LMC7101 Tiny Low Power Operational Amplifier with Rail-To-Rail Input and Output General Description Features The LMC7101 is a high performance CMOS operational amplifier available in the space saving SOT 23-5 Tiny package. This makes the LMC7101 ideal for space and weight critical designs. The performance is similar to a single amplifier of the LMC6482/4 type, with rail-to-rail input and output, high open loop gain, low distortion, and low supply currents. The main benefits of the Tiny package are most apparent in small portable electronic devices, such as mobile phones, pagers, notebook computers, personal digital assistants, and PCMCIA cards. The tiny amplifiers can be placed on a board where they are needed, simplifying board layout. n Tiny SOT23-5 package saves space — typical circuit layouts take half the space of SO-8 designs n Guaranteed specs at 2.7V, 3V, 5V, 15V supplies n Typical supply current 0.5 mA at 5V n Typical total harmonic distortion of 0.01% at 5V n 1.0 MHz gain-bandwidth n Similar to popular LMC6482/4 n Input common-mode range includes V− and V+ n Tiny package outside dimensions — 120 x 118 x 56 mils, 3.05 x 3.00 x 1.43 mm Applications n n n n Mobile communications Notebooks and PDAs Battery powered products Sensor interface Connection Diagram 5-Pin SOT23-5 DS011991-2 Top View Package 5-Pin SOT 23-5 Ordering Information NSC Drawing Number Package Marking Supplied As LMC7101AIM5 MA05A A00A 1k Units on Tape and Reel LMC7101AIM5X MA05A A00A 3k Units Tape and Reel LMC7101BIM5 MA05A A00B 1k Units on Tape and Reel LMC7101BIM5X MA05A A00B 3k Units Tape and Reel © 1999 National Semiconductor Corporation DS011991 www.national.com LMC7101 Tiny Low Power Operational Amplifier with Rail-To-Rail Input and Output September 1999 Absolute Maximum Ratings (Note 1) Storage Temperature Range Junction Temperature (Note 4) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance (Note 2) Difference Input Voltage Voltage at Input/Output Pin Supply Voltage (V+ − V−) Current at Input Pin Current at Output Pin (Note 3) Current at Power Supply Pin Lead Temp. (Soldering, 10 sec.) −65˚C to +150˚C 150˚C Recommended Operating Conditions (Note 1) 2000V ± Supply Voltage Supply Voltage Junction Temperature Range LMC7101AI, LMC7101BI Thermal Resistance (θJA) M05A Package, 5-Pin Surface Mt. (V+) + 0.3V, (V−) − 0.3V 16V ± 5 mA ± 35 mA 35 mA 260˚C 2.7V ≤ V+ ≤ 15.5V −40˚C ≤ TJ ≤ +85˚C 325˚C/W 2.7V Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.7V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ. Boldface limits apply at the temperature extremes. Symbol VOS Parameter Input Offset Voltage Conditions V+ = 2.7V Typ LMC7101AI (Note 5) Limit Limit (Note 6) (Note 6) 6 9 0.11 LMC7101BI Units mV max TCVOS Input Offset Voltage 1 µV/˚C Average Drift IB Input Bias Current 1.0 64 64 pA max IOS Input Offset Current 0.5 32 32 pA max RIN Input Resistance >1 CMRR Common-Mode 55 50 Input Common-Mode 0V ≤ VCM ≤ 2.7V V+ = 2.7V V+ = V Voltage Range For CMRR ≥ 50 dB Rejection Ratio VCM 70 Tera Ω dB min 0.0 0.0 0.0 V min 3.0 2.7 2.7 V max PSRR Power Supply Rejection Ratio CIN V+ = 1.35V to 1.65V V− = −1.35V to −1.65V VCM = 0 Common-Mode Input dB 60 50 45 3 min pF Capacitance VO Output Swing RL = 2 kΩ RL = 10 kΩ IS Supply Current SR Slew Rate GBW Gain-Bandwidth Product (Note 8) 2.45 2.15 2.15 V min 0.25 0.5 0.5 V max 2.68 2.64 2.64 V min 0.025 0.06 0.06 V max 0.5 0.81 0.81 mA 0.95 0.95 max 0.7 V/µs 0.6 MHz 3V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 3V, V− = 0V, VCM = 1.5V, VO = V+/2 and RL = 1 MΩ. Boldface limits apply at the temperature extremes. Symbol VOS www.national.com Parameter Conditions Input Offset Voltage Typ LMC7101AI (Note 5) Limit Limit (Note 6) (Note 6) 4 7 0.11 2 LMC7101BI Units mV 3V DC Electrical Characteristics (Continued) Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 3V, V− = 0V, VCM = 1.5V, VO = V+/2 and RL = 1 MΩ. Boldface limits apply at the temperature extremes. Symbol TCVOS Parameter Conditions Input Offset Voltage Typ LMC7101AI (Note 5) Limit LMC7101BI Limit (Note 6) (Note 6) 6 9 1 Units max µV/˚C Average Drift IB Input Current 1.0 64 64 pA max IOS Input Offset Current 0.5 32 32 pA max RIN Input Resistance >1 CMRR Common-Mode 64 60 Rejection Ratio VCM 0V ≤ VCM ≤ 3V V+ = 3V 74 db min Input Common-Mode Voltage Range Tera Ω 0.0 0.0 0.0 For CMRR ≥ 50 dB V min 3.3 3.0 3.0 V max PSRR Power Supply Rejection Ratio CIN V+ = 1.5V to 7.5V V− = −1.5V to −7.5V VO = VCM = 0 dB 80 Common-Mode Input 68 60 3 min pF Capacitance VO Output Swing RL = 2 kΩ RL = 600Ω IS Supply Current 3 2.8 2.6 2.6 V min 0.2 0.4 0.4 V max 2.7 2.5 2.5 V min 0.37 0.6 0.6 V max 0.5 0.81 0.81 mA 0.95 0.95 max www.national.com 5V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VCM = 1.5V, VO = V+/2 and RL = 1 MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Input Offset Voltage VOS TCVOS Conditions V+ = 5V Typ LMC7101AI (Note 5) Limit Limit (Note 6) (Note 6) 0.11 Input Offset Voltage LMC7101BI Units 3 7 mV 5 9 max 1.0 µV/˚C Average Drift IB Input Current 1 64 64 pA max IOS Input Offset Current 0.5 32 32 pA max RIN Input Resistance >1 CMRR Common-Mode 65 60 db 60 55 min 70 65 dB 65 62 min 70 65 dB 65 62 min −0.20 −0.20 V 0.00 0.00 min 0V ≤ VCM ≤ 5V Tera Ω 82 Rejection Ratio +PSRR Negative Power Supply V+ = 5V to 15V V− = 0V, VO = 1.5V V− = −5V to −15V Rejection Ratio V+ = 0V, VO = −1.5V Input Common-Mode For CMRR ≥ 50 dB Positive Power Supply Rejection Ratio −PSRR VCM 82 82 −0.3 Voltage Range 5.3 CIN Common-Mode 5.20 5.20 V 5.00 5.00 max 3 pF Input Capacitance VO Output Swing RL = 2 kΩ 4.9 0.1 RL = 600Ω 4.7 0.3 ISC Output Short Circuit Sourcing, VO = 0V 24 Current Sinking, VO = 5V IS 19 Supply Current 0.5 4.7 4.7 V 4.6 4.6 min 0.18 0.18 V 0.24 0.24 max 4.5 4.5 V 4.24 4.24 min 0.5 0.5 V 0.65 0.65 max 16 16 mA 11 11 min 11 11 mA 7.5 7.5 min 0.85 0.85 mA 1.0 1.0 max 5V AC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VCM = 1.5V, VO = V+/2 and RL = 1 MΩ. Boldface limits apply at the temperature extremes. Symbol T.H.D. Parameter Total Harmonic Distortion Conditions F = 10 kHz, AV = −2 RL = 10 kΩ, VO = 4.0 VPP Typ LMC7101AI (Note 5) Limit Limit (Note 6) (Note 6) 0.01 LMC7101BI Units % SR Slew Rate 1.0 V/µs GBW Gain__Bandwidth Product 1.0 MHz www.national.com 4 15V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 15V, V− = 0V, VCM = 1.5V, VO = V+/2 and RL = 1 MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ LMC7101AI (Note 5) Limit LMC7101BI Limit (Note 6) (Note 6) Units VOS Input Offset Voltage 0.11 mV max TCVOS Input Offset Voltage 1.0 µV/˚C Average Drift IB Input Current 1.0 64 64 pA max IOS Input Offset Current 0.5 32 32 pA max RIN Input Resistance >1 CMRR Common-Mode 70 65 dB 65 60 min 70 65 dB 65 62 min 70 65 dB 65 62 min −0.20 −0.20 V 0.00 0.00 min 15.20 15.20 V 15.00 15.00 max 80 80 V/mV 40 40 15 15 0V ≤ VCM ≤ 15V 82 Rejection Ratio +PSRR Positive Power Supply Rejection Ratio −PSRR Negative Power Supply 82 82 Input Common-Mode V+ = 0V, VO = −1.5V V+ = 5V Voltage Range For CMRR ≥ 50 dB Rejection Ratio VCM V+ = 5V to 15V V− = 0V, VO = 1.5V V− = −5V to −15V −0.3 15.3 AV Large Signal RL = 2 kΩ Voltage Gain (Note 7) Sourcing Sinking RL = 600Ω (Note 7) CIN Input Capacitance VO Output Swing 340 24 10 300 34 34 Sinking 15 6 6 14.4 14.4 V 14.2 14.2 min 3 V+ = 15V RL = 2 kΩ 14.7 V+ = 15V RL = 600Ω 14.1 0.5 Output Short Circuit Sourcing, VO = 0V Current (Note 9) 50 Sinking, VO = 12V 50 (Note 9) IS 10 Sourcing 0.16 ISC Tera Ω Supply Current 0.8 5 V/mV pF 0.32 0.32 V 0.45 0.45 max 13.4 13.4 V 13.0 13.0 min 1.0 1.0 V 1.3 1.3 max 30 30 mA 20 20 min 30 30 mA 20 20 min 1.50 1.50 mA 1.71 1.71 max www.national.com 15V AC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 15V, V− = 0V, VCM = 1.5V, VO = V+/2 and RL = 1 MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ LMC7101AI (Note 5) Limit Limit (Note 6) (Note 6) Slew Rate V+ = 15V GBW Gain-Bandwidth Product (Note 8) V+ = 15V φm Gm en Input-Referred F = 1 kHz Voltage Noise VCM = 1V Input-Referred F = 1 kHz 1.5 F = 10 kHz, AV = −2 RL = 10 kΩ, VO = 8.5 VPP 0.01 SR in 1.1 LMC7101BI 0.5 0.5 0.4 0.4 Units V/µs min 1.1 MHz Phase Margin 45 Deg Gain Margin 10 dB 37 Current Noise T.H.D. Total Harmonic Distortion % Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics. Note 2: Human body model, 1.5 kΩ in series with 100 pF. Note 3: Applies to both single-supply and split-supply operation. Continuous short operation at elevated ambient temperature can result in exceeding the maximum allowed junction temperature at 150˚C. Note 4: The maximum power dissipation is a function of TJ(max), θJA and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(max) − TA)/θJA. All numbers apply for packages soldered directly into a PC board. Note 5: Typical Values represent the most likely parametric norm. Note 6: All limits are guaranteed by testing or statistical analysis. Note 7: V+ = 15V, VCM = 1.5V and RL connect to 7.5V. For Sourcing tests, 7.5V ≤ VO ≤ 12.5V. For Sinking tests, 2.5V ≤ VO ≤ 7.5V. Note 8: V+ = 15V. Connected as a Voltage Follower with a 10V step input. Number specified is the slower of the positive and negative slew rates. RL = 100 kΩ connected to 7.5V. Amp excited with 1 kHz to produce VO = 10 VPP. Note 9: Do not short circuit output to V+ when V+ is greater than 12V or reliability will be adversely affected. www.national.com 6 Typical Performance Characteristics VS = +15V, Single Supply, TA = 25˚C unless specified 2.7V PERFORMANCE Open Loop Frequency Response (2.7V) Input Voltage vs Output Voltage (2.7V) DS011991-16 Gain and Phase vs Capacitance Load (2.7V) Gain and Phase vs Capacitance Load (2.7V) DS011991-17 dVOS vs Supply Voltage dVOS vs Common Mode Voltage (2.7V) DS011991-20 DS011991-19 Sinking Current vs Output Voltage (2.7V) DS011991-18 DS011991-21 Sourcing Current vs Output Voltage (2.7V) DS011991-22 DS011991-23 7 www.national.com Typical Performance Characteristics Single Supply, TA = 25˚C unless specified 3V PERFORMANCE Open Loop Frequency Response (3V) Input Voltage vs Output Voltage (3V) DS011991-25 DS011991-24 Sourcing Current vs Output Voltage (3V) Input Voltage Noise vs Input Voltage (3V) Sinking Current vs Output Voltage (3V) DS011991-26 CMRR vs Input Voltage (3V) DS011991-29 DS011991-27 DS011991-28 5V PERFORMANCE Open Loop Frequency Response (5V) Input Voltage vs Output Voltage (5V) Input Voltage Noise vs Input Voltage (5V) DS011991-31 DS011991-30 DS011991-32 www.national.com 8 5V PERFORMANCE (Continued) Sourcing Current vs Output Voltage (5V) Sinking Current vs Output Voltage (5V) CMRR vs Input Voltage (5V) DS011991-35 DS011991-33 DS011991-34 Typical Performance Characteristics Open Loop Frequency Response (15V) VS = +15V, Single Supply, TA = 25˚C unless specified Input Voltage vs Output Voltage (15V) Input Voltage Noise vs Input Voltage (15V) DS011991-36 DS011991-37 Sourcing Current vs Output Voltage (15V) Sinking Current vs Output Voltage (15V) DS011991-38 CMRR vs Input Voltage (15V) DS011991-41 DS011991-39 DS011991-40 9 www.national.com Typical Performance Characteristics VS = +15V, Single Supply, TA = 25˚C unless specified (Continued) Supply Current vs Supply Voltage Input Current vs Temperature Output Voltage Swing vs Supply Voltage DS011991-42 Input Voltage Noise vs Frequency Positive PSRR vs Frequency Negative PSRR vs Frequency DS011991-45 CMRR vs Frequency DS011991-44 DS011991-43 DS011991-46 Open Loop Frequency Response @ −40˚C DS011991-47 Open Loop Frequency Response @ 25˚C DS011991-48 DS011991-49 www.national.com 10 DS011991-50 Typical Performance Characteristics VS = +15V, Single Supply, TA = 25˚C unless specified (Continued) Open Loop Frequency Response @ 85˚C Maximum Output Swing vs Frequency DS011991-51 Gain and Phase vs Capacitive Load Gain and Phase vs Capacitive Load DS011991-52 Output Impedance vs Frequency DS011991-54 DS011991-53 Slew Rate vs Temperature DS011991-55 DS011991-56 Slew Rate vs Supply Voltage Inverting Small Signal Pulse Response Inverting Small Signal Pulse Response DS011991-58 DS011991-57 11 DS011991-59 www.national.com Typical Performance Characteristics VS = +15V, Single Supply, TA = 25˚C unless specified (Continued) Inverting Small Signal Pulse Response Inverting Large Signal Pulse Response DS011991-60 Inverting Large Signal Pulse Response DS011991-61 Non-Inverting Small Signal Pulse Response DS011991-63 Non-Inverting Small Signal Pulse Response DS011991-64 Non-Inverting Large Signal Pulse Response DS011991-66 www.national.com Inverting Large Signal Pulse Response DS011991-67 12 DS011991-62 Non-Inverting Small Signal Pulse Response DS011991-65 Non-Inverting Large Signal Pulse Response DS011991-68 Typical Performance Characteristics VS = +15V, Single Supply, TA = 25˚C unless specified (Continued) Non-Inverting Large Signal Pulse Response Stability vs Capacitive Load Stability vs Capacitive Load DS011991-69 DS011991-70 Stability vs Capacitive Load Stability vs Capacitive Load DS011991-71 Stability vs Capacitive Load DS011991-75 DS011991-76 DS011991-77 Stability vs Capacitive Load DS011991-78 13 www.national.com Application Information 1.0 Benefits of the LMC7101 Tiny Amp Size. The small footprint of the SOT 23-5 packaged Tiny amp, (0.120 x 0.118 inches, 3.05 x 3.00 mm) saves space on printed circuit boards, and enable the design of smaller electronic products. Because they are easier to carry, many customers prefer smaller and lighter products. Height. The height (0.056 inches, 1.43 mm) of the Tiny amp makes it possible to use it in PCMCIA type III cards. Signal Integrity. Signals can pick up noise between the signal source and the amplifier. By using a physically smaller amplifier package, the Tiny amp can be placed closer to the signal source, reducing noise pickup and increasing signal integrity. The Tiny amp can also be placed next to the signal destination, such as a buffer for the reference of an analog to digital converter. Simplified Board Layout. The Tiny amp can simplify board layout in several ways. First, by placing an amp where amps are needed, instead of routing signals to a dual or quad device, long pc traces may be avoided. By using multiple Tiny amps instead of duals or quads, complex signal routing and possibly crosstalk can be reduced. Low THD. The high open loop gain of the LMC7101 amp allows it to achieve very low audio distortion — typically 0.01% at 10 kHz with a 10 kΩ load at 5V supplies. This makes the Tiny an excellent for audio, modems, and low frequency signal processing. Low Supply Current. The typical 0.5 mA supply current of the LMC7101 extends battery life in portable applications, and may allow the reduction of the size of batteries in some applications. Wide Voltage Range. The LMC7101 is characterized at 15V, 5V and 3V. Performance data is provided at these popular voltages. This wide voltage range makes the LMC7101 a good choice for devices where the voltage may vary over the life of the batteries. DS011991-8 FIGURE 1. An Input Voltage Signal Exceeds the LMC7101 Power Supply Voltages with No Output Phase Inversion DS011991-9 FIGURE 2. A ± 7.5V Input Signal Greatly Exceeds the 3V Supply in Figure 3 Causing No Phase Inversion Due to RI Applications that exceed this rating must externally limit the maximum input current to ± 5 mA with an input resistor as shown in Figure 3. 2.0 Input Common Mode Voltage Range The LMC7101 does not exhibit phase inversion when an input voltage exceeds the negative supply voltage. Figure 1 shows an input voltage exceeding both supplies with no resulting phase inversion of the output. The absolute maximum input voltage is 300 mV beyond either rail at room temperature. Voltages greatly exceeding this maximum rating, as in Figure 2, can cause excessive current to flow in or out of the input pins, adversely affecting reliability. DS011991-10 FIGURE 3. RI Input Current Protection for Voltages Exceeding the Supply Voltage 3.0 Rail-To-Rail Output The approximate output resistance of the LMC7101 is 180Ω sourcing and 130Ω sinking at VS = 3V and 110Ω sourcing and 80Ω sinking at VS = 5V. Using the calculated output resistance, maximum output voltage swing can be estimated as a function of load. 4.0 Capacitive Load Tolerance The LMC7101 can typically directly drive a 100 pF load with VS = 15V at unity gain without oscillating. The unity gain follower is the most sensitive configuration. Direct capacitive loading reduces the phase margin of op-amps. The combiwww.national.com 14 4.0 Capacitive Load Tolerance (Continued) nation of the op-amp’s output impedance and the capacitive load induces phase lag. This results in either an underdamped pulse response or oscillation. Capacitive load compensation can be accomplished using resistive isolation as shown in Figure 4. This simple technique is useful for isolating the capacitive input of multiplexers and A/D converters. DS011991-11 FIGURE 4. Resistive Isolation of a 330 pF Capacitive Load 5.0 Compensating for Input Capacitance when Using Large Value Feedback Resistors When using very large value feedback resistors, (usually > 500 kΩ) the large feed back resistance can react with the input capacitance due to transducers, photodiodes, and circuit board parasitics to reduce phase margins. The effect of input capacitance can be compensated for by adding a feedback capacitor. The feedback capacitor (as in Figure 5), Cf is first estimated by: or R1 CIN ≤ R2 Cf which typically provides significant overcompensation. Printed circuit board stray capacitance may be larger or smaller than that of a breadboard, so the actual optimum value for CF may be different. The values of CF should be checked on the actual circuit. (Refer to the LMC660 quad CMOS amplifier data sheet for a more detailed discussion.) DS011991-12 FIGURE 5. Cancelling the Effect of Input Capacitance 15 www.national.com SOT-23-5 Tape and Reel Specification TAPE FORMAT Tape Section # Cavities Cavity Status Cover Tape Status Leader 0 (min) Empty Sealed (Start End) 75 (min) Empty Sealed Carrier 3000 Filled Sealed 1000 Filled Sealed Trailer 125 (min) Empty Sealed (Hub End) 0 (min) Empty Sealed TAPE DIMENSIONS DS011991-13 8 mm Tape Size www.national.com 0.130 0.124 0.130 0.126 0.138 ± 0.002 0.055 ± 0.004 0.157 0.315 ± 0.012 (3.3) (3.15) (3.3) (3.2) (3.5 ± 0.05) (1.4 ± 0.11) (4) (8 ± 0.3) DIM A DIM Ao DIM B DIM Bo DIM F DIM Ko DIM P1 DIM W 16 SOT-23-5 Tape and Reel Specification (Continued) REEL DIMENSIONS DS011991-14 8 mm Tape Size 7.00 0.059 0.512 0.795 2.165 330.00 1.50 A B 13.00 20.20 55.00 C D 0.567 W1+ 0.078/−0.039 8.40 + 1.50/−0.00 14.40 W1 + 2.00/−1.00 W1 W2 W3 N • 6.0 SPICE Macromodel A SPICE macromodel is available for the LMC7101. This model includes simulation of: • • • • 0.331 + 0.059/−0.000 Input common-mode voltage range Frequency and transient response GBW dependence on loading conditions Quiescent and dynamic supply current 17 Output swing dependence on loading conditions and many more characteristics as listed on the macro model disk. Contact your local National Semiconductor sales office to obtain an operational amplifier spice model library disk. www.national.com LMC7101 Tiny Low Power Operational Amplifier with Rail-To-Rail Input and Output Physical Dimensions inches (millimeters) unless otherwise noted 5-Pin SOT Package Order Number LMC7101AIM5, LMC7101AIM5X, LMC7101BIM5 or LMC7101BIM5X NS Package Number MA05A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: [email protected] www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: [email protected] Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: [email protected] National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.