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MAX6354 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX6354 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 11 page Dual/Triple-Voltage µP Supervisory Circuits _______________________________________________________________________________________ 7 Detailed Description Supply Voltages The MAX6351–MAX6360 microprocessor (µP) superviso- ry circuits maintain system integrity by alerting the µP to fault conditions. These ICs monitor multiple-supply sys- tems. The output reset state is guaranteed to remain viable while either VCC1 or VCC2 is above +1V. Threshold Levels All the possible input voltage threshold level combina- tions are indicated by a two-letter code in the Voltage Threshold Levels table. Reset Outputs The MAX6351 provides two active-low, push-pull reset outputs, one corresponding to each of its two moni- tored voltages. The MAX6353/MAX6356/MAX6359 have an active-low, push-pull reset output that is referenced to VCC1. The MAX6354/MAX6357/MAX6360 have an active-low, push-pull reset output that is referenced to VCC2. The MAX6352/MAX6355/MAX6358 provide an active-low open-drain reset. The reset outputs are maintained as long as at least one of the supplies is above +1V. Negative-Going VCC Transients The MAX6351–MAX6360 are designed to ignore short negative-going VCC1 and VCC2 transients. See the Maximum VCC Transient Duration vs. Reset Threshold Overdrive graph in the Typical Operating Characteristics. Third Input Voltage (MAX6355/MAX6356/MAX6357) The MAX6355/MAX6356/MAX6357 provide an addition- al input to monitor a third voltage. The threshold voltage at RSTIN is typically 1.22V. To monitor a voltage higher than 1.22V, connect a resistive divider to the circuit as shown in Figure 2. The threshold at VEXT is: Note that RSTIN is powered by VCC1, and its voltage must therefore remain lower than or equal to VCC1. Watchdog Input (MAX6358/MAX6359/MAX6360) The MAX6358/MAX6359/MAX6360 include a dual- mode watchdog timer to monitor µP activity. The flexi- ble timeout architecture provides a startup mode, allowing complicated systems to complete lengthy boots, and a normal mode, allowing the supervisor to provide quick alerts when processor activity fails. V 1.22V R1 R2 R2 EXT_TH = + WATCHDOG TIMER VCC1 (5) 6 4 (5) (5) 2 GND NOTE: PIN 1 IS RST1 FOR THE MAX6351 AND RST FOR THE MAX6352–MAX6360. PIN 5 IS RST2 FOR THE MAX6351, RSTIN FOR THE MAX6355/MAX6356/MAX6357, WDI FOR THE MAX6358/ MAX6359/MAX6360, AND VCC1 FOR THE MAX6352/MAX6353/MAX6354. VCC2 MR (RSTIN) RST (1) RST2 (5) (1) RST1 (WDI) RESET GENERATOR GLITCH FILTER MAX6351–MAX6360 VTH1 VTH2 1.22V 3 Figure 1. Functional Diagram Figure 2. Monitoring a Third Voltage VEXT R1 R2 VCC1 ≥ VRSTIN RSTIN MAX6355 MAX6356 MAX6357 |
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