19-0270; Rev 0; 8/94 Precision, 16-Channel/Dual 8-Channel, High-Performance, CMOS Analog Multiplexers ________________________Applications Sample-and-Hold Circuits Test Equipment Heads-Up Displays Guidance and Control Systems Military Radios Communications Systems Battery-Operated Systems PBX, PABX Audio Signal Routing ____________________________Features ♦ Guaranteed On-Resistance Match Between Channels, <5Ω Max ♦ Low On-Resistance, <100Ω Max ♦ Guaranteed Flat On-Resistance over Specified Signal Range, 7Ω Max ♦ Guaranteed Charge Injection, <10pC ♦ INO(OFF) Leakage <2.5nA at +85°C ♦ ICOM(OFF) Leakage <20nA at +85°C ♦ ESD Protection >2000V ♦ Plug-In Upgrade for Industry-Standard DG406/DG407/DG506A/DG507A ♦ Single-Supply Operation (+4.5V to +30V) Bipolar-Supply Operation (±4.5V to ±20V) ♦ Low Power Consumption, <1.25mW ♦ Rail-to-Rail Signal Handling ♦ TTL/CMOS-Logic Compatible ______________Ordering Information PART TEMP. RANGE PIN-PACKAGE MAX306CPI MAX306CWI MAX306C/D MAX306EPI MAX306EWI MAX306EQI MAX306MJI 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -55°C to +125°C 28 Plastic DIP 28 Wide SO Dice* 28 Plastic DIP 28 Wide SO 28 PLCC 28 CERDIP Ordering Information continued at end of data sheet. * Contact factory for dice specifications. V+ COM 3 2 1 28 27 26 NO8 N.C. 4 V- N.C. TOP VIEW NO16 _____________________Pin Configurations/Functional Diagrams/Truth Tables V+ NO15 5 25 NO7 NO14 6 24 NO6 NO13 7 23 NO5 NO12 8 22 NO4 MAX306 21 N03 10 20 N02 NO9 11 19 N01 16 17 18 A0 A2 A3 N.C. GND 12 13 14 15 EN 9 NO10 A1 NO11 PLCC N.C. = NO INTERNAL CONNECTION Continued at end of data sheet. V- GND NO1 NO2 NO3 NO4 NO5 NO6 NO7 NO8 NO9 NO10 NO11 NO12 NO13 NO14 NO15 NO16 COM CMOS DECODERS/DRIVERS A0 A1 A2 A3 EN MAX306 16-CHANNEL SINGLE-ENDED MULTIPLEXER ________________________________________________________________ Maxim Integrated Products Call toll free 1-800-998-8800 for free samples or literature. 1 MAX306/MAX307 _______________General Description The MAX306/MAX307 precision, monolithic, CMOS analog multiplexers (muxes) offer low on-resistance (less than 100Ω), which is matched to within 5Ω between channels and remains flat over the specified analog signal range (7Ω max). They also offer low leakage over temperature (I NO(OFF) less than 2.5nA at +85°C) and fast switching speeds (tTRANS less than 250ns). The MAX306 is a single-ended 1-of-16 device, and the MAX307 is a differential 2-of-8 device. The MAX306/MAX307 are fabricated with Maxim’s improved 44V silicon-gate process. Design improvements yield extremely low charge injection (less than 10pC) and guarantee electrostatic discharge (ESD) protection greater than 2000V. These muxes operate with a single +4.5V to +30V supply, or bipolar ±4.5V to ±20V supplies, while retaining TTL/CMOS-logic input compatibility and fast switching. CMOS inputs provide reduced input loading. These improved parts are plug-in upgrades for the industrystandard DG406, DG407, DG506A, and DG507A. MAX306/MAX307 Precision, 16-Channel/Dual 8-Channel, High-Performance, CMOS Analog Multiplexers ABSOLUTE MAXIMUM RATINGS Voltage Referenced to VV+ ............................................................................-0.3V, 44V GND .........................................................................-0.3V, 25V Digital Inputs, NO, COM (Note 1)...........(V- - 2V) to (V+ + 2V) or 30mA (whichever occurs first) Continuous Current (any terminal) ......................................30mA Peak Current, NO or COM (pulsed at 1ms, 10% duty cycle max) ..........................100mA Continuous Power Dissipation (TA = +70°C) Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW Wide SO (derate 12.50mW/°C above +70°C)............1000mW PLCC (derate 10.53mW/°C above +70°C) ..................842mW CERDIP (derate 16.67mW/°C above +70°C) .............1333mW Operating Temperature Ranges MAX30_C_ _ .......................................................0°C to +70°C MAX30_E_ _.....................................................-40°C to +85°C MAX30_MJI....................................................-55°C to +125°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+300°C Signals on NO, COM, A0, A1, A2, A3, or EN exceeding V+ or V- are clamped by internal diodes. Limit forward current to maximum current ratings. Note 1: 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, GND = 0V, VAH = +2.4V, VAL = +0.8V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL MIN CONDITIONS TYP MAX (Note 2) UNITS SWITCH Analog Signal Range On-Resistance VNO, VCOM RON (Note 3) -15 INO = -1.0mA, VCOM = ±10V TA = +25°C ∆RON INO = -1.0mA, VCOM = ±10V (Note 4) TA = +25°C On-Resistance Flatness RFLAT INO = -1.0mA, VCOM = ±5V or 0V TA = +25°C NO-Off Leakage Current (Note 5) VCOM = +10V, VNO = ±10V, VEN = 0V TA = +25°C INO(OFF) VNO = ±10V, VCOM = +10V, MAX306 VEN = 0V TA = +25°C VNO = +10V, VCOM = ±10V, MAX307 VEN = 0V TA = +25°C ICOM(OFF) 60 TA = TMIN to TMAX On-Resistance Matching Between Channels COM-Off Leakage Current (Note 5) 1.5 TA = TMIN to TMAX TA = TMIN to TMAX 2 ICOM(ON) VCOM = ±10V, MAX306 VNO = ±10V, sequence each switch MAX307 on TA = TMIN to TMAX 1.8 7 10 -0.5 0.01 -2.5 2.5 M -5.0 5.0 -0.75 C, E -20 M -40 -0.75 C, E -10 M -20 -0.75 C, E -25 M -50 -0.75 C, E M 0.02 V Ω Ω Ω 0.5 C, E TA = +25°C TA = TMIN to TMAX 5 8 TA = TMIN to TMAX TA = TMIN to TMAX 100 125 TA = TMIN to TMAX TA = +25°C COM-On Leakage Current (Note 5) 15 nA 0.75 20 40 0.02 0.75 nA 10 20 0.02 0.75 25 50 0.02 0.75 -12.5 12.5 -25 25 _______________________________________________________________________________________ nA Precision, 16-Channel/Dual 8-Channel, High-Performance, CMOS Analog Multiplexers (V+ = +15V, V- = -15V, GND = 0V, VAH = +2.4V, VAL = +0.8V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX (Note 2) UNITS INPUT Input Current with Input Voltage High IAH VA = 2.4V or 15V -1.0 1.0 µA Input Current with Input Voltage Low IAL VEN = 0V or 2.4V, VA = 0V -1.0 1.0 µA ±20 30 75 0.5 1 1 10 V SUPPLY Power-Supply Range ±4.5 VEN = VA = 0V or 4.5V Positive Supply Current Negative Supply Current I+ I- VEN = 2.4V, VA(ALL) = 0V or 2.4V VEN = 2.4V, VA(ALL) = 0V or 2.4V TA = +25°C TA = TMIN to TMAX TA = +25°C TA = TMIN to TMAX TA = +25°C TA = TMIN to TMAX 16 0.075 -1 -10 µA mA µA DYNAMIC Transistion Time tTRANS Figure 2 Break-Before-Make Interval tOPEN Figure 4 Enable Turn-On Time tON(EN) Figure 3 Enable Turn-Off Time tOFF(EN) Figure 3 TA = +25°C TA = TMIN to TMAX TA = +25°C TA = +25°C TA = TMIN to TMAX TA = +25°C TA = TMIN to TMAX 110 10 40 130 55 300 400 ns ns 200 400 150 300 ns ns CL = 1.0nF, VNO = 0V, RS = 0Ω, Figure 5 TA = +25°C 2 VISO VEN = 0V, RL = 1kΩ, f = 100kHz, Figure 6 TA = +25°C -69 dB Crosstalk Between Channels VCT VEN = 2.4V, f = 100kHz, VGEN = 1VP-P, RL = 1kΩ, Figure 7 TA = +25°C -92 dB Logic Input Capacitance CIN f = 1MHz TA = +25°C 8 pF f = 1MHz, VEN = VNO = 0V, Figure 8 TA = +25°C 8 pF Charge Injection (Note 3) Q Off Isolation (Note 6) NO-Off Capacitance COM-Off Capacitance COM-On Capacitance CNO(OFF) f = 1MHz, VEN = 0.8V, CCOM(OFF) VCOM = 0V, Figure 8 f = 1MHz, VEN = 2.4V, CCOM(ON) VCOM = 0V, Figure 8 MAX306 pC 130 TA = +25°C MAX307 pF 65 MAX306 140 TA = +25°C MAX307 10 pF 70 _______________________________________________________________________________________ 3 MAX306/MAX307 ELECTRICAL CHARACTERISTICS—Dual Supplies (continued) MAX306/MAX307 Precision, 16-Channel/Dual 8-Channel, High-Performance, CMOS Analog Multiplexers ELECTRICAL CHARACTERISTICS—Single Supply (V+ = +12V, V- = 0V, GND = 0V, VAH = +2.4V, VAL = +0.8V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX (Note 2) UNITS SWITCH Analog Signal Range On-Resistance VNO, VCOM RON (Note 3) INO = -1.0mA VCOM = 3V or 10V 0 12 V TA = +25°C 120 175 Ω TA = +25°C 130 450 ns TA = +25°C 105 600 ns TA = +25°C 80 300 ns TA = +25°C 2 10 pC DYNAMIC Transition Time (Note 3) tTRANS Enable Turn-On Time (Note 3) tON(EN) Enable Turn-Off Time (Note 3) tOFF(EN) Charge Injection (Note 3) Q VNO1 = 8V, VNO8 = 0V, VIN = 2.4V, Figure 1 VINH = 2.4V, VINL = 0V, VNO1 = 5V, Figure 3 VINH = 2.4V, VINL = 0V, VNO1 = 5V, Figure 3 CL = 1.0nF, VNO = 0V, RS = 0Ω 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). On-resistance match between channels and flatness are guaranteed only with specified voltages. Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured at the extremes of the specified analog signal range. Note 5: Leakage parameters are 100% tested at the maximum rated hot temperature and guaranteed by correlation at +25°C. Note 6: Off isolation = 20log VCOM/VNO, where VCOM = output and VNO = input to off switch. 4 _______________________________________________________________________________________ Precision, 16-Channel/Dual 8-Channel, High-Performance, CMOS Analog Multiplexers ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES) 140 ±5V ON-RESISTANCE vs. VCOM (SINGLE SUPPLY) 400 V+ = +15V V- = -15V 100 360 320 120 ±10V ±15V 60 60 +25°C -55°C 40 ±20V RON (Ω) 80 280 +85°C RON (Ω) 200 160 40 10V 120 20 20 0 -15 -10 -5 0 5 10 15 -10 -5 VCOM (V) 15 0 +85°C +25°C 80 -55°C 40 5 10 1 ICOM (ON) 10 1 0.1 0.01 INO (OFF) ICOM (ON) 0.001 0.0001 -55 -35 -15 15 V+ = +15V V- = -15V 100 0.0001 0 5 25 45 65 85 105 125 -55 -35 -15 TEMPERATURE (°C) 100 MAX306/7 TOC-07 20 I+ 10 I+, I- (µA) V+ = +15V V- = -15V 0 V+ = 12V V- = 0V -10 65 85 105 125 SUPPLY CURRENT vs. TEMPERATURE CHARGE INJECTION vs. VCOM 30 25 45 5 TEMPERATURE (°C) MAX306/7 TOC-08 VCOM (V) 10 20 ON LEAKAGE vs. TEMPERATURE 10 0.1 15 1000 0.001 20 Qj (pC) 10 VCOM (V) V+ = +15V V- = -15V 100 0.01 0 5 OFF LEAKAGE vs. TEMPERATURE OFF LEAKAGE (nA) +125°C 60 10 MAX306/7 TOC-05 V+ = +15V V- = 0V 100 5 1000 MAX306/7 TOC-04 160 120 0 VCOM (V) ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY) 140 20V 40 -15 20 15V 80 ON LEAKAGE (nA) 0 -20 RON (Ω) 5V 240 MAX306/7 TOC-06 RON (Ω) 100 +125°C 80 MAX306/7 TOC-03 MAX306/7 TOC-01 160 120 MAX306/7 TOC-02 ON-RESISTANCE vs. VCOM (DUAL SUPPLIES) 1 0.1 I0.01 -20 V+ = +15V V- = -15V VEN = VA = 0V, 4.5V 0.001 -30 -15 -10 -5 0 VCOM (V) 5 10 15 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (°C) _______________________________________________________________________________________ 5 MAX306/MAX307 __________________________________________Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) MAX306/MAX307 Precision, 16-Channel/Dual 8-Channel, High-Performance, CMOS Analog Multiplexers _____________________________________________________________Pin Descriptions MAX306 PIN NAME 1 V+ 2, 3, 13 N.C. 4–11 NO16–NO9 12 GND 14–17 A3–A0 18 EN 19–26 NO1–NO8 27 V- 28 COM FUNCTION MAX307 PIN FUNCTION Positive Supply Voltage Input 1 V+ No Internal Connections 2 COMB Output B–bidirectional 3, 13, 14 N.C. No Internal Connection 4–11 NO8B–NO1B 12 GND 15, 16, 17 A2, A1, A0 18 EN 19–26 NO1A–NO8A 27 V- 28 COMA Analog Inputs–bidirectional Ground Address Inputs Enable Inputs Analog Inputs–bidirectional Negative Supply Voltage Input Output–bidirectional __________Applications Information Operation with Supply Voltages Other than ±15V 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 may cause permanent damage to the devices. Always sequence V+ on first, then V-, followed by either the logic inputs, NO, or COM. If power-supply sequencing is not possible, add two small signal diodes in series with supply pins for overvoltage protection (Figure 1). Adding diodes reduces the analog Positive Supply Voltage Input Analog Inputs–bidirectional Ground Address Inputs Enable Input Analog Inputs–bidirectional Negative Supply Voltage Input Output A–bidirectional signal range to 1V above V+ and 1V below V-, but low switch resistance and low leakage characteristics are unaffected. Device operation is unchanged, and the difference between V+ and V- should not exceed +44V. Using supply voltages other than ±15V will reduce the analog signal range. The MAX306/MAX307 switches operate with ±4.5V to ±20V bipolar supplies or with a +4.5V to +30V single supply; connect V- to GND when operating with a single supply. Also, both device types can operate with unbalanced supplies such as +24V and -5V. The Typical Operating Characteristics graphs show typical on-resistance with 20V, 15V, 10V, and 5V supplies. (Switching times increase by a factor of two or more for operation at 5V.) 6 NAME V+ NO COM Vg V- Figure 1. Overvoltage Protection Using External Blocking Diodes _______________________________________________________________________________________ Precision, 16-Channel/Dual 8-Channel, High-Performance, CMOS Analog Multiplexers +15V V+ NO1 A0 A1 ±10V NO2-NO15 A2 A3 MAX306 NO16 EN COM GND +10V VOUT V- LOGIC INPUT 50% 35pF 50Ω 0V 300Ω -15V +15V VNO1 SWITCH OUTPUT VOUT V+ NO1B A0 ±10V 90% 0V A1 90% NO1A-NO8A A2 VNO16 NO8B EN +10V ON VOUT V- 50Ω tTRANS tTRANS MAX307 COMB GND tr < 20ns tf < 20ns +3V 35pF 300Ω -15V Figure 2. Transition Time +15V V+ EN NO1 A0 -5V NO2-NO16 A1 MAX306 A2 A3 COM GND 50Ω VOUT V- 35pF 1kΩ LOGIC INPUT A1 V+ NO1B 10% SWITCH OUTPUT -5V NO1A-NO8A NO2B-NO8B, COMA 90% VOUT MAX307 A2 50Ω tOFF(EN) 0V +15V A0 50% 0V tON(EN) -15V EN tr < 20ns tf < 20ns +3V GND COMB V- VOUT 1kΩ 35pF -15V Figure 3. Enable Switching Time _______________________________________________________________________________________ 7 MAX306/MAX307 ______________________________________________Test Circuits/Timing Diagrams MAX306/MAX307 Precision, 16-Channel/Dual 8-Channel, High-Performance, CMOS Analog Multiplexers _________________________________Test Circuits/Timing Diagrams (continued) +15V +2.4V V+ EN A0 NO1-NO16 LOGIC INPUT +5V tr < 20ns tf < 20ns +3V 50% 0V A1 A2 VOUT MAX306 80% A3 COM GND SWITCH OUTPUT VOUT V- 35pF tOPEN 0V 300Ω 50Ω -15V Figure 4. Break-Before-Make Interval +15V RS NO1-NO16 V+ LOGIC INPUT EN VS CHANNEL SELECT OFF ON OFF 0V A0 COM A1 A2 A3 +3V VOUT MAX306 CL = 1000nF GND V- ∆VOUT VOUT ∆VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. -15V Q = CL = ∆VOUT Figure 5. Charge Injection 8 _______________________________________________________________________________________ Precision, 16-Channel/Dual 8-Channel, High-Performance, CMOS Analog Multiplexers +15V +15V 10nF VOUT VIN V+ NO1 RS = 50Ω RL = 1kΩ NO16 A0 COM A1 NO2 RL = 1kΩ A0 A1 A2 A3 GND EN 10nF A3 GND V- -15V OFF ISOLATION = 20log V+ NO1 NO16 VOUT RS = 50Ω MAX306 A2 10nF COM MAX306 EN 10nF V- -15V VOUT VIN CROSSTALK = 20log Figure 6. Off Isolation VOUT VIN Figure 7. Crosstalk +15V V+ A3 CHANNEL SELECT NO1 Meter A2 MAX306 A1 NO16 A0 GND EN COM V- Impedance Analyzer f = 1MHz -15V Figure 8. NO/COM Capacitance _______________________________________________________________________________________ 9 MAX306/MAX307 _________________________________Test Circuits/Timing Diagrams (continued) MAX306/MAX307 Precision, 16-Channel/Dual 8-Channel, High-Performance, CMOS Analog Multiplexers ________Pin Configurations/Functional Diagrams/Truth Tables (continued) TOP VIEW V+ 1 28 COM N.C. 2 27 V- A3 A2 A1 A0 EN ON Switch N.C. 3 26 NO8 NO16 4 25 NO7 X 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 X 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 X 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 X 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 None 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 NO15 5 NO14 6 24 NO6 MAX306 23 NO5 NO13 7 22 NO4 NO12 8 21 NO3 NO11 9 20 NO2 NO10 10 19 NO1 NO9 11 18 EN GND 12 17 A0 N.C. 13 16 A1 A3 14 15 A2 MAX306 LOGIC “0” VAL ≤ 0.8V, LOGIC “1” = VAH ≥ 2.4V DIP/SO TOP VIEW V+ 1 28 COMA COMB 2 27 V- N.C. 3 26 NO8A NO8B 4 25 NO7A NO7B 5 24 NO6A NO6B 6 MAX307 23 NO5A 22 NO4A NO5B 7 NO4B 8 21 NO3A NO3B 9 20 NO2A NO2B 10 19 NO1A NO1B 11 18 EN GND 12 17 A0 N.C. 13 16 A1 N.C. 14 15 A2 A2 A1 A0 EN ON Switch X 0 0 0 0 1 1 1 1 X 0 0 1 1 0 0 1 1 X 0 1 0 1 0 1 0 1 0 1 1 1 1 1 1 1 1 None 1 2 3 4 5 6 7 8 MAX307 LOGIC “0” VAL ≤ 0.8V, LOGIC “1” = VAH ≥ 2.4V DIP/SO 10 ______________________________________________________________________________________ Precision, 16-Channel/Dual 8-Channel, High-Performance, CMOS Analog Multiplexers V+ COMA 3 2 1 28 27 26 NO8A COMB 4 V- N.C. V+ NO8B TOP VIEW NO7B 5 25 NO7A NO6B 6 24 NO6A NO5B 7 23 NO5A NO4B 8 22 NO4A NO3B 9 21 N03A NO2B 10 20 N02A NO1B 11 19 N01A EN A0 A1 A2 18 N.C. 16 17 N.C. 12 13 14 15 GND MAX307 PLCC V- GND NO1A NO2A NO3A NO4A NO5A NO6A NO7A NO8A NO1B NO2B NO3B NO4B NO5B NO6B NO7B NO8B COMA COMB CMOS DECODERS/DRIVERS A0 A1 A2 EN MAX307 8-CHANNEL DIFFERENTIAL MULTIPLEXER N.C. = NO INTERNAL CONNECTION _Ordering Information (continued) PART MAX307CPI MAX307CWI MAX307C/D MAX307EPI MAX307EWI MAX307EQI MAX307MJI TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -55°C to +125°C PIN-PACKAGE 28 Plastic DIP 28 Wide SO Dice* 28 Plastic DIP 28 Wide SO 28 PLCC 28 CERDIP * Contact factory for dice specifications. ______________________________________________________________________________________ 11 MAX306/MAX307 ________Pin Configurations/Functional Diagrams/Truth Tables (continued) MAX306/MAX307 Precision, 16-Channel/Dual 8-Channel, High-Performance, CMOS Analog Multiplexers __________________________________________________________Chip Topographies MAX306 EN A0 A1 A2 MAX307 A3 N.C. EN A0 A1 A2 N.C. N.C. 0.184" (4.67mm) 0.184" (4.67mm) GND NO1 NO9 NO2 NO10 NO3 NO11 N04 NO12 NO5 N013 NO6 NO14 NO7 NO15 NO8 NO16 GND NO1A NO1B NO2A NO2B NO3A NO3B N04A NO4B NO5A N05B NO6A NO6B NO7A NO7B NO8A NO8B N.C. V- COM V+ COMB V- 0.078" (1.98mm) COMA V+ 0.078" (1.98mm) N.C. = NO INTERNAL CONNECTION TRANSISTOR COUNT: 269 TRANSISTOR COUNT: 269 SUBSTRATE IS INTERNALLY CONNECTED TO V+ SUBSTRATE IS INTERNALLY CONNECTED TO V+ 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 © 1994 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.