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Obsolete Device
TC1278/TC1279
3-Pin Reset Monitors for 5V Systems
Features
* * * * * * * * Precision VCC Monitor for 5.0V System Supplies 250 ms Minimum RESET Output Duration Output Valid to VCC = 1.2V VCC Transient Immunity Small 3-Pin SOT-23 Package No External Components Internal Pull-up Resistor Available in 3 different voltage detection levels: - 4.625V (typ.), -5 suffix - 4.375V (typ.), -10 suffix - 4.125V (typ.), -15 suffix
General Description
The TC1278/TC1279 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. The open-drain output uses an internal pull-up resistor of approximately 6 k. The reset output is driven active within 5 s of VCC falling through the reset voltage threshold. RESET is maintained active for a minimum of 250 ms after VCC rises above the reset threshold. The TC1278 has an active-high RESET output, while the TC1279 has an active-low RESET output, with both devices having an open-drain output stage. The output is valid down to VCC = 1.2V. Both devices are available in a 3-Pin SOT- 23 package.
Applications
* * * * Computers Embedded Systems Battery Powered Equipment Critical P Power Supply Monitoring
Package Type
3-Pin SOT-23
(TC1278) RESET 1 (TC1279) RESET
Typical Operating Circuit
VCC Internal Pull-up 6 k Resistor - +
TC1278 TC1279
RESET VCC 2
3
GND
VREF
TC1279
GND TC1278 has an active-high RESET output.
(c) 2007 Microchip Technology Inc.
DS21384D-page 1
TC1278/TC1279
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......................................20 mA Power Dissipation (TA 70C) 3-Pin SOT-23 (derate 4mW/C above +70C) ................................................................230 mW Operating Temperature Range.............-40C to +85C Storage Temperature Range ..............-65C to +150C
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, TA = -40C to +85C. Typical values are at TA = +25C. Parameters Supply Voltage Low Level @ RESET (TC1278) RESET (TC1279) Output Current @ 0.4 Volts Operating Current: TC1278 TC1279 Operating Current: TC1278 TC1279 VCC Trip Point (TC1278/9-5) VCC Trip Point (TC1278/9-10) VCC Trip Point (TC1278/9-15) Output Capacitance Internal Pull-Up Resistor Note 1: 2: 3: 4: VCCTP-5 VCCTP-10 VCCTP-15 COUT RP ICC2 -- -- 4.50 4.25 4.00 -- 3 -- 0.9 4.625 4.375 4.125 9 6 40 2.0 4.74 4.49 4.24 -- 9 A mA V V V pF k VCC < VCCTP(MIN), RESET = 0, (Note 4) VCC < VCCTP(MIN), RESET = 0, (Note 3) Note 1 Note 1 Note 1 ICC1 -- -- 0.9 -- 2.0 40 mA A VCC > VCCTP(MAX), RESET = 1, (Note 3) VCC > VCCTP(MAX), RESET = 1, Note 4 Sym VCC VOL IOL Min 1.2 -- +8 Typ -- -- -- Max 5.5 0.4 -- Units V V mA Note 1 Note 1 Note 2 Conditions
All voltages referenced to ground. A 1 k external resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using the TC1279. VCC = 1.8V. Operating current is specified with the open-drain output in the active ("ON") condition. Operating current is specified with the open-drain output in the non-active ("OFF") condition.
DS21384D-page 2
(c) 2007 Microchip Technology Inc.
TC1278/TC1279
AC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, TA = -40C to +85C. Typical values are at TA = +25C. Parameters RESET Active Time VCC Detect to RESET (TC1279) VCC Detect to RESET (TC1278) VCC Slew Rate (4.75V-4.00V) VCC Slew Rate (4.00V-4.75V) VCC Detect to RESET (TC1279) VCC Detect to RESET (TC1278) Sym tRST tRPD1 tRPD2 tF tR tRPU1 tRPU2 Min 250 -- -- 300 0 250 250 Typ 350 2 2 -- -- 350 350 Max 450 5 5 -- -- 450 450 Units ms s s s ns ms ms Figure 3-2 Figure 3-4 Figure 3-2, Figure 3-4 Figure 3-1, Figure 3-3 Figure 3-1 Figure 3-3 Conditions
(c) 2007 Microchip Technology Inc.
DS21384D-page 3
TC1278/TC1279
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No. 1 1 2 3
PIN FUNCTION TABLE
Symbol RESET (TC1279) RESET (TC1278) VCC GND RESET output RESET output Supply voltage (1.2V to 5.5V). Ground. Function
2.1
RESET (TC1279)
2.3
VCC
RESET output remains low while VCC is below the reset voltage threshold, and for 350 ms (250 ms min.) after VCC rises above reset threshold. The output stage of the TC1279 is open-drain.
Supply voltage (1.2V to 5.5V).
2.4
Ground
Device ground.
2.2
RESET (TC1278)
RESET output remains high while VCC is below the reset voltage threshold, and for 350 ms (250 ms min.) after VCC rises above reset threshold. The output stage of the TC1278 is open-drain.
DS21384D-page 4
(c) 2007 Microchip Technology Inc.
TC1278/TC1279
3.0
3.1
APPLICATIONS INFORMATION
Operation - Power Monitor
tR VCCTP(MAX) VCCTP
The TC1278/TC1279 provide the function of detecting out-of-tolerance power supply conditions and warning a processor-based system of impending power failure. When VCC is detected as out-of-tolerance, the RESET signal is asserted. On power-up, RESET is kept active for approximately 350 ms after the power supply has reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RESET is released. tR 4.00V VCC tRPU1 RESET VOH 4.75V VCCTP
VCCTP(MIN) VCC
tRPU2
RESET
VOL
FIGURE 3-3: Diagram.
TC1278 Power-Up Timing
VCC 4.74V VCCTP
tF
4.00V
FIGURE 3-1: Diagram.
TC1279 Power Up Timing
tRPD2
VCC 4.75V VCCTP
tF RESET 4.00V
VOH
RESET SLEWS WITH VCC
FIGURE 3-4: Timing Diagram.
TC1278 Power-Down
RESET
tRPD1
VOL
FIGURE 3-2: Timing Diagram.
TC1279 Power-Down
(c) 2007 Microchip Technology Inc.
DS21384D-page 5
TC1278/TC1279
3.2 VCC Transient Rejection
VCC VCCTP Overdrive The TC1278/TC1279 provides accurate VCC monitoring and reset timing during power-up, power-down, and brownout/sag conditions. Furthermore, it rejects negative-going transients (glitches) on the power supply line. Figure 3-5 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. Transient immunity can be improved by adding a capacitor in close proximity to the VCC pin of the TC1278/TC1279.
MAXIMUM TRANSIENT DURATION (sec)
Duration 5 4 3 2 1 0 1 5 1000 100 RESET COMPARATOR OVERDRIVE, [ VCCTP - VCC] (mV) TA = +25C
TC1278/9
FIGURE 3-5: Maximum Transient Duration vs. Overdrive For Glitch Rejection At +25C.
DS21384D-page 6
(c) 2007 Microchip Technology Inc.
TC1278/TC1279
4.0
4.1
PACKAGING INFORMATION
Package Marking Information
3-Pin SOT-23
1
2
3
4
1
&
2
= part number code + temperature range and voltage Part Number Code PA PB PC RA RB RC
TC1278-5ENB TC1278-10ENB TC1278-15ENB TC1279-5ENB TC1279-10ENB TC1279-15ENB
3
represents year and 2-month code represents production lot ID code
4
(c) 2007 Microchip Technology Inc.
DS21384D-page 7
TC1278/TC1279
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 e e1 D
2
A
c A2
A1
Units Dimension Limits Number of Pins Lead Pitch Outside Lead Pitch Overall Height Molded Package Thickness Standoff Overall Width Molded Package Width Overall Length Foot Length Foot Angle Lead Thickness N e e1 A A2 A1 E E1 D L c 0.89 0.79 0.01 2.10 1.16 2.67 0.13 0 0.08 MIN MILLIMETERS NOM 3 0.95 BSC 1.90 BSC - 0.95 - - 1.30 2.90 0.50 - -
L
MAX
1.12 1.02 0.10 2.64 1.40 3.05 0.60 10 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
DS21384D-page 8
(c) 2007 Microchip Technology Inc.
TC1278/TC1279
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 -XX Reset VCC Threshold X Temperature Range XX Package Examples:
a) b) c) a) b) c)
TC1278-5ENBTR: 4.625 Reset TC1278-10ENBTR: 4.375 Reset TC1278-15ENBTR: 4.125 Reset TC1279-5ENBTR: 4.625 Reset TC1279-10ENBTR: 4.375 Reset TC1279-15ENBTR: 4.125 Reset
Device
TC1278: TC1279: 5 10 15
3-Pin Reset Monitor for 5V Systems 3-Pin Reset Monitor for 5V Systems
Reset VCC Threshold:
= 4.625V = 4.375V = 4.125V
Temperature Range Package
E = -40C to +85C NBTR = Plastic Small Outline Transistor, (SOT23), 3-lead (Tape and Reel)
(c) 2007 Microchip Technology Inc.
DS21384D-page 9
TC1278/TC1279
NOTES:
DS21384D-page 10
(c) 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. (c) 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(R) MCUs and dsPIC(R) DSCs, KEELOQ(R) 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.
(c) 2007 Microchip Technology Inc.
DS21384D-page 11
WORLDWIDE SALES AND SERVICE
AMERICAS
Corporate Office 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: http://support.microchip.com Web Address: www.microchip.com Atlanta Duluth, GA Tel: 678-957-9614 Fax: 678-957-1455 Boston Westborough, MA Tel: 774-760-0087 Fax: 774-760-0088 Chicago Itasca, IL Tel: 630-285-0071 Fax: 630-285-0075 Dallas Addison, TX Tel: 972-818-7423 Fax: 972-818-2924 Detroit Farmington Hills, MI Tel: 248-538-2250 Fax: 248-538-2260 Kokomo Kokomo, IN Tel: 765-864-8360 Fax: 765-864-8387 Los Angeles Mission Viejo, CA Tel: 949-462-9523 Fax: 949-462-9608 Santa Clara Santa Clara, CA Tel: 408-961-6444 Fax: 408-961-6445 Toronto Mississauga, Ontario, Canada Tel: 905-673-0699 Fax: 905-673-6509
ASIA/PACIFIC
Asia Pacific Office Suites 3707-14, 37th Floor Tower 6, The Gateway Habour City, Kowloon Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431 Australia - Sydney Tel: 61-2-9868-6733 Fax: 61-2-9868-6755 China - Beijing Tel: 86-10-8528-2100 Fax: 86-10-8528-2104 China - Chengdu Tel: 86-28-8665-5511 Fax: 86-28-8665-7889 China - Fuzhou Tel: 86-591-8750-3506 Fax: 86-591-8750-3521 China - Hong Kong SAR Tel: 852-2401-1200 Fax: 852-2401-3431 China - Qingdao Tel: 86-532-8502-7355 Fax: 86-532-8502-7205 China - Shanghai Tel: 86-21-5407-5533 Fax: 86-21-5407-5066 China - Shenyang Tel: 86-24-2334-2829 Fax: 86-24-2334-2393 China - Shenzhen Tel: 86-755-8203-2660 Fax: 86-755-8203-1760 China - Shunde Tel: 86-757-2839-5507 Fax: 86-757-2839-5571 China - Wuhan Tel: 86-27-5980-5300 Fax: 86-27-5980-5118 China - Xian Tel: 86-29-8833-7250 Fax: 86-29-8833-7256
ASIA/PACIFIC
India - Bangalore Tel: 91-80-4182-8400 Fax: 91-80-4182-8422 India - New Delhi Tel: 91-11-4160-8631 Fax: 91-11-4160-8632 India - Pune Tel: 91-20-2566-1512 Fax: 91-20-2566-1513 Japan - Yokohama Tel: 81-45-471- 6166 Fax: 81-45-471-6122 Korea - Gumi Tel: 82-54-473-4301 Fax: 82-54-473-4302 Korea - Seoul Tel: 82-2-554-7200 Fax: 82-2-558-5932 or 82-2-558-5934 Malaysia - Penang Tel: 60-4-646-8870 Fax: 60-4-646-5086 Philippines - Manila Tel: 63-2-634-9065 Fax: 63-2-634-9069 Singapore Tel: 65-6334-8870 Fax: 65-6334-8850 Taiwan - Hsin Chu Tel: 886-3-572-9526 Fax: 886-3-572-6459 Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350
EUROPE
Austria - Wels Tel: 43-7242-2244-39 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79 Germany - Munich Tel: 49-89-627-144-0 Fax: 49-89-627-144-44 Italy - Milan Tel: 39-0331-742611 Fax: 39-0331-466781 Netherlands - Drunen Tel: 31-416-690399 Fax: 31-416-690340 Spain - Madrid Tel: 34-91-708-08-90 Fax: 34-91-708-08-91 UK - Wokingham Tel: 44-118-921-5869 Fax: 44-118-921-5820
12/08/06
DS21384D-page 12
(c) 2007 Microchip Technology Inc.

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