TC1278-10ENB

TC1278/TC1279 3-Pin Reset Monitors for 5V Systems Features • • • • • • 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 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. 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. Applications • • • • Computers Embedded Systems Battery Powered Equipment Critical µP Power Supply Monitoring Device Selection Table Part Number Order Package Temp. Range Typical Operating Circuit VCC 2 VCC 1 RESET VCC Processor RESET Input TC1278-xENB Open Drain 3-Pin SOT-23B -40°C to +85°C TC1279-xENB Open Drain 3-Pin SOT-23B -40°C to +85°C NOTE: “x” denotes a suffix for VCC threshold (see table below). TC1279 GND 3 GND Suffix 5 10 15 Reset VCC Threshold (V) 4.625 4.375 4.125 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 VCC Symbol VOL IOL ICC1 ICC2 VCCTP-5 Parameter Supply Voltage Min 1.2 Typ — Max 5.5 Units 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. Parameter Low Level @ RESET RESET Output Current @ 0.4 Volts Operating Current Operating Current VCC Trip Point (TC1278/9-5) Min — +8 — — — — 4.50 4.25 4.00 — 3 Typ — — 0.9 — — 0.9 4.625 4.375 4.125 9 6 Max 0.4 — 2.0 40 40 2.0 4.74 4.49 4.24 — 9 Units V mA mA µA µA mA V V V pF kΩ Units msec µsec TC1279 µsec TC1278 µsec nsec msec TC1279 msec TC1278 Figure 3-2 Figure 3-4 Figure 3-2, Figure 3-4 Figure 3-1, Figure 3-3 Figure 3-1 Figure 3-3 Test Conditions TC1278 TC1279 TC1278 TC1279 TC1278 TC1279 Test Conditions Note 1 Note 2 VCC > VCCTP(MAX) VCC > VCCTP(MAX) VCC < VCCTP(MIN) VCC < VCCTP(MIN) Note 1 Note 1 Note 1 VCCTP-10 VCC Trip Point (TC1278/9-10) VCCTP-15 VCC Trip Point (TC1278/9-15) COUT RP Symbol tRST tRPD1 tRPD2 tF tR tRPU1 tRPU2 Note 1: 2: Output Capacitance Internal Pull-Up Resistor AC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C. Parameter RESET Active Time VCC Detect to RESET VCC Detect to RESET VCC Slew Rate (4.75V-4.00V) VCC Slew Rate (4.00V-4.75V) VCC Detect to RESET VCC Detect to RESET Min 250 — — 300 0 250 250 Typ 350 2 2 — — 350 350 Max 450 5 5 — — 450 450 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 No. (3-Pin SOT-23B) 1 PIN FUNCTION TABLE Symbol RESET (TC1279) Description 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. 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. Supply voltage (1.2V to 5.5V). Ground. 1 RESET (TC1278) 2 3 VCC GND 2002 Microchip Technology Inc. DS21384B-page 3 © TC1278/TC1279 3.0 3.1 APPLICATIONS INFORMATION Operation – Power Monitor FIGURE 3-3: Timing Diagram – Power Up (TC1278) tR 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. VCCTP(MAX) VCCTP(MIN) VCCTP VCC tRPU2 FIGURE 3-1: Timing Diagram – Power Up (TC1279) RESET tR VOL 4.75V 4.00V VCCTP FIGURE 3-4: Timing Diagram – Power Down (TC1278) tF VCC tRPU1 VCC 4.74V VCCTP VOH 4.00V RESET tRPD2 FIGURE 3-2: Timing Diagram – Power Down (TC1279) tF VOH RESET SLEWS WITH VCC RESET VCC 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 (µsec) 5 MAXIMUM TRANSIENT DURATION VS. OVERDRIVE FOR GLITCH REJECTION AT 25°C VCC VCCTP Overdrive Duration 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 4.1 PACKAGING INFORMATION Package Marking Information Part Number TC1278-5ENB TC1278-10ENB TC1278-15ENB TC1279-5ENB TC1279-10ENB TC1279-15ENB 3 4 Code PA PB PC RA RB RC represents year and 2-month code represents production lot ID code 1 & 2 = part number code + temperature range and voltage 4.2 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 © DS21384B-page 6 2002 Microchip Technology Inc. TC1278/TC1279 4.3 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) 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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