MIC2778-2YM5 TR

MICREL SEMICONDUCTOR  MIC2778-2YM5 TR  电压监控器, 低电平有效, 漏极开路复位, 1.5V-5.5V输入, SOT-23-5

The is a Voltage Monitor with adjustable hysteresis. The voltage monitor uniquely designed to detect two separate voltage thresholds, combined with a delay generator and logic. It is designed for monitoring the battery supply of portable digital systems, particularly PDAs, pagers and cellular telephones. High- and low-voltage thresholds can be adjusted independently, allowing for wide hysteresis. Voltage detection thresholds are accurate to 2%. If the battery voltage falls below the low-voltage threshold, the output RST is asserted and latched, preventing system operation until the battery is replaced or recharged. Internal logic prevents the output from chattering due to battery recovery or load removal. The output is asserted for 140ms minimum when a fresh battery is inserted. The IC"s power supply input is separate from the detector inputs, allowing the MIC2778 to be powered from a downstream supply, such a boost converter.

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Independently adjustable high- and low-voltage thresholds

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Internal logic prevents battery-voltage-fluctuation chatter

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Built in 140ms minimum delay deglitches output

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Extremely low 1µA typical supply current

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For applications not requiring built-in delay

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Immune to brief power supply transients