19-0921; Rev 1; 7/96 Dual Mode 5V/Programmable Micropower Voltage Regulators General Description The MAX663/664/666 CMOS voltage regulators have a maximum quiescent current of 12uA. They can be used either as 5 volt, fixed output regulators with no additional components, or can be adjusted from 1.3V to 16V using two external resistors. Fixed or adjustable operation is automatically selected via the Vs_e7 input. The MAX66X series, ideally suited for battery powered systems, has an input voltage range of 2 to 16.5V, an output current capability of 40mA, and can operate with low input-output differentials. Other features include current limiting and low power shut down. The MAX663 positive regulator and MAX664 negative regulator are both pin and electrically compatible with the ICL7663 and ICL7664 and can plug-in replace these devices, improving performance and MAKLM Features @ Dual Mode Operation: Fixed +5V or Adjustable from +1.3V to +16V ee Ordering Information Low Power CMOS: 12uA Max Quiescent Current 40mA Output Current, with Current Limiting Pin-Compatible Upgrade of ICL7663 and ICL7664 +2V to +16.5V Operating Range Low Battery Detector (MAX666) No Output Over-Shoot on Power Up eliminating the need for external resistors in 5V PART TEMP. RANGE PIN-PACKAGE applications. The MAX666 has a positive output and MAX663C/D 0C to +70C Dice includes on-chip low-battery detection circuitry. ; MAX663CPA OC to +70C 8 Lead Plastic DIP A pplications MAX663CSA 0C to +70C 8 Lead Small Outline MAX663EPA, -40C to +85C 8 Lead Plastic DIP Handheld Instruments - LCD Display Systems MAX663ESA -40C to +85C 8 Lead Small Outline Pagers a. Telemet MAX663MJA = -55C to +125C = 8 Lead CERDIP Feo ee iteguisition and Telemetry MAX664C/D___ C to +70C__Diice Long-life Battery Powered Systems MAX664CPA 0C to +70C 8 Lead Plastic DIP MAX664CSA 0C to +70C 8 Lead Small Outline Pin Configuration MAX664EPA -40C to +85C 8 Lead Plastic DIP MAX664ESA -40C to +85C 8 Lead Small Outline Top View MAX664MJA -55C to +125C 8 Lead CERDIP MAX666C/D 0C to +70C Dice SENSEI = ~s Ee) vw (P08) MAX666CPA OCto+70C -B Lead Plastic DIP Vout2 2] anaxian [2 Ve MAX666CSA OPC to +70C 8 Lead Small Outline Vours BY -MAX663 5) veer MAX666EPA -40C to +85C 8 Lead Plastic DIP GND BEL MAX666ESA -40C to +85C 8 Lead Small Outline MAX666MJA -55C to +125C 8 Lead CERDIP voure of? "bana SENSE 2D Anas [2 Your SHDN Gl MAX664 gi VSET - 7 (NEG) Vin Ce PS) SHON Typical Operating Circuit sense ] ~~] in (Ps) ct sews on Vout 2) Anaxim [2] LB0 av = mania on LBI[s] MAX666 Te) Veer BATTERY T MAX663 GNO [4] sq SHON = GND VseT SHON LJ] MAAXLAA Maxim Integrated Products For free samples & the latest literature: http:/;~www.maxim-ic.com, or phone 1-800-998-8800 999XVW/P99OXVW/ES9OXUWMAX663/MAX664/MAX666 Dual Mode 5V/Programmable Micropower Voltage Regulators ABSOLUTE MAXIMUM RATINGS MAX663 and MAX666 ALL DEVICES Input Supply Voltage ........ ccc eee cece eee neues +18V Power Dissipation Terminal Voltage Plastic DIP (Derate 8.3mW/C above +50C) ........ 625mW Pins 1,3,5,6, MAX663 Pin 7, Small Outline (Derate 6MW/C above +50C) ....... 450mWw and MAX666 Pin 2, ............ GND -0.3V to Viy +0.3V CERDIP (Derate 8mMW/C above +50C) ........... 800mW MAX663 Pin2 ............005 GND -0.3V to Voyq; +0.3V Operating Temperature Range MAXG666 Pin 7 ........ eee eee eee GND -6.3V to +16.5V MAXEEXG 20. eee eee et nes OC to +70C Output Source Current MAX66XE 2... eee ene eee -40C to +85C MAX663,666 Pin 2 (Vouta: Vout) --.e cece eee cece eee 50mA MAX66XM ..... 2.0.0 -65C to +125C MAX663 PIN 3 (Voyt1) oo eee cece eee ences 25mA Storage Temperature .... 0... cece cece ee -65C to +150C Output Sink Current, PIN 7 2.0... cece cece cee eee -20mA Lead Temperature (Soldering 10 seconds) ...........-. +300C MAX664 Input Supply Voltage ....... cece eee ee eee eee -18V Terminal Voltage Pins 1,3,5,6,7 ........ 2... cece ee eees Vin -0.3V to GND +0.3V Pind ooo cece eee Vin -0.3V to Voy, +0.3V Output Sink Current, (Pins 1,7) ........... 0.0.0. eee -25mA Stresses above 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 above 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, MAX663 AND MAX666 (Vig = +9, Vour = +5V, Ta = +25C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MiN TYP MAX UNITS Over Temperature (C} 2.0 16.5 Vv Input Voltage Vin Over Temperature (E, M) 2.2 No Load, Vin = +16.5V , Ta = +25C 6 12 Quiescent Current lg Over Temperature (C) 15 BA Over Temperature (E, M) 20 Veer = GND Output Voltage Vout Over Temperature (C, E) 4.75 5.0 5.25 Vv Over Temperature (M) 4.5 5.0 5.5 Line Regulation AVout/AVin +2V <= Vin = +15V, Vout = Var 9.03 0.35 %/V MAX663: 1MA < loyjto < 20MA 3.0 7.0 Load Regulation AVour/Alout MAX663: 50nA < lout, = SMA 1.0 5.0 9 MAX666: 1MA < Igy7 S 20MA 3.0 7.0 Reference Voltage Vser Vout = Vser 1.27 1.33 V Reference Tempco. We_7/AT Over Temperature 100 ppm/C Vger Internal Threshold for Vv Ver < Viva for +5V Out 50 mv Fixed +5V or Adjustable Output f/A Vset > Veva for Adjustable Out Over Temperature (C, E) +0.01 +10 nA Vser Input Current Iser Over Temperature (M) +25 Vsypn HI = Output Off 1.4 Shutdown Input Voltage VsHDN VsHpn LO = Output On 03 Vv Shutdown Input Current IsHDN +0.01 +10 nA SENSE Input Threshold Vout - Vsense Current Limit Threshold 0.5 Vv SENSE Input Resistance Rsense 3 Mo Input-Output Saturation R vin toy jour - uA O 80 2 i - SAT IN = F939, Tout = Resistance, MAX683 - Voy74 Vin = +15V, louy = SMA 50 150 Output Current, Voyte | +3V < Vin = +16.5V 40 mA (Vout on MAX666) OUT Vin ~ Vout = +1.5V ' Ta = +25C 1.0 Minimum Load Current ILiMiN) Over Temperature (C, E) 5.0 nA Over Temperature (M) 10.0 MMAAL/WVIELECTRICAL CHARACTERISTICS, MAX663 AND MAX666 (continued) Dual Mode 5V/Programmable Micropower Voltage Regulators (Vin = +9V, Vout = +t5V, Ta = +25C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS LBI Input Threshold Visi MAX666 1.21 1.28 1.37 V LBI Input Current ler MAX666 +0.01 +10 nA LBO Output Saturation . Resistance Rgar MAX666, Isa7 = 2MA 35 100 a LBO Output Leakage Current MAX666, LBI = +1.4V 10 nA Vico Open-Circuit Voltage (Note 1) Vic MAX663 0.9 V Vr Sink Current (Note 1) Itc MAX663 8.0 2.0 mA Vrc Temperature Coefficient (Note 1) MAX663 +25 mv/C Note 1: This output (MAX663 only) has a positive temperature coefficient. Using it in conjunction with the input of the regulator at Vs-7, a negative coefficient results in the output voltage. The V7_ pin will not source current. ELECTRICAL CHARACTERISTICS, MAX664 (Vin = -9V, Vout = -5V, Ta = +25C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Over Temperature (C) -2.0 -16.5 Input Voltage Vin Over Temperature (E, M) -2.2 V No Load, Vy = -16.5V ; Ty = +25C 6 12 Quiescent Current le Over Temperature (C) 15 BA Over Temperature (E, M)} 20 Vset = GND Output Voltage Vout Over Temperature (C, E) -4.75 -5.0 -5.25 Vv Over Temperature (M} -45 -5.0 -6.5 Line Regulation AVour/ Vin -2V = Viy -15V, Vout = Vaer 0.03 0.35 %/V : Vout2 connected to Voy. Load Regulation AVout/Alout IMA S logy < 15MA 2.0 5.0 2 Reference Voltage Vser Vout = Vser -1.27 -1.33 v Reference Tempco. AVg_e7/AT Over Temperature +100 ppm/C Ver Internal Threshold for . Fixed -5V or Adjustable Vea VS VA IT out out -50 mv Output Operation SET "FA Vser Input Current Iser Over Temperature (C, E) +0.01 +10 nA Over Temperature (M) +25 VsHpn HI = Output Off -1.4 Shutdown Input Voltage VsHON Venpy LO = Output On 03 Shutdown Input Current IsHON 0.01 #10 nA SENSE Input Threshold Vout - Vsense | Current Limit Threshold -0.6 V SENSE Input Resistance Rsense 3 Mn ; Vout2 connected to Vout, Input-Output Saturation R Vin = -2V, lout = -1mA 150 500 0 Resistance SAT Vin = -9V, loyy = -2mMA 40 80 Vin = -15V, lour =-5mA 30 60 . Ty = +25C -1.0 Minimum Load Current I ewiny Over Temperature (C, E) -5.0 pA Over Temperature (M) -10.0 MAXI/VI 999XVAN/P99XVW/ES9XVANMAX663/MAX664/MAX666 Dual Mode 5V/Programmable Micropower Voltage Regulators Typical Operating Characteristics MAX663 Vours MAX663 VouT2, MAX666 VoUT MAX664 INPUT-OUTPUT DIFFERENTIAL INPUT-OUTPUT DIFFERENTIAL INPUT-OUTPUT DIFFERENTIAL vs. OUTPUT CURRENT vs. OUTPUT CURRENT vs. OUTPUT CURRENT Ta = 425C Ta=+25C; Ta = +25C AND Vout2 Vin =-2V s Vin = +2V = CONNECTED = = = 4+2V 5 i | i \ Vin = +9V F Z # 1 = = = Vin = +15V Vin = +15V 02 4 6 8 0 2 4 16 8 2 050 56 DONS O & 0 6 12 18 24 x tours (mAl lout (mA] laut (mA) QUIESCENT CURRENT QUIESCENT CURRENT INPUT POWER SUPPLY vs. INPUT VOLTAGE vs. TEMPERATURE REJECTION RATIO 2 i T . 10 Ta=+25C Vin| = +16V 00 6 10 \Vourl = +5V4 . MAX663, 66 =+9V Ta=+25C AVIN = +2V 8 PK 70 = +5V = _ ow Ta = +25C 3 VouT = +5 = ae g = a ~ 5 Vout = VREF 4 x 2 20 10 0 . 0 80 25 a 2 50 vt) 100 O01 al 10 100 joo 1k TEMPERATURE (C) FREQUENCY [Hz] Pin Description NAME FUNCTION (See text for details) Va Len T 2 a> Youre (P03) - > Vout Vout (1342) Regulator Output(s) Vv Regulator Input IN egulator Inpu sense SENSE Current limit sense input LBI Low battery detection input LBO Low battery detection output 5 SHUTDOWN | Disables output for minimum power SHUTDOWN >| Fa Veer consumption l , 1.3 Ground this pin for 5V output or 3 REF amv} Az We Vser Connect to external resistive divider for 4 T adjustable output GND Vv Temperature-proportional voltage TG for negative TC output Figure 1. MAX663 Positive Regulator, Block Diagram 4 MAXIDual Mode 5V/Programmable Micropower Voltage Regulators 4 we Voutz eel | aa Vin : = Vour (POS) + a Yours if aev SENSE SENSE cz 6 s LNT" SHUTOOWN >| ae ~ T 7 35 Leo SHUTDOWN >4 8 ver 3 | a> ] 4 4 . -LW GND I > REF gND | Figure 2. MAX664 Negative Regulator, Block Diagram Figure 3. MAX666 Positive Regulator With Low Battery Detector, Biock Diagram Detailed Description The MAX666 has a third comparator, C3, which As shown in the block diagrams for each device (Figures 1, 2, and 3), the main elements of the MAX66X family of regulators are a micropower bandgap reference, an error amplifier, and one or two series pass output devices. A P-channel FET and an NPN transistor are used on the MAX663, two N-channel FETs are used in the MAX664 , and one NPN output transistor is used in the MAX666. All regulators also contain two comparators, one for current limiting (C1) and another which selects fixed 5V or adjustable output operation (C2). The bandgap reference, which is trimmed to 1,30V +30mvV, is internally connected to one input of the error amplifier, Al. The feedback signal from the regulator output is supplied to the A1s other input by either an on-chip voltage divider or by two external resistors. When Vse7 is grounded the internal divider provides the error amplifiers feed- back signal for a fixed 5V output. When Vs_q7 is more than 50mV above ground (below ground for the MAX664) the error amplifiers input is switched directly to the Vge7 pin and external resistors set the output voltage. Comparator C1 monitors the output current via the SENSE input and shuts down the regulators out- put(s) by disabling A1. An external current sense resistor, Rot, sets the limit value. The MAX663 and MAX666 current-limit when the voltage on Re, exceeds 0.5V. The MAX664 current limits at 0.6V. The MAX663 has an additional amplifier, A2, which provides a temperature-proportional output, Vyc. When this is summed into the inverting input of the error amplifier, a negative temperature coefficient results at the output. This is useful when powering liquid crystal displays over wide temperature ranges. MAAINI compares the LBI input to the internal 1.30V ref- erence. The Low Battery Output, LBO, is an open drain FET connected to Ground. The Low Battery threshold can also be set with a voltage divider at LBI. In addition, all devices also have a SHUT- DOWN input. which disables the error amplifier and regulator output(s). Basic Circuit Operation Figure 4 shows the connections for fixed 5V output positive and negative regulators. The Vs_er input is grounded and no external resistors are required. Figure 5 shows adjustable output operation with current limiting. The output voltage is set by R1 and R2 and the current limit threshold is set by Rei: Vout should be connected to SENSE if current limiting is not used and the SHUTDOWN input should be grounded if not used. Output Voltage Selection If Vser is not connected to Ground, the output voltage is set by the equation: R1+R2 Vout = Vset * Ri? where Vs_er = 1.30V or, to simplify resistor selection: VouT 1.30V Since the input bias current at Vge7 has a maxi- mum value of 10nA, relatively large values can be used for R1 and R2 with no loss of accuracy. IMO is a typical value for R1. The tolerance on Vc_q is guaranteed to be less than +30mV. This allows the output to be preset without trim pots, using only fixed resistors in most cases. Re = Ri x ( 1) 999XVW/P99XVW/ES9OXVNMAX663/MAX664/MAX666 Dual Mode 5V/Programmable Micropower Voltage Regulators a 1 +6V 70 +16 >] Vin SENSE INPUT 2 | 5V louTz + PIN 3,7 = WC. MAXIM OUTPUT MAX663 MAX666 GNO ger SHON 4 | 6 5 5 4 2 6V TO -16v >| Yin SENSE INPUT 7 Vout | ~5V MAXIM 1 OUTPUT MAX664 Youre GND Vser SHON 8| a! }3.5 8 1 +20 TO +16 | Vin SENSE a 5 Youre PAWAgee 113 10 +180 = 130 = ON | SHON A AL Ro, | (ouTPUT om= MAX663 3 Re MAX666 fi PIN 3, 7 = WE. Veer a S al < 4 Zz RI +A2 Wut! =100 Rl y 4 2 2V TO -16V 4 Vin SENSE (NPUT A >-03V=0N 35 Your aoa 1.3 TO -15 <-14 = OFF | SHON Vourz Ac | OUTPUT maxim |! > kz MAX664 4 v = - Sm 3 > +! & Figure 4. Connections for Fixed 5V Output Current Limiting Internal current limiting is activated on all MAX66X devices when the voltage difference between Voyt and the SENSE input exceeds an internal threshold. The limit value is externally set by Rc, using the equation: Ra, = Ver Ver = 0.5V for MAX663 and MAX666 CL low Vo. = -0.6V for MAX664 (VoL = Vout - Vsense) where Re, is the current limit sense resistor and Ic. is the maximum current. Re, should be chosen so that neither the 50mA absolute maximum output current specification nor the maximum power dis- sipation is exceeded. lf current limiting is used, remember that the addi- tional voltage drop across Re_ must be considered when determining the regulator's dropout voltage. If current limiting is not used, the SENSE input should be connected to the output(s). Shutdown Input The SHUTDOWN input allows the regulator to be turned off with a logic level signal. Since the current drain in shutdown mode is limited to the regulators quiescent current (124A Max) this is sometimes desirable in applications where very low power consumption is needed. The SHUTDOWN input Figure 5. Connections for Adjustable Output should be driven with a CMOS logic level since the input threshold is only 0.3V (-0.3V on the MAX664). In TTL systems, an open-collector driver with a pullup resistor will work with the MAX663/666 if a small collector current is used to keep the outputs Vsat below 0.3V. Collector currents as low as 1A are suitable since the SHUTDOWN pins input current is less than 10nA. Note that the MAX664s SHUTDOWN input is activated by a negative level. On both positive and negative regulators the SHUTDOWN input should be grounded for normal operation. Low Battery Detection The MAX666 contains on-chip circuitry for low battery or iow power supply detection. If the voltage at LBI (Low Battery Input, pin 3) falls below the regulator's internal reference (1.30V) then LBO (Low Battery Output, pin 7), an open drain output, goes low. The threshold can be set to any level above the reference voltage by connecting a resistive divider to LBI (Figure 6} based on the equation: VBATT = x -- R3 = R4 G30 1) where Veatt is the desired threshold of the Low Battery Detector and R3 and R4 are the LBI input divider resistors. Since LBIs input current is no more than 10nA, then R3 and R4 can have high MMAXI/VIDual Mode 5V/Programmable Micropower Voltage Regulators +20 70-+10V ~"d vy sense | wT se Vout Lea Adem +13 TO +154 an is MAxim he $n ouTPUT <i = 5] ow MAX666 var ($ ? > La = : > 7 ,. LOW BATTERY 3 any {BO $7 auteur aL Ti oa = = 1 a3 +A4 Vuonatt = 1.300 y AZ, Re wv aN Vour = Vger(l + py) + pg lser Yrel - a3 Rz Te Nut =~ gar [TC Wye) IW mvs C Mn Pom our TC MOUT= ag LTE Wicd tue ey - We = Var t r WHERE Vey = 1.30V Vip = Of Te Vrg = +2.5m0/C Figure 6. Adjustabie Positive Output With Low Battery Detection values to minimize loading. If, for example, Vout were 5V, then a 6V low-battery threshold could be set using 10M for R3 and 2.7MO for R4. When megohm resistor values are used, special attention should be paid to PC board leakage which can introduce error at the LBI input. Temperature-Proportional Output The Vrc output (MAX663 only) has a positive temperature coefficient of about +2.5mV/C. When connected to the summing junction of the error amplifier (Vset) through a resistor, this positive coefficient results in a controllable negative tem- perature coefficient at the output of the MAX663. At 25C the voltage at the Vrc output is typically 0.9V. Figure 7 shows a simplified diagram of the MAX663 and the equations for setting both the output voltage and the tempco when Vy is used. When not used, Vre should be left unconnected. Negative output temperature coefficients are most commonly used in multiplexed LCD modules or display systems to compensate for the inherent negative tempco of the LCD threshold. Figure 8 shows a MAX663 generating a temperature compensated Volsp for the Maxim |CM7233 triplexed LCD display river. Application Hints Input-Output (Dropout) Voltage A regulator's minimum input-output differential, or dropout voltage, determines the lowest usable input voltage. In battery powered systems this will determine the useful end-of-life battery voltage. The MAX663 and MAX666 have a dropout voltage of 1V at full output. This means that as 5V regulators, for example, they will provide a regulated 5V output at 40mA as long as the input voltage is 6V or greater. For low current applications (loyt < 5mA) the MAX663 can operate with input-output differentials below 1V when Voy is used. The dropout voltage will then depend on the P-channel output FETs saturation resistance multiplied by the joad current (see MAX663 Electrical Specifications, Rsat). MAXIM Figure 7. Temperature-Proportional Output Equations, MAX663 The MAX664 (negative output) uses two N-channel FETs as output devices so its dropout voltage is also a function of Rgat times its load current (see Electrical Specifications). Gutput Connections When using Vout: on the MAX663 for low current, low dropout applications, Voyt2 and Vout; must be connected together since the current limit circuitry is referenced only to Vout2 (Figure 1). Vout2 does net supply load current in this configuration since the base of the NPN output transistor is shorted by the output connection. For high current operation Voute should be used alone and Vout; should be left un- connected. VouT1 is not provided on the MAX666. On the MAX664, Vout: and Vout2 should always be connected together for proper operation and lowest dropout voltage. +8 0 Vw Veuri os ee] | ES I af ea} ee | ] Veet MAXIM ie. Vrefonty =| MAX7233 ao | maz 4 | usr i an ~ OATABUS 5 P YIN] DA PKI EKIE K MUXD LCO DISPLAY Figure 8. Driving a Multiplexed LCD Display. Consistent operation over more than 40C temperature span, as opposed to about 10C with fixed drive voltage, is allowed by negative temperature coetficient drive voltage to the displays. Based on EPSON LDB-728 Display or equivalent. 999XVW/P99OXVW/ESOXVANMAX663/MAX664/MAX666 Dual Mode 5V/Programmable Micropower Voltage Regulators IT wen, It Ss vw Vourt |2 1 enazsr S40" rac axe > +f SET + tOnF >R MAXIM 2 WF MAX663 eure ww 3 MAXeGe Yours | ; ae Sa) twee ens SHUTDOWN > sau SENSE | 0 +5y QUTPUT WOuF SENSE eno Var d, ; COSA vin T th 5 OUTPUT = = . 2N403 6A Figure 9. Positive Regulator With Boosted Output, Current Limit, Figure 10. Negative Regulator With Boosted Output and Low and Low Ig Shutdown ig Shutdown i. LOBATT @7 7 (BO sense F a 2 fe + Vn SAAXIM Your AN > +5V | 8 > MAX666 vast se Paka ot - + r hoa, | anaxian tL tegat ? LBL GWG SHON. Vasey = luk = L oF 1cL7660 |, aout Js Ta Js Jo caP- > AR oe ano |? | 3 a70K22 I a [3 6 at Sy. 0047 F GMO SHDN Veer | | +f FE out Vourt 7 4 1] Fa 0 Vik WMIAKIAA Nutz Lear > -5Y MAX664 270 SENSE 2 Figure 11. +5V Pawer Supply Using One 9V Battery Bypass Capacitors Chip Topography The MAX66X series of CMOS regulators is designed primarily for low quiescent current battery powered _ 3 a systems and has limited line and load regulation at , frequencies above 10Hz. The high frequency perfor- mance is easily improved by adding an output filter Capacitor across the load. 10uF is a good typical = value. If high frequency performance is not an issue : then an output bypass capacitor is not required. 0.064" In battery powered systems an input capacitor helps (1ESoe to reduce noise, improve dynamic performance, and reduce the input rate-of-rise at the regulator's input. in extreme cases excessive voltage rate-of-rise at the inputs of CMOS devices can cause SCR latch-up. The low impedance of Ni-Cad and Lead-Acid batteries | _ make this possible when they are switched directly to | z 8 4 the regulator input with no current limiting resistance, < 0.082" > inductance, or input filtering. The addition of a O.1yF (2.0enm) or greater input capacitor limits the input rate-of-rise (See Pin Contigurations (front page) for pin functions) to a safe level. 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. 8 Maxim integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 {408} 737-7600 1996 Maxim Integrated Products Printed USA MAXIM is a registered trademark of Maxim Integrated Products.