LM2984 Microprocessor Power Supply System General Description Features The LM2984 positive voltage regulator features three independent and tracking outputs capable of delivering the power for logic circuits, peripheral sensors and standby memory in a typical microprocessor system. The LM2984 includes circuitry which monitors both its own high-current output and also an external µP. If any error conditions are sensed in either, a reset error flag is set and maintained until the malfunction terminates. Since these functions are included in the same package with the three regulators, a great saving in board space can be realized in the typical microprocessor system. The LM2984 also features very low dropout voltages on each of its three regulator outputs (0.6V at the rated output current). Furthermore, the quiescent current can be reduced to 1 mA in the standby mode. Designed also for vehicular applications, the LM2984 and all regulated circuitry are protected from reverse battery installations or 2-battery jumps. Familiar regulator features such as short circuit and thermal overload protection are also provided. Fixed outputs of 5V are available in the plastic TO-220 power package. n n n n n n n n n n n n n n Three low dropout tracking regulators Output current in excess of 500 mA Fully specified for −40˚C to +125˚C operation Low quiescent current standby regulator Microprocessor malfunction RESET flag Delayed RESET on power-up Accurate pretrimmed 5V outputs Reverse battery protection Overvoltage protection Reverse transient protection Short circuit protection Internal thermal overload protection ON/OFF switch for high current outputs P+ Product Enhancement tested Typical Application Circuit DS011252-1 COUT must be at least 10 µF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to the regulator. This capacitor must be rated over the same operating temperature range as the regulator. The equivalent series resistance (ESR) of this capacitor is critical; see curve. Order Number LM2984T See NS Package Number TA11B © 1998 National Semiconductor Corporation DS011252 www.national.com LM2984 Microprocessor Power Supply System April 1998 Absolute Maximum Ratings (Note 2) Operating Temperature Range (TA) Maximum Junction Temperature (Note 3) Storage Temperature Range Lead Temperature (Soldering, 10 sec.) ESD Susceptability (Note 5) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage Survival Voltage ( < 100 ms) Operational Voltage Internal Power Dissipation 60V 26V Internally Limited −40˚C to +125˚C 150˚C −65˚C to +150˚C 230˚C 2000V Electrical Characteristics VIN = 14V, IOUT = 5 mA, COUT = 10 µF, unless otherwise indicated. Boldface type refers to limits over the entire operating temperature range, −40˚C ≤ TA ≤ +125˚C, all other limits are for TA = Tj = 25˚C (Note 8) . Parameter Conditions Typical Limit Units (Note 4) VOUT (Pin 11) Output Voltage 5 mA ≤ IO ≤ 500 mA 5.00 6V ≤ VIN ≤ 26V 4.85/4.75 Vmin 5.15/5.25 Vmax mVmax 9V ≤ VIN ≤ 16V 2 25/25 7V ≤ VIN ≤ 26V 5 50/50 mVmax Load Regulation 5 mA ≤ IOUT ≤ 500 mA 12 50/50 mVmax Output Impedance 250 mAdc and 10 mArms, fo = 120 Hz IOUT = 500 mA 24 38 100/100 mAmax IOUT = 250 mA 14 50/50 mAmax 10 Hz–100 kHz, IOUT = 100 mA 100 µV 20 mV/1000 hr Line Regulation Quiescent Current Output Noise Voltage Long Term Stability Ripple Rejection Dropout Voltage fo = 120 Hz IOUT = 500 mA 70 60/50 dBmin 0.53 0.80/1.1 Vmax IOUT = 250 mA 0.28 0.50/0.70 Vmax 0.92 0.75/0.60 Amin Continuous DC 32 26/26 Vmin VOUT ≤ 6V, ROUT = 100Ω, T ≤ 100 ms VOUT ≥ −0.6V, ROUT = 100Ω 65 60/60 Vmin −30 −15/−15 Vmin T ≤ 100 ms, ROUT = 100Ω −55 −35/−35 Vmin Current Limit Maximum Operational mΩ Input Voltage Maximum Line Transient Reverse Polarity Input Voltage DC Reverse Polarity Input Voltage Transient Electrical Characteristics VIN = 14V, Ibuf = 5 mA, Cbuf = 10 µF, unless otherwise indicated. Boldface type refers to limits over the entire operating temperature range, −40˚C ≤ TA ≤ +125˚C, all other limits are for TA = Tj = 25˚C (Note 8) . Parameter Conditions Typical Limit Units (Note 4) Vbuffer (Pin 10) Output Voltage 5 mA ≤ IO ≤ 100 mA 5.00 6V ≤ VIN ≤ 26V 4.85/4.75 Vmin 5.15/5.25 Vmax 9V ≤ VIN ≤ 16V 2 25/25 mVmax 7V ≤ VIN ≤ 26V 5 50/50 mVmax Load Regulation 5 mA ≤ Ibuf ≤ 100 mA 15 50/50 mVmax Output Impedance 50 mAdc and 10 mArms, fO = 120 Hz 200 Quiescent Current Ibuf = 100 mA 8.0 Line Regulation www.national.com 2 mΩ 15/15 mAmax Electrical Characteristics (Continued) VIN = 14V, Ibuf = 5 mA, Cbuf = 10 µF, unless otherwise indicated. Boldface type refers to limits over the entire operating temperature range, −40˚C ≤ TA ≤ +125˚C, all other limits are for TA = Tj = 25˚C (Note 8) . Parameter Conditions Typical Limit Units (Note 4) Vbuffer (Pin 10) Output Noise Voltage 10 Hz–100 kHz, IOUT = 100 mA Long Term Stability Ripple Rejection fo = 120 Hz Ibuf = 100 mA 100 µV 20 mV/1000 hr 70 60/50 dBmin 0.35 0.50/0.80 Vmax 0.23 0.15/0.15 Amin Continuous DC 32 26/26 Vmin Maximum Line Vbuf ≤ 6V, Rbuf = 100Ω, 65 60/60 Vmin Transient T ≤ 100 ms Reverse Polarity Vbuf ≥ −0.6V, Rbuf = 100Ω −30 −15/−15 Vmin T ≤ 100 ms, Rbuf = 100Ω −55 −35/−35 Vmin Dropout Voltage Current Limit Maximum Operational Input Voltage Input Voltage DC Reverse Polarity Input Voltage Transient Electrical Characteristics VIN = 14V, Istby = 1 mA, Cstby = 10 µF, unless otherwise indicated. Boldface type refers to limits over the entire operating temperature range, −40˚C ≤ TA ≤ +125˚C, all other limits are for TA = Tj = 25˚C (Note 8) . Parameter Conditions Typical Limit Units (Note 4) Vstandby (Pin 9) Output Voltage 1 mA ≤ IO ≤ 7.5 mA 5.00 6V ≤ VIN ≤ 26V 4.85/4.75 Vmin 5.15/5.25 Vmax mVmax 9V ≤ VIN ≤ 16V 2 25/25 7V ≤ VIN ≤ 26V 5 50/50 mVmax Load Regulation 0.5 mA ≤ IOUT ≤ 7.5 mA 6 50/50 mVmax Output Impedance 5 mAdc and 1 mArms, fo = 120 Hz Istby = 7.5 mA Istby = 2 mA 0.9 Quiescent Current 1.2 2.0/4.0 mAmax 0.9 1.5/4.0 mAmax Output Noise Voltage 10 Hz–100 kHz, Istby = 1 mA 100 µV 20 mV/1000 hr Line Regulation Long Term Stability Ω fo = 120 Hz Istby = 1 mA 70 60/50 dBmin 0.26 0.50/0.60 Vmax Istby = 7.5 mA 0.38 0.60/0.70 Vmax 15 12/12 mAmin 4.5V ≤ Vstby ≤ 6V, Rstby = 1000Ω 65 60/60 Vmin Vstby ≤ 6V, T ≤ 100 ms, Rstby = 1000Ω 65 60/60 Vmin Vstby ≥ −0.6V, Rstby = 1000Ω −30 −15/−15 Vmin Input Voltage DC Reverse Polarity Input T ≤ 100 ms, Rstby = 1000Ω −55 −35/−35 Ripple Rejection Dropout Voltage Current Limit Maximum Operational Input Voltage Maximum Line Transient Reverse Polarity Voltage Transient 3 Vmin www.national.com Electrical Characteristics VIN = 14V, COUT = 10 µF, Cbuf = 10 µF, Cstby = 10 µF, unless otherwise indicated. Boldface type refers to limits over the entire operating temperature range, −40˚C ≤ TA ≤ +125˚C, all other limits are for TA = Tj = 25˚C (Note 8) . Parameter Conditions Typical Limit Units (Note 4) Tracking and Isolation Tracking IOUT ≤ 500 mA, Ibuf = 5 mA, ± 30 ± 100/ ± 100 mVmax VOUT–Vstby Tracking Istby ≤ 7.5 mA IOUT = 5 mA, Ibuf ≤ 100 mA, ± 30 ± 100/ ± 100 mVmax Vbuf–Vstby Istby ≤ 7.5 mA Tracking IOUT ≤ 500 mA, Ibuf ≤ 100 mA, Istby = 1 mA ± 30 ± 100/ ± 100 mVmax VOUT–Vbuf Isolation (Note 1) ROUT = 1Ω, Ibuf ≤ 100 mA 5.00 Vbuf from VOUT Isolation (Note 1) ROUT = 1Ω, Istby ≤ 7.5 mA 5.00 Vstby from VOUT Isolation (Note 1) Rbuf = 1Ω, IOUT ≤ 500 mA 5.00 VOUT from Vbuf Isolation (Note 1) Rbuf = 1Ω, Istby ≤ 7.5 mA 5.00 Vstby from Vbuf 4.50/4.50 Vmin 5.50/5.50 Vmax 4.50/4.50 Vmin 5.50/5.50 Vmax 4.50/4.50 Vmin 5.50/5.50 Vmax 4.50/4.50 Vmin 5.50/5.50 Vmax Note 1: Isolation refers to the ability of the specified output to remain within the tested limits when the other output is shorted to ground. Electrical Characteristics VIN = 14V, IOUT = 5 mA, Ibuf = 5 mA, Istby = 5 mA, Rt = 130 kΩ, Ct = 0.33 µF, Cmon = 0.47 µF, unless otherwise indicated, Boldface type refers to limits over the entire operating temperature range, −40˚C ≤ TA ≤ +125˚C, all other limits are for TA = TJ = 25˚C (Note 8) Parameter Conditions Typical Limit Units (Note 4) Computer Monitor/Reset Functions VIN = 4V, Vrst = 0.4V VIN = 4V, Irst = 1 mA 5 2/0.50 mAmin Vreset Low 0.10 0.40/0.40 Vmax Rt voltage (Pin 2) 1.22 1.15/0.75 Vmin 1.22 1.30/2.00 Vmax Ireset Low Delay VµPmon = 5V (Tdly = 1.2 Rt Ct) ∆VOUT Low (Note 6) Power On Reset 50 45/17.0 msmin 50 55/80.0 msmax −350 Reset Threshold ∆VOUT High (Note 6) 600 Reset Threshold −225/−175 mVmin −500/−550 mVmax 225/175 mVmin 750/800 mVmax 1/5.0 µAmax VµPmon = 5V, Vrst = 12V 0.01 VµPmon = 2.4V VµPmon = 0.4V 7.5 25/25 µAmax 0.01 10/15 µAmax µPmon Input 1.22 0.80/0.80 Vmin Threshold Voltage 1.22 2.00/2.00 Vmax Reset Output Leakage µPmon Input Current (Pin 4) µP Monitor Reset VµPmon = 0V (Twindow = 0.82 RtCmon) VµPmon = 0V 1.0 0.7/0.4 msmin Oscillator Pulse Width (RESETpw = 2000 Cmon) 1.0 1.3/2.10 msmax Minimum µP Monitor (Note 7) µP Monitor Reset Oscillator Period 50 45/30 msmin 50 55/70 msmax 2 µs Input Pulse Width Reset Fall Time www.national.com Rrst = 10k, Vrst = 5V, Crst ≤ 10 pF 4 0.20 1.00/1.00 µsmax Electrical Characteristics (Continued) VIN = 14V, IOUT = 5 mA, Ibuf = 5 mA, Istby = 5 mA, Rt = 130 kΩ, Ct = 0.33 µF, Cmon = 0.47 µF, unless otherwise indicated, Boldface type refers to limits over the entire operating temperature range, −40˚C ≤ TA ≤ +125˚C, all other limits are for TA = TJ = 25˚C (Note 8) Parameter Conditions Typical Limit Units (Note 4) Computer Monitor/Reset Functions Reset Rise Time On/Off Switch Input Current (Pin 8) Rrst = 10k, Vrst = 5V, Crst ≤ 10 pF VON = 2.4V VON = 0.4V 0.60 1.00/1.50 µsmax 7.5 25/25 µAmax µAmax 0.01 10/10 On/Off Switch Input 1.22 0.80/0.80 Vmin Threshold Voltage 1.22 2.00/2.00 Vmax Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its specified operating ratings. Note 3: Thermal resistance without a heatsink for junction-to-case temperature is 3˚C/W. Thermal resistance case-to-ambient is 40˚C/W. Note 4: Tested Limits are guaranteed and 100% production tested. Note 5: Human body model, 100 pF capacitor discharged through a 1500Ω resistor. Note 6: Internal comparators detect when the main regulator output (VOUT) changes from the measured output voltage (with VIN = 14V) by the specified amount, ∆VOUT High or ∆VOUT Low, and set the Reset Error Flag low. The Reset Error Flag is held low until VOUT returns to regulation. The Reset Error Flag is then allowed to go high again after a delay set by Rtand Ct. (see application section). Note 7: This parameter is a measure of how short a pulse can be detected at the µP Monitor Input. This parameter is primarily influenced by the value of Cmon. (See Application Hints Section.) Note 8: To ensure constant junction temperature, low duty cycle pulse testing is used. Block Diagram DS011252-2 5 www.national.com Pin Description Pin No. Pin Name Comments 1 VIN Positive supply input voltage 2 Rt Sets internal timing currents 3 Ct Sets power-up reset delay timing 4 µPmon Microcomputer monitor input 5 Cmon Sets µC monitor timing 6 Ground Regulator ground 7 Reset Reset error flag output 8 ON/OFF Enables/disables high current regulators 9 Vstandby Standby regulator output (7.5 mA) 10 Vbuffer Buffer regulator output (100 mA) 11 VOUT Main regulator output (500 mA) External Components Component Typical Value Component Range CIN 1 µF 0.47 µF–10 µF Rt 130k 24k–510k Ct 0.33 µF 0.033 µF–3.3 µF Ctc 0.01 µF 0.001 µF–0.1 µF Rtc 10k 1k–100k 0.47 µF 0.047 µF–4.7 µF Sets time window for computer monitor. Also determines period and pulse width of computer malfunction reset. (See applications section.) Rrst 10k 5k–100k Load for open collector reset output. Determined by computer reset input requirements. Cstby 10 µF 10 µF–no bound A 10 µF is required for stability but larger values can be used to maintain regulation during transient conditions. Cbuf 10 µF 10 µF–no bound A 10 µF is required for stability but larger values can be used to maintain regulation during transient conditions. COUT 10 µF 10 µF–no bound A 10 µF is required for stability but larger values can be used to maintain regulation during transient conditions. Cmon www.national.com Comments Required if device is located far from power supply filter. Sets internal timing currents. Sets power-up reset delay. Establishes time constant of AC coupled computer monitor. Establishes time constant of AC coupled computer monitor. (See applications section.) 6 Typical Circuit Waveforms DS011252-3 Connection Diagram DS011252-4 Order Number LM2984T See NS Package Number TA11B 7 www.national.com Typical Performance Characteristics Dropout Voltage (VOUT) Dropout Voltage (Vbuf) DS011252-16 Dropout Voltage (VOUT) Dropout Voltage (Vbuf) Peak Output Current (VOUT) Dropout Voltage (Vstby) DS011252-20 Peak Output Current (Vbuf) DS011252-22 Quiescent Current (VOUT) DS011252-18 DS011252-17 DS011252-19 DS011252-21 Peak Output Current (Vstby) DS011252-24 DS011252-23 Quiescent Current (Vbuf) DS011252-25 www.national.com Dropout Voltage (Vstby) Quiescent Current (Vstby) DS011252-26 8 DS011252-27 Typical Performance Characteristics Quiescent Current (VOUT) (Continued) Quiescent Current (Vbuf) DS011252-28 Quiescent Current (VOUT) Quiescent Current (Vstby) DS011252-29 Quiescent Current (Vbuf) DS011252-31 Output Voltage (VOUT) Quiescent Current (Vstby) DS011252-32 Output Voltage (Vbuf) DS011252-34 Low Voltage Behavior (VOUT) DS011252-30 Output Voltage (Vstby) DS011252-35 Low Voltage Behavior (Vbuf) DS011252-37 DS011252-38 9 DS011252-33 DS011252-36 Low Voltage Behavior (Vstby) DS011252-39 www.national.com Typical Performance Characteristics Line Transient Response (VOUT) (Continued) Line Transient Response (Vbuf) Line Transient Response (Vstby) DS011252-40 Load Transient Response (VOUT) DS011252-41 Load Transient Response (Vbuf) Load Transient Response (Vstby) DS011252-43 Output Impedance (VOUT) DS011252-44 Output Impedance (Vbuf) DS011252-46 www.national.com DS011252-42 Output Impedance (Vstby) DS011252-47 10 DS011252-45 DS011252-48 Typical Performance Characteristics Ripple Rejection (VOUT) (Continued) Ripple Rejection (Vbuf) DS011252-49 Ripple Rejection (Vstby) DS011252-50 Output Voltage DS011252-51 Device Dissipation vs Ambient Temperature DS011252-8 DS011252-9 Output Capacitor ESR (Standby Output, Pin 9) Output Capacitor ESR (Buffer Output, Pin 10) DS011252-10 Output Capacitor ESR (Main Output, Pin 11) DS011252-11 DS011252-12 mum capacitor value to use in production. Worst case is usually determined at the minimum ambient temperature and the maximum load expected. Output capacitors can be increased in size to any desired value above the minimum. One possible purpose of this would be to maintain the output voltages during brief conditions of negative input transients that might be characteristic of a particular system. Application Hints OUTPUT CAPACITORS The LM2984 output capacitors are required for stability. Without them, the regulator outputs will oscillate, sometimes by many volts. Though the 10 µF shown are the minimum recommended values, actual size and type may vary depending upon the application load and temperature range. Capacitor effective series resistance (ESR) also affects the IC stability. Since ESR varies from one brand to the next, some bench work may be required to determine the mini- Capacitors must also be rated at all ambient temperatures expected in the system. Many aluminum type electrolytics will freeze at temperatures less than −30˚C, reducing their 11 www.national.com Application Hints switching from the standby mode to the active mode and vice versa. This pin can be tied to the input voltage through a 10 kΩ resistor if the regulator is to be powered continuously. (Continued) effective capacitance to zero. To maintain regulator stability down to −40˚C, capacitors rated at that temperature (such as tantalums) must be used. Each output must be terminated by a capacitor, even if it is not used. POWER DOWN OVERRIDE Another possible approach is to use a diode in series with the ON/OFF signal and another in series with the main output in order to maintain power for some period of time after the ON/OFF signal has been removed (see Figure 1). When the ON/OFF switch is initially pulled high through diode D1, the main output will turn on and supply power through diode D2 to the ON/OFF switch effectively latching the main output. An open collector transistor Q1 is connected to the ON/ OFF pin along with the two diodes and forces the regulators off after a period of time determined by the µP. In this way, the µP can override a power down command and store data, do housekeeping, etc. before reverting back to the standby mode. STANDBY OUTPUT The standby output is intended for use in systems requiring standby memory circuits. While the high current regulator outputs are controlled with the ON/OFF pin described later, the standby output remains on under all conditions as long as sufficient input voltage is supplied to the IC. Thus, memory and other circuits powered by this output remain unaffected by positive line transients, thermal shutdown, etc. The standby regulator circuit is designed so that the quiescent current to the IC is very low ( < 1.5 mA) when the other regulator outputs are off. The capacitor on the output of this regulator can be increased without bound. This will help maintain the output voltage during negative input transients and will also help to reduce the noise on all three outputs. Because the other two track the standby output: therefore any noise reduction here will also reduce the other two noise voltages. BUFFER OUTPUT The buffer output is designed to drive peripheral sensor circuitry in a µP system. It will track the standby and main regulator within a few millivolts in normal operation. Therefore, a peripheral sensor can be powered off this supply and have the same operating voltage as the µP system. This is important if a ratiometric sensor system is being used. The buffer output can be short circuited while the other two outputs are in normal operation. This protects the µP system from disruption of power when a sensor wire, etc. is temporarily shorted to ground, i.e. only the sensor signal would be interrupted, while the µP and memory circuits would remain operational. The buffer output is similar to the main output in that it is controlled by the ON/OFF switch in order to save power in the standby mode. It is also fault protected against overvoltage and thermal overload. If the input voltage rises above approximately 30V (e.g. load dump), this output will automatically shut down. This protects the internal circuitry and enables the IC to survive higher voltage transients than would otherwise be expected. Thermal shutdown is necessary since this output is one of the dominant sources of power dissipation in the IC. DS011252-13 FIGURE 1. Power Down Override RESET OUTPUT This output is an open collector NPN transistor which is forced low whenever an error condition is present at the main output or when a µP error is sensed (see µP Monitor section). If the main output voltage drops by 350 mV or rises out of regulation by 600 mV typically, the RESET output is forced low and held low for a period of time set by two external components, Rt and Ct. There is a slight amount of hysteresis in these two threshold voltages so that the RESET output has a fast rise and fall time compatible with the requirements of most µP RESET inputs. DELAYED RESET Resistor Rt and capacitor Ct set the period of time that the RESET output is held low after a main output error condition has been sensed. The delay is given by the formula: Tdly = 1.2 RtCt (seconds) The delayed RESET will be initiated any time the main output is out of regulation, i.e. during power-up, short circuit, overvoltage, low line, thermal shutdown or power-down. The µP is therefore RESET whenever the output voltage is out of regulation. (It is important to note that a RESET is only initiated when the main output is in error. The buffer and standby outputs are not directly monitored for error conditions.) MAIN OUTPUT The main output is designed to power relatively large loads, i.e. approximately 500 mA. It is therefore also protected against overvoltage and thermal overload. This output will track the other two within a few millivolts in normal operation. It can therefore be used as a reference voltage for any signal derived from circuitry powered off the standby or buffer outputs. This is important in a ratiometric sensor system or any system requiring accurate matching of power supply voltages. µP MONITOR RESET There are two distinct and independent error monitoring systems in the LM2984. The one described above monitors the main regulator output and initiates a delayed RESET whenever this output is in error. The other error monitoring system is the µP watchdog. These two systems are OR’d together internally and both force the RESET output low when either type of error occurs. ON/OFF SWITCH The ON/OFF switch controls the main output and the buffer output. The threshold voltage is compatible with most logic families and has about 20 mV of hysteresis to insure “clean” www.national.com 12 Application Hints monitor input. If the incoming signal continues in a high state or in a low state for too long a period of time, a RESET low will be generated. (Continued) This watchdog circuitry continuously monitors a pin on the µP that generates a positive going pulse during normal operation. The period of this pulse is typically on the order of milliseconds and the pulse width is typically on the order of 10’s of microseconds. If this pulse ever disappears, the watchdog circuitry will time out and a RESET low will be sent to the µP. The time out period is determined by two external components, Rt and Cmon, according to the formula: Twindow = 0.82 RtCmon (seconds) The width of the RESET pulse is set by Cmon and an internal resistor according to the following: RESETpw = 2000 Cmon (seconds) DS011252-14 FIGURE 2. Monitoring Square Wave µP Signals The threshold voltage and input characteristics of this pin are compatible with nearly all logic families. There is a limit on the width of a pulse that can be reliably detected by the watchdog circuit. This is due to the output resistance of the transistor which discharges Cmon when a high state is detected at the input. The minimum detectable pulse width can be determined by the following formula: PWmin = 20 Cmon (seconds) A square wave signal can also be monitored for errors by filtering the Cmon input such that only the positive edges of the signal are detected. Figure 2 is a schematic diagram of a typical circuit used to differentiate the input signal. Resistor Rtc and capacitor Ctc pass only the rising edge of the square wave and create a short positive pulse suitable for the µP 13 www.national.com DS011252-15 Equivalent Schematic Diagram www.national.com 14 15 LM2984 Microprocessor Power Supply System Physical Dimensions inches (millimeters) unless otherwise noted Molded TO-220 Package (TA) Order Number LM2984T NS Package Number TA11B 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 OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support 1. 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