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TC57
Line Regulator Controller
Features
* Low Dropout Voltage: 100mV @ 650mA with FZT749 PNP Transistor * 2.7V to 8V Supply Range * Low Operating Current: 50A Operating, 0.2A Shutdown * Low True Chip Enable * Output Accuracy < 2% * Small Package: 5-Pin SOT-23A
General Description
The TC57 is a low dropout regulator controller that operates with an external PNP pass transistor, allowing the user to tailor the LDO characteristics to suit the application at hand. This results in lower dropout operation (and often lower cost) compared with traditional linear regulators with on-board pass transistors. The maximum output current of a TC57based regulator circuit is limited only by the characteristics of the external pass transistor. For example, a maximum output current of 650mA (with a dropout voltage of 100mV) results when an FZT749 pass transistor is used, while a Darlington configuration can deliver up to 4A. Flexibility, and superior performance make this family of regulator controllers the ideal choice in applications where low dropout voltage and low installed cost are key.
Applications
* * * * * Battery Operated Systems Portable Instruments High-Efficiency Linear Regulator Post-Regulator for SMPS Power Supply or Battery Back-Up Supply for Memory
Device Selection Table
Output Part Number Voltage TC572502ECT TC573002ECT TC573302ECT 2.5V 3.0V 3.3V Package Temperature Range
Functional Block Diagram
VIN +3.3V FZT749 Q1 VOUT +3V
5-Pin SOT-23A -40C to +85C 5-Pin SOT-23A -40C to +85C 5-Pin SOT-23A -40C to +85C
RBE 47K CIN 10F (Tantalum)
RB 1K 4 EXT VIN
2
VOUT
3
CL 10F (Tantalum)
RL
OFF
TC573002ECT
ON 5 SHDN GND 1
Other output voltages and package options are available. Please contact Microchip Technology Inc. for details.
Package Type
3.3V Line Input, 3.0V, 500mA Output LDO
5-Pin SOT-23A
SHDN 5 EXT 4
TC57
1 GND 2 VIN 3 VOUT
NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A.
2002 Microchip Technology Inc.
DS21437B-page 1
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TC57
1.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage ........................................................+12V Output Current .................................................... 50mA Output Voltage............................. -0.3V to (VIN + 0.3V) Power Dissipation.............................................150mW Operating Temperature Range............. -40C to +85C Storage Temperature Range .............. -40C to +150C
*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 operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability.
TC55 ELECTRICAL SPECIFICATIONS
TC57EP3002 Electrical Characteristics: SHDN = GND, VIN = VOUT + 1V, VOUT = 3V to 5V, IOUT = 0, TA = 25C, Test Circuit of Figure 3-1, unless otherwise noted. (Note 2) Symbol VIN VEXT VOUT V OUT VIN - VOUT IDD ISHDN Parameter Input Voltage Voltage on EXT Output Output Voltage Load Regulation Dropout Voltage Supply Current Shutdown Supply Current Min -- -- -60 -- -- -- -- -- -- -- 1.5 -- -- -0.2 Typ -- -- -- 100 50 -- 0.1 100 -- -- -- -- -- -0.05 Max 8 8 60 -- 80 0.6 0.3 -- 0.5 25 -- 0.25 0.1 0 Units V V V mV mV A A %/V ppm/C A mA V V A A VSHDN = VIN = 5V VSHDN = GND Note 4 IOUT = 50mA (Note 1) 1mA IOUT 100mA (Note 3) IOUT = 100mA (Note 2) VSHDN = VIN = 5V VSHDN = GND IOUT = 50mA, 4V VIN 8V (Note 3) IOUT = 10mA, -40C < TJ < +85C (Note 3) Test Conditions
0.98 X VR VR 0.5% 1.02 X VR
V OUT/VIN Line Regulation VOUT/T ILEXT IEXT VIH VIL IIH IIL
Note 1: 2: 3: 4:
VOUT Temperature Coefficient EXT Pin Leakage Current EXT Sink Current SHDN Input High Logic Threshold SHDN Input Low Logic Threshold SHDN Input Current @ VIH SHDN Input Current @ VIL
VR is the regulator output voltage setting. Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at a 1V differential. Varies with type of pass transistor used. Numbers shown are for the test circuit of Figure 3-1. The product of IEXT X VEXT must be less than the maximum allowable power dissipation.
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DS21437B-page 2
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TC57
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No. (5-Pin SOT-23A) 1 2 3 4 5
PIN FUNCTION TABLE
Symbol GND VIN VOUT EXT SHDN Ground terminal. Supply voltage input. Positive input voltage of 2.7V to 8.0V. Regulator voltage sense input. Connects to the collector of the external PNP pass transistor. Base Drive for the external PNP pass transistor. Shutdown Input. The device is enabled when SHDN VIL. The device enters a low power shutdown state when SHDN VIH . During shutdown, the output is disabled, and supply current falls to less than 1A. Description
2002 Microchip Technology Inc.
DS21437B-page 3
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TC57
3.0 DETAILED DESCRIPTION
3.2 Base-Current Limiting Resistor
The TC57 series of precision low dropout regulator controllers use an external PNP transistor to accommodate a wide range of output currents. A series resistor (RB) limits the maximum base current drawn from the PNP transistor. Limiting the base drive both determines the regulator's output current capability, as well as limits ground current when the device is operated in dropout. The PNP transistor's VCE(SAT) is the only factor limiting dropout voltage. Base current limiting resistor R B can be estimated using:
EQUATION 3-3:
RB = Where: hFE is the current gain of the pass transistor VIN Is the input voltage (in volts) hFE (VIN - VBE) IOUT
FIGURE 3-1:
VIN
TEST CIRCUIT
FZT749 Q1 VOUT
VBE is the base-emitter voltage at the desired output current (in volts) IOUT is the output current (in Amps) For example, assume a desired continuous output current of 1.0A, an input voltage of 5V, and an FZT749 pass transistor. The FZT749 has a typical hFE of 170, and a VBE of 0.8V; both specified at a collector current of 1.0A. Substituting these values into the equation above results in an RB value of 704 (closest standard value = 680).
RBE 33K CIN 10F (Tantalum)
RB 680 4 VOUT 3
EXT 2V IN OFF ON 5
CL 10F (Tantalum)
RL
TC573002ECT
SHDN GND 1
3.3 3.1 Transistor Selection
The PNP pass transistor must have satisfactory power dissipation, current gain, and collector current specifications to suit the application at hand. The maximum output current the circuit can deliver is influenced by hFE. The highest guaranteed output current is given by:
Pull-Up Resistor and Output Capacitor
EQUATION 3-1:
ILOAD(MAX) = 25 mA x hFE(MIN) The transistor's actual power dissipation (PD) is equal to the maximum load current times the maximum input/ output voltage differential, or:
A pull-up resistor (RBE, installed between the base and emitter of the pass transistor) facilitates rapid turn-off of the pass transistor in the event of a sudden decrease in load (Figure 3-2). Recommended values for this resistor are between 20K and 47K. A Tantalum output capacitor of at least 10F must be used to guarantee stability. Higher values decrease output noise and eliminate power-on overshoot, but extend power-up times. Table 3-1 lists several capacitor choices.
FIGURE 3-2:
3.3V, 1A REGULATOR USING 5V SUPPLY INPUT
FZT749 Q1 VOUT = 3.3V
EQUATION 3-2:
PD ILOAD(MAX) x (VIN(MAX) - VOUT(MIN)) The ideal transistor has a minimum hFE of 100, and a VCE(SAT) of less than 0.6V at full output current. For example, the Zetex FZT749 has an hFE of 170 at a collector current of 1A, and a guaranteed VCE(SAT) of 0.3V at a base current of 100mA. It is packaged in a SOT-223 and is recommended for use with the TC57. Other transistors are also suitable, depending on the required input and output voltages and output current (Table 3-1).
VIN = 5V
CIN 10F (Tantalum)
RBE 33K
RB 680 4 EXT
COUT 10F (Tantalum)
2V IN 1 5 GND SHDN
VOUT 3
TC57
OFF ON
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TC57
3.4 Input Capacitor 3.5 Shutdown Mode
The addition of an input capacitor further reduces output noise, and negates the effects of power supply input impedance. A 10F (min) Tantalum capacitor is recommended. The TC57 enters a low power shutdown mode when the shutdown input (SHDN) is high. During shutdown, the regulator is disabled, the output capacitor is discharged through the load, and supply current to the TC57 decreases to less than 1A. Normal operation resumes when SHDN is brought low. If the shutdown mode is not used, SHDN should be tied to VIN.
TABLE 3-1:
COMPONENT SUPPLIERS
Mounting Method Manufacturer Website
Device CAPACITORS 267 Series F95 Tantalum Series 595 Tantalum Series OS-CON Series LXF Series TRANSISTORS ZTX749 2N4403 2N2907A FZT749
Surface Mount Surface Mount Surface Mount Through-Hole Through-Hole Through-Hole Through-Hole Through-Hole Surface Mount
Matsuo Nichicon Sprague Sanyo United Chemi-Con Zetex ON SEMI ON SEMI Zetex
http://www.matsuoelectronics.com http://www.nichicon-us.com http://www.vishay.com/brands/sprague http://www.sanyovideo.com http://chemi-con.com http://www.zetex.com http://www.onsemi.com/home http://www.onsemi.com/home http://www.zetex.com
2002 Microchip Technology Inc.
DS21437B-page 5
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TC57
4.0
Note:
TYPICAL CHARACTERISTICS
The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
1. OUTPUT VOLTAGE vs. OUTPUT CURRENT
TC575002 (5V)
TA = 25C VIN = 6V, CL = 10F (Tantalum) 5.1 OUTPUT VOLTAGE VOUT (V) OUTPUT VOLTAGE VOUT (V) 4.1 OUTPUT VOLTAGE VOUT (V)
TC574002 (4V)
TA = 25C VIN = 5V, CL = 10F (Tantalum) 3.4
TC573302 (3.3V)
TA = 25C VIN = 4.3V, CL = 10F (Tantalum)
5.0
4.0
3.3
4.9
3.9
3.2
4.8
3.8
3.1
4.7 0 100 200 300 400 500 OUTPUT CURRENT IOUT (mA)
3.7 0 100 200 300 400 500 OUTPUT CURRENT IOUT (mA)
3.0 0 100 200 300 400 500 OUTPUT CURRENT IOUT (mA)
2. OUTPUT VOLTAGE vs. INPUT VOLTAGE
TC575002 (5V)
CL = 10F (Tantalum), TA = 25C 5.2 OUTPUT VOLTAGE VOUT (V) OUTPUT VOLTAGE VOUT (V) IOUT = 1mA 500mA 5.10 IOUT = 1mA 500mA 100mA 4.95 OUTPUT VOLTAGE VOUT (V)
TC575002 (5V)
CL = 10F (Tantalum), TA = 25C 4.2
TC574002 (4V)
CL = 10F (Tantalum), TA = 25C
5.0 4.8
5.05
4.0 3.8
IOUT = 1mA A 500mA
5.00
4.6
3.6 100mA 3.4 3.2 3.5
100mA
4.4 4.2 4.5
4.90 4.85
5.0 INPUT VOLTAGE VIN (V)
5.5
5
6
7
8
4.0 INPUT VOLTAGE VIN (V)
4.5
INPUT VOLTAGE VIN (V)
TC574002 (4V)
CL = 10F (Tantalum), TA = 25C 4.10 OUTPUT VOLTAGE VOUT (V) OUTPUT VOLTAGE VOUT (V) 3.5
TC573302 (3.3V)
CL = 10F (Tantalum), TA = 25C 3.40 OUTPUT VOLTAGE VOUT (V)
TC573302 (3.3V)
CL = 10F (Tantalum), TA = 25C
4.05 IOUT = 1mA
3.3 IOUT = 1mA 3.1 500mA
3.35 IOUT = 1mA, 100mA 3.30 500mA 3.25
4.00
3.95
100mA, 500mA
2.9 100mA 2.7 2.5 2.8
3.90 3.85 4 5 6 7 INPUT VOLTAGE VIN (V)
3.20 3.15
3.3 INPUT VOLTAGE VIN (V)
3.8
3
4 5 INPUT VOLTAGE VIN (V)
6
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DS21437B-page 6
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TC57
4.0 TYPICAL CHARACTERISTICS (CONTINUED)
3. DROPOUT VOLTAGE vs. OUTPUT CURRENT
TC575002 (5V)
CL = 10F (Tantalum) 1.0 DROPOUT VOLTAGE VIN -VOUT DROPOUT VOLTAGE VIN -VOUT 1.0 DROPOUT VOLTAGE VIN -VOUT 0.8 0.6
TC574002 (4V)
CL = 10F (Tantalum) 1.0 0.8
TC573302 (3.3V)
CL = 10F (Tantalum)
0.8
0.6 80C
0.6
0.4 0.2 0.0 0 200
TOPR = 25C
0.4 TOPR = 25C R 0.2 0.0
80C
0.4 0.2
80C TOPR = 25C 25
-30C 3 400 600 800 1000
-30C 0 0 200 400 600 800 1000
-30C 0.0 0 200 400 600 800 1000 OUTPUT CURRENT IOUT (mA)
OUTPUT CURRENT IOUT (mA)
OUTPUT CURRENT IOUT (mA)
4. SUPPLY CURRENT vs. INPUT VOLTAGE
TC575002 (5V)
50
SUPPLY CURRENT IDD (A) SUPPLY CURRENT IDD (A)
TC574002 (4V)
50
SUPPLY CURRENT IDD (A)
TC573302 (3.3V)
50
40 TOPR = 25C, 80C 30 -30C 20
40
40 30 TOPR = 25C, 80C
30
TOPR = 25C, 80C -30C
20
20
-30C
10 0 5 6 7 8 INPUT VOLTAGE VIN (V)
10 0 4 5 6 7 INPUT VOLTAGE VIN (V)
10 0 3 4 6 5 INPUT VOLTAGE VIN (V)
5. OUTPUT VOLTAGE vs. AMBIENT TEMPERATURE
TC575002 (5V)
VIN = 6.0V IOUT = 100mA, CL = 10F (Tantalum) 5.10 OUTPUT VOLTAGE VOUT (V) OUTPUT VOLTAGE VOUT (V) 4.10 OUTPUT VOLTAGE VOUT (V)
TC574002 (4V)
VIN = 5.0V IOUT = 100mA, CL = 10F (Tantalum) 3.40
TC573302 (3.3V)
VIN = 4.3V IOUT = 100mA, CL = 10F (Tantalum)
5.05
4.05
3.35
5.00
4.00
3.30
4.95
3.95
3.25
4.90 -40
-20
0
20
40
60
80
3.90 -40
3.20 -20 20 40 60 0 AMBIENT TEMP. TA (C) 80 -40 -20 0 20 40 60 80 AMBIENT TEMP. TA (C)
AMBIENT TEMP. TA (C)
2002 Microchip Technology Inc.
DS21437B-page 7
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TC57
4.0 TYPICAL CHARACTERISTICS (CONTINUED)
6. SUPPLY CURRENT vs. AMBIENT TEMPERATURE
TC575002 (5V)
VIN = 6V 50
SUPPLY CURRENT IDD (A) SUPPLY CURRENT IDD (A)
TC574002 (4V)
VIN = 5V 50
SUPPLY CURRENT IDD (A)
TC573302 (3.3V)
50 40 VIN = 4.3V
40
40 30
30
30
20 10 0 -40
20
20 10
10 0
0 -40 -20 0 20 40 60 80 -40 AMBIENT TEMP. TA (C) 0 20 40 60 -20 AMBIENT TEMP. TA (C) 80
-20
0
20
40
60
80
AMBIENT TEMP. TA (C)
7. INPUT TRANSIENT RESPONSE
TC575002 (5V)
IOUT = 10mA, CL = 10F (Tantalum) 8 INPUT VOLTAGE VIN (V) Input Voltage 5.3 5.4 OUTPUT VOLTAGE VOUT (V) INPUT VOLTAGE VIN (V) 8 Input Voltage 5.3
TC575002 (5V)
IOUT = 100mA, CL = 10F (Tantalum) 5.4 OUTPUT VOLTAGE VOUT (V) OUTPUT VOLTAGE VOUT (V)
7
7
6
5.2
6
5.2
5
Output Voltage
5.1
5
Output Voltage
5.1
4 3 Time (0.4 msec/div)
5.0 4.9
4 3 Time (0.4 msec/div)
5.0 4.9
TC574002 (4V)
7 INPUT VOLTAGE VIN (V) IOUT = 10mA, CL = 10F (Tantalum) 4.4 INPUT VOLTAGE VIN (V) Input Voltage 6 4.3 OUTPUT VOLTAGE VOUT (V) 7
TC574002 (4V)
IOUT = 100mA, CL = 10F (Tantalum) 4.4 Input Voltage 6 4.3
5
4.2
5
4.2
4
Output Voltage
4.1
4
Output Voltage
4.1
3 2 Time (0.4 msec/div)
4.0 3.9
3 2 Time (0.4 msec/div)
4.0 3.9
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2002 Microchip Technology Inc.
TC57
4.0 TYPICAL CHARACTERISTICS (CONTINUED)
7. INPUT TRANSIENT RESPONSE (CONT.)
TC573302 (3.3V)
IOUT = 10mA, CL = 10F (Tantalum) 6 Input Voltage INPUT VOLTAGE VIN (V) 5 3.6 3.7 OUTPUT VOLTAGE VOUT (V) INPUT VOLTAGE VIN (V) 6 Input Voltage 5 3.6
TC573302 (3.3V)
IOUT = 100mA, CL = 10F (Tantalum) 3.7 OUTPUT VOLTAGE VOUT (V)
OUTPUT CURRENT IOUT (mA)
4
3.5
4
3.5
3
Output Voltage
3.4
3
Output Voltage
3.4
2 1 Time (0.4 msec/div)
3.3 3.2
2 1 Time (0.4 msec/div)
3.3 3.2
8. LOAD TRANSIENT RESPONSE
TC575002 (5V)
VIN = 6V, CL = 10F (Tantalum) 5.10
OUTPUT VOLTAGE VOUT (V)
TC574002 (4V)
VIN = 5V, CL = 10F (Tantalum) 1000
OUTPUT CURRENT IOUT (mA) OUTPUT VOLTAGE VOUT (V)
4.10 4.05
1000 800
5.05
Output Voltage
800
5.00
600
4.00
Output Voltage
600
4.95 300mA 4.90 4.85 1mA
Output Current
400
3.95 300mA 3.90 3.85 1mA
400 Output Current 200 0 Time (10 msec/div)
200 0 Time (10 msec/div)
TC573302 (3.3V)
VIN = 4.3V, CL = 10F (Tantalum) 3.40
OUTPUT VOLTAGE VOUT (V)
1000 Output Voltage
OUTPUT CURRENT IOUT (mA)
3.35
800
3.30
600
3.25 300mA 3.20 3.15 1mA
Output Current
400
200 0 Time (10 msec/div)
2002 Microchip Technology Inc.
DS21437B-page 9
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TC57
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
2
represents first decimal of output voltage Symbol Voltage .0 .1 .2 .3 .4 Symbol 5 6 7 8 9 Voltage .5 .6 .7 .8 .9
3
0 1 2 3 4
3
1
represents integer part of output voltage Symbol 2 3 4 5 6 Voltage 2. 3. 4. 5. 6.
represents production lot ID code
5.2
Taping Form
Component Taping Orientation for 5-Pin SOT-23A (EIAJ SC-74A) Devices
User Direction of Feed
Device Marking
W
PIN 1
P Standard Reel Component Orientation TR Suffix Device (Mark Right Side Up)
Carrier Tape, Number of Components Per Reel and Reel Size
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
5-Pin SOT-23A
8 mm
4 mm
3000
7 in
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DS21437B-page 10
2002 Microchip Technology Inc.
TC57
5.3 Package Dimensions
SOT-23A-5
.075 (1.90) REF.
.122 (3.10) .098 (2.50) .020 (0.50) .012 (0.30) PIN 1 .122 (3.10) .106 (2.70) .057 (1.45) .035 (0.90) .006 (0.15) .000 (0.00)
.071 (1.80) .059 (1.50)
.037 (0.95) REF.
10 MAX. .024 (0.60) .004 (0.10)
.010 (0.25) .004 (0.09)
Dimensions: inches (mm)
2002 Microchip Technology Inc.
DS21437B-page 11
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TC57
NOTES:
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DS21437B-page 12
2002 Microchip Technology Inc.
TC57
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART CODE TC57
Output Voltage: Ex: 30 = 3.0V Tolerance: 2 = 2% Temperature/Package: E: -40C to +85C CT: 5-Pin SOT-23A Taping Direction: TR: Standard Taping
XX
02
ECT
XX
Sales and Support
Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. 2. 3. Your local Microchip sales office The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using. New Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
2002 Microchip Technology Inc.
DS21437B-page13
TC57
NOTES:
DS21437B-page14
2002 Microchip Technology Inc.
TC57
Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip's products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights.
Trademarks The Microchip name and logo, the Microchip logo, FilterLab, KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER, PICSTART, PRO MATE, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, MXDEV, MXLAB, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. Serialized Quick Turn Programming (SQTP) is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. (c) 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received QS-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona in July 1999 and Mountain View, California in March 2002. The Company's quality system processes and procedures are QS-9000 compliant for its PICmicro (R) 8-bit MCUs, KEELOQ(R) code hopping devices, Serial EEPROMs, microperipherals, non-volatile memory and analog products. In addition, Microchip's quality system for the design and manufacture of development systems is ISO 9001 certified.
2002 Microchip Technology Inc.
DS21437B-page 15
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