TPS3808G18DRVR

1 Features

• Power-On Reset Generator with Adjustable Delay Time: 1.25 ms to 10 s

• Very Low Quiescent Current: 2.4 μA Typical

• High Threshold Accuracy: 0.5% Typ

• Fixed Threshold Voltages for Standard Voltage Rails from 0.9 V to 5 V and Adjustable Voltage Down to 0.4 V Are Available

• Manual Reset ( MR) Input

• Open-Drain RESET Output

• Temperature Range: –40°C to 125°C

• Small SOT-23 and 2-mm × 2-mm WSON Packages

2 Applications

• DSP or Microcontroller Applications

• Notebook and Desktop Computers

• PDAs and Hand-Held Products

• Portable and Battery-Powered Products

• FPGA and ASIC Applications

3 Description

The TPS3808 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 useradjustable 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 wellsuited 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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