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MAX821PUS-T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX821PUS-T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page Ensuring a Valid RESET Output Down to VCC = 0V When VCC falls below 1V, the MAX821 RESET output no longer sinks current—it becomes an open circuit. Therefore, high-impedance CMOS logic inputs con- nected to the RESET output can drift to undetermined voltages. This presents no problem in most applica- tions, since most µP and other circuitry is inoperative with VCC below 1V. However, in applications where the RESET output must be valid down to 0V, adding a pull- down resistor to the RESET pin will cause any stray leakage currents to flow to ground, holding RESET low (Figure 2a). R1’s value is not critical; 100k Ω is large enough not to load RESET, and small enough to pull RESET to ground. A 100k Ω pull-up resistor to VCC is also recommended for the MAX822 if RESET is required to remain valid for VCC < 1V (Figure 2b). Interfacing to µPs with Bidirectional Reset Pins µPs with bidirectional reset pins (such as the Motorola 68HC11 series) can contend with the MAX821 reset output. For example, if the MAX821 RESET output is asserted high and the µP wants to pull it low, indetermi- nate logic levels may result. To correct such cases, connect a 4.7k Ω resistor between the MAX821 RESET output and the µP reset I/O (Figure 3). Buffer the reset output to other system components. ___________________Chip Information TRANSISTOR COUNT: 492 4-Pin µP Voltage Monitors with Pin-Selectable Power-On Reset Timeout Delay 6 _______________________________________________________________________________________ 4.7k VCC GND RESET MAX821 RESET VCC GND µP BUFFER BUFFERED RESET TO OTHER SYSTEM COMPONENTS Figure 3. Interfacing to µPs with Bidirectional Reset I/O R1 VCC VCC GND MAX821 RESET R1 VCC VCC GND MAX822 RESET a) b) Figure 2. RESET/RESET Valid to VCC = Ground Circuit |
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