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MAX6346-44D Datasheet(PDF) 8 Page - NXP Semiconductors |
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MAX6346-44D Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 12 page Philips Semiconductors Product data MAX632x/MAX634x 3-pin ultra-low power SC70/SOT microprocessor reset circuit 2003 Aug 05 8 APPLICATION INFORMATION Interfacing to µPs with Bidirectional Reset Pins The MAX6328/MAX6348 RESET output is open drain and are easily interfaced with microprocessors which have bidirectional reset pins, such as the Motorola 68HC11. Directly connecting the MAX6328/MAX6348 RESET output to the µPs reset input and providing a pull-up resistor to VDD allows either device to independently assert reset (Figure 7). VDD VDD VDD GND GND RESET RESET SL01835 MAX6328/ MAX6348 MOTOROLA 68HCXX RPU Figure 7. Interfacing to µPs with Bidirectional Reset Pins Negative-going VDD transients The MAX6326-MAX6348 Series resets are relatively immune to short duration, negative-going VDD transients or power glitches. This capability greatly reduces false resets with short-duration pulses. Figure 8, Maximum Transient Duration versus Reset Comparator Overdrive, shows the maximum transient condition for which reset signal are not generated. The graph shows the maximum pulse width that a negative-going transient may have before it will generate a reset signal. Note: as the amplitude of the transient increases, the maximum allowable transient pulse width decreases. SL01836 RESET COMPARATOR OVERDRIVE, Vth – VCC (mV) 0 50 100 150 200 250 300 350 400 450 1 10 100 1000 MAX6326/MAX6327/ MAX6328 MAX6346/MAX6347/ MAX6348 Figure 8. Maximum transient duration without causing a reset pulse versus reset comparator overdrive. System configurations with various µPs The MAX326-MAX6348 Series resets provide a system solution for various µPs. Figures 9 and 10, respectively, reference the Philips µPs which are compatible with the MAX6326/MAX6346 and MAX6327/MAX6347 system resets. VDD VDD VDD GND GND RESET RESET SL01837 MAX6326/ MAX6346 µP(Note 1) NOTE: 1. Philips microprocessors with active-LOW resets: All 16-bit devices from XA-family (XA-Cxx, XA-Gxx, XA-Sxx, XA-Hxx), all LPC7xx devices (P87LPC760/761/762/767/768/769, P80C591/P87C591 (with on-chip CAN controller). Figure 9. µP System Diagram using MAX6326/MAX6328 Push-Pull, Active-LOW Resets VDD VDD VDD GND GND RESET RESET SL01838 MAX6327/ MAX6347 µP(Note 1) NOTE: 1. Philips microprocessors with active-HIGH resets : 8xC5x, 8xC3x, 8xC5xX2, 8xC3xX2, 8xC51Fx, 8xC51Rx+, 89C51Rx2, 89C66x, 8xC554, 8xC552, etc. Figure 10. µP System Diagram using MAX6327/MAX6347 Push-Pull, Active-HIGH Resets |
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