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MAX6808XR46-T Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX6808XR46-T Datasheet(HTML) 4 Page - Maxim Integrated Products |
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4 / 9 page  Detailed Description Reset Output The MAX6806 voltage detector features an active-low, push-pull RESET output, while the MAX6807 features an active-high, push-pull RESET output. Unlike micropro- cessor (µP) supervisory circuits that offer a reset timeout period, the MAX6806 and MAX6807 RESET goes high and RESET goes low virtually immediately once VCC exceeds the reset threshold. If a brownout occurs (VCC falls below the reset threshold), RESET goes low and RESET goes high. RESET is guaranteed to be a logic low for VCC ≥ 1V and RESET is guaranteed to be a logic high for VCC ≥ 1.2V. The MAX6808 features an active-low, open-drain RESET output. The output sinks current when VCC falls below the reset threshold. Connect a pullup resistor from RESET to any supply voltage up to 6V (Figure 1). Select a resistor value large enough to provide a logic low and small enough to provide a logic high while supplying all input and leakage currents connected to the RESET line. A 100kW resistor is sufficient in applications driving high-impedance loads. The manual reset input (MR, 4-pin SOT143 package) can also initiate a reset (see Manual Reset Input section). Manual-Reset Input Many applications require manual-reset capabilities, allowing an operator, a test technician, or external logic circuitry to initiate a reset. A logic high on MR asserts a reset and remains asserted while MR is high. This input has an 80kW pulldown resistor, so the input can be left unconnected if not used. Connect a normally open momentary switch from MR to VCC to create a manu- al-reset function. 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 noise immunity. Hysteresis The MAX6806/MAX6807/MAX6808 feature internal hysteresis that creates two trip points: one for the rising supply voltage and one for the falling supply voltage (Figure 2). The hysteresis prevents the output from oscillating (chattering) when VCC is near the reset threshold. Reset Threshold Accuracy The MAX6806/MAX6807/MAX6808 are ideal for sys-tems using a 5V ±5%, 3V ±5%, or 2.5V ±5% power supply with ICs specified for 5V ±10%, 3V ±10%, or 2.5V ±10%, respectively. The reset is guaranteed to assert after the power supply falls out of regulation, but before power drops below the minimum specified oper-ating voltage range for the system ICs. Figure 2. Input and Output Waveforms with VCC Varied Figure 1. The MAX6808 Open-Drain RESET Output Allows Use with Multiple Supplies VTH+ HYST RESET (MAX6806/MAX6808) RESET (MAX6807) VHYST = VTH+ - VTH- VOH VOL VOH VOL VTH- MAX6808 VCC VCC GND +3.3V GND +5.0V 100kΩ 5V SYSTEM RESET www.maximintegrated.com Maxim Integrated │ 4 MAX6806/MAX6807/ MAX6808 Voltage Detectors |
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