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MAX6359MRUK-T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6359MRUK-T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page 6 _______________________________________________________________________________________ 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 and derive their internal power from the highest volt- age source present at VCC5 and VCC3. In addition, the output reset state is guaranteed to remain viable while either VCC5 or VCC3 is above +1V. Threshold Levels All the possible input voltage threshold level combina- tions are indicated by a two-letter code in Voltage Threshold Levels. The two standard combinations are LS and SY. LS parts monitor one +5V ±5% supply and one +3.3V ±10% supply. SY parts monitor one +3.3V ±10% supply and one +2.5V ±10% supply. The other combinations also monitor +5V ±10% supplies, +3.3V ±5% supplies, and +3V ±5% supplies. Reset Outputs The MAX6351 provides a 5V active-low reset and a 3V active-low reset. The MAX6353/MAX6356/MAX6359 pro- vide a 5V active-low push-pull reset and the MAX6354/ MAX6357/MAX6360 provide a 3V active-low push-pull reset. The MAX6353/MAX6355/MAX6358 provide an active-low open-drain reset. The higher input voltages of VCC5 and VCC3 maintain the sinking capability of the low reset-output state. The reset outputs are maintained as long as either supply is above +1V. Negative-Going VCC Transients The MAX6351–MAX6360 are designed to ignore short negative-going VCC5 and VCC3 transients. See Typical Operating Characteristics for a glitch immunity graph. 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 resistor-divider to the circuit as shown in Figure 2. The threshold at V3 is: Note that RSTIN is powered by VCC5, and its voltage must therefore remain lower than VCC5. V 1.22 R1 R2 R2 3TH = + Dual/Triple-Voltage µP Supervisory Circuits WATCHDOG TIMER VCC5 (5) 6 4 (5) (5) 2 GND NOTE: PIN 1 IS RST5 FOR THE MAX6351 AND RST FOR THE MAX6352–MAX6360. PIN 5 IS RST3 FOR THE MAX6351, RSTIN FOR THE MAX6355/56/57, WDI FOR THE MAX6358/59/60, AND VCC FOR THE MAX6352/53/54. VCC3 MR (RSTIN) RST (1) RST3 (5) (1) RST5 (WDI) RESET GENERATOR GLITCH FILTER MAX6351–MAX6360 VTH5 VTH3 1.22V 3 Figure 1. Functional Diagram Figure 2. Monitoring a Third Voltage V3 R1 R2 VCC5 ≥ VRSTIN RSTIN MAX6355 MAX6356 MAX6357 |
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