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MAX6347UR33-T Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX6347UR33-T Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 8 page 3-Pin, Ultra-Low-Power SC70/SOT µP Reset Circuits 4 _______________________________________________________________________________________ ____________ Applications Information Interfacing to µPs with Bidirectional Reset Pins Since the RESET output on the MAX6328/MAX6348 is open drain, these devices interface easily with micro- processors (µPs) that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the µP supervisor’s RESET output directly to the microcon- troller’s (µC’s) RESET pin with a single pull-up resistor allows either device to assert reset (Figure 1). Negative-Going VCC Transients In addition to issuing a reset to the µP during power-up, power-down, and brownout conditions, these devices are relatively immune to short-duration, negative-going VCC transients (glitches). The Typical Operating Characteristics show the Maxi- mum Transient Duration vs. Reset Threshold Overdrive graph, for which reset pulses are not generated. The graph shows the maximum pulse width that a negative- going VCC transient may typically have when issuing a reset signal. As the amplitude of the transient increas- es, the maximum allowable pulse width decreases. Figure 1. Interfacing to µPs with Bidirectional Reset Pins Table 1. Factory-Trimmed Reset Thresholds‡ ‡Factory-trimmed reset thresholds are available in approximately 100mV increments with a 1.5% room-temperature variance. RESET GND RESET INPUT MAX6328 MAX6348 MOTOROLA 68HCXX µP GND VCC VCC VCC 3.800 3.895 3.857 3.705 3.700 3.743 38 3.792 3.755 3.607 3.644 37 3.600 3.690 3.654 3.510 3.500 3.546 36 3.587 3.552 3.412 3.447 35 3.400 3.485 3.451 3.315 3.300 3.349 34 3.383 3.350 3.217 3.250 33 3.080 3.150 3.126 3.003 3.000 3.034 31 3.075 3.045 2.925 2.955 30 2.930 3.000 2.974 2.857 2.800 2.886 29 2.870 2.842 2.730 2.758 28 2.700 2.768 2.741 2.633 2.630 2.660 27 2.696 2.669 2.564 2.591 26 2.500 2.562 2.537 2.437 2.400 2.462 25 2.460 2.436 2.340 2.364 24 2.320 2.375 2.355 2.262 2.285 23 MIN TYP MAX MAX MIN TA = -40°C to +85°C TA = +25°C 2.250 RESET THRESHOLD VOLTAGE, VTH (V) 2.145 2.233 2.200 2.167 SUFFIX MAX634_ _R MAX634_ _R MAX634_ _R MAX634_ _R MAX634_ _R MAX634_ _R MAX632_ _R MAX632_ _R MAX632_ _R MAX632_ _R MAX632_ _R MAX632_ _R MAX632_ _R MAX632_ _R MAX632_ _R PART 22 MAX632_ _R |
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