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MAX6314US41D3-T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6314US41D3-T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page 68HC11/Bidirectional-Compatible µP Reset Circuit 6 _______________________________________________________________________________________ MR has an internal 63k Ω pull-up resistor, so it can be left open if not used. Connect a normally open momen- tary switch from MR to GND to create a manual reset function; external debounce circuitry is not required. If MR is driven from long cables or if the device is used in a noisy environment, connecting a 0.1µF capacitor from MR to ground provides additional noise immunity. __________Applications Information 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 transients (glitches). The Typical Operating Character- istics show the Maximum Transient Duration vs. Reset Threshold Overdrive, for which reset pulses are not generated. The graph was produced using negative- going pulses, starting at VRST max and ending below the programmed reset threshold by the magnitude indicated (reset threshold overdrive). The graph shows the maximum pulse width that a negative-going VCC transient may typically have without causing a reset pulse to be issued. As the amplitude of the transient increases (i.e., goes farther below the reset threshold), the maximum allowable pulse width decreases. A 0.1µF bypass capacitor mounted close to VCC provides addi- tional transient immunity. Ensuring a Valid RESET Output Down to VCC = 0V When VCC falls below 1V, RESET no longer sinks current—it becomes an open circuit. Therefore, high- impedance CMOS-logic inputs connected to RESET can drift to undetermined voltages. This presents no problem in most applications, since most µP and other circuitry is inoperative with VCC below 1V. However, in applications where RESET must be valid down to VCC = 0V, adding a pull-down resistor to RESET will cause any stray leakage currents to flow to ground, holding RESET low (Figure 3). R1’s value is not critical; 100k Ω is large enough not to load RESET and small enough to pull RESET to ground. Figure 2. MAX6314 Supports Additional Devices on the Reset Bus 4.7k MR CIN RESET RESET CIRCUITRY VCC MAX6314 CSTRAY 68HC11 RESET CIRCUITRY CIN RESET VCC OTHER DEVICES CIN RESET Figure 3. RESET Valid to VCC = Ground Circuit MAX6314 VCC GND RESET R1 |
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