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NCV8518B Low Dropout Linear Regulator with Watchdog, Wake Up, RESET, and ENABLE
The NCV8518B device is a precision micropower voltage regulator. It has a fixed output voltage of 5.0 V and regulates within 2%. It is suitable for use in all automotive environments and contains all the required functions to control a microprocessor. This device has low dropout voltage and low quiescent current. It includes a watchdog timer, adjustable reset, wake up and enable function. Also encompassed in this device are safety features such as thermal shutdown and short circuit protection. It is capable of handling up to 45 V transients.
Features http://onsemi.com MARKING DIAGRAMS
8 8 1 SOIC-8 EXPOSED PAD CASE 751AC 1 16 SOIC-16 LEAD WIDE BODY EXPOSED PAD CASE 751AG 1 1 A WL YY, Y WW G or G = Assembly Location = Wafer Lot = Year = Work Week = Pb-Free Package NCV8518B AWLYYWWG 8518B AYWW G
* * * *
* * * * * * * *
Output Voltage of 5.0 V 2% Output Voltage Tolerance Output Current up to 250 mA Micropower Compatible Control Functions: - ENABLE - Watchdog - RESET - Wake Up NCV Prefix for Automotive and Other Applications Requiring Site and Change Control Low Dropout Voltage Low Quiescent Current of 100 mA Protection Features: - Thermal Shutdown - Short Circuit Low Sleep Mode Current less than 1.0 mA AEC Qualified PPAP Capable These are Pb-Free Devices
16
ORDERING INFORMATION
Device Package Shipping 2500 / Tape & Reel
NCV8518BPDR2G SOIC-8*
NCV8518BPWR2G SOIC-16* 1000 / Tape & Reel For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. *These packages are inherently Pb-Free.
Applications
* Tire Pressure Monitor * Battery Powered Consumer Electronics
(c) Semiconductor Components Industries, LLC, 2010
June, 2010 - Rev. 1
1
Publication Order Number: NCV8518B/D
NCV8518B
PIN CONNECTIONS
1 SOIC-8 EP 8 SOIC-16 EP RESET WDI ENABLE VIN NC NC GND NC Delay NC NC VOUT 1 16 Wake Up RESET NC WDI NC ENABLE NC VIN
Wake Up GND Delay VOUT
PIN FUNCTION DESCRIPTION
Pin SOIC-8 EP 4 5 7 2 6 SOIC-16 EP 8 9 13 3 11 Symbol VOUT VIN WDI GND ENABLE Regulated output voltage. Input supply voltage. CMOS compatible Watchdog input. The watchdog function monitors the falling edge of the incoming signal. Ground connection. ENABLE control for the IC. Positive logic. If ENABLE control will not be used, connect this pin to VIN via a 20k current limiting resistor. Internal ESD protection structures will clamp the maximum ENABLE voltage to approximately 21 V. CMOS compatible output RESET goes low whenever VOUT drops by more than 7.0% from nominal, or during the absence of a correct watchdog signal. Buffered reference voltage used to create timing current for RESET and Watchdog threshold frequency from RDelay. No Connection. Continuously generated signal that interrupts the microprocessor from sleep mode. Connect to Ground potential or leave unconnected. Description
8 3 - 1 EPAD
15 5 1, 2, 4, 6, 7, 10, 12, 14 16 EPAD
RESET Delay NC Wake Up EPAD
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NCV8518B
VIN
VOUT
Ilimit OSCH
ENABLE
Enable
TSD FB Rail OSCL +-
Reference VBG
+UVLO Watchdog + Wakeup Logic Iref OSCH OSCL
WDI
Buffer
Reset Driver
RESET
Delay
+ -
Timing Circuit
Wakeup Driver
Wake Up
Figure 1. Block Diagram
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NCV8518B
MAXIMUM RATINGS
Rating Input Voltage ENABLE Voltage (ENABLE may be connected to VIN through an external 20k resistor without damage) Output Voltage RESET Voltage RESET Current (RESET may be incidentally shorted either to VOUT or to GND without damage) ESD Susceptibility (Human Body Model) Logic Inputs/Outputs (Reset, WDI, Wake Up, Delay) Operating Junction Temperature Storage Temperature Range Moisture Sensitivity Level SOIC-16 EP (Case 751R) SOIC-8 EP (Case 751AC) Lead Temperature Soldering: Reflow Leaded Part 60-150 sec above 183C, 30 sec max at peak Lead-Free Part 60-150 sec above 217C, 40 sec max at peak Symbol VIN VENABLE VOUT VRESET IRESET - - TJ TS MSL Value -0.3 to 45 -0.3 to 16 -0.3 to +7.0 0 V to VOUT Internally Limited 2.0 -0.3 to +7.0 -40 to150 -55 to +150 1 3 240 peak 265 peak C C Unit V V V V mA kV V C C
- -
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
THERMAL CHARACTERISTICS
Parameter SO-8 Exposed Pad Package 100 sq. mm spreader board (Note 1) Junction to case top (YJT) Junction to lead1 (YJL1) Junction to board (YJB) (Note 3) Junction to ambient (qJA) SO-16 Exposed Pad Package 100 sq. mm spreader board (Note 1) Junction to case top (YJT) Junction to lead1 (YJL1) Junction to board (YJB) (Note 3) Junction to ambient (qJA) 20 41 12 113 1 sq. inch spreader board (Note 2) 20 26 12 70 C/W C/W C/W C/W 14 36 15 126 1 sq. inch spreader board (Note 2) 14 26 14 80 C/W C/W C/W C/W Board/Mounting Conditions Typical Value Unit
Specific notes on thermal characterization conditions:
All boards are 0.062" thick FR4, 3" square, with varying amounts of copper heat spreader, in still air (free convection) conditions. Numerical values are derived from an axisymmetric finite-element model where active die area, total die area, flag area, pad area, and board area are equated to the actual corresponding areas. 1. 1 oz copper, 100 mm2 (0.155 in2) spreader area (includes exposed pad). 2. 1 oz copper, 645 mm2 (1 in2) spreader area (includes exposed pad). 3. "board" is defined as center of exposed pad soldered to board; this is the recommended number to be used for thermal calculations, as it best represents the primary heat flow path and is least sensitive to board and ambient properties.
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NCV8518B
ELECTRICAL CHARACTERISTICS (-40C TJ 150C; 6.0 V VIN 28 V, 100 mA IOUT 150 mA, C2 = 1.0 mF, RDelay = 60 k;
unless otherwise specified.) Characteristic Output Output Voltage Dropout Voltage (VIN - VOUT, IOUT = 150 mA) (Note 4) Load Regulation (VIN = 13.5 V, 100 mA IOUT 150 mA) Line Regulation (6.0 V VIN 28 V, IOUT = 5.0 mA) Current Limit Thermal Shutdown (Guaranteed by Design) Quiescent Current (VIN = 13.5 V, IOUT = 100 mA, 150 mA, ENABLE = 2.0 V) (ENABLE = 0 V, TA = +125C) RESET Threshold Voltage Output Low (RLOAD = 10 k to VOUT, VOUT = 1.0 V) Output High (RLOAD = 10 k to GND) Power On Reset Delay Time (VIN = 13.5 V, RDelay = 60 k, IOUT = 5.0 mA) (VIN = 13.5 V, RDelay = 120 k, IOUT = 5.0 mA) VIN = 13.5 V, RDelay = 500 k, IOUT = 5.0 mA) Reset Reaction Time Input and ENABLE Transient Rejection (Note 6) Watchdog Input Threshold Hysteresis (Guaranteed by design) Input Current (WDI = 6.0 V) Wake Up Rising Edge to WDI Falling Edge Delay Wake Up WDI ENABLE (Note 5) Input Threshold Logic Low Logic High Input Current (ENABLE = 2.0 V) Vth(EN) V - 2.0 - - - 3.0 0.8 - 10 mA WDIhigh WDIhys - - 30 25 - 5.0 50 100 0.1 - 70 - 2.0 - %VOUT mV mA ms - - - tD 4.50 - VOUT - 0.4 2.0 - - - 1.0 4.65 0.2 VOUT - 0.2 3.0 6.0 25 20 - 4.75 0.4 - 4.0 - - - - ms V/ms V V V ms VOUT VDO Regload Regline Ilim TJmax IQ 4.9 -2% - - - 255 150 - - 5.00 425 5.0 5.0 400 180 100 - 5.10 +2% 750 30 20 - 210 150 1.0 V mV mV mV mA C mA Symbol Min Typ Max Unit
Trr dV/dt
-
4. Measured when the output voltage has dropped 2% from the nominal value. 5. If ENABLE is connected to VIN, a 20 kW resistor must be placed in series. 6. Slew rates in excess of this limit may cause RESET to change state.
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NCV8518B
ELECTRICAL CHARACTERISTICS (continued) (-40C TJ 150C; 6.0 V VIN 28 V, 100 mA IOUT 150 mA, C2 = 1.0 mF, RDelay = 60 k; unless otherwise specified.)
Characteristic Wake Up Output (VIN = 14 V, IOUT = 5.0 mA) Wake Up Period (RDELAY = 60 k) (RDELAY = 120 k) (RDELAY = 500 k) Wake Up Duty Cycle Nominal RESET HIGH to Wake Up Rising Delay Time (RDELAY = 60 k) 50% RESET Rising Edge to 50% Wake Up Edge (RDELAY = 120 k) (RDELAY = 500 k) Wake Up Response to Watchdog Input 50% WDI Falling Edge to 50% Wake Up Falling Edge Wake Up Response to RESET 50% RESET Falling Edge to 50% Wake Up Falling Edge (VOUT = 5.0 V 4.5 V) Output Low (RLOAD = 10 k) Output High (RLOAD = 10 k) Delay Output Voltage (RDELAY = 60 k, 120 k, 500 k) - - 0.48 - V - 18 - - - - 9.0 - - - - 12.5 25 104 0.1 16 - - 5.0 ms 45 25 50 208 50 32 - - 55 % ms ms Symbol Min Typ Max Unit
-
-
0.1
5.0
ms
- -
- VOUT - 0.5
0.2 VOUT - 0.25
0.4 -
V V
DEFINITION OF TERMS Dropout Voltage: The input-to-output voltage differential at which the circuit ceases to regulate against further reduction in input voltage. Measured when the output voltage has dropped 100 mV from the nominal value obtained at 14 V input, dropout voltage is dependent upon load current and junction temperature. Input Voltage: The DC voltage applied to the input terminals with respect to ground. Line Regulation: The change in output voltage for a change in the input voltage. The measurement is made under conditions of low dissipation or by using pulse techniques such that the average chip temperature is not significantly affected. Load Regulation: The change in output voltage for a change in load current at constant chip temperature. Quiescent Current: The part of the positive input current that does not contribute to the positive load current. The regulator ground lead current with no load. Current Limit: Peak current that can be delivered to the output.
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NCV8518B
TIMING DIAGRAMS
VIN, ENABLE RESET
Wake Up Duty Cycle = 50%
Wake Up RESET High to Wake Up Delay Time WDI Min WDI falling edge delay after Wake Up rising edge Microprocessor Sleep Mode Normal Operation with Varying Watchdog Signal Wake Up Duty Cycle will be 50% when the WDI pulse occurs at the low state of the Wake Up Signal.
VOUT POR Power Up
Figure 2. Power Up, Sleep Mode and Normal Operation
VIN, ENABLE RESET Wake Up
RESET Delay Time
WDI
RESET High to Wake Up Delay Time
VOUT POR Wake Up Period
Figure 3. Error Condition: Watchdog Remains Low and a RESET is Issued
RESET Wake Up WDI VIN, ENABLE RESET Threshold VOUT POR VOUT Decreasing Power Down Wake Up Response to Reset Wake Up Period
POR
Wake Up Response to WDI
Figure 4. Power Down, Restart Sequence, and Wake Up Response to WDI http://onsemi.com
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NCV8518B
TYPICAL PERFORMANCE CHARACTERISTICS
5.1 5.01
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
5.0
5 mA Load
25C 5.00
4.9 -50
0
50 100 TJ, TEMPERATURE (C)
150
4.99
5
10
15 20 INPUT VOLTAGE (V)
25
30
Figure 5. Output Voltage vs. Temperature
Figure 6. Output Voltage vs. Input Voltage
3.3 3.2
6.4
6.2 POR DELAY (ms) 3.1 3.0 2.9 2.8 2.7 -50 5.6 -50 60 kW Rdelay POR DELAY (ms)
6.0
120 kW Rdelay
5.8
0
50 100 TJ, TEMPERATURE (C)
150
0
50 100 TJ, TEMPERATURE (C)
150
Figure 7. POR Delay vs. Temperature, 60 kW Rdelay
Figure 8. POR Delay vs. Temperature, 120 kW Rdelay
10000 1000 100 100 mF 10 1 0.1 mF UNSTABLE 0.1 0 25 50 75 OUTPUT CURRENT (mA) 100 STABLE REGION, ALL CAP VALUES UNSTABLE REGION WAKEUP PERIOD (ms) 0.1 - 10 mF ESR (W)
27
26 60 kW Rdelay
25
24
23 -50
0
50 100 TJ, TEMPERATURE (C)
150
Figure 9. Stability Region of Capacitive ESR vs. Output Current
Figure 10. Wakeup Period vs. Temperature
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NCV8518B
TYPICAL PERFORMANCE CHARACTERISTICS
250 200 POR DELAY (ms) 0 100 200 300 400 500 150 100 50 0 30 25 20 15 10 5 0
WAKEUP PERIOD (ms)
0
100
200
300
400
500
RDelay (kW)
RDelay (kW)
Figure 11. Wakeup Period vs. RDelay
Figure 12. POR Delay vs. RDelay
6 5 OUTPUT VOLTAGE (V) 4 3 2 1 0
60 4.7 mF, 0.32 ESR VOUT TRANSIENT (mV) 50 40 22 mF, 0.20 ESR 30 20 10 4 2 3 INPUT VOLTAGE (V) 5 0 100 mF, 0.12 ESR
0
1
6
0
50
100 150 200 SWITCHING CURRENT (mA)
250
Figure 13. Output Voltage vs. Input Voltage, 5 mA Load
700 DROPOUT VOLTAGE (mV) 600 500 400 300 200 100 0 0 50 100 LOAD CURRENT (mA) 150 25C 104 QUIESCENT CURRENT (mA)
Figure 14. Load Transient Response
125C
102
-40C
100
25C
-40C
98
125C
96
0
50 100 LOAD CURRENT (mA)
150
Figure 15. Dropout Voltage vs. Output Current
Figure 16. Quiescent Current vs. Output Current
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NCV8518B
OPERATING DESCRIPTION
General RESET
The NCV8518B is a precision micropower voltage regulator featuring low quiescent current (100 mA typical at 250 mA load) and low dropout voltage (450 mV typical at 150 mA). Integrated microprocessor control functions include Watchdog, Wakeup and RESET. An Enable input is provided for logic level control of the regulator state. The combination of low quiescent current and comprehensive microprocessor interface functions make the NCV8518B ideal for use in both battery operated and automotive applications. The NCV8518B is internally protected against short circuit and thermal runaway conditions. No external components are required to engage these protective mechanisms. The device continues to operate through 45 volt input transients, an important consideration in automotive environments.
Wakeup and Watchdog
To reduce battery drain, a microprocessor or microcontroller can transition to a low current consumption ("sleep") mode when code execution is suspended or complete. The NCV8518B Wakeup signal is generated and output periodically to interrupt sleep mode. The nominal Wakeup output is a 5 volt square wave (generated from VOUT) with a duty cycle of 50%, at a frequency determined by external timing resistor RDELAY. In response to the rising edge of the Wakeup signal, the microprocessor will subsequently output a Watchdog pulse and check its inputs to decide if it should resume normal operation or remain in sleep mode. The NCV8518B responds to the falling edge of the Watchdog signal, which it expects at least once during each Wakeup period. When the correct Watchdog signal is received, the Wakeup output is forced low. Other Watchdog pulses received within the same cycle are ignored. The Watchdog circuitry continuously monitors the input Watchdog signal (WDI) from the microprocessor. The absence of a falling edge on the Watchdog input during one Wakeup cycle will cause a Reset pulse to be output at the end of the Wakeup cycle (see Figure 4).
As output voltage falls, the RESET output will maintain its current state down to VOUT = 1 V. A Reset signal (active low) is asserted for any of four conditions: 1. During power up, RESET is held low until the output voltage is in regulation. 2. During operation, if the output voltage falls below the Reset threshold, RESET switches low, and will remain low until both the output voltage has recovered and the Reset delay timer cycle has completed following that recovery. 3. RESET will switch low if the regulator does not receive a Watchdog input signal within a Wakeup period. 4. Regardless of output voltage, RESET will switch low if the regulator input voltage VIN, falls below a level required to sustain the internal control circuits. The specific voltage is temperature dependent, and is approximately 4.75 V at 20C. The Wakeup output is pulled low during a RESET regardless of the cause of the RESET. After the RESET returns high, the Wakeup cycle begins again (see Figure 4). The RESET Delay Time, Wakeup signal frequency and RESET high to Wakeup delay time are all set by one external resistor, RDelay, according to the following equations:
Wakeup Period (seconds) = (4.17 RESET Delay Time (seconds) = (5.21 10-7) * RDELAY (W) 10-8) * RDELAY (W)
RESET High to Wakeup Delay Time (seconds) = (2.08 10-7) * RDELAY (W)
The voltage present at the Delay pin is a buffered bandgap voltage (~1.25 V) and can be used as a reference for an external tracking regulator.
Enable
This is a standard TTL and CMOS logic compatible input that can be used to turn the regulator on or off. Logic high enables the regulator; logic low disables it (also called shutdown). In the disabled/shutdown state, the pass transistor is off and total quiescent current is less than 1 mA.
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NCV8518B
VBAT VIN VOUT VDD I/O OK Fault RESET I/O
C1* 0.1 mF
C2 1.0 mF
NCV8518B Delay RESET WAKE UP RDelay 120 k GND ENABLE
OFF
ON
*C1 required if regulator is located far from power supply filter. If extremely fast input voltage transients are expected then appropriate input filter must be used. The filter can be composed of several capacitors in parallel.
Figure 17. Application Circuit
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Microprocessor
WDI
NCV8518B
PACKAGE DIMENSIONS
SOIC-8 EP D SUFFIX CASE 751AC-01 ISSUE B
2X
D A
8 5
0.10 C A-B D DETAIL A
EXPOSED PAD 5
F
8
2X
0.10 C D
PIN ONE LOCATION
0.10 C
8X
A2
A
GAUGE PLANE
0.10 C
SEATING PLANE
b1 L (L1) DETAIL A q
C
SIDE VIEW
A1
0.25
c1
SECTION A-A
SOLDERING FOOTPRINT*
2.72 0.107 1.52 0.060
7.0 0.275
2.03 0.08
4.0 0.155
0.6 0.024
1.270 0.050
SCALE 6:1
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
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EE CC EE CC EE EE
EEE EEE
1
E1
E
2X 4
G h
4 1
NOTES: 1. DIMENSIONS AND TOLERANCING PER ASME Y14.5M, 1994. 2. DIMENSIONS IN MILLIMETERS (ANGLES IN DEGREES). 3. DIMENSION b DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08 MM TOTAL IN EXCESS OF THE "b" DIMENSION AT MAXIMUM MATERIAL CONDITION. 4. DATUMS A AND B TO BE DETERMINED AT DATUM PLANE H. DIM A A1 A2 b b1 c c1 D E E1 e L L1 F G h q MILLIMETERS MIN MAX 1.35 1.75 0.00 0.10 1.35 1.65 0.31 0.51 0.28 0.48 0.17 0.25 0.17 0.23 4.90 BSC 6.00 BSC 3.90 BSC 1.27 BSC 0.40 1.27 1.04 REF 2.24 3.20 1.55 2.51 0.25 0.50 0_ 8_
0.20 C
8X b 0.25 C A-B D
e
BOTTOM VIEW
B TOP VIEW
A
A
END VIEW H c
(b)
Exposed Pad
mm inches
NCV8518B
PACKAGE DIMENSIONS
SOIC-16 LEAD WIDE BODY, EXPOSED PAD PDW SUFFIX CASE 751AG-01 ISSUE A
A -U- M
16 1 8 9 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. 6. 751R-01 OBSOLETE, NEW STANDARD 751R-02. MILLIMETERS MIN MAX 10.15 10.45 7.40 7.60 2.35 2.65 0.35 0.49 0.50 0.90 1.27 BSC 3.45 3.66 0.25 0.32 0.00 0.10 4.72 4.93 0_ 7_ 10.05 10.55 0.25 0.75 INCHES MIN MAX 0.400 0.411 0.292 0.299 0.093 0.104 0.014 0.019 0.020 0.035 0.050 BSC 0.136 0.144 0.010 0.012 0.000 0.004 0.186 0.194 0_ 7_ 0.395 0.415 0.010 0.029
P 0.25 (0.010)
M
W
M
B -W-
R x 45_
PIN 1 I.D.
G TOP SIDE
14 PL
DETAIL E
C -T- 0.10 (0.004) T D 16 PL 0.25 (0.010) H
1 8 M
F
K TU
S
SEATING PLANE
W
S
J DETAIL E
SOLDERING FOOTPRINT*
L 0.350 0.175 0.050
EXPOSED PAD
DIM A B C D F G H J K L M P R
16
9
Exposed Pad
BACK SIDE
C L 0.200 0.074
0.188 C L 0.376
0.024
0.150
DIMENSIONS: INCHES
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
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NCV8518B/D

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