TC4426/TC4427/TC4428 1.5A Dual High-Speed Power MOSFET Drivers Features: General Description: • High Peak Output Current – 1.5A • Wide Input Supply Voltage Operating Range: - 4.5V to 18V • High Capacitive Load Drive Capability – 1000 pF in 25 ns (typ.) • Short Delay Times – 40 ns (typ.) • Matched Rise and Fall Times • Low Supply Current: - With Logic ‘1’ Input – 4 mA - With Logic ‘0’ Input – 400 μA • Low Output Impedance – 7Ω • Latch-Up Protected: Will Withstand 0.5A Reverse Current • Input Will Withstand Negative Inputs Up to 5V • ESD Protected – 4 kV • Pin-compatible with the TC426/TC427/TC428 • Space-saving 8-Pin MSOP and 8-Pin 6x5 DFN Packages The TC4426/TC4427/TC4428 are improved versions of the earlier TC426/TC427/TC428 family of MOSFET drivers. The TC4426/TC4427/TC4428 devices have matched rise and fall times when charging and discharging the gate of a MOSFET. These devices are highly latch-up resistant under any conditions within their power and voltage ratings. They are not subject to damage when up to 5V of noise spiking (of either polarity) occurs on the ground pin. They can accept, without damage or logic upset, up to 500 mA of reverse current (of either polarity) being forced back into their outputs. All terminals are fully protected against Electrostatic Discharge (ESD) up to 4 kV. The TC4426/TC4427/TC4428 MOSFET drivers can easily charge/discharge 1000 pF gate capacitances in under 30 ns. These devices provide low enough impedances in both the on and off states to ensure the MOSFET’s intended state will not be affected, even by large transients. Other compatible drivers are the TC4426A/TC4427A/ TC4428A family of devices. The TC4426A/TC4427A/ TC4428A devices have matched leading and falling edge input-to-output delay times, in addition to the matched rise and fall times of the TC4426/TC4427/ TC4428 devices. Applications: • Switch Mode Power Supplies • Line Drivers • Pulse Transformer Drive Package Types 8-Pin MSOP/ PDIP/SOIC TC4426 TC4427 TC4428 NC IN A GND IN B 1 8 NC 2 TC4426 7 OUT A 3 TC4427 6 VDD 4 TC4428 5 OUT B NC OUT A VDD OUT B NC OUT A VDD OUT B 8-Pin DFN(1) NC 1 IN A 2 GND 3 TC4426 TC4427 TC4428 IN B 4 TC4426 TC4427 TC4428 8 NC NC NC 7 OUT A OUT A OUT A 6 VDD VDD VDD 5 OUT B OUT B OUT B Note 1: Exposed pad of the DFN package is electrically isolated. © 2006 Microchip Technology Inc. DS21422D-page 1 TC4426/TC4427/TC4428 Functional Block Diagram Inverting VDD 1.5 mA 300 mV Output Non-Inverting Input Effective Input C = 12 pF (Each Input) 4.7V TC4426/TC4427/TC4428 GND Note 1: TC4426 has two inverting drivers, while the TC4427 has two non-inverting drivers. The TC4428 has one inverting and one non-inverting driver. 2: Ground any unused driver input. DS21422D-page 2 © 2006 Microchip Technology Inc. TC4426/TC4427/TC4428 1.0 ELECTRICAL CHARACTERISTICS PIN FUNCTION TABLE Name Absolute Maximum Ratings † NC Supply Voltage ..................................................... +22V Input Voltage, IN A or IN B ..................................... (VDD + 0.3V) to (GND – 5V) Package Power Dissipation (TA ≤ 70°C) DFN .............................................................. Note 3 MSOP .......................................................... 340 mW PDIP ............................................................ 730 mW SOIC............................................................ 470 mW Function No Connection IN A Input A GND Ground IN B Input B OUT B Output B VDD Supply Input OUT A Output A NC No Connection Storage Temperature Range.............. -65°C to +150°C Maximum Junction Temperature ...................... +150°C † 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. DC CHARACTERISTICS Electrical Specifications: Unless otherwise noted, TA = +25ºC with 4.5V ≤ VDD ≤ 18V. Parameters Sym Min Typ Max Units Conditions Logic ‘1’, High Input Voltage VIH 2.4 — — V Logic ‘0’, Low Input Voltage VIL — — 0.8 V Input Current IIN -1.0 — +1.0 μA 0V ≤ VIN ≤ VDD VOH VDD – 0.025 — — V DC Test Low Output Voltage VOL — — 0.025 V DC Test Output Resistance RO — 7 10 Ω IOUT = 10 mA, VDD = 18V Peak Output Current IPK — 1.5 — A VDD = 18V Latch-Up Protection Withstand Reverse Current IREV — > 0.5 — A Duty cycle ≤ 2%, t ≤ 300 μs VDD = 18V Rise Time tR — 19 30 ns Figure 4-1 Fall Time tF — 19 30 ns Figure 4-1 Delay Time tD1 — 20 30 ns Figure 4-1 Delay Time tD2 — 40 50 ns Figure 4-1 IS — — — — 4.5 0.4 mA VIN = 3V (Both inputs) VIN = 0V (Both inputs) Input Note 2 Output High Output Voltage Switching Time (Note 1) Power Supply Power Supply Current Note 1: 2: 3: Switching times ensured by design. For V temperature range devices, the VIH (Min) limit is 2.0V. Package power dissipation is dependent on the copper pad area on the PCB. © 2006 Microchip Technology Inc. DS21422D-page 3 TC4426/TC4427/TC4428 DC CHARACTERISTICS (OVER OPERATING TEMPERATURE RANGE) Electrical Specifications: Unless otherwise noted, over operating temperature range with 4.5V ≤ VDD ≤ 18V. Parameters Sym Min Typ Max Units Conditions Input Logic ‘1’, High Input Voltage VIH 2.4 — — V Logic ‘0’, Low Input Voltage VIL — — 0.8 V Input Current IIN -10 — +10 μA High Output Voltage VOH VDD – 0.025 — — V DC Test Low Output Voltage VOL — — 0.025 V DC Test Note 2 0V ≤ VIN ≤ VDD Output Output Resistance RO — 9 12 Ω IOUT = 10 mA, VDD = 18V Peak Output Current IPK — 1.5 — A VDD = 18V Latch-Up Protection Withstand Reverse Current IREV — >0.5 — A Duty cycle ≤ 2%, t ≤ 300 μs VDD = 18V Rise Time tR — — 40 ns Figure 4-1 Fall Time tF — — 40 ns Figure 4-1 Delay Time tD1 — — 40 ns Figure 4-1 Delay Time tD2 — — 60 ns Figure 4-1 IS — — — — 8.0 0.6 mA VIN = 3V (Both inputs) VIN = 0V (Both inputs) Switching Time (Note 1) Power Supply Power Supply Current Note 1: 2: Switching times ensured by design. For V temperature range devices, the VIH (Min) limit is 2.0V. TEMPERATURE CHARACTERISTICS Electrical Specifications: Unless otherwise noted, all parameters apply with 4.5V ≤ VDD ≤ 18V. Parameters Sym Min Typ Max Units Specified Temperature Range (C) TA 0 — +70 °C Specified Temperature Range (E) TA -40 — +85 °C Specified Temperature Range (V) TA -40 — +125 °C Conditions Temperature Ranges Maximum Junction Temperature TJ — — +150 °C Storage Temperature Range TA -65 — +150 °C Thermal Resistance, 8L-6x5 DFN θJA — 33.2 — °C/W Thermal Resistance, 8L-MSOP θJA — 206 — °C/W Thermal Resistance, 8L-PDIP θJA — 125 — °C/W Thermal Resistance, 8L-SOIC θJA — 155 — °C/W Package Thermal Resistances DS21422D-page 4 © 2006 Microchip Technology Inc. TC4426/TC4427/TC4428 2.0 TYPICAL PERFORMANCE CURVES Note: 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. Note: Unless otherwise indicated, TA = +25ºC with 4.5V ≤ VDD ≤ 18V. 100 100 2200 pF 2200 pF 80 1500 pF 1500 pF tFALL (nsec) tRISE (nsec) 80 60 1000 pF 40 60 1000 pF 40 470 pF 470 pF 20 20 100 pF 100 pF 0 0 4 6 FIGURE 2-1: Voltage. 8 10 14 12 VDD (V) 16 18 Rise Time vs. Supply 100 4 14 16 18 Fall Time vs. Supply 5V tFALL (nsec) tRISE (nsec) 12 VDD (V) 80 10V 15V 40 20 60 10V 15V 40 20 0 100 1000 CLOAD (pF) FIGURE 2-2: Load. 0 100 10,000 Rise Time vs. Capacitive Propagation Delay (nsec) C LOAD = 1000 pF VDD = 17.5V 40 30 tFALL 20 10 –55 –35 –15 tRISE 85 CLOAD = 1000 pF VIN = 5V tD2 tD1 © 2006 Microchip Technology Inc. 6 105 125 Rise and Fall Times vs. 10,000 Fall Time vs. Capacitive 80 75 70 65 60 55 50 45 40 35 30 25 20 4 5 25 45 65 Temperature (˚C) 1000 CLOAD (pF) FIGURE 2-5: Load. 60 Time (nsec) 10 100 5V 60 FIGURE 2-3: Temperature. 8 FIGURE 2-4: Voltage. 80 50 6 8 10 12 14 16 18 VDD (V) FIGURE 2-6: Supply Voltage. Propagation Delay Time vs. DS21422D-page 5 TC4426/TC4427/TC4428 Note: Unless otherwise indicated, TA = +25ºC with 4.5V ≤ VDD ≤ 18V. 45 CLOAD = 1000 pF 55 VDD = 12V 50 45 tD2 40 35 30 tD1 25 CLOAD = 1000 pF VIN = 5V VDD = 18V tD2 40 Delay Time (nsec) Propagation Delay (nsec) 60 20 35 30 25 20 tD1 15 15 10 10 0 1 2 3 4 5 6 7 8 9 10 11 12 -55 -35 -15 Input Amplitude (V) FIGURE 2-7: Input Amplitude. 5 25 45 65 85 105 125 Temperature (ºC) Propagation Delay Time vs. FIGURE 2-10: Temperature. Propagation Delay Time vs. 4.0 3.5 Both Inputs = 1 IQUIESCENT (mA) IQUIESCENT (mA) V DD = 18V 1 3.0 Both Inputs = 1 2.5 Both Inputs = 0 0.1 4 6 8 FIGURE 2-8: Voltage. 10 12 VDD 14 16 2.0 –55 –35 –15 18 Supply Current vs. Supply FIGURE 2-11: Temperature. 5 65 85 105 125 Supply Current vs. 25 25 20 20 Worst Case @ TJ = +150˚C RDS(ON) (Ω) Worst Case @ TJ = +150˚C RDS(ON) (Ω) 25 45 TA (˚C) 15 Typical @ TA = +25˚C 10 15 Typical @ TA = +25˚C 10 5 5 4 6 8 10 12 14 16 18 4 6 VDD FIGURE 2-9: Supply Voltage. DS21422D-page 6 Output Resistance (ROH) vs. 8 10 12 14 16 18 VDD FIGURE 2-12: Supply Voltage. Output Resistance (ROL) vs. © 2006 Microchip Technology Inc. TC4426/TC4427/TC4428 Note: Unless otherwise indicated, TA = +25ºC with 4.5V ≤ VDD ≤ 18V. 60 60 VDD = 18V 2 MHz VDD = 18V 50 1000 pF 2200 pF 50 ISUPPLY (mA) ISUPPLY (mA) 900 kHz 40 600 kHz 30 20 200 kHz 10 40 100 pF 30 20 10 20 kHz 0 100 1000 CLOAD (pF) FIGURE 2-13: Capacitive Load. 0 10,000 Supply Current vs. 10 FIGURE 2-16: Frequency. 2 MHz VDD = 12V VDD = 12V 50 50 40 40 ISUPPLY (mA) ISUPPLY (mA) Supply Current vs. 60 60 30 900 kHz 20 600 kHz 10 1000 CLOAD (pF) FIGURE 2-14: Capacitive Load. 2200 pF 1000 pF 30 20 100 pF 10 200 kHz 20 kHz 0 100 0 10 10,000 Supply Current vs. 100 1000 FREQUENCY (kHz) FIGURE 2-17: Frequency. 60 Supply Current vs. 60 VDD = 6V VDD = 6V 50 50 40 30 ISUPPLY (mA) ISUPPLY (mA) 100 1000 FREQUENCY (kHz) 2 MHz 20 900 kHz 600 kHz 200 kHz 20 kHz 10 0 100 FIGURE 2-15: Capacitive Load. 1000 CLOAD (pF) 2200 pF 30 1000 pF 20 10 10,000 Supply Current vs. © 2006 Microchip Technology Inc. 40 100 pF 0 10 FIGURE 2-18: Frequency. 100 1000 FREQUENCY (kHz) Supply Current vs. DS21422D-page 7 TC4426/TC4427/TC4428 Note: Unless otherwise indicated, TA = +25ºC with 4.5V ≤ VDD ≤ 18V. –8 10 9 8 7 6 A • sec 5 4 3 2 –9 10 Note: 4 6 8 10 12 VDD 14 16 18 The values on this graph represent the loss seen by both drivers in a package during one complete cycle. For a single driver, divide the stated values by 2. For a single transition of a single driver, divide the stated value by 4. FIGURE 2-19: Supply Voltage. DS21422D-page 8 Crossover Energy vs. © 2006 Microchip Technology Inc. TC4426/TC4427/TC4428 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE (1) 8-Pin PDIP/ MSOP/SOIC 8-Pin DFN 1 1 NC No connection 2 2 IN A Input A 3 3 GND Ground 4 4 IN B Input B 5 5 OUT B 6 6 VDD 7 7 OUT A 8 8 NC No connection PAD NC Exposed Metal Pad — Note 1: 3.1 Symbol Description Output B Supply input Output A Duplicate pins must be connected for proper operation. Inputs A and B MOSFET driver inputs A and B are high-impedance, TTL/CMOS compatible inputs. These inputs also have 300 mV of hysteresis between the high and low thresholds that prevents output glitching even when the rise and fall time of the input signal is very slow. 3.2 Supply Input (VDD) The VDD input is the bias supply for the MOSFET driver and is rated for 4.5V to 18V with respect to the ground pin. The VDD input should be bypassed with local ceramic capacitors. The value of these capacitors should be chosen based on the capacitive load that is being driven. A value of 1.0 μF is suggested. Ground (GND) Ground is the device return pin. The ground pin(s) should have a low-impedance connection to the bias supply source return. High peak currents will flow out the ground pin(s) when the capacitive load is being discharged. 3.3 3.4 3.5 Exposed Metal Pad The exposed metal pad of the 6x5 DFN package is not internally connected to any potential. Therefore, this pad can be connected to a ground plane or other copper plane on a printed circuit board, to aid in heat removal from the package. Output A and B MOSFET driver outputs A and B are low-impedance, CMOS push-pull style outputs. The pull-down and pullup devices are of equal strength, making the rise and fall times equivalent. © 2006 Microchip Technology Inc. DS21422D-page 9 TC4426/TC4427/TC4428 4.0 APPLICATIONS INFORMATION +5V 90% Input VDD = 18V 0V 4.7 μF 0.1 μF Input tD1 7 VDD tR 90% 90% Output 5 10% 10% 0V Inverting Driver CL = 1000 pF 4 tD2 tF Output 6 2 10% +5V 90% Input 3 Input: 100 kHz, square wave, tRISE = tFALL ≤ 10 ns 0V VDD 10% tD1 90% tR Output 0V 10% 90% tD2 tF 10% Non-Inverting Driver FIGURE 4-1: DS21422D-page 10 Switching Time Test Circuit. © 2006 Microchip Technology Inc. TC4426/TC4427/TC4428 5.0 PACKAGING INFORMATION 5.1 Package Marking Information 8-Lead DFN Example: XXXXXXX XXXXXXX XXYYWW NNN TC4426 EMF 0420 256 Example: 8-Lead MSOP 4426C 420256 XXXXX YWWNNN 8-Lead PDIP (300 mil) XXXXXXXX XXXXXNNN YYWW TC4427 CPA256 0420 8-Lead SOIC (150 mil) XXXXXXXX XXXXYYWW NNN Legend: XX...X Y YY WW NNN Note: * Example: Example: TC4428 COA0420 256 Customer specific information* Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line thus limiting the number of available characters for customer specific information. Standard device marking consists of Microchip part number, year code, week code, and traceability code. © 2006 Microchip Technology Inc. DS21422D-page 11 TC4426/TC4427/TC4428 8-Lead Plastic Dual Flat No Lead Package (MF) 6x5 mm Body (DFN-S) – Saw Singulated DS21422D-page 12 © 2006 Microchip Technology Inc. TC4426/TC4427/TC4428 8-Lead Plastic Micro Small Outline Package (MS) (MSOP) E E1 p D 2 B n 1 α c φ L F A2 A A1 β INCHES Units Dimension Limits MILLIMETERS* NOM MIN MIN MAX NOM MAX Number of Pins n Pitch p Overall Height A - - .043 - - 1.10 Molded Package Thickness A2 .030 .033 .037 0.75 0.85 0.95 Standoff A1 .000 - .006 0.00 - 0.15 Overall Width E .193 BSC 4.90 BSC Molded Package Width E1 .118 BSC 3.00 BSC Overall Length D .118 BSC Foot Length L 0.60 0.80 Footprint (Reference) Foot Angle F φ Lead Thickness c .003 .006 .009 0.08 - 0.23 Lead Width B α .009 .012 .016 0.22 - 0.40 Mold Draft Angle Top Mold Draft Angle Bottom β 8 8 .026 BSC .016 0.65 BSC 3.00 BSC .024 .031 0.40 .037 REF 0° 0.95 REF - 8° 0° - 8° 5° - 15° 5° - 15° 5° - 15° 5° - 15° * Controlling Parameter Notes: Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010" (0.254mm) per side. BSC: Basic Dimension. Theoretically exact value shown without tolerances. See ASME Y14.5M REF: Reference Dimension, usually without tolerance, for information purposes only. See ASME Y14.5M JEDEC Equivalent: MO-187 Drawing No. C04-111 © 2006 Microchip Technology Inc. Revised 07-21-05 DS21422D-page 13 TC4426/TC4427/TC4428 8-Lead Plastic Dual In-line (P) – 300 mil (PDIP) E1 D 2 n 1 α E A2 A L c A1 β B1 p eB B Units Dimension Limits n p INCHES* NOM 8 .100 .155 .130 MAX MILLIMETERS NOM 8 2.54 3.56 3.94 2.92 3.30 0.38 7.62 7.94 6.10 6.35 9.14 9.46 3.18 3.30 0.20 0.29 1.14 1.46 0.36 0.46 7.87 9.40 5 10 5 10 MAX Number of Pins Pitch Top to Seating Plane A .140 .170 4.32 Molded Package Thickness A2 .115 .145 3.68 Base to Seating Plane A1 .015 Shoulder to Shoulder Width E .300 .313 .325 8.26 Molded Package Width E1 .240 .250 .260 6.60 Overall Length D .360 .373 .385 9.78 Tip to Seating Plane L .125 .130 .135 3.43 c Lead Thickness .008 .012 .015 0.38 Upper Lead Width B1 .045 .058 .070 1.78 Lower Lead Width B .014 .018 .022 0.56 § eB .310 .370 .430 10.92 Overall Row Spacing α Mold Draft Angle Top 5 10 15 15 β Mold Draft Angle Bottom 5 10 15 15 * Controlling Parameter § Significant Characteristic Notes: Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010” (0.254mm) per side. JEDEC Equivalent: MS-001 Drawing No. C04-018 DS21422D-page 14 MIN MIN © 2006 Microchip Technology Inc. TC4426/TC4427/TC4428 8-Lead Plastic Small Outline (SN) – Narrow, 150 mil (SOIC) E E1 p D 2 B n 1 h α 45° c A2 A φ β L Units Dimension Limits n p INCHES* NOM 8 .050 .061 .056 .007 .237 .154 .193 .015 .025 4 .009 .017 12 12 MAX MILLIMETERS NOM 8 1.27 1.35 1.55 1.32 1.42 0.10 0.18 5.79 6.02 3.71 3.91 4.80 4.90 0.25 0.38 0.48 0.62 0 4 0.20 0.23 0.33 0.42 0 12 0 12 MAX Number of Pins Pitch Overall Height A .053 .069 1.75 Molded Package Thickness A2 .052 .061 1.55 Standoff A1 .004 .010 0.25 § Overall Width E .228 .244 6.20 Molded Package Width E1 .146 .157 3.99 Overall Length D .189 .197 5.00 Chamfer Distance h .010 .020 0.51 Foot Length L .019 .030 0.76 φ Foot Angle 0 8 8 c Lead Thickness .008 .010 0.25 Lead Width B .013 .020 0.51 α Mold Draft Angle Top 0 15 15 β Mold Draft Angle Bottom 0 15 15 * Controlling Parameter § Significant Characteristic Notes: Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010” (0.254mm) per side. JEDEC Equivalent: MS-012 Drawing No. C04-057 © 2006 Microchip Technology Inc. MIN A1 MIN DS21422D-page 15 TC4426/TC4427/TC4428 NOTES: DS21422D-page 16 © 2006 Microchip Technology Inc. TC4426/TC4427/TC4428 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. Device X Temperature Range XX XXX X Package Tape & Reel PB Free Examples: a) TC4426COA: 1.5A Dual Inverting MOSFET driver, 0°C to +70°C SOIC package. Device: TC4426: TC4427: TC4428: 1.5A Dual MOSFET Driver, Inverting 1.5A Dual MOSFET Driver, Non-Inverting 1.5A Dual MOSFET Driver, Complementary b) TC4426EUA: 1.5A Dual Inverting MOSFET driver, -40°C to +85°C. MSOP package. Temperature Range: C E V 0°C to +70°C (PDIP and SOIC only) -40°C to +85°C -40°C to +125°C c) TC4426EMF: 1.5A Dual Inverting MOSFET driver, -40°C to +85°C, DFN package. Package: MF = Dual, Flat, No-Lead (6X5 mm Body), 8-lead MF713 = Dual, Flat, No-Lead (6X5 mm Body), 8-lead (Tape and Reel) OA = Plastic SOIC, (150 mil Body), 8-lead OA713 = Plastic SOIC, (150 mil Body), 8-lead (Tape and Reel) PA = Plastic DIP (300 mil Body), 8-lead UA = Plastic Micro Small Outline (MSOP), 8-lead UA713 = Plastic Micro Small Outline (MSOP), 8-lead (Tape and Reel) a) TC4427CPA: 1.5A Dual Non-Inverting MOSFET driver, 0°C to +70°C PDIP package. b) TC4427EPA: 1.5A Dual Non-Inverting MOSFET driver, -40°C to +85°C PDIP package. a) TC4428COA713:1.5A Dual Complementary = = = MOSFET driver, 0°C to +70°C, SOIC package, Tape and Reel. b) TC4428EMF: 1.5A Dual Complementary, MOSFET driver, -40°C to +85°C DFN package. 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. Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products. © 2006 Microchip Technology Inc. DS21422D-page 17 TC4426/TC4427/TC4428 NOTES: DS21422D-page 18 © 2006 Microchip Technology Inc. Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. • Microchip is willing to work with the customer who is concerned about the integrity of their code. • Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.” Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. 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 Microchip intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART, PRO MATE, PowerSmart, rfPIC, and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB, PICMASTER, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Analog-for-the-Digital Age, Application Maestro, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, Linear Active Thermistor, MPASM, MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, Real ICE, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel, Total Endurance, UNI/O, WiperLock and Zena are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. 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. © 2006, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received ISO/TS-16949:2002 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona and Mountain View, California in October 2003. The Company’s quality system processes and procedures are for its PICmicro® 8-bit MCUs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified. © 2006 Microchip Technology Inc. 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