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M
Features
TC1272/TC1273/TC1274
General Description
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. The reset output is driven active within 20 sec of VCC falling through the reset voltage threshold. RESET is maintained active for a minimum of 100 msec 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-23B package. The TC1272/TC1273/TC1274 devices are optimized to reject fast transient glitches on the VCC line.
3-Pin Reset Monitors for 5V Systems
* Precision VCC Monitor for 5.0V Systems * 100 msec Minimum RESET, RESET Output Duration * Output Valid to VCC = 1.2V * VCC Transient Immunity * Small 3-Pin SOT-23B Package * No External Components
Applications
* * * * Computers Embedded Systems Battery-Powered Equipment Critical P Power Supply Monitoring
Package Type
3-Pin SOT-23B*
RESET **(RESET) 1
Typical Operating Circuit
TC1272 TC1273 TC1274
VCC 3 GND 2 VCC RESET 1 VCC RESET Input
VCC
2
TC1272
* 3-Pin SOT-23B is equivalent to JEDEC TO-236 **( ) is for TC1274 GND
3
Processor
GND
2003 Microchip Technology Inc.
DS21382B-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 70C) 3-Pin SOT-23B (derate 4 mW/C above +70C) ................................................................230 mW Operating Temperature Range............. -40C to +85C Storage Temperature Range .............. -65C to +150C
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, TA = -40C to +85C. Typical values are at TA = +25C. Parameters Supply Voltage TC1272, TC1273 TC1274 Output Voltage @ 0-500 A Output Current @ 2.4 Volts VCC = 5V TC1272 VCC = 4V TC1274 Output Current @ 0.4 Volts Operating Current VCC < 5.5V: TC1272, TC1274 VCCTP < VCC < 5.5V: TC1273 VCC < VCCTP: TC1273 V CC Trip Point (TC1272/3/4-5) ICC ICC ICC V CCTP-5 -- -- -- 4.50 4.25 4.00 -- 3 100 -- -- 300 0 100 100 17 17 700 4.62 4.37 4.12 9 6 200 20 20 -- -- 200 200 40 40 1200 4.75 4.49 4.24 -- 9 300 50 50 -- -- 300 300 A A A V V V pF k msec sec sec sec nsec msec msec VCC(LOW) = 1V, Figure 4-2 VCC(LOW) = 1V, Figure 4-4 Figure 4-2, Figure 4-4 Figure 4-1, Figure 4-3 Note 4, Figure 4-1 Note 4, Figure 4-3 Note 3 Note 3 Note 3 Note 1 Note 1 Note 1 IOH IOH IOL -- -- +10 10 8 30 -- -- -- mA mA mA Note 2, Note 5 Note 2 V CC V CC VOH 1.2 1.8 -- -- 5.5 5.5 -- V V V TC1272, TC1274 (Note 1) Note 1 Sym Min Typ Max Units Conditions
VCC - 0.5V VCC - 0.1V
VCC Trip Point (TC1272/3/4-10) VCCTP-10 VCC Trip Point (TC1272/3/4-15) VCCTP-15 Output Capacitance Internal Pull-Up Resistor RESET Active Time VCC Detect to RESET TC1272, TC1273 VCC Detect to RESET - TC1274 VCC Slew Rate (VCCTP(MAX) to VCCTP(MIN)) VCC Slew Rate (VCCTP(MIN) to VCCTP(MAX)) VCC Detect to RESET TC1272, TC1273 VCC Detect to RESET - TC1274 Note 1: 2: 3: 4: 5: COUT RP tRST tRPD1 tRPD2 tF tR tRPU1 tRPU2
AC Electrical Characteristics: TA = -40C to +85C unless otherwise noted. Typical values are at TA = +25C.
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 sec. A 1 k external resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using the TC1273.
DS21382B-page 2
2003 Microchip Technology Inc.
TC1272/TC1273/TC1274
2.0
Note:
TYPICAL PERFORMANCE CURVES
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, TA = -40C to +85C. Typical values are at TA = +25C. Comparator Overdrive voltage (VOD) is defined in Figure 4-5
TA = 25C 100000 VOD = 20mV VOD = 100mV 10000 VOD = 200mV VOD = 1V 1000 VOD = 2V
300 TA = 25C
VCC TO RESET DELAY (sec)
VCC TO RESET DELAY (sec)
200
100
100
10
1
10
0
100
1000
10000
100000
0
1
2
3
4
5
VCC SLEW RATE (V/sec)
COMPARATOR OVERDRIVE (V)
FIGURE 2-1: (RESET).
VCC Detect to Reset
FIGURE 2-2: Reset Delays vs. Comparator Overdrive.
2003 Microchip Technology Inc.
DS21382B-page 3
TC1272/TC1273/TC1274
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
Pin No. 1 1 2 3
PIN FUNCTION TABLES
Symbol RESET RESET VCC GND Function RESET Output (TC1272 and TC1273) RESET Output (TC1274) Supply voltage (1.2V to 5.5V TC1272 and TC1273; 1.8V to 5.5V TC1274) Ground
3.1
RESET Output (RESET)
3.2
RESET Output (RESET)
The RESET output remains low while VCC is below the reset voltage threshold, and for 200 msec (100 msec min.) after VCC rises above reset threshold. The output stage of the TC1272 is complimentary, while the output stage of the TC1273 is open-drain.
The RESET output remains high while VCC is below the reset voltage threshold, and for 200 msec (100 msec min.) after VCC rises above reset threshold. The output stage of the TC1274 is complimentary.
DS21382B-page 4
2003 Microchip Technology Inc.
TC1272/TC1273/TC1274
4.0
4.1
APPLICATIONS INFORMATION
Operation - Power Monitor
tR
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(MIN)
VCCTP
VCC tRPU2
tR VCCTP(MAX) VCCTP
RESET
VOL
VCCTP(MIN)
FIGURE 4-3: (TC1274).
Timing Diagram - Power Up
VCC tRPU1 VOH RESET VCC VCCTP(MAX) VCCTP
tF
VCCTP(MIN)
FIGURE 4-1: Timing Diagram - Power Up (TC1272/TC1273).
VOH RESET VCCTP(MAX) VCCTP VCCTP(MIN)
tRPD2
VCC
tF
RESET Slews With VCC
FIGURE 4-4: Timing Diagram - Power Down (TC1274).
RESET
tRPD1
VOL
FIGURE 4-2: Timing Diagram - Power Down (TC1272/TC1273).
2003 Microchip Technology Inc.
DS21382B-page 5
TC1272/TC1273/TC1274
4.2 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.
VCC VTH Overdrive
Duration MAXIMUM TRANSIENT DURATION (sec) 500 TA = +25C 400
4.3
RESET Signal Integrity During Power-Down
300 200 TC1272/3/4
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 P 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 k will be suitable for most applications). Similarly, a pull-up resistor to V CC is required for the TC1274 to ensure a valid high RESET for VCC below 1.8V.
100 0 1
10 1000 100 RESET COMPARATOR OVERDRIVE, [VCCTP-V CC] (mV)
FIGURE 4-5: Maximum Transient Duration vs. Overdrive For Glitch Rejection At +25C.
VCC
VCC
TC1272
RESET R1 GND 100 k
FIGURE 4-6: Vcc = 0V.
Ensuring Reset Valid To
DS21382B-page 6
2003 Microchip Technology Inc.
TC1272/TC1273/TC1274
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
3-Pin SOT-23B
3
12
3
4
1
2
1
&
2
represents part number code + temperature range and voltage TC1272 Code X1 X2 X3 TC1273 Code Y1 Y2 Y3 TC1274 Code Z1 Z2 Z3
Reset VCC Threshold (V) 4.62 4.37 4.12
3 4
represents year and quarter code represents lot ID number
2003 Microchip Technology Inc.
DS21382B-page 7
TC1272/TC1273/TC1274
3-Lead Plastic Small Outline Transistor (TT) (SOT23)
E E1 2
B n p 1
p1
D
c A A2
L
A1
Number of Pins Pitch Outside lead pitch (basic) Overall Height Molded Package Thickness Standoff Overall Width Molded Package Width Overall Length Foot Length Foot Angle Lead Thickness Lead Width Mold Draft Angle Top Mold Draft Angle Bottom * Controlling Parameter Significant Characteristic
Units Dimension Limits n p p1 A A2 A1 E E1 D L c B
MIN
INCHES* NOM 3 .038 .076 .040 .037 .002 .093 .051 .115 .018 5 .006 .017 5 5
MAX
MIN
.035 .035 .000 .083 .047 .110 .014 0 .004 .015 0 0
.044 .040 .004 .104 .055 .120 .022 10 .007 .020 10 10
MILLIMETERS NOM 3 0.96 1.92 0.89 1.01 0.88 0.95 0.01 0.06 2.10 2.37 1.20 1.30 2.80 2.92 0.35 0.45 0 5 0.09 0.14 0.37 0.44 0 5 0 5
MAX
1.12 1.02 0.10 2.64 1.40 3.04 0.55 10 0.18 0.51 10 10
Notes: Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010" (0.254mm) per side. JEDEC Equivalent: TO-236 Drawing No. C04-104
DS21382B-page 8
2003 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. Device XX Reset V CC Threshold X Temperature Range /XX Package Examples:
a) b) c)
Device: TC1272: TC1273: TC1274: 5 10 15 E 3-Pin Reset Monitor - Complementary 3-Pin Reset Monitor - Open Drain 3-Pin Reset Monitor - Complementary
TC1272-10ENBTR: 4.37V Reset TC1272-15ENBTR: 4.12V Reset TC1272-5ENBTR: 4.62V Reset
a) b) c) a) b) c)
TC1273-10ENBTR: 4.37V Reset TC1273-15ENBTR: 4.12V Reset TC1273-5ENBTR: 4.62V Reset
Reset VCC Threshold Voltage
= 4.62V = 4.37V = 4.12V = -40C to +85C
TC1274-10ENBTR: 4.37V Reset TC1274-15ENBTR: 4.12V Reset TC1274-5ENBTR: 4.62V Reset
Temperature Range: Package:
NB = Plastic Small Outline Transistor (SOT-23), 3-lead
Sales and Support
Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. 2. 3. Your local Microchip sales office The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using. Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
2003 Microchip Technology Inc.
DS21382B-page9
TC1272/TC1273/TC1274
NOTES:
DS21382B-page 10
2003 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 intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip's products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights.
Trademarks The Microchip name and logo, the Microchip logo, KEELOQ, MPLAB, PIC, PICmicro, PICSTART, PRO MATE and PowerSmart are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. FilterLab, microID, MXDEV, MXLAB, PICMASTER, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Accuron, Application Maestro, dsPIC, dsPICDEM, dsPICDEM.net, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, PICC, PICkit, PICDEM, PICDEM.net, PowerCal, PowerInfo, PowerMate, PowerTool, rfLAB, rfPIC, Select Mode, SmartSensor, SmartShunt, SmartTel and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. Serialized Quick Turn Programming (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) 2003, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved.
Printed on recycled paper. Microchip received QS-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona in July 1999 and Mountain View, California in March 2002. The Company's quality system processes and procedures are QS-9000 compliant for its PICmicro (R) 8-bit MCUs, KEELOQ(R) code hopping devices, Serial EEPROMs, microperipherals, non-volatile memory and analog products. In addition, Microchip's quality system for the design and manufacture of development systems is ISO 9001 certified.
2003 Microchip Technology Inc.
DS21382B - page 11
M
WORLDWIDE SALES AND SERVICE
AMERICAS
Corporate Office
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03/25/03
DS21382B-page 12
2003 Microchip Technology Inc.

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