TC1275/TC1276/TC1277 3-Pin Reset Monitors for 3.3V Systems Features General Description • 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 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. Applications • • • • Computers Embedded Systems Battery Powered Equipment Critical µP Power Supply Monitoring Device Selection Table Part Number Order Package Temp. Range TC1275-xENB Complimentary 3-Pin SOT-23B -40°C to +85°C TC1276-xENB Open Drain 3-Pin SOT-23B -40°C to +85°C TC1277-xENB Complimentary 3-Pin SOT-23B -40°C to +85°C NOTE: “x” denotes a suffix for VCC threshold (see table below). Suffix The reset output is driven active within 20µsec 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. Typical Operating Circuit VCC 2 VCC VCC Processor 1 Reset VCC Threshold (V) RESET 5 3.06 10 2.88 GND 20 2.55 3 RESET Input TC1275 GND Package Type 3-Pin SOT-23B RESET *(RESET) 1 TC1275-xENB TC1276-xENB TC1277-xENB VCC 3 GND 2 NOTE: 3-Pin SOT-23B is equivalent to JEDEC TO-236 *( ) is for TC1277 2002 Microchip Technology Inc. DS21383B-page 1 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 ≤ 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 TC1275/TC1276/TC1277 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 1.8 — — 5.5 5.5 V Device Test Conditions TC1275, TC1276 Note 1 TC1277 DC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C. Symbol Parameter Min Typ V Test Conditions VOH Output Voltage @ 0-500µA Output Current @ 2.4 Volts VCC = 5V VCC = 2.7V — — 13 1.3 — — IOL Output Current @ 0.4 Volts +10 30 — ICC Operating Current VCC < 5.5V VCCTP < VCC < 5.5V VCC < VCCTP — — — 20 20 350 35 35 700 2.98 3.06 3.15 V Note 1 VCCTP-10 VCC Trip Point (TC1275/6/7-10) 2.80 2.88 2.97 V Note 1 VCCTP-20 VCC Trip Point (TC1275/6/7-20) 2.47 2.55 2.64 V Note 1 COUT Output Capacitance — 9 — pF RP Internal Pull-Up Resistor 3.0 6.0 9.0 kΩ VCC Trip Point (TC1275/6/7-5) — Units IOH VCCTP-5 VCC – 0.5V VCC – 0.1V Max TC1275, TC1277 Note 1 mA TC1275 TC1277 mA Note 2 Note 2, Note 5 µA TC1275, TC1277 Note 3 TC1276 Note 3 TC1276 Note 3 TC1276 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 100 200 300 msec — 20 50 Test Conditions tRST RESET Active Time tRPD1 VCC Detect to RESET tRPD2 VCC Detect to RESET — 20 50 µsec TC1277 VCC(LOW) = 1V, Figure 3-4 tF VCC Slew Rate (VCCTP(MAX) to VCCTP(MIN)) 300 — — µsec Figure 3-2, Figure 3-4 tR VCC Slew Rate (VCCTP(MIN) to VCCTP(MAX)) 0 — — nsec Figure 3-1, Figure 3-3 tRPU1 VCC Detect to RESET 100 200 300 msec TC1275, TC1276 Note 4, Figure 3-1 VCC Detect to RESET 100 200 300 msec TC1277 tRPU2 Note 1: 2: 3: 4: 5: µsec TC1275, TC1276 VCC(LOW) = 1V, Figure 3-2 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 = 5µsec. A 1kΩ external resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using the TC1276. 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) PIN FUNCTION TABLE Symbol Description 1 RESET (TC1275/ TC1276) 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. 1 RESET (TC1277) 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. 2 VCC Supply voltage (1.2V to 5.5V TC1275 and TC1276, 1.8V to 5.5V TC1277). 3 GND Ground. 2002 Microchip Technology Inc. DS21383B-page 3 TC1275/TC1276/TC1277 3.0 APPLICATIONS INFORMATION 3.1 Operation – Power Monitor 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. FIGURE 3-1: FIGURE 3-3: Timing Diagram – Power Up (TC1277) tR VCCTP(MAX) VCCTP VCCTP(MIN) VCC tRPU2 Timing Diagram – Power Up (TC1275/TC1276) VOL RESET tR FIGURE 3-4: VCCTP(MAX) VCCTP(MIN) Timing Diagram – Power Down (TC1277) VCCTP tF VCC VCC VCCTP(MAX) tRPU1 VCCTP VCCTP(MIN) VOH RESET tRPD2 FIGURE 3-2: Timing Diagram – Power Down (TC1275/TC1276) VOH tF RESET SLEWS WITH VCC VCC RESET VCCTP(MAX) VCCTP VCCTP(MIN) tRPD1 RESET VOL DS21383B-page 4 2002 Microchip Technology Inc. TC1275/TC1276/TC1277 VCC Transient Rejection 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. 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 µP 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 (100kΩ 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. FIGURE 3-5: MAXIMUM TRANSIENT DURATION VS. OVERDRIVE FOR GLITCH REJECTION AT 25°C VCC VTH Overdrive Duration MAXIMUM TRANSIENT DURATION (µsec) 3.2 500 TA °C 400 300 200 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 GND 2002 Microchip Technology Inc. R1 100k DS21383B-page 5 TC1275/TC1276/TC1277 4.0 TYPICAL CHARACTERISTICS Note: 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. Reset Delays vs. Comparator Overdrive TA = 25°C 300 100000 V 10000 1000 = 2V 100 10 1 10 100 1000 10000 VCC SLEW RATE (V/µsec) DS21383B-page 6 100000 VCC TO RESET DELAY (µsec) VCC TO RESET DELAY (µsec) VCC Detect To RESET (RESET) TA = 25°C 200 100 0 0 1 2 3 4 5 COMPARATOR OVERDRIVE (V) 2002 Microchip Technology Inc. TC1275/TC1276/TC1277 5.0 PACKAGING INFORMATION 5.1 Package Marking Information TC1276 (V) 2.55 2.88 3.06 TC1277 (V) 2.55 2.88 3.06 Code EA EB EC Code FA FB FC ex: 1275-20 = 1 & 2 = part number code + temperature range and voltage TC1275 (V) 2.55 2.88 3.06 5.2 D A 3 represents year and quarter code 4 represents production lot ID code Code DA DB DC 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 2002 Microchip Technology Inc. Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 8 mm 4 mm 3000 7 in DS21383B-page 7 TC1275/TC1276/TC1277 5.3 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) 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. 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Le Colleoni 1 20041 Agrate Brianza Milan, Italy Tel: 39-039-65791-1 Fax: 39-039-6899883 United Kingdom Microchip Ltd. 505 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG41 5TU Tel: 44 118 921 5869 Fax: 44-118 921-5820 05/01/02 DS21383B-page 12 2002 Microchip Technology Inc. This datasheet has been download from: www.datasheetcatalog.com Datasheets for electronics components.