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ADM809JART-REEL-7 Datasheet(PDF) 7 Page - Analog Devices |
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ADM809JART-REEL-7 Datasheet(HTML) 7 Page - Analog Devices |
7 / 12 page REV. C ADM803/ADM809/ADM810 –7– ADM8_L/M/J 400 350 0 110 1000 100 300 250 50 200 150 100 ADM8_R/S/T/Z RESET COMPARATOR OVERDRIVE, VTH – VCC (mV) TPC 7. Maximum Transient Duration without Causing a Reset Pulse vs. Reset Comparator Overdrive INTERFACING TO OTHER DEVICES’ OUTPUT The ADM803/ADM809/ADM810 series is designed to integrate with as many devices as possible and, therefore, has a standard output dependent on VCC. This enables the part to be used in both 3 V and 5 V or any nominal voltage within the minimum and maximum specifications for VCC. Because of this design approach, interfacing this device to other devices is simplified. Ensuring a Valid Reset Output Down to VCC = 0 V When VCC falls below 0.8 V, the ADM803/ADM809’s RESET no longer sinks current. A high impedance CMOS logic input connected to RESET may, therefore, drift to undetermined logic levels. To eliminate this problem, a 100 k Ω resistor should be connected from RESET to ground. VCC VCC GND RESET ADM809 Figure 3. Ensuring a Valid Reset Output Down to VCC = 0 V Benefits of a Very Accurate Reset Threshold In other microprocessor supervisory circuits, tolerances in supply voltages lead to an overall increase in reset tolerance levels due to the deterioration of the microprocessor reset circuit’s power supply. The possibility of a malfunction during a power failure is greatly reduced because the ADM803/ADM809/ADM810 series can operate effectively even when there are large degradations of the supply voltages. Another advantage of the ADM803/ ADM809/ADM810 series is its very accurate internal voltage reference circuit. These benefits combine to produce an excep- tionally reliable voltage monitor circuit. Interfacing to Microprocessors with Multiple Interrupts In a number of cases, it is necessary to interface many interrupts from different devices (e.g., thermal, altitude, and velocity sensors). The ADM803/ADM809/ADM810 can easily be integrated into existing interrupt-handling circuits (Figure 4) or be used as a standalone device. PRIORITY ENCODER 74LS147 4-LINE BCD TO MICROPROCESSOR VCC ADM809 GND RESET OTHER SENSING DEVICES VCC Figure 4. Interfacing to Microprocessors with Multiple Interrupts |
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