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9 / 17 page AME, Inc. 9 Rev. A.01 AME8570 µProcessor Supervisory n Detailed Description The AME8570 are designed to interface with the reset input of a microprocessor and to prevent code-execution errors due to power up, power down, and other power supply errors. Reset Output Each output pin in the family can be configured to be either push-pull or open-drain. In addition each output may be either active high or active low. Active high reset out- puts are denoted as RESET. Active low reset outputs are denoted as RESETB. The selection guide on this data sheet shows all possible combinations of output driver configuration. A reset will be asserted if any of two things happen: 1) V IN drops below the threshold (VTH) 2) The MRB pin is pulled low. The reset will remain asserted for the prescribed reset interval after: 1) V IN rises above the threshold (VTH) 2) MRB goes high Manual Reset Input The AME8570 feature a manual reset feature (MRB). A logic low on the MRB pin asserts a reset. The reset remains asserted as long as the MRB pin remains low. After the MRB pin transitions to a high state the reset remains asserted for the prescribed reset interval (T D2). The MRB pin is internally pulled up to V IN by a 100K resistor. It is internally debounced to reject switching transients. The MRB pin is ESD protected by diodes connected to V IN and GND. So the MRB pin should never be driven higher than V IN or lower than GND. Glitch Rejection The AME8570 family will reject negative going transients on the V IN line to some extent. The smaller the duration of the transient the larger its amplitude may be without triggering a reset. The "Glitch Rejection" chart in the graphs section of this datasheet shows the relation be- tween glitch amplitude and allowable glitch duration to avoid unintended resets. Accurate Output State at Low V IN With V IN voltage on the order of the MOS transistor threshold (<1.0V) the outputs of the AME8570 may be- come undefined. For parts with active low output (RESETB) a resistor placed between RESETB and GND on the order of 100K will ensure that the RESETB output stays low when V IN is lower than the threshold voltage of the part. In a like manner a resistor on the order of 100K when placed between RESET and V IN will ensure parts with active high output (RESET) will remain high when V IN is lower than the threshold voltage of the part. |
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