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TC1274 Dataheets PDF



Part Number TC1274
Manufacturers Microchip Technology
Logo Microchip Technology
Description Reset Monitors
Datasheet TC1274 DatasheetTC1274 Datasheet (PDF)

M Features TC1272/TC1273/TC1274 General Description The TC1272/TC1273/TC1274 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 20 µsec of VCC falling through the reset voltage threshold. RESET is maintained active for a minimum of 100 msec after VCC rises above the reset threshold. The TC1274 has an active-high RESE.

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M Features TC1272/TC1273/TC1274 General Description The TC1272/TC1273/TC1274 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 20 µsec of VCC falling through the reset voltage threshold. RESET is maintained active for a minimum of 100 msec after VCC rises above the reset threshold. The TC1274 has an active-high RESET output, while the TC1272 and TC1273 have an active-low RESET output. The TC1272 and TC1274 each have a complimentary output, while the TC1273 has an open-drain output. The output of the TC1272 and TC1273 is valid down to VCC = 1.2V. The TC1274 is valid down to VCC = 1.8V. All three devices are available in a 3-Pin SOT-23B package. The TC1272/TC1273/TC1274 devices are optimized to reject fast transient glitches on the VCC line. 3-Pin Reset Monitors for 5V Systems • Precision VCC Monitor for 5.0V Systems • 100 msec Minimum RESET, 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 Package Type 3-Pin SOT-23B* RESET **(RESET) 1 Typical Operating Circuit TC1272 TC1273 TC1274 VCC 3 GND 2 VCC RESET 1 VCC RESET Input VCC 2 TC1272 * 3-Pin SOT-23B is equivalent to JEDEC TO-236 **( ) is for TC1274 GND 3 Processor GND  2003 Microchip Technology Inc. DS21382B-page 1 TC1272/TC1273/TC1274 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 (VCC to GND) .............................+6.0V RESET, RESET.......................... -0.3V to (VCC + 0.3V) Input Current, VCC ..............................................20 mA Output Current, RESET, RESET ........................20 mA Power Dissipation (TA ≤ 70°C) 3-Pin SOT-23B (derate 4 mW/°C above +70°C) ................................................................230 mW Operating Temperature Range............. -40°C to +85°C Storage Temperature Range .............. -65°C to +150°C DC CHARACTERISTICS Electrical Specifications: Unless otherwise noted, TA = -40°C to +85°C. Typical values are at TA = +25°C. Parameters Supply Voltage TC1272, TC1273 TC1274 Output Voltage @ 0-500 µA Output Current @ 2.4 Volts VCC = 5V TC1272 VCC = 4V TC1274 Output Current @ 0.4 Volts Operating Current VCC < 5.5V: TC1272, TC1274 VCCTP < VCC < 5.5V: TC1273 VCC < VCCTP: TC1273 V CC Trip Point (TC1272/3/4-5) ICC ICC ICC V CCTP-5 — — — 4.50 4.25 4.00 — 3 100 — — 300 0 100 100 17 17 700 4.62 4.37 4.12 9 6 200 20 20 — — 200 200 40 40 1200 4.75 4.49 4.24 — 9 300 50 50 — — 300 300 µA µA µA V V V pF kΩ msec µsec µsec µsec nsec msec msec VCC(LOW) = 1V, Figure 4-2 VCC(LOW) = 1V, Figure 4-4 Figure 4-2, Figure 4-4 Figure 4-1, Figure 4-3 Note 4, Figure 4-1 Note 4, Figure 4-3 Note 3 Note 3 Note 3 Note 1 Note 1 Note 1 IOH IOH IOL — — +10 10 8 30 — — — mA mA mA Note 2, Note 5 Note 2 V CC V CC VOH 1.2 1.8 — — 5.5 5.5 — V V V TC1272, TC1274 (Note 1) Note 1 Sym Min Typ Max Units Conditions VCC – 0.5V VCC – 0.1V VCC Trip Point (TC1272/3/4-10) VCCTP-10 VCC Trip Point (TC1272/3/4-15) VCCTP-15 Output Capacitance Internal Pull-Up Resistor RESET Active Time VCC Detect to RESET TC1272, TC1273 VCC Detect to RESET - TC1274 VCC Slew Rate (VCCTP(MAX) to VCCTP(MIN)) VCC Slew Rate (VCCTP(MIN) to VCCTP(MAX)) VCC Detect to RESET TC1272, TC1273 VCC Detect to RESET - TC1274 Note 1: 2: 3: 4: 5: COUT RP tRST tRPD1 tRPD2 tF tR tRPU1 tRPU2 AC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C. All voltages referenced to ground. Measured with VCC ≥ 2.7 volts. Measured with RESET output open for TC1272/TC1273; measured with RESET output open for TC1274. tR = 5 µsec. A 1 kΩ external resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using the TC1273. DS21382B-page 2  2003 Microchip Technology Inc. TC1272/TC1273/TC1274 2.0 Note: TYPICAL PERFORMANCE CURVES 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. Note: Unless otherwise indicated, TA = -40°C to +85°C. Typi.


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