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TC1270/TC1271
4-Pin Reset Monitors
Features:
* 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 A 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
General Description
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. The reset output is driven active within 20 s (4 s 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 A (VCC = 3.3V) makes these devices suitable for battery powered applications.
Applications:
* * * * Computers Embedded Systems Battery Powered Equipment Critical P Power Supply Monitoring
Typical Operating Circuit
VCC VCC VCC Processor Push Button MR RESET Reset Input (Active Low) GND
Package Type
GND 1 TC1270 TC1271 TC1270 RESET TC1271 (RESET) 2
4
VCC
TC1270
GND
3
MR
(c) 2007 Microchip Technology Inc.
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.............-40C to +85C Storage Temperature Range ..............-65C to +150C
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 = -40C to +85C. Typical values are at TA = +25C. (Note 1). Symbol VCC ICC VCC Range Supply Current Parameter Min 1.2 -- -- -- VTH Reset Threshold 4.54 4.50 4.30 4.25 3.03 3.00 2.88 2.85 2.58 2.55 1.71 1.70 Reset Threshold Tempco VCC to Reset Delay tRP tMR tMD VIH VIL MR Pull-up Resistance VOH Note 1: 2: Reset Output Voltage High (TC1271) Reset Active Time-out Period MR Minimum Pulse Width MR Glitch Immunity MR to Reset Propagation Delay MR Input Threshold -- -- -- 140 10 -- -- 2.3 0.7 VCC -- -- 10 0.8 VCC Typ -- 7 10 6 4.63 -- 4.38 -- 3.08 -- 2.93 -- 2.63 -- 1.75 -- 30 20 5 280 -- 0.1 0.5 -- -- -- -- 20 -- Max 5.5 15 15 12 4.72 4.75 4.46 4.50 3.14 3.15 2.98 3.00 2.68 2.70 1.79 1.80 -- -- -- 560 -- -- -- -- -- 0.8 0.15 VCC 40 -- Units V A A A V V V V V V V V V V V V ppm/C s ms s s s V V VCC > VTH(MAX), TC127_L/M VCC > VTH(MAX), TC127_R/S/T/F VCC > VTH(MAX), TC127_L/M VCC > VTH(MAX), TC127_R/S/T/F ISOURCE = 150 A; VCC VTH(MIN) VCC = VTH to VTH - 125 mV; L/M/R/S/T/F VCC = VTH(MAX) VCC > VTH, for L/M/R/S/T/F VCC < VTH, for L/M/R/S/T VCC < VTH, for F TC127_L; TA = +25C TA = -40C to +85C TC127_M; TA = +25C TA = -40C to +85C TC127_T; TA = +25C TA = -40C to +85C TC127_S; TA = +25C TA = -40C to +85C TC127_R; TA = +25C TA = -40C to +85C TC127_F; TA = +25C TA = -40C to +85C Test Conditions
V V
k V
Production testing done at TA = +25C, over temperature limits ensured by design. RESET output for TC1270, Reset output for TC1271.
DS21381D-page 2
(c) 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 = -40C to +85C. Typical values are at TA = +25C. (Note 1). Symbol VOL Parameter Reset Output Voltage Low (TC1271) Min -- Typ -- Max 0.2 Units V Test Conditions TC1271F only, ISINK = 500 A, VCC = VTH(MAX) TC1271R/S/T only, ISINK = 1.2 mA, VCC = VTH(MAX) TC1271L/M only, ISINK = 3.2 mA, VCC = VTH(MAX) TC1270R/S/T only, ISINK = 1.2 mA, VCC = VTH(MIN) TC1270F only: ISINK = 500 A, VCC = VTH(MIN) TC1270L/M only, ISINK = 3.2 mA, VCC = VTH(MIN) ISINK = 50 A, VCC > 1.0V TC1270L/M only, ISOURCE = 800 A, VCC = VTH(MAX) TC1270R/S/T/F only, ISOURCE = 500 A, VCC = VTH(MAX)
-- -- VOL RESET Output Voltage Low (TC1270) --
-- -- --
0.3 0.4 0.3
V V V
-- -- VOH RESET Output Voltage High (TC1270) VCC - 1.5
-- -- --
0.4 TBD --
V V V
0.8 VCC
--
--
V
Note 1: 2:
Production testing done at TA = +25C, over temperature limits ensured by design. RESET output for TC1270, Reset output for TC1271.
(c) 2007 Microchip Technology Inc.
DS21381D-page 3
TC1270/TC1271
2.0
Note:
TYPICAL CHARACTERISTICS
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)
14 12
Supply Current vs.Temperature (No Load, TC127xL/M)
8
SUPPLY CURRENT (A)
SUPPLY CURRENT (A)
10 8 6 4 VCC = 1V 2 0 -40 VCC = 5V VCC = 3V
6 VCC = 5V 4
VCC = 3V VCC = 1V
2
-20
0
20
40
60
85
0 -40
-20
0
20
40
60
85
TEMPERATURE (C)
TEMPERATURE (C)
Power-Down Reset Delay vs. Temperature (TC127xF)
POWER-DOWN RESET DELAY (sec)
Power-Down Reset Delay vs. Temperature (TC127xL/M/R/S/T)
50 L/M VOD = 20 mV VOD = 100 mV VOD = 200 mV
POWER-DOWN RESET DELAY (sec)
50 40 30 VOD = 20mV 20
40
30 R/S/T 20 10 VOD = 200 mV VOD = 100 mV VOD = 20 mV
10 VOD = 100mV 0 -40 VOD = 200 mV -20 0 20 40 60 85 TEMPERATURE (C)
0 -40
-20
0
20
40
60
85
TEMPERATURE (C)
Power-Up Reset Time-out vs. Temperature
POWER-UP RESET TIMEOUT (msec)
250
NORMALIZED THRESHOLD (V)
Normalized Reset Threshold vs. Temperature
1.0030 1.0020 1.0010 1.0000 0.9990 0.9980 0.9970 0.9960 0.9950 0.9940
245 TC127xL/M
240
235
TC127xR/S/T/F
230
225 -40
-20
0
20
40
60
85
-40
-15
TEMPERATURE (C)
35 10 TEMPERATURE (C)
60
65
DS21381D-page 4
(c) 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. 1 2 2 3 4
PIN FUNCTION TABLE
Symbol GND RESET
(TC1270)
Description 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 Reset output remains high while VCC is below the Reset voltage threshold, and for at least 140 ms min. after VCC rises aboev Reset threshold Manual Reset input generates a Reset when MR is below VIL Supply voltage
RESET (TC1271) MR VCC
3.1
Ground Terminal (GND)
3.4
Manual Reset (MR)
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.
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)
3.3
Reset Output (RESET) (TC1271)
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.
(c) 2007 Microchip Technology Inc.
DS21381D-page 5
TC1270/TC1271
4.0
4.1
APPLICATIONS INFORMATION
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.
VCC VTH Overdrive
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 k 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 R1 100k
GND
MAXIMUM TRANSIENT DURATION (msec)
FIGURE 4-2: VCC = 0V.
Duration 400 TA = +25C
Ensuring RESET Valid to
4.3
Processors With Bidirectional I/O Pins
320
240 160 TC127LMJ 80 0 1 TC127xR/S/T 10 1000 100 RESET COMPARATOR OVERDRIVE, VTH - VCC (mV)
Some microprocessor's (such as Motorola 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 k 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.
Buffered RESET To Other System Components
FIGURE 4-1: Maximum Transient Duration vs. Overdrive for Glitch Rejection at +25C.
Buffer
VCC VCC VCC P 4.7k RESET
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
GND
GND
FIGURE 4-3: Reset I/O.
Interfacing to Bidirectional
DS21381D-page 6
(c) 2007 Microchip Technology Inc.
TC1270/TC1271
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
Part Number TC1270LERCTR TC1270MERCTR TC1270TERCTR
1 2 3 4
(V) 4.63 4.38 3.08 2.93 2.63 1.75 (V) 4.63 4.38 3.08 2.9 2.63 1.75
TC1270 Code S1 S2 S3 S4 S5 S7 TC1271 Code T1 T2 T3 T4 T5 T7
TC1270SERCTR TC1270RERCTR TC1270FERCTR Part Number
1
1
&
2
= part number code + threshold voltage (two-digit code)
TC1271LERCTR TC1271MERCTR TC1271TERCTR TC1271SERCTR TC1271RERCTR TC1271FERCTR
3 4
represents year and quarter code represents production lot ID code
5.2
Taping Form
Device Marking
User Direction of Feed
Pin 1
W, Width of Carrier Tape
Pin 1 Standard Reel Component Orientation
P, Pitch Reverse Reel Component Orientation
for TR Suffix Device (Mark Right Side Up) Package 4-Pin SOT-143 Carrier Width (W) 8 mm Pitch (P) 4 mm Part Per Full Reel 3000 Reel Size 7 in.
(c) 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 e1
2
A
A2
c
A1
b2
3X b
L1
L
Units Dimension Limits Number of Pins Pitch Pin1 Offset Overall Height Molded Package Thickness Standoff Overall Width Molded Package Width Overall Length Foot Length Footprint Foot Angle Lead Thickness Lead 1 Width Leads 2, 3 & 4 Width N e e1 A A2 A1 E E1 D L L1 c b1 b 0 0.08 0.76 0.30 0.80 0.75 0.01 2.10 1.20 2.67 0.13 MIN
MILLIMETERS NOM 4 1.92 BSC 0.20 BSC - 0.90 - - 1.30 2.90 0.50 0.54 REF - - - - 8 0.20 0.94 1.22 1.07 0.15 2.64 1.40 3.05 0.60 MAX
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
(c) 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.
(c) 2007 Microchip Technology Inc.
DS21381D-page 9
TC1270/TC1271
NOTES:
DS21381D-page 10
(c) 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 XX Package Examples:
a) b) c) d) e) f) g) a) b) c) d) e) f) TC1270LERCTR: TC1270MERCTR: TC1270TERCTR: TC1270SERCPBTR: TC1270SERCTR: TC1270RERCTR: TC1270FERCTR: TC1271LERCTR: TC1271MERCTR: TC1271TERCTR: TC1271SERCTR: TC1271RERCTR: TC1271FERCTR: 4.63V 4.38V 3.08V 2.93V 2.93V 2.63V 1.75V 4.63V 4.38V 3.08V 2.93V 2.63V 1.75V
Threshold Temperature Voltage Range
Device
TC1270: 4-Pin RESET Monitor TC1271: 4-Pin RESET Monitor L M T S R F E = = = = = = 4.63 4.38 3.08 2.93 2.63 1.75
Threshold voltage (typical)
Temperature Range Package
= -40C to +85C Plastic small outline transistor (RC) SOT-143, 4 lead, (tape and reel).
RCTR =
(c) 2007 Microchip Technology Inc.
DS21381D-page 11
TC1270/TC1271
NOTES:
DS21381D-page 12
(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.
DS21381D-page 13
WORLDWIDE SALES AND SERVICE
AMERICAS
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ASIA/PACIFIC
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ASIA/PACIFIC
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EUROPE
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12/08/06
DS21381D-page 14
(c) 2007 Microchip Technology Inc.

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