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TCM810TEN Datasheet(PDF) 5 Page - Microchip Technology |
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TCM810TEN Datasheet(HTML) 5 Page - Microchip Technology |
5 / 16 page © 2005 Microchip Technology Inc. DS21661D-page 5 TCM809/TCM810 4.0 APPLICATIONS INFORMATION 4.1 VDD Transient Rejection The TCM809/TCM810 provides accurate VDD monitor- ing and reset timing during power-up, power-down and brown-out/sag conditions. These devices also reject negative-going transients (glitches) on the power supply line. Figure 4-1 shows the maximum transient duration vs. maximum negative excursion (overdrive) for glitch rejection. Any combination of duration and overdrive that lies under the curve will not generate a reset signal. FIGURE 4-1: Maximum Transient Duration vs. Overdrive for Glitch Rejection at +25°C. Combinations above the curve are detected as a brown-out or power-down condition. Transient immunity can be improved by adding a capacitor in close proximity to the VDD pin of the TCM809/TCM810. 4.2 RESET Signal Integrity During Power-Down The TCM809 RESET output is valid to VDD = 1.0V. Below this voltage the output becomes an "open cir- cuit" and does not sink current. This means CMOS logic inputs to the microcontroller 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 main- tained valid to VDD = 0V, a pull-down resistor must be connected from RESET to ground to discharge stray capacitances and hold the output low (Figure 4-2). This resistor value, though not critical, should be chosen such that it does not appreciably load RESET under normal operation (100 k Ω will be suitable for most applications). Similarly, a pull-up resistor to VDD is required for the TCM810 to ensure a valid high RESET for VDD below 1.0V. FIGURE 4-2: The addition of R1 at the RESET output of the TCM809 ensures that the RESET output is valid to VDD = 0V. Reset Comparator Overdrive [V TH – VDD] (mv) 400 240 160 320 80 0 1 5 100 1000 T A = +25°C V TH Duration Overdrive V DD TCM8XXL/M/J (SOT-23) TCM8XXZ/R/S/T (SOT-23) [V TH – VDD] (mv) 30 40 50 60 70 80 90 100 110 120 130 1 10 100 1000 Reset Comparator Overdrive (mV) TCM8XXL/M/J (SC-70) TCM8XXZ/R/S/T (SC-70) TCM809 V DD V DD R1 100 k Ω RESET GND |
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