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MAX6740 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX6740 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 16 page Low-Power Dual-/Triple-Voltage SC70 µP Supervisory Circuits 10 ______________________________________________________________________________________ Detailed Description Supply Voltages The MAX6736–MAX6745 µP supervisory circuits main- tain system integrity by alerting the µP to fault condi- tions. These devices are optimized for systems that monitor two or three supply voltages. The reset output state is guaranteed to remain valid while either VCC1 or VCC2 is above 1.2V. Threshold Levels The MAX6736/MAX6737/MAX6740/MAX6741/MAX6743/ MAX6744 input voltage threshold combinations are indi- cated by a two-letter code in Table 1. The MAX6738/ MAX6739/MAX6742/MAX6745 input voltage thresholds are indicated by a one-letter code in Table 2. Contact the factory for the availability of other voltage thresholds. Reset Output The MAX6736–MAX6745 provide an active-low reset out- put (RESET). RESET is asserted when the voltage at either VCC1 or VCC2 falls below the voltage threshold level, RSTIN drops below the threshold, or MR is pulled low. Once reset is asserted, it stays low for the reset time- out period. If VCC1, VCC2, or RSTIN goes below the reset threshold before the reset timeout period is completed, the internal timer restarts. The MAX6736/MAX6738/ MAX6740/MAX6741/MAX6742 have open-drain reset out- puts, while the MAX6737/MAX6739/MAX6743/MAX6744/ MAX6745 have push-pull reset outputs (Figure 1). The MAX6740/MAX6741/MAX6742 include a RESET output with a manual reset detect function. The open- drain RESET output has an internal 50k Ω pullup to VCC1. The RESET output is low while the output is pulled to GND and remains low for at least the manual reset timeout period after the external GND pulldown is VTH1 VCC1 GND GND tRP tMRP GND POK1 GND VTH2 VCC2 GND tPOKP MR RESET SWITCH BOUNCE SWITCH BOUNCE Figure 1. Timing Diagram |
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