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IMP812TEUS-T Datasheet(PDF) 6 Page - IMP, Inc |
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IMP812TEUS-T Datasheet(HTML) 6 Page - IMP, Inc |
6 / 8 page IMP8 IMP81111, IMP8 , IMP81122 6 408-432-9100/www.impweb.com © 1999 IMP, Inc. RESET Output Operation In µP/µC systems it is important to have the processor begin operation from a known state or be able to return the system to a known state. A RESET output to a processor is provided to pre- vent improper operation during power supply sequencing or low voltage – brownout – conditions. The IMP811/812 are designed to monitor the system power sup- ply voltages and issue a RESET signal when levels are out of range. RESET outputs are guaranteed to be active for VCC above 1.1V. When VCC exceeds the reset threshold, an internal timer keeps RESET active for the reset timeout period, after which RESET becomes inactive (HIGH for the IMP811 and LOW for the IMP812). Valid Reset with VCC under 1.1V To ensure that logic inputs connected to the IMP811 RESET pin are in a known state when VCC is under 1.1V, a 100k Ω pull-down resistor at RESET is needed. The value is not critical. A similar pull-up resistor to VCC is needed with the IMP812. Negative VCC Transients Typically short duration transients of 100mV amplitude and 20µs duration do not cause a false RESET. A 0.1µF capacitor at VCC increases transient immunity. Power Supply IMP811 VCC GND RESET MR 100k 9 811/12_04.eps Power Supply IMP812 VCC GND RESET MR 100k Ω 811/12_05.eps Application Information Reset Threshold Suffix Voltage (V) L 4.63 M 4.38 J 4.00 T 3.08 S 2.93 R 2.63 Figure 2. RESET Valid with VCC Under 1.1V Figure 3. RESET Valid with VCC Under 1.1V If VCC drops below the reset threshold, RESET automatically becomes active. Alternatively, external circuitry or a human oper- ator can initiate this condition using the Manual Reset (MR) pin. There is an internal pullup on MR so it can be left open if it is not used. MR can be driven by TTL/CMOS logic or even an external switch, since it is already debounced. If the switch is at the end of a long cable, it might require a bypass (100nF) at the pin if noise pickup is a problem. Six voltage thresholds are available to support 3V and 5V systems: |
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