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MAX6419 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX6419 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 12 page 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) / (2.71 106) where tRP is in seconds and CSRT is in Farads The reset delay time is set by a current/capacitor-con- trolled ramp compared to an internal 0.65V reference. An internal 240nA ramp current source charges the external capacitor. The charge to the capacitor is cleared when a reset condition is detected. Once the reset condition is removed, the voltage on the capacitor ramps according to the formula: dV/dt = I/C. The CSRT capacitor must ramp to 0.65V to deassert the reset. CSRT must be a low-leakage (<10nA) type capacitor, ceramic is recommended. Operating as a Voltage Detector The MAX6412–MAX6420 can be operated in a voltage detector mode by leaving SRT unconnected. The reset delay times for VCC rising above or falling below the threshold are not significantly different. The reset output is deasserted smoothly without false pulses. Low-Power, Single/Dual-Voltage µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay MAX6412–MAX6420 Maxim Integrated 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 |
Similar Part No. - MAX6419_12 |
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Similar Description - MAX6419_12 |
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