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TC1270/TC1271
4-Pin P Reset Monitors
Features
* Precision VCC Monitor for 1.8V, 2.7V, 3.0V, 3.3V and 5.0V Nominal Supplies * Manual Reset Input * 140msec Minimum RESET, RESET Output Duration * RESET Output Valid to V CC = 1.0V (TC1270) * Low 7A 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
Package Type
4-Pin SOT-143
4 VCC
GND
1
TC1270 TC1271
TC1270 RESET TC1271 (RESET) 2 3 MR
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 20sec (4sec for F version) of VCC falling through the reset voltage threshold. RESET is maintained active for a minimum of 140msec 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 7A (VCC = 3.3V) makes these devices suitable for battery powered applications.
Applications
* * * * Computers Embedded Systems Battery Powered Equipment Critical P Power Supply Monitoring
Device Selection Table
Part Number TC1270xERC TC1271xERC Package 4-Pin SOT-143 4-Pin SOT-143 Temp. Range -40C to +85C -40C to +85C
NOTE: "x" denotes a suffix for VCC threshold (see table below)
Suffix* L M T S R F
Reset VCC Threshold (V) 4.63 4.38 3.08 2.93 2.63 1.75
Typical Operating Circuit
VCC VCC VCC Processor MR PushButton RESET RESET Input (Active Low) GND
*Custom thresholds available, contact factory.
TC1270
GND
2002 Microchip Technology Inc.
DS21381B-page 1
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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 (V CC to GND) .............................+6.0V RESET, RESET.......................... -0.3V to (VCC + 0.3V) Input Current, VCC ...............................................20mA Output Current, RESET, RESET .........................20mA Operating Temperature Range............. -40C to +85C Storage Temperature Range .............. -65C to +150C
TC1270/TC1271 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. TA = -40C to +85C unless otherwise noted. Typical values are at TA = +25C. (Note 1). Symbol VCC ICC VCC Range Supply Current Parameter Min 1.2 -- -- -- 4.54 4.50 4.30 4.25 3.03 3.00 2.88 2.85 2.58 2.55 1.71 1.70 -- -- -- 140 10 -- -- 2.3 -- 0.7 VCC -- MR Pull-up Resistance
Note 1: 2:
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
Test Conditions
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 VCC = VTH to VTH - 125mV; L/M/R/S/T/F VCC = VTH(MAX)
VTH
Reset Threshold
V
Reset Threshold Tempco VCC to Reset Delay tRP tMR tMD VIH VIL VIH VIL Reset Active Timeout Period MR Minimum Pulse Width MR Glitch Immunity MR to Reset Propagation Delay MR Input Threshold
ppm/C sec msec sec sec sec V V k VCC > VTH(MAX), TC127_L/M VCC > VTH(MAX), TC127_R/S/T/F
10
Production testing done at TA = +25C, over temperature limits ensured by design. RESET output for TC1270, RESET output for TC1271.
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DS21381B-page 2
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TC1270/TC1271
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. TA = -40C to +85C unless otherwise noted. Typical values are at TA = +25C. (Note 1). Symbol V OH VOL Parameter RESET Output Voltage High (TC1271) RESET Output Voltage Low (TC1271) Min 0.8 VCC Typ -- Max -- Units V V -- -- 0.2 Test Conditions ISOURCE = 150A; VCC VTH(MIN) TC1271F only, ISINK = 500A, VCC = VTH(MAX) TC1271R/S/T only, ISINK = 1.2mA, VCC = VTH(MAX) TC1271L/M only, ISINK = 3.2mA, VCC = VTH(MAX) V TC1270R/S/T only, ISINK = 1.2mA, VCC = VTH(MIN) TC1270F only: ISINK = 500A, VCC = VTH(MIN) TC1270L/M only, ISINK = 3.2mA, VCC = VTH(MIN) ISINK = 50A, VCC > 1.0V V TC1270L/M only, ISOURCE = 800A, VCC = VTH(MAX) TC1270R/S/T/F only, ISOURCE = 500A, VCC = VTH(MAX)
-- -- VOL RESET Output Voltage Low (TC1270) --
-- -- --
0.3 0.4 0.3
-- -- V OH RESET Output Voltage High (TC1270) VCC - 1.5
-- -- --
0.4 TBD --
0.8 VCC
--
--
Note
1: 2:
Production testing done at TA = +25C, over temperature limits ensured by design. RESET output for TC1270, RESET output for TC1271.
2002 Microchip Technology Inc.
DS21381B-page 3
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TC1270/TC1271
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No. (SOT-143-4) 1 2 2 3 4
PIN FUNCTION TABLE
Symbol GND RESET (TC1270) RESET (TC1271) MR V CC Ground. RESET output remains low while VCC is below the reset voltage threshold, and for at least 140msec min. after VCC rises above reset threshold. RESET output remains high while VCC is below the reset voltage threshold, and for at least 140msec min. after VCC rises above reset threshold. Manual reset input generates a reset when MR is below VIL. Supply voltage. Description
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DS21381B-page 4
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TC1270/TC1271
3.0
3.1
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 3-1 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 TC1270/TC1271.
be connected from RESET to ground to discharge stray capacitances and hold the output low (Figure 3-2). This resistor value, though not critical, should be chosen such that it does not appreciably load RESET under normal operation (100k 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.
FIGURE 3-2:
ENSURING RESET VALID TO VCC = 0V
VCC
VCC
FIGURE 3-1:
MAXIMUM TRANSIENT DURATION VS. OVERDRIVE FOR GLITCH REJECTION AT 25C
TC1270
RESET R1 100k
VCC VTH Overdrive
GND
3.3
Processors With Bidirectional I/O Pins
Duration
MAXIMUM TRANSIENT DURATION (sec)
400
TA
C
320
240
160 TC127LMJ 80 TC127xR/S/T 0 1 10 1000 100 RESET COMPARATOR OVERDRIVE, VTH - VCC (mV)
Some P'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 3-3). 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 P, the buffer should be connected as shown with the solid line.
FIGURE 3-3:
INTERFACING TO BIDIRECTIONAL RESET I/O
Buffer Buffered RESET To Other System Components
VCC
3.2
RESET Signal Integrity During Power-Down
VCC
VCC P 4.7k RESET
The TC1270 RESET output is valid to V CC = 1.0V. 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
TC1270
RESET
GND
GND
2002 Microchip Technology Inc.
DS21381B-page 5
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TC1270/TC1271
4.0
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 (A)
Supply Current vs.Temperature (No Load, TC127xL/M)
8
SUPPLY CURRENT (A)
10 8 6 4 VCC = 1V 2 0 -40 VCC = 5V V VCC = 3V V
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)
POWER-DOWN RESET DELAY (sec) 50 L/M 40
50
40 30 VOD = 20mV 20
VOD = 20 0mV VOD = 100mV
VOD = 200mV
30 R/S/T 20 VOD = 200mV VOD = 100mV VOD = 20mV
10 VOD = 100mV VOD = 200 mV 0 -40 -20
10
0
20
40
60
85
0 -40
-20
0
20
40
60
85
TEMPERATURE (C)
TEMPERATURE (C)
Power-Up Reset Timeout vs. Temperature
POWER-UP RESET TIMEOUT (msec) 250
1.0030 NORMALIZED THRESHOLD (V) 1.0020
Normalized Reset Threshold vs. Temperature
245 TC127xL/M 240 TC127xR/S/T/F
1.0010 1.0000 0.9990 0.9980 0.9970 0.9960 0.9950 0.9940
235
230
225 -40
-20
0
20
40
60
85
-40
-15
TEMPERATURE (C)
35 10 TEMPERATURE (C)
60
65
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DS21381B-page 6
2002 Microchip Technology Inc.
TC1270/TC1271
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
Part Number TC1271LERC TC1271MERC TC1271TERC TC1271SERC TC1271RERC TC1271FERC
3 4
(V) 4.63 4.38 3.08 2.93 2.63 1.75
Code T1 T2 T3 T4 T5 T7
represents year and quarter code represents production lot ID code
1
&
2
= part number code + temperature range (two-digit code)
(V) 4.63 4.38 3.08 2.93 2.63 1.75 Code S1 S2 S3 S4 S5 S7
Part Number TC1270LERC TC1270MERC TC1270TERC TC1270SERC TC1270RERC TC1270FERC
5.2
Package Dimensions
4-Pin SOT-143
.079 (2.00) .071 (1.80)
.098 (2.50) .083 (2.10)
.055 (1.40) .047 (1.20)
.080 (2.03) .070 (1.78) .120 (3.05) .105 (2.67)
.040 (1.02) .031 (0.79) .004 (0.10) .001(0.02) .037 (0.94) .030 (0.77) .021 (0.54) .015 (0.38)
8 MAX. .010 (0.25) .005 (0.13)
.006 (0.15) .004 (0.09)
Dimensions: inches (mm)
2002 Microchip Technology Inc.
DS21381B-page 7
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TC1270/TC1271
NOTES:
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DS21381B-page 8
2002 Microchip Technology Inc.
TC1270/TC1271
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. New Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
2002 Microchip Technology Inc.
DS21381B-page9
TC1270/TC1271
NOTES:
DS21381B-page10
2002 Microchip Technology Inc.
TC1270/TC1271
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, FilterLab, KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER, PICSTART, PRO MATE, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, MXDEV, MXLAB, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. 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) 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved.
Printed on recycled paper.
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2002 Microchip Technology Inc.
DS21381B-page 11
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DS21381B-page 12
2002 Microchip Technology Inc.

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