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SGM809-JXN3 Datasheet(PDF) 7 Page - SG Micro Corp |
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SGM809-JXN3 Datasheet(HTML) 7 Page - SG Micro Corp |
7 / 9 page SGM803/809/810 7 APPLICATION NOTES BENEFITS OF AN 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 SGM803/ SGM809/SGM810 series can operate effectively even when there are large degradations of the supply voltages. Another advantage of the SGM803/ SGM809/SGM810 series is its very accurate internal voltage reference circuit. These benefits combine to produce an exceptionally 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 (for example, thermal, altitude, and velocity sensors). The SGM803/SGM809/SGM810 can easily be integrated into existing interrupt-handling circuits, as shown in Figure 1, or can be used as a standalone device. SGM809 GND RESET VCC VCC OTHER SENSING DEVICES PRIORITY ENCODER 74LS147 4-LINE BCD TO MICROPROCESSOR Figure 1. Interfacing to Microprocessors with Multiple Interrupts INTERFACING TO OTHER DEVICES’ OUTPUT The SGM803/SGM809/SGM810 series is designed to integrate with as many devices as possible and, therefore, has a standard output dependent on VCC. This enables the parts to be used in both 3 V and 5 V, or any nominal voltage within the minimum and maximum specifications for VCC. This design simplifies interfacing this device to other devices. ENSURING A VALID RESET OUTPUT DOWN TO VCC = 0 V When VCC falls below 1.0 V, the SGM803/SGM809 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 100kΩ resistor should be connected from RESET to ground. SGM809 GND RESET VCC VCC Figure 2. Ensuring a Valid Reset Output Down to VCC = 0V |
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Similar Description - SGM809-JXN3 |
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