO NO NO3 V NO_ V V NO % MAX474 9% 9% V 3 3pF t OFF t ON Figure 3. Inhibit Switching Times V ADD NO N3 V NO_ V ADD % t R < t F < MAX pF V 9% t BBM Figure 4. Break-Before-Make Interval 8

9 Low-Voltage, 6, 4: Analog Multiplexer in QFN CHANNEL SELECT V NO_ MAX474 V NO = Test Circuits/Timing Diagrams (continued) CL pf V Δ MAX474 Δ IS THE MEASURED VOLTAGE DUE TO CHARGE- TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. REPEAT TEST FOR EACH SECTION. Q = Δ X C L Figure. Charge Injection CHANNEL SELECT nf NO_ MAX474 VIN VOUT NETWORK ANALYZER MEAS. REF. OFF-ISOLATION = 2log ON-LOSS = 2log CROSSTALK = 2log V IN V IN V IN MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT SOCKET TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN AND "OFF" NO TERMINAL ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN AND "ON" NO TERMINAL ON EACH SWITCH. CROSSTALK IS MEASURED FROM ONE CHANNEL (A, B) TO OTHER CHANNEL. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.. Off-Isolation, On-Loss, and Crosstalk CHANNEL SELECT MAX474 NO_ NO_ TRANSISTOR COUNT: 26 PROCESS: CMOS Chip Information MHz CAPACITANCE ANALYZER Figure 7. NO_/ Capacitance 9

10 Low-Voltage, 6, 4: Analog Multiplexer in QFN MAX474 Package Information For the latest package outline information and land patter, go to PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 2 QFN-EP G µmax 2-6

11 Low-Voltage, 6, 4: Analog Multiplexer in QFN REVISION NUMBER REVISION DATE DESCRIPTION Revision History PAGES CHANGED / Initial release /8 Ierted exposed paddle description, 7 MAX474 Maxim cannot assume respoibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licees are implied. Maxim reserves the right to change the circuitry and specificatio without notice at any time. Maxim Integrated Products, 2 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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