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 Datasheet
AS1361/AS1362
150mA/300mA, Ultra-Low-Noise, High-PSRR Low Dropout Regulators, with POK
1 General Description
The AS1361/AS1362 are ultra-low-noise, low-dropout linear regulators specifically designed to deliver up to 150/300mA continuous output current, and can achieve a low 140mV dropout for 300mA load current. The LDOs are designed and optimized to work with low-cost, smallcapacitance ceramic capacitors. The devices are available as the standard products listed in Table 1. Table 1. Standard Products Model AS1361 AS1362 Load Current 150mA 300mA Output Voltage Preset - 1.5 to 4.5V Preset - 1.5 to 4.5V
2 Key Features
! ! ! ! ! ! ! ! ! ! ! !
Preset Output Voltages: 1.5 to 4.5V (in 50mV steps) Output Noise: 9VRMS @ 100Hz to 100kHz Power-Supply Rejection Ratio: 92dB @ 1kHz Low Dropout: 140mV @ 300mA Load Power-OK Output Stable with 1F Ceramic Capacitor for any Load Guaranteed 150/300mA Output 1.25V Internal Reference Extremely-Low Quiescent Current: 40A Excellent Load/Line Transient Overcurrent and Thermal Protection TSOT23 6-pin Package
An integrated P-channel MOSFET pass transistor allows the devices to maintain extremely low quiescent current (40A). The AS1361/AS1362 uses an advanced architecture to achieve ultra-low output voltage noise of 9VRMS and a power-supply rejection-ratio of better than 80dB (up to 10kHz). An active-Low, open-drain power-ok output indicates if the output voltage is within regulation. The AS1361/AS1362 requires only 1F output capacitor for stability at any load. When the LDO is disabled, current consumption drops below 500nA. The devices are available in a TSOT23 6-pin package.
3 Applications
The devices are ideal for mobile phones, wireless phones, PDAs, handheld computers, mobile phone base stations, Bluetooth portable radios and accessories, wireless LANs, digital cameras, personal audio devices, and any other portable, battery-powered application.
Figure 1. Typical Application Circuit
Input 2 to 5.5V CIN 1F
1 IN
6 OUT
Output 1.5 to 4.5V IN 1 100k 6 OUT
On Off
3 SHDNN
AS1361/ AS1362
4 POK GND 2
AS1361/ AS1362
5 BYPASS
2 GND
5 BYPASS
CBYPASS 10nF COUT 1F
SHDNN 3
4 POK
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AS1361/AS1362
Datasheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
IN 1
6 OUT
GND 2
AS1361/ AS1362
5 BYPASS
SHDNN 3
4 POK
TSOT23 6-pin
Pin Descriptions
Table 2. Pin Descriptions Pin Number 1 2 3 Pin Name IN GND SHDNN Unregulated Input Supply. Ground Shutdown. Pull this pin low to disable the LDO. Power-OK Output. Active-Low, open-drain output indicates if the output voltage is within regulation. 0 = VOUT <94% VOUTNOM 1 = VOUT >94% VOUTNOM Noise Bypass for Low-Noise Operation. Connect a 10nF capacitor from this pin to OUT. Note: This pin is shorted to GND in shutdown mode. Regulated Output Voltage. Bypass this pin with a capacitor to GND. See Capacitor Selection and Regulator Stability on page 12 for more details. Description
4
POK
5
BYPASS
6
OUT
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AS1361/AS1362
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 3 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 Electrical Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 3. Absolute Maximum Ratings Parameter IN to GND OUT, SHDNN, POK to GND BYPASS to GND Output Short-Circuit Duration Thermal Resistance JA Operating Temperature Range Junction Temperature Storage Temperature Range -65 -40 Min -0.3 -0.3 -0.3 Max +7 IN + 0.3 OUT + 0.3 Infinite 201.7 +85 +150 +150 C/W C C C The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC J-STD-020D "Moisture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices". The lead finish for Pb-free leaded packages is matte tin (100% Sn). on PCB Units V V V Comments
Package Body Temperature
+260
C
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AS1361/AS1362
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
VIN = VOUT +0.5V, CIN = 1F, COUT = 1F, CBYPASS = 10nF, TAMB = -40 to +85C (unless otherwise specified). Typ values are at TAMB = +25C. Limits 100% tested at +25C. Limits over operating temperature range guaranteed by design. Table 4. Electrical Characteristics Symbol VIN Parameter Input Voltage Range IOUT = 1mA, TAMB = +25C IOUT = 100A to 150mA, TAMB = +25C (AS1361) Output Voltage Accuracy IOUT = 100A to 300mA, TAMB = +25C (AS1362) IOUT = 100A to 150mA, (AS1361) IOUT = 100A to 300mA, (AS1362) IOUT ILIMIT Maximum Output Current Current Limit AS1361 AS1362 AS1361, OUT = 90% of nom., TAMB = +25C AS1362, OUT = 90% of nom., TAMB = +25C VOUT 3V, IOUT = 150mA VOUT 3V, IOUT = 300mA, AS1362 Dropout Voltage
1
Condition
Min 2 -0.5 -0.75 -1.0 -1.5 -2.0 150 300
Typ
Max 5.5 +0.5 +0.75 +1.0 +1.5 +2.0
Unit V
%
mA 270 510 70 140 90 170 140 270 40 150 0.02 0.0005 9 92 80 62 9 V dB 500 95 200 120 230 190 350 90 250 A %/V %/mA nA mV mA
2.5V VOUT < 3V, IOUT = 150mA 2.5V VOUT < 3V, IOUT = 300mA, AS1362 2.0V VOUT < 2.5V, IOUT = 150mA 2.0V VOUT < 2.5V, IOUT = 300mA, AS1362 IOUT = 0.05mA VIN = VOUTNOM - 0.1V, IOUT = 0mA VIN = (VOUT +0.5V) to 5.5V, IOUT = 0.1mA IOUT = 1 to 150/300mA SHDNN = 0V f = 1kHz, IOUT = 10mA f = 10kHz, IOUT = 10mA f = 100kHz, IOUT = 10mA f = 100Hz to 100kHz, ILOAD = 0 to 150/300mA
IQ VLNR VLDR ISHDNN PSRR
Quiescent Current Line Regulation Load Regulation Shutdown Supply Current Ripple Rejection
Output Noise Voltage (RMS) Shutdown Shutdown Exit Delay
2
RLOAD = 50 VIN = 2 to 5.5V VIN = 2 to 5.5V IOUT = 0, VOUTRISING Hysteresis, IOUT = 0 ISINK = 1mA VOUT in regulation 1.5 90 94 1.5
300 0.4
s V V
SHDNN Logic Low Level SHDNN Logic High Level Power-OK Output VPOK VOL Power-OK Voltage Threshold POK Output Voltage Low POK Output Leakage Current
98 0.3 1
% VOUT V A
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AS1361/AS1362
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 4. Electrical Characteristics (Continued) Symbol Parameter Thermal Shutdown Temperature Thermal Shutdown Hysteresis Condition Min Typ Max Unit Thermal Protection TSHDNM TSHDN
M
160 15
C C
1. Dropout is defined as VIN - VOUT when VOUT is 100mV below the value of VOUT for VIN = VOUT + 0.5V. 2. Time needed for VOUT to reach 90% of final value.
Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods.
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AS1361/AS1362
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
7 Typical Operating Characteristics
VIN = VOUT + 0.5V, CIN = COUT = 1F, CBYPASS = 10nF, TAMB = 25C (unless otherwise specified). Figure 3. Output Voltage vs. Input Voltage
3.5
Figure 4. Output Voltage Accuracy vs. Load Current
0.5
. Output Voltage Deviation (%)
3 0.4
IOUT = 150mA
Output Voltage (V) .
0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 0 50 100 150 200 250 300
Temp = 85C Temp = -45C Temp = 25C
2.5
IOUT = 300mA
2 1.5 1 0.5 0 0 1 2 3 4 5 6
Input Voltage (V)
Load Current (mA)
Figure 5. Output Voltage Accuracy vs. Temperature
1
Figure 6. Dropout Voltage vs. Load Current
140
.
0.8
Output Voltage Deviation (%)
0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 -40 -15 10 35 60 85
Dropout Voltage (mV) .
120 100 80 60 40 20 0 0 50 100 150 200 250 300
Temp = 85C Temp = 25C
Temp = -45C
Temperature (C)
Load Current (mA)
Figure 7. Dropout Voltage vs. Output Voltage
80
Dropout Voltage (mV) .
70 60 50 40 30 20 10 0 2 2.2 2.4 2.6 2.8 3 3.2
Output Voltage (V)
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AS1361/AS1362
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 8. Ground Pin Current vs. Input Voltage
150
Figure 9. Ground Pin Current vs. Load Current
80 75 70 65 60 55 50 45 40 35
.
Ground Pin Current (A)
100 75 50 25 0 0 1 2 3 4 5 6
IOUT= 300mA
IOUT = 150mA IOUT = 0mA
Ground Pin Current (A)
125
.
0
50
100
150
200
250
300
Input Voltage (V)
Load Current (mA)
Figure 10. Ground Pin Current vs. Temperature
50
Figure 11. PSRR vs. Frequency; IOUT = 10mA
100
.
45
Ground Pin Current (A)
80
40
PSRR (dB)
-15 10 35 60 85
60
35
40
30
20
25 -40
0 0.01
1
100
10000
Temperature (C)
Frequency (kHz)
Figure 12. Output Noise Spectral Density vs. Freq. .
10000
Figure 13. Output Noise vs. Bypass Capacitance
15 14 13
Output Noise Density (nV/ Hz)
. Noise (Vrms)
0.1 1 10 100 1000
12 11 10 9 8 7 6
100
10 0.01
5 1 10 100
Frequency (kHz)
Capacitance (nF)
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AS1361/AS1362
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 14. Load Transient Response, VIN = 3.8V, VOUT = 3.3V
Figure 15. Load Transient Response near Dropout, VIN = 3.4V, VOUT = 3.3V
20mA/Div
20mV/DIV
200s/Div
200s/Div
Figure 16. Line Transient Response
Figure 17. Enter & Exit Shutdown Delay
500mV/Div
VIN
SHDNN
20mV/DIV
VOUT
200s/Div
200s/Div
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2V/DIV
VOUT
POK
2V/Div
2V/Div
20mV/DIV
VOUT
VOUT
20mA/Div
IOUT
IOUT
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AS1361/AS1362
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1361/AS1362 are ultra-low-noise, low-dropout, low-quiescent current linear-regulators specifically designed for space-limited applications. The devices are available with preset output voltages from 1.5 to 4.5V in 50mV increments. These devices can supply loads up to 150/300mA. As shown in Figure 18, the AS1361/AS1362 consist of an integrated bandgap core and noise bypass circuitry, error amplifier, P-channel MOSFET pass transistor, and internal feedback voltage-divider. The output voltage is fed back through an internal resistor voltage-divider connected to pin OUT. An external bypass capacitor connected to pin BYPASS reduces noise at the output. Additional blocks include a current limiter, thermal sensor, and shutdown logic.
Internal Voltage Reference
The 1.25V bandgap reference is connected to the error amplifier's inverting input. The error amplifier compares this reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the pass-transistor gate is pulled low. This allows more current to pass to the output and increases the output voltage. If the feedback voltage is too high, the pass transistor gate is pulled high, allowing less current to pass to the output.
Internal P-Channel Pass Transistor
The AS1361/AS1362 feature a 0.5 (typ) P-channel MOSFET pass transistor, which provides several advantages over similar designs using a PNP pass transistor, including prolonged battery life. The P-channel MOSFET does not require a base driver, thus quiescent current is dramatically reduced. The AS1361/AS1362 LDOs do not exhibit problems associated with typical PNP-based LDOs, and consume only 40A of quiescent current in light load and 220A in dropout (see Typical Operating Characteristics on page 6).
Output Voltage
The AS1361/AS1362 deliver preset output voltages from 1.5 to 4.5V, in 50mV increments (see Ordering Information on page 14).
Shutdown
The AS1361/AS1362 feature a low-power shutdown mode that reduces quiescent current to <200nA. Driving SHDNN low disables the internal voltage reference, error amplifier, gate-drive circuitry, and P-channel MOSFET pass transistor (see Figure 18), and the device output enters a high-impedance state. Note: For normal operation connect pin SHDNN to pin IN.
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AS1361/AS1362
Datasheet - D e t a i l e d D e s c r i p t i o n
Figure 18. AS1361/AS1362 - Block Diagram
AS1361/AS1362
IN
SHDNN
Shutdown and Power-Down Control
+
Error Amp
MOS Driver w/ ILIMIT
Thermal Sensor 1.25 Reference and Noise Bypass
OUT
BYPASS - 95% GND +
POK
Power-OK
The power-ok circuitry is built around an N-channel MOSFET. The circuitry monitors the output voltage and if the voltage goes out of regulation (e.g. during dropout, current limit, or thermal shutdown) pin POK goes low. The power-OK feature is not active during shutdown and provides a power-on-reset (POR) function that can operate down to VIN = 1V. A capacitor to GND may be added to generate a POR delay. To obtain a logic-level output, connect a pull-up resistor from pin POK to pin OUT. Larger values for this resistor will help minimize current consumption; a 100k resistor is perfect for most applications (see Figure 1 on page 1).
Current Limit
The AS1361/AS1362 include a current limiting circuitry to monitor and control the P-channel MOSFET pass transistor's gate voltage, thus limiting the device output current to 270mA (AS1361) and 510mA (AS1362). Note: See Table 4 on page 4 for the recommended min and max current limits. The output can be shorted to ground indefinitely without causing damage to the device.
Thermal Protection
Integrated thermal protection circuitry limits total power dissipation in the AS1361/AS1362. When the junction temperature (TJ) exceeds +160C, the thermal sensor signals the shutdown logic, turning off the P-channel MOSFET pass transistor and allowing the device to cool down. The thermal sensor turns the pass transistor on again after the device's junction temperature drops by 10C, resulting in a pulsed output during continuous thermal-overload conditions. Note: Thermal protection is designed to protect the devices in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction temperature rating of +150C.
Operating Region and Power Dissipation
The AS1361/AS1362 maximum power dissipation is dependant on the thermal resistance of the case and PCB, the temperature difference between the die junction and TAMB, and airflow rate. Power dissipation across the device is calculated as: (EQ 1) PD = IOUT (VIN - VOUT)
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AS1361/AS1362
Datasheet - D e t a i l e d D e s c r i p t i o n
The maximum power dissipation is calculated: PDMAX = (TJ - TAMB)/(JC + CA) Where: TJ - TAMB is the temperature difference between the AS1361/AS1362 die junction and the surrounding air; JC is the thermal resistance of the package; CA is the thermal resistance through the PC board/copper traces/other materials to the surrounding air. Note: Pin GND of the AS1361/AS1362 provides the electrical connection to system ground and also serves as a heat sink. Connect pin GND to the system ground using a large pad or ground plane. (EQ 2)
Noise Reduction
The AS1361/AS1362 noise bypass circuitry dramatically reduces output noise, exhibiting 9VRMS of output voltage noise with CBYPASS = 0.01F and COUT = 1F. Use an external 0.01F bypass capacitor between pin BYPASS and pin OUT (see Figure 1 on page 1). Note: Startup time is minimized by internal power-on circuitry which pre-charges CBYPASS.
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AS1361/AS1362
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
Capacitor Selection and Regulator Stability
For normal operation, use a 1F capacitor at pin IN and a 1F capacitor at pin OUT. Larger input capacitor values and lower ESR provide better noise rejection and line-transient response. Reduce output noise and improve load-transient response, stability, and power-supply rejection by using large output capacitors. Note: Some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. With dielectrics such as Z5U and Y5V, it may be necessary to use a 2.2F or larger output capacitor to ensure stability at temperatures below -10C. With X7R or X5R dielectrics, 1F is sufficient at all operating temperatures.
Bypass Capacitor
Use a 0.01F bypass capacitor at pin BYPASS for low-output voltage noise reduction. The leakage current going into pin BYPASS should be less than 10nA. Increasing the capacitance slightly decreases the output noise. Values above 0.1F and below 0.001F are not recommended.
Noise, PSRR, and Transient Response
The AS1361/AS1362 are designed to deliver ultra-low noise and high PSRR, as well as low dropout and low quiescent currents in battery-powered systems. The power-supply rejection is 92dB at 1kHz and 62dB at 100kHz. (see PSRR vs. Frequency; IOUT = 10mA on page 7). When operating from sources other than batteries, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output capacitors, and through passive filtering techniques. The Figure 16 and Figure 14 on page 8 show the AS1361/AS1362 line- and load-transient responses.
Dropout Voltage
The AS1361/AS1362 minimum dropout voltage determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Since the AS1361/AS1362 use a P-channel MOSFET pass transistor, the dropout voltage is a function of drain-tosource on-resistance (RDS(ON)) multiplied by ILOAD (see Figure 6 on page 6).
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AS1361/AS1362
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
10 Package Drawings and Markings
The devices are available in a TSOT23 6-pin package. Figure 19. TSOT23 6-pin Package
Symbol A A1 A2 b b1 c c1 D E E1 e e1 Notes:
Min 0.01 0.84 0.30 0.31 0.12 0.08
Typ 0.05 0.87 0.35 0.15 0.13 2.90BSC 2.80BSC 1.60BSC 0.95BSC 1.90BSC
Max 1.00 0.10 0.90 0.45 0.39 0.20 0.16
Notes
Symbol L L1 L2 N R R1
Min 0.30
Typ 0.40 0.60REF 0.25BSC 6
Max 0.50
Notes
0.10 0.10 0 4
0.25 8
3,4 3,4 3,4
1
aaa bbb ccc ddd
4 10 12 Tolerances of Form and Position 0.15 0.25 0.10 0.20
1. Dimensioning and tolerancing conform to ASME Y14.5M - 1994. 2. Dimensions are in millimeters. 3. Dimension D does not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, and gate burrs shall not exceed 0.15mm per end. Dimension E1 does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.15mm per side. Dimensions D and E1 are determined at datum H. 4. The package top can be smaller than the package bottom. Dimensions D and E1 are determined at the outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs, and interlead flash, but include any mistmatches between the top of the package body and the bottom. D and E1 are determined at datum H.
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AS1361/AS1362
Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The devices are available as the standard products shown in Table 5. Table 5. Ordering Information Ordering Code AS1361-BTTT-15 AS1361-BTTT-18 AS1361-BTTT-25 AS1361-BTTT-26 AS1361-BTTT-27 AS1361-BTTT-28 AS1361-BTTT-285 AS1361-BTTT-30 AS1361-BTTT-33 AS1361-BTTT-45 AS1362-BTTT-15 AS1362-BTTT-18 AS1362-BTTT-25 AS1362-BTTT-26 AS1362-BTTT-27 AS1362-BTTT-28 AS1362-BTTT-285 AS1362-BTTT-30 AS1362-BTTT-33 AS1362-BTTT-45 Marking ASL2 ASL3 ASL4 ASL5 ASL6 ASL7 ASL8 ASL9 ASMA ASMB ASMC ASMD ASME ASMF ASMG ASMH ASMI ASMJ ASMK ASML Output Current 150mA 150mA 150mA 150mA 150mA 150mA 150mA 150mA 150mA 150mA 300mA 300mA 300mA 300mA 300mA 300mA 300mA 300mA 300mA 300mA Output Voltage 1.5V 1.8V 2.5V 2.6V 2.7V 2.8V 2.85V 3.0V 3.3V 4.5V 1.5V 1.8V 2.5V 2.6V 2.7V 2.8V 2.85V 3.0V 3.3V 4.5V Delivery Form Package
Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin Tape and Reel TSOT23 6-pin
Non-standard devices from 1.5V to 4.5V are available in 50mV steps. For more information and inquiries contact http://www.austriamicrosystems.com/contact
Note: All products are RoHS compliant and Pb-free. Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect For further information and requests, please contact us mailto:sales@austriamicrosystems.com or find your local distributor at http://www.austriamicrosystems.com/distributor
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AS1361/AS1362
Datasheet
Copyrights
Copyright (c) 1997-2009, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters austriamicrosystems AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact
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