TPS3808

低静态电流可编程延迟监控电路 Low Quiescent Current, Programmable-Delay Supervisory Circuit

The family of microprocessor supervisory circuits monitors system voltages from 0.4 V to 5 V, asserting an open-drain RESET signal when the SENSE voltage drops below a preset threshold or when the manual reset MR pin drops to a logic low. The RESET output remains low for the user-adjustable delay time after the SENSE voltage and manual reset MR return above the respective thresholds.

The TPS3808 device uses a precision reference to achieve 0.5% threshold accuracy for VIT ≤ 3.3 V. The reset delay time can be set to 20 ms by disconnecting the CT pin, 300 ms by connecting the CT pin to VDD using a resistor, or can be user-adjusted between 1.25 ms and 10 s by connecting the CT pin to an external capacitor. The TPS3808 device has a very low typical quiescent current of 2.4 µA, so it is well-suited to battery-powered applications. It is available in the SOT-23 and 2-mm × 2-mm WSON packages, and is fully specified over a temperature range of –40°C to 125°C TJ.

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Power-On Reset Generator with Adjustable Delay

Time: 1.25 ms to 10 s

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Very Low Quiescent Current: 2.4 µA Typical

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High Threshold Accuracy: 0.5% Typ

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Fixed Threshold Voltages for Standard Voltage

Rails from 0.9 V to 5 V and Adjustable Voltage

Down to 0.4 V Are Available

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Manual Reset MR Input

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Open-Drain RESET Output

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Temperature Range: –40°C to 125°C

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Small SOT-23 and 2-mm × 2-mm WSON

Packages