TC1278/TC1279 3-Pin Reset Monitors for 5V Systems Features 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. Precision VCC Monitor for 5.0V System Supplies 250msec Minimum 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 µP Power Supply Monitoring The reset output is driven active within 5µsec of VCC falling through the reset voltage threshold. RESET is maintained active for a minimum of 250msec after VCC rises above the reset threshold. The TC1278 has an active-high RESET output while the TC1279 has an active-low RESET output, and both devices have an open drain output stage. The output is valid down to VCC = 1.2V. Both devices are available in a 3-Pin SOT23B package. Typical Operating Circuit Device Selection Table VCC Part Number Order Temp. Range Package 2 Processor TC1278-xENB Open Drain 3-Pin SOT-23B -40°C to +85°C 1 TC1279-xENB Open Drain 3-Pin SOT-23B -40°C to +85°C NOTE: “x” denotes a suffix for VCC threshold (see table below). Suffix Reset VCC Threshold (V) 5 4.625 10 4.375 15 4.125 VCC VCC RESET RESET Input TC1279 GND GND 3 Package Type 3-Pin SOT-23B RESET 1 TC1278-xENB TC1279-xENB VCC 3 GND 2 NOTE: 3-Pin SOT-23B is equivalent to JEDEC TO-236 2002 Microchip Technology Inc. DS21384B-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 (V CC to GND) ..............................+6.0V RESET, RESET...........................-0.3V to (VCC + 0.3V) Input Current, VCC ...............................................20mA Output Current, RESET....................................... 20mA Power Dissipation (TA ≤ 70°C) 3-Pin SOT-23B (derate 4mW/°C above +70°C) .................................................................230mW Operating Temperature Range............. -40°C to +85°C Storage Temperature Range .............. -65°C to +150°C TC1278/TC1279 ELECTRICAL SPECIFICATIONS Recommended DC Operating Conditions: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C. Symbol Parameter Supply Voltage VCC Min Typ Max Units 1.2 — 5.5 V Device Test Conditions Note 1 DC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C. Min Typ Max Units VOL Symbol Low Level @ RESET RESET Parameter — — 0.4 V IOL Output Current @ 0.4 Volts +8 — — mA ICC1 Operating Current — — 0.9 — 2.0 40 ICC2 Operating Current — — — 0.9 VCCTP-5 VCC Trip Point (TC1278/9-5) Test Conditions TC1278 TC1279 Note 1 mA µA TC1278 TC1279 VCC > VCCTP(MAX) VCC > VCCTP(MAX) 40 2.0 µA mA TC1278 TC1279 VCC < VCCTP(MIN) VCC < VCCTP(MIN) Note 2 4.50 4.625 4.74 V Note 1 VCCTP-10 VCC Trip Point (TC1278/9-10) 4.25 4.375 4.49 V Note 1 VCCTP-15 VCC Trip Point (TC1278/9-15) 4.00 4.125 4.24 V Note 1 COUT Output Capacitance — 9 — pF RP Internal Pull-Up Resistor 3 6 9 kΩ AC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C. Symbol Parameter Min Typ Max Units msec Test Conditions tRST RESET Active Time 250 350 450 tRPD1 VCC Detect to RESET — 2 5 µsec TC1279 tRPD2 VCC Detect to RESET — 2 5 µsec TC1278 Figure 3-4 tF VCC Slew Rate (4.75V-4.00V) 300 — — µsec Figure 3-2, Figure 3-4 tR VCC Slew Rate (4.00V-4.75V) 0 — — nsec Figure 3-1, Figure 3-3 tRPU1 VCC Detect to RESET 250 350 450 msec TC1279 Figure 3-1 tRPU2 VCC Detect to RESET 250 350 450 msec TC1278 Figure 3-3 Note 1: 2: Figure 3-2 All voltages referenced to ground. A 1kΩ external resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using the TC1279. VCC = 1.8V. DS21384B-page 2 2002 Microchip Technology Inc. TC1278/TC1279 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Pin No. (3-Pin SOT-23B) Symbol 1 RESET (TC1279) RESET output remains low while VCC is below the reset voltage threshold, and for 350msec (250msec min.) after VCC rises above reset threshold. The output stage of the TC1279 is open drain. 1 RESET (TC1278) RESET output remains high while VCC is below the reset voltage threshold, and for 350msec (250msec min.) after VCC rises above reset threshold. The output stage of the TC1278 is open drain. Description 2 VCC Supply voltage (1.2V to 5.5V). 3 GND Ground. 2002 Microchip Technology Inc. DS21384B-page 3 TC1278/TC1279 3.0 APPLICATIONS INFORMATION 3.1 Operation – Power Monitor 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 350msec after the power supply has reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RESET is released. FIGURE 3-1: FIGURE 3-3: Timing Diagram – Power Up (TC1278) tR VCCTP(MAX) VCCTP VCCTP(MIN) VCC tRPU2 Timing Diagram – Power Up (TC1279) VOL RESET tR FIGURE 3-4: 4.75V 4.00V Timing Diagram – Power Down (TC1278) VCCTP tF VCC VCC 4.74V tRPU1 VCCTP 4.00V VOH RESET tRPD2 FIGURE 3-2: Timing Diagram – Power Down (TC1279) VOH tF RESET SLEWS WITH VCC VCC RESET 4.75V VCCTP 4.00V tRPD1 RESET VOL DS21384B-page 4 2002 Microchip Technology Inc. TC1278/TC1279 3.2 VCC Transient Rejection FIGURE 3-5: The TC1278/TC1279 provides accurate VCC monitoring and reset timing during power-up, power-down, and brownout/sag conditions, and rejects negativegoing 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 VS. OVERDRIVE FOR GLITCH REJECTION AT 25°C VCC VCCTP Overdrive MAXIMUM TRANSIENT DURATION (µsec) Duration 5 TA °C 4 3 2 TC1278/9 1 0 1 5 1000 100 RESET COMPARATOR OVERDRIVE, [VCCTP - VCC] (mV) 2002 Microchip Technology Inc. DS21384B-page 5 TC1278/TC1279 4.0 PACKAGING INFORMATION 4.1 Package Marking Information 1 & 4.2 2 = part number code + temperature range and voltage Part Number TC1278-5ENB TC1278-10ENB TC1278-15ENB Code PA PB PC TC1279-5ENB TC1279-10ENB TC1279-15ENB RA RB RC 3 represents year and 2-month code 4 represents production lot ID code 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 3-Pin SOT-23B DS21384B-page 6 Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 8 mm 4 mm 3000 7 in 2002 Microchip Technology Inc. TC1278/TC1279 4.3 Package Dimensions 3-Pin SOT-23B .021 (0.54) .015 (0.37) .055 (1.40) .047 (1.20) .104 (2.64) .083 (2.10) .024 (0.60) .017 (0.44) .120 (3.05) .105 (2.67) .007 (0.18) .003 (0.08) 8° MAX. .040 (1.02) .031 (0.79) .004 (0.10) .001 (0.02) .081 (2.05) .070 (1.78) .010 (0.25) .005 (0.13) Dimensions: inches (mm) 2002 Microchip Technology Inc. DS21384B-page 7 TC1278/TC1279 NOTES: DS21384B-page 8 2002 Microchip Technology Inc. TC1278/TC1279 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. DS21384B-page9 TC1278/TC1279 NOTES: DS21384B-page10 2002 Microchip Technology Inc. TC1278/1279 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. © 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. 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