Obsolete Device Recommended Replacements: TC1270A, TC1270AN, TC1271A TC1270/TC1271 4-Pin Reset Monitors Features: General Description • Precision VCC Monitor for 1.8V, 2.7V, 3.0V, 3.3V and 5.0V Nominal Supplies • Manual Reset Input • 140 ms Minimum RESET, Reset Output Duration • RESET Output Valid to VCC = 1.0V (TC1270) • Low 7 µA Supply Current • VCC Transient Immunity • Small 4-Pin SOT-143 Package • No External Components • Replacement for MAX811/812 and Offers a Lower Threshold Voltage Option The TC1270 and TC1271 are cost-effective system supervisor circuits designed to monitor VCC in digital systems and provide a reset signal to the host processor when necessary. A manual reset input is provided to override the reset monitor, and is suitable for use as a push button reset. No external components are required. Applications: • • • • Computers Embedded Systems Battery Powered Equipment Critical µP Power Supply Monitoring The reset output is driven active within 20 µs (4 µs for F version) of VCC falling through the reset voltage threshold. Reset is maintained active for a minimum of 140 ms after VCC rises above the reset threshold. The TC1271 has an active-high RESET output while the TC1270 has an active-low RESET output. The output of the TC1270 is valid down to VCC = 1V. Both devices are available in a 4-Pin SOT-143 package. The TC1270/TC1271 devices are optimized to reject fast transient glitches on the VCC line. Low supply current of 7 µA (VCC = 3.3V) makes these devices suitable for battery powered applications. Package Type Typical Operating Circuit VCC VCC VCC Processor Push Button MR RESET TC1270 GND © 2007 Microchip Technology Inc. GND 1 Reset Input (Active Low) GND 4 VCC 3 MR TC1270 TC1271 TC1270 RESET TC1271 (RESET) 2 DS21381D-page 1 TC1270/TC1271 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 Operating Temperature Range.............-40°C to +85°C Storage Temperature Range ..............-65°C to +150°C ELECTRICAL SPECIFICATIONS Electrical Characteristics: VCC = 5V for L/M versions, VCC = 3.3V for T/S versions, VCC = 3V for R version, VCC = 2.0V for F version. Unless otherwise noted, TA = -40°C to +85°C. Typical values are at TA = +25°C. (Note 1). Symbol Parameter Min Typ Max Units Test Conditions VCC VCC Range 1.2 — 5.5 V ICC Supply Current — 7 15 µA VCC > VTH, for L/M/R/S/T/F — 10 15 µA VCC < VTH, for L/M/R/S/T — 6 12 µA VCC < VTH, for F 4.54 4.50 4.63 — 4.72 4.75 V V TC127_L; TA = +25°C TA = -40°C to +85°C 4.30 4.25 4.38 — 4.46 4.50 V V TC127_M; TA = +25°C TA = -40°C to +85°C 3.03 3.00 3.08 — 3.14 3.15 V V TC127_T; TA = +25°C TA = -40°C to +85°C 2.88 2.85 2.93 — 2.98 3.00 V V TC127_S; TA = +25°C TA = -40°C to +85°C 2.58 2.55 2.63 — 2.68 2.70 V V TC127_R; TA = +25°C TA = -40°C to +85°C 1.71 1.70 1.75 — 1.79 1.80 V V TC127_F; TA = +25°C TA = -40°C to +85°C Reset Threshold Tempco — 30 — ppm/°C VCC to Reset Delay — — 20 5 — — µs VCC = VTH to VTH – 125 mV; L/M/R/S/T/F Reset Active Time-out Period 140 280 560 ms VCC = VTH(MAX) MR Minimum Pulse Width 10 — — µs MR Glitch Immunity — 0.1 — µs tMD MR to Reset Propagation Delay — 0.5 — µs VIH MR Input Threshold 2.3 — — V VCC > VTH(MAX), TC127_L/M VTH tRP tMR Reset Threshold VIL MR Pull-up Resistance VOH Note 1: 2: Reset Output Voltage High (TC1271) 0.7 VCC — — V VCC > VTH(MAX), TC127_R/S/T/F — — 0.8 V VCC > VTH(MAX), TC127_L/M — — 0.15 VCC V VCC > VTH(MAX), TC127_R/S/T/F 10 20 40 kΩ 0.8 VCC — — V ISOURCE = 150 µA; VCC ≤ VTH(MIN) Production testing done at TA = +25°C, over temperature limits ensured by design. RESET output for TC1270, Reset output for TC1271. DS21381D-page 2 © 2007 Microchip Technology Inc. TC1270/TC1271 ELECTRICAL SPECIFICATIONS (CONTINUED) Electrical Characteristics: VCC = 5V for L/M versions, VCC = 3.3V for T/S versions, VCC = 3V for R version, VCC = 2.0V for F version. Unless otherwise noted, TA = -40°C to +85°C. Typical values are at TA = +25°C. (Note 1). Symbol VOL VOL VOH Note 1: 2: Parameter Reset Output Voltage Low (TC1271) RESET Output Voltage Low (TC1270) RESET Output Voltage High (TC1270) Min Typ Max Units Test Conditions — — 0.2 V TC1271F only, ISINK = 500 µA, VCC = VTH(MAX) — — 0.3 V TC1271R/S/T only, ISINK = 1.2 mA, VCC = VTH(MAX) — — 0.4 V TC1271L/M only, ISINK = 3.2 mA, VCC = VTH(MAX) — — 0.3 V TC1270R/S/T only, ISINK = 1.2 mA, VCC = VTH(MIN) TC1270F only: ISINK = 500 µA, VCC = VTH(MIN) — — — — 0.4 TBD V V TC1270L/M only, ISINK = 3.2 mA, VCC = VTH(MIN) ISINK = 50 µA, VCC > 1.0V VCC – 1.5 — — V TC1270L/M only, ISOURCE = 800 µA, VCC = VTH(MAX) 0.8 VCC — — V TC1270R/S/T/F only, ISOURCE = 500 µA, VCC = VTH(MAX) Production testing done at TA = +25°C, over temperature limits ensured by design. RESET output for TC1270, Reset output for TC1271. © 2007 Microchip Technology Inc. DS21381D-page 3 TC1270/TC1271 2.0 TYPICAL CHARACTERISTICS 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. Supply Current vs.Temperature (No Load, TC127xR/S/T/F) Supply Current vs.Temperature (No Load, TC127xL/M) 14 8 SUPPLY CURRENT (μA) SUPPLY CURRENT (μA) 12 10 VCC = 5V 8 VCC = 3V 6 4 VCC = 1V 6 VCC = 5V 4 VCC = 3V VCC = 1V 2 2 -20 0 20 40 60 0 -40 85 60 Power-Down Reset Delay vs. Temperature (TC127xL/M/R/S/T) 30 VOD = 20mV 20 10 VOD = 100mV VOD = 200 mV -20 0 20 40 60 85 50 L/M VOD = 20 mV VOD = 100 mV 40 VOD = 200 mV 30 R/S/T 20 VOD = 200 mV VOD = 100 mV VOD = 20 mV 10 0 -40 85 -20 TEMPERATURE (°C) 0 20 40 60 85 TEMPERATURE (°C) Normalized Reset Threshold vs. Temperature Power-Up Reset Time-out vs. Temperature 1.0030 250 NORMALIZED THRESHOLD (V) POWER-UP RESET TIMEOUT (msec) 40 Power-Down Reset Delay vs. Temperature (TC127xF) 40 245 TC127xL/M 240 TC127xR/S/T/F 235 230 225 -40 20 TEMPERATURE (°C) 50 0 -40 0 -20 TEMPERATURE (°C) POWER-DOWN RESET DELAY (μsec) POWER-DOWN RESET DELAY (μsec) 0 -40 1.0020 1.0010 1.0000 0.9990 0.9980 0.9970 0.9960 0.9950 0.9940 -20 0 20 40 TEMPERATURE (°C) DS21381D-page 4 60 85 -40 -15 35 10 TEMPERATURE (°C) 60 65 © 2007 Microchip Technology Inc. TC1270/TC1271 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: Pin No. 3.1 PIN FUNCTION TABLE Symbol Description 1 GND 2 RESET (TC1270) Ground RESET output remains low while VCC is below the Reset voltage threshold, and for at least 140 ms min. after VCC rises above Reset threshold 2 RESET (TC1271) Reset output remains high while VCC is below the Reset voltage threshold, and for at least 140 ms min. after VCC rises above Reset threshold 3 MR Manual Reset input generates a Reset when MR is below VIL 4 VCC Supply voltage Ground Terminal (GND) GND provides the negative reference for the analog input voltage. Typically, the circuit ground is used. 3.2 Reset Output (RESET) (TC1270) RESET output remains low while VCC is below the Reset voltage threshold (VTRIP). Once the device voltage (VCC) returns to a high level (VTRIP + VHYS), the device will remain in Reset for the Reset delay timer (TRST). After that time expires, the RESET pin will be driven to the high state. 3.3 Reset Output (RESET) (TC1271) 3.4 Manual Reset (MR) The Manual Reset (MR) input pin allows a push button switch to easily be connected to the system. When the push button is depressed, it forces a system Reset. This pin has circuitry that filters noise that may be present on the MR signal. The MR pin is active-low and has an internal pull-up resistor. 3.5 Supply Voltage (VCC) VCC can be used for power supply monitoring or a voltage level that requires monitoring. RESET output remains high while VCC is below the Reset voltage threshold (VTRIP). Once the device voltage (VCC) returns to a high level (VTRIP + VHYS), the device will remain in Reset for the Reset delay timer (TRST). After that time expires, the RESET pin will be driven to the low state. © 2007 Microchip Technology Inc. DS21381D-page 5 TC1270/TC1271 4.0 APPLICATIONS INFORMATION 4.1 VCC Transient Rejection The TC1270/TC1271 provides accurate VCC monitoring and Reset timing during power-up, power-down, and brownout/sag conditions, and rejects negative-going transients (glitches) on the power supply line. Figure 4-3 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 brown-out or power-down. Transient immunity can be improved by adding a capacitor in close proximity to the VCC pin of the TC1270/TC1271. be connected from RESET to ground to discharge stray capacitances and hold the output low (Figure 4-2). 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 TC1271 to ensure a valid high RESET for VCC below 1.1V. VCC VCC TC1270 RESET VCC R1 100k GND VTH MAXIMUM TRANSIENT DURATION (msec) Overdrive FIGURE 4-2: VCC = 0V. Ensuring RESET Valid to Duration 400 4.3 TA = +25°C 320 240 160 TC127LMJ 80 TC127xR/S/T 0 1 10 1000 100 RESET COMPARATOR OVERDRIVE, VTH - VCC (mV) FIGURE 4-1: Maximum Transient Duration vs. Overdrive for Glitch Rejection at +25°C. Processors With Bidirectional I/O Pins Some microprocessors (such as Motorola’s 68HC11) have bidirectional Reset pins. Depending on the current drive capability of the processor pin, an indeterminate logic level may result if there is a logic conflict. This can be avoided by adding a 4.7 kΩ resistor in series with the output of the TC1270/TC1271 (Figure 4-3). If there are other components in the system which require a Reset signal, they should be buffered so as not to load the Reset line. If the other components are required to follow the Reset I/O of the microprocessor, the buffer should be connected as shown with the solid line. Buffer VCC VCC VCC 4.2 Reset Signal Integrity During Power-Down TC1270 RESET The TC1270 RESET output is valid to VCC = 1.0V. Below this voltage the output becomes an “open circuit” and does not sink current. This means CMOS logic inputs to the microprocessor 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 DS21381D-page 6 Buffered RESET To Other System Components GND FIGURE 4-3: Reset I/O. μP 4.7k RESET GND Interfacing to Bidirectional © 2007 Microchip Technology Inc. TC1270/TC1271 5.0 PACKAGING INFORMATION 5.1 Package Marking Information 1 2 3 4 1 1 & 2 = part number code + threshold voltage (two-digit code) 5.2 Part Number (V) TC1270 Code TC1270LERCTR 4.63 S1 TC1270MERCTR 4.38 S2 TC1270TERCTR 3.08 S3 TC1270SERCTR 2.93 S4 TC1270RERCTR 2.63 S5 TC1270FERCTR 1.75 S7 Part Number (V) TC1271 Code TC1271LERCTR 4.63 T1 TC1271MERCTR 4.38 T2 TC1271TERCTR 3.08 T3 TC1271SERCTR 2.9 T4 TC1271RERCTR 2.63 T5 TC1271FERCTR 1.75 T7 3 represents year and quarter code 4 represents production lot ID code Taping Form User Direction of Feed Device Marking Pin 1 Pin 1 W, Width of Carrier Tape P, Pitch Standard Reel Component Orientation Reverse Reel Component Orientation for TR Suffix Device (Mark Right Side Up) Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 4-Pin SOT-143 8 mm 4 mm 3000 7 in. © 2007 Microchip Technology Inc. DS21381D-page 7 TC1270/TC1271 4-Lead Plastic Small Outline Transistor (RC) [SOT-143] Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging D e e/2 N E E1 1 2 e1 A2 A c φ A1 b2 Units Dimension Limits Number of Pins L L1 3X b MILLIMETERS MIN N NOM MAX 4 Pitch e 1.92 BSC Pin1 Offset e1 0.20 BSC Overall Height A 0.80 – Molded Package Thickness A2 0.75 0.90 1.22 1.07 Standoff § A1 0.01 – 0.15 Overall Width E 2.10 – 2.64 Molded Package Width E1 1.20 1.30 1.40 Overall Length D 2.67 2.90 3.05 Foot Length L 0.13 0.50 0.60 Footprint L1 Foot Angle φ 0° – 8° Lead Thickness c 0.08 – 0.20 Lead 1 Width b1 0.76 – 0.94 Leads 2, 3 & 4 Width b 0.30 – 0.54 REF 0.54 Notes: 1. § Significant Characteristic. 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. REF: Reference Dimension, usually without tolerance, for information purposes only. Microchip Technology Drawing C04-031B DS21381D-page 8 © 2007 Microchip Technology Inc. TC1270/TC1271 APPENDIX A: REVISION HISTORY Revision D (February 2007) • Section 5.0 “Packaging Information”: Corrected SOT-143 Packaging Information. • Section 3.0 “Pin Descriptions”: Added pin descriptions. • Added disclaimer on package outline drawing. • Updated package outline drawing. • Section 1.0 “Electrical Characteristics”: Refomatted table. Revision C (June 2006) • Enhanced SOT-143 Packaging Information. Revision B (May 2002) • Undocumented changes. Revision A (March 2002) • Original Release of this Document. © 2007 Microchip Technology Inc. DS21381D-page 9 TC1270/TC1271 NOTES: DS21381D-page 10 © 2007 Microchip Technology Inc. TC1270/TC1271 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 X Threshold Temperature Voltage Range Device TC1270: 4-Pin RESET Monitor TC1271: 4-Pin RESET Monitor Threshold voltage (typical) L M T S R F = = = = = = Temperature Range E = -40°C to +85°C Package RCTR = XX Package 4.63 4.38 3.08 2.93 2.63 1.75 Examples: a) b) c) d) e) f) g) TC1270LERCTR: TC1270MERCTR: TC1270TERCTR: TC1270SERCPBTR: TC1270SERCTR: TC1270RERCTR: TC1270FERCTR: 4.63V 4.38V 3.08V 2.93V 2.93V 2.63V 1.75V a) b) c) d) e) f) TC1271LERCTR: TC1271MERCTR: TC1271TERCTR: TC1271SERCTR: TC1271RERCTR: TC1271FERCTR: 4.63V 4.38V 3.08V 2.93V 2.63V 1.75V Plastic small outline transistor (RC) SOT-143, 4 lead, (tape and reel). © 2007 Microchip Technology Inc. DS21381D-page 11 TC1270/TC1271 NOTES: DS21381D-page 12 © 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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