Obsolete Device TC1272/TC1273/TC1274 3-Pin Reset Monitors for 5V Systems Features General Description • Precision VCC Monitor for 5.0V Systems • 100 ms Minimum RESET, RESET Output Duration • Output Valid to VCC = 1.2V • VCC Transient Immunity • Small 3-Pin SOT-23 Package • No External Components The TC1272/TC1273/TC1274 are cost-effective system supervisor circuits designed to monitor VCC in digital systems and provide a reset signal to the host processor when necessary. No external components are required. Applications • • • • Computers Embedded Systems Battery-Powered Equipment Critical µP Power Supply Monitoring Package Type 3-Pin SOT-23 RESET **(RESET) The TC1272/TC1273/TC1274 devices are optimized to reject fast transient glitches on the VCC line. Typical Application Circuit 1 TC1272 TC1273 TC1274 VCC The reset output is driven active within 20 µs of VCC falling through the reset voltage threshold. RESET is maintained active for a minimum of 100 ms after VCC rises above the reset threshold. The TC1274 has an active-high RESET output, while the TC1272 and TC1273 have an active-low RESET output. The TC1272 and TC1274 each have a complimentary output, while the TC1273 has an open-drain output. The output of the TC1272 and TC1273 is valid down to VCC = 1.2V. The TC1274 is valid down to VCC = 1.8V. All three devices are available in a 3-Pin SOT-23 package. 2 **( ) is for TC1274 VCC 3 GND 2 VCC RESET VCC 1 RESET Input TC1272 Processor GND GND 3 © 2007 Microchip Technology Inc. DS21382C-page 1 TC1272/TC1273/TC1274 1.0 ELECTRICAL CHARACTERISTICS † 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. Absolute Maximum Ratings† Supply Voltage (VCC to GND) .............................+6.0V RESET, RESET.......................... -0.3V to (VCC + 0.3V) Input Current, VCC ..............................................20 mA Output Current, RESET, RESET ........................20 mA Power Dissipation (TA ≤ 70°C) 3-Pin SOT-23 (derate 4 mW/°C above +70°C) ................................................................230 mW Operating Temperature Range.............-40°C to +85°C Storage Temperature Range ..............-65°C to +150°C DC CHARACTERISTICS Electrical Specifications: Unless otherwise noted, TA = -40°C to +85°C. Typical values are at TA = +25°C. Parameters Sym Min Typ Max Units TC1272, TC1273 VCC 1.2 — 5.5 V TC1274 VCC 1.8 — 5.5 V — V Conditions Supply Voltage Output Voltage @ 0-500 µA VOH VCC – 0.5V VCC – 0.1V Note 1 TC1272, TC1274 (Note 1) Output Current @ 2.4 Volts VCC = 5V TC1272 IOH — 10 — mA VCC = 4V TC1274 IOH — 8 — mA IOL +10 30 — mA Note 2, Note 5 VCC < 5.5V: TC1272, TC1274 ICC — 17 40 µA Note 3 VCCTP < VCC < 5.5V: TC1273 ICC — 17 40 µA Note 3 VCC < VCCTP: TC1273 ICC — 700 1200 µA Note 3 VCCTP-5 4.50 4.62 4.75 V Note 1 VCC Trip Point (TC1272/3/4-10) VCCTP-10 4.25 4.37 4.49 V Note 1 VCC Trip Point (TC1272/3/4-15) VCCTP-15 4.00 4.12 4.24 V Note 1 COUT — 9 — pF RP 3 6 9 kΩ Output Current @ 0.4 Volts Note 2 Operating Current VCC Trip Point (TC1272/3/4-5) Output Capacitance Internal Pull-Up Resistor AC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C. RESET Active Time tRST 100 200 300 ms VCC Detect to RESET TC1272, TC1273 tRPD1 — 20 50 µs VCC(LOW) = 1V, Figure 4-2 VCC Detect to RESET - TC1274 tRPD2 — 20 50 µs VCC(LOW) = 1V, Figure 4-4 VCC Slew Rate (VCCTP(MAX) to VCCTP(MIN)) tF 300 — — µs Figure 4-2, Figure 4-4 VCC Slew Rate (VCCTP(MIN) to VCCTP(MAX)) tR 0 — — ns Figure 4-1, Figure 4-3 VCC Detect to RESET TC1272, TC1273 tRPU1 100 200 300 ms Note 4, Figure 4-1 VCC Detect to RESET - TC1274 tRPU2 100 200 300 ms Note 4, Figure 4-3 Note 1: 2: 3: 4: 5: All voltages referenced to ground. Measured with VCC ≥ 2.7 volts. Measured with RESET output open for TC1272/TC1273; measured with RESET output open for TC1274. tR = 5 µs. A 1 kΩ 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. 300 TA = 25°C 100000 VOD = 20mV VOD = 100mV 10000 VOD = 200mV VOD = 1V 1000 VOD = 2V 100 10 1 10 TA = 25°C 200 100 0 100 1000 10000 100000 VCC SLEW RATE (V/μsec) FIGURE 2-1: (RESET). VCC TO RESET DELAY (μsec) VCC TO RESET DELAY (μsec) Note: Unless otherwise indicated, TA = -40°C to +85°C. Typical values are at TA = +25°C. Comparator Overdrive voltage (VOD) is defined in Figure 4-5 VCC Detect to Reset © 2007 Microchip Technology Inc. 0 1 2 3 4 5 COMPARATOR OVERDRIVE (V) FIGURE 2-2: Reset Delays vs. Comparator Overdrive. DS21382C-page 3 TC1272/TC1273/TC1274 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: 3.1 PIN FUNCTION TABLES Pin No. Symbol Function 1 RESET RESET Output (TC1272 and TC1273) 1 RESET RESET Output (TC1274) 2 VCC Supply voltage (1.2V to 5.5V TC1272 and TC1273; 1.8V to 5.5V TC1274) 3 GND Ground RESET Output (RESET) The RESET output remains low while VCC is below the reset voltage threshold, and for 200 ms (100 ms minimum) after VCC rises above reset threshold. The output stage of the TC1272 is complimentary, while the output stage of the TC1273 is open-drain. DS21382C-page 4 3.2 RESET Output (RESET) The RESET output remains high while VCC is below the reset voltage threshold, and for 200 ms (100 ms minimum) after VCC rises above reset threshold. The output stage of the TC1274 is complimentary. © 2007 Microchip Technology Inc. TC1272/TC1273/TC1274 4.0 APPLICATIONS INFORMATION 4.1 Operation – Power Monitor The TC1272/TC1273/TC1274 is designed to function as a voltage monitor for +5V systems. These devices provide a RESET signal to indicate that the VCC has dropped below a preset voltage level that is selected by the suffix part number. In addition, the RESET is held active for approximately 200 ms after the power supply has risen above the voltage threshold level to allow time for the power supply to stabilize before system operation commences. VCCTP(MAX) VCCTP VCCTP(MIN) VCC tRPU2 VOL RESET tR VCCTP(MIN) tR VCCTP(MAX) VCCTP FIGURE 4-3: (TC1274). Timing Diagram – Power Up VCC tF tRPU1 VCC VOH VCCTP(MAX) VCCTP VCCTP(MIN) RESET FIGURE 4-1: Timing Diagram – Power Up (TC1272/TC1273). tRPD2 VOH tF VCC RESET VCCTP(MAX) VCCTP VCCTP(MIN) RESET Slews With VCC FIGURE 4-4: Timing Diagram – 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 VCC Transient Rejection The TC1272/TC1273/TC1274 provides accurate VCC monitoring and reset timing during power-up, powerdown and brownout/sag conditions, and rejects negative-going transients (glitches) on the power supply line. Figure 4-5 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 reset signal. Combinations above the curve are detected as a brownout or power-down condition. Transient immunity can be improved by adding a capacitor in close proximity to the VCC pin of the TC1272/TC1273/TC1274. 4.3 RESET Signal Integrity During Power-Down The TC1272 RESET output is valid to VCC = 1.2V. Below this voltage the output becomes an "open circuit" and does not sink current. This means CMOS logic inputs to the μP will be floating at an undetermined voltage. Most digital systems are completely shut down well above this voltage. However, in situations where RESET must be maintained valid to VCC = 0V, a pull-down resistor must be connected from RESET to ground to discharge stray capacitances and hold the output low (Figure 4-6). This resistor value, though not critical, should be chosen such that it does not appreciably load RESET under normal operation (100 kΩ will be suitable for most applications). Similarly, a pull-up resistor to VCC is required for the TC1274 to ensure a valid high RESET for VCC below 1.8V. VCC VTH Overdrive Duration MAXIMUM TRANSIENT DURATION (µsec) 4.2 500 TA = +25°C 400 300 200 TC1272/3/4 100 0 1 10 1000 100 RESET COMPARATOR OVERDRIVE, [VCCTP-VCC] (mV) FIGURE 4-5: Maximum Transient Duration vs. Overdrive For Glitch Rejection At +25°C. VCC VCC TC1272 RESET R1 GND FIGURE 4-6: Vcc = 0V. DS21382C-page 6 100 kΩ Ensuring Reset Valid To © 2007 Microchip Technology Inc. TC1272/TC1273/TC1274 5.0 PACKAGING INFORMATION 5.1 Package Marking Information 3-Pin SOT-23 3 1 2 3 1 1 & 2 4 2 represents part number code + temperature range and voltage Reset VCC Threshold (V) TC1272 Code TC1273 Code TC1274 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 2 1 e e1 D c A φ A2 A1 L Units Dimension Limits Number of Pins MILLIMETERS MIN NOM MAX N 3 Lead Pitch e 0.95 BSC Outside Lead Pitch e1 Overall Height A 0.89 – Molded Package Thickness A2 0.79 0.95 1.02 Standoff A1 0.01 – 0.10 1.90 BSC 1.12 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. Microchip Technology Drawing C04-104B 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 Device Reset VCC Threshold Temperature Range Package Device: Reset VCC Threshold Voltage TC1272: TC1273: TC1274: 5 10 15 3-Pin Reset Monitor - Complementary 3-Pin Reset Monitor - Open-Drain 3-Pin Reset Monitor - Complementary = 4.62V = 4.37V = 4.12V Temperature Range: E = -40°C to +85°C Package: NB = Plastic Small Outline Transistor (SOT-23), 3-lead © 2007 Microchip Technology Inc. Examples: a) TC1272-10ENBTR: 4.37V Reset b) TC1272-15ENBTR: 4.12V Reset c) TC1272-5ENBTR: a) TC1273-10ENBTR: 4.37V Reset b) TC1273-15ENBTR: 4.12V Reset c) TC1273-5ENBTR: a) TC1274-10ENBTR: 4.37V Reset b) TC1274-15ENBTR: 4.12V Reset c) TC1274-5ENBTR: 4.62V Reset 4.62V Reset 4.62V Reset 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 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 devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. 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, KEELOQ logo, 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, Linear Active Thermistor, Migratable Memory, MXDEV, MXLAB, PS logo, 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, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB, MPLINK, 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. © 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. 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