Obsolete Device TC1272/TC1273/TC1274 3-Pin Reset Monitors for 5V Systems Features General Description • Precision V Monitor for 5.0V Systems The TC1272/TC1273/TC1274 are cost-effective CC • 100ms Minimum RESET, RESET Output system supervisor circuits designed to monitor VCC in Duration digital systems and provide a reset signal to the host processor when necessary. No external components • Output Valid to V = 1.2V CC are required. • V Transient Immunity CC The reset output is driven active within 20µs of V • Small 3-Pin SOT-23 Package CC falling through the reset voltage threshold. RESET is • No External Components maintained active for a minimum of 100ms after V CC rises above the reset threshold. The TC1274 has an Applications active-high RESET output, while the TC1272 and • Computers TC1273 have an active-low RESET output. The • Embedded Systems TC1272 and TC1274 each have a complimentary out- put, while the TC1273 has an open-drain output. The • Battery-Powered Equipment output of the TC1272 and TC1273 is valid down to V CC • Critical µP Power Supply Monitoring = 1.2V. The TC1274 is valid down to V = 1.8V. All CC three devices are available in a 3-Pin SOT-23 Package Type package. 3-Pin SOT-23 The TC1272/TC1273/TC1274 devices are optimized to reject fast transient glitches on the V line. CC Typical Application Circuit RESET 1 **(RESET) V TC1272 CC TC1273 3 GND 2 TC1274 VCC VCC VCC 2 RESET 1 RInEpuStET TC1272 Processor **( ) is for TC1274 GND GND 3 © 2007 Microchip Technology Inc. DS21382C-page 1

TC1272/TC1273/TC1274 1.0 ELECTRICAL † Stresses above those listed under "Absolute Maximum Rat- ings" may cause permanent damage to the device. These are CHARACTERISTICS stress ratings only and functional operation of the device at these or any other conditions above those indicated in the Absolute Maximum Ratings† operation sections of the specifications is not implied. Expo- sure to Absolute Maximum Rating conditions for extended Supply Voltage (V to GND).............................+6.0V CC periods may affect device reliability. RESET, RESET..........................-0.3V to (V + 0.3V) CC Input Current, V ..............................................20mA CC Output Current, RESET, RESET........................20mA Power Dissipation (T ≤ 70°C) A 3-Pin SOT-23 (derate 4mW/°C above +70°C) ................................................................230mW Operating Temperature Range.............-40°C to +85°C Storage Temperature Range..............-65°C to +150°C DC CHARACTERISTICS Electrical Specifications: Unless otherwise noted, T = -40°C to +85°C. Typical values are at T = +25°C. A A Parameters Sym Min Typ Max Units Conditions Supply Voltage TC1272, TC1273 V 1.2 — 5.5 V Note1 CC TC1274 V 1.8 — 5.5 V CC Output Voltage @ 0-500µA V V – 0.5V V – 0.1V — V TC1272, TC1274 (Note1) OH CC CC Output Current @ 2.4 Volts V = 5V TC1272 I — 10 — mA Note2 CC OH V = 4V TC1274 I — 8 — mA CC OH Output Current @ 0.4 Volts I +10 30 — mA Note2, Note5 OL Operating Current V < 5.5V: TC1272, TC1274 I — 17 40 µA Note3 CC CC V < V < 5.5V: TC1273 I — 17 40 µA Note3 CCTP CC CC V < V : TC1273 I — 700 1200 µA Note3 CC CCTP CC V Trip Point (TC1272/3/4-5) V 4.50 4.62 4.75 V Note1 CC CCTP-5 V Trip Point (TC1272/3/4-10) V 4.25 4.37 4.49 V Note1 CC CCTP-10 V Trip Point (TC1272/3/4-15) V 4.00 4.12 4.24 V Note1 CC CCTP-15 Output Capacitance C — 9 — pF OUT Internal Pull-Up Resistor R 3 6 9 kΩ P AC Electrical Characteristics: T = -40°C to +85°C unless otherwise noted. Typical values are at T = +25°C. A A RESET Active Time t 100 200 300 ms RST V Detect to RESET t — 20 50 µs V = 1V, Figure4-2 CC RPD1 CC(LOW) TC1272, TC1273 V Detect to RESET - TC1274 t — 20 50 µs V = 1V, Figure4-4 CC RPD2 CC(LOW) V Slew Rate t 300 — — µs Figure4-2, Figure4-4 CC F (V (MAX) to V (MIN)) CCTP CCTP V Slew Rate t 0 — — ns Figure4-1, Figure4-3 CC R (V (MIN) to V (MAX)) CCTP CCTP V Detect to RESET t 100 200 300 ms Note4, Figure4-1 CC RPU1 TC1272, TC1273 V Detect to RESET - TC1274 t 100 200 300 ms Note4, Figure4-3 CC RPU2 Note 1: All voltages referenced to ground. 2: Measured with V ≥ 2.7 volts. CC 3: Measured with RESET output open for TC1272/TC1273; measured with RESET output open for TC1274. 4: t = 5µs. R 5: A 1kΩ external resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using the TC1273. DS21382C-page 2 © 2007 Microchip Technology Inc.

TC1272/TC1273/TC1274 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, T = -40°C to +85°C. Typical values are at T = +25°C. A A Comparator Overdrive voltage (V ) is defined in Figure4-5 OD sec)100000 TA = 25°C ec) 300 TA = 25°C μLAY ( VOD =V O20Dm =V 100mV μAY (s 200 E 10000 L SET D VOD =V 2O0D0 =m 1VV ET DE RE 1000 VOD = 2V ES TO O R 100 CC 100 T C V C V 10 0 1 10 100 1000 10000 100000 0 1 2 3 4 5 VCC SLEW RATE (V/μ sec) COMPARATOR OVERDRIVE (V) FIGURE 2-1: V Detect to Reset FIGURE 2-2: Reset Delays vs. CC (RESET). Comparator Overdrive. © 2007 Microchip Technology Inc. DS21382C-page 3

TC1272/TC1273/TC1274 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table3-1. TABLE 3-1: PIN FUNCTION TABLES Pin No. Symbol Function 1 RESET RESET Output (TC1272 and TC1273) 1 RESET RESET Output (TC1274) 2 V Supply voltage (1.2V to 5.5V TC1272 and TC1273; 1.8V to 5.5V TC1274) CC 3 GND Ground 3.1 RESET Output (RESET) 3.2 RESET Output (RESET) The RESET output remains low while V is below the The RESET output remains high while V is below the CC CC reset voltage threshold, and for 200ms (100ms reset voltage threshold, and for 200ms (100ms minimum) after V rises above reset threshold. The minimum) after V rises above reset threshold. The CC CC output stage of the TC1272 is complimentary, while the output stage of the TC1274 is complimentary. output stage of the TC1273 is open-drain. DS21382C-page 4 © 2007 Microchip Technology Inc.

TC1272/TC1273/TC1274 4.0 APPLICATIONS INFORMATION 4.1 Operation – Power Monitor tR The TC1272/TC1273/TC1274 is designed to function as a voltage monitor for +5V systems. These devices VCCTP(MAX) provide a RESET signal to indicate that the VCC has VCCTP(MIN) VCCTP dropped below a preset voltage level that is selected by the suffix part number. In addition, the RESET is held active for approximately 200ms after the power supply VCC has risen above the voltage threshold level to allow tRPU2 time for the power supply to stabilize before system operation commences. RESET VOL tR FIGURE 4-3: Timing Diagram – Power Up VCCTP(MIN) VCVCCTCPTP(MAX) (TC1274). VCC tF tRPU1 VCC VCCTP(MAX) VOH VCCTP VCCTP(MIN) RESET FIGURE 4-1: Timing Diagram – Power Up tRPD2 (TC1272/TC1273). VCC tF RESET VOH RESET Slews With VCC VCCTP(MAX) VCCTP FIGURE 4-4: Timing Diagram – VCCTP(MIN) Power Down (TC1274). tRPD1 RESET VOL FIGURE 4-2: Timing Diagram – Power Down (TC1272/TC1273). © 2007 Microchip Technology Inc. DS21382C-page 5

TC1272/TC1273/TC1274 4.2 V Transient Rejection CC V CC The TC1272/TC1273/TC1274 provides accurate V CC monitoring and reset timing during power-up, power- down and brownout/sag conditions, and rejects VTH negative-going transients (glitches) on the power Overdrive supply line. Figure4-5 shows the maximum transient duration vs. maximum negative excursion (overdrive) for glitch rejection. Any combination of duration and overdrive that lays under the curve will not generate a Duration reset signal. Combinations above the curve are dTeratencstieedn t aims mau nbirtoyw cnaonu t boer ipmopwroevr-eddo wbny caodnddinitgio na. µsec) 500 TA = +25°C capacitor in close proximity to the V pin of the N ( CC O 400 TC1272/TC1273/TC1274. TI A R 4.3 RESET Signal Integrity During U D 300 Power-Down T N E The TC1272 RESET output is valid to V = 1.2V. SI 200 CC N Below this voltage the output becomes an "open A R circuit" and does not sink current. This means CMOS T M 100 TC1272/3/4 logic inputs to the μP will be floating at an undeter- U M mined voltage. Most digital systems are completely XI shut down well above this voltage. However, in situa- A 0 M tions where RESET must be maintained valid to 1 10 100 1000 VCC = 0V, a pull-down resistor must be connected from RESET COMPARATOR OVERDRIVE, RESET to ground to discharge stray capacitances and [V -V ] (mV) CCTP CC hold the output low (Figure4-6). This resistor value, though not critical, should be chosen such that it does FIGURE 4-5: Maximum Transient not appreciably load RESET under normal operation Duration vs. Overdrive For Glitch Rejection At (100kΩ will be suitable for most applications). Simi- +25°C. larly, a pull-up resistor to V is required for the CC TC1274 to ensure a valid high RESET for V below CC V 1.8V. CC V CC TC1272 RESET R 1 GND 100kΩ FIGURE 4-6: Ensuring Reset Valid To V =0V. cc DS21382C-page 6 © 2007 Microchip Technology Inc.

TC1272/TC1273/TC1274 5.0 PACKAGING INFORMATION 5.1 Package Marking Information 3-Pin SOT-23 3 1 2 3 4 1 2 1 &2 represents part number code + temperature range and voltage Reset V TC1272 TC1273 TC1274 CC Threshold (V) Code Code Code 4.62 X1 Y1 Z1 4.37 X2 Y2 Z2 4.12 X3 Y3 Z3 3 represents year and quarter code 4 represents lot ID number © 2007 Microchip Technology Inc. DS21382C-page 7

TC1272/TC1273/TC1274 3-Lead Plastic Small Outline Transistor (TT or NB) [SOT-23] Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging b N E E1 1 2 e e1 D c A A2 φ A1 L Units MILLIMETERS Dimension Limits MIN NOM MAX Number of Pins N 3 Lead Pitch e 0.95 BSC Outside Lead Pitch e1 1.90 BSC Overall Height A 0.89 – 1.12 Molded Package Thickness A2 0.79 0.95 1.02 Standoff A1 0.01 – 0.10 Overall Width E 2.10 – 2.64 Molded Package Width E1 1.16 1.30 1.40 Overall Length D 2.67 2.90 3.05 Foot Length L 0.13 0.50 0.60 Foot Angle φ 0° – 10° Lead Thickness c 0.08 – 0.20 Lead Width b 0.30 – 0.54 Notes: 1. Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.25 mm per side. 2. Dimensioning and tolerancing per ASME Y14.5M. BSC: Basic Dimension. Theoretically exact value shown without tolerances. MicrochipTechnologyDrawingC04-104B DS21382C-page 8 © 2007 Microchip Technology Inc.

TC1272/TC1273/TC1274 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. XX X /XX Examples: Device Reset VCC Temperature Package a) TC1272-10ENBTR: 4.37V Reset Threshold Range b) TC1272-15ENBTR: 4.12V Reset c) TC1272-5ENBTR: 4.62V Reset Device: TC1272: 3-Pin Reset Monitor - Complementary TC1273: 3-Pin Reset Monitor - Open-Drain a) TC1273-10ENBTR: 4.37V Reset TC1274: 3-Pin Reset Monitor - Complementary b) TC1273-15ENBTR: 4.12V Reset c) TC1273-5ENBTR: 4.62V Reset Reset VCC 5 = 4.62V Threshold Voltage 10 = 4.37V 15 = 4.12V a) TC1274-10ENBTR: 4.37V Reset b) TC1274-15ENBTR: 4.12V Reset Temperature Range: E = -40°C to +85°C c) TC1274-5ENBTR: 4.62V Reset Package: NB = Plastic Small Outline Transistor (SOT-23), 3-lead © 2007 Microchip Technology Inc. DS21382C-page9

TC1272/TC1273/TC1274 NOTES: DS21382C-page 10 © 2007 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 Trademarks applications and the like is provided only for your convenience The Microchip name and logo, the Microchip logo, Accuron, and may be superseded by updates. It is your responsibility to dsPIC, KEELOQ, KEELOQ logo, microID, MPLAB, PIC, ensure that your application meets with your specifications. PICmicro, PICSTART, PROMATE, PowerSmart, rfPIC, and MICROCHIP MAKES NO REPRESENTATIONS OR SmartShunt are registered trademarks of Microchip WARRANTIES OF ANY KIND WHETHER EXPRESS OR Technology Incorporated in the U.S.A. and other countries. IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, AmpLab, FilterLab, Linear Active Thermistor, Migratable INCLUDING BUT NOT LIMITED TO ITS CONDITION, Memory, MXDEV, MXLAB, PS logo, SEEVAL, SmartSensor QUALITY, PERFORMANCE, MERCHANTABILITY OR and The Embedded Control Solutions Company are FITNESS FOR PURPOSE. Microchip disclaims all liability registered trademarks of Microchip Technology Incorporated arising from this information and its use. Use of Microchip in the U.S.A. devices in life support and/or safety applications is entirely at Analog-for-the-Digital Age, Application Maestro, CodeGuard, the buyer’s risk, and the buyer agrees to defend, indemnify and dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, hold harmless Microchip from any and all damages, claims, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, suits, or expenses resulting from such use. No licenses are In-Circuit Serial Programming, ICSP, ICEPIC, Mindi, MiWi, conveyed, implicitly or otherwise, under any Microchip MPASM, MPLAB Certified logo, MPLIB, MPLINK, PICkit, intellectual property rights. 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. © 2007, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona, Gresham, Oregon and Mountain View, California. The Company’s quality system processes and procedures are for its PIC® MCUs and dsPIC® DSCs, 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. © 2007 Microchip Technology Inc. DS21382C-page 11

WORLDWIDE SALES AND SERVICE AMERICAS ASIA/PACIFIC ASIA/PACIFIC EUROPE Corporate Office Asia Pacific Office India - Bangalore Austria - Wels 2355 West Chandler Blvd. Suites 3707-14, 37th Floor Tel: 91-80-4182-8400 Tel: 43-7242-2244-39 Chandler, AZ 85224-6199 Tower 6, The Gateway Fax: 91-80-4182-8422 Fax: 43-7242-2244-393 Tel: 480-792-7200 Habour City, Kowloon India - New Delhi Denmark - Copenhagen Fax: 480-792-7277 Hong Kong Tel: 91-11-4160-8631 Tel: 45-4450-2828 Technical Support: Tel: 852-2401-1200 Fax: 91-11-4160-8632 Fax: 45-4485-2829 http://support.microchip.com Web Address: Fax: 852-2401-3431 India - Pune France - Paris www.microchip.com Australia - Sydney Tel: 91-20-2566-1512 Tel: 33-1-69-53-63-20 Tel: 61-2-9868-6733 Fax: 33-1-69-30-90-79 Fax: 91-20-2566-1513 Atlanta Fax: 61-2-9868-6755 Germany - Munich Duluth, GA Japan - Yokohama China - Beijing Tel: 49-89-627-144-0 Tel: 678-957-9614 Tel: 81-45-471- 6166 Tel: 86-10-8528-2100 Fax: 49-89-627-144-44 Fax: 678-957-1455 Fax: 81-45-471-6122 Fax: 86-10-8528-2104 Italy - Milan Boston Korea - Gumi Westborough, MA China - Chengdu Tel: 82-54-473-4301 Tel: 39-0331-742611 Tel: 774-760-0087 Tel: 86-28-8665-5511 Fax: 82-54-473-4302 Fax: 39-0331-466781 Fax: 774-760-0088 Fax: 86-28-8665-7889 Korea - Seoul Netherlands - Drunen Chicago China - Fuzhou Tel: 82-2-554-7200 Tel: 31-416-690399 Itasca, IL Tel: 86-591-8750-3506 Fax: 82-2-558-5932 or Fax: 31-416-690340 Tel: 630-285-0071 Fax: 86-591-8750-3521 82-2-558-5934 Spain - Madrid Fax: 630-285-0075 China - Hong Kong SAR Malaysia - Penang Tel: 34-91-708-08-90 Dallas Tel: 852-2401-1200 Tel: 60-4-646-8870 Fax: 34-91-708-08-91 Addison, TX Fax: 852-2401-3431 Fax: 60-4-646-5086 UK - Wokingham Tel: 972-818-7423 China - Qingdao Philippines - Manila Tel: 44-118-921-5869 Fax: 972-818-2924 Tel: 86-532-8502-7355 Tel: 63-2-634-9065 Fax: 44-118-921-5820 Detroit Fax: 86-532-8502-7205 Fax: 63-2-634-9069 Farmington Hills, MI China - Shanghai Singapore Tel: 248-538-2250 Tel: 86-21-5407-5533 Tel: 65-6334-8870 Fax: 248-538-2260 Fax: 86-21-5407-5066 Fax: 65-6334-8850 Kokomo China - Shenyang Taiwan - Hsin Chu Kokomo, IN Tel: 86-24-2334-2829 Tel: 886-3-572-9526 Tel: 765-864-8360 Fax: 86-24-2334-2393 Fax: 886-3-572-6459 Fax: 765-864-8387 China - Shenzhen Taiwan - Kaohsiung Los Angeles Tel: 86-755-8203-2660 Tel: 886-7-536-4818 Mission Viejo, CA Fax: 86-755-8203-1760 Fax: 886-7-536-4803 Tel: 949-462-9523 China - Shunde Taiwan - Taipei Fax: 949-462-9608 Tel: 86-757-2839-5507 Tel: 886-2-2500-6610 Santa Clara Fax: 86-757-2839-5571 Fax: 886-2-2508-0102 Santa Clara, CA China - Wuhan Thailand - Bangkok Tel: 408-961-6444 Tel: 86-27-5980-5300 Tel: 66-2-694-1351 Fax: 408-961-6445 Fax: 86-27-5980-5118 Fax: 66-2-694-1350 Toronto China - Xian Mississauga, Ontario, Tel: 86-29-8833-7250 Canada Fax: 86-29-8833-7256 Tel: 905-673-0699 Fax: 905-673-6509 12/08/06 DS21382C-page 12 © 2007 Microchip Technology Inc.