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TC1275/TC1276/TC1277
3-Pin Reset Monitors for 3.3V Systems
Features
* Precision VCC Monitor for 3.3V Systems * 100msec Minimum RESET, RESET Output Duration * Output Valid to VCC = 1.2V * VCC Transient Immunity * Small 3-Pin SOT-23B Package * No External Components
General Description
The TC1275/TC1276/TC1277 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 20sec of VCC falling through the reset voltage threshold. RESET is maintained active for a minimum of 100msec after VCC rises above the reset threshold. The TC1277 has an active-high RESET output while the TC1275 and TC1276 have an active-low RESET output. TC1275 and TC1277 each have a complimentary output while the TC1276 has an open drain output. The output of the TC1275 and TC1276 is valid down to VCC = 1.2V. The TC1277 is valid down to VCC = 1.8V. All three devices are available in a 3-Pin SOT-23B package. The TC1275/TC1276/TC1277 devices are optimized to reject fast transient glitches on the VCC line.
Applications
* * * * Computers Embedded Systems Battery Powered Equipment Critical P Power Supply Monitoring
Device Selection Table
Part Number
TC1275-xENB TC1276-xENB TC1277-xENB
Order
Complimentary Open Drain Complimentary
Package
3-Pin SOT-23B 3-Pin SOT-23B 3-Pin SOT-23B
Temp. Range
-40C to +85C -40C to +85C -40C to +85C
Typical Operating Circuit
VCC 2 VCC 1 RESET VCC Processor RESET Input
NOTE: "x" denotes a suffix for VCC threshold (see table below).
Suffix 5 10 20
Reset VCC Threshold (V) 3.06 2.88 2.55
TC1275
GND 3 GND
Package Type
3-Pin SOT-23B
RESET *(RESET) 1 TC1275-xENB TC1276-xENB TC1277-xENB VCC 2
3
GND
NOTE: 3-Pin SOT-23B is equivalent to JEDEC TO-236 *( ) is for TC1277
2002 Microchip Technology Inc.
DS21383B-page 1
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TC1275/TC1276/TC1277
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 Power Dissipation (TA 70C) 3-Pin SOT-23B (derate 4mW/C above +70C) .................................................................230mW Operating Temperature Range............. -40C to +85C Storage Temperature Range .............. -65C to +150C
TC1275/TC1276/TC1277 ELECTRICAL SPECIFICATIONS
Recommended DC Operating Conditions: TA = -40C to +85C unless otherwise noted. Typical values are at TA = +25C. Symbol VCC Parameter Supply Voltage Min 1.2 1.8 Typ -- -- Max 5.5 5.5 Units V Device Test Conditions
TC1275, TC1276 Note 1 TC1277
DC Electrical Characteristics: TA = -40C to +85C unless otherwise noted. Typical values are at TA = +25C. Symbol VOH IOH Parameter Output Voltage @ 0-500A Output Current @ 2.4 Volts VCC = 5V VCC = 2.7V Output Current @ 0.4 Volts Operating Current VCC < 5.5V VCCTP < VCC < 5.5V VCC < VCCTP VCC Trip Point (TC1275/6/7-5) Min Typ Max -- -- -- -- 35 35 700 3.15 2.97 2.64 -- 9.0 V V V pF k TC1276 mA A -- -- -- 2.98 2.80 2.47 -- 3.0 20 20 350 3.06 2.88 2.55 9 6.0 TC1275, TC1277 Note 3 TC1276 Note 3 TC1276 Note 3 Note 1 Note 1 Note 1 Units V mA -- -- +10 13 1.3 30 TC1275 TC1277 Note 2 Note 2, Note 5 Test Conditions TC1275, TC1277 Note 1
VCC - 0.5V VCC - 0.1V
IOL ICC
VCCTP-5
VCCTP-10 VCC Trip Point (TC1275/6/7-10) VCCTP-20 VCC Trip Point (TC1275/6/7-20) COUT RP Symbol tRST tRPD1 tRPD2 tF tR tRPU1 tRPU2
Note 1: 2: 3: 4: 5:
Output Capacitance Internal Pull-Up Resistor
AC Electrical Characteristics: TA = -40C to +85C unless otherwise noted. Typical values are at TA = +25C. Parameter RESET Active Time VCC Detect to RESET VCC Detect to RESET VCC Slew Rate (VCCTP(MAX) to VCCTP(MIN)) VCC Slew Rate (VCCTP(MIN) to VCCTP(MAX)) VCC Detect to RESET VCC Detect to RESET Min 100 -- -- 300 0 100 100 Typ 200 20 20 -- -- 200 200 Max 300 50 50 -- -- 300 300 Units msec sec TC1275, TC1276 VCC(LOW) = 1V, Figure 3-2 sec TC1277 sec nsec VCC(LOW) = 1V, Figure 3-4 Figure 3-2, Figure 3-4 Figure 3-1, Figure 3-3 Test Conditions
msec TC1275, TC1276 Note 4, Figure 3-1 msec TC1277 Note 4, Figure 3-3
All voltages referenced to ground. Measured with VCC 2.7 volts. Measured with RESET output open for TC1275/TC1276; measured with RESET output open for TC1277. tR = 5sec. A 1k external resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using the TC1276.
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DS21383B-page 2
2002 Microchip Technology Inc.
TC1275/TC1276/TC1277
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No. (3-Pin SOT-23B) 1
PIN FUNCTION TABLE
Symbol RESET (TC1275/ TC1276) RESET (TC1277) Description RESET output remains low while VCC is below the reset voltage threshold, and for 200msec (100msec min.) after VCC rises above reset threshold. The output stage of the TC1275 is complimentary. The output stage of the TC1276 is open drain. RESET output remains high while VCC is below the reset voltage threshold, and for 200msec (100msec min.) after VCC rises above reset threshold. The output stage of the TC1277 is complimentary. Supply voltage (1.2V to 5.5V TC1275 and TC1276, 1.8V to 5.5V TC1277). Ground.
1
2 3
VCC GND
2002 Microchip Technology Inc.
DS21383B-page 3
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TC1275/TC1276/TC1277
3.0
3.1
APPLICATIONS INFORMATION
Operation - Power Monitor
FIGURE 3-3:
Timing Diagram - Power Up (TC1277)
tR
The TC1275/TC1276/TC1277 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-oftolerance, the RESET signal is asserted. On power-up, RESET is kept active for approximately 200msec after the power supply has reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RESET is released.
VCCTP(MAX) VCCTP(MIN) VCCTP
VCC tRPU2
FIGURE 3-1:
Timing Diagram - Power Up (TC1275/TC1276)
RESET
tR
VOL
VCCTP(MAX) VCCTP(MIN) VCCTP
FIGURE 3-4:
Timing Diagram - Power Down (TC1277)
tF
VCC tRPU1
VCC VCCTP(MAX) VCCTP
VOH
VCCTP(MIN)
RESET
tRPD2
FIGURE 3-2:
Timing Diagram - Power Down (TC1275/TC1276)
tF
VOH RESET SLEWS WITH VCC RESET
VCC VCCTP(MAX) VCCTP VCCTP(MIN)
tRPD1 RESET
VOL
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DS21383B-page 4
2002 Microchip Technology Inc.
TC1275/TC1276/TC1277
3.2 VCC Transient Rejection
FIGURE 3-5:
The TC1275/TC1276/TC1277 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 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 TC1275/TC1276/ TC1277.
MAXIMUM TRANSIENT DURATION VS. OVERDRIVE FOR GLITCH REJECTION AT 25C
VCC VTH Overdrive
Duration MAXIMUM TRANSIENT DURATION (sec) 500 TA 400 C
3.3
RESET Signal Integrity During Power-Down
The TC1275 RESET output is valid to V CC = 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 3-6). 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 TC1277 to ensure a valid high RESET for VCC below 1.8V.
300
200 TC1275/6/7
100 0 1
10 1000 100 RESET COMPARATOR OVERDRIVE, [VCCTP - VCC] (mV)
FIGURE 3-6:
ENSURING RESET VALID TO VCC = 0V
VCC
VCC
TC1275
RESET R1 100k
GND
2002 Microchip Technology Inc.
DS21383B-page 5
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TC1275/TC1276/TC1277
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.
VCC Detect To RESET (RESET)
VCC TO RESET DELAY (sec) TA = 25C 100000 V 10000
VCC TO RESET DELAY (sec) 300
Reset Delays vs. Comparator Overdrive
TA = 25C
200
1000
= 2V
100
100
10
1
10
100
1000
10000
100000
0 0 1 2 3 4 5 COMPARATOR OVERDRIVE (V)
VCC SLEW RATE (V/sec)
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DS21383B-page 6
2002 Microchip Technology Inc.
TC1275/TC1276/TC1277
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
TC1276 (V) 2.55 2.88 3.06 TC1277 (V) 2.55 2.88 3.06 ex: 1275-20 =
DA
Code EA EB EC Code FA FB FC
1
&
2
= part number code + temperature range and voltage Code DA DB DC
3 4
represents year and quarter code represents production lot ID code
TC1275 (V) 2.55 2.88 3.06
5.2
Taping Form
Component Taping Orientation for 3-Pin SOT-23B (JEDEC TO-236) Devices
User Direction of Feed
Device Marking
W
PIN 1
P Standard Reel Component Orientation For TR Suffix Device (Mark Right Side Up)
Carrier Tape, Number of Components Per Reel and Reel Size
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
3-Pin SOT-23B
8 mm
4 mm
3000
7 in
2002 Microchip Technology Inc.
DS21383B-page 7
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TC1275/TC1276/TC1277
5.3 Package Dimensions
3-Pin SOT-23B
.021 (0.54) .015 (0.37)
.104 (2.64) .083 (2.10)
.055 (1.40) .047 (1.20)
.024 (0.60) .017 (0.44)
.120 (3.05) .105 (2.67) 8 MAX. .010 (0.25) .005 (0.13) .007 (0.18) .003 (0.08)
.040 (1.02) .031 (0.79) .004 (0.10) .001 (0.02) .081 (2.05) .070 (1.78)
Dimensions: inches (mm)
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DS21383B-page 8
2002 Microchip Technology Inc.
TC1275/TC1276/TC1277
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.
DS21383B-page9
TC1275/TC1276/TC1277
NOTES:
DS21383B-page10
2002 Microchip Technology Inc.
TC1275/1276/1277
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.
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.
2002 Microchip Technology Inc.
DS21383B-page 11
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05/01/02
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DS21383B-page 12
2002 Microchip Technology Inc.

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