Datenblatt-Suchmaschine für elektronische Bauteile |
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TC51N5002ECBTR Datenblatt(PDF) 5 Page - Microchip Technology |
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TC51N5002ECBTR Datenblatt(HTML) 5 Page - Microchip Technology |
5 / 14 page 2002 Microchip Technology Inc. DS21429B-page 5 TC51 4.0 APPLICATIONS INFORMATION 4.1 Processor RESET Supervisor Figure 4-1 shows the TC51 used as a processor reset supervisor. Because the TC51 is available in threshold settings of 1.6V to 6.0V, the user can choose the reset single threshold setting best suited to the system power supply voltage at hand. Also, the 1 µA supply current is significantly lower than its nearest competitor. As shown in the timing diagram (Figure 3-1),VOUT is low for voltages between 0.7V and VDET+. The TC51 activates its on-board delay timer once the power supply voltage is within tolerance (i.e., greater than VDET+). VOUT is released after delay time (TDLY). Should the power supply voltage momentarily dip (“brown-out” condition), the TC51 immediately drives and holds the processor RESET input low. RESET is released after the power supply voltage is again within tolerance, and after the delay timer expires. RESET is driven and held low when power fails (power-off or “blackout”), and is maintained down low to a supply voltage of 0.7V. FIGURE 4-1: PROCESSOR RESET SUPERVISOR FIGURE 4-2: TC51 OPERATION DURING POWER-UP, BROWN-OUT AND POWER DOWN TC51 VOUT GND VDD VDD Processor RESET R1 47K 0.7V Power-Up Steady State Operation TDLY Time TDLY Brown-Out Power Down Nominal Power Supply Voltage Threshold Voltage (VDET-, VDET+) VOH TC51 Output VOL |
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