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MAX6418UK-T Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX6418UK-T Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 12 page monitor voltages other than VCC. Calculate VMON_TH as shown in the Reset Threshold section. (See Figure 3.) Dual-Voltage Monitoring (MAX6418/MAX6419/MAX6420) The MAX6418/MAX6419/MAX6420 contain both facto- ry-trimmed threshold voltages and an adjustable reset threshold input, allowing the monitoring of two voltages, VCC and VMON_TH (see Figure 4). Reset is asserted when either of the voltages falls below its respective threshold voltage. Application Information Selecting a Reset Capacitor The reset timeout period is adjustable to accommodate a variety of µP applications. Adjust the reset timeout period (tRP) by connecting a capacitor (CSRT) between SRT and ground. Calculate the reset timeout capacitor as follows: CSRT = (tRP - 275µs) / (2.73 106) where tRP is in seconds and CSRT is in Farads Low-Power, Single/Dual-Voltage µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay _______________________________________________________________________________________ 7 RESET CIRCUITRY LASER-TRIMMED RESISTORS VCC VCC 1.26V RESET IN GND R1 R2 SRT CSRT (RESET) RESET VMON_TH MAX6418 MAX6419 MAX6420 MAX6420 ONLY RL µP Figure 4. MAX6418/MAX6419/MAX6420 Monitoring Two Voltages |
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