19-3961; Rev 0; 1/99 2.5, Quad, SPST, CMOS Analog Switches The MAX4601/MAX4602/MAX4603 quad analog switches feature low on-resistance of 2.5 max. On-resistance is matched between switches to 0.5 max and is flat (0.5 max) over the specified signal range. Each switch can handle Rail-to-Rail(R) analog signals. The offleakage current is only 2.5nA maximum at TA = +85C. These analog switches are ideal in low-distortion applications and are the preferred solution over mechanical relays in automatic test equipment or applications where current switching is required. They have low power requirements, require less board space, and are more reliable than mechanical relays. The MAX4601 has four normally closed (NC) switches, the MAX4602 has four normally open (NO) switches, and the MAX4603 has two NC and two NO switches. These switches operate from a single supply of +4.5V to +36V or from dual supplies of 4.5V to 20V. All digital inputs have +0.8V and +2.4V logic thresholds, ensuring TTL/CMOS-logic compatibility when using 15V or a single +12V supply. Features Low On-Resistance (2.5 max) Guaranteed RON Match Between Channels (0.5 max) Guaranteed RON Flatness over Specified Signal Range (0.5 max) Rail-to-Rail Signal Handling Guaranteed ESD Protection > 2000V per Method 3015.7 Single-Supply Operation: +4.5V to +36V Dual-Supply Operation: 4.5V to 20V TTL/CMOS-Compatible Control Inputs Ordering Information Applications Reed Relay Replacement Test Equipment Communication Systems PART TEMP. RANGE MAX4601CAE 0C to +70C MAX4601CWE MAX4601CPE MAX4601EAE MAX4601EWE MAX4601EPE 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 16 SSOP 16 Wide SO 16 Plastic DIP 16 SSOP 16 Wide SO 16 Plastic DIP Ordering Information continued at end of data sheet. PBX, PABX Systems Audio-Signal Routing Avionics Pin Configurations/Functional Diagrams/Truth Tables TOP VIEW IN1 1 16 IN2 COM1 2 15 COM2 NC1 3 14 NC2 V- 4 13 GND 5 NC4 IN1 1 16 COM1 2 15 COM2 NO1 3 14 NC2 V+ V- 4 13 V+ VL GND 5 12 VL NO4 6 11 NC3 COM4 7 10 COM3 IN4 8 9 IN1 1 16 IN2 COM1 2 15 COM2 NO1 3 14 NO2 V+ V- 4 13 12 VL GND 5 12 6 11 NC3 NO4 6 11 NO3 COM4 7 10 COM3 COM4 7 10 COM3 IN4 8 9 IN4 8 9 MAX4601 IN3 MAX4602 SSOP/SO/DIP SSOP/SO/DIP MAX4601 LOGIC SWITCH MAX4602 LOGIC SWITCH 0 1 ON OFF 0 1 IN3 OFF ON MAX4603 IN2 IN3 SSOP/SO/DIP LOGIC MAX4603 SWITCHES 1, 4 SWITCHES 2, 3 0 1 OFF ON ON OFF SWITCHES SHOWN FOR LOGIC "0" INPUT Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX4601/MAX4602/MAX4603 General Description MAX4601/MAX4602/MAX4603 2.5, Quad, SPST, CMOS Analog Switches ABSOLUTE MAXIMUM RATINGS V+ to GND ..............................................................-0.3V to +44V V- to GND ..............................................................+0.3V to -44V V+ to V-...................................................................-0.3V to +44V VL to GND .......................................(GND - 0.3V) to (V+ + 0.3V) All Other Pins to DGND (Note 1) ..........(V- - 0.3V) to (V+ + 0.3V) Continuous Current (COM_, NO_, NC_) ........................200mA Peak Current (COM_, NO_, NC_) (pulsed at 1ms, 10% duty cycle)................................ 300mA Continuous Power Dissipation (TA = +70C) 16 SSOP (derate 7.1mW/C above +70C) ..................571mW 16 Wide SO (derate 9.52mW/C above +70C)............762mW 16 Plastic DIP (derate 10.53mW/C above +70C) ......842mW Operating Temperature Ranges MAX460_C_E ......................................................0C to +70C MAX460_E_E ....................................................-40C to +85C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+300C Note 1: Signals on NC_, NO_, COM_, or IN_ exceeding V+ or V- will be 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, VL = 5V, VIN_H = 2.4V, VIN_L = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS MIN TYP (Note 2) MAX UNITS ANALOG SWITCH Input Voltage Range VCOM_, VNO_, VNC_ COM_ to NO or NC_ On-Resistance RON COM_ to NO_ or NC_ On-Resistance Match Between Channels (Note 4) RON (Note 3) V- TA = +25C ICOM_ = 10mA, VNO_ or VNC_ = 10V TA = TMIN to TMAX ICOM_ = 10mA, VNO_ or = VNC_= 10V V+ 1.7 2.5 2.7 TA = +25C 0.1 TA = TMIN to TMAX V 0.5 COM_ to NO_ or NC_ On-Resistance Flatness (Note 5) RFLAT(ON) ICOM_ = 10mA; VNO_ or VNC_ = -5V, 0, 5V TA = +25C 0.1 Off-Leakage Current (NO_ or NC_) (Note 6) INO_, INC_ VCOM_ = 10V, - 10V VNO_ or VNC_= + TA = +25C -0.5 TA = TMIN to TMAX -2.5 COM Off-Leakage Current (Note 6) ICOM_(OFF) TA = +25C VCOM_ = 10V, - 10V T = T VNO_ or VNC_ = + A MIN to TMAX -0.5 COM On-Leakage Current (Note 6) ICOM_(ON) VCOM_ = 10V, VNO_ or VNC_= 10V or floating TA = TMIN to TMAX 0.4 0.5 0.01 2.5 0.01 -2.5 TA = +25C -1 TA = TMIN to TMAX -10 0.5 0.5 2.5 0.2 nA nA 1 nA 10 LOGIC INPUT Input Current with Input Voltage High IIN_H IN_ = 2.4V, all others = 0.8V -0.500 0.001 0.500 A Input Current with Input Voltage Low IIN_L IN_ = 0.8V, all others = 2.4V -0.500 0.001 0.500 A Logic Input High Voltage VIN_H Logic Input Low Voltage VIN_L 2 2.4 1.7 1.7 _______________________________________________________________________________________ V 0.8 V 2.5, Quad, SPST, CMOS Analog Switches (V+ = +15V, V- = -15V, VL = 5V, VIN_H = 2.4V, VIN_L = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 20.0 V POWER SUPPLY Power-Supply Range 4.5 Positive Supply Current I+ All channels on or off, TA = +25C VIN = 0 or 5V TA = TMIN to TMAX -0.5 Negative Supply Current I- All channels on or off, TA = +25C VIN = 0 or 5V TA = TMIN to TMAX -0.5 Logic Supply Current IL All channels on or off, TA = +25C VIN = 0 or 5V TA = TMIN to TMAX All channels on or off, TA = +25C VIN = 0 or 5V TA = TMIN to TMAX -0.5 Ground Current IGND 0.001 -5 5 0.001 -5 0.5 5 0.001 -5 -0.5 0.5 0.5 5 0.001 -5 0.5 5 A A A A SWITCH DYNAMIC CHARACTERISTICS Turn-On Time tON Figure 2, VCOM_ = 10V, TA = +25C 160 250 ns Turn-Off Time tOFF Figure 2, VCOM_ = 10V, TA = +25C 190 350 ns CL = 1.0nF, VGEN = 0, RGEN = 0, Figure 3, TA = +25C 120 pC Charge Injection Q Off-Isolation (Note 7) VISO RL = 50, CL= 5pF, f = 1MHz, Figure 4, TA = +25C -56 dB Crosstalk (Note 8) VCT RL = 50, CL = 5pF, f = 1MHz, Figure 5, TA = +25C -59 dB NC_ or NO_ Capacitance C(OFF) f = 1MHz, Figure 6, TA = +25C 55 pF COM Off-Capacitance C(COM) f = 1MHz, Figure 6, TA = +25C 55 pF On-Capacitance C(COM) f = 1MHz, Figure 7, TA = +25C 250 pF _______________________________________________________________________________________ 3 MAX4601/MAX4602/MAX4603 ELECTRICAL CHARACTERISTICS--Dual Supplies (continued) MAX4601/MAX4602/MAX4603 2.5, Quad, SPST, CMOS Analog Switches ELECTRICAL CHARACTERISTICS--Single +12V Supply (V+ = 12V, V- = 0, VL = 5V, VIN_H = 2.4V, V IN_L = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS MIN TYP (Note 2) MAX UNITS ANALOG SWITCH Input Voltage Range COM_ to NO or NC_ On-Resistance COM_ to NO_ or NC_ On-Resistance Match Between Channels (Note 4) COM_ to NO_ or NC_ On-Resistance Flatness (Note 5) VCOM_, VNO_, (Note 3) VNC_ RON ICOM_ = 10mA, VNO_ or VNC_ = 10V RON ICOM_ = 10mA, VNO_ or = VNC_= 10V RFLAT(ON) ICOM_ = 10mA; VNO_ or VNC_ = 3V, 6V, 9V GND TA = +25C V+ 3 TA = TMIN to TMAX 4 5 TA = +25C 0.03 TA = TMIN to TMAX 0.4 V 0.5 TA = +25C 0.1 TA = TMIN to TMAX 0.4 0.5 Off-Leakage Current (NO_ or NC_) (Notes 6, 9) INO_ INC_ VCOM_ = 1V, 10V; VNO_ or VNC_ = 10V, 1V TA = +25C -0.5 TA = TMIN to TMAX -2.5 COM Off-Leakage Current (Notes 6, 9) ICOM_(OFF) VNO_ or VNC_ = 10V, 1V; VCOM_ = 1V, 10V TA = +25C -0.5 TA = TMIN to TMAX -2.5 COM On-Leakage Current (Notes 6, 9) VCOM_ = 1V ,10V; VNO_ or VNC_ = 1V, 10V, or floating TA = +25C -1 ICOM_(ON) TA = TMIN to TMAX -10 0.01 0.5 nA 2.5 0.01 0.5 2.5 0.01 nA 1 nA 10 LOGIC INPUT Input Current with Input Voltage High IIN_H IN_ = 2.4V, all others = 0.8V -0.500 0.001 0.500 A Input Current with Input Voltage Low IIN_L IN_ = 0.8V, all others = 2.4V -0.500 0.001 0.500 A Logic Input High Voltage VIN_H Logic Input Low Voltage VIN_L 2.4 V 0.8 V 36.0 V POWER SUPPLY Power-Supply Range 4.5 Positive Supply Current I+ All channels on or off, VIN = 0 or 5V TA = +25C Logic Supply Current IL All channels on or off, VIN = 0 or 5V TA = +25C Ground Current 4 IGND VIN = 0 or 5V TA = TMIN to TMAX TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX -0.5 0.001 -5 -0.5 5 0.001 -5 -0.5 0.5 0.5 5 0.001 -5 _______________________________________________________________________________________ 0.5 5 A A A 2.5, Quad, SPST, CMOS Analog Switches (V+ = 12V, V- = 0, VL = 5V, VIN_H = 2.4V, V IN_L = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS MIN TYP (Note 2) MAX UNITS SWITCH DYNAMIC CHARACTERISTICS Turn-On Time tON Figure 2, VCOM_ = 10V, TA = +25C 160 ns Turn-Off Time tOFF Figure 2, VCOM_ = 10V, TA = +25C 170 ns CL = 1.0nF, VGEN = 0, RGEN = 0, Figure 3, TA = +25C 20 pC RL = 50, CL= 5pF, f = 1MHz, Figure 5, TA = +25C -60 dB 85 pF Charge Injection Q Crosstalk (Note 8) VCT NC_ or NO_ Capacitance C(OFF) f = 1MHz, Figure 6, TA = +25C COM Off-Capacitance C(COM) f = 1MHz, Figure 6, TA = +25C 85 pF On-Capacitance C(COM) f = 1MHz, Figure 7, TA = +25C 140 pF 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: Guaranteed by design. Note 4: RON = RON(MAX) - RON(MIN). Note 5: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal range. Note 6: Leakage parameters are 100% tested at maximum-rated hot temperature and guaranteed by correlation at +25C. Note 7: Off-isolation = 20 log10 [VCOM / (VNC or VNO)], VCOM = output, VNC or VNO = input to off switch. Note 8: Between any two switches. Note 9: Leakage testing at single supply is guaranteed by testing with dual supplies. _______________________________________________________________________________________ 5 MAX4601/MAX4602/MAX4603 ELECTRICAL CHARACTERISTICS--Single +12V Supply (continued) Typical Operating Characteristics (TA = +25C, unless otherwise noted.) ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY) 3.50 3.00 6 5 RON () V+ = 12V 4 1k TA = +25C 2.50 TA = -40C 2.00 1.50 10 1 0.1 1.00 2 1 0.50 0 0 1m 6 8 10 12 14 16 18 20 22 24 0 1 2 3 4 5 6 7 8 -40 9 10 11 12 40 60 CHARGE INJECTION vs. VCOM POWER-SUPPLY CURRENT vs. TEMPERATURE TURN-ON/OFF TIME vs. TEMPERATURE MAX4601 toc 04 V+ = 15V V- = -15V V+ = 15V V- = 0 10k V+ = 15V V- = -15V I+, I- (nA) 0 100 I+ 10 I- 1 -100 VCOM = 10V RL = 100 CL = 35pF 200 100 tOFF 150 tON 100 0.1 -200 80 250 1k 100 50 0.01 -300 0 5 10 -40 15 -20 0 20 40 60 VCOM (V) TEMPERATURE (C) TURN-ON/OFF TIME vs. SUPPLY VOLTAGE TURN-ON/OFF TIME vs. VCOM 270 VCOM = 10V RL = 100 CL = 35pF 250 230 150 tON 110 200 150 tON 100 -10 -8 -6 -4 -2 0 2 VCOM (V) 4 35 60 85 6 MAX4601 toc 09 -10 8 10 180 90 ON-RESPONSE -0 -20 -30 0 V+ = V- (V) 10 0 tOFF 90 10 11 12 13 14 15 16 17 18 19 20 -15 FREQUENCY RESPONSE 50 70 -40 TEMPERATURE (C) RL = 100 CL = 35pF tON, tOFF (ns) 170 100 250 tOFF 190 80 -90 ON-PHASE -40 -180 -50 -270 -60 OFF-ISOLATION -360 -70 -450 -80 -540 -90 -630 -100 -720 100 0.1 1 10 FREQUENCY (MHz) _______________________________________________________________________________________ PHASE (degrees) 0 LOSS (dB) -5 MAX4601 toc 08 -10 MAX4601 toc 07 -15 6 20 TEMPERATURE (C) 200 130 0 VCOM (V) 300 210 -20 VCOM (V) MAX4601 toc 06 4 0.1m tON, tOFF (ns) 2 OFF-LEAKAGE 0.01 V+ = 12V 0 ON-LEAKAGE 100 V+ = 24V 3 V+ = 15V V- = -15V 10k MAX4601 toc 05 RON () 7 Q (pC) TA = +85C LEAKAGE (pA) V+ = 5V 100k MAX4601 toc 02 9 8 4.00 MAX4601 toc01 10 ON/OFF-LEAKAGE CURRENT vs. TEMPERATURE MAX4601 toc 03 ON-RESISTANCE vs. VCOM (SINGLE SUPPLY) tON, tOFF (ns) MAX4601/MAX4602/MAX4603 2.5, Quad, SPST, CMOS Analog Switches 2.5, Quad, SPST, CMOS Analog Switches (TA = +25C, unless otherwise noted.) ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES) ON-RESISTANCE vs. VCOM (DUAL SUPPLIES) 4.0 2.25 TA = +85C 2.00 V+, V- = 5V 1.75 3.0 1.50 RON () 3.5 2.5 1.25 2.0 1.00 1.5 0.75 1.0 0.50 V+, V- = 15V 0.5 MAX4601 toc 11 4.5 RON () 2.50 MAX4601 toc 10 5.0 TA = +25C TA = -40C 0.25 V+, V- = 20V 0 V+, V- = 15V 0 -20 -15 -10 -5 0 5 10 15 20 -15 -10 -5 VCOM (V) 0 5 10 15 VCOM (V) Pin Description PIN NAME FUNCTION MAX4601 MAX4602 MAX4603 1, 16, 9, 8 1, 16, 9, 8 1, 16, 9, 8 IN1, IN2, IN3, IN4 2, 15, 10, 7 2, 15, 10, 7 2, 15, 10, 7 COM1, COM2, COM3, COM4 3, 14, 11, 6 -- -- NC1, NC2, NC3, NC4 Analog Switch Normally Closed Terminals -- 3, 14, 11, 6 -- NO1, NO2, NO3, NO4 Analog Switch Normally Open Terminals -- -- 3, 6 NO1, NO4 Analog Switch Normally Open Terminals -- -- 14, 11 NC2, NC3 Analog Switch Normally Closed Terminals 4 4 4 V- 5 5 5 GND 12 12 12 VL Logic-Supply Input 13 13 13 V+ Positive Analog Supply Input Logic-Control Digital Inputs Analog Switch Common Terminals Negative Analog Supply-Voltage Input. Connect to GND for singlesupply operation. Ground _______________________________________________________________________________________ 7 MAX4601/MAX4602/MAX4603 Typical Operating Characteristics (continued) MAX4601/MAX4602/MAX4603 2.5, Quad, SPST, CMOS Analog Switches Applications Information Overvoltage Protection Proper power-supply sequencing is recommended for all CMOS devices. Do not exceed the absolute maximum ratings, because stresses beyond the listed ratings can cause permanent damage to the devices. Always sequence V+ on first, then V-, followed by the logic inputs, NO, or COM. If power-supply sequencing is not possible, add two small signal diodes (D1, D2) in series with the supply pins for overvoltage protection (Figure 1). Adding diodes reduces the analog signal range to one diode drop below V+ and one diode drop above V-, but does not affect the devices' low switch resistance and low leakage characteristics. Device operation is unchanged, and the difference between V+ and V- should not exceed 44V. These protection diodes are not recommended when using a single supply. switch independent of the circuit. The graphs shown in the Typical Operating Characteristics were taken using a 50 source and load connected with BNC connectors to a circuit board deemed "average;" that is, designed with isolation in mind, but not using strip-line or other special RF circuit techniques. For critical applications above 5MHz, use the MAX440, MAX441, and MAX442, which are fully characterized up to 160MHz. +15V D1 * * * * NO_ COM_ Off-Isolation at High Frequencies In 50 systems, the high-frequency on-response of these parts extends from DC to above 100MHz with a typical loss of -2dB. When the switch is turned off, however, it behaves like a capacitor, and off-isolation decreases with increasing frequency. (Above 300MHz, the switch actually passes more signal turned off than turned on.) This effect is more pronounced with higher source and load impedances. Above 5MHz, circuit board layout becomes critical, and it becomes difficult to characterize the response of the MAX4601 MAX4602 MAX4603 V+ VD2 * INTERNAL PROTECTION DIODES -15V Figure 1. Overvoltage Protection Using External Blocking Diodes Timing Diagrams/Test Circuits +5V LOGIC INPUT t r < 20ns t f < 20ns +3V 50% SWITCH V COM_ INPUT 0 +15V VL COM_ VO 0.9V0 0.9V0 t ON LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE. LOGIC INPUT VO OR NC_ RL 100 IN_ 0 SWITCH OUTPUT V+ NO_ t OFF SWITCH OUTPUT MAX4601 MAX4602 MAX4603 GND V- 0 -15V REPEAT TEST FOR EACH SWITCH. FOR LOAD CONDITIONS, SEE Electrical Characteristics. CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL VO = VCOM RL + RON ( ) Figure 2. Switching-Time Test Circuit 8 _______________________________________________________________________________________ CL 35pF 2.5, Quad, SPST, CMOS Analog Switches MAX4601 MAX4602 MAX4603 RGEN +5V +15V VL V+ VO VO COM NC OR NO VO VIN CL V GEN GND IN OFF -15V VIN OFF ON V- ON OFF OFF Q = (V O )(C L ) VIN = +3V VIN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH. Figure 3. Charge-Injection Test Circuit C +15V +5V V+ VL SIGNAL GENERATOR 0dBm MAX4601 MAX4602 MAX4603 C SIGNAL GENERATOR 0dBm +15V +5V V+ VL COM1 COM COM ANALYZER 0, 2.4V GND 0, 2.4V V- RL 0, 2.4V COM2 N02 ANALYZER NC OR NO GND C 50 N01 IN2 IN1 IN MAX4601 MAX4602 MAX4603 V- RL NC C -15V -15V Figure 4. Off-Isolation Test Circuit Figure 5. Crosstalk Test Circuit _______________________________________________________________________________________ 9 MAX4601/MAX4602/MAX4603 Timing Diagrams/Test Circuits (continued) MAX4601/MAX4602/MAX4603 2.5, Quad, SPST, CMOS Analog Switches Timing Diagrams/Test Circuits (continued) C +15V +5V V+ VL COM MAX4601 MAX4602 MAX4603 C +15V +5V V+ VL COM MAX4601 MAX4602 MAX4603 CAPACITANCE METER IN IN 0 or 2.4V CAPACITANCE METER 0 or 2.4V f = 1MHz NC OR NO NC OR NO f = 1MHz GND GND V- V- C C -15V -15V Figure 6. Switch Off-Capacitance Test Circuit Figure 7. Switch On-Capacitance Test Circuit Ordering Information (continued) PART MAX4602CAE MAX4602CWE MAX4602CPE MAX4602EAE MAX4602EWE MAX4602EPE MAX4603CAE MAX4603CWE MAX4603CPE MAX4603EAE MAX4603EWE MAX4603EPE 10 TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 16 SSOP 16 Wide SO 16 Plastic DIP 16 SSOP 16 Wide SO 16 Plastic DIP 16 SSOP 16 Wide SO 16 Plastic DIP 16 SSOP 16 Wide SO 16 Plastic DIP Chip Information TRANSISTOR COUNT: 100 ______________________________________________________________________________________ 2.5, Quad, SPST, CMOS Analog Switches SSOP.EPS ______________________________________________________________________________________ 11 MAX4601/MAX4602/MAX4603 Package Information 2.5, Quad, SPST, CMOS Analog Switches SOICW.EPS MAX4601/MAX4602/MAX4603 Package Information Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.